JP2002295367A - Hermetic electric compressor - Google Patents

Abstract

(57) [Problem] To provide a hermetic electric compressor that can prevent a temperature of a stator winding from rising beforehand and can surely prevent demagnetization of a temperature of a permanent magnet. A closed electric compressor C includes a compression element (compressor) 3 and an electric element 3 for driving the compression element 3 in a closed container 1. The electric element 3 includes a stator 7 fixed to the closed casing 1 and having a stator winding 7, and a rotor 5 rotating within the stator 7. The rotor 5 includes a secondary conductor 5B provided around the rotor yoke 5A and a permanent magnet 31 embedded in the rotor yoke 5A. A temperature protection means (thermistor) 46 for cutting off the power supply to the electric element 3 due to a predetermined temperature rise is provided in the sealed container 1. The temperature protection means is attached to the stator winding 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor having a compression element and an electric element for driving the compression element in a closed container.

[0002]

2. Description of the Related Art Conventionally, as an electric motor for driving an air conditioner (air conditioner) or a hermetic electric compressor constituting a refrigerating cycle of a refrigerator (electric refrigerator), an induction synchronous motor driven by a commercial power supply has been used. And DC brushless electric motors were used. These motors are fixed in a closed container, and the motor is composed of a stator having a stator winding and a rotor rotating in the stator. Then, the induction synchronous motor rotates the rotor by induction by supplying AC commercial power to the stator winding.

By the way, as a main method of protecting the temperature of the stator winding constituting the induction synchronous motor of this type of hermetic type electric compressor, a thermostat wound around the stator winding is operated so that the induction synchronous motor is driven. When the temperature of the hermetic electric compressor exceeds the set value, the temperature sensor is attached to the outlet of the hermetic electric compressor, the piping on the suction side, or the outer surface of the hermetic container. By operating the protection switch, the power supply to the induction synchronous motor is cut off to protect the hermetic electric compressor.

[0004]

However, in the conventional hermetic electric compressor, when the stator winding temperature rises during overload operation to prevent stator winding burnout of the induction synchronous motor, By operating the thermostat wound on the stator winding, the power to the induction synchronous motor is cut off, and the discharge temperature installed in the discharge pipe is controlled by an expensive circuit element using a thermistor etc. When the temperature becomes higher than the reference, the power supply to the induction synchronous motor is cut off to protect the induction synchronous motor against abnormal temperature. In this case, the difference between the actual stator winding temperature and the discharge temperature fluctuates greatly depending on the load conditions and the like, so that the stator winding temperature actually exceeds the reference value and is operated. There is a problem that the service life is remarkably reduced, and there is also a problem that the stator winding is burned.

When the temperature of the induction synchronous motor rises, the permanent magnet embedded in the rotor yoke demagnetizes,
There is also a problem that the driving force of the induction synchronous motor is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and prevents the temperature of the stator winding from rising, and ensures that the temperature of the permanent magnet is demagnetized. It is an object of the present invention to provide a hermetically sealed electric compressor that can prevent the occurrence of such problems.

[0007]

That is, a hermetic electric compressor according to the present invention comprises a compression element and an electric element for driving the compression element in a closed container. It is fixed to a closed container, and includes a stator having a stator winding, and a rotor that rotates within the stator.
The rotor includes a secondary conductor provided around the rotor yoke, and a permanent magnet embedded in the rotor yoke. A temperature protection means for cutting off the power supply to the electric element is provided.

Further, in the hermetic electric compressor according to the second aspect of the present invention, in addition to the above, the temperature protection means is attached to the stator winding.

A hermetic electric compressor according to a third aspect of the present invention includes a hermetically sealed container including a compression element and an electric element for driving the compression element, wherein the electric element is mounted on the hermetic container. It is composed of a fixed stator having a stator winding, and a rotor that rotates within the stator. The rotor has a secondary conductor provided around the rotor yoke, A permanent magnet embedded in the rotor yoke, and a temperature protection means provided on an outer surface of the closed vessel for cutting off the power supply to the electric element due to a predetermined temperature rise.

According to a fourth aspect of the present invention, in addition to the first, second, or third aspect, the temperature protection means includes a thermistor having a resistance value that varies with temperature. The controller is configured by a controller that controls energization of the electric element based on a change in the resistance value of the thermistor.

Further, in the hermetic electric compressor according to a fifth aspect of the present invention, in addition to the first, second or third aspect, the temperature protection means comprises a bimetal switch. .

Further, in the hermetic electric compressor according to a sixth aspect of the present invention, in addition to the first, second or third aspect, the temperature protection means is constituted by a thermostat which opens and closes a contact according to a temperature. Is what it is.

A hermetic electric compressor according to a seventh aspect of the present invention is a hermetic electric compressor comprising a compression element and an electric element for driving the compression element in an airtight container. The rotor includes a stator fixed to the closed container and having a stator winding, and a rotor that rotates within the stator. The rotor is provided around a rotor yoke. The motor further includes a secondary conductor, a permanent magnet embedded in the rotor yoke, and an overload protection means for cutting off the current to the electric element by a predetermined overload current.

Further, in the hermetic electric compressor according to the invention of claim 8, in addition to claim 7, the overload protection means is constituted by an overload switch.

Furthermore, in the hermetic electric compressor according to the ninth aspect of the present invention, in addition to the seventh aspect, the overload protection means includes a current transformer for detecting a current flowing to the electric element, and a current transformer for detecting the current. And a controller that controls the energization of the electric element based on the output of the controller.

According to a tenth aspect of the present invention, in addition to the fourth or ninth aspect, the controller is further configured such that the controller is configured to control the controller so that after a predetermined time elapses after the temperature or current exceeds a predetermined value. This cuts off the power supply to the electric element.

Further, in the hermetic electric compressor according to an eleventh aspect of the present invention, in addition to the tenth aspect, the controller waits for a predetermined delay time to elapse after turning off the power to the electric element. This is to restore the power supply to the electric element.

According to the present invention, the hermetic electric compressor includes a compression element and an electric element for driving the compression element in a closed container, and the electric element is fixed to the closed container. , A stator having a stator winding, and a rotor that rotates within the stator. The rotor includes a secondary conductor provided around a rotor yoke, A permanent magnet embedded in a child yoke portion, and a temperature protection means for cutting off the power supply to the electric element by a predetermined temperature rise in the closed container. If the temperature protection means is attached to the stator winding as described above, when the temperature of the stator winding rises, it is possible to cut off the current supply to the electric element. This makes it possible to prevent the temperature of the permanent magnet embedded in the rotor yoke from being demagnetized due to a rise in the temperature of the electric element. Therefore, during operation of the hermetic electric compressor, the current to the stator winding can be cut off before the stator winding generates abnormal heat, so that the stator winding is damaged and the temperature of the permanent magnet is decreased. The driving force of the induction synchronous motor can be suitably maintained by reliably preventing magnetism, and the reliability of the electric element can be significantly improved.

According to the third aspect of the present invention, the hermetic electric compressor is provided with a compression element and an electric element for driving the compression element in the hermetic container. And a rotor having a stator winding, and a rotor that rotates within the stator. The rotor includes a secondary conductor provided around a rotor yoke. ,
A permanent magnet embedded in the rotor yoke, and a temperature protection means for cutting off the power to the electric element due to a predetermined temperature rise on the outer surface of the closed vessel. When the temperature of the outer surface of the closed container rises due to the heat generated by the elements, it is possible to cut off the current supply to the electric elements. This makes it possible to suppress a rise in the temperature of the sealed container. Therefore, it is possible to prevent an accident such as a fire due to a rise in the temperature of the sealed container.

According to a fourth aspect of the present invention, in addition to the first, second or third aspect of the present invention, the hermetic electric compressor further comprises a thermistor having a resistance value which varies with temperature. Since the controller is configured to control energization of the electric element based on a change in the resistance value of the thermistor, for example, when the temperature of the hermetic electric compressor rises and exceeds a preset temperature, the controller Thus, it is possible to control the energization of the electric element and to cut off the energization of the electric element. Thus, it is possible to control the energization supplied to the stator windings before the hermetic electric compressor is operated due to the overload and the hermetic electric compressor is damaged. Therefore, the temperature rise of the electric element can be reliably controlled by controlling the rotation of the electric element, so that the life of the electric element is extended and the reliability of the hermetic electric compressor can be significantly improved. is there.

According to the fifth aspect of the present invention, in the hermetic electric compressor, in addition to the first, second or third aspect, the temperature protection means is constituted by a bimetal switch. Even when the temperature of the hermetic electric compressor rises, it is possible to cut off the current supply to the electric element.
This eliminates the need to control and adjust the electric elements using expensive circuit elements. Therefore, it is possible to reliably and inexpensively prevent damage to the hermetic electric compressor due to temperature rise.

According to a sixth aspect of the present invention, in addition to the first, second or third aspect of the present invention, the hermetic electric compressor comprises a thermostat which opens and closes a contact according to temperature. Therefore, even when the temperature of the hermetic electric compressor rises, it is possible to cut off the current supply to the electric element. This eliminates the need to control and adjust the electric elements using expensive circuit elements. Therefore, it is possible to reliably and inexpensively prevent damage to the hermetic electric compressor due to temperature rise.

According to a seventh aspect of the present invention, a hermetic electric compressor includes a compression element and an electric element for driving the compression element in a closed container. It is fixed to a closed container, and includes a stator having a stator winding, and a rotor that rotates within the stator.
The rotor includes a secondary conductor provided around the rotor yoke, a permanent magnet embedded in the rotor yoke, and a predetermined overload current to the electric element. Since the overload protection means to cut off the electricity is provided,
It is possible to prevent and protect the temperature of the electric element from being raised by cutting off the power supply to the electric element during the overload operation of the hermetic electric compressor. Thus, damage to the electric element can be prevented beforehand, so that the life of the electric element can be greatly extended. Therefore, the reliability of the hermetic electric compressor can be significantly improved.

According to the eighth aspect of the present invention, in addition to the seventh aspect, the hermetic electric compressor has an overload switch, so that the overload protection means includes an overload switch. It is possible to prevent and protect the temperature of the electric element from being raised by cutting off the power supply to the electric element during the overload operation. Thus, damage to the electric element can be prevented beforehand, so that the life of the electric element can be greatly extended. Therefore, the reliability of the hermetic electric compressor can be significantly improved.

According to the ninth aspect of the present invention, in addition to the seventh aspect, the hermetic type electric compressor further comprises a current transformer for detecting a current supplied to the electric element,
Since the controller is configured to control the energization of the electric element based on the output of the current transformer, it is possible to interrupt the energization of the electric element by the controller during the overload operation of the hermetic electric compressor. It becomes possible. As a result, it is possible to prevent and protect the electric element from rising in temperature. Therefore, it is possible to reliably prevent the electric element from being damaged by the overload current.

According to a tenth aspect of the present invention, in addition to the fourth or ninth aspect, the hermetic electric compressor further comprises a controller which, after a predetermined time elapses after the temperature or the current exceeds a predetermined value. Since the energization of the electric element is cut off, it is possible to prevent the electric element from being damaged due to continuous temperature rise or current over due to overload operation of the hermetic electric compressor by the controller. Becomes As a result, damage to the electric element can be prevented beforehand, so that the life of the electric element can be greatly extended. Therefore, the reliability of the hermetic electric compressor can be significantly improved.

The hermetic electric compressor according to claim 11 is
In addition to claim 10, the controller waits for a predetermined delay time to elapse after turning off the power to the electric element,
Since the energization of the electric element is restored, there is always a delay time between the interruption of the energization of the electric element and the energization of the electric element next time. Thus, for example, it is possible to prevent the rotor from becoming hot due to frequent repetition of energization and disconnection of the electric element. Therefore, the permanent magnet embedded in the rotor can be prevented from being demagnetized by heat.

[0028]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an example of a vertical sectional side view of a hermetic electric compressor C to which an induction synchronous motor 2 according to the present invention is applied. In the figure, reference numeral 1 denotes a closed container, and an electric element
On the lower side, a compression element that is driven to rotate by the electric element is housed. The airtight container 1 has a two-part structure including a cylindrical shell portion 1A having an open upper end and an end cap portion 1B for closing an upper end opening of the shell portion 1A. (Hereinafter referred to as the induction synchronous motor 2 and the compressor 3), the end cap portion 1B is put on the shell portion 1A, and sealed by high frequency welding or the like. Incidentally, examples of the hermetic electric compressor C include a rotary, reciprocating, scroll compressor and the like.

The induction synchronous motor 2 is composed of a single-phase two-pole, and is fixed to the inner wall of the closed casing 1. The stator 4 is rotatably supported inside the stator 4 about a rotation shaft 6. And a rotator 5 formed. The stator 4 includes a stator winding 7 that applies a rotating magnetic field to the rotor 5.

The compressor 3 is provided with a first partitioning device which is divided by an intermediate partitioning plate 8.
And a second rotary cylinder 10. Eccentric portions 11 and 12 that are driven to rotate by the rotating shaft 6 are attached to the cylinders 9 and 10, respectively.
80 degrees out of phase.

Reference numerals 13 and 14 denote a first roller and a second roller which rotate in the cylinders 9 and 10, respectively, and rotate in the cylinder by rotation of the eccentric portions 11 and 12, respectively. 1
Reference numerals 5 and 16 denote a first frame and a second frame, respectively. The first frame 15 forms a closed compression space of the cylinder 9 between the first frame 15 and the intermediate partition plate 8. Similarly, a closed compression space of the cylinder 10 is formed between the cylinder 16 and the intermediate partition plate 8. In addition, the first frame 15 and the second frame 16 each support the lower part of the rotary shaft 6 so as to be rotatable.
7 and 18 are provided.

Reference numerals 19 and 20 denote discharge mufflers, which are attached so as to cover the first frame 15 and the second frame 16, respectively. The cylinder 9 and the discharge muffler 19 communicate with each other via a discharge hole (not shown) provided in the first frame 15, and the cylinder 10 and the discharge muffler 20 also communicate with a discharge not shown (not shown) provided in the second frame 16. It is connected by a hole. Reference numeral 21 denotes a bypass pipe provided outside the sealed container 1 and communicates with the inside of the discharge muffler 20.

Reference numeral 22 denotes a discharge pipe provided on the closed container 1, and reference numerals 23 and 24 denote cylinders 9, 10 respectively.
It is a suction pipe that leads to Reference numeral 25 denotes a sealed terminal, which is attached to the end face side of the sealed container 1
To supply electric power to the stator winding 7 of the stator 4 from the outside (not shown are lead wires connecting the sealed terminal 25 and the stator winding 7). Reference numeral 60 denotes a balancer for improving the rotational balance of the rotor 5.

Reference numeral 26 denotes a rotor core, which is formed by laminating a plurality of rotor iron plates (not shown) formed by punching electromagnetic steel plates having a thickness of 0.3 mm to 0.7 mm into a predetermined shape, and caulking each other to form an integral unit. (In addition, it may be integrated by welding without depending on caulking). 66, 67 are end face members attached to the upper and lower ends of the rotor core 26, respectively. The end face members 66 and 67 are made of a flat plate made of a non-magnetic material such as stainless steel, aluminum, copper, brass and the like.
When a magnetic material is used for the end face members 66 and 67, the end face members 66 and 67 serve as a magnetic path, causing a magnet of the rotor 5 to cause a magnetic short circuit and deteriorating the operation performance of the induction synchronous motor 2.

FIG. 2 is a plan view of the hermetic electric compressor C in which the hermetic container 1 is divided into two parts, FIG. 3 is a cross-sectional top view of the hermetic electric compressor C, FIG. Is a side view of the rotor 5. FIG. A stator winding 7 is wound around the stator 4,
The lead wire 50 connected to the stator winding 7 and the coil end of the stator winding 7 are together
0, and the lead wire 50 is connected to the sealed terminal 25.

The rotor 5 includes a rotor yoke portion 5A made of a ferromagnetic material, and a cage-shaped secondary conductor 5B which is positioned around the rotor yoke portion 5A and is die-cast. The other end ring 69 which is located at the periphery of both end surfaces of the rotor yoke portion 5A and protrudes in a ring shape by a predetermined size, and which is die-cast integrally with the cage-shaped secondary conductor 5B; And a permanent magnet 31 embedded in the iron portion 5A. The permanent magnet 31 is magnetized after a permanent magnet material is inserted into a slot 44 described later. The permanent magnets 31 (31SA, 31SB) embedded on one side (for example, the right side in the figure) of the rotating shaft 6 have the same S pole, and the permanent magnets 31 embedded on the other side (the left side in the figure).
(31NA, 31NB) are the same N pole.

A plurality of cage-shaped secondary conductors 5B are provided around the rotor yoke portion 5A, and are formed in a cage shape (not shown) in a cage shape along the extending direction of the rotating shaft 6. Aluminum die casting is injection molded. The basket-shaped secondary conductor 5B is formed in a so-called skewed structure that is spirally inclined at a predetermined angle in the circumferential direction of the rotating shaft 6 from one end to the other end (FIG. 5).

A plurality of slots 44 (four in the present embodiment) are formed in the rotor yoke portion 5A so as to penetrate in the vertical direction and open at both ends. Each is closed at 67 (FIG. 6). Then, the cage-shaped secondary conductor 5B and the end ring 6
8, 69 at the time of die casting molding, one end face member 67,
One end ring 69 is fixed to the rotor yoke 5A. Further, the other end member 66 is fixed to the rotor yoke 5A with a plurality of rivets 66A.

In this case, after the magnet material of the unmagnetized permanent magnet 31 is inserted from the opening of the slot 44, the opening is closed by the other end member 66, and the end member 66 is connected to the rivets 66A. Thus, the magnet material is fixed in each of the slots 44 by caulking and fixing to an engaging hole 5C provided in the rotor yoke portion 5A. by this,
The two end face members 66 and 67 are fixed to both ends of the rotor yoke 5A, and the permanent magnets 31 are fixed in the slots 44. The permanent magnet 31 is made of a rare earth permanent magnet material such as a praseodymium permanent magnet or a neodymium permanent magnet whose surface is plated with nickel or the like, and has a strong magnetic force. The permanent magnets 31, 31 are provided so as to face the rotating shaft 6, and the facing permanent magnets 31, 3
1 are embedded with different magnetic poles (FIG. 7).

The permanent magnets 31SA and 31SB embedded on one side (for example, the right and upper sides in the figure) of the rotating shaft 6 are the same S pole, and the permanent magnets embedded on the other side (the left and lower sides in the figure). 31NA and 31NB have the same N pole. That is, the permanent magnets 31SA and 31SB, and the permanent magnets 31NA and 31NB are arranged in a substantially rectangular shape with the rotation shaft 6 as the center, and have two different S poles and two different N poles toward the outside of the rotation shaft 6 in the circumferential direction. It is embedded in a polar configuration, and is configured so that a rotational force can be applied to the rotor 5 by the magnetic force of a main winding 7A and an auxiliary winding 7B described later. The arrangement of the permanent magnet 31 shown in FIGS. 6 and 7 is different from the arrangement of the permanent magnet 31 shown in FIGS. 2, 3 and 4. However, the arrangement of the permanent magnet 31 shown in FIGS. The arrangement may be as shown in FIGS. 2, 3, and 4. Further, the permanent magnets 31 shown in FIGS. 2, 3 and 4 may be arranged as shown in FIGS. 6 and 7.

An air conditioner using such a hermetic electric compressor C equipped with the induction synchronous motor 2 or a refrigerant circuit such as an electric refrigerator (FIG. 8) is used for indoor air conditioning and refrigerator storage. The inside is cooled. That is, when the compressor 3 of the hermetic electric compressor C is driven, the refrigerant sealed in the refrigerant circuit is sucked from the suction pipe 23 and transferred to the first rotary cylinder 9 and the second rotary cylinder 10. Then, it is compressed and discharged from the discharge pipe 22 to the pipe 27. The compressed gas refrigerant discharged to the pipe 27 is
(Condenser), in which heat is dissipated and condensed to become a liquid refrigerant and flow into a receiver (receiver tank) 29.

The liquid refrigerant which flows into the liquid receiver 29 and is temporarily stored therein is throttled by the temperature automatic expansion valve 37 from the pipe 29A on the outlet side of the liquid receiver 29 via the dryer 30, the moisture indicator 35 and the solenoid valve 36. After that, it flows into an evaporator 38 (evaporator) where it is evaporated and vaporized. At that time, the refrigerant exerts a cooling action by absorbing heat from the surroundings and almost liquefies. After that, the refrigerant flows into the accumulator 39 from the pipe 38A on the outlet side of the evaporator 38, where the refrigerant is separated into gas and liquid and then checked. The refrigeration cycle sucked into the compressor 3 again through the valve 40 is repeated.

The liquid refrigerant flowing out of the liquid receiver 29 is supplied to a pipe 29A.
From the evaporator 38 via a capillary tube 41, a high / low pressure switch 42, and a capillary tube 43.
And an accumulator 39 are connected to a pipe 38A. The high / low pressure switch 42 detects the pressure between the pipes 29A and 38A via the capillary tubes 41 and 43, and the pressure between the pipes 29A and 38A becomes equal to or greater than a predetermined pressure difference, and is sucked into the hermetic electric compressor C. When the amount of the refrigerant to be supplied is insufficient, the liquid refrigerant from the liquid receiver 29 flows into the compressor 3 and is protected. The automatic temperature expansion valve 37 automatically adjusts the opening based on the temperature detected by the temperature-sensitive cylinder 34 provided on the outlet side of the evaporator 38.

The hermetic type electric compressor C has a thermistor 46 as a temperature protection means whose resistance value changes with temperature.
Is provided. The thermistor 46 is attached to the stator winding 7 provided in the closed casing 1 of the hermetic electric compressor C, and the thermistor 46 is fixed to the stator by a polyester thread 70 that binds the coil ends of the stator winding 7. It is fixed to the winding 7. The thermistor 46 is a closed container 1
Is connected to the connection terminal 71 provided on the end cap portion 1B by a lead wire 72 (FIG. 9).

FIG. 10 shows an electric circuit diagram of the induction synchronous motor 2. In FIG. 10, induction synchronous motor 2 supplied with electric power from single-phase AC commercial power supply AC has main winding 7A.
And an auxiliary winding 7B.
Main winding 7A connected to one side of single-phase AC commercial power supply AC is connected to the other of single-phase AC commercial power supply AC. Also,
Auxiliary winding 7B connected to one side of single-phase AC commercial power supply AC
Is a single-phase AC commercial power supply AC
Connected to the other.

The auxiliary winding 7B is connected to the contact 61 of the starting relay 61.
B, and the other end of the single-phase AC commercial power supply AC via the starting capacitors 48, 48. These contacts 61B and the starting capacitors 48, 48 are connected in series, and
1B, an operating capacitor 47 is connected in parallel with the starting capacitors 48,48. The operation capacitor 47 is set to a capacity suitable for steady operation, and in a state where the operation capacitor 47 and the starting capacitors 48, 48 are connected in parallel,
The capacitors 47, 48, and 48 are set to have a capacity suitable for starting. 48A, 48A are discharge resistors for discharging the current charged in the starting capacitors 48, 48, 61A is a starting relay coil, and PWS is a power switch.

The power switch PSW and the stator winding 7
Between the single-phase AC commercial power supply AC and the stator winding 7
Relay 49 having a control relay contact 49B for supplying power to the
Is provided. A controller 62 controls the energization of the induction synchronous motor 2 based on a change in the resistance value of the thermistor 46.
And connected to the control relay coil 49A of the control relay 49. The controller 62 has a single-phase AC commercial power supply AC.
And a current-sensitive line current detector 63 is connected as an overload protection means for detecting a line current.

When the power switch PWS is turned on with the control relay contact 49B closed, current flows from the single-phase AC commercial power supply AC to the main winding 7A and the auxiliary winding 7B. When the induction synchronous motor 2 is started at the beginning, a current flows through the starting relay coil 61A to close the contact 61B, and the auxiliary winding 7B is connected to the operating capacitor 47 connected in parallel, the starting capacitors 48 and 48 and the current between the main winding 7A. The induction synchronous motor 2 starts the starting operation by obtaining the starting torque based on the phase difference.
Then, when the induction synchronous motor 2 starts rotating due to the energization, the contact 61B is opened and the starting capacitor 4
8 and 48 are separated and the induction synchronous motor 2 is driven by the current phase difference between the main winding 7A and the auxiliary winding 7B by the operation capacitor 47.
Continue the steady operation. The hermetic electric compressor C is operated by the rotation of the induction synchronous motor 2, and air conditioning in the room is performed by the air conditioner, and the inside of the refrigerator is cooled.

When the hermetic electric compressor C is operated, the temperature of the compressor 3 rises to a high temperature. When the temperature of the compressor 3 becomes high, the temperature of the stator winding 7 also rises, whereby the resistance value of the thermistor 46 changes, and the temperature rise of the stator winding 7 is detected, and the detected temperature becomes higher than a preset temperature. If the temperature is high, the controller 62 detects that the temperature of the stator winding 7 is higher than the set temperature, passes a current to the control relay coil 49A, opens the control relay contact 49B, and cuts off the current supply to the stator winding 7. As a result, it is possible to cut off the current to the stator winding 7 before the stator winding 7 generates abnormal heat during the operation of the hermetic electric compressor C, and damage to the stator winding 7 and the permanent magnet It is possible to reliably prevent the temperature demagnetization of 31. When the controller 62 detects that the temperature of the stator winding 7 is higher than the set temperature, it supplies a current to the control relay coil 49A to open the control relay contact 49B and cut off the current to the stator winding 7. However, the present invention is not limited to this. When the temperature of the hermetic electric compressor C rises and exceeds a preset temperature, the controller 62 controls the energization of the induction synchronous motor 2 to reduce the rotation speed, Alternatively, the power supply to the induction synchronous motor 2 may be cut off.

When a large current flows through the stator winding 7 due to an overload operation of the hermetic electric compressor C or the like, the line current detector 63 detects it, and the detected current is set to a preset current. If it is larger, the controller 62 detects that a large current has flowed through the stator winding 7 and supplies a current to the control relay coil 49A to open the control relay contact 49B and cut off the current supply to the stator winding 7. . by this,
Before the operation of the hermetic electric compressor C due to an overload is performed and the hermetic electric compressor C is damaged, the power supply to the stator winding 7 is cut off to protect the induction synchronous motor 2. It is possible to do. The controller 62 protects the induction synchronous motor 2 by cutting off the current to the stator winding 7 based on the signal detected by either the thermistor 46 or the line current detector 63 first.

Next, FIG. 11 is a longitudinal sectional side view of a part (in the vicinity of the end cap portion 1B) of another hermetic electric compressor C. In FIG. 11, the hermetic electric compressor C is provided with a bimetal switch 64 for opening and closing a contact at a predetermined temperature as a temperature protection means. The bimetal switch 64 is fixed to the stator winding 7 with a polyester thread 70 binding the coil ends of the stator winding 7. Further, the bimetal switch 64 is connected between the sealed terminal 25 provided on the end cap portion 1B of the sealed container 1 and the stator winding 7, and when the temperature of the stator winding 7 becomes higher than a predetermined temperature, the contact is closed. 61B is opened to cut off the current supply from the single-phase AC commercial power supply AC to the stator winding 7.

FIG. 12 is an electric circuit diagram of the induction synchronous motor 2 of the hermetic electric compressor C shown in FIG. Figure 1
2, an induction synchronous motor 2 supplied with power from a single-phase AC commercial power supply AC via a bimetal switch 64 includes a stator winding 7 including a main winding 7A and an auxiliary winding 7B. Main winding 7 connected to one side of AC
A is connected to the other of the single-phase AC commercial power supply AC. The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC is connected to the other side of the single-phase AC commercial power supply AC via the operation capacitor 47.

The auxiliary winding 7B is connected to the contact 61 of the starting relay 61.
B, and the other end of the single-phase AC commercial power supply AC via the starting capacitors 48, 48. These contacts 61B and the starting capacitors 48, 48 are connected in series, and
1B, an operating capacitor 47 is connected in parallel with the starting capacitors 48,48. The operation capacitor 47 is set to a capacity suitable for steady operation, and in a state where the operation capacitor 47 and the starting capacitors 48, 48 are connected in parallel,
The capacitors 47, 48, and 48 are set to have a capacity suitable for starting. 48A, 48A are discharge resistors for discharging the current charged in the starting capacitors 48, 48, and 61A is a starting relay coil.

When the power switch PSW is turned on, a current flows from the single-phase AC commercial power supply AC to the main winding 7A and the auxiliary winding 7B. When the induction synchronous motor 2 is started at the beginning, a current flows through the starting relay coil 61A to close the contact 61B, and the auxiliary winding 7B is connected to the operating capacitor 4 connected in parallel.
7. The starting synchronous motor 2 starts the starting operation by obtaining the starting torque by the current phase difference between the starting capacitors 48, 48 and the main winding 7A. Then, when the induction synchronous motor 2 starts rotating due to the energization, the contact 61B is opened to disconnect the starting capacitors 48, 48, and the induction capacitor is separated by the operation capacitor 47 due to the current phase difference between the main winding 7A and the auxiliary winding 7B. The electric motor 2 continues the steady operation. The induction synchronous motor 2
, The hermetic electric compressor C is operated, and the air conditioner performs air conditioning in the room. In the refrigerator, the inside of the refrigerator is cooled.

When the hermetic electric compressor C is operated, the temperature of the compressor 3 rises to a high temperature. When the temperature of the compressor 3 rises, the temperature of the stator winding 7 also rises, and the bimetal switch 64 detects the temperature of the stator winding 7. If the detected temperature is higher than a preset temperature, the bimetal switch 64 turns on the contact. To shut off the current supply to the stator winding 7.
As a result, during operation of the hermetic electric compressor C, it is possible to cut off the power supply to the stator winding 7 before the stator winding 7 generates abnormal heat, and damage to the stator winding 7 and permanent Magnet 3
1 can be reliably prevented from being demagnetized, and the hermetic electric compressor C can be protected from being damaged by abnormal heat generation.

Next, FIG. 13 is a vertical sectional side view of a part of the other hermetic electric compressor C (near the end cap portion 1B). In FIG. 13, the hermetic electric compressor C is provided with a bimetal switch 64 for opening and closing the contact at a predetermined temperature as described above as a temperature protection means. The bimetal switch 64 is directly connected to the sealed terminal 25 extending into the sealed container 1, and the bimetal switch 64 is connected between the sealed terminal 25 provided on the end cap portion 1 </ b> B of the sealed container 1 and the stator winding 7. When the temperature is higher than the predetermined temperature, the contact is opened to cut off the power supply from the single-phase AC commercial power supply AC to the stator winding 7. The electric circuit diagram of the hermetic electric compressor C is the same as in FIG.

When the power switch PSW is turned on, a current flows from the single-phase AC commercial power supply AC to the main winding 7A and the auxiliary winding 7B. When the induction synchronous motor 2 is started at the beginning, a current flows through the starting relay coil 61A to close the contact 61B, and the auxiliary winding 7B is connected to the operating capacitor 4 connected in parallel.
7. The starting synchronous motor 2 starts the starting operation by obtaining the starting torque by the current phase difference between the starting capacitors 48, 48 and the main winding 7A. Then, when the induction synchronous motor 2 starts rotating due to the energization, the contact 61B is opened to disconnect the starting capacitors 48, 48, and the induction capacitor is separated by the operation capacitor 47 due to the current phase difference between the main winding 7A and the auxiliary winding 7B. The electric motor 2 continues the steady operation. The induction synchronous motor 2
, The hermetic electric compressor C is operated, and the air conditioner performs air conditioning in the room. In the refrigerator, the inside of the refrigerator is cooled.

When the hermetic electric compressor C is operated, the temperature of the compressor 3 rises to a high temperature. When the temperature of the compressor 3 becomes high, the temperature of the stator winding 7 also rises and the end cap 1
The temperature inside B also rises. When the temperature inside the end cap portion 1B rises, the bimetal switch 64 detects the temperature. When the detected temperature inside the end cap portion 1B is higher than the set temperature, the contact is opened to cut off the current supply to the stator winding 7. . As a result, power supply to the stator winding 7 can be cut off before the stator 4 or the stator winding 7 generates abnormal heat during operation of the hermetic electric compressor C, and the stator winding 7
Of the permanent magnet 31 and demagnetization of the temperature of the permanent magnet 31 can be reliably prevented, and the hermetic electric compressor C can be protected from being damaged by abnormal heat generation.

Next, FIG. 14 shows a longitudinal sectional side view of a part (near the end cap portion 1B) of another hermetic electric compressor C. In FIG. 14, the hermetic electric compressor C is provided with a thermostat 65 that opens and closes contacts at a predetermined temperature as temperature protection means. The thermostat 65 is connected to a connection terminal 71 provided on the end cap portion 1B of the sealed container 1 by a lead wire 72. When the temperature inside the sealed container 1 is higher than a predetermined temperature, the contact is opened to open the single-phase AC commercial power supply. The current supply from the AC to the stator winding 7 is cut off.

FIG. 15 is an electric circuit diagram of the induction synchronous motor 2 of the hermetic electric compressor C shown in FIG. Figure 1
In FIG. 5, reference numeral 65 denotes a thermostat, which has the same configuration as that of FIG. When the power switch PWS is turned on with the control relay contact 49B closed,
Main winding 7A and auxiliary winding 7B from single-phase AC commercial power supply AC
Current flows through When the induction synchronous motor 2 is started at the beginning, a current flows through the starting relay coil 61A to close the contact 61B,
The auxiliary winding 7B is connected to an operation capacitor 47 connected in parallel,
Starting torque is obtained from the current phase difference between the starting capacitors 48, 48 and the main winding 7A, and the induction synchronous motor 2 starts the starting operation. Then, when the induction synchronous motor 2 starts rotating due to the energization, the contact 61B is opened to disconnect the starting capacitors 48, 48, and the induction capacitor is separated by the operation capacitor 47 due to the current phase difference between the main winding 7A and the auxiliary winding 7B. The electric motor 2 continues the steady operation. The hermetic electric compressor C is operated by the rotation of the induction synchronous motor 2, and the air conditioner performs indoor air conditioning. In the refrigerator, the inside of the refrigerator is cooled.

When the hermetic electric compressor C is operated, the temperature of the compressor 3 rises to a high temperature. When the temperature of the compressor 3 becomes high, the temperature inside the end cap portion 1B also rises, whereby the thermostat 65 detects the temperature inside the end cap portion 1B, and closes the contact when the detected temperature is higher than a preset temperature. When the contact of the thermostat 65 is closed, the controller 62 supplies a current to the control relay coil 49A to open the control relay contact 49B and open the stator winding 7.
Cut off the power supply to. Thus, the hermetic electric compressor C
During the operation, the current to the stator winding 7 can be cut off before the inside of the end cap portion 1B generates abnormal heat, and the damage to the stator winding 7 and the temperature demagnetization of the permanent magnet 31 can be reliably prevented. This can be prevented.

When a large current flows to the stator winding 7 due to an overload operation of the hermetic electric compressor C or the like, the line current detector 63 detects it, and the detected current is set to a preset current. If it is larger, the controller 62 detects that a large current has flowed to the stator winding 7 and flows a current to the control relay coil 49A, and opens the control relay contact 49B to cut off the current to the stator winding 7. . by this,
Before the operation of the hermetic electric compressor C due to overload is performed and the hermetic electric compressor C is damaged, it is possible to protect the induction synchronous motor 2 by cutting off the current supply to the stator winding 7. It becomes possible. The controller 62 protects the induction synchronous motor 2 by cutting off the current to the stator winding 7 by a signal detected by either the thermostat 65 or the line current detector 63 first.

Next, FIG. 16 is a vertical sectional side view of a part (in the vicinity of the end cap portion 1B) of another hermetic electric compressor C. In FIG. 16, the hermetic electric compressor C is provided with a thermostat 65 whose resistance value changes with temperature. The thermostat 65 is fixed to the stator winding 7 with a polyester thread 70 binding the coil end of the stator winding 7, and the thermostat 65 is connected to a connection terminal 71 provided on the end cap portion 1 </ b> B of the sealed container 1. They are connected by a lead wire 72.

FIG. 17 is an electric circuit diagram of the induction synchronous motor 2 of the hermetic electric compressor C shown in FIG. Figure 1
7, an induction synchronous motor 2 supplied with electric power from a single-phase AC commercial power supply AC includes a stator winding 7 including a main winding 7A and an auxiliary winding 7B. One of the main windings 7A is connected, and the other of the main windings 7A is connected to the other of the single-phase AC commercial power supply AC.
The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC is connected to the other side of the single-phase AC commercial power supply AC via the operation capacitor 47.

The auxiliary winding 7B is connected to the contact 61 of the starting relay 61.
B, and the other end of the single-phase AC commercial power supply AC via the starting capacitors 48, 48. These contacts 61B and the starting capacitors 48, 48 are connected in series, and
1B, an operating capacitor 47 is connected in parallel with the starting capacitors 48,48. The operation capacitor 47 is set to a capacity suitable for steady operation, and in a state where the operation capacitor 47 and the starting capacitors 48, 48 are connected in parallel,
The capacitors 47, 48, and 48 are set to have a capacity suitable for starting. 48A, 48A are discharge resistors for discharging the current charged in the starting capacitors 48, 48, 61A is a starting relay coil, and PWS is a power switch.

The power switch PSW and the stator winding 7
Between the single-phase AC commercial power supply AC and the stator winding 7
And a control relay 49 also serving as a protection switch for shutting off the power supply to the stator winding 7 while supplying power to the stator winding 7. One of the thermostats 65 fixed to the stator winding 7 is connected to the control relay coil 4 of the control relay 49.
9A, connected to one side of a single-phase AC commercial power supply AC via an overload switch 73 as overload protection means,
The other end of the thermostat 65 is connected to the other end of the single-phase AC commercial power supply AC. Reference numeral 49B denotes a switch contact. When a predetermined overload current flows through the overload switch 73, a current flows through the control relay coil 49A to open the control relay contact 49.

When the power switch PWS is turned on with the control relay contact 49B closed, the main winding 7A and the auxiliary winding are supplied from the single-phase AC commercial power supply AC via the overload switch 73 and the control relay contact 49B. A current flows through 7B. When the induction synchronous motor 2 is started at the beginning, a current flows through the starting relay coil 61A to close the contact 61B, and the auxiliary winding 7B is connected to the operating capacitor 47 connected in parallel, the starting capacitors 48 and 48 and the current between the main winding 7A. The induction synchronous motor 2 starts the starting operation by obtaining the starting torque based on the phase difference. Then, when the induction synchronous motor 2 starts rotating due to the energization, the contact 61B is opened to disconnect the starting capacitors 48, 48, and the induction capacitor is separated by the operation capacitor 47 due to the current phase difference between the main winding 7A and the auxiliary winding 7B. The electric motor 2 continues the steady operation. The hermetic electric compressor C is operated by the rotation of the induction synchronous motor 2, and the air conditioner performs indoor air conditioning. In the refrigerator, the inside of the refrigerator is cooled.

When the hermetic electric compressor C is operated, the temperature of the compressor 3 rises to a high temperature. When the temperature of the compressor 3 becomes high, the temperature of the stator winding 7 also rises and the thermostat 65
Detects the temperature and closes the contact when the detected temperature is higher than a preset temperature. As a result, a current flows through the control relay coil 49A and the control relay contact 49B
Opens to cut off the current supply to the stator winding 7. This allows
During the operation of the hermetic electric compressor C, the power supply to the stator winding 7 can be cut off before the inside of the end cap portion 1B generates abnormal heat, and damage to the stator winding 7 and the permanent magnet 31
Temperature demagnetization can be reliably prevented.

When an overload current flows to the stator winding 7 due to an overload operation of the hermetic electric compressor C or the like, the overload switch 73 detects the overload current, and the detected current is set to a preset current. If it is larger, the overload switch 73 supplies a current to the control relay coil 49A to open the control relay contact 49B and cut off the current supply to the stator winding 7. As a result, before the hermetic electric compressor C is operated due to overload and the hermetic electric compressor C is damaged, energization of the stator winding 7 is cut off to protect the induction synchronous motor 2. It is possible to do. Note that either the thermostat 65 or the overload switch 73 cuts off the current to the stator winding 7 by a signal detected first to protect the induction synchronous motor 2.

FIG. 18 is a longitudinal sectional side view of a part of the other hermetic electric compressor C (in the vicinity of the end cap 1B). In FIG. 18, the hermetic electric compressor C is provided with an overload switch 73 as overload protection means, and this overload switch 73 is fixed to the end cap portion 1B of the closed casing 1. That is, the overload switch 73 is fixed to the sealed terminal 25 side which is the end face side of the sealed container 1, and when a predetermined overload current flows, a contact (not shown) is opened to cut off the current supply to the stator winding 7. I do. Reference numeral 74 denotes a cover for protecting the sealed terminal 25 and the overload switch 73;
Is a nut for fixing the cover 74.

FIG. 19 is an electric circuit diagram of the induction synchronous motor 2 of the hermetic electric compressor C shown in FIG. Figure 1
9, the induction synchronous motor 2 supplied with power from the single-phase AC commercial power supply AC via the overload switch 73
Has a stator winding 7 composed of a main winding 7A and an auxiliary winding 7B, and a main winding 7A connected to one of the single-phase AC commercial power supplies AC is connected to the other of the single-phase AC commercial power supply AC. I have.
The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC is connected to the other side of the single-phase AC commercial power supply AC via the operation capacitor 47.

The auxiliary winding 7B is connected to the other end of the single-phase AC commercial power supply AC via the contact 61B of the starting relay 61 and the starting capacitor 48, and these contacts 61B and the starting capacitor 48 are connected in series. , Contact 61B,
An operating capacitor 47 is connected in parallel with the starting capacitor 48. The operating capacitor 47 is set to a capacity suitable for steady operation, and the capacitors 47 and 48 are set to a capacity suitable for starting in a state where the operating capacitor 47 and the starting capacitor 48 are connected in parallel. still,
48A is a discharge resistor for discharging the current charged in the starting capacitor 48, 61A is a starting relay coil, PSW
Is a power switch.

When the power switch PSW is turned on, a current flows from the single-phase AC commercial power supply AC to the main winding 7A and the auxiliary winding 7B via the overload switch 73. At the beginning of the start of the induction synchronous motor 2, a current flows through the starting relay coil 61A to close the contact 61B, and the auxiliary winding 7B
The starting synchronous motor 2 starts the starting operation by obtaining the starting torque by the current phase difference between the operating capacitor 47, the starting capacitor 48 and the main winding 7A connected in parallel. Then, when the induction synchronous motor 2 starts rotating due to the energization, the contact 61B is opened to disconnect the starting capacitor 48, and the main winding 7A and the auxiliary winding 7B of the operating capacitor 47 are separated.
With the current phase difference of, the induction synchronous motor 2 continues the steady operation. The hermetic electric compressor C is operated by the rotation of the induction synchronous motor 2, and the air conditioner performs indoor air conditioning. In the refrigerator, the inside of the refrigerator is cooled.

When an overload current flows through the stator winding 7 due to an overload operation of the hermetic electric compressor C,
The overload switch 73 detects this, and if the detected current is larger than a preset current, the overload switch 73 opens a contact to cut off the current supply to the stator winding 7. That is, when an overload current flows through the stator winding 7, the overload switch 73 opens a contact to cut off the current supply from the single-phase AC commercial power supply AC to the stator winding 7. As a result, before the hermetic electric compressor C is operated due to an overload and the hermetic electric compressor C is damaged, the power supply to the stator winding 7 is cut off and the induction synchronous motor 2 is turned off.
Can be protected.

FIG. 20 is a vertical sectional side view of a part of the other hermetic electric compressor C (in the vicinity of the end cap portion 1B). In FIG. 20, the hermetic electric compressor C is provided with a thermostat 65 for opening and closing a contact at a predetermined temperature as a temperature protection means.
Reference numeral 5 is fixed to an end cap portion 1B serving as an outer surface of the closed container 1. That is, the thermostat 65 is a closed container 1
The contact is opened and closed according to the temperature of the end cap portion 1B, which is fixed to the sealed terminal 25 side, which is the end face side of. In addition, 7
4 is a cover for protecting the sealed terminal 25 and the thermostat 65, and 75 is a nut for fixing the cover 74.

FIG. 21 is an electric circuit diagram of the induction synchronous motor 2 of the hermetic electric compressor C shown in FIG. FIG.
1, an induction synchronous motor 2 supplied with power from a single-phase AC commercial power supply AC via an overload switch 73 and a thermostat 65 includes a stator winding 7 including a main winding 7A and an auxiliary winding 7B. The main winding 7A connected to one side of the phase AC commercial power supply AC is connected to the other of the single phase AC commercial power supply AC. The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC is connected to the other side of the single-phase AC commercial power supply AC via the operation capacitor 47.

The auxiliary winding 7B is connected to the other end of the single-phase AC commercial power supply AC via the contact 61B of the starting relay 61 and the starting capacitor 48, and these contacts 61B and the starting capacitor 48 are connected in series. , Contact 61B,
An operating capacitor 47 is connected in parallel with the starting capacitor 48. The operating capacitor 47 is set to a capacity suitable for steady operation, and the capacitors 47 and 48 are set to a capacity suitable for starting in a state where the operating capacitor 47 and the starting capacitor 48 are connected in parallel. still,
48A is a discharge resistor for discharging the current charged in the starting capacitor 48, 61A is a starting relay coil, PSW
Is a power switch.

When the power switch PSW is turned on, a current flows from the single-phase AC commercial power supply AC to the main winding 7A and the auxiliary winding 7B. When the induction synchronous motor 2 is started at the beginning, a current flows through the starting relay coil 61A to close the contact 61B, and the auxiliary winding 7B is connected to the operating capacitor 4 connected in parallel.
7. A starting torque is obtained from a current phase difference between the starting capacitor 48 and the main winding 7A, and the induction synchronous motor 2 starts a starting operation. Then, when the induction synchronous motor 2 starts rotating by this energization, the contact 61B is opened to disconnect the starting capacitor 48, and the main winding 7 of the operating capacitor 47 is cut off.
The induction synchronous motor 2 continues the steady operation due to the current phase difference between A and the auxiliary winding 7B. The hermetic electric compressor C is operated by the rotation of the induction synchronous motor 2, and the air conditioner performs indoor air conditioning. In the refrigerator, the inside of the refrigerator is cooled.

When the hermetic electric compressor C is operated, the temperature of the compressor 3 rises to a high temperature. When the temperature of the compressor 3 becomes high, the temperature of the end cap portion 1B also increases, and the thermostat 65 detects the temperature of the end cap portion 1B.
When the temperature of the end cap portion 1B is higher than a preset temperature, the contact is opened, and thereby the power supply to the stator winding 7 is cut off. As a result, during the operation of the hermetic electric compressor C, the power supply to the stator winding 7 can be cut off before the end cap portion 1B generates abnormal heat, and damage to the stator winding 7 and permanent magnet It is possible to reliably prevent the temperature demagnetization of 31.

When an overload current flows to the stator winding 7 due to an overload operation of the hermetic electric compressor C or the like, the overload switch 73 detects it, and the detected current is set to a preset current. If it is larger, the overload switch 73 opens the contact and cuts off the current to the stator winding 7. As a result, before the hermetic electric compressor C is operated due to overload and the hermetic electric compressor C is damaged, energization of the stator winding 7 is cut off to protect the induction synchronous motor 2. It is possible to do. Note that either the thermostat 65 or the overload switch 73 cuts off the current to the stator winding 7 by a signal detected first to protect the induction synchronous motor 2.

Next, FIG. 22 shows an electric circuit diagram of the induction synchronous motor 2 of another hermetic electric compressor C. Incidentally, 65
Is a thermostat, and the thermostat 65 is assumed to be fixed to the outer surface of the closed container 1 as in FIG. FIG.
2, an induction synchronous motor 2 supplied with electric power from a single-phase AC commercial power supply AC includes a stator winding 7 including a main winding 7A and an auxiliary winding 7B. The connected main winding 7A is connected to the other of the single-phase AC commercial power supply AC. The auxiliary winding 7B connected to one side of the single-phase AC commercial power supply AC is connected to an operation capacitor 47.
Is connected to the other end of the single-phase AC commercial power supply AC. The operation capacitor 47 is set to a capacitor capacity suitable for starting and steady-state operation of the induction synchronous motor 2.

The power switch PSW and the stator winding 7
Between the single-phase AC commercial power supply AC and the stator winding 7
And a control relay 49 also serving as a protection switch for shutting off the power supply to the stator winding 7 while supplying power to the stator winding 7. Reference numeral 62 denotes a controller.
Reference numeral 2 is connected to a thermostat 65 fixed to the end cap portion 1B and to a control relay coil 49A of the control relay 49. Further, a current-sensitive line current detector 63 is connected to the controller 62 as overload protection means connected to one side of the single-phase AC commercial power supply AC to detect a line current. 49B is a control relay contact.

Then, the power switch PSW is closed,
When power is supplied from the single-phase AC commercial power supply AC to the stator winding 7, a parallel circuit of an operation capacitor 47 and a main winding 7A is connected to the auxiliary winding 7B, and the main winding 7A and the auxiliary winding are connected. 7
The induction synchronous motor 2 starts the starting operation by obtaining the starting operation torque by the current phase difference of B, and continues the operation as it is by the current phase difference of the main winding 7A and the auxiliary winding 7B by the operation capacitor 47. 2 continues the steady operation. In this case, the operating condenser 47 also serves as a starting condenser.

When the hermetic electric compressor C is operated, the temperature of the compressor 3 rises to a high temperature. When the temperature of the compressor 3 becomes high, the temperature of the end cap portion 1B (the outer surface of the closed container 1) also rises, and the thermostat 65 detects the outer surface temperature of the closed container 1. When the detected temperature is higher than a preset temperature, the contact is closed. close. Thereby, the controller 62
Detects that the outer surface temperature of the airtight container 1 is higher than the set temperature, applies a current to the control relay coil 49A, opens the control relay contact 49B, and cuts off the current to the stator winding 7. As a result, during operation of the hermetic electric compressor C, the energization to the stator winding 7 can be cut off before the hermetic container 1 generates abnormal heat, and damage to the stator winding 7 and the permanent magnet 31 Temperature demagnetization can be reliably prevented.

When a large current flows through the stator winding 7 due to an overload operation of the hermetic electric compressor C or the like, the line current detector 63 detects the current, and the detected current is set to a preset current. If so, the controller 62 applies a current to the control relay coil 49A, and the control relay contact 49
B opens to cut off the current supply to the stator winding 7. As a result, before the operation of the hermetic electric compressor C due to the overload is performed and the stator winding 7 is damaged, the power supply to the stator winding 7 is cut off and the induction synchronous motor 2 is protected. It becomes possible. The controller 62 protects the induction synchronous motor 2 by cutting off the current to the stator winding 7 by a signal detected by either the thermostat 65 or the line current detector 63 first.

The controller 62 has a built-in timer. The controller 62 is an induction synchronous motor 2
After turning off the power supply, wait for a predetermined delay time to elapse,
The power supply to the induction synchronous motor 2 is restored. That is, the controller 62 is configured to supply power to the induction synchronous motor 2 after a predetermined time elapses by the timer from when power supply to the induction synchronous motor 2 is cut off to when power is supplied to the induction synchronous motor 2 next time. Thus, for example, when energization and cutoff of the induction synchronous motor 2 are frequently repeated due to a start mistake of the induction synchronous motor 2, the rotor 5 becomes high temperature. After the power is turned off, the induction synchronous motor 2 is energized after the elapse of a predetermined delay time, so that the permanent magnet 31 embedded in the rotor 5 is demagnetized by the heating of the rotor 5. Can be prevented.

As described above, the hermetic electric compressor C is provided with the temperature protection means (thermistor 46, bimetal switch 64, or thermostat 65) for cutting off the power supply to the induction synchronous motor 2 by a predetermined temperature rise. Accordingly, during operation of the hermetic electric compressor C, power supply to the stator winding 7 can be cut off before the stator winding 7 generates abnormal heat. This makes it possible to prevent the temperature of the permanent magnet 31 embedded in the rotor yoke portion 5A from being demagnetized due to a rise in temperature, thereby greatly improving the reliability of the hermetic electric compressor C. Will be able to do it.

Further, the hermetic electric compressor C is provided with overload protection means (line current detector 63 or overload switch 73) for cutting off the power supply to the induction synchronous motor 2 by a predetermined overload current. Therefore, during the overload operation of the hermetic electric compressor C, it is possible to prevent and protect the induction synchronous motor 2 from being heated by cutting off the power supply to the induction synchronous motor 2. Thereby, the induction synchronous motor 2
Can be prevented beforehand, so that the life of the induction synchronous motor 2 can be greatly extended, and the reliability of the hermetic electric compressor C can be significantly improved.

In the embodiment, the rotary compressor is used as an example of the hermetic electric compressor C. However, the present invention is not limited to the rotary compressor but is also applicable to a hermetic scroll compressor having a pair of meshing meshes. .

[0090]

As described above in detail, according to the present invention, the hermetic electric compressor includes a compression element and an electric element for driving the compression element in a closed container. , Comprising a stator fixed to the hermetic container and having a stator winding, and a rotor that rotates within the stator, and the rotor is provided around a rotor yoke. Since a secondary conductor and a permanent magnet embedded in the rotor yoke are provided, and the closed vessel is provided with temperature protection means for cutting off the power supply to the electric element due to a predetermined temperature rise. For example, if the temperature protection means is attached to the stator winding as described in claim 2, it becomes possible to cut off the current supply to the electric element when the temperature of the stator winding rises. This makes it possible to prevent the temperature of the permanent magnet embedded in the rotor yoke from being demagnetized due to a rise in the temperature of the electric element. Therefore, it is possible to cut off the current to the stator winding before the stator winding generates abnormal heat during operation of the hermetic electric compressor,
Damage to the stator windings and temperature demagnetization of the permanent magnet can be reliably prevented, the driving force of the induction synchronous motor can be suitably maintained, and the reliability of the electric element can be significantly improved. It is.

According to the third aspect of the present invention, the hermetic electric compressor is provided with a compression element and an electric element for driving the compression element in a closed container. It is fixed to a closed container, and includes a stator having a stator winding, and a rotor that rotates within the stator.
The rotor includes a secondary conductor provided around the rotor yoke and a permanent magnet embedded in the rotor yoke, and a predetermined temperature increase on the outer surface of the closed vessel. Since the temperature protection means for cutting off the current supply to the electric element is provided, for example, when the temperature of the outer surface of the closed container rises due to heat generation of the electric element, it is possible to cut off the electric current supplied to the electric element. Become. This makes it possible to suppress a rise in the temperature of the sealed container. Therefore, it is possible to prevent an accident such as a fire due to a rise in the temperature of the sealed container.

According to a fourth aspect of the present invention, in addition to the first, second or third aspect of the present invention, the hermetic electric compressor has a thermistor whose resistance value varies with temperature. And a controller that controls the energization of the electric element based on a change in the resistance value of the thermistor, for example, when the temperature of the hermetic electric compressor rises and exceeds a preset temperature. The energization of the electric element is controlled by the controller, so that the rotation speed of the electric element can be reduced or the energization of the electric element can be cut off. Thus, it is possible to control the energization supplied to the stator windings before the hermetic electric compressor is operated due to the overload and the hermetic electric compressor is damaged. Therefore, since the temperature of the electric element can be controlled without stopping the operation of the hermetic electric compressor, inconveniences such as insufficient cooling caused by stopping the hermetic electric compressor can be reliably eliminated, Further, since the temperature rise of the electric element can be reliably controlled by controlling the rotation of the electric element, the life of the electric element is extended, and the reliability of the hermetic electric compressor can be significantly improved. is there.

According to a fifth aspect of the present invention, in the hermetic electric compressor, in addition to the first, second or third aspect, the temperature protection means is constituted by a bimetal switch. Therefore, even when the temperature of the hermetic electric compressor rises, it is possible to cut off the current supply to the electric element. This eliminates the need to control and adjust the electric elements using expensive circuit elements. Therefore, it is possible to reliably and inexpensively prevent damage to the hermetic electric compressor due to temperature rise.

According to a sixth aspect of the present invention, in addition to the first, second, or third aspect, the hermetic electric compressor is further characterized in that the temperature protection means includes a thermostat that opens and closes a contact according to temperature. Therefore, even when the temperature of the hermetic electric compressor rises, it is possible to cut off the current supply to the electric element. This eliminates the need to control and adjust the electric elements using expensive circuit elements. Therefore, it is possible to reliably and inexpensively prevent damage to the hermetic electric compressor due to temperature rise.

According to the seventh aspect of the present invention, the hermetic electric compressor comprises a compression element and an electric element for driving the compression element in a closed container, wherein the electric element is , Comprising a stator fixed to the hermetic container and having a stator winding, and a rotor that rotates within the stator, and the rotor is provided around a rotor yoke. It has a secondary conductor and a permanent magnet embedded in the rotor yoke, and has overload protection means for cutting off the power to the electric element by a predetermined overload current. It is possible to prevent and protect the temperature of the electric element from being raised by cutting off the power supply to the electric element during the overload operation of the electric compressor. Thus, damage to the electric element can be prevented beforehand, so that the life of the electric element can be greatly extended. Therefore, the reliability of the hermetic electric compressor can be significantly improved.

Further, according to the invention of claim 8, in the hermetic electric compressor, in addition to claim 7, the overload protection means is constituted by an overload switch.
During overload operation of the hermetic electric compressor, the power supply to the electric element is cut off to prevent and protect the electric element from rising in temperature. Thus, damage to the electric element can be prevented beforehand, so that the life of the electric element can be greatly extended. Therefore, the reliability of the hermetic electric compressor can be significantly improved.

According to a ninth aspect of the present invention, in addition to the seventh aspect, the hermetic electric compressor further comprises a current transformer for detecting a current flowing to the electric element; Since the controller is configured to control the energization of the electric element based on the output of the current transformer, it is possible to interrupt the energization of the electric element by the controller during the overload operation of the hermetic electric compressor. It becomes possible. As a result, it is possible to prevent and protect the electric element from rising in temperature. Therefore, it is possible to reliably prevent the electric element from being damaged by the overload current.

According to a tenth aspect of the present invention, in addition to the fourth or ninth aspect, the hermetic electric compressor further comprises a controller for controlling the controller so that the temperature or the current exceeds a predetermined value for a predetermined time. Since the energization of the electric element is cut off after the lapse of time, it is possible to prevent the electric element from being damaged due to continuous temperature rise or current over due to overload operation of the hermetic electric compressor by a controller. Becomes possible. As a result, damage to the electric element can be prevented beforehand, so that the life of the electric element can be greatly extended. Therefore, the reliability of the hermetic electric compressor can be significantly improved.

Further, in the hermetic electric compressor according to the eleventh aspect of the present invention, in addition to the tenth aspect, the controller waits for a predetermined delay time to elapse after turning off the power to the electric element. Since the energization of the electric element is restored, there is always a delay time between the interruption of the energization of the electric element and the energization of the electric element next time. Thus, for example, it is possible to prevent the rotor from becoming hot due to frequent repetition of energization and disconnection of the electric element. Therefore, the permanent magnet embedded in the rotor can be prevented from being demagnetized by heat.

[Brief description of the drawings]

FIG. 1 is an example of a vertical sectional side view of a hermetic electric compressor to which an induction synchronous motor of the present invention is applied.

FIG. 2 is a plan view of a hermetic electric compressor in which a hermetic container is divided into two parts.

FIG. 3 is a cross-sectional top view of the electric motor.

FIG. 4 is a partially cutaway top view of the rotor.

FIG. 5 is a side view of the rotor.

FIG. 6 is a top view of the rotor.

FIG. 7 is a partial longitudinal side view of the rotor of FIG. 6;

FIG. 8 is a refrigerant circuit diagram of an air conditioner or an electric refrigerator using the hermetic electric compressor of the present invention.

FIG. 9 is a vertical sectional side view of a part (near an end cap) of the hermetic electric compressor.

FIG. 10 is an electric circuit diagram of the induction synchronous motor.

FIG. 11 is a longitudinal sectional side view of a part (near an end cap) of another hermetic electric compressor.

FIG. 12 is an electric circuit diagram of the induction synchronous motor of the hermetic electric compressor of FIG. 11;

FIG. 13 is a vertical sectional side view of a part (near an end cap portion) of another hermetic electric compressor.

FIG. 14 is a vertical sectional side view of a part (near an end cap portion) of another hermetic electric compressor.

FIG. 15 is an electric circuit diagram of an induction synchronous motor of the hermetic electric compressor of FIG. 14;

FIG. 16 is a vertical sectional side view of a part (near an end cap portion) of another hermetic electric compressor.

FIG. 17 is an electric circuit diagram of the induction synchronous motor of the hermetic electric compressor of FIG. 16;

FIG. 18 is a longitudinal sectional side view of a part (near an end cap portion) of another hermetic electric compressor.

FIG. 19 is an electric circuit diagram of the induction synchronous motor of the hermetic electric compressor of FIG. 18;

FIG. 20 is a vertical sectional side view of a part (near an end cap portion) of another hermetic electric compressor.

FIG. 21 is an electric circuit diagram of the induction synchronous motor of the hermetic electric compressor of FIG. 20;

FIG. 22 is an electric circuit diagram of another induction synchronous motor of the hermetic electric compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 1B End cap part 2 Induction synchronous motor 3 Compressor 4 Stator 5 Rotor 6 Rotating shaft 7 Stator winding 7A Main winding 7B Auxiliary winding 25 Sealing terminal 28 Condenser 29 Receiver 31 Permanent magnet 46 Thermistor 49 Control relay 61 Starting relay 62 Controller 63 Wire current detector 64 Bimetal switch 65 Thermostat 73 Overload switch C Hermetic electric compressor AC Single-phase AC commercial power supply

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H02K 11/00 H02K 15/03 C 5H622 15/03 17/30 B 17/30 21/14 M 21/14 11/00 E (72) Inventor Masaaki Takezawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazuhiko Arai 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Inventor Eiichi Murata 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Prefecture Inside Sanyo Electric Co., Ltd. (72) Noboru Onodera 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Shigemi Koiso 2-5-5, Keihanhondori, Moriguchi-shi, Osaka Pref. Sanyo Electric Co., Ltd. (72) Kazuhiro Enomoto 2, Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric (72) Inventor Yoshitomo Nakayama 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 3H003 AA02 AA05 AB04 AC03 CF00 5H002 AA09 AB04 AC03 5H013 CC00 JJ05 KK03 KK07 5H611 AA03 BB01 BB05 PP02 QQ04 SS01 TT01 UA01 UA02 UA04 5H621 AA01 BB07 BB09 GA01 HH03 HH10 JK02 JK03 JK13 5H622 AA01 AA04 CA02 CA09 CA10 CA12 CA13 CB03 CB05 DD02 PP03 PP08 QP14 PP16 QA

Claims (11)

[Claims] 1. A closed electric compressor including a compression element and an electric element for driving the compression element in a closed container, wherein the electric element is fixed to the closed container and includes a stator winding. And a rotor that rotates within the stator. The rotor is embedded in a secondary conductor provided around the rotor yoke and in the rotor yoke. And a temperature protection means for interrupting energization of the electric element when a predetermined temperature rise occurs in the closed container. 2. The hermetic electric compressor according to claim 1, wherein said temperature protection means is attached to said stator winding. 3. A hermetic electric compressor including a compression element and an electric element for driving the compression element in a closed container, wherein the electric element is fixed to the closed container and includes a stator winding. And a rotor that rotates within the stator. The rotor is embedded in a secondary conductor provided around the rotor yoke and in the rotor yoke. And a permanent magnet provided on the outer surface of the hermetic container, wherein a temperature protection means is provided on an outer surface of the hermetic container for cutting off the power supply to the electric element when a predetermined temperature rise occurs. 4. The temperature protection means includes a thermistor whose resistance value changes with temperature, and a controller which controls energization of the electric element based on a change in resistance value of the thermistor. The hermetic electric compressor according to claim 1, 2 or 3. 5. The hermetic electric compressor according to claim 1, wherein said temperature protection means comprises a bimetal switch. 6. The hermetic electric compressor according to claim 1, wherein said temperature protection means is constituted by a thermostat which opens and closes contacts according to temperature. 7. A hermetic electric compressor including a compression element and an electric element for driving the compression element in a closed container, wherein the electric element is fixed to the closed container and includes a stator winding. And a rotor that rotates within the stator. The rotor is embedded in a secondary conductor provided around the rotor yoke and in the rotor yoke. And an overload protection means for cutting off the power supply to the electric element by a predetermined overload current. 8. The apparatus according to claim 7, wherein said overload protection means comprises an overload switch.
Hermetic electric compressor 9. The overload protection means includes a current transformer for detecting a current supplied to the electric element, and a controller for controlling the current supplied to the electric element based on an output of the current transformer. 8. The hermetic electric compressor according to claim 7, wherein 10. The hermetic electric compression according to claim 4, wherein the controller cuts off the power supply to the electric element after a predetermined time has elapsed after the temperature or the current has exceeded a predetermined value. Machine. 11. The closed-type electric motor according to claim 10, wherein the controller returns the energization to the electric element after a predetermined delay time elapses after the energization to the electric element is cut off. Compressor.