JPH05199717A - Manufacture of molded motor - Google Patents

Abstract

PURPOSE:To obtain a molded motor in which a temperature relay can be effectively internally mounted in a frame of premix by providing the relay longitudinally at a downstream side of the premix flowing from a gate, and molding it with the premix. CONSTITUTION:A gate 36 is composed so as to be disposed substantially at a position of an end face of a stator when the stator is mounted in molds, and a temperature relay 31 is provided along an arrow 35 of flowing of premix at the stator. When the premix is charged, the premix flows from the gate 36 to a downstream side at the relay 31, but since the relay is directed longitudinally along its flow, even if it is washed with the premix having high viscosity, it does not flow, and even if it is not rigidly mounted, it can endure it. When the relay 31 is buried in the premix in this manner, it is enclosed in the premix having excellent heat transfer, and hence heat generation of both a main winding 2a and an auxiliary winding 2b is transferred to the relay 31 in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a mold electric motor having a temperature relay which operates when overheated.

[0002]

2. Description of the Related Art In a mold motor, when a winding is wound or a rotor is restrained and an overcurrent flows, the winding heats up and a power supply is generated. Unless it is shut off, it will overheat and burn.

Since the frame forming the outer periphery of the mold electric motor is formed by the premixed mold, it does not seem to burn in appearance, but it is substantially made of vinyl inside. Insulating coatings for parts and windings, and tapes for insulation that gasify and ignite when heated are used.

When abnormally overheated, the flame cracks formed by thermal expansion of the inside or a gap of the iron core exposed on the inner diameter side becomes a thermal gas and is jetted to cause overheating. It was supposed to be ignited by the frame.

Further, such burnout not only damages the mold electric motor, but also burns combustible parts in the surroundings, which may eventually burn out the main body of the equipment.

Therefore, when there is a risk of ignition, the
It was necessary to equip the outside of the field motor with a temperature relay that shuts off the power supply due to an abnormal temperature rise.

However, when the mold electric motor is provided with a temperature relay on the outside, a considerable temperature gradient is formed between the electric motor and the winding, so that the temperature relay may not operate accurately at the set temperature. ..

This is operated when the heat of the winding is transmitted to the outside through the frame composed of the premix and then the temperature relay contacting the frame is heated to a predetermined temperature. Therefore, a considerable temperature gradient will be formed between the winding and the time delay.

Particularly, the temperature relay attached to the outside of the frame causes a considerable temperature gradient even if it is in close contact with the frame. If there is a gap between them or the outside of the frame is exposed to cooling air, it will be significantly affected.

For this reason, it is necessary to lower the operating temperature of the temperature relay, but such a treatment makes the operating characteristics unstable, and it can be expected that a reliable operation is performed at a predetermined temperature. It wasn't something.

Therefore, in the conventional mold motor, the temperature relay is closely attached to the frame so as to cover the temperature relay with a cover of a steel plate having good heat conductivity, and the temperature relay is mounted between the temperature relay and the winding. It was designed so that there would be no large temperature gradient and that it would not be affected by the environment such as cooling air.

Alternatively, a hole is formed in the frame and a temperature relay is inserted in this hole.

However, in spite of such efforts to prevent a temperature gradient between the temperature relay and the winding wire, if the temperature relay is provided outside the frame, the wiring is not only troublesome but also the wiring. Since it was exposed, it was an obstacle to attach the mold motor to the equipment.

The present invention has been made in view of the above circumstances, and the temperature relay is surely installed in the premix frame, and the winding raratio and rotor are restrained. In the case of an abnormal temperature rise that occurs in the event of an accident, etc., it is an object of the present invention to provide a method for manufacturing a mold electric motor that can quickly turn off the power supply to stop the abnormal temperature rise and prevent the danger of ignition, etc. ..

[0015]

SUMMARY OF THE INVENTION According to the present invention, a stator is mounted, and a mold for forming a premix is formed on the outer periphery of the stator. When the stator is mounted on the mold,
A gate for filling the premix is formed at a position substantially at the end surface of the stator, and a temperature relay is provided in the longitudinal direction along the flow of the premix on the downstream side of the premix flowing from the gate. The problem is solved by molding with premix.

[0016]

When the premix is filled in the mold,
The premix flows vigorously from the gate, and the temperature relay provided on the downstream side where the premix flows flows is washed by the premix.

However, at this time, the temperature relay is attached in the longitudinal direction along the flow of the premix, and the area facing the flow of the premix is minimized.

Moreover, the temperature relay has a lead wire drawn out at the end portion in the longitudinal direction thereof, and can be stopped at a predetermined position without being flowed together with the lead wire.

Therefore, it is possible to solve the problem that the temperature relay moves at the time of molding to impair the effect.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a vertical sectional view of an electric motor according to an embodiment of the present invention.

FIG. 2 is a plan view of a stator of an electric motor according to an embodiment of the present invention.

FIG. 3 is a wiring diagram of the electric motor.

FIG. 4 is a perspective view of an essential part showing a state in which a temperature relay is attached.

FIG. 5 is a longitudinal cross-sectional view of a main part showing a mold type state.

FIG. 6 is a plan view of an essential part showing how the premix is filled.

FIG. 7 is a plan view of an essential part showing how a premix according to another embodiment is filled.

In FIG. 1, the mold motor is an iron core 1
A winding 2 is wound in a toroidal shape, and a frame 3 is formed from the outside by a premix mode.

The frame 3 is provided with a bearing housing 4 formed integrally with the frame 3 on one side in the axial direction, and supports the rotor 6 via a bearing 5a.

Further, on the other side of the frame 3 in the axial direction,
A bracket 7 is provided. The bracket 7 supports the rotor 6 by a bearing 5b, and is fitted in an annular groove formed on the inner diameter side of the axial end surface of the frame 3, and further has a screw 8 Is fixed by.

The winding wire 2 is connected by a printed circuit board 9 embedded in the frame 3, and a lead wire 10 is connected to the printed circuit board 9 and a bushing 11 is provided outside the frame 3. Have been pulled out to.

Further, a hall element 12 is attached to the printed board 9 and is close to the ring-shaped magnet 13 attached to the rotor 6.

The printed circuit board 9 is supported by a supporting portion 30 which is integral with the insulating layer formed on the iron core 1.

In order to insulate the winding 2 from the core 1, an insulating layer is formed by premolding, or an insulating member is formed in advance and attached to the core 1 by any method. The wire 2 is wound after insulating the wire.

The winding 2 is formed by a toroidal winding method in which it is wound around the yoke portion of the iron core.

In FIG. 2, a winding 2 is wound around an iron core 1 by a toroidal method, and the winding 2 is a main winding 2a.
And the auxiliary winding 2b.

Pins 15 are formed on a plurality of supporting portions 30 that are integrally erected on the insulating layer 14 formed on the outer surface of the iron core 1. This printed circuit board 9 has pins 1
5 and is supported so as to be placed on the support portion 30.

An elongated temperature relay 31 is connected between the main winding 2a and the auxiliary winding 2b of the winding 2, and the temperature relay 31 has a donut shape in its longitudinal direction. It is the same as the circumferential direction of the formed iron core 1, and the lead wires 34 led out on both sides are also led out in the circumferential direction of the iron core 1.

The printed circuit board 9 is connected to the lead wire 10
Is formed, and the lead wire 10 connected to the terminal portion 16 is connected to a power source, a control device, and the like (not shown).

For example, the control device may be one for the purpose of controlling the number of revolutions, such as receiving a signal from the hall element 12 to change the power supply voltage.

Referring to FIG. 3, the mold motor has a winding 2
Is composed of the main winding 2a and the auxiliary winding 2b, and the component group 21 such as the hall element 12 and the lead wire 10 are connected to the printed circuit board 9.
Are connected by a plurality of terminals 20 formed on the.

The capacitor 22 and the power source 23 can be connected to the outside via the lead wire 10.

The temperature relay 31 is constructed so as to be directly connected to the power source 23.

In FIG. 4, a main winding 2a and an auxiliary winding 2b are wound around an iron core 1 with an insulating layer 14 interposed therebetween, and a temperature relay 31 is provided so that the longitudinal direction is oriented in the circumferential direction of the iron core 1. Has been.

The temperature relay 31 has lead wires 34 drawn out from both ends in the longitudinal direction, and the lead wires 34 are constructed so as to be connected to a power supply circuit (not shown) or the like. There is.

Further, the temperature relay 31 may be fixed by lightly binding it to the iron core 1, the insulating layer 14 thereof, the main winding 2a, the auxiliary winding 2b, or the like.

In FIG. 5, a winding 2 is wound around an iron core 1 via an insulating layer 14 to form a stator, and the iron core 1 is supported by a shaft-shaped jig mandrel 25 and is of a mold type. It is held so as to be covered by the upper mold 26a and the lower mold 26b which are constituents.

The upper die 26a and the lower die 26b are divided at the position of the printed circuit board, and the lead wire 10 is drawn out through the bushing 11 at the dividing surface.

Further, the iron core 1, the upper die 26a and the lower die 26b.
It is configured such that the premix 27 is filled in the gap formed between the and.

Although the printed circuit board 9 is not shown in the stator in the figure, the printed circuit board 9 is actually provided near one of the gates 36 as shown in FIG. ..

In FIG. 6, the stator in which the winding 2 is wound around the iron core 1 is set in the lower mold 26b, and the upper mold 26a is mounted on the lower mold 26b. As described above, the premix 27 is configured to be filled from the two opposing gates 36.

The gate 36 is constructed so as to be located substantially at the end face of the stator mounted on the core metal 25, and the premix 27 filled from the gate 36 is the stator. It is configured so as to flow from the vicinity of the end face as indicated by an arrow 35.

Further, the stator is provided with a temperature relay 31 along the arrow 35 through which the premix 27 flows, and the temperature relay 31 is attached to the downstream side of the gate 36 and has a long length. The direction is the circumferential direction of the stator.

The printed circuit board 9 in the figure is omitted as in FIG.

FIG. 7 shows another embodiment, in which the position of the temperature relay 31 is different from that of the embodiment shown in FIG.

In the method of manufacturing a mold motor having such a structure, the iron core 1 is covered with the insulating layer 14, and the winding 2 is wound around the yoke portion by a toroidal method to form a fixing and a lead. The printed circuit board 9 to which the line 10 and the component group 21 are attached is mounted.

Then, a temperature relay 31 is attached to a part of the stator with its longitudinal direction aligned with the circumferential direction of the stator.

Although not shown, the temperature relay 31 may be attached to the iron core 1 or the like with a thread, or may be attached to the winding 2 or the like.

The iron core 1 assembled in this manner is used as the core metal 25.
The upper mold 26a and the lower mold 26b are filled with the premix 27, and the upper mold 26a and the lower mold 26b are heated and cured to form the frame 3.

When the premix 27 is charged, the temperature relay 31 is such that the premix 27 charged from the gate 36 flows downstream between the upper mold 26a and the lower mold 26b. Since the temperature re-31 is provided with its longitudinal direction oriented along the flow, it does not flow even if it is washed by the high-viscosity premix 27, and it can endure without being firmly attached. ..

In this way, the temperature relay 31 is the premix 2
When embedded in No. 7, since the temperature relay 31 is surrounded by the premix 27 having good heat conduction even if the temperature relay 31 is not in contact with the winding 2, heat generation in both the main winding 2a and the auxiliary winding 2b is short. It will be conducted to the temperature relay 31 over time, and even if the proximity relation between the main winding 2a, the auxiliary winding 2b, and the temperature relay 31 is irregular, the operating characteristics of the temperature relay 31 will be greatly affected. Does not give.

Therefore, the temperature relay 31 is connected to the main winding 2
a, sufficiently good operating characteristics can be obtained without pressure contact with the auxiliary winding 2b, and it is possible to avoid damaging the temperature relay 31 by forcibly contacting the main winding 2a and the auxiliary winding 2b. ..

Next, the frame 3, the rotor 6, and the bearing 5 are attached.
Assemble a and b and the bracket 7 and assemble with the screw 8.

When the mold electric motor in which the frame 3 is formed in this manner is completed, the power source 23 can be connected through the lead wire 10.

Therefore, when a layer short occurs in the winding 2 of the molded motor, a short circuit current flows in the layered winding 2 to generate heat.

The heat generated by the winding 2 is caused by the temperature relay.
When the temperature relay 31 is detected and the temperature relay 31 operates, the power is cut off and the heat generation is stopped.

Since the temperature relay 31 is mounted between the main winding 2a and the auxiliary winding 2b, the main winding 2
Temperature relay regardless of whether heat is generated in either a or auxiliary winding 2b.
31 will be affected by heat generation.

Moreover, the premix 27 having good heat conduction
Since it is covered with, the heat is easily conducted to the temperature relay 31, and the temperature relay 31 operates sensitively.

If such a temperature relay 31 that operates at an operating temperature of about 170 degrees Celsius is adopted, the difference from the temperature of the winding 2 is preferably about 40 degrees from the conventional common sense. It is possible to adopt the winding 2 of the E type insulation.

The operating temperature of the temperature relay 31 is set to 170
The temperature of the premix 27 at the time of molding becomes 14
By setting a low temperature mode of about 0 degrees, the temperature relay
The difference from 31 is 30 degrees.

Therefore, the temperature relay 31 is hardly affected by the temperature of the premix 27 at the time of molding, and a type of temperature relay called a temperature fuse which does not recover can be adopted. ..

Further, the premix 27 does not have a large temperature difference from the upper limit temperature of the winding 2 of the type E insulation at the time of molding,
There is almost no deterioration of the insulating film, and when combined with these temperature characteristics, a highly reliable method of manufacturing a mold electric motor can be obtained.

[0072]

According to the present invention, since the temperature relay is fixed in the longitudinal direction in the circumferential direction of the stator, when the premix is filled, the flow direction becomes that of the premix which is added to the temperature relay. The pressure is minimized, damage and deviation of the temperature relay can be avoided, and a mode electric motor having a temperature relay that operates reliably can be obtained, and the effect thereof is great.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electric motor according to an embodiment of the present invention.

FIG. 2 is a plan view of a stator of an electric motor according to an exemplary embodiment of the present invention.

FIG. 3 is a wiring diagram of an electric motor.

FIG. 4 is a perspective view of an essential part showing a state in which a temperature relay is attached.

FIG. 5 is a longitudinal sectional view of a main part showing a mold type state.

FIG. 6 is a plan view of an essential part showing how the premix is filled.

FIG. 7 is a plan view of an essential part showing how a premix according to another embodiment is filled.

[Explanation of symbols]

 1 ... Iron core 2 ... Winding 3 ... Frame 6 ... Rotor 7 ... Bracket 8 ... Screw 9 ... Printed circuit board 26a ... Upper mold 26b ... Lower mold 31 ... Temperature relay 36 ...... Gate

Claims (1)

[Claims] 1. A mold motor for forming a frame with a premix mold on the outer circumference of a stator, wherein a stator is mounted and a mold type capable of filling the premix with the outer circumference is formed. When the stator is mounted on the mold type, the premix is filled at a position almost at the end face of the stator.
A temperature motor is provided in the longitudinal direction along the flow of the premix on the downstream side of the premix flowing from the gate, and the premix is used for molding. Production method.