JPH08251872A - Cooler of motor - Google Patents

Abstract

PURPOSE: To keep stable high-speed revolution and required output by effectively radiating the heat generated in a stator and a rotor to outside of a motor. CONSTITUTION: In a high-speed motor, which is provided with a stator core 8 provided, at the inside periphery, with a plurality of slots 7 for accommodating stator coils 9, a rotor 18 opposite apart to the inside periphery of the stator core 8, a frame outside the stator core 8, and a frame cooling jacket 3 for passing a refrigerant to this frame 2, ring-shaped or C-shaped stator cooling jackets are provided at one end at least out of both ends the stator iron core 8 or at divisions being made by dividing the stator core 8 in axial direction into a plurality of pieces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a motor that drives, for example, a wind and hydropower machine or a refrigerator.

[0002]

2. Description of the Related Art Conventionally, for example, a motor for driving a wind-hydraulic machine such as a screw compressor, a blower, or a pump, or a refrigerator is driven to rotate at a high speed.
By providing a spiral cooling jacket between the stator core and the frame, and by passing the refrigerant through this cooling jacket,
The heat generated in the rotor and stator coils is absorbed to cool the motor.

[0003]

However, in a motor which is rotationally driven at a high speed (hereinafter referred to as a high speed motor), the temperature of the stator surface rises for the following reasons. Since the cooling jacket is arranged at a position away from, the heat transfer efficiency is poor, so that there is a problem that the cooling capacity is insufficient and efficient cooling cannot be performed. As a result, the rotation speed of the high-speed motor cannot be increased,
In addition, there is a problem that the required output cannot be output. (1) When the rotating body rotates at high speed, harmonic loss such as core loss and stray loss due to the inverter power supply increases on the surface of the stator. (2) When the heat loss due to copper loss in the stator windings conducts heat to the stator core, the temperature of the surface of the stator core rises locally.

[0004]

In order to solve the above problems, the present invention is as follows. (1) A stator core having a plurality of slots for accommodating a stator coil provided in an inner peripheral portion thereof, a rotor facing the inside of the stator core with a gap therebetween, and a frame outside the stator core. In a motor provided with a frame cooling jacket for passing a refrigerant between the stator core and the frame, at least one end of both ends of the stator core, or a plurality of stator cores in the axial direction. A ring-shaped or C-shaped stator cooling jacket is provided on each of the divided portions. (2) The stator cooling jacket provided on the stator core,
The stator and the stator core are provided up to predetermined positions on the tooth tips. (3) The coolant supply hole and the coolant discharge hole of the stator cooling jacket are communicated with the frame cooling jacket. (4) The coolant supply hole and the coolant discharge hole of the stator cooling jacket are communicated with an external coolant supply device. (5) A space surrounded by the coil end of the stator coil, the stator cooling jacket, and the frame is filled with a heat conductive resin.

[0005]

By the above means, the present invention operates as follows. (1) A stator cooling jacket that communicates with the frame cooling jacket is attached directly to the end surface of the stator core that is the source of heat, and this stator cooling jacket is the outer circumference of the stator coil that is the source of heat. The heat loss generated in the stator core and the stator coil is efficiently transmitted to the frame cooling jacket through the stator cooling jacket because the heat loss is located near the core cooling jacket. Also, by splitting the stator core in the axial direction and arranging the stator cooling jacket also in this split part, the heat loss generated in the stator core and the stator coil is lost even in the central part of the stator core. Since it is transferred to the frame cooling jacket through the stator cooling jacket, it is uniformly cooled in the axial direction of the stator, and the heat loss generated in the stator core and the stator coil is lost. Is more efficiently transmitted to the frame cooling jacket via. (2) By extending the stator cooling jacket provided on the stator core to the position of the tooth tip of the stator core, the heat loss of the stator coil is more efficiently transferred to the stator cooling jacket. Therefore, the heat loss generated in the stator core and the stator coil is transmitted very efficiently to the frame cooling jacket via the stator cooling jacket. (3) By connecting the coolant supply hole and the coolant discharge hole of the stator cooling jacket to the frame cooling jacket, it is not necessary to use an external coolant supply device to supply the coolant to the stator cooling jacket. (4) By connecting the refrigerant supply hole and the refrigerant discharge hole of the stator cooling jacket to an external refrigerant supply device, the amount of refrigerant supplied to the stator cooling jacket can be increased and the cooling capacity is improved. . (5) A heat conductive resin contacts the coil end of the stator coil, and this heat conductive resin contacts the stator cooling jacket and the frame. It is transmitted to the stator cooling jacket and the frame via the conductive resin, and is further favorably transmitted to the frame cooling jacket.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side sectional view of a high-speed motor showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a view corresponding to FIG. 2 showing another embodiment of the present invention. is there. In the figure, 1 is a high-speed motor, and 2 is a frame, which is composed of two layers. Inside, a frame cooling jacket 3 formed by spirally bending a hollow copper tube is provided. The frame cooling jacket 3 has a coolant supply port 4 for receiving a coolant from an external coolant supply device (not shown) at one end, and a coolant discharge port 5 for discharging the coolant to the external coolant supply device at the other end. Is provided. Reference numeral 6 denotes a stator fitted to the inner peripheral surface of the frame 2, and a stator core 8 having a plurality of slots 7 opening to the inner peripheral surface in the inner peripheral portion, and wound in the slot 7. It is composed of a stator coil 9. The stator core 8 is divided into at least two axial portions in the central portion, and ring-shaped stator cooling jackets 10a, 10b, 10c are provided on the divided portions and both end surfaces. These stator cooling jackets 10a, 10
b and 10c are refrigerant supply holes 11a and 1 on one side in the radial direction.
1b and 11c are provided, and the refrigerant discharge holes 12a and 12 are provided on the other side.
b and 12c are provided. The refrigerant supply holes 11a, 11
b, 11c and the refrigerant discharge holes 12a, 12b, 12c
Is communicated with the frame cooling jacket, and the refrigerant branches from the frame cooling jacket 3 and flows into the stator cooling jackets 10a, 10b, 10c. Although FIG. 3 shows only the stator cooling jacket 10a provided in the divided portion, the stator cooling jackets 10 provided at both axial ends of the stator core 8 are shown.
b and 10c also have the same configuration, and individual illustrations are omitted. Reference numeral 13a denotes a heat conductive resin filled in a space surrounded by the load side coil end 14a of the stator coil 9, the stator cooling jacket 10c, and the frame 2.
3b is a coil end 14b of the stator coil 9 opposite to the load side
And a heat conductive resin filled in a space surrounded by the stator cooling jacket 10b and the frame 2. 15a
Is a load side bracket fitted and fixed to the load side end of the frame 2, and 15b is a counter load side bracket fitted and fixed to the counter load side end of the frame 2. 16 is on the load side and anti-load side brackets 15a and 15b,
A rotor 18, which is rotatably supported by a load side bearing 17a and an anti-load side bearing 17b, is fitted and fixed to the inner peripheral surface of the stator 6 with a gap therebetween. In such a configuration, the high speed motor 1 is cooled as follows. First, a coolant is supplied to the frame cooling jacket 3 through the coolant supply port 4 by an external coolant supply device (not shown). The refrigerant supplied to the frame cooling jacket 3 flows in the spiral frame cooling jacket 3 toward the refrigerant outlet 5, and in this process, the stator coil 9 transmitted to the frame 2
The heat loss of the stator core 8 is removed (heat exchange is performed with the frame 2), and the high speed motor 1 is cooled. In addition, the refrigerant flowing in the frame cooling jacket 3 is provided at three points in the middle of the frame cooling jacket 3 at the refrigerant supply holes 11a and 1a.
Stator cooling jackets 10a, 1 through 1b, 11c
Branch into 0b and 10c. Stator cooling jacket 1
The refrigerant branched into 0a, 10b, and 10c flows toward the refrigerant discharge holes 12a, 12b, and 12c. The stator cooling jackets 10a, 10b, 10c are directly attached to the end surface of the stator core which is one of the heat generating sources, and
Since it is located near the outer peripheral portion of the stator coil 9 which is another source of heat generation, the stator cooling jackets 10a, 10b,
The refrigerant flowing in 10c efficiently takes away the heat loss generated in the stator core 8 and the stator coil 9. Stator core 8
And the refrigerant in the stator cooling jackets 10a, 10b, 10c, which has deprived the heat loss generated in the stator coil 9, returns to the inside of the frame cooling jacket 3 through the refrigerant discharge holes 12a, 12b, 12c. It joins with the refrigerant flowing in the frame cooling jacket 3. The combined refrigerant is
It returns to the external coolant supply device through the coolant discharge port 5. The refrigerant circulates between the refrigerant supply device and the high speed motor. In addition, the coil end 14 of the stator coil 9
a and 14b are in contact with the heat conductive resins 13a and 13b,
Since the heat conductive resins 13a and 13b are in contact with the stator cooling jackets 10b and 10c and the frame 2, the heat of the stator coil 9 also passes through the heat conductive resins 13a and 13b from the coil ends 14a and 14b. Is transmitted to the stator cooling jackets 10b, 10c and the frame 2,
Furthermore, it is satisfactorily transmitted to the frame cooling jacket 3.
Thereby, in the high-speed motor 1, the temperature distribution in the axial direction of the stator core 8 is made uniform, and the local temperature rise is suppressed. Further, since the heat conductive resins 13a and 13b further facilitate the heat conduction to the frame 2, the cooling effect of the entire high speed motor can be greatly improved. Further, as shown in FIG. 4, if the stator cooling jacket 10a is extended to the position of the tooth top 19 of the stator core 8, the heat loss of the stator coil is absorbed in the immediate vicinity, and Not only the cooling can be effectively performed, but also the heat generated by the rotor 18 facing through the air gap can be absorbed to cool the rotor. The present invention can be implemented by changing the configuration as follows. (1) The stator cooling jackets 10a, 10b, 10c
Refrigerant supply holes 11a, 11b, 11c and refrigerant discharge hole 12
The a, 12b, and 12c are communicated with an external refrigerant supply device. In this case, the amount of the refrigerant supplied to the high speed motor can be increased, so that the cooling capacity is further improved. (2) The stator cooling jackets 10a, 10b, 10c are C
It is configured in a letter shape, and the refrigerant is supplied from one end and the refrigerant is discharged from the other end. In this case, the stator cooling jacket 10
Since the refrigerant in a, 10b, and 10c flows smoothly,
The cooling capacity is further improved. (3) The stator cooling jacket 10 and the heat conductive resin 13 are
It is not always necessary to provide a plurality of locations, and any one location may be provided, and the heat conductive resin 13 may not be provided. However, in either case, the cooling capacity is improved over conventional high speed motors. (4) The frame cooling jacket 3 may be formed by forming a spiral groove on the surface of one frame of the two-layer frame that overlaps with the other frame. In this case, since the frame 2 constitutes the tube wall of the frame cooling jacket, the inner diameter of the frame cooling jacket can be increased without increasing the size of the high-speed motor, and the refrigerant flowing inside the motor can be prevented. You can increase the amount,
Cooling capacity is improved. Even if the frame is not a two-layer frame, a spiral groove may be formed on the inner peripheral surface of the one-layer frame, and the same frame cooling jacket may be embedded in the groove. Good. in this case,
The frame cooling jacket comes into direct contact with the outer peripheral surface of the stator core, which improves the cooling capacity.

[0007]

As described above, according to the present invention, the heat generated in the stator and further in the rotor is effectively radiated to the outside of the motor by providing the stator with the cooling jacket which constitutes the refrigerant passage. Therefore, there is an effect that stable high-speed rotation and a required output can be maintained.

[Brief description of drawings]

FIG. 1 is a side sectional view of a high speed motor showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a view corresponding to FIG. 2 showing another embodiment of the present invention.

[Explanation of symbols]

 1 Motor 2 Frame 3 Frame Cooling Jacket 4 Refrigerant Supply Port 5 Refrigerant Discharge Port 6 Stator 7 Slot 8 Stator Core 9 Stator Coil 10 Stator Cooling Jacket 11 Refrigerant Supply Hole 12 Refrigerant Discharge Hole 13 Thermal Conductive Resin 14 Coil End 15 bracket 16 rotating shaft 17 bearing 18 rotor 19 tooth tip

Claims (5)

[Claims] 1. A stator core provided with a plurality of slots for accommodating a stator coil in an inner peripheral portion thereof, and a rotor opposed to the inner peripheral surface of the stator core with a gap therebetween. In a motor provided with a frame on the outside of the stator core and a frame cooling jacket for passing a refrigerant between the stator core and the frame, at least one end of the stator core, or the stator core in the axial direction. Divided into multiple parts,
A motor cooling device comprising a ring-shaped or C-shaped stator cooling jacket. 2. The motor cooling device according to claim 1, wherein a stator cooling jacket provided on the stator core is extended to a position of a tip of the stator core. 3. The motor cooling device according to claim 1, wherein the cooling medium supply hole and the cooling medium discharge hole of the stator cooling jacket are communicated with the frame cooling jacket. 4. The cooling of the motor according to claim 1, wherein the cooling medium supply hole and the cooling medium discharge hole of the stator cooling jacket are communicated with an external cooling medium supply device. apparatus. 5. The thermally conductive resin is filled in a space surrounded by the coil end of the stator coil, the stator cooling jacket, and the frame, according to any one of claims 1 to 4. The cooling device for the motor according to 1.