JP2001045701A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor with high cooling performance by reducing contact thermal resistance between the inner-periphery surface of a cooling jacket and the back surface of a stator iron core. SOLUTION: A rotor 5 and a stator iron core 6 faced each other via a clearance, and the rotor 5 and a stator 4 are covered with a frame 3. A cooling jacket 8 for passing a refrigerant for cooling the stator iron core 6 is formed between the frame 3 and the stator iron core 6. Through a inbt pipe 16 passing through the frame 3, a contact surface between the inner-periphery surface of the cooling jacket 8 and the back surface of the stator iron core 6 is injected with a charging material. Thus a gap is eliminated at the contact surface between the inner-periphery surface of the cooling jacket 8 and the back surface of the stator iron core 6, thereby enhancing heat conduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully-closed motor in which a main body applicable as a main motor of a vehicle or the like is covered with a frame.

[0002]

2. Description of the Related Art In recent years, the main motor of a vehicle has been completely covered with a frame or a shell or the like rather than an open type in which the starting portion is exposed to the outside, in order to reduce running costs and reduce noise. So-called fully-closed motors have become mainstream. This trend is not limited to vehicles, and similar demands have been placed on electric motors mounted on electric vehicles and hybrid cars. I am doing it.

[0003] In the case where the main motor for a vehicle is covered with a frame or the like, the heat generated inside the motor tends to stay in the frame. It also significantly reduces performance. Therefore, at present, a cooling jacket is provided between the stator core and the frame, and a cooling medium is passed through the cooling jacket to absorb heat generated by the rotor and the stator to cool the motor.

[0004]

However, even if a cooling jacket is provided between the frame and the stator core, a sufficient cooling effect may not be obtained depending on the mounting conditions. This is because there is a considerable gap in the contact surface between the back surface of the stator core and the inner peripheral surface of the cooling jacket, and the gap portion contains a gas such as air with low thermal conductivity. . In other words, since gas such as air has a low thermal conductivity, the contact thermal resistance at the contact surface between the back surface of the stator core and the inner peripheral surface of the cooling jacket increases, resulting in a problem that the cooling performance decreases. .

An object of the present invention is to provide a motor having a high cooling performance in which the contact thermal resistance between the inner peripheral surface of the cooling jacket and the back surface of the stator core is reduced.

[0006]

According to a first aspect of the present invention, there is provided an electric motor in which a stator core having an armature coil housed in a plurality of slots is opposed to an inner peripheral surface of the stator core via a gap. And a frame provided outside the stator core, and a cooling jacket provided between the frame and the stator core for flowing a coolant for cooling the stator core. And an introduction pipe provided through the frame to inject a filler into a contact surface between an inner peripheral surface of the cooling jacket and a back surface of the stator core.

In the electric motor according to the first aspect of the present invention, the rotor and the stator core are provided to face each other with a gap therebetween, the rotor and the stator are covered with a frame, and a coolant for cooling the stator core is provided. A cooling jacket for flowing is provided between the frame and the stator core. Then, a filler is injected into a contact surface between the inner peripheral surface of the cooling jacket and the back surface of the stator core from an introduction pipe provided through the frame. This eliminates a gap at the contact surface between the inner peripheral surface of the cooling jacket and the back surface of the stator core, thereby improving heat conduction.

A motor according to a second aspect of the present invention is the electric motor according to the first aspect, wherein a circumferential groove is formed on an inner peripheral surface of the cooling jacket.

In the electric motor according to the second aspect of the present invention, in addition to the operation of the first aspect, the filler is guided and injected into a circumferential groove formed on the inner peripheral surface of the cooling jacket.

A motor according to a third aspect of the present invention is the electric motor according to the first aspect, wherein an axial groove is formed on an inner peripheral surface of the cooling jacket.

[0011] In the electric motor according to the third aspect of the present invention, in addition to the operation of the first aspect, the filler is guided and injected into the axial groove formed on the inner peripheral surface of the cooling jacket.

A motor according to a fourth aspect of the present invention is the electric motor according to the first aspect, wherein grooves are formed in the inner peripheral surface of the cooling jacket in a circumferential direction and an axial direction.

According to a fourth aspect of the present invention, in addition to the operation of the first aspect, the filler is guided and injected into circumferential and axial grooves formed on the inner peripheral surface of the cooling jacket. You.

According to a fifth aspect of the present invention, in the electric motor of the first aspect, a circumferential groove is formed on a back surface of the stator core.

In the electric motor according to the fifth aspect of the present invention, in addition to the operation of the first aspect, the filler is guided and injected into a circumferential groove formed on the back surface of the stator core.

According to a sixth aspect of the present invention, in the electric motor of the first aspect, an axial groove is formed on a back surface of the stator core.

In the electric motor according to the sixth aspect of the invention, in addition to the operation of the first aspect, the filler is guided and injected into an axial groove formed on the back surface of the stator core.

A motor according to a seventh aspect of the present invention is the electric motor according to the first aspect, wherein grooves are formed in a circumferential direction and an axial direction on a back surface of the stator core.

In the electric motor according to the seventh aspect of the present invention, in addition to the operation of the first aspect, the filler is guided and injected into circumferential and axial grooves formed on the back surface of the stator core. .

An electric motor according to an eighth aspect of the present invention is the electric motor according to the first aspect, wherein grooves are formed circumferentially or axially on an inner peripheral surface of the cooling jacket and a back surface of the stator core. .

In the electric motor according to the eighth aspect of the present invention, in addition to the operation of the first aspect, the filler is formed in a circumferential or axial groove formed on the inner peripheral surface of the cooling jacket and the back surface of the stator core. It is guided and injected.

According to a ninth aspect of the present invention, in the electric motor according to the first aspect of the present invention, a foil-like sheet having a higher thermal conductivity than the in-machine gas is wound on the back surface of the stator core, and is wound around the inner peripheral surface of the cooling jacket. It is characterized by being fitted.

In the electric motor according to the ninth aspect of the present invention, in addition to the function of the first aspect of the present invention, a foil-like sheet having a high thermal conductivity wound on the back surface of the stator core can be used to cover the inner peripheral surface of the cooling jacket. Improves heat conduction and promotes heat radiation to the outside.

A motor according to a tenth aspect of the present invention is the electric motor according to the first aspect, wherein a jig for rotating the stator core when the cooling jacket is fitted can be attached to the end of the stator core. Is provided.

In the motor according to the tenth aspect of the present invention, in addition to the operation of the first aspect, a jig is attached to the mechanism at the end of the stator core, and the stator core is rotated when the cooling jacket is fitted. As a result, the filler is uniformly injected into the contact surface between the inner peripheral surface of the cooling jacket and the back surface of the stator core.

[0026]

Embodiments of the present invention will be described below. FIG. 1 is an axial cross-sectional view of an electric motor according to an embodiment of the present invention. FIG. 1 shows a permanent magnet motor as the motor 1.

In FIG. 1, the electric motor 1 is formed by arranging a cylindrical rotor 5 and a stator 4 to face each other with a gap therebetween. The rotor 5 and the stator 4 are covered with the frame 3 to form a closed electric motor. The stator 4 includes a stator core 6
The stator coil 7 is formed by annularly arranging the
Is disposed inside the stator 4 and is rotatably supported by a bearing 9 via a rotating shaft 10.

Between the frame 3 and the stator core 6, there is provided a cooling jacket 8 through which a coolant for cooling the stator core 6 flows. Into the cooling jacket 8, a refrigerant is introduced into the refrigerant supply port 14 from an external refrigerant supply device,
The refrigerant passes through the cooling jacket 8 and the inner surface 1 of the jacket.
1 cools the back surface of the stator core 6 through the refrigerant outlet 1
5 is returned to the refrigerant supply device.

An introduction pipe 16 is provided through the frame 3 and the cooling jacket 8 so that a filler can be injected into a contact surface between the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6. I have. That is, the introduction pipes 16 are connected from the outside to the contact surface between the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6, and are provided in a predetermined number in the circumferential direction and the lateral direction of the electric motor 1. FIG. 1 shows the motor 1 provided at three places in the lateral direction. The introduction pipe 16 is closed with a set screw 17 during operation of the electric motor 1.

FIG. 2 is a longitudinal sectional view taken along the line AA of FIG. The stator 4 has a structure in which a stator coil 7 is annularly arranged on a stator core 6. The stator 4 is directly fixed to an inner peripheral surface of a cooling jacket 8 provided inside the frame 3. I have.

On the other hand, the rotor 5 has four semi-arrow-shaped cavities 13 spaced apart from each other by a magnetic pole width, and a permanent magnet 12 having a rectangular cross section is fixed to the side surface of the magnetic pole portion. That is, the rotor 5 constitutes a quadrupole rotor in which the iron core portion between the hollow portions 13 is a magnetic pole portion. Then, in order to form magnetic irregularities between the magnetic pole portion and the portion between the magnetic poles, a permanent magnet 12 having a rectangular cross section is provided on each cavity 13 on a side surface of the magnetic pole portion (a circumferential end surface of the cavity), for example. It is fixed with adhesive.

Here, the rotor 5 is made of a cylindrical mild steel S45.
The permanent magnet 12 is made of a magnetic material such as C or a laminated circular silicon steel plate. As a material of the permanent magnet 12, a rare earth magnet having a high magnetic energy product, for example, an NdFeB magnet is used.
Thereby, higher torque can be obtained more effectively than the conventional permanent magnet.

As can be seen from FIG. 2, the introduction pipes 16 connected to the contact surface between the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6 are provided at four places in the circumferential direction of the electric motor 1. When the filler is injected from the introduction pipe 16 to the contact surface between the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6, the set screws 17 of the two opposed introduction pipes 16 are filled.
Is removed, and a joint 18 for connecting an exhaust pipe is connected. Then, the introduction pipe 16 and an exhaust device (not shown) are connected through the joint 18 to reduce the pressure in the gap between the inner peripheral surface of the cooling jacket and the back surface of the stator core 6.

Similarly, the remaining two opposite introduction pipes 16
The set screw 17 is removed, and a thermally conductive filler (resin, grease, etc.) having a higher thermal conductivity than the gas existing in the gap is pressurized by a filler supply mechanism (not shown) through the joint 18 while applying pressure. Fill. Then, the introduction pipe 16 is closed with the set screw 17.

FIG. 3 is a sectional view of a portion of the introduction pipe 16 connected to the contact surface between the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6. By this filling operation, the in-machine gas having low thermal conductivity in the gap of the cooling jacket inner wall 11 and causing the thermal resistance can be replaced with a filler having high thermal conductivity. Thereby, the cooling jacket inner wall surface 1
1 can be reduced, and the cooling performance of the electric motor can be improved.

The inner peripheral surface of the cooling jacket 8 and the stator core 6
The operation of filling the gap between the cooling motor 8 and the rear surface is performed conservatively not only when the electric motor 1 is manufactured but also when the cooling performance of the cooling jacket 8 is reduced. This makes it possible to reduce the thermal resistance of the contact surface of the cooling jacket 8.

FIG. 4 is a perspective view showing the inner wall surface (No. 1) of cooling jacket 8 in the embodiment of the present invention.
FIG. 4 shows only a half of the jacket inner wall 11 on the stator core 6 side of the cooling jacket 8 in the axial direction for easy understanding of the inside.

The jacket inner wall 11 of the cooling jacket 8 is formed in a cylindrical shape, and this jacket inner wall 11 contacts the back surface of the stator core 6. A circumferential groove 22 is formed on the inner peripheral surface of the jacket inner wall 11. The filler is guided by the circumferential groove 22 and injected into the contact surface between the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6. Thereby, the entire contact surface can be uniformly filled.

FIG. 5 is a perspective view showing the inner wall surface (part 2) of cooling jacket 8 in the embodiment of the present invention.
An axial groove 23 is provided on the inner peripheral surface of the jacket inner wall 11 instead of the circumferential groove 22 shown in FIG. Also in this case, since the axial groove 23 is formed, when the filler is filled, the filler contacts the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6 through the axial groove 23. The entire surface can be filled uniformly.

FIG. 6 is a perspective view showing the inner wall surface (No. 3) of cooling jacket 8 in the embodiment of the present invention.
An axial groove 23 is provided on the inner peripheral surface of the jacket inner wall 11 in addition to the circumferential groove 22 shown in FIG. Also in this case, since the circumferential groove 22 and the axial groove 23 are formed, when the filler is filled, the cooling jacket 8 is filled with the filler through the circumferential groove 22 and the axial groove 23.
Can be uniformly filled on the entire contact surface between the inner peripheral surface of the stator core and the back surface of the stator core 6.

FIG. 7 is a partial perspective view of the stator 4 (No. 1) according to the embodiment of the present invention. FIG. 7 shows only a part of the stator 4 in order to make the back surface of the stator core 6 easy to understand. The stator 4 is configured such that a stator coil 7 is annularly arranged on a stator core 6.

As in the case of the inner peripheral surface of the cooling jacket 8 shown in FIG.
2 are formed. Therefore, when filling the contact surface between the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6 with a filler such as a thermally conductive resin, the filler is guided and injected into the circumferential groove 22. Thus, the entire contact surface between the inner peripheral surface of cooling jacket 8 and the back surface of stator core 6 can be uniformly filled.

FIG. 8 is a partial perspective view of the stator 4 (No. 2) according to the embodiment of the present invention. An axial groove 23 is provided on the back surface of the stator core 6 instead of the circumferential groove 22 shown in FIG. Also in this case, since the axial groove 23 is formed, when the filler is filled, the filler is guided into the axial groove 23 and injected. Therefore, the entire contact surface between the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6 can be uniformly filled.

FIG. 9 is a partial perspective view of the stator 4 (No. 3) according to the embodiment of the present invention. An axial groove 23 is provided on the back surface of the stator core 6 in addition to the circumferential groove 22 shown in FIG. Also in this case, since the circumferential groove 22 and the axial groove 23 are formed, when the filler is filled, the filler is filled with the circumferential groove 22 and the axial groove 2.
It is guided to 3 and injected. Therefore, the cooling jacket 8
Can be uniformly filled on the entire contact surface between the inner peripheral surface of the stator core and the back surface of the stator core 6.

In the above description, the circumferential groove 22 or the axial groove 23 is provided on the inner peripheral surface of the cooling jacket 8 or the back surface of the stator core 6, but the inner peripheral surface of the cooling jacket 8 and the stator are not provided. A circumferential groove 2 is provided on both sides of the
It is also possible to form two or axial grooves 23. Also in this case, when a filler such as a thermally conductive resin is filled, the filler is contacted with the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6 through the circumferential groove 22 or the axial groove 23. The whole can be filled uniformly.

Next, as shown in FIG.
Foil-like sheet 24 having a higher thermal conductivity than the gas inside the machine
May be wound. In the gap between the inner peripheral surface of the cooling jacket 8 and the back of the stator core 6, a foil-like sheet (such as aluminum foil) having a higher thermal conductivity than the gas existing in the gap is provided on the back of the stator core 6. Wind several times. After that, it is fitted to the inner peripheral surface of the jacket inner wall 11.

As a result, even if there are some irregularities on the back surface of the stator core 6, the heat conductive foil sheet 24 enters the recesses, so that the inner peripheral surface of the cooling jacket 8 and the stator core 6 It is possible to reduce the thermal resistance between the rear surface and the cooling performance.

As shown in FIG. 11, the stator core 6
A mechanism capable of attaching a jig 25 for rotating the stator to the end of the stator core 6 may be provided. That is, the jig 25 is attached to the mechanism at the end of the stator core 6, and the stator core 6 is rotated when fitted to the cooling jacket 8. Thereby, the filler can be uniformly injected into the contact surface between the inner peripheral surface of the cooling jacket 8 and the back surface of the stator core 6.

In FIG. 11, a mechanism capable of attaching a jig 25 for rotating the stator core 6 when the stator core 6 is fitted to the cooling jacket 8 is provided at the end of the stator core 6. By this jig 25, the filling operation can be performed while rotating the stator core 6, and the filling material can be easily filled uniformly over the entire contact surface.

In the case of the stator core 6 on which a foil sheet 24 (such as aluminum foil) having a high thermal conductivity is wound, the stator core 6 is rotated in the direction opposite to the winding direction of the foil sheet ( Since the sheet wound on the back of the stator core 6 can be fitted without loosening), the cooling jacket 8
It is possible to reduce the thermal resistance between the stator core 6 and the back surface of the stator core 6, thereby improving the cooling performance.

[0051]

As described above, according to the present invention, the introduction pipe is provided to connect the contact surface between the inner peripheral surface of the cooling jacket and the back surface of the stator core, so that it is fixed to the inner peripheral surface of the cooling jacket. It is possible to fill a gap between the core and the back surface of the core with a thermally conductive filler having high thermal conductivity. Thereby, the thermal resistance of the cooling jacket contact surface can be reduced and the cooling performance can be improved.

When grooves are formed in the circumferential direction or axial direction of the inner circumferential surface of the jacket, or when grooves are formed in the circumferential direction or axial direction on the back surface of the stator core, the filler is cooled through these grooves. The entire inner peripheral surface of the jacket can be uniformly filled. Thereby, the thermal resistance of the cooling jacket contact surface can be reduced and the cooling performance can be improved.

Further, since a foil-like sheet having a high thermal conductivity is wound on the back surface of the stator core, the thermal resistance of the contact surface of the cooling jacket can be reduced and the cooling performance can be improved. In addition, a jig for rotating the stator core can be attached to the end of the stator core at the time of fitting with the cooling jacket 8, so that the fitting can be performed while rotating the stator core. The material can uniformly fill the entire inner peripheral surface of the cooling jacket.

[Brief description of the drawings]

FIG. 1 is an axial cross-sectional view of an electric motor according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of an introduction pipe portion connected to a contact surface between an inner peripheral surface of a cooling jacket and a back surface of a stator core according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing an inner wall surface (No. 1) of the cooling jacket according to the embodiment of the present invention.

FIG. 5 is a perspective view showing an inner wall surface (part 2) of the cooling jacket according to the embodiment of the present invention.

FIG. 6 is a perspective view showing an inner wall surface (part 3) of the cooling jacket according to the embodiment of the present invention.

FIG. 7 is a partial perspective view of a stator (No. 1) according to the embodiment of the present invention.

FIG. 8 is a partial perspective view of a stator (part 2) according to the embodiment of the present invention.

FIG. 9 is a partial perspective view of a stator (part 3) according to the embodiment of the present invention.

FIG. 10 is a perspective view when a foil sheet is wound around the back surface of the stator core according to the embodiment of the present invention.

FIG. 11 is a perspective view when a jig is attached to an end of a stator core according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 3 Frame 4 Stator 5 Rotor 6 Stator iron core 7 Stator coil 8 Cooling jacket 9 Bearing 10 Rotating shaft 11 Jacket inner wall 12 Permanent magnet 13 Cavity part 14 Refrigerant supply port 15 Refrigerant discharge port 16 Inlet pipe 17 Stop screw 18 Joint 22 Circumferential groove 23 Axial groove 24 Foil sheet 25 Jig

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuto Sakai 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside Keihin Works, Toshiba Corporation (72) Norio Takahashi 2-chome, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa 4 Toshiba Keihin Works Co., Ltd. (72) Inventor Mikio Takahata 2-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa F-term (reference) 5H605 AA01 BB05 BB17 CC01 DD03 DD11 DD33 EB10 FF06 5H609 BB19 PP02 PP05 PP06 PP07 PP08 PP09 QQ01 QQ13 QQ23 RR27 RR35 RR46 RR58 RR69 RR70

Claims (10)

[Claims] 1. A stator core having an armature coil stored in a plurality of slots, a rotor provided on an inner peripheral surface of the stator core with a gap therebetween, and an outer side of the stator core. And a cooling jacket provided between the frame and the stator core for flowing a coolant for cooling the stator core, and a cooling jacket provided through the frame to provide the cooling jacket. An electric motor comprising: an introduction pipe for injecting a filler into a contact surface between an inner peripheral surface and a back surface of the stator core. 2. The electric motor according to claim 1, wherein a circumferential groove is formed on an inner peripheral surface of the cooling jacket. 3. The electric motor according to claim 1, wherein an axial groove is formed on an inner peripheral surface of the cooling jacket. 4. The electric motor according to claim 1, wherein grooves are formed in an inner peripheral surface of the cooling jacket in a circumferential direction and an axial direction. 5. The electric motor according to claim 1, wherein a circumferential groove is formed on a back surface of the stator core. 6. The electric motor according to claim 1, wherein an axial groove is formed on a back surface of the stator core. 7. The electric motor according to claim 1, wherein grooves are formed in a circumferential direction and an axial direction on a back surface of the stator core. 8. The electric motor according to claim 1, wherein a groove is formed in an inner peripheral surface of the cooling jacket and a back surface of the stator core in a circumferential direction or an axial direction. 9. The cooling jacket according to claim 1, wherein a foil-like sheet having higher thermal conductivity than the in-machine gas is wound around the back surface of the stator core and fitted to the inner peripheral surface of the cooling jacket. Electric motor. 10. The electric motor according to claim 1, further comprising a mechanism capable of attaching a jig for rotating the stator core to the end of the stator core when the cooling jacket is fitted. .