JP2002165411A - Motor or generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor or a generator that can make an air gap between a stator core and a rotor small and that can prevent the occurrence of eddy currents in the stator core, in a motor or a generator structured, in such a way that a coil can directly be cooled with coolant paths formed around the coil. SOLUTION: A partition wall 10 that defines coolant paths 11 on the outside circumference of a coil 4, formed on the outside circumference of a stator core 3, is formed by a molded core. The partition wall 10 is mounted on mounting parts 1A, 1B of a cylindrical shape provided on a casing 1 via vibration- proof members 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a motor or a generator.

[0002]

2. Description of the Related Art For example, some motors and generators mounted on a vehicle are provided with a cooling structure for cooling heat generated by energizing a coil wound around a stator core. For example,
Japanese Patent No. 2716286 discloses that the opening of a slot in which a coil is wound in a stator core is sealed by filling with a resin material, a coolant passage is formed in the slot, and the coil comes into direct contact with the coolant to provide cooling. Is disclosed.

[0003]

However, when the cooling liquid passage is formed by filling the resin material in this manner, the air gap between the stator core and the rotor does not have to be wide because the resin layer protrudes toward the rotor. (For example, an air gap of 0.5 mm usually needs to be increased by 1 to 2 mm), and the performance of the motor deteriorates. On the other hand, if the coolant passage is defined by a metal member, the air gap between the stator core and the rotor can be reduced. However, an eddy current is generated in the stator core through the metal member, and the eddy current Causes performance degradation.

The present invention has been made in view of such a problem. In a motor or a generator in which a coil can be directly cooled by a coolant passage formed around the coil, the present invention relates to a motor or a generator provided between a stator core and a rotor. It is an object of the present invention to provide a device that can reduce the air gap and prevent the generation of eddy current in the stator core.

[0005]

According to a first aspect of the present invention, a rotor rotatable around a rotation axis, a stator core disposed to face the outer periphery of the rotor, and a coil wound around the stator core are provided. With a motor or generator with
A partition made of a material that is easy to transmit magnetism but has a small electric conductivity is attached between the coil side and the rotor side, and the coolant flows through a coolant passage defined around the coil by the partition. Thereby, the coil is directly cooled.

[0006] In the second invention, the material that easily conducts the magnetism but has a low conductivity is a dust core.

According to a third aspect of the present invention, there is provided a case accommodating the rotor and the stator core, and the partition is attached to the case via a vibration isolator.

[0008] In a fourth aspect, the partition is attached to a cylindrical attachment portion formed in a case accommodating the rotor and the stator core.

[0009]

According to the first and second aspects of the present invention, the partition walls defining the coolant passage are formed of a material which is easy to conduct magnetism but has a small electric conductivity (the dust core in the second aspect). Therefore, while the magnetic flux generated around the coil is well transmitted through the partition, no eddy current is generated in the stator core by the contact between the stator core and the partition. Further, unlike the case where the partition is formed by filling with a resin member, the partition can be easily positioned and attached, so that the air gap between the stator core and the rotor can be reduced. Therefore, in a motor or a generator having a structure in which a cooling liquid passage is formed around the coil to directly cool the coil, the performance can be improved while increasing the production efficiency.

[0010] In the third aspect, the partition is attached to the case via the vibration isolating member, so that the vibration isolating member acts as a cushioning member, so that stress is not concentrated on a specific portion of the partition, and the partition is damaged. Can be prevented. Furthermore, the vibration isolating member
It also acts as a seal member for the coolant passage.

In the fourth aspect, since the partition is attached to the cylindrical mounting portion, the partition can be securely fixed even when the case is thermally expanded due to a large change in the use environment temperature.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a motor or a generator according to an embodiment of the present invention.

As shown in the figure, the motor or the generator is configured by housing a rotor 2, a stator core 3, a coil 4 and the like in a case 1.

The rotor 2 is a cylindrical member, and is rotatably supported by the case 1 via bearings 5 and 6 on the rotating shaft 2A. The stator core 3 is an annular member, and is disposed coaxially with the rotor 2 so as to surround the outer periphery of the rotor 2. The coil 4 is wound around the stator core 3.

The inside of the case 1 is defined by the partition 10 on the rotor 2 side and the coil 4 side. Thereby, around the coil 4, the side surface of the partition 10 on the coil 4 side and the case 1
A cooling liquid flow path 11 surrounded by the inner peripheral surface of the cooling liquid is formed. The coolant (coolant) introduced from the coolant inlet 12 flows through the coolant channel 11. Thus, the coil 4 that has generated heat when energized is directly cooled. The cooling liquid is discharged from the cooling liquid discharge port 13 to the outside of the case 1.
A member made of a dust core, and attached to the cylindrical mounting portions 1A and 1B formed in the case 1, a vibration isolating member 14
And is disposed in contact with the inner peripheral surface of the stator core 3. FIG. 2 is an enlarged view showing a mounting state on the mounting portion 1B side. The partition 1
The shape of 0 is not particularly limited as long as it defines the coil 4 side and the rotor 2 side.

The dust core has a property that it can conduct magnetism well but cannot conduct electricity (it has a low conductivity). For this reason,
The magnetic field generated by energizing the coil 4 also works well on the rotor 2 separated by the partition 10,
An eddy current is not generated in the stator core 3 even by contact with the partition wall 10. In addition, the partition 10 is a case 1
At predetermined positions (in this embodiment, the mounting portions 1A, 1A,
Since it is positioned and fixed in B), the partition 10
Is provided, the air gap 15 between the rotor 2 and the stator core 3 does not increase, and the efficiency of the motor or the generator does not decrease. Therefore,
High performance of the motor or generator can be secured.

The mounting portions 1A and 1B are provided so as to protrude inside the case 1 so as to surround the bearings 5 and 6 that support the rotating shaft 2A of the rotor 2, respectively. By supporting the partition wall 10 with such cylindrical mounting portions 1A and 1B, the partition wall 10 can be securely fixed even when the use environment temperature is greatly changed and the case 1 is thermally expanded. .

The vibration isolating member 14 is a ring-shaped member having a predetermined width made of an elastic member such as rubber and fixed to the outer peripheral surfaces of the mounting portions 1A and 1B. On the vibration isolating member 14, the partition 1
Zero axial ends are fixed.

The vibration isolating member 14 serves as a cushioning member for preventing stress from being concentrated on a specific portion of the partition wall 10 due to vibration caused by driving of a motor or a generator, and also serves as a coolant passage by sealing an end of the partition wall 10. It functions as a seal member for preventing the coolant from leaking from 11 to the rotor 2 side. As described above, the partition 10 is formed of a dust core, but the dust core is obtained by hardening magnetic material powder by pressure and is relatively brittle.
For this reason, the partition 10 is supported via the vibration isolating member 14 to avoid stress concentration on a specific portion, thereby preventing the partition 10 from being damaged.

Next, the operation will be described.

The motor drives the rotor 2 to rotate around the rotating shaft 2A by energizing the coil 4 wound around the stator core 3. In addition, the generator generates an electric current in the coil 4 by rotating the rotor 2. The coil 4 that has generated heat by such an electric current is cooled by directly contacting the coolant with the coolant by flowing the coolant through the coolant passage 11. Therefore, a high cooling effect can be obtained.

In this case, a partition 10 is required to separate the periphery of the coil 4 through which the coolant flows from the rotor side.
The partition wall 10 is formed of a material that easily conducts magnetism but has low electrical conductivity, specifically, a dust core. Accordingly, while the magnetic flux generated around the coil 4 penetrates the partition wall 10 well, no eddy current is generated in the stator core 3 due to the contact between the stator core 3 and the partition wall 10.

The partition 10 is provided on the mounting portion 1 of the case 1.
The air gap 15 between the rotor 2 and the stator core 3 can be minimized without requiring any trouble in the installation, since it can be attached to the A, 1B and can be accurately positioned and attached. Therefore, high performance can be ensured while increasing the productivity of the motor or the generator.

Also, since the mounting portions 1A and 1B of the partition 10 are cylindrical, it is possible to securely fix the partition 10 even when the use environment temperature is greatly changed and the case 1 is thermally expanded. it can.

Since the partition 10 is attached to the mounting portions 1A and 1B via the vibration isolator 14, the vibration isolator 1
4 acts as a cushioning member, so that stress is not concentrated on a specific portion of the partition 10, and breakage of the partition 10 can be prevented. Further, the vibration isolating member 14 also functions as a seal member for the coolant passage 11.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a motor or a generator according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing how a partition is attached at an attachment portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 1A attachment part 1B attachment part 2 Rotor 2A Rotating shaft 3 Stator core 4 Coil 10 Partition wall 11 Coolant passage 14 Vibration isolation member

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yutaro Kaneko 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) 5H002 AA02 AA10 AC09 AD02 5H605 AA01 BB01 BB05 CC01 CC02 CC03 CC10 DD13 DD32 DD37 EA06 5H609 PP02 PP05 PP06 PP07 PP11 QQ05 QQ13 RR27 RR33 RR43

Claims (4)

[Claims] 1. A motor or a generator comprising: a rotor rotatable around a rotation axis; a stator core disposed to face an outer periphery of the rotor; and a coil wound around the stator core. A partition made of a material having a small electrical conductivity is attached between the coil side and the rotor side, and the coolant flows through a coolant passage defined around the coil by the partition. A motor or a generator, wherein the coil is directly cooled. 2. The motor or generator according to claim 1, wherein the material that easily conducts magnetism but has a low conductivity is a dust core. 3. The motor or generator according to claim 1, further comprising a case accommodating the rotor and the stator core, wherein the partition is attached to the case via a vibration isolator. . 4. The apparatus according to claim 1, wherein said partition wall is attached to a cylindrical attachment portion formed in a case accommodating said rotor and said stator core.
A motor or a generator according to any one of the preceding claims.