JPH09261901A - Permanent magnet dynamo-electric machine and motor-driven vehicle using the machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet dynamo-electric machine which is capable of rotating at a high speed and a motor-driven vehicle using the machine. SOLUTION: This dynamo-electric machine is provided with a stator 20 having stator iron core 22 on which a stator winding 24 is wound, a rotor 30 which is rotatably-retained on the inner periphery of the stator 20 and has a rotor iron core 32 and a plurality of permanent magnets 36 disposed inside the rotor iron core 32 facing the stator iron core. The ratio (R1/R0) of radius R0 of the stator 30 to a distance from the center of the rotor 30 to the position of the permanent magnet 36 on inner periphery side is set to be greater than 0.85.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet rotating electric machine and an electric vehicle using the same, and more particularly to a permanent magnet rotating electric machine suitable for an internal magnet type rotating electric machine and an electric vehicle using the same.

[0002]

2. Description of the Related Art A drive motor used in an electric vehicle, particularly an electric vehicle, has a limited amount of batteries to be loaded as the electric vehicle, and the battery capacity can ensure a sufficient one-charge traveling distance. To be necessary
Small size, light weight, and high efficiency are desired.

In order to reduce the size and weight of the electric motor, it is required to be suitable for high speed rotation. Further, as the high-efficiency motor, a permanent magnet motor can be recommended rather than a DC motor or an induction motor. In particular, a so-called internal magnet motor having a higher magnetic permeability than a permanent magnet, for example, a so-called internal magnet motor having a permanent magnet holding portion in a silicon steel plate is suitable as compared with a surface magnet motor in which a permanent magnet is arranged on the outer circumference of a rotor. There is. This is because the internal magnet permanent magnet motor can be operated at a high speed by the field weakening control and can be made highly efficient by the field weakening control. Furthermore, in order to reduce the size and weight of the electric motor, it is essential to use a high-performance permanent magnet. But,
Since high-performance permanent magnets are expensive, it is necessary to limit the amount used. On the other hand, in order to limit the amount of permanent magnets used, it is necessary to increase the number of poles. As a conventional example of this type of electric motor, for example, Japanese Patent Laid-Open No. 5-76146
As described in Japanese Patent Publication No. JP-A-2003-264, it is known that a rotor has a built-in 8-pole permanent magnet.

[0004]

However, in the one disclosed in Japanese Patent Laid-Open No. 5-76146, since the weight of the magnetic pole pieces located on the outer periphery of the permanent magnet that receives the centrifugal force is large, the magnetic pole pieces are located at both ends of the magnetic pole pieces. It is necessary to increase the radial thickness of the bridge portion, which does not consider high speed rotation.

An object of the present invention is to provide a permanent magnet rotating electric machine capable of high speed rotation and an electric vehicle using the same.

[0006]

In order to achieve the above object, the present invention provides a stator having a stator core around which a stator winding is wound, and is rotatably held on the inner circumference of the stator. ,
A permanent magnet rotating electric machine comprising a rotor core and a rotor having a plurality of permanent magnets arranged inside the rotor core so as to face the stator core, and a radius R0 of the rotor, The ratio (R1 / R0) of the distance R1 from the center of the rotor to the position on the inner circumference side of the permanent magnet is 0.85.
With such a configuration, leakage magnetic flux can be reduced, and the rotating electric machine can be made smaller and lighter.
Therefore, it becomes possible to rotate at high speed.

In the above permanent magnet rotating electric machine, preferably, the thickness of the permanent magnet is set to be not more than twice the thickness R2 of the bridge portion which is the narrowest portion of the rotary core on the outer peripheral side of the permanent magnet. However, with such a configuration, it is possible to cope with speeding up.

In the permanent magnet rotating electric machine, preferably, there is an air hole formed on the inner peripheral side of the permanent magnet and communicating with the rotating iron core. With such a structure, the rotating electric machine is lightweight. Since it is possible to increase the amount of magnetic flux and to increase the amount of magnetic flux, high-speed rotation is possible.

In the permanent magnet rotating electric machine, preferably, holes are formed in the circumferential direction of the permanent magnet, and such a configuration can reduce generation of pulsating torque and cogging torque.

In the permanent magnet rotating electric machine, preferably, the permanent magnet is inserted into a permanent magnet insertion hole formed in the rotor core, and the permanent magnet insertion hole is formed between the insertion hole of the rotor core and the outer periphery of the permanent magnet. The resin is inserted into the gap, and with this configuration, the contact of the permanent magnet with the rotor core can be alleviated.

In the above permanent magnet rotating electric machine, preferably, a slit is formed in the circumferential direction of the permanent magnet, and such a configuration facilitates positioning of the permanent magnet.

In order to achieve the above object, a stator having a stator core around which a stator winding is wound, and a stator core rotatably held on the inner circumference of the stator core A permanent magnet rotating electric machine comprising a rotor having a plurality of permanent magnets arranged facing the stator core inside, and a permanent magnet rotating electric machine whose wheels are driven by the permanent magnet rotating electric machine. In the electric vehicle used, in the permanent magnet rotating electric machine, the ratio (R1 / R0) of the radius R0 of the rotor and the distance R1 from the center of the rotor to the position on the inner peripheral side of the permanent magnet is 0. It is designed to be larger than 85, and by such a configuration, the one-charge traveling distance of the electric vehicle can be lengthened.

[0013]

DETAILED DESCRIPTION OF THE INVENTION A permanent magnet rotating electric machine according to an embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 3. FIG. 1 is a partial cross-sectional view of a permanent magnet rotating electric machine according to an embodiment of the present invention as seen from the front side.
FIG. 3 is a cross-sectional view of the permanent magnet rotating electric machine according to the embodiment of the present invention, showing the AA cross section of FIG. 1, and FIG. 3 is an enlarged view of a main part of FIG. 2.

In FIG. 1, the stator 20 of the rotary electric machine 10 is shown.
Is composed of a stator core 22, a multi-phase stator winding 24 wound around the stator core 22, and a housing 26 that holds the stator core 22 on its inner peripheral surface.
The rotor 30 includes a rotor core 32 and a permanent magnet 36 inserted into a permanent magnet insertion hole 34 provided in the rotor core 32.
And a shaft 38. Shaft 38
Are rotatably held by bearings 42 and 44. The bearings 42 and 44 are the end bracket 4
6 and 48, and the end bracket 4
6 and 48 are fixed to both ends of the housing 26.

A magnetic pole position detector PS for detecting the position of the permanent magnet 36 of the rotor 30 and an encoder E for detecting the position of the rotor 30 are arranged on the side surface side of the rotor 30. The rotary electric machine 10 is operation-controlled by a control device (not shown) by the signal of the magnetic pole position detector PS and the output signal of the encoder E.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, but the illustration of the housing is omitted. In FIG.
The rotary electric machine 10 includes a stator 20 and a rotor 30. The stator 20 includes a stator core 22 and a stator winding 24. The stator winding 24 is the stator core 2
It is wound around 2.

The rotor 30 is a high permeability magnetic material,
For example, a rotor core 32 in which a plurality of silicon steel plates are laminated, eight permanent magnets 36 inserted in eight permanent magnet insertion holes 34 provided in the rotor core 32, and a shaft 38 are configured. Has been done. The eight permanent magnets 36 are arranged at equal intervals in the circumferential direction of the rotor core 32 so that their polarities are opposite to each other.

The rotor core 32 has a structure in which a hole through which the permanent magnet insertion hole 34 and the shaft 38 pass is punched out. The permanent magnet insertion hole 34 and the hole for passing the shaft 38 are punched out, laminated with silicon steel plates, and penetrated through the permanent magnet insertion hole 34.
The permanent magnet 36 and the shaft 38 are inserted into the holes through which the shaft 38 passes and the rotor 30 is configured.

The permanent magnet rotor 30 rotates in the direction of the arrow (counterclockwise) and operates as an electric motor. The permanent magnet 36 used has a rectangular parallelepiped shape.

Next, the detailed structure of the rotor will be described with reference to FIG.

When the rotor core 32 is divided in the radial direction, it is divided into an inner peripheral yoke portion 32A and an outer peripheral portion 32B.
Further, when the outer peripheral portion 32B of the rotor core 32 is divided into three portions in the circumferential direction, the magnetic pole piece portion 32B1 and the auxiliary magnetic pole piece portion 3 are formed.
2B2 and a bridge portion 32B3. The magnetic pole piece portion 32B1 is a region located on the outer peripheral side of the permanent magnet 36 in the outer peripheral portion 32B of the rotor iron core 32, and is the permanent magnet 3
In this region, the magnetic flux Bφ from 6 flows to the stator 20 side through the gap to form a magnetic circuit. Auxiliary pole piece 32
B2 is a region sandwiched between the magnetic pole piece portions 32B1,
This is a region that bypasses the magnetic circuit of the magnet and directly generates magnetic flux on the stator side by the magnetomotive force of the stator. The bridge portion 32B3 includes a magnetic pole piece portion 32B1 and an auxiliary magnetic pole piece portion 32.
This is the boundary with B2, and the outer circumference of the permanent magnet 36 is the closest to the outer circumference of the rotor core 32.

With the above configuration, the control device (not shown) controls the composite vector of the armature magnetomotive force generated by the current flowing through the stator winding 24 so as to be oriented in the rotational direction from the center position of the auxiliary magnetic pole portion 32B2. By rotating electric machine 1
0 indicates the auxiliary magnetic pole portion 32 in addition to the torque generated by the permanent magnet 36.
A torque due to B2 can be generated, and the motor can be operated as a high torque electric motor.

Since the shape of the permanent magnet is a rectangular parallelepiped, the dimensional accuracy can be secured and the bridge portion 32B3 and the like can be made more accurate than the arc-shaped magnet, so that the rotor balancing work can be performed. Can be subjected to high speed rotation without.

The present embodiment is characterized by the arrangement position of the permanent magnet 36 in the permanent magnet rotating electric machine. When the radius of the rotor 30 is R0 and the distance from the center of the rotor 30 to the position on the inner peripheral side of the permanent magnet 36 is R1, the ratio (R1 / R0) is larger than 0.85.

A permanent magnet insertion hole 34 is formed in the rotor core 30 for inserting the permanent magnet 36. When the permanent magnet 36 is inserted into the permanent magnet insertion hole 34 and the rotor 30 rotates, a centrifugal force is generated. Of the centrifugal force generated by the entire rotor 30, the permanent magnet 36 and the outer periphery of the permanent magnet 36 are included. Centrifugal force generated by the magnetic pole piece portion 32B1 existing in 2) is concentrated on the bridge portion 32B3. Therefore, the centrifugal force generated by this permanent magnet is half the centrifugal force generated by the entire rotor 30.
The arrangement position of the permanent magnet 36 is set so as to be smaller. As a result, the radius R0 of the rotor 30 and
By setting the ratio (R1 / R0) of the distance R1 from the center of the rotor 30 to the position on the inner circumferential side of the permanent magnet 36 to be larger than 0.85, the centrifugal force generated by the permanent magnets can be reduced. It can be made smaller than 1/2 of the centrifugal force generated by.

As described above, since the centrifugal force generated by the permanent magnet 36 can be reduced by setting the arrangement position of the permanent magnet 36, the radial thickness R2 of the bridge portion 32B3 on which the centrifugal force acts most can be set. Can be shortened. When the radial thickness R2 of the bridge portion 32B3 is increased, the magnetic flux generated from the permanent magnet 36 is generated.
Since the leakage magnetic flux BL leaks via 2B3, the torque generated by the rotating electric machine is reduced. Leakage magnetic flux BL
However, if the torque to be generated is to be set to a predetermined value, the rotating electric machine itself must be increased in size, and high speed cannot be achieved.

However, as described above, the rotor 3
The ratio (R1 / R0) of the radius R0 of 0 and the distance R1 from the center of the rotor 30 to the position on the inner peripheral side of the permanent magnet 36 is 0.8.
By making it larger than 5, the centrifugal force generated by the permanent magnet 36 can be made smaller than 1/2 of the centrifugal force generated by the entire rotor 30, so that the radial thickness R2 of the bridge portion 32B3 can be reduced. Since it can be narrowed, the leakage magnetic flux BL can be reduced and the generated torque is not reduced.
As a result, speeding up can be achieved.

In the embodiment shown in FIG. 3, the radius R0 of the rotor 30 is 57.5 mm, and the rotor 30 is
Distance R1 from the center of the position to the position on the inner circumference side of the permanent magnet 36
Is 49.5 mm. As a result, the ratio (R1 / R0) of the radius R0 of the rotor 30 and the distance R1 from the center of the rotor 30 to the position on the inner peripheral side of the permanent magnet 36 is 0.86.
It has become. The radial thickness R of the permanent magnet 36 is
3 is 4 mm, the maximum radial thickness R4 of the magnetic pole piece portion 32B1 is 4 mm, and at that time, the bridge portion 32
The radial thickness R2 of B3 is 2 mm.

Since the centrifugal force generated by the permanent magnet 36 and the magnetic pole piece portion 32B1 existing on the outer periphery of the permanent magnet 36 is set to be less than 1/2 of the centrifugal force generated by the entire rotor 30, the bridge portion 32B3. Thickness R2 is 2
Even in mm, the bridge portion 32B3 is not broken by the centrifugal force, and the thickness R2 of the bridge portion 32B3 can be reduced. As a result, the leakage magnetic flux from the bridge portion 32B3 can be reduced, so that the generated torque can be increased. Therefore, since the size of the rotating electric machine can be reduced in size and weight, the rotating electric machine can rotate at high speed.

By the way, in the example illustrated in the abstract on page 1 of Japanese Patent Laid-Open No. 5-76146, the value corresponding to R1 / R0 is (2.1 / 2.9) = 0.72, The centrifugal force generated at this time is about 1.5 in the case shown in FIG. 3 of the present application.
Since it will be doubled, we have to increase the thickness of the bridge part,
As a result, the leakage magnetic flux also increases and the generated torque decreases, which is not suitable for speeding up.

Furthermore, the thickness of the permanent magnet can be made as fast as possible if it is as thin as possible. In particular, as shown,
The thickness R3 of the permanent magnet 36 is set to the thickness R2 of the bridge portion 32B3.
It is possible to provide a high-speed permanent magnet rotating electric machine by setting the ratio to 2 times or less.

According to the present embodiment, since the leakage magnetic flux can be reduced, it is possible to prevent the torque generated in the internal permanent magnet rotary electric machine from being reduced, and as a result, the rotary electric machine can be made smaller and lighter, so that the rotary electric machine can rotate at a high speed. Becomes

Next, a permanent magnet rotating electric machine according to another embodiment of the present invention will be described with reference to FIG. FIG.
FIG. 7 is a sectional view of a rotor of a permanent magnet rotating electric machine according to another embodiment of the present invention. The entire structure of the rotary electric machine according to the present embodiment is as shown in FIG. 1, and the structure of the stator is as shown in FIG.

In FIG. 4, the rotor 30 of the rotating electric machine is
A high-permeability magnetic material, for example, a rotor core 32 in which a plurality of silicon steel plates are laminated, and eight permanent magnets inserted into eight permanent magnet insertion holes 34 provided in the rotor core 32. It is composed of a magnet 36 and a shaft 38. 8
The individual permanent magnets 36 are arranged at equal intervals in the circumferential direction of the rotor core 32 so that their polarities are opposite to each other.

Further, the same number of air holes 39 as the permanent magnets 36 are formed on the inner peripheral side of the permanent magnets 36.

The rotor core 32 has a structure in which a permanent magnet insertion hole 34, a hole for passing the shaft 38, and an air hole 39 are punched out. A hole through which the permanent magnet insertion hole 34 and the shaft 38 are inserted, and an air hole 39 are punched out, and silicon steel plates are laminated, and the permanent magnet 36 and the shaft 38 are inserted into the holes through which the permanent magnet insertion hole 34 and the shaft 38 are inserted to rotate. The child 30 is configured. At that time, the air holes 39 formed in the rotary iron cores 32 of the respective layers communicate with each other. Therefore, air holes through which air can flow are formed between the permanent magnet 32 and the shaft 38.

The permanent magnet rotor 30 rotates in the arrow (counterclockwise) direction and operates as an electric motor. The permanent magnet 36 used has a rectangular parallelepiped shape.

Since the rotor 30 can be made lighter by providing the same number of air holes 39 as the number of permanent magnets in the yoke portion on the inner peripheral side of the permanent magnet, the entire rotating electric machine can be made lighter and high-speed rotation can be achieved. It will be suitable.

Further, when a rare earth magnet is used as the permanent magnet 36, the decrease in magnetic flux due to temperature rise is large. Therefore, by providing the same number of air holes 39 as the number of permanent magnets so that cooling air can be introduced into the inner circumference of the rotor 30, the magnet temperature can be lowered, the amount of magnetic flux can be increased, and the torque can be increased. it can.

In the high-speed internal rotation type permanent magnet rotating electric machine, since the permanent magnets 36 are arranged on the outer peripheral side, the magnetic flux density of the yoke portion 32A of the rotor core 32 on the inner peripheral side becomes extremely low. Therefore, there is room for providing the air holes 39.

Further, the weight reduction of the magnet rotor 32 by providing the air holes 39 can reduce the load on the bearings 42 and 44.

With the above configuration, it is possible to provide a small-sized, lightweight, highly efficient permanent magnet rotating electric machine suitable for high-speed rotation.

In the example shown in FIG. 4, the radius R0 of the rotor 30 is 57.5 mm, and the distance R1 from the center of the rotor 30 to the position on the inner peripheral side of the permanent magnet 36 is 49.5.
mm, and assuming the same size as the example shown in FIG. 3, the radial distance R5 on the inner peripheral side of the air hole 39 is 27 mm.
The distance R6 in the radial direction of the air hole 39 can be set to 17 mm, and the width of the air hole 39 on the outer peripheral side can be made the same as the width of the permanent magnet 36. At this time, the total weight of the rotor 30 can be reduced by 27%.

The number of air holes 39 is preferably the same as the number of permanent magnets 36, but may be less than the number of permanent magnets 36. At this time, it is preferable to set the number of holes to an integer fraction of the number of permanent magnets 36 in consideration of the rotation balance.

The total opening area of the air holes 39 is the rotor 30.
It is effective to make it 20% or more of the cross-sectional area.

According to the present embodiment, since the magnetic flux leakage can be reduced, it is possible to prevent the torque generated in the internal permanent magnet rotary electric machine from being reduced, and as a result, the rotary electric machine can be made smaller and lighter, so that the rotary electric machine can be rotated at a high speed. Becomes

Further, since the rotor can be made lighter by providing the air holes in the yoke portion on the inner peripheral side of the permanent magnet, the entire rotating electric machine can be made lighter and suitable for high speed rotation.

Further, by providing the air holes, cooling air can be introduced into the inner circumference of the rotor, whereby the magnet temperature can be lowered, the amount of magnetic flux can be increased, and the torque can be increased.

Further, since the magnet rotor can be made lighter by providing the air holes, the burden on the bearing can be reduced.

Next, a permanent magnet rotating electric machine according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a cross-sectional view of a rotor of a permanent magnet rotating electric machine according to a third embodiment of the present invention, and FIG. 6 is a diagram illustrating the distribution of magnetic flux density in the embodiment shown in FIG. The entire structure of the rotary electric machine according to the present embodiment is as shown in FIG. 1, and the structure of the stator is as shown in FIG.

In FIG. 5, the rotor 30 of the rotating electric machine is
A high-permeability magnetic material, for example, a rotor core 32 in which a plurality of silicon steel plates are laminated, and eight permanent magnets inserted into eight permanent magnet insertion holes 34 provided in the rotor core 32. It is composed of a magnet 36 and a shaft 38. 8
The individual permanent magnets 36 are arranged at equal intervals in the circumferential direction of the rotor core 32 so that their polarities are opposite to each other.

Further, the same number of air holes 39 as the permanent magnets 36 are formed on the inner peripheral side of the permanent magnets 36.

The rotor core 32 has a structure in which a permanent magnet insertion hole 34, a hole for passing the shaft 38, and an air hole 39 are punched out. A hole through which the permanent magnet insertion hole 34 and the shaft 38 are inserted, and an air hole 39 are punched out, and silicon steel plates are laminated, and the permanent magnet 36 and the shaft 38 are inserted into the holes through which the permanent magnet insertion hole 34 and the shaft 38 are inserted to rotate. The child 30 is configured. At that time, the air holes 39 formed in the rotary iron cores 32 of the respective layers communicate with each other. Therefore, air holes through which air can flow are formed between the permanent magnet 32 and the shaft 38.

Further, the length of the permanent magnet insertion hole 34 provided in the rotor iron core 32 is made larger than the length of the permanent magnet 36 to form the holes 52 and 54 of the bridge portion. The holes 52 and 54 of the bridge portion are filled with an adhesive or the like. Further, the gap on the outer circumference in the radial direction of the permanent magnet 36 can be made stronger by filling it with an adhesive or the like.

With the above structure, the amount of permanent magnets used can be reduced. Since rare earth magnets are expensive,
Reducing the amount of magnets is effective. Even if the magnet amount is reduced, the holes 52, 54 are provided at both ends in the circumferential direction of the permanent magnet 36.
Is present, the magnetic flux leaking to the auxiliary magnetic pole side is reduced, and there is no fear that the torque is reduced.

Further, in the structure having the holes 52 and 54 of the bridge portion on the inner peripheral side between the magnetic pole piece and the auxiliary magnetic pole, the gradient of the magnetic flux density on the air gap surface in the circumferential direction becomes gentle, and the pulsating torque,
Generation of cogging torque can be reduced. That is,
As shown by the solid line in FIG. 6, the magnetic flux density generated by the permanent magnet 36 is uniform in the portion facing the permanent magnet 36, and at both ends of the permanent magnet 36, due to the existence of the holes 52 and 54, the void surface is formed. The gradient of the magnetic flux density of is gentle in the circumferential direction. In addition, in FIG. 6, the broken line shows the magnetic flux density when the length of the permanent magnet insertion hole 34 and the length of the permanent magnet 36 are made equal, and in this case, the change in both ends of the magnetic flux density is rapid. Becomes

According to the present embodiment, since the magnetic flux leakage can be reduced, the torque generated in the internal permanent magnet rotary electric machine can be prevented from being reduced. As a result, the rotary electric machine can be reduced in size and weight, and the rotary electric machine can be rotated at a high speed. Becomes

Further, since the rotor can be made lighter by providing the air holes in the yoke portion on the inner peripheral side of the permanent magnet, the rotating electric machine as a whole can be made lighter and suitable for high speed rotation.

Further, by providing the air holes, cooling air can be introduced into the inner circumference of the rotor, whereby the magnet temperature can be lowered, the amount of magnetic flux can be increased, and the torque can be increased.

Further, since the magnet rotor can be made lighter by providing the air holes, the burden on the bearing can be reduced.

Further, the amount of permanent magnets can be reduced.

Further, the inclination of the magnetic flux density in the circumferential direction becomes gentle, and the generation of pulsating torque and cogging torque can be reduced.

Next, a permanent magnet rotating electric machine according to a fourth embodiment of the present invention will be described with reference to FIG. Figure 7
[FIG. 11] A sectional view of a rotor of a permanent magnet rotating electric machine according to a fourth embodiment of the present invention.

The entire structure of the rotary electric machine according to this embodiment is as shown in FIG. 1, and the structure of the stator is as shown in FIG.

In FIG. 6, the rotor 30 of the rotary electric machine is
A high-permeability magnetic material, for example, a rotor core 32 in which a plurality of silicon steel plates are laminated, and eight permanent magnet insertion holes 34 ′ provided in the rotor core 32 It is composed of a permanent magnet 36 and a shaft 38.
The eight permanent magnets 36 are arranged at equal intervals in the circumferential direction of the rotor core 32 so that their polarities are opposite to each other.

Further, as many air holes 39 as the permanent magnets 36 are formed on the inner peripheral side of the permanent magnets 36.

The rotor core 32 has a permanent magnet insertion hole 34 '.
The hole for passing the shaft 38 and the air hole 39 are punched out. The permanent magnet insertion hole 34 ′, the hole through which the shaft 38 passes, and the air hole 39 are punched out, and silicon steel plates are laminated, and the permanent magnet 36 and the shaft 38 are inserted into the holes through which the permanent magnet insertion hole 34 ′ and the shaft 38 pass. Rotor 3
0. At that time, the air holes 39 formed in the rotary iron cores 32 of the respective layers communicate with each other. Therefore, air holes through which air can flow are formed between the permanent magnet 32 and the shaft 38.

Here, at both ends of the permanent magnet insertion hole 34,
The slits 62 and 64 are formed. The slits 62 and 64 are configured to raise the rotor core 32 on the inner peripheral side of the holes 52 and 54 shown in FIG. 5 to the outer peripheral side.
With this configuration, the permanent magnet 36 can be positioned in the circumferential direction. Also, the amount of use can be reduced by filling an adhesive such as varnish into the void portion of the bridge portion.

Further, the permanent magnet 36 is inserted into the insertion hole 3 of the permanent magnet.
When it is inserted into 4 ', it is attracted to the magnetic material side adjacent thereto by the attraction force of the permanent magnet 36, so that it can be housed on the magnetically stable inner diameter side. This facilitates insertion of an adhesive such as varnish on the outer peripheral side of the permanent magnet. The varnish is the pole piece 32B1.
It is possible to provide a permanent magnet rotating electric machine suitable for high-speed rotation by alleviating mechanical contact between the permanent magnet 36 and the permanent magnet 36.

According to the present embodiment, since the magnetic flux leakage can be reduced, it is possible to prevent the torque generated in the internal permanent magnet rotary electric machine from being reduced, and as a result, the rotary electric machine can be made smaller and lighter, so that the rotary electric machine can rotate at a high speed. Becomes

Further, since the rotor can be made lighter by providing the air holes in the yoke portion on the inner peripheral side of the permanent magnet, the entire rotating electric machine can be made lighter and suitable for high speed rotation.

Further, by providing the air holes, cooling air can be introduced into the inner circumference of the rotor to lower the magnet temperature, increase the amount of magnetic flux, and increase the torque.

Further, since the magnet rotor can be made lighter by providing the air holes, the burden on the bearing can be reduced.

Furthermore, the positioning of the permanent magnet becomes easy.

Next, an electric vehicle using a permanent magnet rotating electric machine according to the fifth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a block configuration diagram of an electric vehicle equipped with a permanent magnet rotating electric machine according to a fifth embodiment of the present invention.

The electric vehicle body 100 has four wheels 1
It is supported by 10, 112, 114 and 116. Since this electric vehicle is driven by the front wheels, the permanent magnet rotating electric machine 120 is directly attached to the front axle 154. The drive torque of the permanent magnet rotating electric machine 120 is controlled by the control device 130. Control device 13
A battery 140 is provided as a power source of 0, and electric power is supplied from the battery 140 to the permanent magnet rotating electric machine 120 via the control device 130.
20 is driven and the wheels 110 and 114 rotate. The rotation of the handle 150 is transmitted to the two wheels 110 and 114 via a transmission mechanism including a steering gear 152, a tie rod, a knuckle arm, etc., and the angle of the wheels is changed.

In the above embodiments, the permanent magnet rotating electric machine has been described as being used to drive the wheels of an electric vehicle, but it can also be used to drive the wheels of an electric locomotive or the like.

According to the present embodiment, when the permanent magnet rotating electric machine is applied to an electric vehicle, particularly an electric vehicle, a small, lightweight and highly efficient permanent magnet rotating electric machine drive device can be mounted, and an electric vehicle having a long mileage per charge can be mounted. Can be provided.

[0079]

According to the present invention, the permanent magnet rotating electric machine can be rotated at high speed, and the one-charge traveling distance of an electric vehicle using the same can be lengthened.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a permanent magnet rotating electric machine according to an embodiment of the present invention viewed from the front side.

2 is a cross-sectional view of the permanent magnet rotating electric machine according to the embodiment of the present invention, showing the AA cross section of FIG. 1. FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a sectional view of a rotor of a permanent magnet rotating electric machine according to another embodiment of the present invention.

FIG. 5 is a sectional view of a rotor of a permanent magnet rotating electric machine according to a third embodiment of the present invention.

FIG. 6 is a diagram for explaining the distribution of magnetic flux density in the embodiment shown in FIG.

FIG. 7 is a sectional view of a rotor of a permanent magnet rotating electric machine according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram of an electric vehicle equipped with a permanent magnet rotating electric machine according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Permanent magnet rotary electric machine 20 ... Stator 22 ... Stator iron core 24 ... Stator winding 26 ... Housing 30 ... Rotor 32 ... Rotor iron core 32A ... Yoke 32B ... Outer peripheral part 32B2 ... Auxiliary magnetic pole piece 32B1 ... Magnetic pole piece Part 32B3 ... Bridge part 34 ... Permanent magnet insertion hole 36 ... Permanent magnet 38 ... Shaft 39 ... Air hole 46, 48 ... End bracket 42, 44 ... Bearing 52, 54 ... Bridge part hole 62, 64 ... Slit part 100 ... Vehicle body 110, 112, 114, 116 ... Wheels 130 ... Control device 140 ... Battery 150 ... Steering wheel 152 ... Steering gear 154 ... Axle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Kawamata 7-1, Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Suetaro Shibukawa 2520 Takaba, Hitachinaka City, Ibaraki Prefecture Incorporated company Hitachi, Ltd. Automotive Equipment Division (72) Inventor Osamu Koizumi 2520 Takaba, Hitachinaka City, Ibaraki Prefecture Incorporated Hitachi, Ltd. Automotive Equipment Division (72) Keiji Oda 2477 Takaba, Hitachinaka City, Ibaraki Prefecture Shares Within Hitachi Car Engineering

Claims (7)

[Claims] 1. A stator having a stator core around which a stator winding is wound, and rotatably held on the inner circumference of the stator,
In a permanent magnet rotating electric machine comprising a rotor core and a rotor having a plurality of permanent magnets arranged inside the rotor core so as to face the stator core, a radius R0 of the rotor, Ratio (R1 / R0) of distance R1 from the center of the rotor to the position on the inner circumference side of the permanent magnet
Is larger than 0.85, a permanent magnet rotating electric machine. 2. The permanent magnet rotating electric machine according to claim 1, wherein the thickness of the permanent magnet is not more than twice the thickness R2 of the bridge portion which is the narrowest portion of the rotary iron core on the outer peripheral side of the permanent magnet. A permanent magnet rotating electric machine characterized by the above. 3. The permanent magnet rotating electric machine according to claim 1, further comprising an air hole formed on the inner peripheral side of the permanent magnet and communicating with the rotating iron core. 4. The permanent magnet rotating electric machine according to claim 1, wherein holes are formed in a circumferential direction of the permanent magnet. 5. The permanent magnet rotating electric machine according to claim 1 or 4, wherein the permanent magnet is inserted into a permanent magnet insertion hole formed in the rotor core, and the insertion hole of the rotor core is inserted. And a resin is inserted into a space around the outer periphery of the permanent magnet. 6. The permanent magnet rotating electric machine according to claim 1, wherein a slit is formed in a circumferential direction of the permanent magnet. 7. A stator having a stator core around which a stator winding is wound, and rotatably held on the inner circumference of the stator,
A permanent magnet rotating electric machine comprising a rotor core and a rotor having a plurality of permanent magnets arranged inside the rotor core so as to face the stator core is provided. In the electric vehicle using the driven permanent magnet rotating electric machine, the permanent magnet rotating electric machine has a radius R0 of the rotor and a distance R1 from the center of the rotor to a position on the inner peripheral side of the permanent magnet. An electric vehicle using a permanent magnet rotating electric machine, characterized in that the ratio (R1 / R0) is made larger than 0.85.