JPH09275647A - Stator of magnet motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost and weight of a magnet motor to be used in an electric car, etc., and improve the motor characteristics. SOLUTION: First of all, a plurality of stator core plates 31 as shown in the figure (A) are stacked to make a stator 30 as shown in the figure (B). In this stage, magnets are not yet inserted into magnet insertion holders 50, 51, 52, 53. Next flat magnets 40a, 40b, 41a, 41b, etc., are inserted into the magnet insertion holders 50, 51, 52, 53 to make the stator 30 into the one as shown in the figure (C).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is characterized by the structure of a stator of a magnet motor, and is particularly suitable for use in an electric bicycle, which is also called an assist type bicycle, in which a human driving force is assisted by a motor driving force. And a stator of a magnet motor.

[0002]

2. Description of the Related Art Recently, both a human-powered driving unit driven by human power and an electric driving unit driven by a motor are provided, and the motor is driven according to the magnitude of the human-powered driving force, and the human-powered driving force is supplemented by the motor driving force. Electric bicycles that are popular are gaining popularity.

Conventionally, such an electric bicycle has been disclosed in Japanese Patent Laid-Open No.
As shown in JP-A-358987 (B62M23 / 02), a driving system by human power and a driving system by electric motor are provided in parallel, and the driving force of the driving system by human power is detected to control the output of the electric motor. What you have done is known.

However, in such a structure, since the driving portion is located away from the rear wheels, there is a large loss of force before the driving force is transmitted to the rear wheels, and in order to transmit power to the rear wheels, pedals and The vertical rotation of the electric motor must be converted to the horizontal rotation of the drive shaft, and must also be converted to the vertical rotation to rotate the rear wheels, which complicates the configuration and increases the size. Had problems such as failure.

In order to solve this problem, the applicant has provided an electric bicycle of the type in which the rear wheels are directly rotated by an electric motor. Hereinafter, an example of a rear wheel direct drive type electric bicycle will be described with reference to the drawings.

FIG. 2 is an overall perspective view of a rear wheel direct drive type electric bicycle, in which 1 is an electric bicycle main body.
The electric bicycle main body 1 is provided with a motor 8 which will be described later, so that the driving force of the motor 8 is changed according to the magnitude of the torque due to the human power, and the power of the human power is assisted by the power of the motor 8 to travel. Has become.

A front wheel 2, a rear wheel 3, a handlebar 13 and a saddle 21 are attached to a frame 4 of the electric bicycle body 1, and the front wheel 2 is steered by the handlebar 13. A disk-shaped casing 5 is provided on the rotation shaft of the rear wheel 3.
Is provided.

The disk-shaped casing 5 comprises a rotating side casing 6 and a fixed side casing 7 fixed to the electric bicycle main body 1, and the rotating side casing 6 rotates together with the rear wheel 3. There is.

The disk-shaped casing 5 has a built-in motor 8 which is driven when electric drive is required to rotate the rotary side casing 6 together with a manual drive unit 10 which will be described later. The driving portion including the disc-shaped casing 5 is the electric driving unit 9.

The human power drive unit 10 is provided with a pedal 11 and a chain 12, and when the user steps on the pedal 11,
The rear wheel 3 is rotated via the chain 12. In this example, the chain 12 is a transmission member of human power. However, the invention is not limited thereto, and a chain, a rotating shaft, or the like may be used instead of the chain 12.

Brake levers 14 and 15 are attached to both left and right ends of a steering wheel 13 for steering the front wheel 2, and brake devices 18 and 19 are provided to the front wheel 2 and the rear wheel 3, respectively. And braking device 18, 19
Are connected by wires 16 and 17.

By pulling the brake levers 14 and 15, the wires 16 and 17 are pulled, and the wires 16 and 17 are pulled.
The front and rear brake devices 18 and 19 are respectively operated by 17. Further, a brake switch 20 is provided in the middle of the wires 16 and 17, and the mechanism is such that energization of the motor 8 is stopped when the brake levers 14 and 15 are operated.

A battery portion 22 serving as a power source of the motor 8 is attached to the frame 4 on the rear wheel 3. The battery section 22 includes a battery case 23 slidably attached to the frame 4 and a single-type rechargeable battery housed in the battery case 23. The power supply voltage is approximately 24 volts.

Next, the board casing 5 will be described with reference to FIGS. 3 and 4. FIG. 3 is a front view showing the configuration of the disc-shaped casing 5 shown in FIG. 2, and in the figure, 7 is a stationary casing fixed to the main body of the electric bicycle.

A control unit (not shown) including a control board and a heat sink, a motor 8, a first pulley for transmitting the output of the output shaft 24 of the motor 8, and a pulley set 25 of a second pulley are provided in the stationary casing 7. A reduction gear mechanism 26 including three pulley groups of a final stage pulley 28, a transmission belt 27 that connects between the respective pulleys of the reduction gear mechanism 26 and the final stage pulley 28 are arranged.

The final stage pulley 28 is fixed to the rotating side casing 6, and when the motor 8 rotates, the output belt 24 of the motor 8 to the final stage pulley 28 is rotated by the transmission belt 27 and is decelerated to the final stage. The rotating casing 6 rotates together with the pulley 28.

The second stage connected to the final stage pulley 28
A one-way clutch (not shown) is interposed in the smaller pulley so that the motor 8 is not turned when a force from the pedal is applied, that is, the pedal is light. 29 is a rear wheel axle.

FIG. 4 shows a motor 8 in the disk-shaped casing 5.
It is a front view which shows the arrangement state of a stator, 30 is a stator, 40
Is a magnet and 60 is an armature.

However, the size and weight of the electric drive unit 9 provided with the board-like casing 5 is considerable, and it has been desired to reduce its weight and size for use in a bicycle. In addition, downsizing of the drive motor was also an issue in order to reduce the weight and size.

[0020]

In order to downsize a motor having a permanent magnet as a field, a magnet having a large BH product is used.
It is effective to take a large magnetic flux. As magnets having a large BH product, rare earth magnets such as neodymium magnets made of neodymium, ferrite, iron and boron and samarium cobalt magnets have been known in recent years.

For example, the neodymium magnet has a BH product of 3 mega gauss, which is about 10 times that of a ferrite magnet, but the price is about 30 times per unit weight, which is expensive. Therefore, neodymium magnets are commonly used in the field of rotors of brushless motors in motors.

Therefore, it is an option to employ a brushless motor using a rare earth magnet such as a neodymium magnet in order to miniaturize the motor, but it is difficult in terms of complexity of the circuit structure and cost.

Therefore, it is more effective to employ a magnet motor which is a direct current motor having a mechanical brush while using a rare earth magnet for the stator to achieve miniaturization while having a mechanical brush. An object of the present invention is to reduce the size and weight of a magnet motor used in an electric bicycle or the like and to improve the motor characteristics.

[0024]

In the stator of the magnet motor of the present invention, a magnet insertion holder is provided on the stator, and the magnet insertion holder cuts the end portion of the magnet insertion hole at the extreme position from the center of the magnet. It is characterized by being formed. As a result, leakage magnetic flux between the magnet end and the stator can be prevented, so that the characteristics of the motor are improved.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on embodiments with reference to the drawings. FIG. 1 shows a block diagram of a stator of a magnet motor of the present invention. 1A is a front view of a stator of a magnet motor, FIG. 1B is a perspective view of the same, and FIG. 1C is a relationship diagram of a magnet insertion hole and a magnet of the stator.

In the figure, 31 is a stator core plate punched from an iron plate (silicon steel plate), 30 is a stator of a magnet motor formed by laminating stator core plates 31, 50,
Reference numerals 51, 52 and 53 denote magnet insertion holders formed on the stator 30.

In this magnet insertion holder, after the magnet insertion hole is once formed, the end portion of the magnet insertion hole is divided into two.
It is formed by cutting at both extreme positions from the center of the magnet.

Reference numerals 40a, 40b, 41a and 41b are flat plate magnets. The magnets are strong magnet type rare earth magnets such as neodymium magnets, and two magnets form one magnetic pole. Similarly, other two magnetic poles (not shown) form a four-pole stator in this example.

Therefore, in order to complete the stator 30 of the magnet motor, first, a plurality of stator core plates 31 shown in FIG. 1A are laminated to form the stator 30 as shown in FIG. 1B. At this stage, the magnet has not yet been inserted into the magnet insert holder 50, 51, 52, 53.

Next, the flat magnets 40a, 4 are attached to the magnet insertion holders 50, 51, 52, 53 of the stator 30.
The stator 30 is formed as shown in FIG. 1C by inserting and holding 0b, 41a, 41b and the like.

At this time, the magnet insertion holders 50, 5
Since 1, 52, 53 are formed by cutting at both extreme positions from the center of the two magnets, leakage magnetic flux between the magnet end and the stator core can be prevented.

[0032]

As described above, since the strong magnet is used as the magnet, the motor can be made smaller and lighter, and the magnetic path between the magnet end and the stator core is interrupted so that the leakage magnetic flux can be prevented and the motor characteristics can be improved. Can be made.

Further, the work of positioning the magnet when attaching to the stator and the work of adhering by using an adhesive agent are not required, the assembling property is improved, and the adhesive agent is not required. Can be configured with.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a stator of a magnet motor of the present invention.

FIG. 2 is an overall perspective view of an electric bicycle.

FIG. 3 is a front view and a side view showing a configuration of a board-shaped casing.

FIG. 4 is a layout view of motors on a board casing.

[Explanation of symbols]

 1 Electric Bicycle Main Body 2 Front Wheel 3 3 Rear Wheel 4 Frame 5 Panel Casing 6 Rotating Side Casing 7 Fixed Side Casing 8 Motor 9 Electric Drive 10 Human Power Drive 11 Pedal 12 Chain 13 Handle 14, 15 Brake Lever 16, 17 Wire 18 , 19 Brake device 20 Brake switch 21 Saddle 22 Battery part 23 Battery case 24 Motor output shaft 25 Pulley assembly 26 Reduction mechanism 27 Transmission belt 28 Final stage pulley 29 Rear wheel axle 30 Stator 31 Stator core plate 40-43 Magnets 50-53 Magnet Insert holder 60 Armature (rotor)

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[Procedure amendment]

[Submission date] December 26, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

[0020]

In order to downsize a motor having a permanent magnet as a field, a magnet having a large BH product is used.
It is effective to take a large magnetic flux. As magnets having a large BH product, rare earth magnets such as neodymium magnets made of neodymium, iron and boron and samarium cobalt magnets have been known in recent years.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

For example, a neodymium magnet has a BH product of 30.
With MGOe, which is about 10 times that of a ferrite magnet,
The price is about 30 times more expensive per unit weight, which is expensive. So neodymium magnets are commonly used in the field of rotors of brushless motors in motors.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

Therefore, it is an option to employ a brushless motor using a rare earth magnet such as a neodymium magnet in order to miniaturize the motor, but it is difficult in terms of complexity of the circuit structure and cost.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

Reference numerals 40a, 40b, 41a and 41b are flat magnets, and the magnets are strong magnet type rare earth magnets such as neodymium magnets, and two magnets form one magnetic pole. Similarly, other two magnetic poles (not shown) form a four-pole stator in this example.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiro Suhara 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Toshihiro Matsumoto 2-chome, Keihanhon-dori, Moriguchi-shi, Osaka No. 5-5 Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A magnet motor having a stator provided with a magnet insertion holder, wherein the magnet insertion holder is formed by cutting the ends of the magnet insertion holes at both extreme positions from the center of the two magnets. Characteristic magnet motor stator.