Permanent magnet DC brushless motor for pure electric vehicle

A technology of permanent magnet DC and brushless motors, which is applied in the direction of electric vehicles, motors, electric components, etc., can solve problems such as low speed, achieve the effects of reducing moment of inertia, preventing slipping, and saving costs

Inactive Publication Date: 2016-02-24
济宁环宇机电有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a permanent magnet brushless DC motor for pure electric vehicles, which overcomes the technical difficulties of existing DC excitation motors and permanent magnet DC brushed motors for pure electric vehicles, and has higher anti-demagnetization ability and overload capacity , at low speed, the motor can have low-speed and high-torque characteristics, and at high speed, it can reduce the back electromotive force of the motor, increase the maximum speed of the motor, and meet the needs of pure electric vehicles under different working conditions

Method used

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  • Permanent magnet DC brushless motor for pure electric vehicle
  • Permanent magnet DC brushless motor for pure electric vehicle
  • Permanent magnet DC brushless motor for pure electric vehicle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1As shown, the permanent magnet brushless DC motor for pure electric vehicles of the present invention includes an upper end cover 8, a motor housing 2 and a lower end cover 7 connected as one, and the inside of the motor housing 2 is provided with a stator 1 and a The rotor 5 that is arranged on the motor shaft 4 and the two ends of the motor shaft 4 are provided with bearings 6. The motor shaft 4 is the rotation center of the rotor 5 when it rotates about the stator 1. The bearing 6 is located on the upper end cover 8 and the lower end cover 7. The motor shaft 4 is supported, and the stator 1 includes a stator core 11 with stator slots 111 evenly distributed inside and a winding coil 112 embedded in the stator slot 111. The two ends of the stator core 11 are provided with an insulating frame 3, and the insulating frame 3 is provided with a circuit The plate assembly 9 and the rotor 5 include a rotor core 51 and an even number of permanent magnets 52 uni...

Embodiment 2

[0039] Such as figure 2 As shown, on the basis of Embodiment 1, the rotor 5 adopts a radial structure. The rotor 5 includes a rotor core 51 and an even number of permanent magnets 52 evenly distributed around it. The permanent magnets 52 are radially magnetized, and the rotor core 51 Dovetail teeth 53 are arranged on the outer circumference of the rotor core 51, and 2p evenly distributed dovetail teeth 53 are arranged on the outer circumference of the rotor iron core 51, where p is the number of pole pairs of the motor, and the permanent magnet 52 is located in the open slot between the two dovetail teeth 53 , that is, each permanent magnet 52 has the same dovetail teeth 53 on both sides, which can fix the permanent magnet 52 in the circumferential and radial directions, which is more reliable and firm than the surface-mounted rotor structure bonded by glue, and is suitable for higher The use environment of the rotating speed, the middle part of the rotor iron core 51 is prov...

Embodiment 3

[0041] Such as image 3 As shown, on the basis of Embodiment 1, the rotor 5 adopts a radial structure, and the structure of the rotor 5 is consistent with the description in Embodiment 2. The shape of the permanent magnet 52 is a double-sided protruding shuttle. In the permanent magnet 52 Under the premise of the same length, the thickness of the permanent magnet 52 is increased, which further enhances the anti-demagnetization ability and overload capacity of the permanent magnet 52. At the same time, under the same reverse magnetic field, the permanent magnet 52 can provide higher air gap magnetic dense Br, thereby improving the working point of the permanent magnet 52 of the motor, increasing the overload capacity, and enhancing the anti-demagnetization ability.

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Abstract

The invention discloses a permanent magnet DC brushless motor for a pure electric vehicle, belonging to the technical field of permanent magnet DC current motor. The permanent magnet DC brushless motor for a pure electric vehicle comprises a stator, a rotor and a motor shaft; the stator comprises stator iron cores which are uniformly and internally distributed on the inner side of the stator; the two ends of the stator iron core are provided with insulation skeletons; the insulation skeleton is provided with a circuit board assembly; the rotor comprises a rotor iron core and a plurality of permanent magnets, the number of which is even; when a radial type rotor is adopted, the shapes of the permanent magnets are characterized in that: the permanent magnet is of a strip shape with the inner side and the outer side being arc, the permanent magnet is of a shuttle shape with double faces being projected and two sides being flushed and the permanent magnet is of a strip shape with an arc-shaped outer edge and single-face projected. The permanent magnet DC brushless motor for the pure electric vehicle can improve the working point of the permanent magnet, and enhances the demagnetization resistance capability and overloading capability of the motor. When the tangential type rotor is adopted, the internal of the rotor iron core which is close to the motor shaft is provided with a sector-shaped groove; and a conductive magnetic sliding block is arranged inside the sector-shaped groove. The adoption of the conductive magnetic sliding block can reduce the counter electromotive force of the motor, improves the highest rotation speed of the motor, and satisfies the low load of the pure electric vehicle and the special needs for high speed.

Description

technical field [0001] The invention relates to a motor, in particular to a permanent magnet DC brushless motor for pure electric vehicles, belonging to the technical field of permanent magnet DC motors. Background technique [0002] At present, the motors used in the pure electric vehicle industry mainly include DC excited motors and permanent magnet DC brushed motors. Because DC excited motors form a rotor magnetic field through excitation coils and use carbon brushes for commutation, the motors are large in size and low in efficiency. The problems of complex structure and low service life make it difficult to meet the high efficiency and high reliability requirements of the current pure electric vehicle industry. Although the permanent magnet DC brush motor solves the copper loss of the rotor excitation coil and improves the efficiency of the motor, it uses carbon The brushes are commutated and easily damaged, and there are still defects in the Chinese road conditions whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K29/08H02K1/27H02K11/30
CPCH02K1/276H02K29/08H02K2201/18H02K2211/03Y02T10/64
Inventor 张庆涵
Owner 济宁环宇机电有限责任公司
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