Rotor core of a variable flux permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and rotor core, applied in the field of rotor core, can solve the problem of low motor output performance, achieve the effects of reducing output capacity, reducing magnetizing current, and reducing magnetic flux leakage

Inactive Publication Date: 2019-01-04
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, this type of motor uses permanent magnet materials with low coercive force, and the output performance of the motor is lower than that of ordinary permanent magnet motors, so measures need to be taken to increase the torque density of the motor

Method used

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  • Rotor core of a variable flux permanent magnet synchronous motor
  • Rotor core of a variable flux permanent magnet synchronous motor
  • Rotor core of a variable flux permanent magnet synchronous motor

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0020] Such as figure 1 As shown, it is a structural schematic diagram of the unimproved lamination one in the rotor core 1 that reduces the magnetizing current of the variable flux permanent magnet synchronous motor and improves the torque density according to the present invention. It can be seen that its main structure is : the rotor core silicon steel sheet 1, the magnetic steel is embedded...

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Abstract

The invention discloses a rotor core of a magnetic-flux variable permanent magnet synchronous motor. The rotor core is composed through overlaying of rotor core laminations, wherein the rotor core laminations comprise first-type laminations and second-type laminations; each first-type lamination has an annular structure, multiple magnetic steel embedding gaps which do not form fractures on outer edges are distributed and disposed in the circumferential direction and are used to form an installation groove of a magnetic steel body, and a first magnetic isolation hole which does not form a fracture on the outer edge of the first-type lamination is also disposed between every two magnetic steel embedding gaps; and the second-type laminations are similar with the first-type laminations and are different in that the second-type laminations form gaps in the outer edges. The rotor core disclosed by the invention is characterized in that magnetic steel brow leakage is reduced through breaking of a magnetic bridge between magnetic steel ends and the rotor outer diameter, so that magnetization currents are reduced, and a torque density is increased; and through breaking of a magnetic bridge between a quadrature-axis magnetic isolation groove and the rotor outer diameter, quadrature-axis inductance can be reduced and direct-axis inductance exceeds the quadrature-axis inductance, so that positive reluctance torque is obtained, and the torque density is increased.

Description

technical field [0001] The invention belongs to the field of motors, and more specifically relates to a rotor core of a variable flux permanent magnet synchronous motor. Background technique [0002] In recent years, drive motors for new energy vehicles mostly use built-in permanent magnet synchronous motors (IPMSM), which have the advantages of high power density, good mechanical characteristics, and high speed range, and have received extensive attention and attention in electric vehicle drive systems. application. However, the direct-axis inductance of the built-in permanent magnet synchronous motor is usually smaller than the quadrature-axis inductance. In order to use the reluctance torque and realize the field weakening control, the current trajectory is located in the second quadrant, and the current always contains a field weakening component, which increases the loss and the utilization of the magnet. The rate is lower. In addition, after the motor enters the high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27H02K1/02
CPCH02K1/02H02K1/27
Inventor 李健孙阿芳曲荣海
Owner HUAZHONG UNIV OF SCI & TECH
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