Rotor with automatic flux weakening structure and permanent magnet motor

A magnetic structure and automatic technology, applied in the direction of magnetic circuit shape/style/structure, magnetic circuit, electrical components, etc., can solve the problems of weak magnetic speed expansion and other difficulties

Pending Publication Date: 2019-03-08
BEIDOU AEROSPACE AUTOMOBILE BEIJING CO LTD
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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 new rotor and permanent magnet motor with an automatic magnetic field weakening structure, through the magnet

Method used

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  • Rotor with automatic flux weakening structure and permanent magnet motor
  • Rotor with automatic flux weakening structure and permanent magnet motor
  • Rotor with automatic flux weakening structure and permanent magnet motor

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Embodiment Construction

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, ...

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Abstract

The invention relates to the technical field of a permanent magnet motor, and particularly relates to a rotor with an automatic flux weakening structure and a permanent magnet motor. The rotor comprises a plurality of permanent magnet installation rotary table units overlaid sequentially; each permanent magnet installation rotary table unit is provided with a plurality of permanent magnet insertion through holes and a magnetic conductive powder accommodation cavity; each two adjacent permanent magnet insertion through holes are communicated by a magnetic conductive powder compensation passage;each magnetic conductive powder compensation passage is communicated with the magnetic conductive powder accommodation cavity and a critical switching valve is arranged at the joint; when the rotor rotates at a high speed, the magnetic conductive powder compensation passages are communicated with the magnetic conductive powder accommodation cavity, a leakage magnetic flux is increased, and a magnetic flux passing through an air gap is reduced, so as to implement flux weakening; the rotating speed is reduced, a centrifugal force applying to magnetic conductive powder is gradually reduced, andwhen the magnetic conductive powder compensation passages move to the highest point, the magnetic conductive powder is returned to the magnetic conductive powder accommodation cavity and a value of the magnetic flux passing through the air gap is returned to a normal state; and the automatic flux weakening and speed expansion are implemented, the rotor and the permanent magnet motor are easy for motor control, and meanwhile, motor efficiency and a power density can be improved.

Description

technical field [0001] The invention relates to the technical field of permanent magnet motors, in particular to a rotor with an automatic field weakening structure and a permanent magnet motor. Background technique [0002] Permanent magnet synchronous motors are currently widely used due to their good working performance advantages. In particular, the built-in permanent magnets have reluctance torque due to the difference in inductance between the d-axis and the q-axis, which can effectively increase the power density of the motor. However, permanent magnet motors also have disadvantages, that is, magnetic field weakening is required at high speeds. At present, the main technical means is to increase the d-axis armature winding current to reduce the excitation flux, which will reduce the q-axis current component and reduce the torque at high speeds. Reduced, the current is not fully utilized, and at the same time, the motor loss increases and the efficiency decreases. Und...

Claims

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Application Information

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IPC IPC(8): H02K1/27
CPCH02K1/276
Inventor 刘贵生吕佳明刘志钢吴庆国吕学文
Owner BEIDOU AEROSPACE AUTOMOBILE BEIJING CO LTD
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