Flux-weakening acceleration permanent magnet motor

A permanent magnet motor and permanent magnet rotor technology, which is applied to synchronous motors with stationary armatures and rotating magnets, synchronous machine parts, etc. resistance, improving the effect of weak field acceleration space and performance

Inactive Publication Date: 2019-05-14
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above operation mode requires field-weakening and speed-up permanent magnet motor. When the field-weakening operation is above the rated speed, a large part of the stator current will be used for field-weakening, which reduces the operating efficiency; generally the maximum speed will reach 3 times or even the rated speed. Higher, the back electromotive force generated by the permanent magnet flux at the highest speed will be much higher than the rated voltage, once the current of the weakening magnetic field deviates, the entire drive system will face a great risk of overvoltage

Method used

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  • Flux-weakening acceleration permanent magnet motor
  • Flux-weakening acceleration permanent magnet motor
  • Flux-weakening acceleration permanent magnet motor

Examples

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Embodiment 1

[0020] figure 1 Shown is a basic embodiment of the invention. The motor adopts the inner rotor radial surface-mounted permanent magnet pole type, and its stator part is a conventional AC motor stator, which is composed of stator winding 1, stator core 2 and permanent magnet rotor. A magnetic adjustment structure is set on the permanent magnetic rotor. The structure should be set between two adjacent permanent magnets 3 on the rotor yoke 4, that is, the place where the magnetic flux between the two poles is the largest, mainly composed of the magnetic adjustment cavity 5, the magnetic adjustment block limit 6, the elastic element 7, and the magnetic adjustment block 8 Composition; one end of the magnetic adjustment block 8 and the elastic element 7 is fixed, and the other end of the elastic element 7 is fixed, and the magnetic adjustment block 8 can move radially in the magnetic adjustment cavity 5; the magnetic adjustment block 8 should adopt a magnetically conductive The fer...

Embodiment 2

[0024] like Figure 4 As shown, the motor adopts the radial surface-mounted permanent magnet pole type of the outer rotor, and its magnetic adjustment structure is similar to the inner rotor structure of Embodiment 1, the difference is that the magnetic adjustment block 8 moves more and more to the outer circle. Being far away from the permanent magnet 3 will not increase the flux leakage of the permanent magnet 3 .

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Abstract

The invention discloses a flux-weakening acceleration permanent magnet motor. The flux-weakening acceleration permanent magnet motor is formed by a stator winding, a stator core and a permanent magnetrotor, magnetism adjusting structures are arranged between each two adjacent permanent magnets on a rotor magnetic yoke, each magnetism adjusting structure is formed by a magnetism adjusting chamberarranged in a radial manner and a magnetism adjusting block capable of moving along the radial direction, an elastic element connected with the magnetism adjusting block is also arranged in the magnetism adjusting chamber, one end of the elastic element is connected with the magnetism adjusting blocks, the other end of the elastic element is fixed, and an opening of the top of the magnetism adjusting chamber is provided with a magnetism adjusting block stopper. According to theflux-weakening acceleration permanent magnet motor, by employing a rotation centrifugal force principle, the magnetismadjusting block as a part of a permanent magnet magnetic circuit moves towards an excircle, the magnetism adjusting block and an original rotor yoke portion are staggered in the radial dimension so that the magnetic resistance of the rotor is increased, the permanent magnet magnetic flux of the motor is automatically reduced with the increase of the rotating speed, and the effect of mechanical flux weakening is achieved; besides, direct adjustment of the permanent magnet magnetic field can be realized, high efficiency and high power factor during a flux-weakening acceleration period are guaranteed, the overvoltage risk is reduced, and the flux-weakening speed-adjusting range can be further extended with the combination of electric flux weakening of the stator winding.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a traction permanent magnet motor which needs field weakening and speed up. Background technique [0002] At present, permanent magnet motors have been widely used in automobile electric drive systems, and are gradually being used as traction motors in the fields of electric locomotives and rail transit. [0003] These fields require the electric drive system to have the function of magnetic field weakening and speed expansion, that is, the rated speed and below require constant torque load characteristics (at this time, the permanent magnet flux of the motor remains unchanged, the stator current is all torque current, and the voltage at the motor terminal is proportional to the speed. Change, the terminal voltage reaches the maximum value and is equal to the rated voltage at the rated speed); above the rated speed requires constant power load characteristics (at this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/02H02K21/14
Inventor 张立春程方训王晨卉
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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