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Five-phase permanent magnet motor open-circuit fault-tolerant current setting method considering back electromotive force third harmonic

A permanent magnet motor, open-circuit fault technology, applied in the direction of motor, motor control, AC motor control, etc., can solve the problems of poor output torque characteristics, inoperability, and poor fault tolerance of the motor, and achieve the effect of small torque fluctuation

Pending Publication Date: 2022-05-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fault tolerance of traditional three-phase permanent magnet synchronous motors is poor, especially when a winding open circuit or short circuit fault occurs, the output torque characteristics of the motor will deteriorate, and it may even fail to work, which is difficult to meet the requirements of pure electric vehicles, aerospace and other motor systems. Stringent requirements for performance and fault tolerance

Method used

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  • Five-phase permanent magnet motor open-circuit fault-tolerant current setting method considering back electromotive force third harmonic
  • Five-phase permanent magnet motor open-circuit fault-tolerant current setting method considering back electromotive force third harmonic
  • Five-phase permanent magnet motor open-circuit fault-tolerant current setting method considering back electromotive force third harmonic

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0079] Specific embodiment one: the following combination Figures 1 through 3 Description of the present embodiment.

[0080] Taking the open circuit of the A-phase winding as an example, it is explained that when the five-phase permanent magnet motor opens the circuit of any one-phase winding, the fault tolerance current calculation method of the remaining phase normal winding is:

[0081] When an open circuit fault occurs in the A-phase winding, adjust the setting value of the input current of the remaining B, C, D, E four-phase windings, and the corresponding expression is:

[0082]

[0083] where, i B1 、i C1 、i D1 、i E1 Adjusted B, C, D, E phase winding currents, I m1 To adjust the amplitude of the B, C, D, E phase winding current, ω is the current angle frequency, θ 1 、θ 2 、θ 3 、θ 4 The phases of the adjusted B, C, D and E phase winding currents, respectively;

[0084] When considering the third harmonic in the rotor magnetic field, the expression of the no-load back potenti...

Embodiment

[0096] Example: The following is a specific embodiment of a five-phase permanent magnet motor in the case of a one-phase winding open circuit fault.

[0097] Taking a 15-slot 12-pole five-phase permanent magnet motor as an example, respectively, the five-phase permanent magnet motor in a normal state, a one-phase winding open circuit state, the output torque characteristics after the method to which the present invention belongs, as shown in Table 1, and then to illustrate the advantages of the method of the present invention.

[0098] Table 1 Comparison of torque characteristics in normal state and A phase open circuit fault state

[0099]

[0100] It can be seen that the five-phase permanent magnet motor open circuit fault fault setting method described in the present invention is used to consider the back potential third harmonic, the torque fluctuation of the five-phase permanent magnet motor under the open circuit fault of the one-phase winding can be significantly reduced,...

specific Embodiment approach 2

[0101] Taking the open circuit of the A and B two-phase windings as an example, it is explained that when the five-phase permanent magnet motor opens the circuit of the adjacent two-phase windings, the fault tolerance current calculation method of the remaining phase normal windings is:

[0102] When an open circuit fault occurs in the A and B phase windings, adjust the set value of the input current of the remaining C, D, and E three-phase windings, and the corresponding expression is:

[0103]

[0104] where, i C1 、i D1 、i E1 They are the adjusted C, D, and E phase winding currents, I m1 To adjust the amplitude of the C, D, E phase winding current, ω is the current angle frequency, θ 2 、θ 3 、θ 4 The phases of the adjusted C, D, and E phase winding currents are adjusted, respectively;

[0105]When considering the third harmonics in the rotor magnetic field, the expression of the no-loaded back potential of the C, D, E three-phase windings is:

[0106]

[0107] where e C 、e D ...

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Abstract

The invention discloses a five-phase permanent magnet motor open-circuit fault-tolerant current setting method considering back electromotive force third harmonics, belongs to the field of multi-phase permanent magnet motors, and aims at improving the torque performance of a five-phase permanent magnet motor with back electromotive force containing third harmonics under an open-circuit fault and enabling the motor to have the capacity of stable operation under the open-circuit fault. According to the method, when the open-circuit fault occurs, only the phase of the non-open-circuit phase current is adjusted, and 2-time and 4-time torque ripple components related to counter potential fundamental waves and third harmonic waves in the torque after the fault are suppressed, so that the low-torque ripple characteristic is maintained, and stable fault-tolerant operation is further realized. The open-circuit fault is divided into three types of one-phase winding open-circuit fault, adjacent two-phase winding open-circuit fault and opposite two-phase winding open-circuit fault, and the limitation condition is that zero-sequence current is not restrained. And the torque fluctuation of fault-tolerant operation when the five-phase motor has a one-phase winding open-circuit fault, an adjacent two-phase winding open-circuit fault and an opposite two-phase winding open-circuit fault is effectively reduced.

Description

Technical field [0001] The present invention belongs to the field of multiphase permanent magnet motors, involving fault-tolerant control technology under open circuit fault. Background [0002] Permanent magnet synchronous motors are widely used in modern carriers, aerospace, high-end industrial equipment and other fields because of their significant advantages in efficiency and power density. At present, the most widely used is the three-phase permanent magnet synchronous motor, and its related supporting technology has been very mature. However, the fault tolerance of the traditional three-phase permanent magnet synchronous motor is poor, especially when the winding open circuit or short circuit failure occurs, the output torque characteristics of the motor become poor, and even cannot work, which is difficult to meet the strict requirements of pure electric vehicles, aerospace and other motor system reliability and fault tolerance. The phase redundancy characteristics of mult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/00H02P25/22H02P25/022H02P29/028H02P29/40H02P23/04
CPCH02P23/0004H02P25/22H02P25/022H02P29/028H02P29/40H02P23/04H02P2207/05Y02T10/64
Inventor 隋义尹佐生黄家萱周子愚郑萍
Owner HARBIN INST OF TECH