Five-phase permanent magnet motor fault-tolerant current calculation method considering second and fourth torque ripples under open circuit

A permanent magnet motor, current calculation technology, applied in the direction of motor, motor control, AC motor control, etc., can solve the problem of motor output torque characteristic deterioration, inoperability, poor fault tolerance, etc., to achieve the effect of small torque fluctuation

Pending Publication Date: 2022-06-07
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 fault-tolerant current calculation method considering second and fourth torque ripples under open circuit
  • Five-phase permanent magnet motor fault-tolerant current calculation method considering second and fourth torque ripples under open circuit
  • Five-phase permanent magnet motor fault-tolerant current calculation method considering second and fourth torque ripples under open circuit

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specific Embodiment approach

[0036] Specific implementation: the following combination Figure 1 to Figure 2 This embodiment will be described.

[0037] Taking the open circuit of the A-phase winding as an example, it is explained that when any one-phase winding of the five-phase permanent magnet motor is open-circuited, the calculation method of the fault-tolerant current of the normal windings of the remaining phases is as follows:

[0038] When the A-phase winding has an open-circuit fault, adjust the setting value of the input current of the remaining B, C, D, E four-phase windings, and the corresponding expression is:

[0039]

[0040] In the formula, i B1 , i C1 , i D1 , i E1 are the adjusted B, C, D, E phase winding currents, respectively, I m1 is the amplitude of the B, C, D, E phase winding current after adjustment, ω is the current angular frequency, θ 1 , θ 2 , θ 3 , θ 4 are the phases of the adjusted B, C, D, and E phase winding currents, respectively;

[0041] When considering th...

Embodiment

[0053] Embodiment: A specific embodiment of a five-phase permanent magnet motor in the case of an open-circuit fault of one-phase winding of a five-phase permanent magnet motor is given below.

[0054] Taking a five-phase permanent magnet motor with 10 slots and 8 poles as an example, the output torque characteristics of the five-phase permanent magnet motor in the normal state, the one-phase winding open-circuit state, and the method of the present invention are respectively given, as shown in Table 1. The advantages of the method of the present invention are further described.

[0055] Table 1 Comparison of torque characteristics under normal state and A-phase open-circuit fault state

[0056] working status normal status A-phase open circuit (uncontrolled) A-phase open circuit (fault-tolerant control) Output torque (N m) 38 30.4 28.5 Torque ripple (%) 0.4 21.4 6.1

[0057] It can be seen that the five-phase permanent magnet motor fault-t...

specific Embodiment approach 2

[0058] Specific embodiment two: the following combination image 3 This embodiment will be described. This embodiment will further describe Embodiment 1. The open circuit fault covers one or a combination of the open circuit of the winding and the open circuit of the switch tube of the inverter bridge arm where the winding is located.

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Abstract

The invention discloses a five-phase permanent magnet motor fault-tolerant current calculation method considering second and fourth torque ripples under an open circuit, belongs to the field of multi-phase permanent magnet motors, and aims to improve the torque performance of a five-phase permanent magnet motor with back electromotive force containing third and fifth harmonics under an open circuit fault and enable the motor to have the capability 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 second and fourth torque ripple components related to counter potential fundamental waves, third harmonic waves and fifth 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 a one-phase winding open-circuit fault and an inverter switching tube 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 and an inverter switching tube open-circuit fault is effectively reduced.

Description

technical field [0001] The invention belongs to the field of multi-phase permanent magnet motors, and relates to a fault-tolerant control technology under an open-circuit fault. Background technique [0002] Permanent magnet synchronous motors are widely used in modern vehicles, aerospace, high-end industrial equipment and other fields due to their significant advantages in efficiency and power density. At present, three-phase permanent magnet synchronous motors are widely used, and their related supporting technologies are very mature. However, the fault tolerance of traditional three-phase permanent magnet synchronous motors is poor, especially when open-circuit or short-circuit faults occur in the windings, the output torque characteristics of the motor become worse, or even fail to work, making it difficult to meet the reliability requirements of the motor system for pure electric vehicles, aerospace, etc. stringent requirements for reliability and fault tolerance. Com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/022H02P25/22H02P23/00H02P23/04H02P29/028H02P29/40
CPCH02P25/22H02P25/022H02P29/028H02P29/40H02P23/0004H02P23/04H02P2207/05Y02T10/64
Inventor 隋义尹佐生黄家萱高家林刘勇
Owner HARBIN INST OF TECH
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