Torque characteristic improvement method under short-circuit fault of five-phase permanent magnet motor

A short-circuit fault and torque characteristic technology, which is applied in the direction of motor, motor control, AC motor control, etc., can solve problems affecting the operating characteristics of multi-phase permanent magnet motors, and achieve the effect of improving torque output characteristics and torque characteristics

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

Under normal circumstances, there are third, fifth and other high-order harmonics in the rotor magnetic field of multi-phase permanent magnet motors, and the rotor magnetic field harmonics will generate harmonic back EMF and harmonic short-circuit current in the winding back EMF and short-circuit current, thereby affecting Operation characteristics of multi-phase permanent magnet motor under short-circuit fault

Method used

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  • Torque characteristic improvement method under short-circuit fault of five-phase permanent magnet motor
  • Torque characteristic improvement method under short-circuit fault of five-phase permanent magnet motor
  • Torque characteristic improvement method under short-circuit fault of five-phase permanent magnet motor

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specific Embodiment approach 1

[0070] Specific embodiment one: the following combination Figure 1 to Figure 4 This embodiment will be described. The method for improving torque characteristics of a five-phase permanent magnet motor under short-circuit faults described in this embodiment is the same as the method for improving torque characteristics under short-circuit faults at the ends of windings of any phase A, B, C, D, and E. A Taking the short circuit at the end of the phase winding as an example, the fault-tolerant control method of the five-phase permanent magnet motor when the end of any phase winding is short-circuited is as follows:

[0071] When the end short-circuit fault occurs in the A-phase winding, the main component expression of the A-phase winding short-circuit current is:

[0072]

[0073] In the formula, i Ashort is the short-circuit current of the A-phase winding, I As1 and I As3 are the fundamental and third harmonic current amplitudes in the short-circuit current of the A-pha...

Embodiment

[0111] Embodiment: A specific embodiment of a five-phase permanent magnet motor in the case of a short-circuit fault at the end of a phase winding of a five-phase permanent magnet motor is given below.

[0112] Taking a five-phase permanent magnet motor with 15 slots and 12 poles as an example, the output torque characteristics of the five-phase permanent magnet motor in the normal state, the short-circuit state at the end of the one-phase winding, and the method of the present invention are respectively given, such as Table 1 shows the advantages of the method of the present invention.

[0113] Table 1 Comparison of torque characteristics under normal state and A-phase terminal short-circuit fault state

[0114] working status normal status A phase end short circuit (uncontrolled) A-phase terminal short circuit (fault-tolerant control) Output torque (N m) 62.8 44 31.9 Torque ripple (%) 0.5 62.6 21.4

[0115] It can be seen that using the m...

specific Embodiment approach 2

[0116] Specific embodiment two: the following combination image 3 and Figure 4 This embodiment is described. This embodiment further describes Embodiment 1. The short-circuit fault covers the end short circuit and partial turn short circuit of the winding, and one of the situations where the switch tube short circuit occurs in the bridge arm of the inverter where the winding is located. its combination.

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Abstract

The invention discloses a torque characteristic improvement method for a five-phase permanent magnet motor under a short-circuit fault, belongs to the field of multi-phase permanent magnet motors, and aims to improve the torque performance of the five-phase permanent magnet motor under the short-circuit fault and enable the motor to have the capability of stable operation under the short-circuit fault. According to the method, when the short-circuit fault occurs, the non-short-circuit phase current is adjusted, and 2-time and 4-time torque ripple components 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 short-circuit fault is divided into a one-phase winding end part short-circuit fault, a one-phase winding turn-to-turn short-circuit fault and an inverter switching tube short-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 end part short-circuit fault, a one-phase winding turn-to-turn short-circuit fault and an inverter switching tube short-circuit fault is effectively reduced.

Description

technical field [0001] The invention belongs to the field of multiphase permanent magnet motors, and relates to a fault-tolerant control technology under short-circuit faults. 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. Compa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/00H02P25/22H02P25/022H02P29/028
CPCH02P23/0004H02P25/22H02P25/022H02P29/028H02P29/027H02P2207/05Y02T10/64
Inventor 隋义苑子航杨士杰梁晓宇郑萍
Owner HARBIN INST OF TECH
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