Five-phase magnetic flow switching motor fault-tolerant control method based on minimum copper loss principle

Abstract

The invention discloses a five-phase magnetic flow switching motor fault-tolerant control method based on a minimum copper loss principle. According to specific circumstances of no-load counter potential of a motor, a current control mode consistent with the wave shape of the counter potential is adopted in the process of normal operation. When a system has a default-phase fault, electromagnetic torque is kept unchanged, a non-fault-phase fault-tolerant current formula under the condition of the minimum copper loss is worked out, the worked-out harmonic current is used for carrying out one-phase and two-phase fault-tolerant control on the motor, average output torque before an open-circuit fault of the motor and average output torque after the open-circuit fault of the motor are kept equal, the output torque in the fault and the output torque in the normal operation state are equivalent, and torque ripples and copper loss of windings are reduced. Compared with a traditional fault-tolerant control method, the five-phase magnetic flow switching motor fault-tolerant control method based on the minimum copper loss principle lowers the copper loss by 4.3% in the process of one-phase open-circuit fault tolerance, and lowers the copper loss by 12.9% in the process of fault tolerance of two adjacent phases.

Description

technical field [0001] The invention relates to the field of five-phase permanent magnet motors, in particular to a fault-tolerant control method for five-phase permanent magnet fault-tolerant motors, which is suitable for aerospace, electric vehicles and other occasions requiring high continuity and reliability of motors. Background technique [0002] With the continuous expansion of the application of motor drive systems in military, industrial and other fields, stable and reliable motor drive systems are particularly important for occasions with high reliability requirements such as aircraft and electric vehicles. Therefore, to meet the system requirements through fault-tolerant control becomes the key to ensure the reliability of the drive system. Fault-tolerant flux switching permanent magnet motor is a new type of stator permanent magnet motor. Its permanent magnets and windings are placed on the stator of the motor. There are neither windings nor permanent magnets on ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of fault-tolerant control of the existing five-phase permanent magnet motor in the absence of phase operation, overcome the defects of the existing open-circuit fault-tolerant technology, ensure that the output torque is equal before and after the fault, minimize copper consumption, and avoid A fault-tolerant control method for five-phase flux switching motors based on the principle of minimum copper loss is proposed based on the saturation of the magnetic circuit caused by excessive values ​​and the realization of high reliability of the drive system

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