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A Phase Loss Fault Tolerant Control Method for Nine-phase Flux Switching Permanent Magnet Motor

A permanent magnet motor and flux switching technology, which is applied in the direction of electronically commutated motor control, motor generator control, control system, etc., can solve the problem of not analyzing the harmonic components of multi-phase harmonic subspace and unable to calculate the instantaneous fault-tolerant current online issues of value, lack of generality, and practicality

Active Publication Date: 2016-08-17
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the obtained solution is often not unique, and the optimization method can be used to find out the optimal result of a certain performance index, but this method needs to solve complex equations offline, and the instantaneous value of the fault-tolerant current cannot be calculated online. Lack of versatility and practicality
In addition, since there is no analysis of the multi-phase harmonic subspace harmonic components after phase loss, the algorithm can only use the method of hysteresis comparison in current control

Method used

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  • A Phase Loss Fault Tolerant Control Method for Nine-phase Flux Switching Permanent Magnet Motor
  • A Phase Loss Fault Tolerant Control Method for Nine-phase Flux Switching Permanent Magnet Motor
  • A Phase Loss Fault Tolerant Control Method for Nine-phase Flux Switching Permanent Magnet Motor

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Embodiment Construction

[0032] The present invention will be further explained below in conjunction with the accompanying drawings.

[0033] Such as figure 1As shown, a phase loss fault-tolerant control method of a nine-phase magnetic flux switching permanent magnet motor, through a photoelectric encoder 5, a vector control module 6 including a speed outer loop and eight current inner loops, and a space vector pulse width modulation module 7 and the nine-phase voltage type inverter 3 control the nine-phase magnetic flux switching permanent magnet motor 4, including the following specific steps:

[0034] Step 1), measure and calculate the rotor position θ of the motor through the photoelectric encoder r and the actual rotor speed ω r :

[0035] Step 2), the given speed value of the motor and the actual speed ω r After comparison, the quadrature-axis current component of the fundamental wave of the given electromagnetic torque is obtained through the PI regulator of the outer ring of the speed ...

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Abstract

The invention discloses a default phase fault-tolerant control method of a nine-phase flux-switching permanent magnetic motor. The default phase fault-tolerant control method includes that redundancy characteristics and harmonic current of a nine-phase system are utilized to compensate a fault-tolerant control strategy; when a motor winding or a driving system is in a default-phase failure caused by one-phase circuit breaking or circuit shorting, by online calculating third, fifth and seventh harmonic current momentary values under copper loss minimum boundary conditions in real time and performing closed-loop decoupling control on the harmonic current, the motor can be smoothly transited from a nine-phase normal state to an eight-phase fault state and maintain both output rotating speed and rotating torque to be unchanged, undisturbed running of the driving system is realized, and requirements, of high-reliability application fields like track traffic and electromobiles, on system continuous running capability are met; during designing of the nine-phase flux-switching permanent motor, electromagnetic torque pulsation rate is lowered while high torque density of the special motor is retained.

Description

technical field [0001] The invention relates to a phase-deficiency fault-tolerant control method of a nine-phase magnetic flux switching permanent magnet motor, which belongs to the motor drive technology. Background technique [0002] In recent years, multiphase technology has been successfully applied in the field of high-power motor drive systems. Compared with the speed control system based on three-phase motors, the multi-phase system reduces the torque ripple and reduces the requirements for the capacity of switching devices. In addition, polyphase systems are highly fault-tolerant. Due to its own redundancy characteristics, after one or several phases fail, the motor can still run smoothly under the fault state through proper fault-tolerant control without adding additional hardware costs. [0003] At present, many scholars at home and abroad are devoted to the research of fault-tolerant technology of motor system. In terms of the motor itself, the most widely stud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/18
Inventor 程明於锋花为邹国棠
Owner SOUTHEAST UNIV
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