Fault-tolerant control method for five-phase fault-tolerant permanent magnet linear motor

Abstract

The invention discloses a fault-tolerant control method for a five-phase fault-tolerant permanent magnet linear motor. Fault-tolerant current is calculated according to the rule that the magnetomotive force amplitude values and phase angles of rotation before and after the motor is faulted are constant and the current amplitude values of the normal phases are equal; two pieces of orthogonal basis of a fundamental wave space are obtained, and a park transformation matrix is deduced and popularized, so that coordinate transformation of voltage and current is realized; instruction voltage and inverted potentials of all the phases are summarized to obtain expected phase voltages of all the phases under a natural coordinate system of the motor; the expected phase voltages are modulated by a voltage source inverter CPWM to realize interference-free fault-tolerant operation after the five-phase fault-tolerant permanent magnet linear motor is faulted. On the premise of ensuring that the output thrusts or torques of the motor are consistent before and after a certain phase of the motor is in open-circuit fault, the motor thrust or torque pulse can be effectively suppressed; further, more importantly, the dynamic performance of the faulted motor is consistent with that of the normal motor, so that high-dynamic-performance fault-tolerant operation of the motor is realized, and the algorithm has certain universality.

Description

technical field [0001] The invention relates to a motor open-circuit fault fault-tolerant control method, in particular to a five-phase fault-tolerant permanent magnet linear motor control method. It is suitable for occasions that have high requirements on the reliability of the motor, such as aerospace and electric vehicles. Background technique [0002] After the motor drive system fails, the motor will run asymmetrically, the output torque will fluctuate significantly, the noise will increase significantly, the overall performance of the system will deteriorate, and even fail to work, seriously endangering production safety. Therefore, the fault tolerance of the motor system is very important. [0003] Fault-tolerant motor refers to a new type of motor that realizes the independence of the circuit and magnetic circuit between phases and phases in space by changing the winding mode and stator tooth structure, thereby improving the motor's ability to operate with faults. T...

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Problems solved by technology

[0004] In view of the characteristics of five-phase fault-tolerant permanent magnet motors and the characteristics of open circuit faults of this type of motor system, and the problems existing in the prior art, the purpose of the present invention is to overcome the shortcomings of traditional current hysteresis loop inverter switching frequency disorder, serious noise and the existing problems. With voltage vector control, there are defects that the current cannot be accurately followed and the calculation is complicated. A high-performance fault-tolerant control method for five-phase fault-tolerant permanent magnet linear motors is proposed.

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