A control method for a double-winding permanent magnet fault-tolerant motor drive system

Abstract

The invention discloses a control method for a drive system of a duplex-winding permanent magnet fault tolerant motor. The duplex-winding permanent magnet fault tolerant motor consists of a slot stator 12 and a polar meter pasting type permanent magnet rotor, wherein the stator comprises two sets of symmetrical armature windings in three-phase centralized tooth-separating winding, which are independent with one another. The control method comprises the following steps: establishing a mathematical model of the drive system of the duplex-winding permanent magnet fault tolerant motor, realizing control on the motor through a speed controller, a current controller, a SVPWM and an inverter in sequence according to the established model as well as the acquired and given motor signal; increasing a fault diagnosing and redundancy communicating function to respectively diagnose and process the winding broken circuit or short circular faults of the control system. The control method is simple and easy to implement, has high reliability and strong fault tolerance, can be used for realizing the fault-tolerant control on the system broken circuit of the short circuit fault very well, and is suitable for aerospace and military situations with high reliability and high performance requirements.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a control method for a double-winding permanent magnet fault-tolerant motor drive system. Background technique [0002] With the increasing development of multi-electric / all-electric aircraft, the research and development of a new generation of multi-electric and all-electric aircraft has become a hot topic in the aviation field. A typical feature of multi-electric and all-electric aircraft is to use electric actuators to replace part or all of the hydraulic and pneumatic transmission mechanisms of traditional aircraft, which greatly saves the operating cost of the aircraft, is light in weight, small in size, low in fuel consumption, and Improve the aircraft's reliability, maintainability and ground support capabilities. The more electric aircraft is the transition to realize the all-electric aircraft. The current existing more electric aircraft mainly include: the A380 of...

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Problems solved by technology

Since 1996, Professor B.C. Mecrow of the University of Newscastle in the United Kingdom proposed a non-backup permanent magnet fault-tolerant motor and its control system, and successively completed six-phase eight-pole and four-phase six-pole permanent magnet fault-tolerant motor systems for aviation. The fault-tolerant control The method mainly uses the relationship table between flux linkage, current and rotor position to carry out fault identification and fault-tolerant control by looking up the table. The control is simple and easy to realize digitalization. The relationship between the position and position is also different, and the relationship table needs to be re-measured. Therefore, the workload of the preliminary preparation is relatively large, and the portability of the control algorithm is not strong.

In addition, Professor D. Howe of Shefield University proposed a modular permanent magnet brushless fault-tolerant motor, and proposed an optimal torque control strategy based on current hysteresis, but the analytical formula of this method is relatively complicated and requires many times iterative calculations, making the control algorithm too complex

In addition, the current permanent magnet fault-tolerant motor drive system and its control method still have obvious deficiencies: since each phase winding of the system is driven by an H bridge, compared with the redundant motor drive, the number of main power tubes is doubled, reducing the system The reliability and power density are not conducive to structural optimization, and the current control methods are too complicated, and the reliability and fault tolerance of the system need to be further improved.

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