Vertical lifting system of double-winding permanent magnet fault tolerance motor and control method of vertical lifting system

Abstract

The invention discloses a vertical lifting system of a double-winding permanent magnet fault tolerance motor and a control method of the vertical lifting system. A stator of the double-winding permanent magnet fault tolerance motor of the system comprises two sets of three-phase windings which are independent and symmetrically distributed, and an armature winding centralized type tooth isolation winding manner is adopted in the three-phase windings. According to the control method, mathematical models are established for the lifting work condition and the cable descending work condition of the system, and control over the two work conditions of the motor is achieved through a speed controller, a current controller, a voltage controller, a brake unit, an SVPWM and an inverter according to the established models and the collected and given motor signals; meanwhile, the open-circuit fault diagnosis and redundancy communication functions are added, and whether the winding open-circuit fault exists in the system or not can be diagnosed and processed. The system and method are easy to implement and high in reliability, power density and fault tolerance. The both-way control over the system lifting work condition and cable descending work condition can be well achieved, and the fault tolerance control over the open-circuit fault of the system can be achieved.

Description

technical field [0001] The invention relates to the field of motor control technology, in particular to a vertical lifting system for a double-winding permanent magnet fault-tolerant motor and a control method thereof. Background technique [0002] With the increasing development of more electric aircraft and helicopters, the development of a new generation of aviation motor drive systems has become a hot topic in the aviation field. Among them, the helicopter winch usually uses hydraulic pressure or electricity as the driving force to lift or lower the load by winding steel cables or cables. Performance. [0003] Due to the shortcomings of hydraulic oil leakage, inconvenient disassembly and assembly, and difficulty in speed regulation, traditional hydraulic helicopter winches are gradually replaced by electric helicopter winches. Etc. However, the core of the electric helicopter winch is the motor drive system. Due to changes in device characteristics, insulation aging, ...

AI Technical Summary

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

However, there is still an obvious deficiency in the current permanent magnet fault-tolerant motor system and its control method: because 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's Reliability and power density are not conducive to structural optimization, and the control algorithm is too complex, which needs to be further improved in terms of system reliability and fault tolerance

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