Five-phase permanent magnet motor position-sensorless driving method and device capable of meeting variable working conditions of electric vehicle

Abstract

The invention discloses a five-phase permanent magnet motor position-sensorless driving method and device capable of meeting variable working conditions of an electric vehicle, and the implementation comprises the steps: providing a five-phase magnetic flux enhanced permanent magnet fault-tolerant motor which is more suitable for position-sensorless control and electric vehicle operation characteristics based on a compensation idea; a rotor position self-detection method is used for compensating the function of a position sensor, and position-sensorless operation in a full-speed domain is achieved; a disturbance self-adaptive controller with high robustness is designed, and it is ensured that high-quality torque can still be obtained when the motor breaks down; when the motor breaks down, redundant coordinate transformation and voltage compensation are not needed, non-reconstruction of the driving system under different faults is achieved, the complexity of the driving system under composite faults is reduced, and the reliability of the driving system under multiple operation conditions is improved. The technical constraints of fault tolerance and no position sensor of a traditional permanent magnet motor are broken through, the motor and the driving controller are comprehensively considered, and a new thought is provided for improving the performance of a vehicle motor driving system.

Description

technical field [0001] The invention belongs to the technical field of motor drive systems for vehicles, and in particular relates to a position sensorless drive method and device for a five-phase permanent magnet motor meeting variable working conditions. Background technique [0002] The development of electric vehicles has effectively alleviated the problems of environmental pollution and energy crisis in the world today. As a manned device, the safety and reliability of electric vehicles are particularly important. As the "heart" of electric vehicles, the motor drive system must not only meet the requirements of high power density, high efficiency, low torque ripple and wide speed regulation performance, but also have high reliability and the ability to deal with emergencies freely. Five-phase permanent magnet fault-tolerant motors have the advantages of high efficiency, high power density, wide speed range, low torque ripple and strong fault tolerance, and have attract...

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Problems solved by technology

However, this design theory does not consider the special application of electric vehicles with multiple operating conditions, so it is difficult to be directly applied to the field of electric vehicles

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