Full-speed range position sensorless improvement control method of large-power hub motor

Abstract

The invention discloses a full-speed range position sensorless improvement control method of a large-power hub motor, and belongs to the field of a motor control method. The full-speed range positionsensorless improvement control method comprises the following steps of S1, building an MTPA and weak flux control-based hub motor vector control system; S2, building a position sensorless identification system of an MRAS combined with position sensorless; S3, designing a variable-weight weighing switching method; S4, building a given torque-based position sensorless permanent-magnet synchronous motor vector control system; S5, building a simulation model of the position sensorless permanent-magnet synchronous motor vector control system, and performing simulation verification; S6, improving and designing the switching method; S7, testing convergence of two switching algorithms during abrupt running, and performing algorithm simulation; and S8, verifying the identification performance of the improved algorithm within a full-speed range. By switching of two position identification algorithms, the working zone of the two algorithms is reduced on the basis of ensuring identification accuracy, and software and hardware resources are saved.

Description

technical field [0001] The invention relates to the field of motor control methods, in particular to an improved control method without a position sensor in the full speed range of a high-power wheel hub motor. Background technique [0002] In the full speed range, in order to make full use of the advantages of the pulse vibration injection method and the MRAS method, it is necessary to design a reasonable switching method, so that the two algorithms can achieve effective switching and ensure smooth transition of the motor during the switching process. Otherwise, it is easy to cause the algorithm The inaccurate position acquisition during the switching process leads to the inability to control the motor normally, which in turn affects the normal driving of the vehicle. The following problems exist when switching between different identification algorithms. The switching involves the conversion of rotational speed and position angle, and both algorithms need to be run at the s...

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Problems solved by technology

[0002] In the full speed range, in order to make full use of the advantages of the pulse vibration injection method and the MRAS method, it is necessary to design a reasonable switching method so that the two algorithms can achieve effective switching and ensure that the motor achieves a smooth transition during the switching process. Otherwise, it is easy to cause the algorithm The inaccurate position acquisition during the switching process leads to the failure to control the motor normally, which in turn affects the normal driving of the vehicle. The following problems exist when switching between different identification algorithms. The switching involves the conversion of the speed and position angle, and the two algorithms need to be run simultaneously in the full speed range. To ensure the stability of the system when switching, this leads to excessive occupation of the software and hardware resources of the control system

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