Sensorless controller for robust prediction of permanent magnet synchronous wheel hub motor

Abstract

The invention discloses a sensorless controller for robust prediction of a permanent magnet synchronous wheel hub motor. According to the sensorless controller, a sliding mode observation module, a 3s / 2r coordinate transformation module and a disturbance observation module are connected in series; the sliding mode observation module is connected with a reference flux linkage calculation module inseries; the disturbance observation module and the reference flux linkage calculation module are connected with a wheel hub motor dead-beat model prediction control module in parallel; the wheel hub motor dead-beat model prediction control module is connected with a reference voltage compensation module, an inverter nonlinear compensation module, a 2r / 2s coordinate transformation module and a wheel hub motor control system in series; the wheel hub motor dead-beat model prediction control module avoids the defect that the calculated amount of model prediction control is too large; the referencevoltage compensation module compensates disturbance caused by parameter mismatch into reference voltage; the inverter nonlinear compensation module avoids large errors, caused by mismatching of reference voltage and actual voltage due to inverter nonlinearity, to position and speed estimation of a rotor; and the sliding mode observation module realizes sensorless observation of the position angleand the speed of the rotor.

Description

technical field [0001] The invention belongs to the technical field of motor drive control, in particular to a surface-mounted permanent magnet synchronous hub motor controller for an electric vehicle. Background technique [0002] Electric vehicles are showing a rapid development trend due to their obvious advantages such as no pollution, diversified energy utilization, and high efficiency. Permanent magnet synchronous motors are widely used in various types of electric vehicles due to their high efficiency, high power density, and high reliability. The surface-mounted permanent magnet synchronous hub motor is different from the traditional inner rotor motor to drive the entire electric vehicle through the transmission system. It can completely omit a series of mechanical parts such as clutches and transmissions on the traditional internal combustion engine, and integrate the drive, transmission and braking devices. Integrating into the wheel hub simplifies the chassis stru...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the existing permanent magnet synchronous wheel hub motors that the motor parameters are mismatched or the accuracy of the sensors is reduced or even invalidated due to temperature, humidity or other external factors, thereby affecting the performance of the motor. In addition, considering the reverse The nonlinear problem of the transformer brings large errors to the estimation of the position and speed of the rotor. A robust predictive sensorless controller for permanent magnet synchronous in-wheel motors that can effectively improve the control accuracy of the system is proposed.

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