Rotor position detecting method for permanent magnetic brushless direct current motor (DC motor)

Abstract

The invention discloses a rotor position detecting method for a permanent magnetic brushless direct current motor (DC motor), which detects the rotor position of the permanent magnetic brushless DC motor by a state observer and a Kalman filter, wherein, the state observer respectively observes the speed and torque fluctuation of the motor, and establishes a motor mathematical model with convenient linearization for observation when observing; and the Kalman filter adopts a linearization method surrounding the latest state estimation value, i.e. expanding Taylor series near the predicted estimation value and taking a linear term thereof to obtain an approximate expression. The rotor position detecting method for the permanent magnetic brushless DC motor of the invention has good reliability, high efficiency, high accuracy and flexible control, and can realize control of the motor without a position sensor.

Description

technical field

[0001] The invention relates to a detection method, in particular to a rotor position detection method for a permanent magnet brushless DC motor. technical background

[0002] Modern industry has higher and higher requirements for motor performance, and the improvement of motor performance is achieved through the following two ways. One is the research on the motor body, which mainly uses a special structure to improve the performance of the motor; the other way is Adopt advanced control strategies. Traditionally, the research on brushless DC motors mainly focuses on the motor itself and the hardware circuit of the controller, but there is little research on various advanced automatic control strategies.

[0003] The reason why the permanent magnet brushless DC motor can run synchronously and has the good speed regulation performance of the brushed DC motor is that the on and off of the inverter power device (corresponding to the conduction state of the moto...