关键词: 磁链观测, 低通滤波器, 直流偏置, 无位置传感器控制

Abstract:

For the problem that the back EMF integration algorithm is influence by integral initial values, offset and drift components in the acquired feedback current, the nonlinear behavior of the switching converter, lead to integral saturation, cause the motor control system unstable, put forward a kind of flux observation algorithm which combine low-pass filter with zero drift correction. The low-pass filter was analyzed to inhibit but not eliminate the zero drift and zero drift correction after integral had its feedback. Two algorithms combine could completely eliminate the DC offset and easy to realizing. Simulation and experiments demonstrate that new algorithm can solve the problem, improve accuracy of rotor position and speed estimation, realize wide speed range sensorless control.

Key words: flux estimation, low-pass filter (LPF), DC offset, sensorless control