Brushless AC Drives
نویسنده
چکیده
The accuracy of rotor position estimation in the (several kHz), and its amplitude cannot be changed as it is conventional signal injection based sensorless control of determined by the DC-link voltage and the PWM duty cycle, permanent magnet brushless AC drives depends on the load the amplitude of high frequency current will be too small for current. This paper proposes an improved method, which the motor having a large stator inductance. Thus, the PWM significantly reduces the estimation error by accounting for the signal injection method may fail ifthe AD converter has a low cross-coupling effect between the dand q-axes. The accuracy and the high frequency current signal of the drive conventional and proposed methods are described and their has a low signal-to-noise ratio. Specially designed high speed performance is compared by both simulation and experiment. AD converter, trigger circuit and data buffers are required in
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