| Abstract |
This paper presents a novel strategy to guarantee continuous working of a Surface Permanent Magnet
Synchronous Motor (SPMSM) drive even when position-sensor failure occurs. This strategy consists
in using a sliding-mode speed observer, in place of a second sensor, without additional cost. The speed
observer needs an initial parameter tuning and has to be periodically tuned during sensor-based control
of the drive. In this way the speed estimate of the sliding-mode observer is accurate enough to avoid
switching from sensor-based control to sensorless one when position sensor is healthy and speed
transients occur. If the difference between estimated rotor speed and measured one exceeds an alarm
threshold, the failure and recovery manager switches the control scheme from sensor-based to
sensorless mode. Results of tests show effective field-oriented control is maintained when switching,
due to position-sensor failure, happens. |
