A sensor to measure the stator torsional vibration due to torque ripple produced by a surface mount permanent magnet machine is first described. The sensor is relatively inexpensive and is straight forward to incorporate into a drive system. Experiments are performed to validate that the voltage produced by the sensor is linearly related to torque ripple amplitude. Closed-loop controllers are then described that adjust the stator current harmonics applied to the machine to achieve a commanded average torque while mitigating measured torsional vibration. Simulation and experimental results are used to demonstrate the effectiveness of the control techniques.
In this letter, a method of determining the initial position of the rotor of a permanent magnet synchronous machine is derived based upon signatures in torque-ripple-induced vibration. Although requiring a vibration sensor, the method requires no knowledge of machine parameters, is applicable to both surface-and buried-magnet machines, and can be used under no load. Hardware validation has been performed using a surface-magnet machine, wherein a maximum error of 2.1 (electrical) has been achieved using a start-up routine that requires 50 ms to complete.Index Terms-Initial position measurement, permanent magnet synchronous machines (PMSM), piezoelectric materials, torque measurement.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.