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Sensorless control of permanent magnet synchronous machines (PMSM) down to zero speed using high-frequency (HF) signal injection is an established method. Stable operation during transient states still presents a challenge for this method, especially for motors with very small anisotropies. This paper introduces a new method for stabilizing the sensorless control scheme. It is shown that a misalignment...
This paper analyzes different forms of carrier (high frequency) excitation for sensorless control of three-pole active magnetic bearings. Three options are compared: rotating injection, pulsating injection at a fixed angular position, and pulsating injection at an angular position synchronous to the minimum reluctance axis. Criteria for comparison include sensitivity to displacement changes, parameter...
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