Transducerless field orientation concepts employing saturation-induced saliencies in induction machines

• Published in: IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting Vol. 1; pp. 174 - 181 vol.1
• Main Authors: Jansen, P.L., Lorenz, R.D.
• Format: Conference Proceeding
• Language: English
• Published: United States IEEE 1995; Institute of Electrical and Electronics Engineers, Inc., Piscataway, NJ (United States)
• Subjects: CONTROL; Demodulation; ELECTRIC MOTORS; Frequency estimation; Inductance; Induction machines; INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; MAGNETIC FIELDS; Magnetic flux; Magnetic separation; ORIENTATION; Permanent magnet machines; SATURATION; Saturation magnetization; Stators; Tracking loops
• ISBN: 0780330080; 9780780330085
• ISSN: 0197-2618; 2576-702X
• DOI: 10.1109/IAS.1995.530299

This paper explores the tracking of high-frequency magnetic saliencies created by saturation as a means of continuously estimating the position and magnitude of flux for transducerless field oriented control at zero and low speed operation. Tracking is based upon inverter-generated high-frequency signal injection with demodulation incorporating heterodyning and a closed-loop tracking filter. Integration of the tracking scheme with the voltage model in a closed-loop flux observer topology is proposed as an attractive means of achieving very wide speed range transducerless field oriented control. The focus is toward induction machines, the applicability to surface-mounted permanent magnet synchronous machines is also briefly discussed. Experimental evaluation of saturation effects in two induction machines is included.