Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1997-11-26
1999-12-28
Ip, Paul
Electricity: motive power systems
Induction motor systems
Primary circuit control
318805, 318800, 318808, H02P 700, H02P 540
Patent
active
060086181
ABSTRACT:
An induction motor drive uses direct vector control for zero speed start up. According to the invention, a speed sensorless induction motor is controlled at all speeds, including zero or substantially zero speed, using direct vector control. In order to utilize direct vector control at all speeds, it is necessary to derive accurate stator flux vectors at all speeds. This is accomplished in the present invention by calculating two sets of stator flux vectors in diverse manners. A first set of flux vectors is derived from measured stator terminal voltage quantities, and a second set of flux vectors is derived from measured stator current quantities. The first set of flux vectors is valid at non-zero speed and the second set of flux vectors is valid at substantially zero speed. The direct vector control utilizes one of the two sets of flux vectors in accordance with predetermined criteria indicative of zero and non-zero speed conditions.
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B.K.Bose, M.G.Simoes, D.R.Crecelius, K. Rajashekara and R.Martin, "Speed Sensorless Hybrid Vector Controlled Induction Motor Drive", Conf. Rec. IEEE-IAS Annual Meeting, pp. 137-143.
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Bose Bimal Kumar
Patel Nitinkumar Ratilal
Rajashekara Kaushik
Dobrowitsky Margaret A.
General Motors Corporation
Ip Paul
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