Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-07-12
2009-10-13
Duda, Rina I (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S400020
Reexamination Certificate
active
07602139
ABSTRACT:
An apparatus and method for estimating rotor angle information for the control of permanent magnet AC motors having sinusoidal current excitation. The disclosed motor drive can provide full load operation at very low speeds including zero speed without the use of a shaft position sensing device. The rotor angle is estimated through injection of high frequency current, and rotor angle is extracted by a signal-conditioning algorithm, which utilizes current amplitude differential to discriminate the rotor angle. Rotor angle magnetic axis orientation (North or South pole) at startup is detected by comparing time average current ripple (at signal injection frequency) content between two different levels of d-axis current injection.
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Duda Rina I
Farjami & Farjami LLP
Glass Erick
International Rectifier Corporation
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