Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1996-07-05
1998-01-13
Ip, Paul
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318659, 318660, 318661, H02K 2400
Patent
active
057083444
ABSTRACT:
A pulse excitation circuit applies a constant voltage to windings, each of which is wound around a respective one of four magnetic poles of a resolver stator. In each of the respective windings, a voltage is generated corresponding to the rotation of the resolver rotor. From the generated voltage, it is possible to detect two flows of electrical currents which have different phases from each other. Values of the electrical currents after a lapse of time 2*Lav/r from the start of pulse excitation (Lay is an average inductance of the windings, while r is a DC resistance of a winding, including an electrical current detection resistance) are converted into two digital values. A micro computer calculates a rotation angle signal .theta. on the basis of the two digital values.
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Hayashi Yasukazu
Kamabuchi Hisashi
Shibata Shinji
Ip Paul
Okuma Corporation
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