Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1998-06-19
2000-08-22
Ip, Paul
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318254, 318439, H02P 146
Patent
active
061077720
ABSTRACT:
A method for controlling a motor and a circuit for implementing the method are provided. The method includes the steps of providing current to a first phase coil of a motor and measuring the time for the current to rise between two predetermined levels. Because current rise time is proportional to phase inductance, and therefore, rotor position, the measured current rise time can be compared to a desired current rise time to determine whether conduction intervals in the motor phases are in-phase with the position of the rotor or are lagging or leading the position of the rotor. The method finally includes the step of supplying current to one of the first phase coil and a second phase coil responsive to the measured rise time in order to bring subsequent conduction intervals into phase with the position of the rotor.
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Blackburn Scott E.
Kalpathi Ramani R.
Liu Ning
Reuter David C.
Dana Corporation
Ip Paul
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