Motor drive circuit, motor system, and motor drive method

Details Motor drive circuit, motor system, and motor drive method Motor drive circuit, motor system, and motor drive method

2005-06-09

2008-03-11

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S132000, C318S434000

Reexamination Certificate

active

07342367

ABSTRACT:
A circuit suitable for formation as a small sized IC, able to decrease the number of externally attached parts and reduce the size, and stably rotating a motor. When rotating a rotor101by three-phase drive signals U, V, and W generated based on a CLK signal from a VCO7, induction voltages induced in the three-phase coils102are monitored and a phase deviation of a rotor phase relative to an electric phase is detected. As a result, when the rotor phase is late relative to the electric phase, a charge pump circuit5is driven by an up signal f_up which becomes active for exactly a time in accordance with the phase delay amount, while when the rotor phase is advanced, the charge pump circuit5is driven by a down signal f_down which becomes active for exactly a time corresponding to a phase advance amount. In this motor drive circuit1, the voltage of a VCO control terminal T_cp is directly and instantaneously and dynamically changed not in accordance with detected phase deviation information without going through a smoothing filter.

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