Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1999-07-29
2000-12-05
Ip, Paul
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318245, 318439, H02P 706
Patent
active
061571512
ABSTRACT:
A full wave signal E is compared with a trapezoidal wave signal G in a comparator to output a second comparison signal H. The full wave signal E is obtained through full wave conversion applied to a sine wave signal of a Hall element. The trapezoidal wave signal G is obtained by sampling and holding an attenuated signal F, obtained by attenuating the full wave signal E, at a trailing end of a first comparison signal D, and nulling the attenuated signal F at a subsequent leading end thereof. Then, the first and second comparison signals D, H are added up in an OR circuit to output an addition signal K, so that no drive current IL flows through the driving coils at a point near the former and latter halves of a phase changeover point. Near the former half of a phase changeover a point, the drive current IL is nulled before counter electromotive force Ec becomes small, enabling motor noise reduction. Near the latter half of a phase changeover point, the drive current IL remains zero, continuously from the former half, preventing a drop of efficiency in driving a motor. Since a trapezoidal wave signal G is made from the attenuated signal F, a period with the drive current IL being zero is always ensured near the former half of a phase changeover point.
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Someya Takashi
Yoshitomi Tetsuya
Ip Paul
Sanyo Electric Co,. Ltd.
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