Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1996-07-19
1998-12-08
Cabeca, John W.
Electricity: motive power systems
Switched reluctance motor commutation control
318439, 323246, 323320, H02P 700
Patent
active
058475214
ABSTRACT:
A motor drive method and apparatus for reducing noise of a motor. The motor drive apparatus includes first, second and third half bridge circuits. Each of the first, second and third half bridge circuits includes a first transistor which is adapted to form a current path between a first operational potential and an output terminal thereof and a second transistor which is adapted to form a current path between a second operational potential and the output terminal thereof. Each of the output terminals are connected to the corresponding drive coil of a motor. Each of the first and second transistors includes a control terminal to which a control signal is supplied. The motor drive apparatus detects a counter-induced voltage of the drive coil corresponding to the second half bridge circuit by supplying control signals to the first and second transistors thereof for making each current path therein a non-conducting state, and for forming current paths in the first transistor of the first half bridge circuit and in the second transistor of the third half bridge circuit respectively. Further the motor drive apparatus cuts off the current path of the first transistor in the first half bridge circuit, forms it and cuts it off again by supplying a control signal thereto after start of supplying a control signal for forming the current path of the first transistor in the second half bridge circuit. A control signal for forming the current path is supplied to the control terminal of the second transistor in the third half bridge circuit.
REFERENCES:
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"Small Motor Control ICS", by H. Kato, Kogyo Chosakai, Kogyo Chousa-kai, Japan.
NEC Research & Development, "Power MOS IC for HDD Motor Drive", by M. Hattori et al., vol. 32, No. 3, Jul. 1991.
Kokami Yasuhiko
Morikawa Masatoshi
Seki Kunio
Cabeca John W.
Hitachi , Ltd.
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