Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1995-06-07
1997-07-22
Sircus, Brian
Electricity: motive power systems
Switched reluctance motor commutation control
318439, 318751, 318772, H02P 736
Patent
active
056506970
ABSTRACT:
The improved motor drive unit includes a zero-crossing voltage detector circuit composed of components (7) to (12) for detecting whether the voltage from an AC power supply (1) is zero-crossing and a switching circuit for performing on-off control by means of a thyristor 27 so as to switch between energization and de-energization of the AC power supply to a motor (2) and controls the speed of the motor by changing the ratio between the times of energization and de-energization of the AC power supply to the motor. The start of energization coincides with the zero-crossing of the AC power supply voltage whereas the timing of end of energization coincides with the zero-crossing of an energization current by means of the thyristor and wherein the energization time is fixed at a value either equal to or twice the power supply period whereas the de-energization time is varied in units that are integral multiples of one half the power supply period. If desired, a plurality of patterns for percent energization may be combined to attain a desired percent energization. Alternatively, a plurality of patterns that are equal in the ratio between the energization and de-energization times are used in combination. Only the main winding in the motor is preferably controlled for optimal energization.
Akiyama Takuo
Hasegawa Yu
Hayashida Tatsunao
Imagi Akihiko
Ishida Haruhiko
Mitsubishi Denki & Kabushiki Kaisha
Sircus Brian
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