Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1998-06-19
2000-07-18
Nappi, Robert E.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, H02K 2300
Patent
active
060912162
ABSTRACT:
When a brushless motor is rotated at low speeds (the answer of a step S12 is YES), the brushless motor is driven by exciting a first phase coil, a second phase coil and a third phase coil by a sine wave PWM system having a phase difference of 120.degree. from each other to perform a torque control. Since the crest value of the sine wave is controlled in response to torque greatly fluctuated by a load, an out-of-phase phenomenon which is apt to occur at low rotational speeds can be previously prevented. When the brushless motor is rotated at high speeds (the answer of the step S12 is NO), the brushless motor is driven by a square wave PWM system based on a three-phase 120.degree. conduction type. Since the out-of-phase phenomenon is apt to occur as a frequency is increased when the brushless motor is driven by the sine wave PWM system, the control system is switched to a square wave PWM system to prevent the out-of-phase phenomenon. Therefore, the brushless motor can be driven smoothly without much pulsating torque over the full range of revolutions from a low speed (zero revolution) to high speeds (several tens of thousands of revolutions/min).
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Kenjo Takashi
Shoji Koichiro
Takahashi Hisashi
Yashiro Hirokazu
Ibiden Co. Ltd.
Leykin Rita
Nappi Robert E.
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