DRIVER FOR DC BRUSHLESS MOTOR

PURPOSE: To enhance efficiency of a DC brushless motor when the motor is driven with a conduction pattern of 6 step electric angle of 120 deg. or less and the voltage is controlled for the conduction waveform through pulse width modulation. CONSTITUTION: A position detection circuit 4 outputs a posi...

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Hauptverfasser:	YAJIMA SADAO, KAWASAKI ISAO, YOSHIKAWA YOSHIHIKO, SUZUKI HIROAKI, MOCHIZUKI SHOJI, MORI MASATO, ISHIGAMI TAKAHIRO, IWASAKI YOSHIHIRO, TANIFUJI HITOSHI, TANIGAWA MAKOTO, ITOI YUICHI
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PURPOSE: To enhance efficiency of a DC brushless motor when the motor is driven with a conduction pattern of 6 step electric angle of 120 deg. or less and the voltage is controlled for the conduction waveform through pulse width modulation. CONSTITUTION: A position detection circuit 4 outputs a position detection signal from an induced voltage wave of a motor 3. A waveform generating section 20 turns a switching element 2A ON to perform PWM control during 30 deg. and then turns the switching element ON continuously during 60 deg. thereafter performs PWM control again during 30 deg.. At that time, a carrier generating section 17 and an ON-duty setting section 18 generates a PWM pattern. When the PWM is set at the forward and rear parts of 120 deg. conduction, the current waveform rises smoothly.