Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1999-07-13
2000-10-10
Ip, Paul
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
318138, 318254, 318439, H02P 318
Patent
active
061309893
ABSTRACT:
In a motor, drive transistors (7, 9) are turned off by drive signals I, J output from a control circuit (10) at a point adjacent to a phase changeover point of the energizing to drive coils (1, 2), so that no drive current flows through the drive coils (1, 2). Since the counter electromotive forces of the drive coils (1, 2) become small, the drive current can be eliminated before the drive current sharply rises. As a result, sharp dropping of the drive current can be prevented. This allows variation in rotational torque of a motor to be suppressed, and thus reduces vibrational noise in the motor.
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Mizumoto Masao
Someya Takashi
Yoshitomi Tetsuya
Duda Rina I.
Ip Paul
Sanyo Electric Co,. Ltd.
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