Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1997-06-27
2000-01-04
Martin, David
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388822, 388910, 318677, 318632, G05F 110
Patent
active
060119020
ABSTRACT:
In an optical disc player, as signals are read from and written to an optical disc, the optical disc is rotated by a spindle motor and an optical pickup is moved by a sled motor. These motors are both direct-current motors. The motor control circuit of the invention uses a drive circuit based on the BTL method, and additionally uses a resistor that is connected in series with the direct-current motor between the output terminals of the drive circuit. The voltage drop across the resistor is fed back, as positive feedback, to the drive circuit through a feedback amplifier. Since, when the motor is started up, a high current flows through the motor and thus a large voltage drop occurs across the resistor, a high feedback voltage is obtained and thus a high drive voltage is applied to the motor.
REFERENCES:
patent: 4350943 (1982-08-01), Pritchard
patent: 4933614 (1990-06-01), Kawata
patent: 5020125 (1991-05-01), Losic et al.
patent: 5086492 (1992-02-01), Kent
patent: 5338977 (1994-08-01), Carobolante
Martin David
Rohm & Co., Ltd.
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