Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1996-03-05
1997-12-09
Masih, Karen
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388815, 318256, 318138, 318439, H02P 5165
Patent
active
056968710
ABSTRACT:
A DC motor control circuit which contains a DC motor as a part of bridge resistance constituting a bridge circuit includes a first terminal connected to one end of the DC motor in the bridge circuit. A switching transistor is connected to the first terminal. A second terminal is connected to the other end of the DC motor. A switching control circuit detects an unbalanced condition of the bridge circuit via the second terminal and controls the switching period of the switching transistor so as to restore the bridge circuit to a predetermined unbalanced condition or balanced condition. A part of the bridge circuit, the switching transistor and the switching control circuit are integrated into an IC, thereby the number of terminals for the IC is reduced and a coil and an externally added capacitor both for smoothing are unnecessary.
REFERENCES:
patent: 3576484 (1971-04-01), Gambill
patent: 3710219 (1973-01-01), Takahashi et al.
patent: 4008422 (1977-02-01), Sodekoda et al.
patent: 4506199 (1985-03-01), Asche
Horiuchi Sachito
Yama Michiaki
Masih Karen
Rohm & Co., Ltd.
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