Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Reexamination Certificate
2007-02-27
2007-02-27
Donovan, Lincoln (Department: 2837)
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
C388S811000, C388S814000, C388S828000, C388S829000, C388S832000, C318S254100, C318S434000, C318S811000, C318S599000
Reexamination Certificate
active
11290490
ABSTRACT:
In a control apparatus for a motor, which rotates a fan, a semiconductor device is connected to the motor in series to drive the motor. An analog driver circuit drives the semiconductor device with an analog voltage. A PWM control circuit drives the semiconductor device with a PWM signal of a frequency of less than several tens. A switching control circuit selects the analog driver circuit and the PWM control circuit when the motor is to be rotated at speeds lower and higher than a predetermined speed, respectively.
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Kanamori Atsushi
Yoshimura Satoshi
Colon Santana Eduardo
Denso Corporation
Donovan Lincoln
Posz Law Group , PLC
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