Patent ID: 9548689
Date: 2017-01-17
CPC Classifications: H02P

Claim:
1. A control apparatus that controls a direct current (DC) motor, comprising: a sensor configured to detect a current value of the DC motor, and to transmit the current value to both a first current detection system and a second current detection system; the first current detection system configured to receive the current value of the DC motor and output, to an operation amplifier the second current detection system configured to receive the current value of the DC motor, to generate a third signal indicating the current value of the DC motor, to amplify the third signal, and to output, to the operation amplifier, the third signal amplified as a fourth signal; the operation amplifier configured to amplify a first difference between a speed signal indicating a moving speed of the DC motor and one of the first or second signals, and to amplify a second difference between the speed signal and the fourth signal, and to output, to a controller, the amplified first and second differences; and the controller that controls the DC motor based on the amplified first difference or the amplified second difference, wherein when the first signal is amplified in the first current detection system, the first current detection system amplifies the first signal by a gain smaller than that by which the second current detection system amplifies the third signal.