Patent ID: 8963455
Filing Date: 2015-02-24
Classification: G11B,H02P

Abstract:
1. A motor drive control device, comprising: a digital control unit; a digital/analog converter; a driver output unit; a drive current detection amplifier; an analog/digital converter; and a counter electromotive voltage detection unit, wherein, to an output terminal of the driver output unit, a series coupling between a motor and a detection resistor is allowed to be coupled, wherein the digital control unit generates and supplies a digital drive voltage command signal to an input terminal of the digital/analog converter, wherein the digital/analog converter responds to the digital drive voltage command signal generated from the digital control unit to generate an analog drive voltage command signal, wherein the driver output unit responds to the analog drive voltage command signal generated from the digital/analog converter to generate a drive output signal for driving the series coupling between the motor and the detection resistor, wherein the drive current detection amplifier responds to a drive current flowing in the detection resistor to generate a drive current analog amplified signal, wherein the analog/digital converter responds to the drive current analog amplified signal generated from the drive current detection amplifier to generate a digital drive current detection signal, wherein the counter electromotive voltage detection unit includes a first digital multiplier, a digital subtractor, a second digital multiplier, a first register, and a second register, wherein the first digital multiplier performs multiplication between the digital drive current detection signal generated from the analog/digital converter and first gain information stored in the first register to generate a first multiplication result, wherein the digital subtractor performs subtraction between the digital drive voltage command signal generated from the digital control unit and the first multiplication result generated from the first digital multiplier to generate a subtraction result N, wherein the second digital multiplier performs multiplication between the subtraction result generated from the digital subtractor and second gain information stored in the second register to generate digital counter electromotive voltage information as information on a second multiplication result, wherein the digital drive voltage command signal generated from the digital control unit is set to a predetermined value to allow a condition which maintains a speed of the motor and a counter electromotive voltage at substantially zero to be generated, and wherein, under the condition, the first gain information which sets a value of the digital counter electromotive voltage information generated from the second digital multiplier to substantially zero is allowed to be stored in the first register.