Motor drive control device which uses pulse width modulation to control the speed of a motor
AssigneeNikon Corporation
InventorsMakoto Matsuzaki, Seiichi Yasukawa
Life of this patent
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Abstract
A motor drive control device which drives a motor in accordance with a pulse width modulated input signal, a first binary signal indicating a rotation direction for driving the motor and a second binary signal indicating whether drive of the motor is ON or OFF. The motor drive control device includes a logic circuit receiving the pulse width modulated input signal, the first binary signal and the second binary signal and, in response, producing a first pulse width modulated output signal and a second pulse width modulated output signal which together indicate a rotation direction and rotation speed for driving the motor.
Claims10
A motor drive control device which drives a motor in accordance with a pulse width modulated input signal that switches between first and second levels, a first binary signal indicating a rotation direction for driving the motor and a second binary signal indicating whether drive of the motor is ON or OFF, the motor drive control device comprising:
- a logic circuit receiving the pulse width modulated input signal, the first binary signal and the second binary signal and, in response, producing first and second output signals which together indicate a rotation direction for driving the motor and whether the motor is to be in a non-braking driving state or a braking state, at least one of the first and second output signals being a pulse width modulated signal,
- wherein, to control a rotation speed of the motor, the pulse width modulated input signal switches between the first and second levels to thereby cause the first and second output signals to switch between indicating the non-braking driving state and the braking state, respectively.
Dependencies are inferred from the claim text.