| 摘要 |
A motor speed controller, for example for accurate linear control of DC motors, includes an error amplifier, such as an integrating error amplifier, for providing a variable controlled voltage to a motor in response to an input to the amplifier, the input comprising a combination of a demand signal representative of a desired speed of the motor and a feedback signal representative of an actual speed of the motor. An electronic switch, such as a transconductance amplifier, has a first input responsive to an electrical signal representative of the actual speed of the motor and a second input responsive to the polarity of the output of the amplifier so as to provide the feedback signal, the value of the feedback signal being dependent on the value of the signal representative of the actual speed of the motor and the polarity of the signal being dependent on the polarity of the output of the amplifier.
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