Apparatus for reversibly controlling a motor.

摘要

A reversible control apparatus for controlling a motor is provided which is highly durable, weather proof, simple in structure and inexpensive to manufacture. The motor (1) is controllably driven by a motor driver (3). A target rotational speed determiner (5) determines a target rotational speed for the motor and generates a corresponding output signal. A rotational speed sensor (2) senses the rotational speed of the motor and generates a corresponding output signal having no polarity which indicates the direction of rotation of the motor. A motor controller (4) controls the motor driver. A polarity applying means (6) applies a polarity to the output signal of the rotational speed sensor (2) on the basis of the output signal of the target rotational speed signal and the output signal of the motor controller (4). The polarity applying means (6) further determines whether there is agreement therebetween the direction of rotation of the target rotational speed signal and that of the output signal of the motor controller and generate, if there is disagreement therebetween, a motor driver control signal for making the output signal of the motor controller to zero until the direction of rotation of the target rotational speed signal coincides with that of the output signal of the motor controller. A subtracter (7) generates a deviation signal representative of a deviation between the target rotational speed signal and the polarity-applied rotational speed signal to the motor controller.