Apparatus for controlling the speed and direction of a dc motor

Details Apparatus for controlling the speed and direction of a dc motor Apparatus for controlling the speed and direction of a dc motor

G - Physics

11

B

318/96

G11B 19/28 (2006.01)

Patent

CA 1123048

SO1144 S79P4 APPARATUS FOR CONTROLLING THE SPEED AND DIRECTION OF ROTATION OF A DC MOTOR ABSTRACT OF THE INVENTION A single pickup head generates an alternating signal proportional to the rotational speed of a DC motor which can be rotated in either of two directions, and such alternating signal is employed by speed and/or phase control circuits to control the motor speed relative to a reference speed in a selected one of the two directions. An overspeed sensing circuit detects speed runaway, which can occur when the motor is rapidly rotated in the direction opposite to the selected direction, and the overspeed sensing circuit then interrupts the motor drive voltage until the motor speed decreases to below its normal speed. At and below normal speed in the undesired direction, the normal torque acts in the selected direction to rapidly reverse the rotational direction and to accelerate the motor to normal speed in the selected direction.

320588

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