JPS56121382A - Positioning device - Google Patents

Abstract

PURPOSE:To obtain the positioning device by an electromotor excellent in a stop characteristic by a method wherein a commutation to the electromotor is interrupted by a signal of having finished to count a prescribed number of position detecting electrical pulses and at the same time, a reversing excitation coil commutated to apply damping to the electromotor. CONSTITUTION:In an electromotor control circuit A, feeding L-level inputs to terminals 31, 31a turns transistors 21, 24 ON, and during the operating time of a signal stabilizing circuit formed of a resistor 32, capacitor 33 and exclusive NOR gate circuit 34, a transistor 30 is turned ON and a high potential power source 19b is applied to the electromotor to cause it to rapidly be accelerated, and after the operating time thereof over, a transistor 29 is turned ON and the application of a low potential power source 19a maintains the rotation of the electromotor. When the terminals 31, 31a get to the H-level, transistors 23, 22 are turned ON and due to the operation of the single stabilizing circuit, the electromotor M is applied a counter-current braking by the application of the power source 19b and rapidly decelerated. In the following, in a control circuit B, when a set count value of a reversible counter circuit 60 is sabtracted by the position detecting pulses fed from a terminal 59b and made a zero count, the H-level is fed as an output to terminals 64, 64c connected with the terminals 31, 31a and made an inversion command.