Detector of operation of motor for clock

Abstract

Abstract PURPOSE:To detect the operating conditions with a simple construction by a method wherein a reference voltage at a certain level and the voltage at which a motor is operated to detect the operating conditions of the motor from the differece in voltages. CONSTITUTION:The oscillation output of a quartz oscillator 2 is converted into a certain pulse current by a clock IC 1. The output pulse of the clock UC 1 is supplied to the base of a switching transistor Q1 in a motor driving coil 3a via a capacitor C1. In a comparator 4, the voltage VB is a reference voltage. Althrough the part A of the voltage VB may become greater than the voltage VE as shown in Fig. (a) when operating rotor 3c, the level of the voltage VE rises, reducing the degree of steepness, when the rotor 3 shown in Fig. (b) is being stopped at c, thus eliminating the part A. Hence, the operating condiction can be detected by checking whether or not there is the part A. In other words, a transistor Q2 in the comparator 4 is turned on and off according to the size relation between VB and VE, so that the rotational state is detected according to the operation of an operating circuit 5 that has received a judging signal VS.

Inventors

• 👤 Hidetoshi Kasai

Bibliographic Details