Controlling circuit for stopping of dc motor

Abstract

Abstract PURPOSE: To forcibly stop a DC motor in a purely electrical manner and make it maintain said stopping point, by making the motor generate a reverse damping torque when the motor stopping instruction is given, and controlling the motor so that the rotation thereof is stopped at a point of time when the motor voltage is zero. CONSTITUTION: When the motor stopping instruction is given, a signal SP becomes high in level, so that a switching circuit 9 is changed over to the state opposite to that shown in the figure. Moreover, the output signal FG of a frequency generator 5 is amplified in an amplifier 8 and fed to a drive circuit 6, as a signal DS, through the switching circuit 9. Because said signal DS is a sine-wave AC signal of average level OV, transistors 61 and 62 are turned on every positive and negative half-cycle periods of the signal DS respectively, and a voltage ES is applied to a motor 1. The stopping position of the motor 1 is one of the points P 1 , P 2 ..., in the zero cross points of the voltage ES, where the forward torque decreases as the voltage ES approaches the zero cross points during the positive voltage period while the reverse torque increases as the voltage ES becomes more distant from the zero cross points during the negative voltage. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Masaaki Sakai
• 👤 Mitsugi Yoshihiro

Bibliographic Details