| 摘要 |
PURPOSE:To prevent undesired rotation of a motor by turning OFF its driving rotation by driving circuit OFF means when a brake command signal is input at the time of starting. CONSTITUTION:A motor control circuit 10 has a driving circuit 12, sequentially turns ON a plurality of transistors(Tr) 12U1-12W4 to apply a driving voltage, thereby controlling a the rotating direction and speed of a motor 14. The rotating direction and speed are detected by magnetic sensors 16-20, and input as feedback signals to a matrix circuit 28 through amplifiers 22-26. After the signal is shaped by waveform shapers 30-34, it is then input to a stop detector 36. Further, the direction is detected by a D type flip-flop 38, and input to a forward/reverse controller 40. An RS flip-flop 58 receives a brake command signal B at its set terminal S, and sets its output terminal Q to '1' only at the time of starting. Thus, if the signal B exists at the time of starting, the Tr 54 is turned ON, the Tr 46 is turned OFF, and the circuit 12 is stopped. |
