| 摘要 |
PURPOSE:To detect revolution or no revolution of a step motor, by connecting impedance element to coil of step motor, and making detecting part to be operated by induced voltage which is generated at both ends of the element after breaking of driving pulse. CONSTITUTION:P shape and N shape MOS.FET gates 10-13 compose an inverter, the output is connected to coil 3 of a step motor, and at the same time, are connected to detecting resistance 16 through gates 14, 15, and output wave shape is detected by two value theoretical element 17 which has a specified gate value. Therefore, electric current which is currented in coil 3 is controlled with induced voltage after breaking of driving pulse such that the electric current is divided into two group channels of current that currents in the resistance 16 and current which does not current in the resistance 16, then two value theoretical element 17 is made to be operated, and revolution or no revolution can be surely detected by existence of the peak of the output wave shape. |
