| 摘要 |
PURPOSE:To prevent the step-out of the pulse-motor, and to drive the pulse- motor at the maximum speed within a range that the motor is not stepped out by providing a means detecting the condition of load of the pulse-motor and a means setting the condition of load of a step-out limit. CONSTITUTION:The winding currents of a pulse-motor are measured by means of a current measuring circuit 4. Limit winding currents to limit torque are previously obtained experimentally, the value is beforehand set to a comparison circuit 5, and the value and winding current value acquired by means of the current measuring circuit 4 are compared. A control circuit 6 discriminates the results of the comparison, controls pulse speed applied to a power-transistor 1, and drives the pulse-motor at the maximum speed within the range that the motor is not stepped out. |
