| 摘要 |
PURPOSE:To conduct stable drive resulting in little torque fluctuation by mounting a temperature sensor to a stepping motor and transmitting a signal from the temperature sensor over a current setting circuit. CONSTITUTION:A temperature sensor 4 is fitted to a stepping motor 1, a signal from the temperature sensor 4 is transmitted over a current setting circuit 3 in a constant-current drive circuit 2, and set currents are lowered and the increase of torque is inhibited when the temperature of the stepping motor is elevated and torque intends to rise. When the temperature lowers and torque intends to reduce, on the contrary, feedback through which set currents are increased and the reduction of torque is inhibited is applied, thus suppressing torque fluctuation due to the temperature. Accordingly, a step-out and mechanical vibrations resulting from torque fluctuation are restrained. |
