| 摘要 |
<p>A motor drive apparatus of the invention includes an inverter circuit for converting a DC power into an AC power, a plurality of motors driven by the inverter circuit, a load relay for switching an output from the inverter circuit to the plurality of motors, a current detecting unit for detecting a motor current; and a control unit for controlling the motors according to a current signal from the current detecting unit. The current detecting unit comprises a shunt resistance and a current detecting IC including a differential amplifying circuit with a changeable gain, and the control unit controls the motors by switching the load relay and the gain of the current detecting IC. In this manner, the current detecting unit is reduced in size, and a reduction in size, a reduction in number of components, and a reduction in cost of the motor drive apparatus can be realized.</p> |
