| 摘要 |
Accurate power consumption is calculated without raising cost, or making the device bigger. Power consumption (P) upon driving a motor is calculated from an input voltage (Vdc), a switching duty factor of a switching device (Sw1) of a chopper circuit (ch), which is provided with the switching device (Sw1) and a reactor (Ldc), a reactor current (Idc), motor winding reactance (Lm), and motor rotation speed (N), in a motor driving device wherein: the input voltage (Vdc) inputted to the chopper circuit (ch) is stepped down by the chopper circuit (ch); DC power outputted by the chopper circuit (ch) is converted to AC power by driving an inverter (INV) with 120-degree conduction, and outputted to a motor (M); and surge voltage to be generated when the inverter (INV) undergoes commutation is clamped to the input voltage (Vdc), by a diode (D1) connected in inverse-parallel to the chopper circuit (ch). |
