Power-consumption calculating method of motor driving device, and control method of motor driving device using the power-consumption calculating method
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United States of America Patent
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Jul 22, 2014
Grant Date -
May 10, 2012
app pub date -
Jul 8, 2010
filing date -
Jul 8, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
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).
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