Patent ID: 7292004

Claim:
A motor driving apparatus for driving a motor, said motor driving apparatus comprising: a rectifier circuit having an input to be connected to a single-phase AC power supply; an inverter circuit connected to said rectifier circuit, said inverter circuit being operable to output a current and a voltage to the motor; and an inverter control unit operable to control said inverter circuit so as to drive the motor; wherein said inverter control unit includes a power supply voltage estimation unit operable to estimate a voltage of the single-phase AC power supply, and said inverter control unit is operable to change the value of the current or voltage outputted from said inverter circuit so that a waveform of an input voltage of said inverter circuit which is outputted from said rectifier circuit to said inverter circuit becomes equal or approximate to an absolute value of a waveform of an output voltage of the single-phase AC power supply, based on the power supply voltage estimated by said power supply voltage estimation unit.