Starting method for a motor

A starting method of a motor is provided to arrange a rotor placed on an arbitrary angle to an initial position by initially starting a three phase synchronous motor in which a unit for detecting a position of the rotor is not provided. A control part(11) controls rotation of a motor by controlling a power inputted to a coil(10). A PWM operator(51) receives a signal of a stationary coordinate system, and generates a PWM signal. An inverter(52) receives the PWM signal, and directly controls a power inputted to the motor. A current detecting part(53) detects a d-axis current and a q-axis current as a present current outputted in the inverter. A command voltage outputted in a current controller(43) is converted into a voltage of the stationary coordinate system through a coordinate converting part(44).