Patent ID: 7262568

Claim:
A brushless DC motor coupled directly to an AC source, the motor comprising: (a) a stator including a stator coil; (b) a rotor including a rotor magnet; (c) a magnetic flux sensor for sensing magnetic-flux of the rotor magnet; (d) an inverter circuit including a plurality of switching elements coupled in a full-wave bridge having an upper arm and a lower arm; (e) a plurality of AC source couplers; (f) a rectifier for full-wave rectifying a voltage of the AC source; (g) a DC voltage converter for converting a rectified voltage supplied from the rectifier into a low DC voltage, and for applying the low DC voltage to the inverter circuit as a power supply; (h) a controller for controlling the inverter circuit based on a signal supplied from the magnetic flux sensor such that the low DC voltage is supplied to the stator coil in a full-wave driving method; and (i) a current controller for regulating an average current value applied to the inverter circuit constantly at a set current; (j) a set current changer for changing the set current regulated by the current controller; wherein the set current changer changes the set current regulated by the current controller in response to which terminals of the AC source couplers are coupled to the AC source.