Patent ID: 7304446
Filing Date: 2007-12-04
Classification: H02K,H02P

Abstract:
1. A sensorless and brushless motor comprising: a stator including a stator core and a stator coil wound around the stator core; a rotor including a rotor magnet, the rotor magnet being for having a magnetic interaction with the stator core so that the rotor can have a rotation relative to the stator; a control circuit being electrically connected with the stator coil for controlling a current energizing the stator coil; and an induction coil would around the stator core and electrically connected with the control circuit, the induction coil being for being induced by the rotor magnet to produce a voltage indicating the control circuit a position of the rotor; wherein the induction coil is capable of outputting a signal to the control circuit and in response to the signal, the control circuit is capable of changing a direction of the current in the stator coil; and wherein the control circuit is mounted on a printed circuit board and the printed circuit board is disposed outside the motor.