Abstract: A motor has a two rotors which are independently operated using a single inverter and without being supplied with a complex current. Further the motor is capable of shifting a rotation direction of each of two rotors by performing a magnetizing operation one time and reversing polarities of the shifting magnets when a mode of the motor is shifted from a synchronous mode in which the first rotor and the second rotor rotate in the same direction to a counter mode in which the first rotor and the second rotor rotate in opposite directions, and shifting the mode of the motor to the counter mode while the magnetizing operation is performed one time times and relative positions of the first rotor and the second rotor are changed when the first rotor and the second rotor inertially rotate in the synchronous mode.

Abstract: A motor has a two rotors which are independently operated using a single inverter and without being supplied with a complex current. Further the motor is capable of shifting a rotation direction of each of two rotors by performing a magnetizing operation one time and reversing polarities of the shifting magnets when a mode of the motor is shifted from a synchronous mode in which the first rotor and the second rotor rotate in the same direction to a counter mode in which the first rotor and the second rotor rotate in opposite directions, and shifting the mode of the motor to the counter mode while the magnetizing operation is performed one time times and relative positions of the first rotor and the second rotor are changed when the first rotor and the second rotor inertially rotate in the synchronous mode.

Abstract: Disclosed is a magnetic flux concentrated-type brushless motor performing field weakening control and reducing iron loss. The teeth of the stator are provided with a stator-side wide-width portion, and the rotor is provided with magnetic members having a rotor-side wide-width portion, and magnets disposed between the magnetic members. The motor is driven for a certain time in a low rate of rotation (LRR) section and a high rate of rotation (HRR) section. Field weakening control is performed in the HRR section. When the number of pairs of opposite poles of the rotor is P, a length of a radial line of the rotor-side wide-width portion R, a thickness of the stator-side wide-width portion Lt, a central angle of the stator-side wide-width portion ?t, a central angle the rotor-side wide-width portion ?r, and a central angle between any two neighboring magnets ?M, the motor is set such that ?r?2.85×?m?2.65×?t and (Lt×P)/(??×R)??t/?m?0.6.

Abstract: Disclosed is a magnetic flux concentrated-type brushless motor performing field weakening control and reducing iron loss. The teeth of the stator are provided with a stator-side wide-width portion, and the rotor is provided with magnetic members having a rotor-side wide-width portion, and magnets disposed between the magnetic members. The motor is driven for a certain time in a low rate of rotation (LRR) section and a high rate of rotation (HRR) section. Field weakening control is performed in the HRR section. When the number of pairs of opposite poles of the rotor is P, a length of a radial line of the rotor-side wide-width portion R, a thickness of the stator-side wide-width portion Lt, a central angle of the stator-side wide-width portion ?t, a central angle the rotor-side wide-width portion ?r, and a central angle between any two neighboring magnets ?M, the motor is set such that ?r?2.85×?m?2.65×?t and (Lt×P)/(??×R)??t/?m?0.6.