Patent ID: 6369481
Filing Date: 2002-04-09
Classification: H02K,H02P

Abstract:
A polyphase (N phase: N being a positive integer greater than or equal to 3) reluctance motor comprising:a rotor formed of a soft magnetic substance which is provided with n units of salient poles (n being a positive integer greater than or equal to 2) of the same width and the same interval in a circumferential direction thereof; a stator having mÃ—n (m is an integer greater than or equal to 3) units of magnetic poles which are formed by winding an armature coil around each two adjacent slots out of mÃ—n units of slots formed at equal intervals in a circumferential direction thereof, said armature coils being connected to constitute a first-phase armature coil, a second phase armature coil, a third-phase armature coil, through an Nth-phase armature coil; means for rotatably supporting said rotor with respect to said stator armature so that said salient poles of said rotor and said magnetic poles of said stator confront each other through a slight gap; position detecting units for detecting a rotational position of each salient pole of said rotor, and outputting first-phase, second-phase, third-phase, through Nth-phase position detection signals of the same width, which are successively delayed by a predetermined period; semiconductor switching elements connected in series to each of said first-phase armature coil, second armature coil, third-phase armature coil, through Nth-phase armature coil; a DC power source which supplied power to each of said phase armature coils through said semiconductor switching elements connected in series therewith; and a power-supply control circuit for controlling the activation of said semiconductor switching elements according to said first-phase, second phase, third-phase, through the Nth-phase position detection signals outputted from said position detecting units, so that said first-phase armature coil may be supplied with power simultaneously with said second-phase armature coil during a section, said second-phase armature coil may be supplied with power simultaneously with said third-phase armature coil during a section, through said Nth-phase armature coil which may be supplied with power simultaneously with said first-phase armature coil during a section, wherein a first magnetic pole formed in said stator is magnetized simultaneously with a second magnetic pole adjacent thereto in a predetermined direction in a manner such that one is a magnetized North pole while the other is a magnetized South pole, then, the second magnetic pole is magnetized simultaneously with a third magnetic pole adjacent thereto in a predetermined direction in a manner such that one is a magnetized North pole while the other is a magnetized South pole, and then, the third magnetic pole adjacent thereto in a predetermined direction in a manner such that one magnetized North pole while the other is magnetized South pole up to mÃ—n magnetic poles, thereby generating a leakage flux passing through one of two adjacent magnetic poles, of which a confronting area with a salient pole is smaller, which Is effective for developing a torque between the magnetic poles and the salient pole, and of which quantity is determined according to the quality of the magnetic flux passing through the other of the above adjacent magnetic poles.