Patent ID: 8680731

Claim:
A permanent-magnetic type rotary electric machine comprising: a stator having teeth that are arranged in the peripheral direction of the stator and armature windings of plural phases are wound around the teeth; and a rotor having plural permanent magnets arranged so that the poles of the permanent magnets are alternately different in the peripheral direction of the rotor, wherein higher harmonic waves are contained in a no-load induced voltage waveform, wherein, when an electrical angle of 360° is set as a fundamental wave in the no-load induced voltage waveform, a (6p−1)-th higher harmonic wave and a (6p+1)-th higher harmonic wave are made substantially coincident with each other in amplitude and phase, where p is a positive integer, wherein when the no-load induced voltage waveform is represented by V(ωt) as follows by the fundamental wave, the fifth higher harmonic wave, and the seventh higher harmonic wave: V (ω t )= V 1 sin(ω t )+ V 5 sin(5ω t+α 5)+ V 7 sin(7 ωt+α 7) where V 1 , V 5 , and V 7 represent the amplitude of the fundamental wave, the amplitude of the fifth higher harmonic wave, and the amplitude of the seventh higher harmonic wave, respectively, and V 1 , V 5 , and V 7 are real numbers, α 5 and α 7 represent the phases of the fifth and seventh higher harmonic waves, respectively, ω represents the frequency of the electrical angle, and t represents the time, V 5 , V 7 , α 5 , and α 7 are respectively controlled so that V 5 and V 7 are substantially equal to each other and α 5 and α 7 are substantially equal to each other, and wherein a skew angle is set to at least one of the rotor magnets and the stator teeth so that the (6p−1)-th higher harmonic wave and the (6p+1)-th higher harmonic wave are made substantially coincident with each other in amplitude and in phase.