| 摘要 |
In a brushless motor having a stator including armature windings for a plurality of phases, and a rotor including a permanent magnet and being rotatably disposed inside or outside of the stator, an inter-phase induced voltage waveform between two different phases in the armature windings is a trapezoidal waveform formed by superimposing a fifth-order component and a seventh-order component on a first-order fundamental wave. A content rate X(=(alpha5+alpha7)/alpha1) of a total of voltage peak values alpha5 and alpha7 of the fifth-order component and the seventh-order component to a voltage peak value alpha1 of the first-order fundamental wave is preferably set to a range of 0.01<=X<=0.1, and more preferably to a range of 0.02<=X<=0.09.
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