1 results about "Induced voltage" patented technology

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(=(α₅+α₇)/α₁) of a total of voltage peak values α5 and α7 of the fifth-order component and the seventh-order component to a voltage peak value α₁ 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.