| 摘要 |
PURPOSE:To enable to readily alter the frequency, amplitude, phase and waveform of an energization command signal by obtaining the command signal of variable phase which is subjected to pulse width modulation. CONSTITUTION:An energization command generator 6 has a latch circuit 61 which receives upper bit group data of theta0 of an inputted reference signal and produces an upper phase signal thetaH, and a pulse width modulator 62 which inputs a lower bit group data of the signal theta0 and produces a lower phase signal thetaalpha pulse-width modulated. These outputs and hence the upper and lower phase signals thetaH, thetaalpha are added by an adder 63, and a repetitive phase angle signal theta1 is inputted together with an energization control signal S to a memory circuit 64. The signal S from the memory circuit 64 and a digital energization command signal D outputted corresponding to the time change of addressing to the phase signal theta1 are analog converter by a D/A converter 65, and harmonic components are removed by a filter 66, thereby obtaining an energization command signal NS. |
