| 摘要 |
<p>PURPOSE:To enable drive control equivalent to a DC motor by detecting the phase of the induced electromotive voltage of a synchronous motor, generating a current command having this phase and applying the current command to the armature coil of the synchronous motor. CONSTITUTION:A deviation ER between a speed command voltage VCMD and the actual speed voltage TSA of a synchronous motor 101 is calculated by an arithmetic circuit 106, an amplitude corresponding signal of an armature current is inputted to arithmetic circuits 108, 109 through an error amplifier 107, is multiplied by the position signals sin theta', cos theta' of field poles through a resolver 102, a synchronous rectifier 103 and a phase leading circuit 104, and 3-phase current commands Iu-Iw of the same phases as the induced voltage can be obtained through 2-phase/3-phase converter 11. The difference from the actual phase currents Iau-Iaw are calculated by arithmetic circuits 111U-111W, the difference signals are inputted to a pulse width modulator 115 through current amplifiers 114U-114W, and are converted into inverter drive signal.</p> |
