| 摘要 |
<p>PURPOSE:To control the speed of the synchronous motor readily and to perform fine, resposive control by providing a pulse encoder, a reversible counting means, a computing means, and a converting means, and generating the phase of an induced electromotive voltage. CONSTITUTION:The pulse encoder 2 outputs both a position pulse train and rotary pulses. An up down counter 4 presets the position of the rotor of the synchronous motor 1 by the position pulse train and performs the reversible counting by therotary pulse. A processor 8 computes three phase current command values IU, IV, and IW from the value of costheta and the value of sintheta which are obtained based on the counted value of the counter 4. A DA converter 9 converts said three phase current command values IU, IV, and IW into analog values. In this way, since the phase of the induced electromotive voltage is generated, the synchronous motor 1 can be controlled by the similar way as a DC motor, the speed control can be made more readily, the torque generation control is made easy, and the fine, responsive control can be performed.</p> |
