| 摘要 |
PURPOSE:To accurately suppress vibration of a motor in a simple structure by sequentially varying the amplitudes of exciting currents to be supplied to phase windings of the motor at respective exciting coils, and moving the variation synchronously with the detected rotary position signal. CONSTITUTION:When a phase thetam and amplitude coefficient (m) to be supplied to a damping modulator MC are decided, it is divided into the case in which a rotary unbalance due to the deviation of the center of a shaft and the center of gravity is previously known and the case in which it is not previously known. In the former case, the phase thetam is fixed, and the coefficient (m) is varied in proportion to the rotating speed omegar obtained by differentiating a rotary position signal thetar. In the latter case, for example, there is no room for searching a rotary unbalance, or rotary unbalance is generated by an additive such as a tool, etc. In this case, the thetam and the m for minimizing the vibration are searched by scanning a table in a range of 0 - 2pi in terms of the phase thetam and in a range of 0 - 1 in terms of the coefficient (m). |
