| 摘要 |
PURPOSE:To sufficiently perform energy-saving effect without delaying switching by providing a detector for detecting outputs at low and high speed operation time, automatically changing the number of poles, thereby always satisfying the output required for a system. CONSTITUTION:When the opening signal of an input vane 8 of a controller 10 exceeds the vane opening theta1 set in the first detector at low speed operation time, the prescribed period signal 13 is delivered to switch the operation. If the first detector is set to the point theta1 near 100% of the vane opening at low speed operation time, it is automatically switched to high speed when the necessary system windage rises to the vicinity of the upper output limit at low speed operation time. On the other hand, if the second detector at high speed operation time is set to the vane opening theta2 corresponding to the point of windage smaller than that obtained at the set opening theta1 in the low speed range, it is automatically switched to low speed when the necessary system windage becomes a range capable of operating at low speed. |
