| 摘要 |
PURPOSE:To smoothly start a motor and to enhance the efficiency at load time by altering a timing for switching a winding current at starting and load times. CONSTITUTION:The rotary position of a rotor 2 is detected by a sensor 3, the sensor output signal is amplified through a rotary position detector 4 as an electric signal. The rotating speed of the rotor 2 is detected by a rotating speed detector 5, and when it is less than certain constant speed N, the switching timing of the current flowed to a winding 1 is set by a controller 6 to coincide with geometrical neutral point, and when it is the speed N or larger, it is set by a controller 6 so that the timing coincides with the electric neutral point in full load state, thereby flowing a winding current through a driver 7 and a switching transistor 8. |
