| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sensorless control method and apparatus of an analog brushless motor which can cope with sharp acceleration and deceleration. <P>SOLUTION: Integrator circuits 10u, 10v, 10w have an OP amplifier 13 and a capacitor circuit 14 connected in parallel. The integrator circuits 10u, 10v, 10w and comparison circuits 11u, 11v, 11w are used and generate analog rotational position estimating signals Hu, Hv, Hw from three phase voltages Vu, Vv, Vw. The brushless motor, using a permanent magnet, is controlled without a rotational position detecting sensor by controlling currents carried from a DC power supply to three phases, based on the rotational position estimating signals. The capacitance of the capacitor circuit 14 is switched, based on the rotational speed. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
