| 摘要 |
An electronic control circuit for brushless direct current motor, of the type having a coiled stator and a permanent magnet rotor, with an inverter circuit (10) feeding current to stator coils (21, 22, 23). A rotor-stator relative position detecting circuit (30) and a central controller (70) processes current information fed by the inverter (10), on the reference speed and the relative rotor-stator position, and sends command signals to inverter (10). The detecting circuit (30) has low pass filters (1, 2, 3) connected to terminals (O1, O2, O3) for supplying current to the motor coils, and with the output (F1, F2, F3) of each low pass filter being connected to the noninverting input of a corresponding voltage comparator (59, 60, 61) through a capacitor (56). The inverting input (M1, M2, M3) of each voltage comparator (59, 60, 61) receives the output of AC corresponding filter through a capacitor (56) which causes a phase delay and also through a resistor (54) of an integrating resistor circuit interconnected at a common point (M). The detecting circuit (30) further comprises another resistor circuit (55) which connects said point (M) to each inverting input of the voltage comparators.
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