| 摘要 |
PURPOSE:To reduce the cost and miniaturize it, by using DC brushless motor of three or more three phases as a stator windings and by supplying a pulsating output of a main power circuit as its power supply. CONSTITUTION:The main power circuit 1 for three-phase DC brushless motor consists of a commercial supply 2, a stepdown resistor R1, a full wave rectified circuit 3 which constructed by diodes S1-D4 and noise suppression capacitor C5. This pulse output is connected to the minus output from each stator windings 4 through the switching transistors Q of a current switching circuit 7. Moreover each base circuit of the transistors is connected to the respective output terminal of the comparator IC 5 through resistor R5-R7. IC 5 integrated the plural operational amplifier 5a-5d and the detected output of Hall element H is connected to its comparative input. A control power supply 6 supplies the power to the element H and current switching circuit 7. As a result, a stable power supply can be obtained by inserting a resistor 8 and an another rectifier D5 in the series circuit. |
