Rotational speed controller of brushless DC motor

摘要

The present invention relates to a rotation speed control apparatus of a brushless DC motor, and when the control element 21 outputs a pulse signal to control the rotation speed of the brushless DC motor 27, the resistance R of the smoothing circuit 23 is measured. ) And capacitor C11 are smoothed and output by direct current having a voltage value corresponding to the duty of the pulse signal output from the control element 21, and the direct current signal is more stable through capacitors C12 and C13. As it is changed to and applied to the driving element 25, since its configuration is simple and occupies less space in the circuit design, the manufacturing cost is reduced and product competitiveness is improved.