| 摘要 |
<P>PROBLEM TO BE SOLVED: To shorten the time required for bringing up/down and the changing speed of a DC brushless motor by improving response of the DC brushless motor. <P>SOLUTION: A DC brushless motor control system comprises a target rotational speed detecting circuit 111, a difference detecting circuit 112, a digital signal generating circuit 113, a D/A conversion circuit 114, a pulse width modulation circuit 115, a drive circuit 116, a rotational speed detecting circuit 118, and an amplifier 119. When the difference detecting circuit 112 detects a difference between the target rotational speed and the detected rotational speed of a DC brushless motor 117, the digital signal generating circuit 113 generates a digital signal corresponding to the difference, and the D/A conversion circuit 114 converts the digital signal to an analogue signal while the pulse width modulation circuit 115 generates PWM signal having the pulse width corresponding to the analogue signal. The drive circuit 116 controls a drive power of an FET selected by a phase excitation signal from a plurality of FETs using the PWM signal, for driving the DC brushless motor 117. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
