| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that abrupt stop of a motor due to short braking causes vibration and noises if a plurality of pieces of switching elements are kept on. <P>SOLUTION: The motor drive arrangement comprises a controller 10 comprising a PWM signal generater 11, a triangular wave generater 12, a switching signal generater 17, a state detector 16, and a waveform generater 14, and an energization device 20 comprising switching element 21-26. The state detector 16 detects state of signal PWM at such timing as signal OSCCLK rises, in other words, at the timing of a lower vertex of the rectangular wave signal OSC, for generating command signal ALLOFF. With this configuration the fact that the signal that is PWM-modulated for driving a motor is not output is detected, and all switching elements are turned off. So the effect of short braking is eliminated to suppress vibration and noises. <P>COPYRIGHT: (C)2008,JPO&INPIT |
