| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a DC motor drive unit provided with a means that protects a control part from static electricity and noise by discharging them via a shaft of a DC motor connected to the drive unit not via the control part, when the static electricity and the noise applied to a controlling DC power supply do not flow to an earthing line via a Zener diode. <P>SOLUTION: The DC motor drive unit 1 comprises: a motor drive part 3; the control part 4; a driving power supply line 5; a controlling power supply line 6; and the common earthing line 7. When the static electricity and the noise are applied to the controlling power supply due to arrangements of a protection element 10 between the driving power supply line 5 and the controlling power supply line 6, and the Zener diode 13 between the controlling power supply line 6 and the earthing line 7, the static electricity and the noise are discharged to the driving power supply line 5 or the earthing line 7 via either the protection element 10 or an element of the Zener diode 13 not via the control part 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
