| 摘要 |
<p>PURPOSE:To eliminate radio noise generated from a motor driving circuit of an electrically-operated power steering device. CONSTITUTION:An electrically-operated power steering device is provided with a motor driving circuit 9 comprising four switching elements FET 2a, 2b, 2c and 2d and boot strap circuits, and with a control device 5 for carrying out interrupting and switching of polarity of the motor 1 based on a detected torque from a torque sensor 6 and a detected car speed from a car-speed sensor 11 so as to control a steering force auxiliary amount. On/off of the FET 2a, 2b, 2c and 2d constituting a bridge circuit is controlled by a signal from this control device 5. And both terminals of the motor 1 are connected to a connection between the FET 2a and 2c and a connection between the FET 2b and 2d. As a booster circuit required for the conventional constitution is not used, radio noise is not generated.</p> |
