| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an active braking mechanism for protecting a spindle motor. <P>SOLUTION: In a motor control circuit, a reverse-torque, forward commutation motor driver system for a phased motor rapidly decelerates or brakes the motor by exciting, in sequence, a complementary excitation signal in each normal commutation state of the forward-state machine so as to obtain an active braking effect. After active braking reduces the rotational velocity of the motor below a threshold, a dynamic braking technique can replace the active braking so as to set high-side drivers to a voltage opposite to that of low-side drivers. <P>COPYRIGHT: (C)2008,JPO&INPIT |
