| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving equipment which, regardless of the stop position of a rotor, can always start up accurately and rapidly a sensorless and commutatorless DC motor wherein induced voltage signals from armature windings are processed by a rotor position signal generating circuit and then a rotor position signal is obtained and then driving current is supplied to the armature windings of respective phases U, V, W, being reversed every other one cycle, six times, and thereby the rotor is driven. SOLUTION: At the time of start-up, a start-up signal generating circuit 17 generates a start-up signal which reverses a rotor every other one cycle, six times, and then fixes the rotor to a stop phase for a specified period of time and then rotates the rotor in the forward direction. The signal is supplied to an armature winding driving circuit 10. When the rotational speed of the rotor increases enough to induce sufficient voltage in armature windings 6, a switching circuit 13 is switched and normal operation is started by a positional signal from a rotor position signal generating circuit 11. |
