| 摘要 |
PURPOSE:To reduce time for exciting the specific phase of the armature winding of a brushless motor and switch mode smoothly. CONSTITUTION:In the control device of a brushless motor, a control part 10 switches the brushless motor to synchronous operation and then stops the motor or stops the rotor of the brushless motor by exciting the specific phase of an armature winding. At this time, the position of the rotor is detected, at the same time the same position information is stored at a memory part 9, and the position information is stored at the internal memory of an indoor machine microcomputer 8 in the case of an air conditioner, for example. If start command and position information from the indoor machine microcomputer 8 are received when starting the brushless motor 1 for the second time or thereafter, the specific phase of an armature winding 1a is successively excited for performing synchronous stating operation, then drive frequency and drive signal ON duty ratio are increased gradually, and then mode is switched when the electromotive force generated at the armature winding 1a becomes sufficiently large. |
