| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for driving a brushless motor capable of preventing overshoot, improving operational efficiency, and stably driving its rotation from the start. <P>SOLUTION: This brushless motor 50 is controlled so as to drive the motor by increasing the frequency of a rotating field generated at an armature winding 52 and a duty ratio of voltage applied to the motor from the start in a prescribed pattern. When a compulsory rotation period elapses from the start or the frequency reaches a target frequency during the compulsory rotation period, it is controlled so as to drive it based on a pole position of a magnet rotor 54. When the frequency is increased in the prescribed pattern, the period to reach the target frequency is obtained, the obtained period is taken as the compulsory rotation period, and the motor is controlled so as to drive it by increasing the frequency and the duty ratio in the prescribed pattern until the compulsory rotation period elapses from the start, thus controlling the motor so as to drive it based on the pole position of the magnet rotor 54 when the compulsory rotation period elapses. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
