| 摘要 |
PURPOSE:To facilitate assembling and to reduce the cost of a brushless motor by forming a magnetic encoder which is also used as a magnet rotor, thereby eliminating a position detector. CONSTITUTION:A rotor is formed of a rotational shaft 5 and a magnet rotor 6. The rotor 6 is formed by integrating plastic magnets 14, 15 at both sides of a rotor yoke 7. Poles 16 for a magnetic encoder are formed on the outer periphery of the magnet 14. The poles 16a, 16b for the encoder and an origin signal magnetizing unit 17 are detected by magnetic sensors 10-1, 10-2, 10-3 provided on a printed board 9, and the rotating speed of the motor is controlled on the basis of the detection signals. |
