| 摘要 |
PURPOSE:To reduce torque loss by iron loss by constituting a stator yoke section oppositely faced to the pole face of a rotor of a magnetic material. CONSTITUTION:A plane plate opposed-type brushless motor 12 is composed of a permanent magnet rotor 4, one plane section 2 thereof is magnetized to a plurality of predetermined poles, a stator yoke 13 and a stator 14 consisting of a plural phase of shunt coils 8. A section oppositely faced to the pole face of the permanent magnet rotor 4 is organized of a fixed plate 13b made of a magnetic material in the stator yoke 13 at that time, and the stator yoke 13 forms a magnetic circuit together with the rotor 4. Consequently, magnetic flux generated from the pole face of the rotor 4 is focused to the fixed plate 13b, and leakage flux to sections except the fixed plate 13b is reduced. Accordingly, the density of magnetic flux is increased, thus improving the efficiency of the motor. |
