| 摘要 |
PROBLEM TO BE SOLVED: To increase magnetic flux at a rotor side and prevent an effect of a field system side and high-temperature demagnetization in a brushless motor where a discoid magnet is arranged between rotor cores having protrusion pieces on their outer periphery.SOLUTION: A brushless motor 1 has a stator 2 and a rotor 3. The rotor 3 comprises rotor cores 33a and 33b separately arranged along a rotation axis 31 and a magnet 34 arranged between the rotor cores 33a and 33b. Solenoid coils 51a and 51b are provided in the vicinity of both ends of the rotor 3 in the axial direction. The solenoid coils 51a and 51b are installed on the stator 2 and form a magnetic field Hs in the same direction as a direction of a magnetic field Hm formed in each of the rotor cores 33a and 33b by the magnet 34. The magnetic field Hm is strengthened by the field magnetic field Hs, thus preventing an effect of armature reaction due to current on the stator 2 and demagnetization at high and low temperatures. |
