| 摘要 |
PROBLEM TO BE SOLVED: To provide a balancing piece fixing structure of a brushless DC motor which can be readily assembled and fix a balancing piece and will not cause the problem of magnetic induction between the magnetic pole piece of a stator and a shaft tube. SOLUTION: The case body is provided with a storage chamber, and a shaft hole seat is projected in the storage chamber, and the shaft hole seat is used for the shaft tube of the stator to be set, and the inside peripheral wall of the shaft tube of the stator is used for a rotor to be pivoted for rotation, and a permanent magnet is mounted at the inside peripheral wall of the rotor. The outside peripheral wall of the shaft tube of the stator is used for the center hole of a balancing piece to be fitted in, and a gap is made between the center hole and the shaft tube, and the balancing piece is made of a magnetic material, and attractive force for attracting each other is generated with the permanent magnet of the rotor. A nonpermeable ring is made of a nonmagnetic material, and the magnetic piece at the lowermost end of the stator and the balancing piece are isolated so that they do not contact with each other by the use of a flat ring; and an annular collar is made projected at the nonpermeable ring, and the annular collar is interposed in the space between the center hole and the shaft tube.
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