| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor core which enables a motor to be manufactured at low costs and efficiently driven in a range from low speed large torque to high speed low torque.SOLUTION: A motor core includes: a core back 2 formed by a steel pipe; and teeth 3 around which a winding wire 4 is wound. The teeth 3 includes: fixed type teeth 3a fixed to the interior of the core back 2; and movable type teeth 3b which may be removed from/inserted to the outer side and inner side of the core back 2. When a rotation speed of a motor is lower than a preset reference value, the movable type teeth 3b are stored in the core back 2. When the rotation speed of the motor is higher than or equal to the preset reference value, the movable type teeth 3b are removed to the outer side of the core back 2. |
