Makita Corporation

Mitsuo Suenaga

Shinichi Fukatsu

Keisuke Sugiura

Keita Mizukoshi

A brushless motor () includes: a rotor (), which rotates about a rotational axis (AX); and a stator (), which is disposed around the rotor and comprises one or more coils (). The rotor comprises a rotor core () and a rotor shaft (), which is disposed in a shaft hole () of the rotor core. The rotor shaft includes: a thinner-diameter force-fitting segment (), which is force-fit into the shaft hole with a first amount of force-fitting interference; and a thicker-diameter force-fitting segment (), which is disposed at a location different from that of the thinner-diameter force-fitting segment in a front-rear direction parallel to the rotational axis and which is force-fit into the shaft hole with a second amount of force-fitting interference that is larger than the first amount of force-fitting interference.

Brushless motor, electric work machine, and brushless-motor manufacturing method

A device for manufacturing a motor is disclosed. The motors to be manufactured have a stator body including a stator of the motor, field cores that protrude from the inside surface of the stator body, pole pieces that extend from the field cores to cross with the field cores, coil receiving parts defined by a space facing the field cores, the pole pieces and the inside surface of the stator body, and coils retained in the coil receiving parts. The device has first jigs that extend in the longitudinal direction of the stator body and retain the pole pieces as well as a second jig that extends in the longitudinal direction of the stator body. The second jig has a pressing part corresponding to the arcuate shape of the pole pieces. The device further includes a pressing mechanism that presses the first jigs retaining the pole pieces away from the coil receiving parts, thereby bending the pole pieces away from the coil receiving parts.

Growing community of inventors

Anjo, Japan

Mitsuo Suenaga