Abstract: A brushless motor (6) includes: a rotor (25), which rotates about a rotational axis (AX); and a stator (24), which is disposed around the rotor and comprises one or more coils (29). The rotor comprises a rotor core (31) and a rotor shaft (33), which is disposed in a shaft hole (60) of the rotor core. The rotor shaft includes: a thinner-diameter force-fitting segment (82), which is force-fit into the shaft hole with a first amount of force-fitting interference; and a thicker-diameter force-fitting segment (79), 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.

Abstract: A wire reel for rebar tying machine including a reel and a wire wound therearound and an engagement portion at which an earlier-wound part of the wire may be engaged with a later-wound part of the wire by the later-wound part of the wire sinking below the earlier-wound part of the wire. A manufacturing method of a wire reel for rebar tying machine includes: fixing one end of a wire to a reel; winding the wire around the reel by feeding the wire while rotating the reel; and stopping the feeding of the wire while rotating the reel to cause a later-wound part of the wire to sink below an earlier-wound part of the wire such that the later-wound part of the wire engages with the earlier-wound part of the wire.

Abstract: 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.

Abstract: It is an object of the present invention to provide an effective technique for easily installing many turns of a coil winding on the stator body. According to the invention, method of manufacturing a motor is provided. The motor may include a stator body, field cores, pole pieces, coil receiving parts. The method may include the steps of bending the pole pieces away from the coil receiving parts, inserting the tied coils into the coil receiving parts and bending the pole pieces bent away from the coil receiving parts toward the coil receiving parts, thereby retaining the coils in the coil receiving parts by the pole pieces. Because the pole pieces are once bent away from the coil receiving parts and then, the tied coils are inserted into the coil receiving parts, it is not necessary to retain each turn of the coil winding and therefore, number of turns of the coil winding is not restricted by the length of the pole pieces. As a result, high motor output can be ensured without uselessly upsizing the motor.