In the past, the integrated core used in the motor, the copper wire of the winding was wound around the outlet nozzle from the outlet of the winder outlet, and was wound around the magnetic pole teeth. In the integrated core, it was performed on the narrow inner diameter side. Winding, the windings in the core slot cannot reach a high density configuration. Further, since the number of slots is large, the gap ratio as the outlet passage is also increased, so that it is necessary to form a stator having a low winding density. One way to solve this problem is to sparsely separate the core. However, the number of components is increased, and the transition line between the winding and the winding is broken. Therefore, the connection point of its subsequent processes will also increase, which will bring new problems to production.
In response to this situation, the company developed an exclusive split core. This is a bendable core that is linearly unfolded by a thin body portion. Because of the linear expansion, the winding operation has a relatively large space, thereby increasing the winding density. At the same time, the transition line between the windings does not have to be cut, and the winding can be continuously wound.
The articulated core of the joint expands the linear bendable core further, and there is ample space at the tooth circumference of the magnetic pole when winding, as shown in FIG. The teeth of each pole are required to be free to bend. To achieve this goal, an articulated core with a freely curved joint was designed. The core pieces constituting the joint joints each have a lap. At the center of the turn of the lap joint, the convex and concave dark drops (pins) are machined, and when they are overlapped together, a rotatable portion (joint) like a hinge is formed. This type of core has a punching and laminating speed in the stepping die, which is the same as the previous integrated core.