DIVIDED CORE FOR MOTOR STATOR, MOTOR STATOR USING IT, PERMANENT MAGNETIC TYPE SYNCHRONOUS MOTOR, AND PUNCHING METHOD USING PUNCHING MOLD FOR DIVIDED CORE

摘要

Conventional permanent magnetic type synchronous motors have reduced cogging torque by displacing the permanent magneto of the rotor in a circumference direction or by displacing the stator core in a circumference direction. Such skewing, however, causes the motor output to decrease and, in addition, it has been impossible to automate wire-winding work, resulting in an expensive motor. To solve these problems, a divided core is provided, with which the wire-winding work can be automated and an inexpensive and high-output motor can be obtained. The divided core (100) comprises a laminated iron core formed by a teeth (6), and a yoke (5) and a pole piece (9), which are connected to both ends of the teeth (6). A plurality of the divided cores are arranged in a ring shape to form a stator. In this divided core (100), both ends of the yoke (5) and both ends of the pole piece (9) are displaced in one direction of circumference directions in each laminated iron core from the laminated top layer toward the laminated bottom layer of the divided iron core.