FIXING METHOD AND FIXING STRUCTURE FOR FIXING A COIL INSULATOR, STATOR USING THE SAME AND ROTATING ELECTRICAL MACHINE USING THE SAME

摘要

A fixing method for fixing a coil insulator which is provided between a stator core 5 including a back yoke 7 and a plurality of teeth 8 projecting in the radial direction from the back yoke 7, and a coil 6 wound around the stator core 5, to the stator core 5, includes preparing the stator core 5 in which a fixing hole 11 is formed corresponding to a respective one of the teeth 8, on an end face in the axial direction of the back yoke 7, and preparing a plurality of coil insulators 12 which include each a main body 14 composed of a heat-softenable insulating material and arranged on the circumference of a respective, one of the teeth 8, and a fixing portion 20 which is projected in the radial direction from the main body 14 and covers the fixing hole 11. Each coil insulator 12 is arranged on the circumference of a respective one of the teeth 8 by fitting thereto. By softening the fixing portion 20 by heating to bring part of the insulating material into the fixing hole 11 and then hardening the fixing portion 20, a projection 22 for fixing the coil insulator 12 to the stator core 5 is formed.

主权项

1. A fixing method for fixing a coil insulator to a stator core, the coil insulator provided between a stator core and a coil, the stator core including an annular or substantially arc-shaped back yoke and a plurality of teeth projecting in a radial direction from the back yoke, the coil being wound around the stator core, the fixing method comprising:
preparing the stator core in which at least one fixing hole is formed corresponding to a respective one of the teeth, on an end face in an axial direction of the back yoke; preparing the coil insulator, the coil insulator being provided on a circumference of the respective one of the teeth of the stator core, the coil insulator being composed of a heat-softenable insulating material, the coil insulator including a main body to be arranged on a circumference of the respective one of the teeth and a fixing portion projecting in the radial direction from the main body, and the fixing portion that covers the at least one fixing hole; arranging the coil insulator on the circumference of the respective one of the teeth by fitting to the respective one of the teeth; and softening by heating the fixing portion to bring part of the insulating material into the at least one fixing hole and then hardening the fixing portion to form at least one projection fixing the coil insulators to the stator core.