ELECTRIC MOTOR FOR WELL PUMP

PURPOSE:To insert or pull out a cap by a manual operation by a method wherein the tip of a cap-mounting part is formed as a key-shaped stopper and cut parts are formed in several places out of the whole circumference of the mounting part. CONSTITUTION:A key-shaped stopper part is formed at the tip of a mounting part, a size De is formed to be a size which is a little smaller than the size of a hole at the inside-diameter part of an engineering plastic bearing, a size D3 is formed to be a size which is nearly identical to the size, and a size D4 is formed to be a size which is a little larger than the size. In addition, cut parts 7b are formed in several places out of the whole circumference of the mounting part. A cap is inserted by hand, and the tip of the mounting part is narrowed to the side of the inside diameter. The size D4 is first larger than the size of an engineering plastic hole, it is then made gradually small, and it is finally made equal to the engineering plastic hole 3a, and the cap 7 is inserted to the inside of a motor. Then, the size D4 is finally released from an external force in a part where the engineering plastic hole 3a is ended, it is returned to a size which is larger than the initial engineering plastic hole, and the mounting operation of the cap is completed. Once the mounting operation is completed, a stopper 7a is hooked to the engineering plastic hole 3a. As a result, when the title motor is used normally, the stopper is not detached simply.