Although the coils and other parts of the motor […]
Although the coils and other parts of the motor have a certain insulation capacity when they are made into the stator and rotor, for example, the enameled wire is insulated by a paint film as a conductor; there is a slot insulation in the core slot. However, a thin layer of paint film on the enameled wire is used as wire insulation, which is very weak and easily damaged. The enameled wire, slot insulation, and slot wedge move to each other. When the motor starts and stops, the insulating material must withstand electromagnetic and mechanical vibration. The impact is also subject to the erosion of moisture, dust, salt spray in the air, and corrosive gases or droplets in the working environment, and is subject to the aging of heating conditions during operation. In this condition, the motor must work with the coil and its Adjacent parts are impregnated with insulating varnish, so that insulating parts such as wire and slot insulation are encapsulated with insulating resin to form a dense and solid whole.
It is found from the investigation of power tool users that the most common motor failures in use are winding breakdown, winding short circuit, winding open circuit, winding burnout, etc. These are all motor insulation problems. The length of the motor life mainly depends on the insulation quality, and the quality of the motor insulation is not only related to the insulation structure of the motor, but also related to the insulation treatment of the motor. Insulation structure is a design issue, and insulation treatment is a manufacturing process issue. Therefore, in order to ensure the long-term reliable operation of the motor, once the insulation structure is designed and shaped, insulation treatment is a key link in motor manufacturing.