For different series of motors, the materials or parts of the motor winding and bearing system will be determined in combination with the actual operating conditions of the motor. If the actual operating temperature of the motor is high or the temperature rise of the motor body is high, the bearings of the motor, The properties of grease, motor winding magnet wire and insulation materials must match their actual needs, otherwise it is very likely to cause quality problems during the operation of the motor, and in severe cases, the motor will burn out.
The materials that determine the heat resistance level of motors mainly include magnet wires and insulating materials. Among them, enamelled magnet wires are commonly used in small and medium-sized motors. The main indicators that characterize the insulation performance of magnet wires are paint film thickness and heat resistance grade. 2 Grade 3 paint film magnet wire is the most commonly used, and some manufacturers will choose to thicken the paint film magnet wire when necessary, that is, 3 grade paint film thickness; for the heat resistance grade of magnet wire, 155 grade is more commonly used, in order to increase the quality and reliability of the motor Many motor manufacturers choose 180-grade magnet wire, and for occasions with high operating temperature or larger motors, they often choose 200-grade magnet wire.
When selecting a magnet wire with a higher heat resistance level, the performance level of the insulating material used in the winding process must match it, and the basic control principle is not lower than the insulation level of the magnet wire; at the same time, in order to ensure that the motor winding The performance level meets the requirements, and the vacuum impregnation process will effectively enhance the insulation performance and mechanical performance level of the winding.
In the process of motor repair, some repair units do not have the process control requirements for repairing large-scale products, which will cause the performance level of the motor windings to fail to meet the requirements. Some windings may barely pass the inspection during the processing process. When the motor is actually put into use Finally, the defects in the manufacturing or repair process will be exposed, and in severe cases, the motor windings will be directly burned.
In the actual manufacturing and repair process, if there is a necessary material substitution, the principle of high insulation performance level should be followed to prevent quality failures during the operation of the motor.
Post time: Apr-20-2023