In recent years, motor maintenance has been frequently reported on television news and online news. The frequent occurrence of motor accidents is due to some workers not following rules or cutting corners during construction. When repairing high-voltage motors, it is necessary to follow the construction steps and specifications of the national motor maintenance standards. Correct maintenance of high-voltage motors is to reduce the occurrence of motor accidents and ensure the safety of life.

1. Power outage is the first and most critical step when performing maintenance work on the motor. If maintenance work is carried out on the motor without power outage, the high voltage of the motor can cause injury to the human body. The voltage coefficient of the high voltage is very high, which can lead to physical disability in mild cases and death in severe cases. Therefore, power outage is the first step and must be done during motor repair.

2. Insulation: After the disassembly of the motor is completed, the plug of the power supply needs to be sealed with insulation material (insulation cloth or paper), and the shell and remaining wire heads must be short-circuited and grounded. People belong to a type of conductor, and electric current can move within the human body. To prevent electric shock from causing motor accidents and causing casualties, insulation work must be done well.

The stator winding is the circuit part of a three-phase motor, which has a three-phase winding. When a three-phase symmetrical current is applied, a rotating magnetic field is generated. The three-phase winding is composed of three independent windings, and each winding is connected by several coils. Each winding is a phase, and each winding has a 120 ° electrical angle difference in space. The coil is wound with insulated copper wire or insulated aluminum wire. Small and medium-sized three-phase motors often use round enameled wires, while the stator coils of large and medium-sized three-phase motors are wound with large cross-section insulated flat copper or aluminum wires, and then embedded into the stator core slot according to a certain pattern. The six outgoing terminals of the stator three-phase winding are all led to the junction box, with the first end labeled as U1, V1, W1, and the end labeled as U2, V2, and W2. The arrangement of these six outgoing terminals in the junction box can be connected in a star or triangle shape.