The motor manufacturer reminds that for three-phase asynchronous motors, the stator windings have two connection methods: triangle and star. The star connection is to connect the tails of the three-phase windings together, and the heads of the three-phase windings are connected to the power supply.

　　The star connection method has two environments: the outer star connection and the inner star connection. In the inner star connection motor, the star point of the three-phase windings is firmly fixed on the appropriate part of the stator winding. There are three outlet ends to lead out, while the outer star connection is The head and tail of the three-phase winding are all led out, and the connection and wiring are carried out on the outside of the motor.

　　三角形接法是将某一相绕组的头与另一相绕组的尾毗连即U1连W2，V1连U2，W1连V2，毗连点与电源接线。

　　The motor manufacturer reminds that for ordinary three-phase asynchronous motors, the penalty will be divided according to the power. The motor is divided according to the power of 3kW, and the motor is connected according to the star if it is not higher than 3kW. The motor above 3kw is connected according to the angle, and for the variable frequency motor, according to For the 45kW boundary, the star connection is not higher than 45kW, and the high-power motor higher than 45KW is connected by the angle; while for lifting and metallurgical motors, there are more star connections, and large-size lifting motors will also be connected to the corner.

　　The voltage of high-power high-voltage motors is mostly rated current of 3kv/6kv/10kv, so the star connection method is generally recovered, and the goal is to prevent the windings of high-power high-voltage motors from directly suffering from higher voltages.In the star connection, the line current is the phase current, and the line voltage is 3 times the root of the phase voltage (in the delta connection, the line voltage is the phase voltage and the line current is √3 times the phase current), so the motor The voltage experienced by the winding is relatively low.In high-voltage motors, the current is often small, and the requirements for the insulation grade of the motor are higher. Therefore, it is more economical to recycle the insulation of the star-connected motor for longer treatment.