What will happen if one phase of the yb3 three-phase motor is missing when starting

       Phase loss operation of a three-phase motor means that one phase of the three-phase power supply of the stator winding of the motor is missing. If this state continues for a long time, the motor will overheat due to the long-term high current, and in severe cases, it will smoke, catch fire and burn down. Below, the yb3 three-phase motor manufacturer - Shanxi Jinxinrui Trading Co., Ltd. will explain in detail what will happen if one phase of the yb3 three-phase motor is missing when starting:

       During the operation of a three-phase asynchronous motor, if one phase is suddenly missing, the motor's speed will quickly decrease. At this time, the motor's stator winding current will also increase a lot, and an abnormal "buzzing" sound will be emitted. In this case In this case, the motor cannot run for a long time, otherwise the three-phase motor will be burned. We can use a jingle to remember the dangers of three-phase motor phase loss operation, that is, "Don't wait for motor phase loss, and the disaster can be avoided if you eliminate it as soon as possible."

       Causes of phase loss in three-phase motors

       The causes of phase loss of three-phase motors can generally be summarized into two types: external and internal of three-phase motors: External
       causes of phase loss of three-phase motors:
       Common in a large number of maintenance cases are the wiring screws in the motor junction box. Loose;
       secondly, the connection points in the three-phase power circuit are loose or oxidized. For example, the contacts of some contactors are in poor contact or the contact resistance is large, causing the power supply to lose phase;
       and the fuse in the fuse is broken or No fastening etc.

       Internal causes of phase loss in three-phase motors:
       Internal causes are generally rare, usually the lead wire of the three-phase motor is broken. At this time, we can measure the DC resistance of the three-phase winding. If the resistance of one phase is very large or infinite, then this winding is the open circuit phase. If the three-phase resistance is basically balanced, then the cause of the motor can be ruled out.

       Therefore, the operation of the three-phase motor with a lack of phase is very harmful to the motor. We can use some protection measures to protect the three-phase motor with a lack of phase. For example, a thermal relay with phase failure protection can be used for phase failure protection. If the stator winding is connected in a Y shape, we can use a two-pole or three-level thermal relay for phase failure protection. If the stator winding of the motor is connected in a triangle shape, then We can only use three-level thermal relays with phase failure protection devices, so that phase failure protection can be achieved.

       The above is compiled and released for you by yb3 three-phase motor manufacturer-Shanxi Jinxinrui Trading Co., Ltd. Shanxi Jinxinrui Trading Co., Ltd. is a motor manufacturer integrating R&D, production and sales. We look forward to win-win cooperation with you.