Phase-to-phase interference often appears on three-phase asynchronous motors, especially high-power motors. When phase-to-phase interference occurs, the high-power electric opportunity suddenly stops the operation and causes damage to the high-power motor.So how to stop high-power motors from showing phase-to-phase interference? Below, Hubei Wanbang Motor Factory sorts out the common reasons that cause high-power motors to show phase-to-phase interference.
Interphase interference can easily lead to short-circuit or breakdown of the three-phase windings of high-power motors. It can be measured with a shake meter or detected by a withstand voltage meter, which can quickly clarify whether the interference occurs due to interphase interference.
Hubei Wanbang Motor Factory reminds that in the process of processing the stator and rotor windings of three-phase asynchronous motors, the type of motor manufacturer must conduct a review of the phase-to-phase insulation of the windings.For stators or wound rotors with internal star connection, the phase-to-phase insulation check must be completed before the star points are connected.
The turn-to-turn short-circuit recovery and turn-to-turn tester review the differences, and the interphase short circuit or breakdown hinders the test with the withstand voltage tester.Turn-to-turn short circuits include short circuits between coils in each pole phase group, short circuits between coils in the same pole phase group, and short circuits between turns in the same coil.
The interphase of the high-power motor hinders the presentation of the location and its characteristics.
Inter-phase short-circuit obstacles usually occur between the winding end layers and between the upper base layer coils in the slot.The reason for the interphase short circuit is that the interphase insulation size is not suitable for the delineation, the insulation is damaged or its own defect, the interlayer pad is biased or the wire is damaged when it is embedded.
The motor manufacturer here wants to emphasize the size control of the phase-to-phase insulation of the winding ends. In order to pursue the beauty and the craftsmanship of the binding, the phase-to-phase insulation size strives to be small, but it is often these pursuits that may lead to the creepage between the phases. If the interval is insufficient, the problem will not be reflected when the motor is unloaded, and once the motor is loaded, the problem will be exposed.
When the varnish is poor and the turns fail to form a strong whole, a large amount of external dust will accumulate beside the deviation of the turns, the wires will vibrate and rub against each other under the influence of electromagnetic force, and the dust stuffed in the deviation will become "abrasive". For a long time, the wire insulation will be worn out, forming a short circuit between phases or turns.Therefore, the pros and cons of the dipping process are often the key to choosing the service life of high-power motors, and it can also play a vital role in the prevention and control of interphase insulation.
Hubei Wanbang Motor Factory has a professional motor R&D team, which provides customers with fast, accurate, multi-variety, and batch motor customization requirements. The motor power, protection grade, maintenance and other aspects can be optimized according to the customer's product utilization scenarios, and the motor can be customized It has the characteristics of strong power, high work efficiency, high dust and waterproof level, long maintenance cycle, durability and so on.
