The maintenance method of the variable frequency motor is basically the same as that of the ordinary motor. However, due to the particularity of the variable frequency power supply, the winding insulation of the variable frequency motor is stricter than that of the ordinary motor. Therefore, Dalan Motor recommends that you take the following measures to improve the maintenance of the inverter motor. The method is basically the same as the ordinary motor, but due to the particularity of the variable frequency power supply, the winding insulation of the variable frequency motor is stricter than that of the ordinary motor. Therefore, Dalan Motor recommends that you take the following measures to improve the insulation condition:
1. Select a magnet wire with good corona resistance to meet the requirements of high frequency pulse and partial discharge.
Polyimide imide/polyamide imide composite layer enameled wire is generally used, which is resistant to corona and corona resistance.
2. Winding and weaving construction technology.
1 The frequency conversion motor must be strictly managed in the winding, weaving, tying and other processing processes, especially in the process of winding and weaving to prevent damage to the wire. The weaving process should ensure that the slot insulation, phase insulation and interlayer insulation are placed in place.
The 2-phase insulation should be made of materials that are easily impregnated with insulating varnish. The ends of the coil should be reinforced and fixed to ensure that the ends are integrated.
3 Strengthen the insulation at the bottom of the motor slot, between the phases, between the layers and at the end of the coil, to improve the electrical strength of the motor.
3. The main insulation shall be insulated with no air gap.
1 The air gap in the insulation structure of the variable frequency motor is the main factor for generating corona.
2 In order to ensure that the overall insulation structure of the motor does not contain air gap, according to the national standard GB/TZ1707-2008 "Insulation specification for three-phase asynchronous motor for variable frequency speed regulation", the impregnating paint for the three-phase asynchronous motor for variable frequency speed regulation must be Not less than Class F solvent-free paint, and the volatile content is less than 10%, and adopts VPI process.
3 The process also improves the overall mechanical strength of the insulation structure.
4. Do a good job of matching between the inverter, cable and motor, and limit the length of the cable between the motor and the power supply.
1 Due to the mismatch of the impedance of the power line, as the cable length between the inverter and the motor increases, the amplitude of the overvoltage of the motor increases, which is likely to cause partial discharge.
2 According to the specific characteristics of the variable frequency power supply and actual needs, the length of the connecting cable should be shortened as much as possible to reduce the overvoltage amplitude and partial discharge of the motor end and prolong the life of the motor.
3 variable frequency motor "target=_blank> machine power line generally uses professional cable, also called symmetrical conductor frequency conversion cable, is 3P + 3N / E series, that is, the original 3 +1 of 1 is divided into three.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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