One, the three-phase asynchronous motor inspection test are:
Winding on the casing and the determination 12v High Torque Motor of winding insulation resistance between; The determination of winding dc resistance under the actual state of cold; No-load test; Winding on the chassis and winding insulation dielectric strength test each other; When it is necessary for winding turn-to-turn insulation dielectric strength test.
Second, the inspection method for three-phase asynchronous motor:
A) Appearance inspection, check whether the form is complete, the outlet side mark is correct, binding with bolt, bolt and nut tightening, the rotor rotation is flexible, the motor shaft and the deflection of the radial and vibration case, etc. Should also check for wound rotor motor brush, brush holder, slip ring assembly quality, and brush contact with the collector ring are in good condition. Should check the closed since the fan cooled motor exhaust system;
B) The determination of insulation resistance: Planetary Gear Motor the motor after the repair, measuring winding facies only commonly, relatively cold insulation resistance (room temperature), should also be measured for wound rotor motor rotor winding insulation resistance. And multi-speed winding motor, deal with its the winding insulation resistance are measured respectively. Large motor windings can be judged by measuring the insulation resistance whether be affected with damp be affected with damp. For motor rated voltage up to 500 v, general use 500 v megohmmeter measure, between 500 ~ 3000 v motor use 1000 v megohmmeter; More than 3000 v motor use 2500 v megohmmeter. For below 500 v motor, the insulation resistance shall be not less than 0.5 M Ω. All replacement should not be less than 5 m Ω winding;
C) Dc resistance measurement: the determination of motor winding dc resistance in cold temperatures. The error of the measured resistance between each phase and the ratio of three phase average shall not be greater than 5%. If the resistance difference is too big, the said winding short circuit, open circuit, welding or poor contact, or winding circle number is wrong, if the three-phase resistance within the prescribed scope, explain winding wire carefully;
D) Pressure test: motor stator winding facies, 24v Gear Motor lust after insulation materials insulation, can absorb a certain amount of voltage without breakdown is called pressure. Ac withstand voltage and dc voltage withstand test, is a method for the identification of power equipment insulation strength.
Pressure test: dc voltage is higher, to find some local insulation defects have special effect, and leakage current test simultaneously. Dc withstand voltage test compared with ac withstand voltage test, the test equipment, light on insulation damage small and easy to find the advantages of local defect of the equipment. Compared with the ac withstand voltage test, the main disadvantage of dc withstand voltage test is due to internal insulation under ac or dc voltage distribution is different, the test of dc withstand voltage test on insulating is closer to the actual communication.
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