Measurement of three-phase DC resistance: Motors below 1.30KW can be directly measured with a multimeter; For motors with a power output of 2.30KW or above, use a double arm bridge to measure the resistance values of U1U2, V1V2, and W1W2. When measuring, the connecting piece should be removed in advance and a multimeter should be used to separate the groups before measuring and recording the data; 3. The error of three-phase DC resistance shall not exceed 2%; Vibration value measurement: During the no-load test of the motor, use a vibration meter to measure the axial and radial vibration values and displacement values on the load side and non load side of the motor. The standards are as follows: rated speed 3000, 1500, 1000, and 750; Vibration value 0.05 0.085 0.10 0.12 Temperature rise measurement: Use a thermometer to measure the temperature rise of the motor coil and front and rear bearings, and the allowable temperature rise is generally 35 degrees Celsius; Measurement of bearing clearance when the bearing is less than 45K and the coil is less than 65K: 1. Insert the fuse into the bearing clip, roll it over a steel ball, and use a spiral micrometer to measure the thickness of the center part of the fuse indentation. The average of the three measurements is the bearing clearance value. Generally, it is normal to measure a wear clearance of no more than 0.2MM; 2. Read correctly and record relevant data; Maintenance and disassembly steps for low-voltage AC asynchronous motors: The low-voltage AC asynchronous motor consists of two parts: the stator and rotor, and the stator consists of three parts: the iron core, winding, and frame. The rotor is mainly composed of three parts: iron core, winding, and shaft. The principle of asynchronous motor rotation: Electromagnetism - the three-phase symmetrical winding of the stator is fed with three-phase symmetrical current to generate a rotating magnetic field; Electromagnetic electricity generation - rotor winding cutting rotating magnetic field induced electromotive force (current); Electromagnetic force (moment) - The current carrying conductor of the rotor generates electromagnetic force and forms electromagnetic torque under the action of a rotating magnetic field, causing the rotor to rotate
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