In home appliances, such as electric fan, refrigerator, washing machine, smoke lampblack machine, vacuum cleaner, its work force are used for single-phase AC motor. The motor has the advantages of simple structure, so some common faults in the amateur conditions for repair. The 1 motor is energized after starting the fault in addition to the power circuit, the motor winding side, mostly the motor starting circuit abnormalities. Fan, fan motor, washing machine generally adopts capacitor start running; and refrigerators, refrigerator and other motor uses the resistor split-phase starting operation, once the starting circuit of capacitor split-phase motor or resistor is damaged, it can not be the normal operation, maintenance should be ruled out first starting circuit fault check motor fault. If the starting circuit is normal, may be internal motor winding local short circuit or open circuit, available multimeter R x 1 retaining measure each winding resistance values. Such as the refrigerator compressor motor, normally starting winding resistance of about 23 ohms, running winding resistance is 10 ohms, start-up and operation of cascaded winding resistance should be for both normal and. 2 motor speed slow and weak motor in power after the speed is slow and weak, for a capacitor start motor is mostly capacitor capacity is insufficient, leakage is serious or low voltage; in addition the squirrel-cage rotor aluminium strip part if there are serious defect and fault conditions, especially the washing machine motor often start and positive alternate operation, rotor bar of large induction current is easy to make the rotor bar breaking, also leads to run slow and feeble. When the aluminum cracks, available in the crack drill to drill a small hole, with the corresponding aluminum wire is embedded into the hole, and then the riveting die out, finally the files and sanded smooth. If the aluminum of the fracture surface is larger, conditional can adopt aluminum wire welding method to repair. 3 motor shell charged General requirements of the electrical leakage current shall be not more than 0.8mA, in order to ensure the safety of the people. Motor casing leakage is the main reason for the motor in a lead-out wire insulation damage and touch the shell; the motor windings partial burning caused by stator and the casing leakage. More common is a long time high humidity environment, causes the motor insulation reduction and the shell charged damp. At this time, can shake table measuring the windings and the casing insulation resistance value, if the 2M ohm, the motor has been affected with damp is serious, should be the motor stator winding for baking to wet processing. The 4 running motor temperature rise intensified in various types of household single-phase motor under normal working condition, the motor casing surface temperature is generally higher than ambient temperature around 20 degrees, the highest temperature rises shall not be higher than 70 DEG c.. If the motor work for a few minutes after casing surface temperature drama rise, and the machine are circulated within the tar taste even smoke, for motor overheat fault. Motor overheat temperature rise the reason, basically have the motor itself quality problems; the motor is overloaded ( transmission mechanism caused by fault of motor load); the heat dissipation conditions of the motor; the motor windings partial short circuit. One of the more common is the winding inter-turn short circuit, detachable boot shell checking winding. If the line package without burning phenomenon, the stator to dipping insulation treatment, and then drying. If the line with local burned, the only change winding line. The 5 running noise of motor motor working noise, generally there are two reasons, one is the mechanical noise, mainly motor bearing wear and short of oil, produce hard friction noise. This can be cleaned after adding grease to reduce noise. When the rotor shaft and bearing looseness or loosening of the end cap, also can make the motor rotates in axial float noise. There are also some assembly the poor quality of the motor, the bearing chamber is concentric, motor radial clearance are not even so will generate abnormal noise. In this regard, as long as the remove outer cover and rear cover, a rotor and a stator seat removed, to knock the riveting inner cover shaft can emergency repair center. In addition, a number of shaded pole motor short circuit loop loose or core loose to generate electromagnetic noise, clamping measures should be taken. ]