Common fault diagnosis and treatment of single-phase asynchronous motor!
4. After the motor starts, the speed is lower than the normal value.
1) The main winding has a short circuit to the ground or to ground. The inspection method is the same as item 1 in item 3.
2) There is a coil reverse connection fault in the main winding. The sound will be abnormal and the current will be greater than the rated value.
3) The centrifugal switch is not disconnected, so that the auxiliary winding cannot be disconnected from the power supply. The current will be greater than the rated value.
4) Heavy load or bearing damage. The sound will be abnormal and the current will be greater than the rated value.
5) For series-excited motors, short-circuit between commutating segments or internal short-circuit of armature windings, or poor contact between brushes and commutators.
5. When the motor is running, it will heat up very quickly
1) The winding (including the main winding and the auxiliary winding) is short-circuited between turns or ground. The inspection method is the same as item 1 in item 3.
2) There is a short circuit fault between the main winding and the auxiliary winding (other than the end connection point). The current will be greater than the rated value.
3) After starting, the centrifugal switch is not disconnected, so that the auxiliary winding cannot be disconnected from the power supply. The current will be greater than the rated value.
4) For single-phase split-phase motors other than single-phase capacitor motors with main windings running at the main or only the main windings, except for the single-capacity motor that starts and operates with the same capacitance of the two windings, the main winding and the auxiliary winding are connected to each other incorrectly. The current will be much larger than the rated value.
5) The working capacitor is damaged or the wrong capacity is used.
6) Fixed, rotor core rubbing or bearing damage. The sound will be abnormal and the current will be greater than the rated value.
7) The load is heavy. The current will be greater than the rated value.
8) For series-excited motors, short-circuit between commutating segments or internal short-circuit of armature windings, or poor contact between brushes and commutators.
6. Motor running noise and vibration are large
The noise and vibration (especially vibration) of a single-phase motor is relatively large compared to a three-phase asynchronous motor of the same capacity or the same frame number. This is because its stator rotating magnetic field is not a regular circular shape, so the torque will not be equal at all times, that is, there will be fluctuations in size within one circumference, resulting in radial vibration of the rotor.
Common causes of loud noise and vibration are as follows:
1) Poor immersion paint, causing looseness between the core sheets, resulting in higher frequency electromagnetic noise.
2) The centrifugal switch is damaged.
3) Bearing damage or excessive axial turbulence.
4) The air gap is uneven or axially misaligned between the stator and the rotor.
5) There is foreign matter inside the motor.
6) For series-excited motors, short circuit between commutating segments or internal short circuit of armature windings, or poor contact between brush and commutator (mica between commutator segments is higher than commutator segments or commutator segments, or brush is too hard , too much pressure, etc.).
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