Single phase motor starting mode and maintenance
Starting method
Starting method of 220V AC single phase motor roughly divided into the following types:
First, the motor when static centrifugal switch is connected to the electric starting capacitor participation, after starting work, when the rotor speed reaches the ratedvalue of 70% to 80% when the centrifugal switch will automatically trip, starting capacitor to complete the task, and is disconnected. The starting winding is notinvolved in the operation, and the motor to run the winding coil to action.
Second, a capacitor connected in series to participate in operation and operationwork starting winding. A motor centrifugal switch, if the motor can not start successfullyin a very short period of time, so the windings will soon be destroyed.
Third, split phase starting type, by the auxiliary winding to auxiliary starting, the starting torque is not big. Operation rate remained approximately constant value.Mainly used in electric fans, air-conditioning fan motor, washing machine motor.
Positive inversion control:
Connection with reversing switch, usually starting winding resistance and operation ofthis kind of motor winding is the same value, that is to say the motor starting winding and winding wire diameter operation is fully consistent with the coil number. Get this kind of motor with the general washing machine. This positive inversion controlmethod is simple, without complicated switch conversion.
Positive inversion control, just put the 1-2 line or 3-4 line on the switch can complete reversal.
The starting and operating winding judgment, usually starting winding is much bigger than the DC operation coil resistance, using a multimeter can measure. The general running winding DC resistance to a few ohms, and the starting winding DC resistancefor more than ten ohms to a few tens of ohms. The capacitance value: two value capacitor motor starting capacitor capacity, large capacity, small running capacitor,voltage is larger than 400V.
Maintenance method
Professional electrical maintenance center maintenance: cleaning process of motorrotor - replace the carbon brush or other parts of vacuum pressure impregnation F level - drying - balancing school.
1, the replacement of winding must take note of the primary winding form, size andnumber of turns, wire, when the loss of the data, should be available to manufacture factory, arbitrarily change the original design the motor winding, often one or severalperformance deterioration, and even can not be used.
2, removing the motor, from the shaft extension end or extension end of rotor can be taken out. If it is not necessary to remove the fan, or from a shaft extension end out rotor is more convenient, from out of the rotor in the stator, stator winding insulation should prevent damage or.
3, when the end of the life of the bearing, motor running vibration and noise willincrease obviously, check the radial clearance of the bearings to the following values,i.e.replace bearings.
4, should ensure good lubricating motor during operation. General motors runningabout 5000 hours, should complement or replace grease, bearing overheating or lubrication modification found in operation, the hydraulic timely for lubricating grease.Replacing the grease, should remove old lubricating oil, and oil tank of gasolinecleaning bearings and bearing cover, and then the ZL-3 lithium grease filling a cavity between the inner and outer rings of bearing 1/2 (2 pole) and 2/3 (4, 6 and 8 poles).
5, when the motor thermal protection continuously happen action, should find faultfrom motor or overload or protection device setting value is too low, eliminate malfunction, can be put into operation.
6, the use of the environment should be kept dry, motor surface should be kept clean,air inlet to dust, fiber and other obstacles.
