1. Fan Motor with a larger capacity than the provisions of the motor will increase the working current, it is easy due to overheating the motor. If the capacity does not exceed the original capacity of 15% or can be used.
2. Fan capacitor for a small change: 2.5UF now changed to 1.2UF, you can use, the error is only the torque becomes smaller, lower speed. The replacement of small capacitors can also start the fan, that is, people often say that the small horses carts, the impact on the life of the capacitor, the impact of the motor is 30 seconds to start up the fan because you have replaced a small capacitor may need 1 Minutes to start up, you can imagine the motor will be hot. Life will be shortened. Capacitance is used to start the motor, the speed of the speed is driven by the governor of the current size. I am talking about the heat because you replace the small capacitor caused by the fan motor starting time to produce the heat.
Because the fan is mostly single-phase, and direct use of single-phase power can not produce a sufficient start magnetic field, can not maintain good operation
So this motor generally have two windings, is the main winding and auxiliary winding, the main winding directly into the circuit, auxiliary winding through the capacitor after the string into the circuit. So that the auxiliary winding has an angle difference and the capacitor is the role of phase shift,Fan Motor so that the phase of a deviation, which is equivalent to get 2-phase power, and the phase is different, you can start the rotor, and then the main winding to maintain the magnetic field He ran, auxiliary winding to continue to promote,Fan Motor so that it does not stop because of external forces. To ensure the operation of the good
The size of the start capacitor is only the size of the starting speed of the fan can be changed. Do not believe you can search for the role of the capacitor. Once the fan is activated,Fan Motor that is, the capacitor once the discharge is completed only after the capacitor to cut off the role of DC. Will not be involved in the operation of the fan. Because the capacitor only charge and discharge function.
If you want to determine the fan capacitor failure, you can teach you a simple method. Turn on the fan switch If the fan does not turn, turn the fan clockwise by hand If you can start it successfully, prove that the starting capacitor has been broken down.
Produce that you said this phenomenon is nothing more than two aspects of the possibility is relatively large, one bearing the lack of oil, due to the lack of lubrication of the motor bearings, it increases the running resistance, it can only turn in the high speed, and the speed may The solution to solve this problem is to open the motor fan part of the cover, the motor shaft at both ends of the cover through the axis of the bearing hole into the high-quality oil until the foot, outward oil so far, so re-installed Cover, restore the original, and then power test machine. There is also a situation, it is the Fan Motor motor is the kind of starting capacitor, it is possible to reduce the capacity of the capacitor caused by the operation of the weak; if this is the case, as long as the nominal value of the capacitor to buy a ( That is, by the original to buy), according to the original wiring after the replacement should be normal. Under normal circumstances, after the first refueling treatment measures still can not work properly, and then the second way to replace the capacitor, if you still can not resume normal work, it must be the motor winding (coil) Out of the fault, and do not replace the motor, then you must rewrite the motor coil can be restored to normal work.