Fan Motors for Refrigerations and Air Conditioner

Fan Motors for Refrigerations and Air Conditioner;  The fan motor consists of an electric motor with one end of the shaft protruding outward. On the shaft can be added fan blades. The point is to create air circulation in the refrigerator or to push air through the condenser.

There are two types of fan motors for refrigerators, namely the fan motor for the evaporator and the fan motor for the condenser.

1.    Fan motor for evaporator

Placed in the refrigerator on the back near the evaporator. The point is to circulate air through the evaporator, cold air then flows evenly to all parts of the freezer and refrigerator. Fan motors are only used in refrigerators that use defrost automatically, such as: no-frost, frost-proof, frost-free and so on.

The motors used are generally shaded pole motors, 110 and 220 volts, 50/60 Hz, 2500/3000 ppm rotation, 6-12 watts, 0.2-0.7 amperes. The motor shaft for the fan blade is 1/8 or 3/16 inch in diameter. Rotor rotation is either clockwise (CW) or counterclockwise (CCW). The direction of rotation of the shaded pole motor is actually easy to know by looking at the location of the barrier winding. When viewed from above, the barrier winding is on the left, the rotor will rotate from left to right.

Fan blades are generally made of plastic or aluminum. There are two kinds of shape: the fan leaf (propeller) and the blower wheel (blower wheel). Fan blades have a diameter of 4-5 inches. The number of leaves 4 or 5 pieces with a slope of 30 degrees. Blower wheels must use a special housing. The direction of air flowing in parallel to the shaft, then by the blower wheel the direction of air flow is changed perpendicular to the shaft while being pressured.

Damage to the fan motor is generally caused by broken cable connections, damaged fan switches, bent motor shafts, jams and so on. Damage to the evaporator fan on the refrigerator unit can result in insufficient cooling. The freezer can't freeze water. Air in the evaporator can not flow so that ice block occurs on the evaporator.

In the split AC unit, if the blower does not rotate, there will be frost up to the 3-way service valve. This can endanger the compressor because the refrigerant that enters the compressor is still a liquid. The new split AC unit is equipped with a rotation sensor on the blower, so if the blower does not rotate, the system will be completely turned off.

2.    Fan motor for condenser

Placed on the outside under the refrigerator. The motor is bigger and more powerful. The point is to suck or push air through the condenser and compressor. To get an efficient air flow, the condenser must be given a housing or cover (shroud), so that air does not flow from the side of the condenser.

Installation of the fan motor must be horizontal. The fan motor gets electric current directly from the current source or from the thermostat. If the overload opens the contacts due to overheating, the compressor will stop, but the fan motor can continue to cool the compressor.

The fan motor itself uses an internal overload protector, which is placed inside the coil of the electric motor. If the fan motor can't work, because it's too hot. We have to wait until the fan motor cools down so that the contacts on the internal overload can be connected again. After that, the fan motor can be tried again. There is a fan motor that can work continuously without lubricating oil. There is also a need to be given oil (SAE 10 or 20) one hatchling every six months.

Fan motors generally have four poles, 110 and 220 volts, 50/60 Hz, 4 – 6 watts, 1/300 – 1/50 DK, 1450 ppm. The shaft diameter for the fan blade is inch and threaded. Fan blades are made of aluminum or plastic with a diameter of 6 – 10 inches. The number of fan leaves 2-5 pieces. The fan blades must be balanced. Turning time should not make a sound.

The use of condenser fans depends on the type of condenser used. Damage to the condenser fan can cause:

Ø  Condensation temperature is not reached.

Ø  The condenser temperature is too high, so the condenser pressure is also high.

Ø  Compressor will work harder.

 

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