How to repair the fan motor is very slow

It is estimated that the motor bearing is seriously worn or the lubricating oil is dry.

There are many reasons why the motor is not working or spins slowly. First, turn the motor shaft or fan blade by hand to see if the rotation is flexible. If there is resistance to rotation, it means that the motor bearing is seriously worn or the lubricating oil is dry.

You should replace the bearing with a new one or add lubricating oil to make it rotate flexibly and without resistance. When fixing the motor, be sure to tighten the screws diagonally and step by step. At the same time with a screwdriver with a wooden handle.

Tap the shaft back and forth to ensure that the shaft is concentric with the bearings at both ends, and the rotation is flexible and without resistance after tightening.

If the rotation is flexible and there is no resistance, there are also the following reasons:

First, the capacitor performance is poor or the capacitance is seriously reduced, and a new capacitor with the same capacity should be replaced.

The second is that the coil has an inter-turn short circuit fault, and a multimeter can be used.

Measure the resistance values of the running and starting windings to determine whether they are good or bad. If the resistance value is abnormal, you need to replace the motor with a new one.

Repair method for slowing down the speed of electric fan motorCheck whether the power supply voltage is about 220V, check the starting capacitor, check the motor, and check the thyristor drive circuit.

The causes of slow speed failures include low power supply voltage, damage to the starting capacitor, poor performance of the motor itself, or poor bearing lubrication. For the fault phenomenon of slow speed of microcomputer-controlled electric fan, it may be caused by the poor performance of the bidirectional thyristor drive circuit. The inspection methods for floor-standing electric fans, desktop electric fans and Hongyun fans are roughly the same, so I will not list them all here.

Here we take the floor-standing electric fan as an example to explain the troubleshooting of the slow speed of the fan blade.

1. Check whether the power supply voltage is about 220V.

Power on to check whether the AC 220V voltage entering the electric fan is normal. As shown in the figure below, if the power supply voltage is much lower than 220V, the speed of the motor will be very slow or even not rotating, and the electric fan will need to wait for the grid voltage to stabilize before it can run normally.

2. Check the starting capacitor.

Damage to the starter capacitor will affect the normal operation of the motor. Solder the capacitor at one end and short it to discharge, and then use the multimeter RXLOK to measure its charge-discharge performance. Under normal circumstances, the hands of the multimeter should have a large swing and return to the infinity position.

If it is not easy to determine the fault of the change in capacity, this measurement method is usually used to eliminate the fault.

3. Check the motor.

Measure whether the stator winding of the motor is partially short-circuited, if the measured value is lower than the normal value, it means that the internal coil of the motor is partially short-circuited, and the motor needs to be replaced to eliminate the fault. In addition, the internal bearings of the motor should also be checked for lack of oil, deformation and damage. Adjustments, repairs or replacements are made for bearing failures, and oil lubrication can be added to eliminate faults if there is a shortage of oil.

4. Check the thyristor drive circuit.

For microcomputer-controlled electric fans, poor performance of the bidirectional thyristors will also lead to slow rotation. At this time, the performance of the bidirectional thyristor can be measured with a multimeter or the fault can be directly eliminated by the replacement method.

If it turns normally, after turning it off for a while, turn on the switch again and suddenly it turns a lot fuller, and the case heats up.

The first cause of the failure is that the bearing (or shaft sleeve) of the motor is short of oil, and the shaft sleeve is properly oiled, and it is easy to turn it by hand.

Fault 2: The capacitor capacity has dropped sharply and is close to failure, so it is enough to replace a capacitor with the original capacity (or close to the original capacity).

The electric fan rotates very slowly, which is caused by a decrease in the capacity of the starting capacitor of the motor.

1. The starting capacitor provides a 90-degree lead angle to the coil of the motor, so that the motor can be started.

2. If the capacitor is damaged or the capacity is reduced, the motor will not start or it will be difficult to start.

3. In this way, the motor will heat up, and it will burn out after a long time, so you can replace a capacitor of the same type first.

4. If that's still the case, you have to disassemble the motor to see if the internal coil has a lighter connection.

Related Notes:

In order to cool down as soon as possible, some people turn on the electric fan to the fastest, thinking that the wind is too enjoyable to relieve the fever. This is inappropriate practice. When the air temperature exceeds 30, the air temperature is close to the normal body temperature of the person, and the wind blowing from the electric fan is also a high-temperature wind.

If the fan blows too much, the surface temperature drops, the pores are blocked, the sweat inside the body cannot be released, and it will feel hot, and at the same time, fatigue and weakness, back pain will occur, which is "sweating". Therefore, it is not advisable to use an electric fan for high-speed and high-speed blowing, but should be adjusted to medium or low speed to blow a gentle breeze as well.

Here's how to fix it:

The speed of the electric fan is slow, at this time it is necessary to check the electric fan, first to check the external cause of the air conditioner, and then deal with it, if you find that the speed of the electric fan is very slow, then you need to turn off the power supply, and then on the fan blade rotation shaft. Add some lubricating oil and you can get the fan up again.

The speed of the electric fan is slow, at this time you can disassemble the electric fan, especially the soft rubber head on the shelf should be removed, the fixed part of the fan should be removed, the back cover also needs to be removed, and the screws on it should be removed, and then we wipe the fan blades clean with a rag, add lubricating oil to the bearing, and then install the electric fan back, at this time the situation of slow speed of the electric fan will be solved.

The slow speed of the electric fan may also be an internal problem, you may need to replace the bushing, and you may also need to replace the capacitor inside, if it is because the wire is damaged, then to replace the wire in time, these problems need to be repaired by professionals.

The reason why the electric fan is slow and weak

After the internal resistance of the electric fan becomes larger, it will cause the fan blade to rotate and use it normally, and the overheating of the fan will cause the motor load capacity to deteriorate, at this time, the electric fan will have the problem of slow speed and weak start, and there is also a situation that the power supply is not plugged in well, and the problem of slow start of the electric fan will also occur.

The method of repairing the fan motor is very slow is as follows:

1. Check whether the motor lubricating oil of the fan is not enough, if it is because of this reason, the resistance will become greater when the fan rotates, and the rotation speed will become slower.

2. If the lubricating oil of the fan motor is sufficient, it is necessary to check the small accessories in the fan to see if the accessories are damaged, such as capacitors.

3. If the above two methods cannot make the fan rotate faster, you must find a professional to repair it or take it to the electrical repair shop for maintenance.

4. During daily use, pay attention not to use it for more than 24 hours each time, so as not to overwork the fan, and turn it off in a timely manner.

The time of the invention of the fan

A fan is a device used to generate wind and cool down on a hot day. An electric fan is a device that generates airflow by using an electric drive, and the fan configured in it rotates to form a natural wind after being energized to achieve the effect of cooling.

In 1829, an American named James Byron was inspired by the structure of a clock and invented a mechanical fan that could be fixed to the ceiling and driven by a clockwork. The cool breeze from the fan blades is pleasant, but it is a hassle to climb a ladder to get wind.

In 1872, a Frenchman named Joseph developed a mechanical fan that was started by a clockwork turbine and driven by a gear chain device, which was much more refined and convenient to use than the mechanical fan invented by Byron.

In 1880, the American Schuler for the first time installed the blades directly on the electric motor, and then connected to the power supply, the blades rotated rapidly, and a cool breeze came to the face, which was the world's first electric fan.

The main component of the electric fan is: AC motor. Here's how it works:

The energized coil rotates by force in a magnetic field. The form of energy conversion is: electrical energy is mainly converted into mechanical energy, and at the same time, because the coil has resistance, it is inevitable that some electrical energy will be converted into thermal energy.

The fan motor rotates very slowly, and the transformer can be replaced.

1. The fan blade is old, and the internal resistance of the motor becomes larger, resulting in the fan blade being unable to rotate normally.

2. The overheating of the fan causes the load capacity of the motor to deteriorate, resulting in the inability to rotate.

3. Problems such as overheating and short circuit of the protection device inside the motor.

4. There is also a possibility that the external power supply is not plugged in properly, or the switch is broken.

This circuit can be divided into three parts, the leftmost 220V AC circuit, the middle swing circuit, and the rightmost fan circuit. The electric fan motor is a single-phase AC motor, and it has two windings inside, one is called the running winding (also known as the main winding), and the other becomes the starting winding (also known as the secondary winding).

The starting circuit is composed of phase splitting, so that the main and auxiliary windings are separated by 90 ° electrical angles in space, and the speed regulating circuit is composed of a reactor speed regulating switch in series, and the voltage of the motor is changed to achieve speed regulation by adjusting the reactance size.

Precautions

Electric fan motor generally refers to the motor fan, Xiangsui motor fan is a kind of motor with a fan hub and blades, along the outer circumference of the fan hub and there is a uniform distribution of grooves, the blades are inserted in the slot, through welding, bonding and other permanent connection methods to make the blades and fan hub become one.

The overall balance of the motor fan is good, can save the man-hours required to adjust the balance, and the weight is reduced by 30% than the bolt connection cavity stool type fan to be careful about the round cloth, and the vibration and noise of the motor running of the utility model are all reduced.

The starting performance is an important quality indicator of the motor fan, during the inspection, in the slow gear, when the rated voltage of the power supply is 85%, the motor fan should be able to start from a standstill, and run normally, the shorter the time required for a motor fan from start to normal operation, the better the starting performance of the motor fan.

1. Understand how it works.

Only by understanding the working principle of the electric fan clearly can the next plan and measures be taken. When the electric fan is working, the energized coil rotates under the force of the magnetic field. The electrical energy is converted into mechanical energy, turning the fan blades, and at the same time, due to the resistance of the coil, some heat energy will be generated, so the surface of the general electric fan will be hot if it is used for too long.

Its principle is relatively simple, and many people must have known it before.

2. Find the cause of the failure.

When it is found that the fan rotates slowly, only if you know that the problem is first, can you deal with it in a targeted manner. First of all, you need to count whether it is due to external reasons, such as the power supply is not plugged in, the switch is not fully turned on in place, etc., if it is not because of these reasons, it is an internal reason. If the fan is overheated for too long and the load capacity of the motor becomes poor, the fan will rotate slowly. Another reason is that the protection device inside the motor is overheated and there is a short circuit; In addition, the axial clearance of the shaft of the electric fan is too large, which can also cause such problems.

Third, maintenance methods.

When the problem is found, it is time to carry out repairs, and the specific measures are as follows: if the power is turned off because the fan blades do not rotate, add some lubricating oil to the shaft where the fan blades rotate to reduce resistance and make the rotation more flexible. If it involves the aging and damage of internal parts, then it should be replaced, which involves some professional problems, non-professional personnel should not do it themselves, and should let technicians check and replace.

As the weather gradually gets hotter, electric fans have become a comfort index for many people, however, Lu Meng's electric fan speed slows down, which affects our experience. There are generally two situations when the speed of an electric fan slows down, one is that the motor is damaged, and the other is that the power cord is aging. If the motor is damaged, the motor needs to be replaced, but if the power cord is aging, we can repair it by the following methods.

First, we need to replace the power cord. Generally, the power cord of the electric fan is connected to the fan and the power supply, if the beam Wugen wire becomes old, it will cause the voltage to be unstable, so that the motor cannot work normally. We can use a wire cutter to cut off the damaged wires and re-solder the new wires.

Secondly, we can disassemble the electric fan and clean the motor. During the use of electric fans, a large amount of dust, hair, and hair will enter the motor, resulting in poor motor rotation. We can use a vacuum cleaner or brush to clean the fan, especially the inside of the bearing and the driving blade, which can effectively extend the life of the electric fan.

Finally, you need to pay attention to replacing the filter behind the electric fan in time. If you don't pay attention to cleaning the filter, too much dust will often accumulate, causing the filter to clog and affect the work of the electric fan. Therefore, replacing the filter screen in time is also an important measure to keep the electric fan running at high speed.

In short, it is very necessary to maintain the electric fan, especially for users who use the electric fan all year round, and it needs to be cleaned and maintained regularly. Only in this way can we maintain the long service life of our electric fans and keep us away from the sweltering summer months.