Regarding the repair of electric fans, where to repair the broken electric fan?

<> electric fan motor uses a 220V single-phase motor.

When the single-phase sinusoidal current passes through the stator winding, the motor will produce an alternating magnetic field, the strength and direction of this magnetic field change with time as a sinusoidal law, but it is fixed in the spatial orientation, so it is also called the alternating pulsating magnetic field. This alternating fluctuating magnetic field can be decomposed into two rotating magnetic fields that are opposite to each other at the same speed and in the direction of rotation, and when the rotor is stationary, these two rotating magnetic fields produce two torques of equal magnitude and opposite directions in the rotor, so that the resultant torque is zero, so the motor cannot rotate. When we use external force to rotate the motor in a certain direction (such as clockwise rotation), then the movement of the cutting magnetic field lines between the rotor and the rotating magnetic field in the clockwise rotation direction becomes smaller; The movement of the cutting magnetic field lines between the rotor and the rotating magnetic field in the counterclockwise direction of rotation becomes larger.

In this way, the balance is broken, the total electromagnetic torque generated by the rotor is no longer zero, and the rotor rotates in the direction of propulsion.

To make the single-phase motor can rotate automatically, we can add a starting winding in the stator, the starting winding and the main winding are 90 degrees apart in space, and the starting winding should be connected in series with a suitable capacitor, so that the current with the main winding is approximately 90 degrees different in phase, that is, the so-called split-phase principle. In this way, two currents that differ by 90 degrees in time are fed into two windings that differ by 90 degrees in space, and a (two-phase) rotating magnetic field will be generated in space, and under the action of this rotating magnetic field, the rotor can start automatically, and after starting, when the speed rises to a certain level, the starting winding is disconnected by a centrifugal switch or other automatic control device installed on the rotor, and only the main winding works normally. Therefore, the starting winding can be made to work for a short time.

But there are many times, the starting winding is not opened, we call this kind of motor single-phase motor, to change the steering of this motor, just change the terminal of the auxiliary winding.

In single-phase motors, another method of generating a rotating magnetic field is called the shaded pole method, also known as a single-phase shaded pole motor. The stator of this kind of motor is made of salient pole type, and there are two poles and four poles. Each pole has a small groove at the 1 3--1 4 total pole surface, divides the pole into two parts, and sets a short-circuit copper ring on the small part, as if covering this part of the magnetic pole, so it is called a shaded pole motor.

The single-phase winding set is set on the entire magnetic pole, and the coils of each pole are connected in series, and the polarity generated by it must be arranged in order by n, s, n, and s when connected. When the stator winding is energized, the main magnetic flux is generated in the magnetic pole, according to Lenz's law, in which the main magnetic flux through the short-circuit copper ring produces an induced current in the copper ring that lags 90 degrees in phase, and the magnetic flux generated by this current also lags behind the main magnetic flux in phase, and its role is equivalent to the starting winding of the capacitive motor, so as to generate a rotating magnetic field to make the motor rotate.

First, use a multimeter to measure the resistance value of the lower winding, make sure that there is no open circuit and short circuit, if the open circuit and short circuit are replaced. If there is a different resistance value (no open circuit) and no contact with the outside metal body (short circuit), you can remove the rotor to clean the oil stain on it, then apply lubricating oil and install it, wave the fan blade with your hand to see if there is no blocking feeling, and then turn on the power.

Summary. Common household fans are essentially axial fans, i.e., the direction of the wind is parallel to the axis of rotation of the fan blades.

The electric fan is broken to repair?

Hello Kiss, happy to answer your questions. If the fan is broken, go to the hardware store, the place where the fan is sold, and repair the home appliance <>

If the fan is broken, you can go to the hardware store on the street, and the <> that sells the fan is located

Fang, you can repair home appliances.

I want to come to my door.

First of all, look at the date of purchase, whether it has exceeded the free warranty period. During the warranty period, according to your county and city, find the after-sales maintenance point of the electric fan for free warranty.

If you exceed the warranty period and need to pay for repair, you can find Midea after-sales maintenance, or you can find a small household appliance repair shop. Electric fans, the most often damaged is the motor. If you have hands-on ability, you can also buy accessories online to replace them.

It's easy to disassemble. It's easy to assemble.

Electric fan, also known as fan and fan, is a household appliance that uses an electric motor to drive the fan blades to rotate to accelerate the circulation of air, mainly used to cool off the heat and circulate the air. It is widely used in homes, classrooms, offices, shops, hospitals and hotels.

Common household fans are essentially axial fans, i.e., the direction of the wind is parallel to the axis of rotation of the fan blades.

According to the structure of the motor, it can be divided into: single-phase capacitive type, single-phase shaded pole type, three-phase induction type, DC and AC and DC dual-purpose series commutator electric fan. According to the classification of use, it can be divided into: household electric fans and industrial exhaust fans. <>

Household electric fans: ceiling fans, table fans, floor fans, wall fans, top fans, ventilation fans, page fans, air conditioning fans (i.e. cold fans), etc.; There are also heads of head and non-head in table fans, and there are also page fans; There are shaking heads and turning pages in the floor fan.

There is also a kind of small breeze fan, which is specially hung in the mosquito net, sleeping at night in summer, as soon as it is turned on, it will be breezy immediately, you can sleep peacefully, and you will not get sick. Industrial exhaust fan: mainly used for forced air convection and ventilation.

When the electric fan is working (assuming that there is no heat transfer between the room and the outside world), the temperature in the room will not only not decrease, but will rise.

Let's analyze the reason for the temperature increase: when the electric fan is working, because there is a current through the coil of the electric fan, the wire is resistive, so it will inevitably generate heat to release heat, and the temperature will naturally rise. But why do people feel cool?

Because there is a lot of sweat on the surface of the human body, when the electric fan is working, the indoor air will flow, so it can promote the rapid evaporation of sweat, combined with "evaporation needs to absorb a lot of heat", so people will feel cool.

There are two reasons why the electric fan starts slowly: one is the aging of the capacitor, and the other is the aging of the motor.

The judgment method is to start the lowest gear, the fan slowly rotates, dial the fan blades, if the fan blades continue to operate normally, it is a capacitance problem, on the contrary, the speed of the fan blades after running for a while is a motor problem.

1. Fan blade dust and dust mites.

Due to the long-term use of the fan blade, the dust attached to the air will be deposited on it when it rotates, and there are a large number of dust mites in the process, so the rotation speed of the blade is reduced.

Solution: It can be solved by dismantling and washing, cleaning and drying the dust, and it can be restored to the original.

2. No lubricating oil.

The fan shaft part is to ensure that there is lubricating oil, otherwise the fan blade will not be dragged on the upper surface of the motive. If you are at home, you can choose to turn off the power and then flip the fan blades, if the rotation is stiff, there is basically no lubrication.

Solution: Some lubricating oil should be dripped into the shaft so that it can be lubricated, so as not to affect the motor dragging the blade.

3. The capacitance capacity becomes smaller.

After the electric fan is used for a long time, the capacitance capacity will also change and decrease, resulting in the starting torque of the motor becoming smaller, and the load cannot be driven.

Solution: The capacitor capacity becomes smaller, to replace the new capacitor, you can remove the capacitor and replace it with a new capacitor of the same model, it is recommended to choose a capacitor that is 20% larger than the original capacitor will have a better rotation effect.

Common faults of electric fans.

1. The fan shaft part should ensure that there is lubricating oil, otherwise the fan blade cannot be dragged by the motive on it. If you are at home, you can choose to turn off the power and then turn the fan blades, if the rotation is stiff, there is basically no lubricating oil.

2. Wear and tear caused by long-term use. If a fan is used for a long time, the motor will wear out, and the shaft sleeve of the motor will easily burn out after wearing.

3. The fan does not rotate due to overheating. There is a motor in the fan device, and there will be an overheating circuit breaker in the motor, if there is a short circuit in the coil winding, the heat will increase in a short time, and the motor will "strike" in this case.

4. The capacitance of the starting capacitor becomes smaller. When the fan is used for a long time, the capacitance capacity will decrease, resulting in the starting torque of the motor becoming smaller, and the load cannot be driven.

5. In many cases, the reason why the fan blades do not rotate is the problem of poor maintenance. If the blade is stiff after turning off the power, you should use some lubricating oil to drip into the shaft so that it can be lubricated so as not to affect the motor to drag the blade.

The above content refers to Encyclopedia - Electric Fan.

Introduction: If the electric fan is not working, we should first intuitively judge the fault part of the electric fan, and then repair it, which can reduce many links in the maintenance process and improve the efficiency of maintenance. Next, I will take the floor fan as an example to introduce to you how I analyze and how to repair.

Plug in the power plug of the electric fan, press the gear switch of the electric fan, hear the buzzing sound close to the motor part of the electric fan, and find that the fan blades of the electric fan move slightly but do not work, if there is this fault phenomenon, we can preliminarily judge that the fault appears in the part of the electric fan head, that is, the shaft seat of the electric fan motor is tightened, and the capacitance capacity of the motor is reduced. After the judgment is completed, the fan switch should be turned off immediately, or the power plug of the electric fan should be unplugged directly to avoid burning the fan motor.

1.Disconnect the fan power supply and remove the fan shroud and fan blades. (The screws of the fan blades are generally reversed, and they are loose when screwed to the right).

2.The fan cover and fan blades can also be washed and drained during the machine.

3.Twist the fan bearing rod by hand, if it can be easily rotated, it means that the capacitor should be replaced (the capacitor should be changed according to the original capacitor) If it can not be rotated, or it feels very tight when it is difficult to rotate, you should remove the motor and start to overhaul the motor bearing seat, clean up the impurities and stolen goods of the bearing seat, and add a little sewing oil to lubricate it, and the general fault will be discharged.

4.After adding sewing oil and changing the capacitor, the fan motor can be operated normally when the machine is turned on, and then the fan blades are installed, and the fan cover can enjoy the cool breeze in the hot summer.

5.In addition, the fan shaking head function does not work, you can buy the same type and specification of the moving head gear combination box to return to normal.

If the fan bearing seat is too dirty, it can be cleaned with gasoline and then lubricated with sewing oil. Sewing oil can also be replaced with engine oil, butter.

Introduction: The weather is starting to get hotter, our electric fans are going to start "going to work", what to do if the electric fan strikes and does not turn, as long as you follow the following steps, you can find out the problem and determine whether there is value in repair.

1. First of all, when not plugged in, use a screwdriver to pull the fan fan to see if the rotation is flexible.

If it is very laborious to rotate or not as flexible as the normal use (excluding the wind page involved in foreign objects), it means that the problem lies in the fan motor, in this case, the motor is generally replaced to completely solve the problem, for dozens of yuan of electric fans to change a motor can almost buy a new one'The electric fan is gone, so there is no value for maintenance, but for electric fans above 100 yuan, you can also consider repairing.

2. If the electric fan does not rotate

If the fan does not turn, in the case of unplugging, it is better to disassemble the machine and check it first.

Start by removing all the screws with a Phillips screwdriver.

Remove the back case, test your eyesight, and see what's going on with this fan? No, whose gold necklace is running in the fan!

Found a problem? Then remove the foreign object first, and then say that it is ruined, and carefully unscrew the wind screws.

Remove the wind blade after the screws are loosened.

What to see? Good guy, it's such a long chain, I can't believe it, this thing can run inside the fan, remove it.

After removing it, you can turn on the power first to see if it can rotate, and if it can be rotated, it means that this electric fan cannot be rotated because the foreign body necklace is tied to the wind page.

3. It still can't rotate after removing the power

If it still doesn't turn after removing the power, it means that further damage has been caused. Then carefully check the various switches and wiring.

Did you find anything? It turns out that this anti-reverse switch is broken, normally this metal cylinder should be in the switch like the picture on the right, probably because the fan suddenly cannot rotate due to inertia when the necklace falls in, causing the fan to fall from a high place, causing the switch to break the protective shell. See the red box in the figure.

Then change to a new one, if you don't have it, you can also use it, just connect this wire together, and wrap it with electrical tape.

If the switch is intact, you can check the motor, rotate the fan blades, and if you feel that the resistance is high, you can disassemble the motor and apply some engine oil (cooking oil is also acceptable).

If the motor and switch are in good condition and the fan rotates slowly, you can use a multimeter to check the capacitance (generally the speed will decrease after the capacitor has a problem).

Adjust the multimeter to the buzzer level, the multimeter pen is connected to the capacitor, and the continuous sound indicates a short circuit; Ringing (when on) is normal; If it does not sound, it means that the circuit is broken. If there is a problem with the capacitor, you can buy one directly (market price 3 5 yuan).

After connecting, finally check the lower circuit, and then power on the test machine, OK, the problem is solved, and the wind page and back shell are installed in reverse order.

Tighten the screws. Power on and see if it's spinning fast. Saved a new fan, hahahahaha.

4. Self-study repair recommendation

It's not difficult to fix a fan, but it's always easier for engineering students to actually operate than to express. I recommend those who are willing to learn to repair to buy this book, it is better to ask for others than for yourself.