Samsung washing machine motor repair

It is not always possible to repair the engine of a Samsung washing machine on your own. Even an inexperienced craftsman can cope with replacing worn out electric brushes, but grinding down lamellas or adjusting the winding are more complex and sometimes risky tasks. The first thing to do if the motor malfunctions is to carry out diagnostics and determine the causes of the problem. Let's look at how to do it right.

Comprehensive engine check

Many models of Samsung washing machines are equipped with commutator-type electric motors. They rotate the drum through a belt drive. Such motors have an important advantage: equipment owners, if desired, can test them at home, on their own. The only condition is to follow safety rules and know the electrical circuit diagram of the engine.

In commutator electric motors, the connection is made according to a certain scheme. The supplied current is supplied to the triac, then sequentially to the contacts of the reverse relay, the stator winding, and the rotor. When switching operating modes or changing power, the signal is transmitted from the control board through the contact groups of the command device and the transformer. The acceleration speed of the engine is controlled by a tachogenerator. It is located on the body. And to smooth out the friction force, electric brushes are provided.

Due to the fact that there are two sections in the stator winding, the likelihood of interference due to sparks on the commutator is reduced. Changing the direction of rotation of the drum occurs due to a change in polarity on the wire. When switching to spin mode, a retraction is provided.Electricity is connected to the extreme terminal and directly to the outlet. If it is lowered, the washing machine runs on the standard program, with smooth and slow shaft movements.

To diagnose a commutator motor with your own hands, you need to supply electricity directly. The discharge occurs sequentially when connected first to the stator winding, then to the rotor. If the engine is working properly, it begins to hum and work. If a short circuit occurs, the circuit becomes noticeably hot.

Another way to test the motor is to connect the stator and rotor windings as described above, and then use an autotransformer with a power exceeding 500 watts as a power source. The technician calls this option safer, since it makes it possible to clearly monitor engine acceleration and react quickly if an unforeseen situation arises.

Important! When performing diagnostics using this method, to be on the safe side, you must include a 10 or 5 Ampere fuse in the circuit.

If it is not possible to use a transformer, you can use an electronic regulator. It makes it easier to control the load and prevent the engine from overheating. Sometimes specialists make such devices themselves. Their diagrams are easy to find on the Internet.

Beginners can visually assess the performance and serviceability of the engine. To do this, you need to start it and see how the commutator brushes spark. If a large number of sparks appear, then a breakdown has occurred. Further actions that should be taken are disassembling the motor and extensive testing.

Is it possible to restore the slats?

Electric motor malfunctions are often caused by loss of contact with the rotor winding section.It occurs when the engine lamellas or the wire located next to them are damaged. Lamels are metal plates connected to the commutator shaft and transmitting current through the circuit. If the lamellas are faulty, the current stops flowing to the rotor or its strength is much higher than the rated level. As a result, there is a risk of short circuit or overheating.

When connecting the lamellas to the winding sections, hooks are created to make the contact more reliable. But during operation of the electric motor, the wires can get caught on protruding parts and break. In this case, the repair consists of restoring the integrity of the part.

It is unsafe to turn on a washing machine in which the lamellas have peeled off, as there is a risk of a short circuit.

Delaminated lamellas are a consequence of overheating that occurs when the rotor jams or shorts. A current flows through the metal plates, the strength of which is higher than the operating level. As a result, the thin metal overheats and peels off. Among the most common reasons for the separation of lamellas, experts name the following:

• damage to the bearings that “lock” the motor;
• in machines with vertical loading - unfixed drum flaps after starting the wash and a sudden stop of work.

Peeled lamellas often indicate that related problems have arisen, or that the washing machine is not being used properly. The removal of metal plates always has its prerequisites. It is important not only to repair the engine, but also to check whether the equipment is being operated correctly.

In case of insignificant detachment of the lamellas, with a gap of no more than 0.5 mm, grooving the shaft helps to correct the situation. It is performed on a special machine.The master finds all the peelings, cleans them and once again carefully inspects the part, removing burrs or dust particles.

A simple test can help detect lamella separation. You can do it yourself. You need to slowly turn the engine and check if there is a crackling noise. Its appearance indicates that the lamellas are rubbing against the winding.

Winding problems

Overclocking problems are sometimes caused by a faulty winding. The engine may not start at all, or the drum may rotate too weakly. When short circuits occur in the wire turns, overheating occurs, the thermistor is triggered and an emergency shutdown of the power supply occurs. When the washing machine is started again, this process is repeated. This happens until the temperature sensor burns out and the electric motor itself fails.

To diagnose a winding fault, you need to use a multimeter. You must proceed as follows:

• turn on the device, set the “Ohmmeter” mode;
• connect the probes to adjacent lamellas;
• The multimeter should show the resistance value. Normally, it should vary between 0.1–0.4 ohms.

If the winding is damaged, it can be repaired. But repairs in most cases are not economically profitable. It is easier and cheaper to replace the entire part.

It's all about the brushes

If the cause of the motor malfunction lies in worn out electric brushes, it is easy to deal with the problem. It is enough to remove the damaged parts and install new ones. To do this, you need to buy similar electric brushes. When choosing, you need to focus on the serial number of the machine or engine. To avoid mistakes, you can take old spare parts and bring them to the store. Sellers will help you choose the right ones based on the serial number.Electric brushes can be with corner or central contacts, with or without a housing.

You shouldn’t buy parts at random, because even Samsung car models are equipped with various spare parts.

To replace the brushes, you need to remove the motor. You should proceed according to the following algorithm:

• unscrew the bolts holding the back panel of the washing machine body;
• find an electric motor. It is located below the drum;
• remove the belt. To do this, you need to pull it towards you and at the same time rotate the pulley;
• release the wiring from the contacts;
• loosen the bolts that hold the engine;
• remove it from its seat. You must act carefully, swing the engine body from one side to the other.

Masters advise beginners to film the process of removing the part on video or take photos so as not to make a mistake when they need to install the engine in place.

The removed motor must be placed on a flat surface. It should be dry. Then you can start replacing the electric brushes. They are attached to the sides of the case. To remove the spare parts, you need to disconnect the wire suitable for the case, move the contact down and stretch the spring. After this, the brushes can be removed one by one.

Its case should be opened and the carbon tip located inside should be measured. If its length is less than 0.7 mm, the brush needs to be replaced. A new carbon rod is installed in the socket. Then you need to compress the spring, fix the part in the seat, move the contact up and connect the wiring.

If during the repair it turns out that only one electric brush is worn out, it is necessary to replace both carbon rods; they are always installed in pairs. After replacing the brushes, you can install the motor and assemble the washing machine.The work is done like this:

• the engine is placed in a “socket” and secured with bolts;
• wiring is connected;
• put on the drive belt;
• close the case with the back panel by screwing in the retaining bolts.

The repair work is completed by checking the new brushes. To do this, turn on the quick wash program. If the engine starts and the drum rotates without interference, then the equipment is working properly.

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