How To Rewind An Electrical Motor

With modern technology containing many different types of electrical elements many products need a way to convert electrical energy in mechanical energy and this is where electric motors come in. Electric motors convert energy from either (A/C) or (D/C) current. Many electrical products we use on a daily basis will incorporate some kind of motor in them including ceiling fans, mixers, juicers, boilers and industrial units.

However because many of the above items will require the usage of the electrical motor, it can get worn down quite easily. This is where electrical rewinding comes into effect. Depending on the type of motor used and how damaged it is will determine whether a motor can be rewound or not. Rewinding a motor is done for two primary reasons 1)to improve the efficiency of the motor 2)To maintain the level of heat generated by the motor. For anyone who has used a burnt out a piece of gardening equipment and burnt the motor out will understand how this can affect the productivity of the unit.

Spotting whether a motor needs rewinding or not is quite a difficult process, however, one of the key ways to check is to listen to the sound of the motor. If a motor makes a high pitched, or crackling sound repeatedly it will more than likely need rewinding. The rewinding process usually means replacing the winding mechanisms in the motor. To explain this further lets have a look at how a motor works.

A motor works by the process of electromagnetism. Say you had a nail and you wrapped electric coil around the nail and then attached this wire to a battery the nail would then become a magnet and have a north and south pole. However this is not a motor, all we have created is a magnet, to create a motor we need another magnet. By placing our nail on an axle and then placing a horseshoe magnet around this nail we now have the following electromagnet. If you positioned the North and South pole of the nail to the opposite sides of the horseshoe magnet they naturally repel each other and spin until they faced their respective north’s. However, this half turn is not a full spin and will not create the magnetic force we need to convert this electrical energy into true mechanical force. To do this the magnet must rotate during the half spin to main the repelling of the poles.
Without going into a physics lesson, the nail in a motor is called the armature. The armature has wire coil wrapped around it and a pair of plates are connected to the armature called a commutator.

As we can see the process of rewinding the motor means to wind the wires around the armature and may also involve replacing the metal commutator plates. It may sound a simple process however it isn’t. You have to take note of how the motor is setup how many rotations the copper wire has around the armature the position of the plates and the gauge of the wire. It may be better to take your motor to an approved repairer and rewinder of electrical motors

Neil Maycock writes articles for Motor Repairs Sheffield
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