What is Inside Sewing Electric Motor

Sewing Electric Motor - Repair Tips

Let's look what is inside a sewing electric motor. These photos help you understand how to clean and to fix an electric motor of home sewing machine.
Note: Industrial sewing machines do not use such motors.
First, it should be noted that this type of motors is used on older models of sewing machines. Modern models of sewing machines are equipped with electric motors that are located inside housing of sewing machine.

External type of sewing machine motor

External type of sewing machine motor

This is external type of sewing machine motor that can easy to replace. The motor is attached directly to body of sewing machine with a single screw. This type of electric drive is used for older sewing machines.

Two screws for adjusting a belt tension

With these screws the motor is mounted to support. This mount having two screws allows you to adjust a belt tension.

How to remove a pulley

Bracket of motor housing

Remove this bracket from the motor housing at first.

How to remove a pulley

If you unscrew the screw you will be able to remove a pulley.

The pulley is removed with effort

Note: The pulley is removed with effort.

The pulley made from metal

The pulley can be made from metal or plastic.

How to disassemble motor casing

How to disassemble motor casing

Now let's look inside the motor housing. The shell of sewing machine motor has two parts that are fastened together by four screws.

Shell of motor has two parts

Unscrew these screws with flat screwdriver to remove covers.

Sewing electric motor - view above

Sewing electric motor - view above.

Sewing Electric Motor - Repair Tips

At this photo is shown a commutator bar

At this photo is shown a commutator bar (an armature) of electric motor. Its surface should not have any dirt and scratches.

Check these contacts first

If the motor does not works, check these contacts first.

Checking an integrity of wire windings

Checking an integrity of wire windings is possible only by using a special device.

How to oil inner details of motor

How to oil inner details of motor

An axis a motor has two bearings that should be lubricated with a few oil drops.

Pour here two or three drops of oil

Pour here two or three drops of oil, no more.

Opposite side of electric motor

On the opposite side of electric motor also needed add two or three drops of oil.

Copper wire windings

Copper wire windings must have a clean light look.

Sewing electric motor brushes

Sewing electric motor brushes

Such sewing electric motor has two carbon brushes.

How to straighten out cooper plates

To remove these graffiti brushes you need straighten out these cooper plates first.

Inside is mouted a spring

Be careful, inside is mouted a spring and carbon brushes can "jump out".

Springs with carbon brushes

These springs press the carbon brushes closer to commutator bar surface.

Surface of the commutator bar

Surface of the commutator bar (an armature) must be clean and smooth.

How to clean surface a commutator bar

To clean this surface you can using an usual paper only.
Note: Never use abrasive materials.

Clutch Motor of Industrial Sewing Machine
Clutch Motor of Industrial Sewing Machine

The industrial sewing machines have special clutch motor at which the machine is able to work 24 hours a day without interruption and at a high speed.

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Sewing Machine Foot Control Pedal - Repair Tips

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