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Basics of Linear DC Motors

By May | Published on Sep 17,2015

A linear dc motor, like a rotating dc motor, converts the electric energy into mechanical energy through the interaction of current in conductors and magnetic flux provided by permanent rare-earth magnets. It is composed of a stator assembly and a slider. The stator assembly acts as the body and has a laminated steel structure with conductors wound in the transverse slots. The slider contains one or more sets of magnets, commutation components, a bearing surface, and its body forms the magnetic flux path between the magnets.

The brush-type slider carriers two sets of brushes. One set of brushed obtains the power from a pair of copper rails, and the other set transfers power into the conductors located under the slider through commutator segments.

The brushless slider contains an additional set of magnets which will activate Hall-effect sensors and solid-state switches to commutate the motor windings. The positioning system of a dc linear motor is pretty stiff, fast, and efficient. It is able to reach the high precision accuracy to 0.1 micron and it is not easy to be worn out. It can drive loads directly, obviating the need for gears and lead screws. Its typical range of thrust and travel is 2.5 to 2,500 lb and a few inches to about 4 ft. The above information is a brief introduction to the linear dc motor, hoping which will help you.


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