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How Linear Induction Motors Work

The Linear Induction Motor is similar in construction to a circular motor that has been opened out flat. The magnetic field now sweeps across the flat motor face instead of rotating.

How it works diagram

The stator generally consists of a multi phase winding in a laminated iron core. When energized from an AC supply a travelling wave magnetic field is produced. Travel direction can be reversed by swapping two phases.

The reaction plate is the equivalent of the rotor. For single sided applications this is usually a conductive sheet of aluminium or copper backed by steel, and for double sided applications only a conductive sheet is used.

Currents induced in the reaction plate by the stator travelling field create a secondary magnetic field. It is the reaction between these two fields which produces the linear thrust.