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What is induction motor slip?

Induction motor slip is an important consideration when sizing an electric motor. So what is slip? One of the quirks of induction motors is that there is a difference between the rotor speed and the speed of the magnetic field – known commonly as ‘slip’.

Slip is expressed as a percentage of synchronous speed. For example, with 3% slip, a 1,400 rpm motor will have a shaft speed of 1,358 rpm. Slip varies pro rata to the load, so as the load increases, the slip rises in proportion to it and therefore an induction motor will not always achieve its rated speed.

One way to avoid slip is to use a synchronous reluctance motor, in which the rotor speed exactly matches the speed of the magnetic field. Synchronous motors are ideal for applications where a precise motor speed must be constantly maintained, so they’re commonly used to drive equipment such as conveyors, mixers and mills.

For all electric motor enquiries, call Gibbons’ Sales Manager Paul Scott on 01621 868138 or email paul.scott@gibbonsgroup.co.uk

Electric Motors

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