Slip Formula – Slip and Slip Speed Formulas in an Induction Motor

In an induction motor, the voltage induced in the rotor bar is dependent upon the speed of the rotor relative to the magnetic field. This relative motion of the rotor and magnetic field can be expressed either in terms of slip speed or as slip.

Also see: Top 5 Practical Applications of Induction Motors in Daily Life

Slip Speed

The difference between rotor speed and synchronous speed is known as slip speed.

Slip Formula

Slip is defined as the relative speed of the motor expressed on a per-unit or percentage basis.

The above formulas can be expressed in terms of angular velocity as well:

By interchanging factors in the above equations, one can express the mechanical speed of the rotor shaft in terms of synchronous speed and slip. By interchanging the above factors we obtain:

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