SPEED REGULATION

 

Speed Regulation of Induction Motors

The speed regulation of induction motor is defined as the change in the motor speed with change in load. It is expressed as a fraction or percentage of full-load speed, i.e.,

Speedregulation=Nnl−NflNfl×100%$$\mathrm{S}\mathrm{p}\mathrm{e}\mathrm{e}\mathrm{d}\mathrm{r}\mathrm{e}\mathrm{g}\mathrm{u}\mathrm{l}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}=\frac{{\mathit{N}}_{\mathit{n}\mathit{l}}\mathit{-}{\mathit{N}}_{\mathit{f}\mathit{l}}}{{\mathit{N}}_{\mathit{f}\mathit{l}}}\times 100\mathrm{\%}$$

Where,Nnl${\mathit{N}}_{\mathit{n}\mathit{l}}$ is the no-load speed of the motor and Nfl${\mathit{N}}_{\mathit{f}\mathit{l}}$ is the full-load speed of the motor.

The speed regulation of an induction motor is about 3% to 5%. Due to this small speed regulation, the induction motors are classified as the constant speed motors.