Question

If the rotor power factor of a 3-phase induction motor is 0.707. The spatial displacement between the stator magnetic field and the rotor magnetic field will be

• A. ${45}^{\circ }$
• B. ${30}^{\circ }$
• C. ${75}^{\circ }$
• D. ${135}^{\circ }$

Answer 1

The correct option is D ${135}^{\circ }$

For a 3-phase induction motor, spatial displacement,
$\delta =90+{\varphi }_2$
where ${}^{\prime }{\varphi }_2^{\prime }$ is power factor angle,
$cos{\varphi }_2=0.707$
${\varphi }_2={45}^{\circ }$
$\delta ={90}^{\circ }+{45}^{\circ }={135}^{\circ }$