by Henry du Preez, Consultant
The rotor of an induction motor is a critical component and has a major influence on the motor performance.
Published in:
Electricity+Control, May 2016 (pages 30 – 33)
Enquiries: Email henry@hdupreez.co.za
The motor designer determines the motor characteristics with the design of the rotor and rotor bars. Change the bar profile and or material and the performance characteristics will change. This is an important factor which the repairers of electric induction motors must note. They need to take care that when they repair an induction motor rotor they make sure that the same material and configuration in all respects is the same as per the original design. Changes can be made but these must only be carried out after careful consideration as to the effect this will have on the operating characteristics of the motor. Changing the design of the rotor by replacing the brass or other high resistance bars on the outer cage of a double cage rotor will affect the starting torque or current, efficiency and characteristic of the motor.
Take note
- The rotor of a motor is a critical component.
- The rotor has a major influence on the motor performance.
- Test and inspections on the rotor bars can and should be carried out when a motor is opened.
Read the full article on Induction motor rotor bars in PDF format.
