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ROTOR DESIGN FOR INVERTOR-FED HIGH SPEED INDUCTION MOTORS
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| Author(s) |
L. Gertmar; C. Sadarangani; M. Johansson |
| Abstract |
This paper presents 2 different rotor slot shapes suitable for invertor-fed induction motors. The first slot has an U-shaped bridge at the bottom of the slot opening. The U-shaped bridge greatly reduces the rotor resistance at high frequencies at the same time increasing the rotor leakage inductance. The harmonic copper losses are therefore considerably reduced. The second slot has an iron bridge with a narrow slit suitably designed to control the saturation level. This slot shape gives high differential leakage resistance at reduced currents. For high speed self-ventilated drives this property can be utilized at lower speeds to extract a higher power level for the same motor frame size. Theoretical studies on the 2 slots are presented. An experimental setup and measurement method is described. Results from the measurement on motor drives with the different slot shapes are presented to verify the claims. |
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| Filename: | Unnamed file |
| Filesize: | 3.195 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-01-08 by System |
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