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A Rotor Speed Detector for lnduction Machines Utilizing Rotor Slots Harmonics and an Active Three-Phase Injection
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| Author(s) |
B. Hämmerli; R. Tanner; R. Zwicky |
| Abstract |
A new method to detect rotor speed electrically from rotor slots harmonics of a three-phase squirrel cage induction motor fed with a 20 kHz PWM inverter is presented. The rotor speed is detected in the range 20% to 100% of nominal speed directly by the rotor slots harmonics and in the range from 2% to 30% of nominal speed an additional 1 kHz three phase signal is fed from the inverter into the machine to produce an additional rotor-slot-rnodulation, which is used to detect rotor speed in this range. A comprehensive simulation of a model based on current distribution in the rotor and stator verifies the results of the realized drive. For the detector only a small amount of additional hardware is required. |
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| Filename: | Unnamed file |
| Filesize: | 2.844 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-03-01 by System |
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