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CONTROL OF INDUCTION MOTORS USING PHASE CURRENT FEEDBACK DERIVED FROM THE DC LINK
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| Author(s) |
T. C. Green; B. W. Williams |
| Abstract |
A simple scalar controller for an induction machine has been implemented with a reduced sensing requirement. The technique developed allows the instantaneous line currents of an inverter supplied motor to be derived and assessed from the d.c. link. The fault current detection transducer normally present in the d.c. link of an inverter is utilized for this purpose. The derived current signals have a bandwidth limited only by the inverter switching frequency (and not the fundamental motor supply frequency) and are suitable for control purposes, particularly at low speeds. The scalar controller uses a simple estimation procedure based on the current signals to maintain a constant stator flux in steady-state. The low speed torque characteristic obtained with this drive is compared with a computer model to confirm correct operation. |
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| Filename: | Unnamed file |
| Filesize: | 549.1 KB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-09 by System |
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