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Indirect Phase Current Detection for Field Oriented Control of a Permanent Magnet Synchronous Motor Drive
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| Author(s) |
J. F. Moynihan; R. C. Kavanagh; M. G. Egan; J. M. D. Murphy |
| Abstract |
The field oriented control of a permanent magnet synchronous motor with feedback derived from the dc link current of the inverter is investigated. The derived current signals are updated at the switching frequency of the PWM inverter. The current control algorithm is based on a model of the machine in the rotor reference frame. A space vector modulation strategy is used to determine the switching instants of the voltage source inverter. It is shown that the inverter states in each modulation cycle are such that the values of each of the phase currents can be obtained. Under certain operating conditions, some adjustment of the space vector is required to ensure that reliable samples of the dc link current are acquired. Two such adjustment mechanisms are proposed. Detailed simulations of both strategies are carried out to assess their suitability and accuracy. |
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| Filename: | Unnamed file |
| Filesize: | 4.173 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-06 by System |
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