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A combined encoder and rotor-current-sensor fault detection and isolation algorithm for doubly-fed induction machines is presented. A rotor-position and current estimator based on air-gap power vector computation is used for residual generation. A cumulative-sum function permits detecting and isolating the investigated faults. The algorithm is experimentally tested on a 3 kW generator in steady and...
Wind farm tie-lines need to complete the relay protection, but existing tie-lines, or not set protect at wind farm side, or the protection may be affected by wind farm characteristic and misoperation. This paper first analyzes the DFIG short circuit current characteristics; draw DFIG short circuit current be closely connected with fault time, fault modes, the Crowbar circuit whether action, voltage...
Externally excited synchronous machines exceptionally suit the needs of axle drives in automotive applications due to their high efficiency over the whole operation range and the advantages for the realization of the functional safety. With the rotor current giving an additional degree of freedom new possibilities and necessities come up, bearing special challenges regarding the control. A loss minimum...
Field oriented control schemes may use different methods for the acquisition of the orientation angle and can operate with or without encoder. In this work the usual variants of field oriented control are implemented and the viability of making the detection and diagnosis of incipient rotor asymmetries in the squirrel cage of induction machines (IMs) is discussed. Then, the utilization of an online...
Parametric motors offer numerous attractive features not found in ordinary motors, such as overload protection, simple construction, low cost, and low noise. This paper discusses the mechanism of iron losses occurring in the cores of a parametric motor, with a view to further improving the motor's characteristics and putting it to practical use. It is shown that the greater part of the iron loss in...
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