Transient model of a doubly excited reluctance motor

Abstract

A transient machine model of a doubly fed reluctance motor is derived by means of winding function and d-q transformation theory. The machine consists of a double wound stator having four and eight pole sets. The rotor is equipped with six poles. The machine, related to the Hunt motor, has a synchronous speed of a twelve pole machine. Comparison of simulated to tested results indicates that the higher harmonics in the motor inductances are impoaant for predicting current waveform.

The brushless doubly fed reluctance machine and the synchronous reluctance machine-a comparison

“…A revival of interest in the BDFRM over the last few years [2]- [8] has been motivated by its slip energy recovery nature which allows an adjustable-speed drive to be constructed with an inverter supplying, at most, half the machine's output power. This could be an important advantage in large drives (in particular, with restricted speed range), since the inverter is a major component of the system cost.…”

“…Recent work on the BDFRM has focussed on control strategies for the machine [4], [5], [7], [8], [10], and some work has also been done on its design and finite-element modeling [2], [11]. However, a comprehensive theoretical study of the machine properties has not yet appeared.…”

“…1 Where appropriate the comparisons are carried out in a machine independent fashion using normalized analysis techniques (see Appendix B). 2 Much of the work in this paper requires some background in the space vector theory and d-q modeling of the BDFRM. Good references for this are [3] and [9].…”

“…Note that with the BDFRM it is possible to have odd rotor pole numbers, which cannot occur with the SYNCREL. 2 Notice that a comparison with the SYNCREL is indirectly a rough comparison with the cage induction machine because of very similar performance of these two machines. Note 1: The primary reference frame is aligned with the primary flux vector which is constant in magnitude and frequency because the primary is connected to the grid.…”

Theoretical analysis of control properties for the brushless doubly fed reluctance machine

“…The tendency of the BDFRM control literature [7][8][9][10][11] has been to focus on particular applications or control aspects, and not to carry out a complete parameter independent analysis of the machine. The purpose of this paper is to fill this void with a theoretical study of the following BDFRM control properties: 1.…”