Torque analysis and slot regions assignment of a DC-excited flux-modulated machine with two stator windings

Jing Ou; Yingzhen Liu; Martin Doppelbauer; Jing Ou; Yingzhen Liu; Martin Doppelbauer

doi:10.3934/ElectrEng.2017.1.4

AIMS Electronics and Electrical Engineering

2017, Volume 1, Issue 1: 4-17. doi: 10.3934/ElectrEng.2017.1.4

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Torque analysis and slot regions assignment of a DC-excited flux-modulated machine with two stator windings

1.
Institute of Electrical Engineering, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
2.
Institute of Technical Physics, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany

Received: 07 July 2017 Accepted: 23 October 2017 Published: 23 November 2017

This paper presents a DC-excited flux-modulated (DCEFM) machine. It has one rotor with p_r poles and two sets of windings on one stator. One of the windings has p_f pole-pairs and is excited with DC current. The second winding has p_a pole-pairs and is excited with AC sinusoidal current. The relationship between p_r, p_f and p_a is p_r = p_f + p_a. The purpose of this paper is to analyze the torque of the machine in order to optimize the slot regions assigned to the two stator windings for generating the highest torque at the admissible copper losses. Firstly, the torque equation of the machine is derived. The methods described in this paper are also feasible for other machine types such as variable flux reluctance machine, field excited flux-switching machine. By using the finite element analysis (FEA) the analytical results are verified. The results show that the magneto motive forces (MMFs) of the two windings need to be approximately equal to obtain optimal torque.
- torque,
- DC-excited,
- flux-modulated,
- synchronous machine,
- reluctance machine
Citation: Jing Ou, Yingzhen Liu, Martin Doppelbauer. Torque analysis and slot regions assignment of a DC-excited flux-modulated machine with two stator windings[J]. AIMS Electronics and Electrical Engineering, 2017, 1(1): 4-17. doi: 10.3934/ElectrEng.2017.1.4

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Abstract

This paper presents a DC-excited flux-modulated (DCEFM) machine. It has one rotor with p_r poles and two sets of windings on one stator. One of the windings has p_f pole-pairs and is excited with DC current. The second winding has p_a pole-pairs and is excited with AC sinusoidal current. The relationship between p_r, p_f and p_a is p_r = p_f + p_a. The purpose of this paper is to analyze the torque of the machine in order to optimize the slot regions assigned to the two stator windings for generating the highest torque at the admissible copper losses. Firstly, the torque equation of the machine is derived. The methods described in this paper are also feasible for other machine types such as variable flux reluctance machine, field excited flux-switching machine. By using the finite element analysis (FEA) the analytical results are verified. The results show that the magneto motive forces (MMFs) of the two windings need to be approximately equal to obtain optimal torque.

References

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