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Proceedings ArticleDOI

A new Rotor Excitation Topology for Hybrid Excitation Machine

TL;DR: In this paper, an approach for accommodating both excitation windings and permanent magnets in the same rotor core of hybrid excitation machine is proposed in order to reduce the size of the machine.
Abstract: The Parallel Hybrid Excitation Machine (PHEM) has advantage of good flux regulation as compared to the Series Hybrid Excitation Machine (SHEM). While the series hybrid excitation machine has a simple rotor structure, the parallel hybrid excitation machines proposed so far in the literature have either complex structures or large in size to overcome the drawbacks of series hybrid excitation machine. Parallel hybrid excitation machines proposed so far have utilized two rotor cores for flux regulation. It increases the size of the machine. In order to reduce the size of the machine, an approach for accommodating both excitation windings and permanent magnets in the same rotor core of hybrid excitation machine is proposed in this paper. The proposed Hybrid Excitation Machine (HEM) has wide flux regulation capability. Thus the proposed HEM, which has only one rotor core, can overcome the drawbacks of both SHEM and PHEM. Detailed simulation results and experimental results are presented in the paper.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a series hybrid rotor excitation alternator (SHREA) was proposed, where permanent magnets and field windings are arranged in a single rotor ensuring series addition of permanent magnet flux and field winding flux.
Abstract: Parallel hybrid excitation alternators (PHEAs) are large in size but offers wide flux regulation capability. Series hybrid excitation alternator has limited flux regulation capability but compact compared to PHEAs. A new rotor excitation topology has been proposed for a series hybrid rotor excitation alternator (SHREA). The proposed machine is not only small in size but also have wide flux regulation capability. The proposed machine can be classified as a series hybrid machine as permanent magnets and field windings are arranged in a single rotor ensuring series addition of permanent magnet flux and field winding flux. In this study, one more rotor configuration for quick maintenance SHREA is also proposed. As the name suggests, for any fault in excitation winding, they can be easily replaced. Two 1.3 kW prototypes with such designs have been validated with finite-element method simulation and hardware testing.

4 citations

Journal ArticleDOI
TL;DR: In this article , the finite element analysis of hybrid excitation permanent magnet synchronous motors (HEMS) is presented, where a rotor including both permanent magnets and an excitation winding is adopted to modulate the rotor flux so that the motor exploits the maximum torque for any operating speed.
Abstract: This paper deals with the finite element analysis of Hybrid Excitation Permanent Magnet Synchronous Motors, that is, synchronous motors characterised by a rotor including both permanent magnets and an excitation winding. Such a winding is adopted to modulate the rotor flux so that the motor exploits the maximum torque for any operating speed. The higher benefit is obtained at speeds higher than the nominal speed, i.e. during the flux weakening operations. Thus the focus is to determine the performance of different topologies of hybrid excitation PM synchronous motors, considering compared to those achieved with a standard interior PM synchronous motors. The possibility to vary the rotor flux in the hybrid excitation PM motors allows to design the motor with a high no-load flux linkage, necessary to get high torque at low speeds, and to get high torque in a wide speed range.

3 citations

Journal ArticleDOI
TL;DR: In this paper , a new concept of high-speed permanent magnet synchronous machine with hybrid excitation on the stator (PMSMHES) is introduced, and its structure and electromagnetic parts are designed.

1 citations

Proceedings ArticleDOI
05 Sep 2022
TL;DR: In this article , an improved control strategy for hybrid excited permanent magnet (HEPM) motors in low-speed sensorless operating condition is proposed, where the rotor position is retrieved by exploiting the rotor anisotropy via high frequency (HF) voltage signals.
Abstract: This paper proposes an improved control strategy for hybrid excited permanent magnet (HEPM) motors in low-speed sensorless operating condition. In low speed region, the rotor position is retrieved by exploiting the rotor anisotropy via high frequency (HF) voltage signals. Non-zero cross-differential inductances induce an estimation error which could lead lower performance and instability issues. The proposed method exploits the excitation current of HEPM motor to reduce or even nullify the estimation error. The operating trajectory for stator and excitation currents is obtained via a two-step optimization procedure. The algorithm aim is the minimization of the position estimation error and the maximization of motor efficiency, by respecting the motor constraints. Simulation results validate the effectiveness in the position error reduction. Moreover, the efficiency of the drive under the proposed control strategy is compared to the benchmark maximum-torque-per-ampere policy.
Proceedings ArticleDOI
05 Sep 2022
TL;DR: In this paper , the authors presented the electro-magnetic, thermal and fluid dynamical analysis of a promising hybrid excitation permanent magnet motor, which is a synchronous motor characterized by a rotor including both permanent magnets and excitation windings.
Abstract: This paper presents the electro-magnetic, thermal and fluid dynamical analysis of a promising hybrid excitation permanent magnet motor. The hybrid excitation permanent magnet motor is a synchronous motor characterized by a rotor including both permanent magnets and excitation windings. Thus, it is possible an active change of the magnetic field by the excitation current control. 2-D thermal-fluid dynamic numerical simulations are carried out to study the heat exchange of a hybrid permanent magnet-salient pole motor. The air turbulent motion is analysed to understand how the heat transfer between salient pole surfaces and air takes place. Heat transfer coefficients are computed for different rotor speeds. Therefore, to carry out a simple and fast thermal analysis, heat transfer coefficients evaluated can be employed in a lumped parameters thermal network of the motor.
References
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Journal ArticleDOI
TL;DR: In this paper, a new topology of a hybrid excitation synchronous machine (HESM) was presented and operational principles and features of the new configuration were described using the radial/axial distribution of the magnetic field.
Abstract: We present a new topology of hybrid excitation synchronous machine (HESM) and describe operational principles and features of the new configuration. Using the radial/axial distribution of the magnetic field, we develop an equivalent magnetic circuit model. We obtain magnetic flux, flux density, and induced voltage with various electrical magnetomotive forces by calculating the nonlinear magnetic circuit equation. We studied the Influence on the radial magnetic field of the axial magnetic field by 3-D finite-element method. The results are in good agreement with calculation by our magnetic circuit model. Our findings indicate that the air-gap flux density of a flux-concentrating HESM is high and the magnetic field in the air gap can be successfully regulated. Experimental results of 3 kVA prototype machine verify the feasibility of the structure and the correctness of our analysis.

109 citations

Proceedings ArticleDOI
17 Jun 2001
TL;DR: This paper presents a hybrid excitation-type synchronous machine that has both a permanent magnet and wound fields on the same shaft and demonstrates the capability for field regulation.
Abstract: This paper presents a hybrid excitation-type synchronous machine. The new machine has both a permanent magnet and wound fields on the same shaft. The rotor structure that allows field regulation is shown. The test results obtained on a 0.75 kVA prototype machine demonstrate the capability for field regulation.

101 citations


"A new Rotor Excitation Topology for..." refers background in this paper

  • ...Rotor of a parallel hybrid excitation machine combines rotor of permanent magnet synchronous machine and conventional salient-pole synchronous machine [7]....

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  • ...Above mentioned PHEM topologies ([7], [8]) have relatively bigger size as it houses two separate rotor cores....

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Journal ArticleDOI
I. A. A. Afinowi1, Zi-Qiang Zhu1, Y. Guan1, J. C. Mipo2, P. Farah2 
TL;DR: In this article, a synchronous stator hybrid-excited, parallel flux path, synchronous machine of doubly salient topology is proposed, which has the novel features of: 1) hybrid dc field and permanent magnet (PM) excitation in the stator; 2) magnets placed in the slots between adjacent salient stator poles; and 3) the magnetic poles of PMs arranged, such that the flux premagnetizes the stators, but it is in a direction to oppose the dc excitation flux.
Abstract: A novel stator hybrid-excited, parallel flux path, synchronous machine of doubly salient topology is proposed. It has the novel features of: 1) hybrid dc field and permanent magnet (PM) excitation in the stator; 2) magnets placed in the slots between adjacent salient stator poles; and 3) the magnetic poles of PMs arranged, such that the flux premagnetizes the stator, but it is in a direction to oppose the dc excitation flux. The electromagnetic characteristics of the machine are analyzed on open-circuit and load. Since the new machine topology is developed from the variable-flux machine (VFM), a comparison of their electromagnetic torque and machine losses is conducted. The average electromagnetic torque of the hybrid-excited machine can be increased by 18% for fixed copper loss in comparison with the VFM due to the reduction of magnetic saturation in the stator. It is also shown that at high temperatures some risk of PM demagnetization exists when excited with dc and armature currents due to fringing flux that exists between the stator and the rotor poles. However, this affects only a very small area of the PMs. The performance of the hybrid-excited machine is predicted by a 2-D finite-element analysis and experimentally validated.

87 citations

Journal ArticleDOI
TL;DR: In this article, an alternative arrangement to conventional Lundell automotive generators is examined, which is characterized by hybrid excitation combining the high energy density of permanent magnets and the controllability of commonly used electrical excitation.
Abstract: In this paper, an alternative arrangement to conventional Lundell automotive generators is examined. This geometry is characterized by hybrid excitation combining the high-energy density of permanent magnets and the controllability of commonly used electrical excitation. The rotor geometry of the alternator is optimized by means of finite element (FE) simulations and a prototype design is developed. The formulation for the transient solver is given and the coupling of the FE model with an external circuit is explained in detail. The accomplished studies, simulations, and geometry optimizations are presented. In a final step, the simulations are compared to prototype measurements and confronted with conventional alternator geometries.

46 citations


"A new Rotor Excitation Topology for..." refers methods in this paper

  • ...FEM analysis is considered to be effective in analyzing the magnetic flux distribution and characteristics of electrical machine [9]....

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Journal ArticleDOI
TL;DR: In this paper, a hybrid excitation machine with isolated magnetic paths (HEIMP) is presented in order to extend the speed-operation range for constant generating voltage or constant motoring power of the electrical machine.
Abstract: In order to extend the speed-operation range for constant generating voltage or constant motoring power of the electrical machine, a new hybrid excitation machine with isolated magnetic paths (HEIMP) is presented in this paper. Its structure, operation mechanism, and two crucial design points are described in detail. A conceptual prototype machine is designed and manufactured in integration with a rotating-armature ac exciter (brushless). It is then simulated by finite element analysis software and tested in order to verify the efficient field-adjusting characteristics, the high efficiency, and the feasible design technique of the HEIMP machine. It is also shown that the integrated brushless design makes the system more compact and reliable.

36 citations


"A new Rotor Excitation Topology for..." refers background in this paper

  • ...The Hybrid Excitation Machine (HEM) is of great significance as it combines the advantages of both permanent magnet machine and conventional synchronous machine [1]-[5]....

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