Modeling and Design of Contactless Sliprings for Rotary Applications

He, Guang; Chen, Qianhong; Ren, Xiaoyong; Wong, Siu-Chung; Zhang, Zhiliang

doi:10.1109/tie.2018.2860529

Cited by 21 publications

(12 citation statements)

References 28 publications

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“…Reluctance is a parameter describing the flux conduction capability of the magnetic circuit, and its effect is similar to that of the resistance in the circuit model. The reluctance magnitude is subject to the structure and size of magnetic coupler and the material permeability [22]. The reluctance with magnetic circuit equivalent length l can be expressed as follows:…”

Section: B Magnetic Circuit Modelingmentioning

confidence: 99%

“…From formula (22), the primary compensation inductance does not change during the process of UAV static charging.…”

Section: System Circuit Modelingmentioning

confidence: 99%

“…And the primary excitation current I P should be below 12A to limit the I 2 R losses. According to the formula (22), (26), (31) and L P = U P /jωI P , the variation range of the primary self-inductance L P is calculated to be 40-106µH. Considering a certain safety margin, the variation range of the L P is 50-100µH.…”

Section: Volume 8 2020mentioning

confidence: 99%

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Development of a Cross-Type Magnetic Coupler for Unmanned Aerial Vehicle IPT Charging Systems

Cai

Liu

et al. 2020

IEEE Access

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Inductive power transfer (IPT) is an optimal way for the unmanned aerial vehicle (UAV) wireless charging. The magnetic coupler is the key component in the IPT system, which determines the power transmission capacity and efficiency in IPT system. Due to the particularity of UAV application, the magnetic field height should be strictly limited to avoid the damage caused by high frequency magnetic field heat the UAV's metal equipment. A cross-type magnetic coupler with receiving coil placed on UAV's one landing gear was proposed to solve this problem, but it has the possibility of making UAV fuselage imbalance. Therefore, a novel cross-type magnetic coupler is proposed to overcome its difficulties in this paper, and most of magnetic fields are restrained to be lower than UAV's landing gear height h 1 = 145mm, which will not cause damage to the UAV's equipment. And a simple and practical iterative method for designing the magnetic coupler geometry parameters is proposed, with simplification of the complex design process for the finite element analysis, improves the design efficiency. The experimental results show that the system can charge the 260W UAV normally with the system efficiency of 91.577% within the misalignment range of X-axis direction 25mm, Y-axis direction 40mm and rotation 25 •. INDEX TERMS Unmanned aerial vehicle (UAV), inductive power transfer (IPT), cross-type magnetic resonant coupling, magnetic circuit model, coupler geometry parameter design.

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Section: B Magnetic Circuit Modelingmentioning

confidence: 99%

“…From formula (22), the primary compensation inductance does not change during the process of UAV static charging.…”

Section: System Circuit Modelingmentioning

confidence: 99%

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Development of a Cross-Type Magnetic Coupler for Unmanned Aerial Vehicle IPT Charging Systems

Cai

Liu

et al. 2020

IEEE Access

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“…where ω is the angular frequency, M is the mutual inductance, L s is the self-inductance of the secondary coil, and I p is the current of primary coil. For a CS system, L s is sensitive to M due to the strong coupling and related low leakage inductance [10]. So, L s for CS cannot be deemed as a constant.…”

Section: Power Transfer Capability Analysismentioning

confidence: 99%

“…where r ds(on) is the on-state resistance of a metal-oxidesemiconductor field-effect transistor (MOSFET) and V F0 and r F are the threshold voltage and equivalent resistance of a rectifier diode. It can be seen from (8) that the loss of the inverter is not directly related with M. Equations (9) and (10) indicate that the losses of the CS can be reduced by increasing the M of rotary transformer, and thus the PTE is increased.…”

Section: Loss Analysismentioning

confidence: 99%

LL‐delta structure for CS featuring high‐PTC

Chen

Ren

et al. 2019

IET Power Electronics

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Aiming to improve the power transfer capability and efficiency of contactless sliprings (CS), LL-delta structure for rotary transformer is proposed. Compared with the conventional UU structure, the effective cross-section of magnetizing flux for LL structures are increased, resulting in higher coupling coefficient (k), mutual inductance (M) and associated improved power transfer capability and efficiency, without the burden of size. The finite element analysis is performed and demonstrates that the power transfer capability of the proposed LL-delta structure is about 1.88-5.76 times larger than that of UU structure, and about 1.55-1.61 times larger than that of LL-basic structure. Three rotary transformers with UU, LL-basic and LL-delta structure are fabricated along with the comparative experiments. Measured results indicate that the proposed LL-delta structure has the largest product kM. With the same exciting current and the load quality factor, 2.06 kW output power is picked up for CS with LLdelta structure, whereas 1.08 kW for UU structure and 1.36 kW for LL-basic structure. The maximum efficiency for CS with LLdelta structure is 96.97%, which is about 0.7% higher than that of UU and LL-basic structures. The simulation and experimental results verify the effectiveness of the proposed structure.

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Crossed flat solenoid coupler for stationary electric vehicle wireless charging featuring high misalignment tolerance

Yao

Tang

Wang

2020

IET Electric Power Applications

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This study proposes a crossed flat solenoid coupler (CFSC) for electric vehicle wireless charging. The impact of four size parameters of CFSCs on coupling coefficient and misalignment tolerance is studied using finite‐element analysis. The optimisation methodology of CFSCs considering size constraints is given. The CFSC is compared with the planar square coupler (PSC) and double D coupler (DDC) from three aspects: coupling coefficient, misalignment tolerance, and copper usage. The CFSC performs the best in the three aspects, and the DDC performs the worst. Two wireless power transfer prototypes, one employing CFSCs and the other utilising PSCs, were built to demonstrate the superiority of the proposed coupler. Primary inductor‐capacitor‐capacitor secondary series compensation topologies were employed in the two prototypes. Experiments agree well with theoretical analysis and simulations. The power transfer efficiency of the CFSC‐based prototype was 1.6% higher than the PSC‐based prototype when the Z‐axis displacement is 45 mm.

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Modeling and Design of Contactless Sliprings for Rotary Applications

Cited by 21 publications

References 28 publications

Development of a Cross-Type Magnetic Coupler for Unmanned Aerial Vehicle IPT Charging Systems

Development of a Cross-Type Magnetic Coupler for Unmanned Aerial Vehicle IPT Charging Systems

LL‐delta structure for CS featuring high‐PTC

Crossed flat solenoid coupler for stationary electric vehicle wireless charging featuring high misalignment tolerance

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