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The introduction of aluminum shielding incurs eddy current effect, which weakens the self-inductance of transceiver coils. Simulation and experiments are carried out to find optimal shielding position to realize efficient and fast charging.
The model of mismatched transceiver coils in wireless power transfer system is proposed in this paper. System transmission efficiency and transferred power are analyzed against coupling coefficient. The mismatched charging scenario and ways to achieve optimal charging are investigated based on theoretical analysis and validated by experiment results.
Nowadays, rotating machines are widely used in most industries. Because of that, magnetic properties of soft magnetic material are actively studied under 1-D and 2-D magnetic flux excitations in order to estimate the total core loss produced by the material during the magnetization. SOMALOY 700 material, a soft magnetic composite material, is considered in this paper. 2-D magnetic measurement has...
Compared to permanent magnet motors using rare-earth metals, a wound field synchronous motors tends to generate more heat due to increased windings, so it is required to consider cooling measures in design. In this study, a 3D computational fluid dynamics simulation and experimental verification of an 80kW Wound Field Synchronous Motor was performed to investigate the cooling performance of dual cooling...
This paper presents a comparison of two structural coils (solenoid and planar spiral coil) for wireless power transfer (WPT) system in many ways. The impedance properties of two structural magnetic coils are discussed. And the influences of structural parameters (such as diameter, number of turns and layers) on the transfer performance are also analyzed. Furthermore, the magnetic resonance coupling...
The modal analysis plays an important role in analyzing the vibration and noise of the motors. The models of the stator which are based on the interior permanent magnet synchronous motors (IPMSM) by the 3D finite element software are analyzed. Firstly, it is significant to simplify the stator rind by considering the different components. Then the relationships of the different parameters of the stator...
The main factors affecting the electrical life of contactor are the arc and two bounces produced by the opening and closing of contact. Through the research of double coils AC contactor, this paper proposes a closed loop control method based on velocity. Through the velocity feedback, the excitation coil current is adjusted in real time so that the contactor can work at a predetermined velocity, reducing...
A novel method for post-assembly magnetization of surface-mounted permanent-magnet motors is proposed. The magnetizing windings are directly wound on the outer surface of the permanent magnet (PM), and then assembled on surface of the rotor. The PM poles can be magnetized and demagnetized after assembly by the integrated magnetizing windings. Once the PM poles experience demagnetization fault, the...
This paper compares the performance of Synchronous Reluctance Motors (SynRMs) using two different star-delta winding connections under normal operation. All the machine parameters are kept the same while the winding layout is only modified. The compared winding layouts differ in the combination between the number of coils of the star and delta winding sections. The two adopted windings are the only...
In this paper, comparisons between two permanent-magnet-free (PM-free) machines, namely a wound-field flux-switching machine (WFFSM) and a switched reluctance machine (SRM), covering skewed-rotor and straight-rotor structures are conducted. The topologies and operation principles of the WFFSM are illustrated firstly. Then, the effects of rotor skewing angle on static characteristics, e.g., open-circuit...
Demagnetization is one of the noticeable problems in almost every permanent magnet linear generator (PMLG) for oceanic wave energy conversion. To avoid the degradation of electrical power generation capability, a PMLG with a new feature of variable air gap length is proposed in this paper. To verify the effectiveness of the proposed method, a PMLG has been designed which is simulated for both the...
This paper proposes a novel variable reluctance hybrid magnet memory machine (VR-HMMM), which is geometrically characterized by doubly salient structure having homopolar hybrid magnets alternatively mounted on the stator poles. The magnetizing coils are wound on the PM excitation teeth to vary the magnetization states of low coercive force (LCF) magnets, and hence the air-gap flux can be flexibly...
Aiming at the problem of multi-DOF bionic drive, a new type of hybrid driven permanent magnet multi-DOF motor with liquid suspension mode is presented in this paper. The structure and working principle of the motor are introduced in detail. The analytical method and the finite element method are used to analyze the air gap magnetic field, and the results are compared and verified. In addition, the...
In this paper, a novel comprehensive design, including inverter and motor topology, and PWM scheme, is proposed to reduce iron losses for high speed induction motors. In the proposed method, two inverters are connected with a twin-coil motor. Two counteracting PWM schemes are applied in the two inverters, feeding the same fundamental currents into the twin coils, meanwhile switching in opposite phase...
This paper proposes a new design concept of small air-gap bidirectional Wireless Power Transfer (WPT) system using Dual Active Bridge (DAB) topology. The wireless charging coils are considered as a weakly coupled transformer having relatively high leakage inductance, and thus the new design can obtain soft switching without implementing resonant capacitor or external inductor. This design has a simple...
The overall efficiency of a marine electrical power system is reliant on its condition monitoring algorithm. A competitive system has quick fault detection functionalities and maintenance enabled. This paper examines existing method to develop an online approach for superior detection of eccentricity fault in surface-mounted permanent magnet synchronous motors, in a marine propulsion setting. Detection...
Ironless axial-flux machines present an attractive machine design avoiding core losses. The design challenge with these machines is to find a suitable winding arrangement that does not generate additional losses in return. In a novel approach of using a ceramic plate winding carrier, this paper discusses the design considerations for a four-pole, high speed axial-flux machine winding. The work compares...
With the increasing rotated speed of the magnetic electrical machine with active magnetic bearings (AMBs), improving the dynamic response and the resolution of the displacement sensor turn into a key problem. In this paper, a novel self-differential eddy current displacement sensor (ECDS) based on the Hartley principle for high-speed electrical machine was proposed. First, the integrated structure...
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