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The eddy current induction in a conductive medium with finite width and thickness due to a moving magnetic rotor is studied. The presented formulation is based on the second order vector potential and the magnetic scalar potential and takes into account the magnetic field interaction through the edges of the conductive medium. The eddy current fields as well as thrust, lift and lateral force created...
This paper comprehensively investigates the voltage distortion (i.e. terminal voltage ripple) mechanisms in surface-mounted permanent magnet (SPM) machines equipped with a single layer fractional slot concentrated winding (FSCW). Stator flux gaps can be used in FSCW machines to increase the pitch factor and hence the winding factor, as well as to simplify the manufacturing process. Furthermore, they...
This paper presents the innovative design of an air cooled permanent magnet assisted synchronous reluctance machine (PMaSyRM) for automotive traction application. Key design features include low cost ferrite magnets in an optimized rotor geometry with high saliency ratio, low weight and sufficient mechanical strength as well as a tailored hairpin stator winding in order to meet the demands of an A-segment...
Surface Permanent Magnet (SPM) synchronous machines with fractional slot concentrated windings (FSCW) have been found to provide high torque density with low torque ripple and cogging torque, making them suitable for direct-drive electric vehicle (EV) application. This paper initially analyses a 3-phase 36/30 FSCW SPM machine for direct-drive application in terms of its space harmonics, steady-state...
Accuracy of system simulation for hybrid vehicle development is key when estimating the real energy saving that can be expected from a new technology. In case of claw pole machine, it becomes a challenge when we have to integrate in the simulation platform the actual control laws of the electrical machine, its self heating and the impact of the electrical network. A combined mapping and analytical...
The optimal integration of a high-frequency brushless electronic rotor supply (BERS) into the constraint space of a motor includes a variety of different challenges. This paper is devoted to the modelling of eddy current losses in wound rotor motors caused by a high frequency inductive transformer with a centric shaft opening. Due to a desirable high integration inside the motor as well as relatively...
In this paper, novel dual stator switched flux hybrid magnet machines (DS-SF-HMMM) are proposed. Two sets of armature winding are employed so as to improve the space utilization ratio and torque density. Whereas, two kinds of permanent magnets (PMs), i.e., NdFeB and low coercive force (LCF) magnets are placed on either a single stator or two separate stators. The proposed machines can provide the...
The goal of this paper is to propose a novel concept of permanent magnet machine with integrated airfoil-shaped rotor that can perform compression action. Electrically driven conventional compressor systems need electric machines as prime movers to provide mechanical energy to rotate the compressor. The proposed novel integrated permanent magnet machine system synthesizes both an electric machine...
In this paper, a novel variable-mode partitioned stator switched flux memory machine (PS-SFMM) with spoke-type low coercive force (LCF) permanent magnets (PMs) is developed. Due to the changeable magnetization level and polarity of LCF PMs, the PM pole number within inner stator can be purposely varied to either 12 or 6. Thus, this pole-changing concept enables PS-SFMM to behave similarly as 12-pole...
This paper is the sequel of a previous one [1] that introduced an innovative concept, validated both through modeling in time/frequency domains, and measuring its electrical effects on a prototype. This work finds here an outcome with the complete design of a product which turns to be mass-manufactured for the micro-hybrid or Stop-Start automotive market, after satisfying multiple requirements under...
A survey of mainly outer rotor permanent magnet (PM) motors, suitable for a patented sensor technology sensing the leakage field from the permanent magnets, is performed with a specified target of high torque density. One motor, known to yield high torque density is used as a reference motor; an electric bike transverse flux motor. Its simulated and measured results are compared with other PM motors...
Compared to conventional iron-core brush-type dc motors, the coreless types have no iron losses, low friction, and acceptable thermal dissipation, which make them extremely efficient. The design of their low-inertia rotor is the key to rapid acceleration and fast reaction time characteristics. In addition, their linear behavior fit well with simple drive circuits. A sub-category, namely coreless micro-motor...
Linear resonant actuators have been used in a wide range of applications because they utilize mechanical resonance and operate at high efficiency. However, the amplitude of LRAs severely decreases when external loads are applied. To solve this problem, we applied PID control to an LRA and the mover amplitude remained constant against an external load. When a large external load is applied with the...
Transverse Flux Machines are attractive for a number of applications where a high torque is required at a relatively low rotational speed. A typical drawback of motors of this type is a high cogging torque in relation to the overall torque output of the motor, this leads to a high torque ripple which can cause unwanted noise and vibration. A number of techniques have been developed that reduce this...
Salient pole synchronous machines (SPSYM) feature a high efficiency over a wide speed range and a high power density. Furthermore, the adjustable excitation as an additional degree of freedom can be used to optimize the overall efficiency and to control the temperature distribution between rotor and stator. Therefore, the SPSYM is suitable for drive trains of electric vehicles. For the excitation...
Salient-pole synchronous machines (SPSYM) combine a high power density with high efficiency over a wide speed range. In contrast to permanent magnet synchronous machines (PMSM), the field excitation can be controlled actively. Due to the adjustable excitation, flux-weakening is possible with reduced losses. The efficiency at partial load and at high speed can be improved. Furthermore, faults, such...
The paper aims at the feasibility assessment of an innovative rotating to linear motion magnetic converter incorporating a gearing function for short distance and low capacity electric transport applications. The contact-less transmission of the mechanical power due to the interaction of two on-board sets of permanent magnets (PMs) enables more efficient and reliable operation with respect to conventional...
The recent novel DC biased sinusoidal current reluctance machines (DC-biased VRMs) are similar to switched reluctance machines (SRMs) in terms of structure, as they both adopt the doubly salient structure and concentrated windings. However, the special characteristic of DC-biased VRMs is that their phase currents have both DC current and AC current. Therefore, it can be inferred that the vibration...
Vernier permanent magnet (VPM) machines have gained growing interest in recent years due to several advantages, including high torque density and simple mechanical structure. This paper presents a thorough investigation on the nature of fractional slot vernier permanent magnet (FS-VPM) machines with regular stator topology. Through analytical derivation, the configuration and performance of two winding...
We consider the improvement of the stator structure of self-propelled rotary actuator whose rotational axis is parallel to the exciting magnetic field. The stator of the actuator is constructed from the grain-oriented electrical steel sheet. The relation between the rolling direction of the steel sheet and the direction of the exciting magnetic field is important for the starting torque and rotational...
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