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Research conducted previously has shown that a battery electric vehicle (BEV) motor design incorporating drive-cycle optimization can lead to achievement of a higher torque density motor that consumes less energy over the drive-cycle in comparison to a conventionally designed motor. Such a motor indirectly extends the driving range of the BEV. Firstly, in this paper, a baseline fractional slot concentrated...
This paper investigates the torque production and the torque ripple reduction of 6-stator/7-rotor-pole (6/7) variable flux reluctance machine (VFRM). Based on the harmonic analysis, the instantaneous torque equation is firstly derived by considering the spectra of the armature inductance and current. The average torque is found to be mainly produced by the mutual inductances between the field and...
An investigation into magnetic gear modulating ring design shapes and the performance of a magnetic gear integrated into an induction machine are presented. Modulating ring construction is one of the more difficult aspects of magnetic gear design, and a compromise between magnetic performance, losses in conductive supporting parts and manufacturability is often required. Six possible designs for modulating...
Induction motors, which have been widely used in various practical applications, such as fans, pumps, machine tools, vehicle traction motors, etc., are truly the industrial workhorses over the past 120 years. To improve the sensorless induction motor control performance and develop more fault-tolerant motor drives, the paper presents a novel sensorless direct torque control approach based on the proposed...
This paper investigates the use of the Taguchi method based regression rate optimization method for the design of line-start permanent magnet motors. A weighted factor multi-objective (MO) technique is used to take into account both steady-state and transient performance objectives. To validate the proposed method a prototype machine has been designed, constructed and experimentally evaluated. It...
A novel 4/4 stator/rotor single-phase doubly salient permanent magnet machine (DSPMM) with asymmetric stator poles is proposed in this paper. The stator poles of proposed machine are distributed non-uniformly along the circumference of the stator yoke. Firstly, it investigates the new topology and operation principle based on diagram description and mathematical derivation. Then, the dimension equation,...
This paper proposes a slotless, lightweight permanent magnet (PM) motor for drone applications. This research analyzes the steps through FEA to achieve the torque speed profile required for drone applications with optimum pole count for the base speed. A comparison on slotless vs slotted stators is presented. In addition, an optimization using halbach configuration proves to give a superior design...
The use of direct drive machines in renewable and industrial applications are increasing at a rapid rate. Transverse flux machines (TFM) are ideally suited for direct drive applications due to their high torque density. In this paper, a comprehensive review of the permanent magnet (PM) TFMs for direct drive applications is presented. The paper introduces TFMs and their operating principle and then...
Memory machines (MMs) equipped with low coercive force (LCF) permanent magnet (PM), e.g. AlNiCo and high coercive force (HCF) PM, e.g. NdFeB, possess the advantages of high power density, high efficiency and high efficient flux-regulation capability. In this paper, a robust control strategy to achieve the maximum torque output in different speed region is proposed and implemented on a hybrid permanent...
Recently, there has been interest in using alternative conductor geometries such as Litz wires, transposed conductors, rectangular, and form wound conductors for realizing electric machines to increase the armature current density and thermal performance. Among these, the application of foil conductors has been demonstrated in an axial flux machine and a preliminary study on the AC loss modeling and...
This paper proposes a novel three-part hybrid rotor design for a permanent magnet synchronous machine (PMSM). The hybrid rotor can be designed to achieve key desired parameters and obtain extended speed operation by combining simple PM and reluctance rotor designs. An additional degree of freedom in the proposed three-part hybrid rotor is the flexibility to align the magnetizing axis of the reluctance...
This paper presents a novel Flux Switching Transverse Flux Machine (FS-TFM) topology. This new topology is well suited to use low cost ferrite magnets in a flux focusing design to achieve high torque density. An electric scooter traction motor featuring the proposed topology is designed using soft magnetic composites through 3D finite element analysis. Design optimization and analysis are conducted...
Axial flux permanent magnet (AFPM) synchronous motors are attractive for low speed direct drive systems because of their high specific torque. The present paper proposes a novel axial flux machine topology, called MAGNUS, obtained by combining a yokeless central stator type NS arrangement with two external high polarity spoke-rotors, resulting in very high flux concentration. The stator, which includes...
Back-EMF self-sensing is commonly used in induction machine (IM) drive systems. Deadbeat-direct torque and flux control (DB-DTFC) has also shown to be a highly effective method for IM control. At low speeds, accurate machine parameters are important for both DB-DTFC and back-EMF self-sensing performance. In this paper, an injection-based real-time parameter estimation method in IM DB-DTFC drives for...
Interests in using rare-earth free motors such as switched reluctance motors (SRMs) for electric and hybrid electric vehicles (EV/HEVs) continue to gain popularity, owing to their low cost and robustness. Optimal design of a SRM, to meet specific characteristics for an application, should involve simultaneous optimization of the motor geometry and control in order to achieve the highest performance...
This study investigates the effect of different skewing methods and angles for switched reluctance machines (SRM) having high pole count using multiphysics simulations. A 24/16 SRM is modeled for each skewing method and different skewing angles using 3D electromagnetic finite element analysis (FEA). Mechanical and acoustical analyses are performed to evaluate the effectiveness of different skewing...
In this paper, we investigate the variation in characteristics of variable speed induction motors fed by inverters with grades of core materials used for stators and rotors from both results of measurement and finite element analysis. Identical shaped stator/rotor cores are manufactured by using several kinds of electrical steel sheets from low to high grades. Then, the characteristics of these motors...
This work investigates maximum efficiency control strategies of permanent magnet (PM) traction machine drives that are adopted in General Motors (GM) hybrid and electric vehicles. First, three different current vector control techniques, Maximum Torque Per Ampere (MTPA), Maximum Torque Per Motor Loss (MTPML), and Maximum Torque Per System Loss (MTPSL), are presented to identify the most attractive...
This paper proposes an Energy Management System (EMS) of the electrical plant of a yatch with a DC micro-grid structure. Such an EMS has as target function the reduction of the DE fuel consumption and correspondingly of the related polluting emission. A complete dynamic model of the electric plant of a yacht has been presented. In particular, assumed that the main electrical generator of the ship...
The main theme of this paper is to propose a self-commissioning technique for high bandwidth servo drives. The presented self-commissioning technique include auto-identification of servo motor parameters and on-line calculation of controller gains of servo drives. The electrical parameters required for current controller, including stator resistance and inductance are identified under standstill....
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