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In this study slip permanent magnet couplers (slip-PMC) for wind turbine application are introduced and their analysis technique used in finite element method (FEM) is presented. Two optimization methods are employed in determining optimum permanent magnet (PM) rotors for a fixed wound rotor size. The machine topologies, namely surface-mounted and spoke-mounted PM rotor topologies are evaluated against...
This paper compares performances of fractional-slot concentrated-wound (FSCW) and distributed-wound (DW) interior permanent magnet (IPM) machines when they are equipped with various commonly used rotor topologies such as V-type, double V-type, flat-type, double flat-type, and spoke-type magnets. In order to have a fair comparison, a multi-objective design optimization procedure based on an evolutionary...
In this paper the pareto front of flux reversal machines regarding torque, torque-ripple and normal forces is determined. For this reason a fast, but accurate, analytical calculation method is provided. An optimization procedure is given to realize an optimal design for each topology.
Flux-switching permanent magnet machines (FSPMMs) have been investigated for hybrid electric vehicles (HEVs). This paper presents an optimal FSPMM with 12 stator poles to meet the minimal performance specifications required by the drive machine in the 2010 Prius HEV. After a qualitative analysis based on size equation to briefly compare performances of FSPMMs with four rotor topology structures, a...
The power density of electrical machines required for transport applications has become a critical aspect and target of optimization. This paper looks at the development aspects of a multi-domain tool to aid for system-level optimization of electrical machines within next-generation high power-density applications. The electromagnetic, thermal and mechanical aspects are wholly integrated, thus enabling...
We proposed a topology optimization method that incorporates the concept of cluster and cleaning method in Genetic algorithm (GA). This method can design a rotor structure from the empty space, which has high output power and less permanent magnet volume. In this paper, the effect of strength of the cleaning method on the obtained rotor structure is investigated. Using the optimal strength of the...
A topology optimization method to maximize efficiency of IPM motors is proposed. In this method, the rotor topology is represented using on/off method based on the normalized Gaussian network. To obtain rotor shapes which are easily manufactured, a regularization term is introduced in the objective function. Moreover, a post-processing method which helps users interpret the optimization results is...
The main purposes of this paper consist of two parts: Firstly, the geometric topology and operation principle of a novel outer-rotor-permanent-magnet flux-switching (ORPM-FS) machine is proposed and simply introduced. Secondly, based on 2D finite element method, phase back electromotive force (back-EMF) waveform of the ORPM-FS machines with different combinations of stator slots and rotor poles is...
This paper presents topology optimization of rotating machine rotors considering localized magnetic degradation in rotor and stator cores caused by the manufacturing process. On the basis of experimental observation, magnetic reluctivity is assumed to exponentially decay as approaching to the processed surfaces. The present topology optimization seeks for optimal rotor shapes which are robust against...
An analysis of Hybrid Excitation Synchronous Generator (HESG) topologies for a direct drive wind turbine is investigated. Through an optimization process, the topologies of HESG are compared regarding the cost and the total losses. The optimizations are performed at the nominal on-load operating point of the generator. The trade-offs between each topology are analyzed according to a set of Pareto...
The purpose of this study is to find a motor topology which offers the best combination of both permanent magnet and reluctance torque components as well as the best possible torque per volume ratio. To perform this task a topological optimization method using genetic algorithms, embedded into experience based design is proposed. The interacting principle of permanent magnet and reluctance torque...
This study is used to highlight the potentials of flux switching PM machines for medium-speed wind generator drives, considering among other things, that the rotor pole number is critical to the electromagnetic torque output. The initial result obtained by finite-element simulations and theoretical analyses of the pre-optimised 12/10 FSPM topology compared to its 12/14 counterpart show that with higher...
High performance operation of high-speed electric machine leads to a demand on high switching frequency, which results in inverter heating, short lifespan, large heat sink, etc. In this paper, high-speed permanent magnet synchronous machine drive with IGBT based three-level T-type inverter (3LT2I) and two-level inverter are investigated and the losses in the machine and inverter are compared. A 200kW...
The relationship between the well known competitive torque density and less competitive power factor of reluctance synchronous machines is investigated. The study consists of a multi-objective design optimisation implementing a weighted factor optimisation technique. The investigation was carried out by implementing a complete machine model in the optimisation, with varying machine pole number and...
In this paper an investigation into an alternative reluctance synchronous machine rotor flux barrier topology creation technique is presented. The technique investigated implements a high number of flux barrier variables with an alternative asymmetric rotor structure topology in combination with optimisation and finite element analysis. The investigation focuses on maximising average torque and minimising...
Flywheels feature relatively low size, long lifetime and robustness and are, therefore, very attractive as energy storage devices. In case of long term energy storage, low idle losses are essential to keep the stored energy in the system. The motor generator set for mechanical energy storage systems are most likely permanent magnet, synchronous and switched reluctance machines. In this article, the...
The paper presents an analysis of performances for studied electrical machine design for small power automotive application. The electrical machine under study in this paper is flux switching permanent magnet synchronous machine. After the computation of the machine main dimensions using an analytical algorithm, a Hooke-Jeeves optimization procedure was implemented in order to obtain the optimal geometry...
This paper proposes a topology optimization method to optimize the distribution of material within an electrical machine using a genetic algorithm (GA) and considering the types of materials used. The rotor structure in a permanent magnet synchronous motor with concentrated windings is used to demonstrate the proposed method; a rectangular current and sinusoidal current excitation scheme are considered...
Currently, the main technical weaknesses of Electrical Vehicle (EV) are the limitation of the on-board energy storage and the time to recharge it. Despite of recent improvements in batteries, these drawbacks as well as the cost make the EV not yet attractive. Real challenges for Power Electronics engineers are not only the cost reduction through new system optimizations but also the autonomy increase...
A compound-structure permanent-magnet synchronous machine (CS-PMSM) is a hybrid electric vehicle (HEV) power train concept to realize both the torque and speed control of the internal combustion engine (ICE). It is integrated by two permanent-magnet synchronous machines. Different topologies of the CS-PMSM are proposed. The characteristics of different CS-PMSMs are compared and evaluated from the...
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