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The paper proposes a study of synchronization capability of line-start permanent magnet synchronous motor with small saliency ratio and very high cage resistance. The exemplified method is for a motor with the rated power of 3.5 kW, the synchronous speed of 3000 rpm, and the saliency ratio of 1.08.
The application of the permanent magnet disc motor (PMDM) is in electric vehicle and therefore there are several objectives that could be tackled in the design procedure, such as an increased efficiency, reduced total weight of the motor or increased power/weight ratio (specific power). In this paper an optimal design of a PMDM using efficiency and specific power as objective function is performed...
This paper presents an analysis of two different control strategies applied to a bidirectional dc-dc boost converter in a permanent magnet synchronous motor drive for hybrid electric vehicles. A constant rated voltage-fed inverter and a variable voltage control strategy that takes into account the motor mechanical speed to adjust the dc-dc converter output voltage are considered. Moreover, single...
The paper brings torque, power, efficiency and harmonic analyses of traction drive with permanent magnet synchronous motor (PMSM) during flux weakening operation. There is one way to weak flux of rotor permanent magnets - armature reaction caused by negative flux producing current component. On the other hand, the flux producing current component increases total RMS value of stator current. This effect...
International legislation demanding high efficiency motors is the great challenge facing motor manufacturers. The use of new topologies, materials and processes are the key to have motors accepted in the market. The use of fully processed steel has increased considerably in the last few years due to its competitive price and better magnetic properties. With lower losses and/or higher permeability,...
Increasing awareness of ecological problems forces machine manufacturers to design greener machines. This implies amongst other things the selection of the most efficient electric motor system for their specific application. On the other hand, machine building applications evolve more and more from constant speed and load characteristics to varying speed and load applications. Therefore, the motor...
In this paper, a method to obtain high efficiency at low speed region of permanent magnet motor with redundant structure is suggested. The output power of large permanent magnet motor like ship propulsion system varies very much as the speed changes. At low speed region, the output power of the motor is very much smaller than that of high speed region and the efficiency decrease also. In order to...
This paper presents two four-quadrant topologies for PMDC motor drives, built using combination of power electronics switches. The issue is the increased efficiency of the topology compared to conventional ones built using only one type of switches. The paper presents statistical and experimental data proving the efficiency of the suggest topologies.
A novel wide air-gap permanent magnet(PM) motor for low-noise water-pump is designed, whose rotor magnetic pole adopts Halbach array. Based on the character of this motor, finite-element method(FEM) is introduced to analyze its electromagnetic field distribution, and its air-gap induction, as well as its no-load back-EMF is calculated, considering skewed slot stator and the relative motion between...
Nowadays, more and more applications have been developed along with continuous research on magnetic suspension. In these applications, wide air gap structure always plays an important role. Therefore, bearingless motor with such structure which can provide large magnetic suspension force was proposed. This paper shows the experimental results of such bearingless motor based on a prototype model and...
In this paper, induction motor made of iron powder core is presented. Almost all HEV and EV use rare earth permanent magnet motor as a traction motor. Nowadays, resource crisis of rare earth materials is coming. This paper proposes novel induction motor made of Soft Magnetic Composite (SMC). The comparison of the loss characteristics of SMC induction motor and conventional laminated steel induction...
This paper describes a simplified sensorless vector control for permanent magnet synchronous motors (PMSM) using the average of the DC bus current. This method sets up the drive control system at relatively inexpensive because the micro controller does not need to have a precise timer and the calculation load is slight. The proposed method effectively changes two different current estimation methods...
This paper discusses the arrangement of the flux barriers in the stator of the outer rotor type IPMSM. IPMSM usually has the flux barriers for preventing the short circuit of magnetic flux near the permanent magnet. However, the flux barriers are used in the stator to improve the efficiency in this study. A two-dimensional finite element method (2D-FEM) is introduced to analyze the various modified...
This paper proposed the optimal rotor bar design of the permanent split capacitor (PSC) single-phase induction motor. The starting torque and motor efficiency were used as parameters for optimization. The Taguchi method was used in experimental designs for optimization of multiple parameters and the finite element method (FEM) analysis was used to compute and analyze the starting torque and motor...
An overview is given of conventional and modern large adjustable speed drive technologies (MW range). Overall efficiency is evaluated for different adjustable speed drive topologies, motor types, control methods and system configurations. Efficiency improvement opportunities are investigated. It is shown how modern technology can be applied safely with existing/standard petrochemical motors (identified...
This paper presents a 3-phase, 400 W, 14000 rpm, 2-pole/3-slot non-overlapping windings PM motor. In the design of the motor, Taguchi parameter method coupled with the finite element method (FEM) analysis is employed to minimize the level of cogging torque and maximize the efficiency of the motor. A mechanical analysis is carried out to investigate the mechanical feasibility of the rotor due to high-speed...
In this paper, a permanent magnet synchronous motor for ship propulsion is designed. The appropriate number of poles and slots are selected and the cogging torque is minimized in order to reduce noise and vibrations. To perform high efficiency and reliability, the inverter system consists of multiple modules and the stator coil has multi phases and groups. Because of the modular structure, the motor...
This paper presents the method to determine the optimum values of the capacitance and rotor-slot skew pitch to maximize the efficiency of a single-phase capacitor-run permanent-magnet motor using the time-stepping finite element analysis and response surface methodology. The optimum values of the capacitance and rotor skew pitch to maximize the efficiency at the rated voltage and output are obtained...
Higher efficiency electric motors can lead to significant reductions in the energy consumption and also reduce the environmental impact. In order to promote a competitive motor market transformation, a new international standard, the IEC 60034-30 has been approved. This standard globally harmonizes motor energy-efficiency classes in general-purpose, line-fed, three-phase, squirrel-cage, induction...
Variable refrigerant flow, or VRF, systems are popular in Japan for buildings' space conditioning needs, but have a very small market penetration in the United States. These systems are energy efficient and provide considerable comfort to occupants. Highly efficient motors, variable speed drive system and controls are the heart of the VRF technology. This paper provides research conducted by the Electric...
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