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Based on previous research experience proved by simulated and experimental results a comparative discussion about advantages and disadvantages of using Vector Control or Direct Torque Control for PM-SM drives is presented.
Electrically Excited Synchronous Motor (EESM) serves as an option on hybrid vehicle applications. An EESM for mild hybrid application is designed in this study. Copper loss minimization and field current minimization are analyzed for current control strategies of EESM. Both of the current control strategies are applied and comparisons between the two are made thereafter. In both of the strategies,...
Wheel hub drives provide the opportunity to control the torque at every wheel independently. Thus, safety functions like anti-lock braking system (ABS) or electronic stability control (ESC) can be implemented in the drives as well. This enables the substitution of friction brakes at the driven wheels by electric drives. In this paper, resulting requirements for the drive system are presented and an...
Efficiency improvements attainable with permanent magnet motors have been well documented. Some permanent magnet motors have been equipped with an induction cage in the rotor to allow direct on line starting. Designs of this type have been referred to as line start permanent magnet motors. A topic that has not received much attention is the use of this type of motor with an adjustable speed drive...
This paper deals with the configuration of a simple Solar Panel and proposes a few methods to maximize the efficiency of the Photovoltaic Panel using microcontroller chip. Additionally, through the case study of an Educational Institution with a Solar Plant, this paper attempts to explain its benefits and efficiency. With the help of observations on the case-study Solar Plant of the Institute, a suitable...
The impact of GaN devices and the improvement in efficiency while using such devices in three-phase traction inverter for Electric Vehicles are presented in this paper. Two versions of inverters have been illustrated: first one with Si-IGBT devices while second one is built with GaN-MOSFETs with similar rating of voltage and current. The loss model is expounded for both the inverters; thereafter total...
TextSle industries use energy both in the utilities and process. Electrical energy is also used in these areas. Energy audit provides the scope of energy savings in different utilities and process of textile industries. Electric motors contribute to more than 70% of the total electrical load. Three phase induction motor is prominently used in the textile industry because of its ruggedness and versatility...
Converter losses can be reduced by use of new components like SiC or GaN, but unfortunately they come with prohibitive prices. Another way of reducing losses is employing PWM clamping techniques. The method proposed in this work is based on PWM clamping following the maximum current for reducing the switching losses of the converter. The simulation and laboratory tests are showing a relative power...
Motors using rare earth elements have high efficiency and torque density, but they have the drawback of a high price. Thus, this paper proposes the use of ferrite instead of rare earth elements to increase the torque density and decrease the material cost. This paper discusses models with structures that increase the flux per pole and saliency ratio. Using the finite element method, the models are...
In this paper, a new method for controlling power factor in permanent magnet synchronous motor has been proposed in order to improve efficiency and decrease losses. In order to reach a in-time control for power factor, we have focused on parameters like current angle, torque angle, stator voltage and current in d axis stator. To this end, current angle, torque angle and stator voltage are considered...
This paper discusses the effects of voltage and frequency variation on squirrel cage induction motor performance. The major focus is the impact on efficiency, thermal insulation life, starting characteristics, reliability and cost penalties. Transient voltages are identified and harmonic distortion issues are addressed. Voltage/ frequency issues associated with adjustable frequency drive applications...
The advantages of using permanent magnets (PM) in electric motors to increase efficiency are well documented [1]. Due to the synchronous operating nature of a PM motor, most motors of this type are used in combination with a variable frequency drive (VFD). PM motors capable of direct on line (DOL) starting have been manufactured for over 30 years [2], but the application of this technology has historically...
In this paper, we propose a control strategy for a wind turbine that employs a hydrostatic transmission system for transmitting power from the wind turbine rotor via hydraulic transmission line to a ground level generator. Wind turbine power curve tracking is achieved by controlling the hydraulic pump volumetric displacement and, at the other end of the hydraulic line, the hydraulic motor volumetric...
A method is described to assist in the analysis of test results and the comparative ranking of induction motors from different manufacturers after test evaluation. The suggested approach is intended to simply the decision making of purchasers who are evaluating products from different manufacturers through testing. The ranking system considers various performance parameters and is based on industry...
In this presentation the development of an induction motor of which stator core is made of molded SMC (Soft Magnetic Composite) will be presented. The molded core shows low iron loss compared to the iron loss of machined core. Iron loss of machined core is large because of the heat at the machining of bulk SMC. Moreover, by using SMC, 3D shaped core is easily constructed. The teeth of the stator core...
Synchronous motors continue to be a viable alternative to induction motors because of efficiency advantages. Long used for providing leading kVARs for PF improvement and helping with the device switching in Load Commutated Inverter (LCI) drives, these machines are efficient prime movers for large Mill applications. Both in motor efficiency and in low base speed configurations the synchronous motor...
Brushless direct current (BLDC) motor is now widely used for industrial and automotive field since its efficiency is higher than a permanent motors and it has relatively small size. Therefore modelling of BLDC was necessary for its application. The objective of this research was to investigate the performance of BLDC motor modeled by using ANN. The target for this work was to get the maximum power...
In this paper, an optimal reference stator flux strategy is proposed to improve the drive system efficiency under direct torque control (DTC). A novel low cost interior permanent magnet synchronous machine (IPMSM) is introduced and used. Based on the easily implementable loss model (LM), the controllable electrical losses which consist of copper loss and iron loss have been minimized under optimal...
Reduction of permanent magnet materials in electric machines is of interest to many machine manufacturers and designers as cost of rare-earth materials is of increasing concern. The impact of changing a machine design parameter, such as the shape of the magnets, may have consequences such as a reduction in efficiency, or introduce a change in torque quality. In this paper, an efficiency map computation...
In this paper, rare earth free, traction motor is discussed. An induction motor does not require any permanent magnet as its principle. The technology of an induction motor is thought as a mature technology. The author introduces new technology into an induction motor. The iron core of the motor is made by Soft Magnetic Composite (SMC). Conventionally, the core is consisted by laminated punched steel...
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