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This paper introduces the design and performance analysis of an interior permanent magnet generator (IPMG) for applications in low speed wind turbine systems. The developed design is based on optimizing the geometry of double-layered permanent magnets (PMs), which are buried in the rotor body of an IPMG. The geometry of the double-layered permanent magnets is optimized and simulated using the 2-D...
Due to the naturally high torque ripple and non-linear characteristics, the applications of Switched Reluctance Motors (SRM) drives are very limited. It is well known that the Torque Distribution Functions (TDFs) method is one of the most effective methods to reduce their torque ripple. This paper presents an analysis of the drawback of TDFs when they are utilized for SRMs with high non-linear characteristics...
Permanent magnet synchronous machines (PMSMs) are widely used as traction machines in the hybrid and electrical vehicles (HEVs) due to their high power density, wide field weakening range and high efficiency. An optimized and efficient design of PMSMs depends upon the driving cycle requirements and consideration of losses of every subsystem in the traction drive. Efficiency of a traction drive over...
After a brief reminder about advantages and problems related to the application of large displacement elastic joints in robotic structures, this paper outlines an approach for quantifying the joint's performance in terms of selective compliance (i.e. capability of providing low stiffness along a single desired direction). Local and global performance indexes are proposed which can be used to discern...
In this paper, a combined wye-delta connection is introduced and compared with a common wye-connection of a concentrated winding. Because the combined wye-delta connection has a higher fundamental winding factor, the output torque is higher for the same current density when a sinusoidal current is imposed. As the combined wye-delta connection has only a minor influence on the losses in the machine,...
This paper discusses about the effects of cogging torque due to the amount of stator slot present in a typical permanent magnet generator using finite element analysis. All parameters other than stator slot number are kept at a constant to extract the cogging torque waveform on each run of the simulation using the weighted stress tensor method. The design of the generator itself is also kept at a...
The selection and design of motor for electric and hybrid vehicle is very important as the motor in this application should posses high power density, higher efficiency, fit in to limited space, and supreme heat removal capacity. One of the better selection for this kind may be an axial flux brush less DC motor. In this paper, an axial flux brush less DC motor is chosen for the study. A preliminary...
This paper presents the effects of dynamic air-gap eccentricity (DE) on the performances of a 6/4 Switched Reluctance Machine (SRM) through finite Element Analysis by means of Finite Element Method Magnetics (FEMM). The Time-Frequency Representation (TFR) is carried out to study the effect of DE on the output torque signal. Time-frequency representation is an appropriate tool for detecting the mechanical...
A new torque cancelling system (TCS) that stabilizes mechanical sway in quick-motion robots is discussed in this paper. It cancels the reaction moment generated by the motion of an object by considering the precise dynamics of the object and the body of the robot itself. The reaction moment can be obtained accurately using the parallel solution scheme of inverse dynamics, which handles the dynamics...
The paper presents a new method for simulation of the cogging torque in a PM machine. The method benefits the numerical functions for modeling the magnetic system of the electrical machine. To compute the cogging torque by the numerical functions, it is necessary to model the permanent magnets and permeance of the machine. In this paper, we introduce two improved numerical functions to model them...
Over the past several decades, the control of electric machines has typically been viewed using a “black box” approach which typically involves the manipulation of voltage and current to generate desired characteristics. However, for the purpose of designing and controlling the permanent magnet synchronous motor (PMSM) efficiently, a thorough understanding of the magnetic field parameters can play...
As bearingless motors have all advantages of magnetic bearings; they play an important role in solving difficult problems of special electric drives. The simplest and most versatile form of bearingless motor is the bearingless slice rotor motor. This kind of motor with centrifugal pump has a wide range of applications in life science, chemical processing industry, semiconductor manufacturing industry,...
A basic structure of excavator anti shovel device is introduced. The digging resistance force graph of the rotating bucket is drawn, and the calculation method of digging resistance is analyzed. Besides, the calculation diagram of the theoretical digging force of the bucket arm cylinder is given, the calculation method of theoretical digging force of the working hydraulic cylinder is deduced. Then,...
Steel ladle is the important tool for containing and transiting in steel enterprises. Analysis of tilting torque steel ladle is very important for reasonable design of electric tipping mechanism of steel ladle. Based on the ANSYS, the varies of steel ladle total mass, centroid, moment of inertia, tilting torque etc. with tilting angle in steel ladle tipping process are studied. The tipping torque...
One-kilometer directional drilling rig is a head-type hydraulic rig, which can drill horizontal deep holes in coalseam with down-hole motor for gas drainage. To avoid the hole axis floating and the rig overturning, a stabilizer is designed for high stable ability in this paper. Stabilizer is subsequently modeled and simulated in four typical conditions where the drilling rod rotates. The result shows...
Magnetic flux pattern and magnetization curve of Exterior Rotor Permanent Magnet Brushless DC (ERPMBLDC) Motor are obtained using an advanced numerical method called Finite Element Method. This method better suits to deal with the complicated internal structure of the machine and non linear magnetic characteristics. Finite Element method Magnetics (FEMM) software Version 4.2 is used to simulate two...
Switched reluctance motors have drawn attention in the field of aerospace and special industrial applications. Majority of the papers are confined to radially laminated rotors. Axially laminated rotors enhance the electromagnetic torque than with radially laminated rotors. This makes it suitable for applications like gears, blowers etc .Doubly excited motors solve the energy circulation problems which...
This paper presents the optimal design of a surface mounted permanent-magnet (PM) Brushless direct-current (BLDC) motor meant for spacecraft applications. The spacecraft applications requires the choice of a motor with high torque density, minimum cogging torque, better positional stability and high torque to inertia ratio. Performance of two types of machine configurations viz Slotted PMBLDC and...
The present paper refers to some examples that use the finite element method (FEM) in the process of analysis, design and optimization of the electrical machines used in wind energy conversion systems. The 2D-FEM program Opera 13 of Vector Fields is used in the analyzed examples. These examples refer to two types of synchronous generators with permanent magnets. Some possibilities and advantages of...
The main target of this paper is optimizing the slot-opening shift for cogging torque reduction in BLDC motors. In a slot-opening shift method there is no skew, therefore the known drawbacks of the skewing is prevented. In the first part of the paper the slot-opening shift method for a BLDC motor is discussed. In this case, it is desired to find a method for cogging torque reduction without deteriorating...
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