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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...
Flywheel energy storage system is a promising technology of high power storage and energy conversion for Hybrid Electric Vehicles (HEVs) and Electric Vehicles (EVs). As the safety issue is one of the top priorities of this technology, especially when the Active Magnetic Bearing (AMB) is utilized, a sensor-fault tolerant control method of AMB is proposed in this paper. In the method, specially designed...
This paper presents a proof of concept of a variable stiffness actuator (VSA) that uses only one (high power) input motor. In general, VSAs use two (high power) motors to be able to control both the output position and the output stiffness, which possibly results in a heavy, and bulky system. In this work, two small and light-weight clutches are used to lock either one of the degrees of freedom, allowing...
Rotor is one of the core component in flux switching machine (FSM) that wield mechanical stress. It is very important to identify the maximum tensile strength of the rotor. Beyond the maximum tensile strength, the rotor will deform or crack. In the research, stress analysis for the tensile strength is measured through principal stress. The stress analysis is conducted to analyze the principal stress...
This paper presents a novel method to generate surface dynamometer cards of a sucker rod pump by applying torque and rotational speed estimates of a variable speed induction motor drive and a pumping process identification run.
The hybrid system approach is used to minimize losses in the AMB system by switching controllers and bias current. The method is validated with experimental results at steady state and rotating system. With high bias orbits of the rotor are reduced while in the absence of disturbance the losses are minimized with low bias. The switching rules based on inner variables of the control system are proposed.
This paper presents efficiency improvement of switched reluctance motors (SRMs) by stepped-skewing rotor (SSR). The cross sectional configuration of the SRM tested including size and shape of salient poles is almost same as those of a conventional SRM. The tested SRM is divided into 3 stacks, and only rotor is skewed. The skew angle has been designed to reduce both of torque ripple and radial force...
The original application of large object pushing with an Unmanned Aerial Vehicle platform is the subject of this paper. The utilization of an unmanned Tri-TiltRotor is proposed for this application, innovatively employing its direct longitudinal actuation capabilities to attain a large force exertion-capable aerial platform. Via the longitudinal tilting of the aerial vehicle's main rotors, the forward-projected...
This paper presents magnetic levitation test results of the time-divided torque and suspension force control type bearingless motor. The motor structure, principle of the torque and suspension force and control strategy have been conducted. The torque and suspension force have been simulated by Finite Element Analysis (FEA) using a machine model. As a result, it is estimated that the rotor shaft is...
The purpose of this paper is to present a study on the power quality issue based on the harmonics present in the slots of induction motor due to broken bar fault in induction motors. This paper presents numerical magnetic field analysis of squirrel cage induction motor based on finite element method. Finite element analysis can be used for predicting the performance of an induction motor having different...
This paper presents a new decoupling control strategy for a 12/8 bearingless switched reluctance motor (BSRM) with improved mathematical model. Firstly, the improved mathematical model is built by Maxwell stress tensor method selecting one-forth arc integration path of the fringing magnetic field. Then, a new decoupling control strategy is described. The average torque and radial force of the scheme...
This paper presents a method of optimizing number of turns of the main and radial force winding for a bearingless switched reluctance motor (BSRM) with 12/8 teeth configuration based on its mathematical model. The radial force and torque of BSRM are analyzed on condition of different combinations of the magnetomotive force of two kinds of windings. The winding configuration has a strongly influence...
Vibration is a serious problem in switched reluctance motors (SRMs) for its unbalanced radial force distribution on the rotor during the rotation. The paper analyzes the principle of radial force generation with radial force winding short-circuited in bearingless switched reluctance motors (BSRMs). The short-circuited radial force winding can be operated as a damping winding. A short-circuited control...
Optimum design of switched reluctance motor (SRM) and it control circuits require a knowledge of its parameters, Such as inductance, flux linkage and Torque. In this paper, a model of SRM has been developed and analysed with ANSYS Workbench. The variation of Inductance, flux density and directional force with respect to rotor position for two different stator pole shapes has been analysed. It is observed...
In this paper, we propose a new dynamical model of a spherical multi-degree-of-freedom (DOF) ultrasonic motor (USM) and its fundamental control method based on nonholonomic mechanics. This system is analogous to the so-called rolling sphere manipulation system as far as the kinematics is concerned, but there is also an indispensable influence of the momentum dynamics. We propose multi-cycle phase...
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