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The main objective of this paper is to develop a linear actuator for an accurate position control with a high force-to-mass ratio. A novel configuration is developed that has a double-sided NdFeB stator and a printed-circuit moving armature. A design methodology is presented, which is based upon the finite-element method magnetic-circuit analysis, and a simulation software for performance predictions...
New applications, like electrical power generation, present new challenges in designing induction machines due to specific operation conditions. Wind generation demands the machine for operating doubly fed, requiring an electrical installation based on long cable lengths connecting the converter to the generator. What results in rotor and stator circuits operate under high voltage with high gradients...
This paper gives the design and simulation of a permanent magnet synchronous motor (PMSM) for a super-high speed centrifugal compressor drive application. The PMSM has an output power of 2000 W at 200,000 rpm with 28 V dc power supply. It is designed for operation at a cryogenic temperature of 77 K. The designed PMSM is a 2-pole, 3-phase slotless structure. The permanent magnet is centrally located...
This paper presents an active vibration compensation with piezoelectric actuators for switched reluctance motors. In order to verify results given by finite element analysis, an experimental structure is presented. This structure is called "basic" because it has no moving part, and then allows easier experimental work. The structural behaviour of this structure is presented, and we show...
Rotor resistance variation due to changing rotor temperature is a significant issue in the design of induction motor controls. In this work, a new on-line rotor resistance estimator is proposed based on an alternate qd induction machine model which simultaneously includes stator leakage saturation, rotor leakage saturation, magnetizing path saturation, and distributed circuit effects in the rotor...
This paper discusses the design of a fault tolerant electric motor for an aircraft main engine fuel pump. The motor in question is a four phase fault tolerant motor with separated windings and a six pole permanent magnet rotor. Methods of reducing machine losses in both the rotor and stator are introduced and discussed. The methods used to calculate rotor eddy current losses are examined. 3D finite...
Open-loop speed estimators (OLSE) and closed loop speed estimators (observers) based on flux estimation are usually inaccurate since they depend on ill-known induction machine (IM) parameters such as stator winding resistance. This paper presents two methods to track accurately the IM synchronous speed over a large speed range with OLSE. An accurate adaptive integration algorithm (AAIA) developed...
This paper re-explores first-principles machine design by implementing continuum electromechanical models with Mathematica symbolic software. It is shown that the algebraic complexities previously impeding the application of the theory to many-layered structures are removed using this software. A double-stator linear induction motor (LIM) is used to verify the model's accuracy in predicting force...
In this paper, various key points in the rotor design of a low cost permanent magnet assisted synchronous reluctance motor (PMa-SynRM) are introduced and their effects are studied. Finite element approach has been utilized to show the effects of these parameters on the developed average electromagnetic torque and total d-q inductances. One of the features considered in the design of this motor is...
In this paper we show a novel motor design method, considering stress distribution in the motor core. This method consists of several steps as follows: (a) measurement of magnetic characteristics of the electrical steel sheets in the state where the stress is added, (b) calculation of deformation and stress distribution using structural analysis, (c) pre-process of the magnetic field analysis, which...
In this paper, new stator pole tip geometry has been investigated. The new stator pole tip and conventional stator pole tip SRM are analyzed using finite element analysis (FEA). It is observed that a small change in stator pole tip geometry results in a significant change in the characteristics of motor. The new stator pole tip results in more flux linkages and hence more saturation of motor at same...
Linear switched reluctance motor (LSRMs) for primary propulsion of a ship elevator is proposed and investigated in this paper. To achieve the stated objective, a new type of LSRM is proposed with twin stators and a translator between them with no back iron in the translator. The proposed configuration of the LSRM is designed, simulated and analyzed and compared to traditional LSRMs. The number of...
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