A mathematical model based on d-q axis theory and dynamic performance characteristic of brushless Resolvers is discussed in this paper. The impact of rotor eccentricity on the accuracy of position in precise applications is investigated. In particular, the model takes the stator currents of brushless Resolver into account. The proposed model is used to compute the dynamic and steady state equivalent circuit of Resolvers. Finally, simulation results are presented. The validity and usefulness of the proposed method are thoroughly verified with experiments.

The Recent development of 2-DOF electrical machines leads to increasing need for 2-DOF position sensors. Using a planar sensor instead of two linear ones decreases the complexity, and cost of the employed drive. Therefore, in this paper a new slotless configuration is proposed for the planar Resolver, that simplifies the manufacturing of the sensor. Then, the optimal combination of the stator/mover number of coils is determined based on the proposed analytical model. Finally, to reduce the number of integrated parts of the proposed Resolver, a new configuration with skewed coils is proposed. The success of the developed model and the presented configuration is validated using three-dimensional finite element analysis.

The Recent development of 2-DOF electrical machines leads to increasing need for 2-DOF position sensors. Using a planar sensor instead of two linear ones decreases the complexity, and cost of the employed drive. Therefore, in this paper a new slotless configuration is proposed for the planar Resolver, that simplifies the manufacturing of the sensor. Then, the optimal combination of the stator/mover number of coils is determined based on the proposed analytical model. Finally, to reduce the number of integrated parts of the proposed Resolver, a new configuration with skewed coils is proposed. The success of the developed model and the presented configuration is validated using three-dimensional finite element analysis.

Multi-Speed Resolvers are desirable position sensors for high performance closed-loop control of inverter driven machines due to their high accuracy. However, developing a winding with high number of poles with limited number of slots is a main challenge in achieving multi-speed function. Therefore, in this paper different winding configuration are proposed to achieve 5-X performance of a disk type wound-rotor Resolver. Then, the best winding is chosen for experimental verification. In addition to the accuracy of the sensor, the optimal winding selection index is defined considering copper usage, number of winding layers (overlapping or non-overlapping configurations), the number of turns for each coil of the winding (variable or constant turn configurations), and the amplitude of the fundamental harmonic. An objective function is defined involving all the mentioned indices with different weights determined based on the importance of each index. Finally, a prototype of the sensor with the best winding is built and tested. The experimental measurements verify the results of the simulations that are obtained using 3-D time setting finite element analysis.

Static eccentricity (SE) is an intrinsic fault existing in both faulty and newly made Resolvers. The late diagnosis of SE causes severe damages to mechanical parts of Resolver such as bearings, cores, and even windings, in addition to wrong position estimation. However, so far, fault diagnosis has not been investigated for any Resolver. In this paper, SE fault diagnosis is discussed for a sample wound-rotor (WR) cylindrical Resolver. Time stepping finite element method (TSFEM) is used to simulate the Resolver, and its accuracy is validated by a comparison between the results of simulation and experimental tests. Then, some fault indices are defined to diagnose the SE fault occurrence, and its magnitude is predicted using Fast Fourier transform (FFT). Finally, to ensure that indices are unique, the performance of the studied Resolver is evaluated under other types of faults including Dynamic Eccentricity (DE) and Short-circuit (SC) that may excite the same indices.

Conflict Resolution is an important procedure in many intelligent systems such as rule-based systems. This procedure determines the sequence of firing rules when more than one rule can fire. This paper presents an Intelligent Decision Support System wherein when a conflict occurs; it follows distinct reasoning line for each incompatible rule, and informs the decision maker about all possible options. This idea is applied in a system which is implemented for the purpose of assisting a player in a Real-Time Strategic Game. Obtained results indicate that player with help from this intelligent assistant can have better achievements over other players.

Because of temperature independence, high resolution and noiseless outputs, brushless Resolvers are widely used in high precision control systems. In this paper, at first dynamic performance characteristics of brushless Resolver, considering parameters identification are presented. Then a mathematical model based on d-q axis theory is given. This model c.anbe used for studying the dynamic behavior of the Resolver and steady state model is obtained by using dynamic model. The main object of this paper is to present an approach to identify electrical and mechanical parameters of a brushless Resolver based on DC charge excitation and weight, pulley and belt method, respectively. Finally, the model of Resolver based on the obtained parameters is simulated. Experimental results approve the validity of proposed method.

Disk Type Variable Reluctance (DTVR) Resolvers have distinguished performance under run out fault comparing to conventional sinusoidal rotor Resolvers. However, their accuracy under inclined rotor fault along with different types of eccentricities includes static and dynamic eccentricities are questioned. Furthermore, due to thin copper wires that are used for signal and excitation coils of Resolver there is high risk of short circuit fault in the coils. So, in this study the performance of the sinusoidal rotor DTVR Resolver under the mentioned faults are studied. The quality of output voltages along with position error of the sensor is discussed. 3-D time stepping finite element method is used to show the effect of different faults. Finally, the prototype of the studied Resolver is constructed and tested. The employed test bed is built in such a way that is able to apply controllable level of different mechanical faults. Good agreement is obtained between the finite element and the experimental results, validating the success of the presented analysis.

Resolvers are widely used in electric driven systems especially in high precision servomechanisms. Both encapsulated and pancake Resolvers suffer from a major drawback: static eccentricity (SE). This drawback causes a significant increase in Resolver output position error (RPE) which could not be corrected electronically. To reduce RPE, this paper proposes a novel structure with axial flux. Proposed topology, design guidelines, optimization procedure and several key features to improve the sensitivity of axial flux Resolver (AFR) against SE are studied. Furthermore, to minimize RPE an optimized design is attained. The machines are investigated in detail by using d-q model and 3D time stepping finite-element analysis. The results of theses two methods are compared and both prototype machines (proposed and optimized) are built. In order to evaluate proposed topologies, an experimental test setup is devised. Finally, the experimental results of the prototype machines verified the analysis results.

Nowadays, Variable Reluctance (VR) Resolvers, due to their simple structure, compact design and thermal stability, are widely used in marine navigation systems for detecting the angular position. However, they suffer from some disadvantages such as winding complexity and being highly influenced by eccentricity fault. In this paper, after studying the challenges, a new structure with simple winding is studied to overcome the challenges. To show the preference of the new design, its performance is analyzed using 3-D time stepping finite element method and then compared with conventional variable reluctance Resolver. The comparison shows peak to peak position error of the new Resolver under 35μm static eccentricity (based on ABEC492 standard) is improved more than 13 Arc Min. with respect to the conventional Resolver. Finally, the prototype of the new Resolver is built and tested. Experimental results confirm the success of the new Resolver.