Showing papers on "Induction motor published in 2005"
TL;DR: In this article, a comprehensive review of various stator faults, their causes, detection parameters/techniques, and latest trends in the condition monitoring technology is presented. And a broad perspective on the status of stator fault monitoring to researchers and application engineers using induction motors is provided.
Abstract: Condition monitoring of induction motors is a fast emerging technology for online detection of incipient faults. It avoids unexpected failure of a critical system. Approximately 30-40% of faults of induction motors are stator faults. This work presents a comprehensive review of various stator faults, their causes, detection parameters/techniques, and latest trends in the condition monitoring technology. It is aimed at providing a broad perspective on the status of stator fault monitoring to researchers and application engineers using induction motors. A list of 183 research publications on the subject is appended for quick reference.
541 citations
TL;DR: In this paper, the authors present a review of thermal design issues in electric motors and give advice on how to deal with them when developing algorithms for inclusion in design software, and highlight a number of thermal issues that are difficult to analyze.
Abstract: With the ever-increasing pressure on electric motor manufacturers to develop smaller and more efficient electric motors, there is a need for more thermal analysis in parallel with the traditional electromagnetic design. Attention to the thermal design can be rewarded by major improvements in the overall performance. Technical papers published to date highlight a number of thermal design issues that are difficult to analyze. This paper reviews some of these issues and gives advice on how to deal with them when developing algorithms for inclusion in design software.
499 citations
Book•
11 Apr 2005
TL;DR: This chapter discusses the construction of AC Machines, the physics of the DC Motor, and the properties of magnetic fields and materials.
Abstract: PART I: DC MACHINES, CONTROLS AND MAGNETICS. 1. The Physics of the DC Motor. 2.Feedback Control. 3. Magnetic Fields and Materials. PART II: AC MACHINE THEORY. 4. Rotating Magnetic Fields. 5. The Physics of AC Machines. 6. Mathematical Models of AC Machines. 7. Symmetric Balanced Three-Phase AC Machines. 8. Induction Motor Control. 9. PM Synchronous Motor Control. 10. Trapezoidal Back-Emf PM Synchronous Motors (BLDC). Appendix: Trigonometric Table and Identities. References. Index.
465 citations
TL;DR: In this article, a five-phase brushless permanent magnet motor with concentrated windings has been proposed, where the produced back electromotive force is almost trapezoidal and the motor is supplied with the combined sinusoidal plus third harmonic of currents.
Abstract: A five-phase brushless permanent-magnet (PM) motor is introduced. The proposed motor has concentrated windings such that the produced back electromotive force is almost trapezoidal. The motor is supplied with the combined sinusoidal plus third harmonic of currents. This motor, while generating the same average torque as an equivalent PM brushless dc motor (BLDC), overcomes its disadvantages. The motor equations are obtained in the d/sub 1/q/sub 1/d/sub 3/q/sub 3/0 rotating reference frame. Therefore, the so-called vector control is easily applicable to this kind of motors and the motor has the same controllability as a PM synchronous motor (PMSM). For presenting the superior performance of the proposed five-phase motor, its three and five-phase PMSM and BLDC counterparts are also analyzed. Finite element method is used for studying the flux density and calculating the developed static torque. Also, the developed torque is obtained using the mathematical model in the d-q reference frame. The average torque and the torque ripple for all cases are calculated and compared. Experimental results are in good agreement with the simulation results.
428 citations
25 May 2005
TL;DR: In this paper, the authors present a power management and distribution system for hybrid electric vehicles based on a brushless DC motor driven by electric motors and brushless brushless electric motors.
Abstract: AUTOMOTIVE POWER SYSTEMS Conventional Cars Roberto Giral-Castillon, Luis Martinez-Salamero, and Javier Maixe-Altes Hybrid Electric Vehicles John M. Miller Hybrid Drivetrains M. Ehsani and Yimin Gao Electric Vehicles Ramesh C. Bansal Optimal Power Management and Distribution in Automotive Systems Zheng John Shen, X. Chen, A. Masrur, V.K. Garg, and A. Soltis AUTOMOTIVE SEMICONDUCTOR DEVICES, COMPONENTS, AND SENSORS Automotive Power Semiconductor Devices Zheng John Shen Ultracapacitors John M. Miller Flywheels John M. Miller ESD Protection for Automotive Electronics Albert Z.H. Wang Sensors Mario Manana Canteli AUTOMOTIVE POWER ELECTRONIC CONVERTERS DC-DC Converters James P. Johnson AC-DC Rectifiers Byoung-Kuk Lee and Chung-Yean Won Unbalanced Operation of Three-Phase Boost Type Rectifiers Ana V. Stankovic DC/AC Inverters Mohan Aware AC/AC Converters Mehrdad Kazerani Power Electronics and Control for Hybrid and Fuel Cell Vehicles Kaushik Rajashekara AUTOMOTIVE MOTOR DRIVES Brushed-DC Electric Machinery for Automotive Applications Babak Fahimi Induction Motor Drives Khaled Nigim DSP-Based Implementation of Vector Control of Induction Motor Drives Hossein Salehfar Switched Reluctance Motor Drives Babak Fahimi and Chris Edrington Noise and Vibration in SRMs William Cai and Pragasen Pillay Modeling and Parameter Identification of Electric Machines Ali Keyhani, Wenzhe Lu, and Bogdan Proca Brushless DC Drives James P. Johnson Testing of Electric Motors and Controllers for Electric and Hybrid Electric Vehicles Sung Chul Oh OTHER AUTOMOTIVE APPLICATIONS Integrated Starter Alternator William Cai Fault Tolerant Adjustable Speed Motor Drives for Automotive Applications Babak Fahimi Automotive Steering Systems Tomy Sebastian, Mohammad S. Islam, and Sayeed Mir Current Intensive Motor Drives: A New Challenge for Modern Vehicular Technology Babak Fahimi Power Electronics Applications in Vehicle and Passenger Safety D.M.G. Preethichandra and Saman Kumara Halgamuge Drive and Control System for Hybrid Electric Vehicles Weng Keong Kevin Lim, Saman Kumara Halgamuge, and Harry Charles Watson Battery Technology for Automotive Applications Dell A. Crouch INDEX
290 citations
TL;DR: In this paper, the authors studied the feasibility of fault detection and diagnosis in a three-phase inverter feeding an induction motor using a sensor-based technique using the mains current measurement.
Abstract: The aim of this paper is to study the feasibility of fault detection and diagnosis in a three-phase inverter feeding an induction motor. The proposed approach is a sensor-based technique using the mains current measurement. A localization domain made with seven patterns is built with the stator Concordia mean current vector. One is dedicated to the healthy domain and the last six are to each inverter switch. A probabilistic approach for the definition of the boundaries increases the robustness of the method against the uncertainties due to measurements and to the PWM. In high-power equipment where it is crucial to detect and diagnose the inverter faulty switch, a simple algorithm compares the patterns and generates a Boolean indicating the faulty device. In low-power applications (less than 1 kW) where only fault detection is required, a radial basis function (RBF) evolving architecture neural network is used to build the healthy operation area. Simulated experimental results on 0.3- and 1.5-kW induction motor drives show the feasibility of the proposed approach.
228 citations
24 Oct 2005
TL;DR: In this article, the authors determine some IPM rotor design criteria so as to improve the sensorless rotor position detection, which can be used to determine a proper design of the IPM motor geometry, even under heavy operating conditions.
Abstract: The sensorless control technique based on the superimposition of a high-frequency rotating voltage vector is commonly used to detect the rotor position of a synchronous interior permanent magnet (IPM) motor. This technique is effective at zero and low motor speed, where back E.M.F. is null or extremely low. Then the accuracy of the rotor position detection depends strictly on the rotor saliency, that is, on the geometry of the IPM rotor. The aim of this paper is to determine some IPM rotor design criteria so as to improve the sensorless rotor position detection. Since the design has to be effective in different operating conditions, both saturation and cross-coupling effects have to be taken into account. It is found that the effectiveness of the sensorless rotor position detection can be improved by means of a proper design of the IPM motor geometry, even under heavy operating conditions.
215 citations
TL;DR: The proposed inverter drive scheme is capable of producing a multilevel pulsewidth-modulation (PWM) waveform for the phase voltage ranging from a two- level waveform to a six-level waveform depending on the modulation range.
Abstract: In this paper, a multilevel inverter system for an open-end winding induction motor drive is described. Multilevel inversion is achieved by feeding an open-end winding induction motor with two two-level inverters in cascade (equivalent to a three-level inverter) from one end and a single two-level inverter from the other end of the motor. The combined inverter system with open-end winding induction motor produces voltage space-vector locations identical to a six-level inverter. A total of 512 space-vector combinations are available in the proposed scheme, distributed over 91 space-vector locations. The proposed inverter drive scheme is capable of producing a multilevel pulsewidth-modulation (PWM) waveform for the phase voltage ranging from a two-level waveform to a six-level waveform depending on the modulation range. A space-vector PWM scheme for the proposed drive is implemented using a 1.5-kW induction motor with open-end winding structure.
188 citations
08 Jul 2005
TL;DR: In this paper, a frame size 180 brushless doubly fed (induction) machine with four rotor designs was used as a variable speed generator and a per phase equivalent circuit was developed and a method of obtaining parameters for the circuit was described.
Abstract: Experimental results from a frame size 180 brushless doubly fed (induction) machine (BDFM) fitted with four rotor designs are presented. The machine is intended for use as a variable speed generator, or drive. A per phase equivalent circuit for the machine has been developed and a method of obtaining parameters for the circuit is described. Expressions for the torque as a function of speed have been derived and predictions of machine performance in both self-cascaded and synchronous (doubly fed) modes have been verified experimentally. The work illustrates the link between rotor equivalent circuit parameters and machine performance and a comparison between rotor designs has been made.
172 citations
Book•
01 Jan 2005
TL;DR: In this paper, the authors present a simulation of a Mechatronic System using state-space representation of a linear graph with a series of state-of-the-art digital transducers.
Abstract: Table of MECHATRONIC ENGINEERING Mechatronic Systems Study of Mechatronics References and Further Reading DYNAMIC MODELS AND ANALOGIES Terminology Analogies State-Space Representation Model Linearization Linear Graphs State Models From Linear Graphs Electrical Systems Fluid Systems Thermal Systems Bond Graphs Transfer-Function Models Frequency Domain Models Response Analysis And Simulation MECHANICAL COMPONENTS AND ROBOTIC MANIPULATORS Mechanical Components Transmission Components Robotic Manipulators Robotic Grippers COMPONENT INTERCONNECTION AND SIGNAL CONDITIONING Component Interconnection Impedance Characteristics Amplifiers Analog Filters Modulators and Demodulators Analog-Digital Conversion Bridge Circuits Linearizing Devices Miscellaneous Signal Modification Circuitry Signal Analyzers And Display Devices PERFORMANCE SPECIFICATION AND ANALYSIS Parameters For Performance Specification Linearity Instrument Ratings Bandwidth Design Instrument Error Analysis Statistical Process Control ANALOG SENSORS AND TRANSDUCERS Terminology Motion Transducers Variable-Inductance Transducers Permanent-Magnet Transducers Variable-Capacitance Transducers Piezoelectric Sensors Effort Sensors Strain Gages Torque Sensors Tactile Sensing Gyroscopic Sensors Optical Sensors and Lasers Ultrasonic Sensors Thermo-Fluid Sensors Other Types of Sensors DIGITAL TRANSDUCERS Advantages Of Digital Transducers Shaft Encoders Incremental Optical Encoders Absolute Optical Encoders Encoder Error Miscellaneous Digital Transducers STEPPER MOTORS Principle of Operation Stepper Motor Classification Driver And Controller Torque Motion Characteristics Damping of Stepper Motors Stepping Motor Models Control of Stepper Motors Stepper Motor Selection and Applications CONTINUOUS-DRIVE ACTUATORS DC Motors DC Motor Equations Control of DC Motors Motor Driver DC Motor Selection Induction Motors Induction Motor Control Synchronous Motors Linear Actuators Hydraulic Actuators Hydraulic Control Systems Fluidics DIGITAL LOGIC AND HARDWARE Number Systems and Codes Logic and Boolean Algebra Combinational Logic Circuits Sequential Logic Devices MICROPROCESSORS AND PLCS Digital Computer Programmable Logic Controllers Data Acquisition And Control CONTROL SYSTEMS Control Engineering Control System Performance Control Schemes Stability and Routh-Hurwitz Criterion Root Locus Method Frequency Domain Analysis Controller Design and Tuning Compensator Design in the Frequency Domain Controller Tuning Design Using Root Locus Digital Control CASE STUDIES IN MECHATRONICS Design of a Mechatronic System Robotics Case Study Iron Butcher Case Study Projects Appendix A. Transform Techniques Laplace Transform Response Analysis Transfer Function Fourier Transform The S-Plane Appendix B. Software Tools SIMULINKO STATEFLOW MATLABO Control Systems Toolbox LabVIEWO Index
168 citations
TL;DR: In this article, a new concept based on an analysis of transient machine currents is introduced to detect broken rotor bars in induction machines operating as a motor and a generator using wavelet analysis.
Abstract: Previous work on condition monitoring of induction machines has focused on steady-state speed operation. Here, a new concept is introduced based on an analysis of transient machine currents. The technique centers around the extraction and removal of the fundamental component of the current and analyzing the residual current using wavelets. Test results of induction machines operating both as a motor and a generator shows the ability of the algorithm to detect broken rotor bars.
TL;DR: In this paper, the authors proposed the use of the multiple reference frames theory for the diagnosis of stator faults in three-phase induction motors, and the simulation and experimental results demonstrate its independence in relation to the working conditions of the motor, such as the load level and unbalances in the voltage supply system.
Abstract: This paper proposes the use of the multiple reference frames theory for the diagnosis of stator faults in three-phase induction motors. The development of a simplified mathematical motor model allowed the establishment of the equivalent circuits of the motor, in d-q-0 axes, in the presence of stator interturn short circuits. The use of the stationary reference frame, clockwise and counterclockwise synchronous reference frames, allows the extraction and manipulation of the information contained in the motor supply currents in a way that the effects introduced by the fault are easily isolated and measured. A severity factor is defined and the simulation and experimental results presented demonstrate its independence in relation to the working conditions of the motor, such as the load level and unbalances in the voltage supply system. Although the technique is here introduced for the diagnosis of stator faults, it is possible to extend its use for the diagnosis of other asymmetries such as broken rotor bars and air-gap eccentricity.
TL;DR: In this paper, two orthogonal axis models for simulation of three-phase induction motors with asymmetrical windings and inter-turn short circuits on the stator are presented.
TL;DR: MATLAB/Simulink implementation of three induction motor tests, namely dc, no-load, and blocked-rotor tests performed to identify equivalent circuit parameters are described to support and enhance electric machinery education at the undergraduate level.
Abstract: This work describes MATLAB/Simulink implementation of three induction motor tests, namely dc, no-load, and blocked-rotor tests performed to identify equivalent circuit parameters. These simulation models are developed to support and enhance electric machinery education at the undergraduate level. The proposed tests have been successfully integrated into electric machinery courses at Drexel University, Philadelphia, PA, and Nigde University, Nigde, Turkey.
TL;DR: In this article, the stator current of a three-phase squirrel-cage induction machine is analyzed theoretically and experimentally in order to show how it is influenced by electrical rotor faults.
Abstract: The aim of this paper is to analyze theoretically and experimentally the stator current of a three-phase squirrel-cage induction machine in order to show how it is influenced by electrical rotor faults. The approach used for this study analyzes the modification introduced by n broken rotor bars in the rotor cage magnetomotive force and then estimates the resulting frequency spectrum in the stator current. This approach is validated in a 3-kW 230-V/400-V 50-Hz 2850-r/min two-pole three-phase induction machine, showing the sensitive frequency components to rotor fault condition.
TL;DR: In this article, the authors proposed a novel control strategy and a protection circuit and showed the advantage of utilizing a newly developed reverse blocking insulated gate bipolar transistor (RB-IGBT) to solve several practical problems of the matrix converter.
Abstract: This paper proposes a novel control strategy and a protection circuit and shows the advantage of utilizing a newly developed reverse blocking insulated gate bipolar transistor (RB-IGBT), to solve several practical problems of the matrix converter. The proposed control strategy is based on a virtual indirect control method with a virtual rectifier and a virtual inverter. Pulse-width modulated (PWM) pulses for the matrix converter are obtained by combining PWM pulses for the virtual rectifier and inverter. As a result, the control part of the input current and output voltage can be clearly separated. Thus, the conventional inverter control algorithms can be applied to the virtual inverter control. The advantage of this method is confirmed by experimental results with a 22-kW induction motor drive system. Good sinusoidal waveforms are obtained for the input and output currents, and the total harmonic distortion (THD) of the input and output current are 5.1% and 1.4%, respectively. The conduction loss of the RB-IGBT is decreased to about two-thirds of the conventional ac switch with series connection diode. Thus, the converter loss is about a half to the conventional PWM rectifier-inverter system with the same capacity. Furthermore, the protection problem is solved by a dynamic clamp method without an electrolytic capacitor. This protection circuit directly dissipates reactive load energy by dynamic clamp operation of an IGBT.
TL;DR: In this paper, the authors present the results of an experimental study of the detection of mechanical faults in an induction motor by means of analysis of combinations of permeance and magneto-motive force (MMF) harmonics.
Abstract: This paper presents the results of an experimental study of the detection of mechanical faults in an induction motor. As is reasonably well known, by means of analysis of combinations of permeance and magneto-motive force (MMF) harmonics, it is possible to predict the frequency of air gap flux density harmonics which occur as a result of certain irregularities in an induction motor. In turn, analysis of flux density harmonics allows the prediction of induced voltages and currents in the stator windings. Reviewing this theory, equations which may aid in the identification of mechanical faults are presented. These equations include both those which indicate eccentric conditions and those which have been suggested to help identify bearing faults. The development of test facility to create eccentricity faults and bearing fault conditions is described. This test facility allows rapid access to the motor bearings, allowing an investigation into the ability to detect faulted bearing conditions using stator current monitoring. Experimental test results are presented, indicating that it may be possible to detect bearing degradation using relatively simple and inexpensive equipment.
TL;DR: In this article, a mixed approach based on experimental measurements and on the modeling of the complete common mode (CM) circuit was used to predict common mode perturbations and compared with experiments in a variable speed drive system.
Abstract: In this paper, common mode (CM) conducted perturbations are predicted and compared with experiments in a variable-speed drive system, thanks to a mixed approach based on experimental measurements and on the modeling of the complete CM circuit. Its different parts are considered and represented by a chain of quadripolar matrices: the inverter, the cables, and the induction motor. At last, it is shown that the parasitic currents in the system can be calculated in the different stages of the matrix chain. Experiments have successfully confirmed this approach.
TL;DR: This paper presents a new model reference adaptive system (MRAS) speed observer for high-performance field-oriented control induction motor drives based on adaptive linear neural networks using the current model as an adaptive model discretized with the modified Euler integration method.
Abstract: This paper presents a new model reference adaptive system (MRAS) speed observer for high-performance field-oriented control induction motor drives based on adaptive linear neural networks. It is an evolution and an improvement of an MRAS observer presented in the literature. This new MRAS speed observer uses the current model as an adaptive model discretized with the modified Euler integration method. A linear neural network has been then designed and trained online by means of an ordinary least-squares (OLS) algorithm, differently from that in the literature which employs a nonlinear backpropagation network (BPN) algorithm. Moreover, the neural adaptive model is employed here in prediction mode, and not in simulation mode, as is usually the case in the literature, with a consequent quicker convergence of the speed estimation, no need of filtering the estimated speed, higher bandwidth of the speed loop, lower estimation errors both in transient and steady-state operation, better behavior in zero-speed operation at no load, and stable behavior in field weakening. A theoretical analysis of some stability issues of the proposed observer has also been developed. The OLS MRAS observer has been verified in numerical simulation and experimentally, and in comparison with the BPN MRAS one presented in the literature.
TL;DR: In this article, two architectures of artificial neural networks (ANNs) are developed and used to correct the performance of sensorless nonlinear control of induction motor systems, which is based on the use of ANN to get an appropriate correction for improving the estimated speed.
Abstract: In this paper, two architectures of artificial neural networks (ANNs) are developed and used to correct the performance of sensorless nonlinear control of induction motor systems. Feedforward multilayer perception, an Elman recurrent ANN, and a two-layer feedforward ANN is used in the control process. The method is based on the use of ANN to get an appropriate correction for improving the estimated speed. Simulation and experimental results were carried out for the proposed control system. An induction motor fed by voltage source inverter was used in the experimental system. A digital signal processor and field-programmable gate arrays were used to implement the control algorithm.
15 May 2005
TL;DR: In this paper, the authors present some design considerations of fault-tolerant synchronous motors, characterized by a fractional number of slots per pole per phase, including double-layer and single-layer winding.
Abstract: This paper presents some design considerations of fault-tolerant synchronous motors, characterized by a fractional number of slots per pole per phase. The first advantage of this configuration is a smooth torque, because of the elimination of the periodicity between slots and poles. The second one is a higher fault-tolerant capability making the machine able to work even in faulty conditions. However, the fractional-slot configuration presents a high contents of M.M.F. harmonics that may cause an unbalanced saturation and thus an unbearable torque ripple. A method to design fractional-slot motors is illustrated in the paper, including double-layer and single-layer winding. The analytical computation is extended to determine the harmonics of M.M.F. distribution. Their effect is highlighted in isotropic as well as anisotropic motors. Finally some considerations are reported to avoid unsuitable configurations
16 Jun 2005
TL;DR: In this article, a passive EMI filter is proposed to eliminate bearing current and ground leakage current from an inverter-driven motor rated at 400 V and 3.7 kW.
Abstract: This paper presents a practical approach to eliminating both bearing current and ground leakage current from an inverter-driven motor rated at 400 V and 3.7 kW. When the shaft voltage with respect to the motor frame exceeds the dielectric breakdown voltage of thin lubricating grease films in two metal bearings at the drive and non-drive ends, an electrical discharge machining (EDM) current flows through the bearings. A passive EMI filter can keep the shaft voltage in check, as a result of having eliminated high-frequency common-mode voltage from the motor terminals. Hence, no dielectric breakdown occurs in the grease films, so that no EDM current flows in the bearings. Experimental results verify the viability and effectiveness of the passive EMI filter designed in this paper
24 Oct 2005
TL;DR: In this paper, the authors investigate and compare the torque behavior of induction motors and transverse laminated synchronous reluctance motors and show that the synchronous motor can give from 10% to 25% more torque than the corresponding induction motor, depending on motor size and importance of I.M rotor losses.
Abstract: The aim of this paper is to investigate and compare the torque behavior of induction motors and transverse laminated synchronous reluctance motors. Each induction motor is compared with a synchronous reluctance motor, that has the same stator lamination and winding but, obviously, different rotor. The thermal analysis has been based on a fully experimental approach and the results have shown that the synchronous reluctance motor can give from 10% to 25% more torque than the corresponding induction motor, depending on motor size and importance of I.M. rotor losses. The torque comparison of the two motor types has been made at equal, measured winding temperature. In addition, the difference in power factor and efficiency is also pointed out.
TL;DR: In this article, a transient analysis of a self-excited induction generator (SEIG) with electronic load controller (ELC) used in stand-alone micro-hydro power generation employing uncontrolled turbines is presented.
Abstract: This paper presents a transient analysis of a self-excited induction generator (SEIG) with electronic load controller (ELC) used in stand-alone micro-hydro power generation employing uncontrolled turbines. In view of the need to feed both dynamic [three-phase induction motor (IM)] and static loads from such systems, the transient behavior due to switching in of such loads is of interest and is carried out here. A composite mathematical model of the total system has been developed by combining the modeling of prime mover, SEIG, ELC, and load. Simulated results are compared with the experimental ones, obtained on a developed prototype of an SEIG-ELC system for the starting of an IM and switching in a resistive load. For the starting of an IM, a star/delta starter is used to avoid inrush current. Harmonic analysis is carried out to find total harmonic distortion of the terminal voltage and current to assess its power quality.
TL;DR: In this article, the authors proposed a new fault detection methodology for broken rotor bar detection and diagnostics in terms of its multiple signature processing feature and the motor operation partitioning concept to improve the overall detection performance.
Abstract: The existence of broken rotor bars in induction motors can be detected by monitoring any abnormality of the spectrum amplitudes at certain frequencies in the motor current spectrum. It has been shown that these broken rotor bar-specific frequencies are settled around the fundamental stator current frequency and are termed lower and upper sideband components. Broken rotor bar fault detection schemes should depend on multiple signatures in order to overcome or reduce the effect of any misinterpretation of the signatures that are obscured by factors such as measurement noises and different load conditions. Multiple discriminant analysis (MDA) provides an appropriate environment to develop such fault detection schemes because of its multi-input processing capabilities. The focus of this paper is to provide a new fault detection methodology for broken rotor bar fault detection and diagnostics in terms of its multiple signature processing feature and the motor operation partitioning concept to improve the overall detection performance. This paper describes two fault detection schemes within this methodology, and demonstrates that multiple signature processing is more efficient than single signature processing. The first scheme, which will be named the "monolith scheme," is based on a single large-scale MDA unit representing the complete operating load torque region of the motor, while the second scheme, which will be named the "partition scheme," consists of many small-scale MDA units, each unit representing a particular load torque operating region.
Book•
01 Jan 2005
TL;DR: The power factor applications of Induction Motors Power Electronic Drivers Adjustable-Speed Drives and Applications and Economics of Energy-Efficient Motors and Systems Utility Interface Issues.
Abstract: Induction Motor Characteristics Energy-Efficient Motors Electric Power Costs The Power Factor Applications of Induction Motors Power Electronic Drivers Adjustable-Speed Drives and Applications Adjustable-Speed Induction Motor Drives Switched Reluctance Motor Drives Permanent Magnet and Brush-Less DC Motor Drives Economics of Energy-Efficient Motors and Systems Utility Interface Issues Selected Readings Index
16 May 2005
TL;DR: In this paper, a model for coupling electromagnetic and thermal phenomena in an induction motor is presented, where the thermal analysis is done using an equivalent thermal network whose losses are determined from a complex finite element analysis of the magnetic field.
Abstract: The paper presents a model for coupling electromagnetic and thermal phenomena in an induction motor. The thermal analysis is done using an equivalent thermal network whose losses are determined from a complex finite element analysis of the magnetic field. The electromagnetic model includes both saturation and space harmonics. To show the validity of the proposed method, a test bench is realized so predicted and measured temperatures are compared.
01 Jan 2005
TL;DR: The permanent magnet machines are considered to be the best solution for applications in which the surface speed of the rotor remains below 250 m/s, and for very large speeds and powers, a solid-rotor induction motor is preferred.
Abstract: Solid-rotor induction motors are mechanically very robust and therefore potential candidates for highspeed electric drives. Permanent magnet machines offer better electromagnetic characteristics. These two types of machine are compared for high-speed applications. Electromagnetic, thermal and mechanical aspects are discussed. The permanent magnet machines are considered to be the best solution for applications in which the surface speed of the rotor remains below 250 m/s. For very large speeds and powers, a solid-rotor induction motor is preferred
TL;DR: This paper deals with the design of a 1-kW permanent-magnet (PM) brushless motor operating in the speed range of 20-40 k r/min, with different PM materials for an overall comparison of the motor performance.
Abstract: This paper deals with the design of a 1-kW permanent-magnet (PM) brushless motor operating in the speed range of 20-40 k r/min. The design procedure involves a parametrical investigation of the most adequate motor configuration by means of a coupled thermal and electromagnetic analysis. The design procedure takes advantage of an analytical study based on Maxwell's equations and is refined by finite-element analysis. Both slotted and slotless motor configurations have been taken into account, with different PM materials for an overall comparison of the motor performance.