163 resources related to Soft Starters
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Energy conversion and conditioning technologies, power electronics, adjustable speed drives and their applications, power electronics for smarter grid, energy efficiency,technologies for sustainable energy systems, converters and power supplies
APEC focuses on the practical and applied aspects of the power electronics business. Not just a power designer’s conference, APEC has something of interest for anyone involved in power electronics including:- Equipment OEMs that use power supplies and converters in their equipment- Designers of power supplies, dc-dc converters, motor drives, uninterruptable power supplies, inverters and any other power electronic circuits, equipments and systems- Manufacturers and suppliers of components and assemblies used in power electronics- Manufacturing, quality and test engineers involved with power electronics equipment- Marketing, sales and anyone involved in the business of power electronic- Compliance engineers testing and qualifying power electronics equipment or equipment that uses power electronics
The PCIC provides an international forum for the exchange of electrical applications technology related to the petroleum and chemical industry. The PCIC annual conference is rotated across North American locations of industry strength to attract national and international participation. User, manufacturer, consultant, and contractor participation is encouraged to strengthen the conference technical base. Success of the PCIC is built upon high quality papers, individual recognition, valued standards activities, mentoring, tutorials, networking and conference sites that appeal to all.
All areas of ionizing radiation detection - detectors, signal processing, analysis of results, PET development, PET results, medical imaging using ionizing radiation
IECON is focusing on industrial and manufacturing theory and applications of electronics, controls, communications, instrumentation and computational intelligence.
Research, development, design, application, construction, installation, and operation of electric power generating facilities (along with their conventional, nuclear, or renewable sources) for the safe, reliable, and economic generation of electrical energy for general industrial, commercial, public, and domestic consumption, and electromechanical energy conversion for the use of electrical energy
Theory and applications of industrial electronics and control instrumentation science and engineering, including microprocessor control systems, high-power controls, process control, programmable controllers, numerical and program control systems, flow meters, and identification systems.
This magazine publishes articles concerning technical subjects and professional activities that are within the scope of IAS and are of interest to society members. The information includes but is not limited to articles, product reviews, book reviews, new standards, education information, announcements of conferences, workshops, new publications, committee meetings and reports of IAS activities.
The development and application of electric systems, apparatus, devices, and controls to the processes and equipment of industry and commerce; the promotion of safe, reliable, and economic installations; the encouragement of energy conservation; the creation of voluntary engineering standards and recommended practices.
The IEEE Region 9 is releasing the IEEE Latin America Transactions to enable the publication of non-published and technically excellent papers from Latin American engineers, in Spanish or Portuguese languages. Engineers and researchers from Portugal and Spain (and others countries with the same language) are also very welcome to submit their proposals.
IEEE Industry Applications Magazine, 1997
This article describes results of an experimental evaluation of seven commercial soft-starters used with three motors of different power ratings. Several performance indicators have been measured and compared to illustrate operation of soft-starters and assess their energy-saving capabilities. Three standard squirrel-cage induction motors, rated at 3 kW, 7.5 kW, and 22 kW, were used. Several European manufacturers provided soft-starters for ...
IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society, 2015
Advanced analysis of the motor starting currents enables very reliable diagnostics of the rotor condition, providing immunity against the eventual false alarms obtained with the conventional MCSA. However, the application of this methodology has been mainly restricted to the case of line-started machines. Its extension to the cases of soft-started or inverted-fed motors has been barely investigated, especially because the ...
IEEE Transactions on Industry Applications, 2009
This paper studies the application of high-frequency voltage excitation-based stator winding diagnostic methods to three-phase ac machines operated from power converters that create the necessary high-frequency excitation as part of their normal operation. This paper focuses on two specific operating modes: 1) machines operated from inverters in the overmodulation region and 2) machines operated from soft-starters during startup. In both ...
2011 International Conference and Seminar on Micro/Nanotechnologies and Electron Devices Proceedings, 2011
Widespread thyristor devices used to soft start of alternating voltage motors reduce the starting current by a factor of 2 or 3, but greatly deform its profile and produce an additional reactive component of the current. As a result, the input coefficient of the starting device power decreases and the losses of the motor active power increase. Non-standard approaches to ...
The 2010 International Power Electronics Conference - ECCE ASIA -, 2010
This paper proposes a new starting method of a harmonic current compensator using a hybrid active filter for wind power generation systems. In the proposed method, an active filter of the hybrid power filter behaves a resistor and reactive power compensator to suppress the inrush current and leading currents for the passive filter under the starting condition. The basic principle ...
Soft, Printable, and Small: An Overview of Manufacturing Methods for Novel Robots at Harvard
Octopus-Inspired Robot Can Grasp, Crawl and Swim -- IEEE Spectrum Report
Ten Empowering Skills for Rising Stars: IEEE President-Elect Karen Bartleson
Soft Robotics & Biologically Inspired Robotics at Carnegie Mellon University
From ‘Green & Soft’ to ‘Open & Smart’ - Chih-Lin I - 5G World Forum Santa Clara 2018
Mark Dehong Xu, Distinguished Lecturer
IROS TV 2019- How to Build a Robot: Marine Bio-inspired Soft Robotics
Fuzzy and Soft Methods for Multi-Criteria Decision Making - Ronald R Yager - WCCI 2016
IMS 2015 Keynote: Soft Assemblies of Radios, Sensors and Circuits for the Skin
Worms, Waves, and Robots
IROS TV 2019- Macau- Episode 1- Robots Connecting People
APEC 2011-Intersil Promo Apec 2011
HKN: Flying With Confidence - Navigating the First Steps of Your Career
Tracked Vehicle with Circular Cross-Section to Realize Sideways Motion
IMS 2015: Robert H. Caverly - Aspects of Magnetic Resonance Imaging
Fun and Games with Artificial Intelligence: David B. Fogel
IEEE Future Networks Initiative: Enabling 5G & Beyond - Ashutosh Dutta - IEEE Sarnoff Symposium, 2019
Challenging the stigma surrounding the role of women in technology, a journey from combinatorial optimization to IBM
HKN: The Next Big Thing Panel
This article describes results of an experimental evaluation of seven commercial soft-starters used with three motors of different power ratings. Several performance indicators have been measured and compared to illustrate operation of soft-starters and assess their energy-saving capabilities. Three standard squirrel-cage induction motors, rated at 3 kW, 7.5 kW, and 22 kW, were used. Several European manufacturers provided soft-starters for the investigation. Tests were performed under the steady-state and transient operating conditions.
Advanced analysis of the motor starting currents enables very reliable diagnostics of the rotor condition, providing immunity against the eventual false alarms obtained with the conventional MCSA. However, the application of this methodology has been mainly restricted to the case of line-started machines. Its extension to the cases of soft-started or inverted-fed motors has been barely investigated, especially because the probability of rotor damage is claimed to be reduced under such conditions. Nonetheless, industrial cases related to rotor damages in induction motors operated via soft-starters and frequency-converters have been recently reported. This paper proposes a twofold transient-based approach for the reliable assessment of the rotor condition in induction motors operated with such elements. The method relies on the advanced analysis of the motor starting current by combining two types of time-frequency approaches (based on discrete and continuous transforms) in two subsequent stages: 1) fault pattern identification and 2) fault severity quantification. Field results obtained with large motors operating in a sewage treatment plant confirm the validity of the methodology for the rotor assessment in induction motors operated both via soft-starters and frequency converters.
This paper studies the application of high-frequency voltage excitation-based stator winding diagnostic methods to three-phase ac machines operated from power converters that create the necessary high-frequency excitation as part of their normal operation. This paper focuses on two specific operating modes: 1) machines operated from inverters in the overmodulation region and 2) machines operated from soft-starters during startup. In both cases, high- frequency (in the range of the hundred hertz) voltage components at well- defined frequencies are created. The negative-sequence currents induced from these high-frequency voltages are shown to contain accurate information on the level of asymmetry (fault) in the machine. This information is significantly richer than exists in other modes of operation, i.e., inverters working in the linear modulation region or soft-starters in the steady state, and provides interesting opportunities to complement other diagnostic methods.
Widespread thyristor devices used to soft start of alternating voltage motors reduce the starting current by a factor of 2 or 3, but greatly deform its profile and produce an additional reactive component of the current. As a result, the input coefficient of the starting device power decreases and the losses of the motor active power increase. Non-standard approaches to build-up of arrangements of a smooth start of the induction and synchronous motors are considered, allowing to improve quality of starting current of the motor and to reduce or even to come to naught additional consumption of reactive power of a network. Use of rates on thyristor voltage besides, improves. This method is based on the symbiosis of the concepts of the discrete amplitude and the continuous phase or pulse-width regulation. External, energy characteristics and regulation curve of regulators are calculated.
This paper proposes a new starting method of a harmonic current compensator using a hybrid active filter for wind power generation systems. In the proposed method, an active filter of the hybrid power filter behaves a resistor and reactive power compensator to suppress the inrush current and leading currents for the passive filter under the starting condition. The basic principle of the proposed starting method is discussed, and then confirmed by digital computer simulation using PSCAD/EMTDC. Simulation results demonstrate that the proposed starting method can overcome the inrush and leading currents for the passive filter, building up the dc capacitor voltage of the active filter.
The present paper presents an study on the harmonics introduced by thyristor- based soft-starters in the induction motor starting current. It is observed how the use of these starting elements leads to the amplification of the amplitudes of some specific harmonics. The application of continuous time- frequency decomposition tools enables to visualize the full transient evolutions of these harmonics and discern those that are amplified when using such drives. The identification of the current harmonics introduced or amplified by soft-starters is very useful when applying induction motor fault diagnosis techniques based on the analysis of the startup current, since it enables to discriminate between the components amplified by the soft-starters and those amplified by the fault. Soft-started laboratory motors are employed in this work to study the harmonics amplified by a thyristor-based soft- starter under non-ideal supply conditions. The results reveal that these signal processing tools may be very useful to analyze the components introduced by the drive and, at the time, discriminate them versus eventual fault-related harmonics.
The reliable assessment of the rotor condition in induction motors is a matter of increasing concern in the industry. Although rotor damages are more likely in line-started motors operating under high inertias, some cases of broken rotor bars in motors supplied via soft starters have been also reported in the industry. Motor current signature analysis (MCSA) is the most widely spread approach to diagnose such failures. However, its serious drawbacks in many real industrial applications have encouraged investigation on alternative methods enhancing the reliability of the diagnosis. This paper extends a recently introduced diagnosis methodology relying on the startup current analysis to the case of soft-starter-operated motors. The approach has proven to provide very satisfactory results, even in cases where the classical MCSA does not lead to correct diagnosis conclusions. However, its extension to operation under soft starters was still a pending issue. The experimental results shown in this paper ratify the validity of the proposed diagnosis approach in soft-starter-operated induction motors.
This paper proposed a DFC (discrete frequency control) method based on equivalent sinusoidal modulation for thyristorized soft starters, including the basic control method and a simplified method to search for the optimal initial phase angle combinations of three-phase DFC system. The compensation mode of freewheeling angle of a thyristor and the transition method from one discrete frequency to another are also studied. This method, based on the fixed main circuit of traditional soft starters, allows an induction motor to start with a reduced starting current and a high starting torque. Simulations based on Matlab-Simulink are carried out and a 7-stage DFC system based on DSP-TMS320F2812 is built. Experimental results confirm the proposed method has good starting torque and current performance.
Fault tolerant operations of soft starters and adjustable-speed drives (ASDs) when experiencing power switch open-circuit or short-circuit faults are presented in this paper. The present low-cost fault mitigation solutions can be retrofitted into the existing off-the-shelf soft starters and ASDs with only minimum hardware modifications. The fault tolerant soft starters are capable of operating in a two-phase mode under the condition of thyristor/SCR open-circuit or short-circuit switch-fault in any one of the phases using a novel resilient closed-loop control scheme. The performance resulted from the present soft starter fault tolerant control has demonstrated reduced starting motor torque transient and inrush current magnitude. As for the ASDs, a low- cost fault mitigation strategy for low-speed applications such as "self- healing/limp-home" needs for vehicles and propulsion systems, with capabilities for mitigating transistor open-circuit and short-circuit switch- faults was developed. The present fault tolerant drive topology requires only minimum hardware modifications to the conventional off-the-shelf six-switch three-phase drive, with only the addition of electronic components such as triacs and fast-acting fuses. In addition, the present approach offers the potential of mitigating not only transistor switch-faults but also drive related faults such as rectifier diode short-circuit fault or dc link capacitor fault. Given in this paper is a complete set of simulation results that demonstrate the soundness and effectiveness of the present fault tolerant approaches.
Time-varying harmonic distortion of induction motor soft-starter was exemplarily assessed by most common signal processing techniques like Short- time Fourier Transform, Wavelet Packet Transform and Kalman Filtering. Furthermore the resonance phenomena are considered that appear the grids with power factor correction supplying induction motors with soft-starters.
No standards are currently tagged "Soft Starters"