Mobile website
Invited Reviews
2021, 48(7):1-10.
DOI: 10.12177/emca.2021.047
Abstract:
Oil production is a typical high energy consumption industry. Due to the heavy load, light load, no-load and power generation operation conditions of the system, the power supply, drive link and load of the pumping motor system are in low efficiency operation state. To solve these problems, the energy saving technology of this kind of load is analyzed. It is an important way to realize the energy saving of oilfield production. The characteristics and current situation of widely applied technologies such as voltage regulation, energy saving motor, intermittent power supply etc. are studied systematically. Firstly, based on the in-depth analysis of the operation conditions and energy consumption characteristics of the beam pumping motors (BPMs), the nonparametric energy saving technologies which do not change the operation cycle and stroke times of the BPMs are classified according to different energy saving mechanisms and implementation methods. Secondly, the characteristics of the widely used energy saving technologies, such as voltage regulation, energy saving motor and intermittent power supply, are systematically analyzed. Finally, as for improving the better energy saving effect and widening application field of the energy saving technology, some suggestions like detailed analysis of system energy efficiency, integration of various energy saving technologies, and comprehensive transformation of regional energy saving are put forward.
Oil production is a typical high energy consumption industry. Due to the heavy load, light load, no-load and power generation operation conditions of the system, the power supply, drive link and load of the pumping motor system are in low efficiency operation state. To solve these problems, the energy saving technology of this kind of load is analyzed. It is an important way to realize the energy saving of oilfield production. The characteristics and current situation of widely applied technologies such as voltage regulation, energy saving motor, intermittent power supply etc. are studied systematically. Firstly, based on the in-depth analysis of the operation conditions and energy consumption characteristics of the beam pumping motors (BPMs), the nonparametric energy saving technologies which do not change the operation cycle and stroke times of the BPMs are classified according to different energy saving mechanisms and implementation methods. Secondly, the characteristics of the widely used energy saving technologies, such as voltage regulation, energy saving motor and intermittent power supply, are systematically analyzed. Finally, as for improving the better energy saving effect and widening application field of the energy saving technology, some suggestions like detailed analysis of system energy efficiency, integration of various energy saving technologies, and comprehensive transformation of regional energy saving are put forward.
2021, 48(6):1-9，23.
DOI: 10.12177/emca.2021.037
Abstract:
Compared with the conventional pulse width modulation (PWM) technology, random PWM (RPWM) has effective ability of harmonic spectrum dispersion, which can reduce the noise of electromechanical load. The RPWM technology includes three basic methods: initial random switch modulation, and subsequent random pulse position and random switching frequency modulation. With the overall development of power electronics technology, RPWM has been gradually expanded from conventional carrier modulation to space vector modulation, the application prospect is increasingly broad, and the effect of power spectrum peak suppression is continuously improved. At the same time, new optimization schemes are put forward constantly, and the dispersion effect of harmonic and power spectrum is also continuously improved. The research history of RPWM is reviewed, the basic principles of some typical RPWM technologies are introduced, and the future research directions of random PWM are prospected, so as to provide a reference for further research of RPWM technology.
Compared with the conventional pulse width modulation (PWM) technology, random PWM (RPWM) has effective ability of harmonic spectrum dispersion, which can reduce the noise of electromechanical load. The RPWM technology includes three basic methods: initial random switch modulation, and subsequent random pulse position and random switching frequency modulation. With the overall development of power electronics technology, RPWM has been gradually expanded from conventional carrier modulation to space vector modulation, the application prospect is increasingly broad, and the effect of power spectrum peak suppression is continuously improved. At the same time, new optimization schemes are put forward constantly, and the dispersion effect of harmonic and power spectrum is also continuously improved. The research history of RPWM is reviewed, the basic principles of some typical RPWM technologies are introduced, and the future research directions of random PWM are prospected, so as to provide a reference for further research of RPWM technology.
2021, 48(4):1-11.
DOI: 10.12177/emca.2020.230
Abstract:
The multi-degree-of-freedom motor can realize complex motion in space, and has the advantages of simple structure and high accuracy. It has broad application prospects in robot bionic joints, mechanical arms and industrial manufacturing. Firstly, the background, basic principles and technical advantages of multi-degree-of-freedom motor are described. Multi-degree-of-freedom motors are classified according to different mechanisms, and the current domestic and foreign research status of multi-degree-of-freedom motors are summarized. In addition, based on the motion characteristics of the multi-degree-of-freedom motor, the position detection technology and motion control strategy in the motor control process are analyzed. Finally, related descriptions are made on the structure, control system, materials and manufacturing process of the multi-degree-of-freedom motor, and the development trend of the multi-degree-of-freedom motor is predicted. Through the research and analysis of the multi-degree-of-freedom motor, reference is provided for its future development.
The multi-degree-of-freedom motor can realize complex motion in space, and has the advantages of simple structure and high accuracy. It has broad application prospects in robot bionic joints, mechanical arms and industrial manufacturing. Firstly, the background, basic principles and technical advantages of multi-degree-of-freedom motor are described. Multi-degree-of-freedom motors are classified according to different mechanisms, and the current domestic and foreign research status of multi-degree-of-freedom motors are summarized. In addition, based on the motion characteristics of the multi-degree-of-freedom motor, the position detection technology and motion control strategy in the motor control process are analyzed. Finally, related descriptions are made on the structure, control system, materials and manufacturing process of the multi-degree-of-freedom motor, and the development trend of the multi-degree-of-freedom motor is predicted. Through the research and analysis of the multi-degree-of-freedom motor, reference is provided for its future development.
2021, 48(3):1-6.
DOI: 10.12177/emca.2020.213
Abstract:
With the diversified development of electromagnetic launch system (EMLS) application scenarios, a single energy storage device cannot simultaneously meet the high-power-density and high-energy-density energy storage requirements during the launch of different types of loads. The energy storage requirements of EMLS under short-term intermittent operation mode are analyzed, and the current research status and existing defects of EMLS energy storage technology are introduced. On this basis, the key technologies such as energy storage device selection, parallel structure design, capacity configuration, and real-time control that need to be overcome for the application of “lithium battery-supercapacitor” hybrid energy storage to EMLS are discussed and summarized. The future research and development direction of electromagnetic launch hybrid energy storage technology is provided.
With the diversified development of electromagnetic launch system (EMLS) application scenarios, a single energy storage device cannot simultaneously meet the high-power-density and high-energy-density energy storage requirements during the launch of different types of loads. The energy storage requirements of EMLS under short-term intermittent operation mode are analyzed, and the current research status and existing defects of EMLS energy storage technology are introduced. On this basis, the key technologies such as energy storage device selection, parallel structure design, capacity configuration, and real-time control that need to be overcome for the application of “lithium battery-supercapacitor” hybrid energy storage to EMLS are discussed and summarized. The future research and development direction of electromagnetic launch hybrid energy storage technology is provided.
2021, 48(2):13-21.
DOI: 10.12177/emca.2020.202
Abstract:
Due to the abundant reserve and randomness of wave, the control of wave energy conversion system to capture the maximum wave energy and control the grid-connected power quality has become the core issue of wave power generation. The method of wave energy conversion device to achieve the maximum wave energy capture is briefly described. The research results of using sliding mode variable structure control, adaptive control, optimal control, intelligent algorithm, fuzzy control, and passive control to control the maximum wave energy capture and improve power quality are summarized. At last, it is pointed out that the future control algorithm should be a combination of multiple advanced control algorithms.
Due to the abundant reserve and randomness of wave, the control of wave energy conversion system to capture the maximum wave energy and control the grid-connected power quality has become the core issue of wave power generation. The method of wave energy conversion device to achieve the maximum wave energy capture is briefly described. The research results of using sliding mode variable structure control, adaptive control, optimal control, intelligent algorithm, fuzzy control, and passive control to control the maximum wave energy capture and improve power quality are summarized. At last, it is pointed out that the future control algorithm should be a combination of multiple advanced control algorithms.
2021, 48(1):1-7，19.
DOI: 10.12177/emca.2020.195
Abstract:
Due to the merits of rugged structure, strong fault tolerance and high control flexibility, doubly salient electro-magnetic motor (DSEM) can compose a novel competitive aero brushless DC starter generator (SG) system. The composition and working principle of the doubly salient electro-magnetic SG system are briefly described. In response to the requirements of the special application field of aviation power supply, key technologies such as high reliability control, high efficiency and high power density control, and integrated control of the doubly salient electro-magnetic SG are summarized. The developing trends of the above key control techniques for doubly salient electro-magnetic SG are discussed.
Due to the merits of rugged structure, strong fault tolerance and high control flexibility, doubly salient electro-magnetic motor (DSEM) can compose a novel competitive aero brushless DC starter generator (SG) system. The composition and working principle of the doubly salient electro-magnetic SG system are briefly described. In response to the requirements of the special application field of aviation power supply, key technologies such as high reliability control, high efficiency and high power density control, and integrated control of the doubly salient electro-magnetic SG are summarized. The developing trends of the above key control techniques for doubly salient electro-magnetic SG are discussed.
2020, 47(12):1-9.
DOI: 10.12177/emca.2020.166
Abstract:
The dynamometer system for the measurement of power and torque of power machinery equipment is mainly composed of dynamometer motor, dynamometer mechanism and control system. Such systems are widely used in performance testing of mechanical transmission components. The importance of the dynamometer system in the industrial field is briefly described. The classification of dynamometer systems is summarized, and the advantages and disadvantages of all kinds of dynamometers are analyzed. The structure, principle and application scenarios of the current dynamometer systems are introduced. Several classic control strategies of dynamometer systems are summarized. Finally, the application of dynamometer in the performance test of transmission, gearbox, engine and automobile chassis is introduced.
The dynamometer system for the measurement of power and torque of power machinery equipment is mainly composed of dynamometer motor, dynamometer mechanism and control system. Such systems are widely used in performance testing of mechanical transmission components. The importance of the dynamometer system in the industrial field is briefly described. The classification of dynamometer systems is summarized, and the advantages and disadvantages of all kinds of dynamometers are analyzed. The structure, principle and application scenarios of the current dynamometer systems are introduced. Several classic control strategies of dynamometer systems are summarized. Finally, the application of dynamometer in the performance test of transmission, gearbox, engine and automobile chassis is introduced.
2020, 47(9):1-7.
DOI: 10.12177/emca.2020.109
Abstract:
Switched reluctance motor (SRM) has the advantages of ruggedness, high power density, wide speed range, large starting torque and so on. However, there are few researches of power converter for SRM. On the basis of domestic and foreign literature, the asymmetric half-bridge power converter, common switching power converter, split-phase power converter, and three-switch power converter are analyzed. The advantages and disadvantages of these traditional converters are compared. After that, the topology of several new types of power converter and their current-voltage relationship are analyzed, and the future development trend of SRM power converters is summarized. This research will provide reference for the future development of power converters.
Switched reluctance motor (SRM) has the advantages of ruggedness, high power density, wide speed range, large starting torque and so on. However, there are few researches of power converter for SRM. On the basis of domestic and foreign literature, the asymmetric half-bridge power converter, common switching power converter, split-phase power converter, and three-switch power converter are analyzed. The advantages and disadvantages of these traditional converters are compared. After that, the topology of several new types of power converter and their current-voltage relationship are analyzed, and the future development trend of SRM power converters is summarized. This research will provide reference for the future development of power converters.
9 Overview and Prospect of High Performance Magnetic Field Modulation Permanent Magnet Linear Machine
2020, 47(8):1-12.
DOI: 10.12177/emca.2020.092
Abstract:
Permanent magnet linear machine (PMLM) can directly output power in linear motion, which has significant advantages of simple structure and high efficiency. It is suitable for some linear motion applications and attracts more and more attentions. The widely existing magnetic field modulation effect is analyzed, several typical topology structures of PMLM are taken as examples, and the application of the internal magnetic field modulation mechanism is pointed out. Meanwhile, in view of the special structure of PMLM, several modeling methods of electromagnetic parameters are discussed. Finally, the prospects of research on the magnetic field theory, topology structure and application of PMLM are analyzed, providing certain reference value for the practical engineering application of linear machines.
Permanent magnet linear machine (PMLM) can directly output power in linear motion, which has significant advantages of simple structure and high efficiency. It is suitable for some linear motion applications and attracts more and more attentions. The widely existing magnetic field modulation effect is analyzed, several typical topology structures of PMLM are taken as examples, and the application of the internal magnetic field modulation mechanism is pointed out. Meanwhile, in view of the special structure of PMLM, several modeling methods of electromagnetic parameters are discussed. Finally, the prospects of research on the magnetic field theory, topology structure and application of PMLM are analyzed, providing certain reference value for the practical engineering application of linear machines.
2020, 47(7):1-8.
DOI: 10.12177/emca.2020.074
Abstract:
As an important equipment for obtaining vacuum, vacuum pump has received extensive attentions and applications in the fields of electronic chips, large-scale integrated circuits, fine chemicals, biopharmaceuticals, and photovoltaic industries. Its performance largely depends on the drive motor and its control technology. The basic types and working principles of the vacuum pump drive motors are introduced, and their common rules and individual characteristics are summarized. The topologies, cooling methods and intelligent control technologies of the drive motor are reviewed. The control strategies of the vacuum pump drive motors under special working conditions are analyzed. Finally, the main research directions of the vacuum pump drive motor and its control system are prospected.
As an important equipment for obtaining vacuum, vacuum pump has received extensive attentions and applications in the fields of electronic chips, large-scale integrated circuits, fine chemicals, biopharmaceuticals, and photovoltaic industries. Its performance largely depends on the drive motor and its control technology. The basic types and working principles of the vacuum pump drive motors are introduced, and their common rules and individual characteristics are summarized. The topologies, cooling methods and intelligent control technologies of the drive motor are reviewed. The control strategies of the vacuum pump drive motors under special working conditions are analyzed. Finally, the main research directions of the vacuum pump drive motor and its control system are prospected.
2020, 47(2):1-8.
DOI: 10.12177/emca.2019.163
Abstract:
Large-capacity rotating superconducting (SC) motor has bright application prospects in low-speed direct-drive applications such as wind power generation and ship driving. SC motors are classified into rotating and stationary seal SC motors, depending on whether a cryogenic coupling transmission device is used to achieve the transmission of cryogenic medium and the input of excitation power. Stator and rotor configurations and their advantages and disadvantages of rotating seal SC motors are analyzed and summarized, respectively. For stationary seal SC motors, typical topologies such as segmented-rotor flux-switching motor, field-modulation double-stator motor and single-excitation pole-divided motor are used as examples to reveal the essential reason for achieving stationary seal of the cooling system. Finally, the common problems faced by these two types of SC motors are discussed. From the configuration level of the motor, the strategies and methods of suppressing the influence of the armature reaction magnetic field on the SC coil are given for the stationary seal SC motors.
Large-capacity rotating superconducting (SC) motor has bright application prospects in low-speed direct-drive applications such as wind power generation and ship driving. SC motors are classified into rotating and stationary seal SC motors, depending on whether a cryogenic coupling transmission device is used to achieve the transmission of cryogenic medium and the input of excitation power. Stator and rotor configurations and their advantages and disadvantages of rotating seal SC motors are analyzed and summarized, respectively. For stationary seal SC motors, typical topologies such as segmented-rotor flux-switching motor, field-modulation double-stator motor and single-excitation pole-divided motor are used as examples to reveal the essential reason for achieving stationary seal of the cooling system. Finally, the common problems faced by these two types of SC motors are discussed. From the configuration level of the motor, the strategies and methods of suppressing the influence of the armature reaction magnetic field on the SC coil are given for the stationary seal SC motors.
You are thevisitor
沪ICP备16038578号-3
Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
沪ICP备16038578号-3
Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
