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Electrical Machines and Systems, 2001. ICEMS 2001. Proceedings of the Fifth International Conference on

Date 18-20 Aug. 2001

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  • The Fifth International Conference on Electrical Machines and Systems [front matter]

    Publication Year: 2001 , Page(s): 0_1 - xxx
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  • H control of permanent magnet linear motor in transportation systems

    Publication Year: 2001 , Page(s): 706 - 709 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (319 KB) |  | HTML iconHTML  

    A robust H controller for permanent magnet linear motor (PMLM) in transportation systems is designed in this paper. First, the state space equations of the motor are established. Then the H control theory is applied to design a robust controller which allows mass variation of the moving part ranging from 0 to 100 percent of nominal load. The simulation and experimental results show that the system can achieve robust performance under either no load or nominal load. View full abstract»

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  • Application of linear electric motors in the postal mechanical systems

    Publication Year: 2001 , Page(s): 964 - 967 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (300 KB) |  | HTML iconHTML  

    This paper deals with the application of linear electric motors in postal mechanical systems. The author has accomplished the application of several different linear electric motors to different postal machines, i.e., belt conveyers, package sorting machines, push-type suspending conveyers, etc. Postal machines driven by linear electric motors have advantages such as simple construction, high efficiency, noise reduction, ease of control, etc. View full abstract»

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  • Author index

    Publication Year: 2001 , Page(s): 1327 - 1337
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  • Study on iron loss and saturation in brushless doubly-fed machines for adjustable speed drives

    Publication Year: 2001 , Page(s): 1034 - 1036 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (185 KB) |  | HTML iconHTML  

    A time-stepping finite-element model for brushless doubly-fed machines (BDFM) is proposed in this paper. The model can readily represent the effect of saturation. In addition, it is shown that iron losses can be calculated and the saturation factors can be proposed as the time-stepping solution proceeds. The use of saturation factors in conjunction with an analytical model for BDFM is also investigated View full abstract»

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  • Optimization design of special induction motors using improved intelligent simulated annealing algorithm

    Publication Year: 2001 , Page(s): 1163 - 1165 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (186 KB) |  | HTML iconHTML  

    Improvements on an intelligent simulated annealing (ISA) algorithm for the optimal design of electromagnetic devices is investigated in this paper. By using a fuzzy inference method, the ISA can not only reject infeasible design schemes before design calculation, but can also circumscribe the whereabouts of the global optimum and automatically narrow the search scope. In case of making improper decisions in ISA searching, a criterion of recognizing error judgment is developed. The algorithm is applied to the optimal design of induction motors used in electric locomotives, and satisfactory results are achieved View full abstract»

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  • Analytical solutions to determine the field and thrust in a linear servomotor

    Publication Year: 2001 , Page(s): 800 - 802 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (181 KB) |  | HTML iconHTML  

    The analytical formulas to determine the field distribution and the thrust in a linear servomotor are derived in this paper. These are very useful for the optimum design of this kind of motor. Experiments validate the solutions obtained View full abstract»

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  • The SPWM inversion mode of suppressing harmonic waves based on genetic algorithm

    Publication Year: 2001 , Page(s): 1304 - 1307 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (217 KB) |  | HTML iconHTML  

    During the inversion process of an SPWM inverter, it is very important to obtain the moments of a power switch. The magnitude of the harmonic waves can be diminished by the good moments. In this paper, the new method of reducing the influence of all harmonic waves, which can obtain the optimal switching time by using genetic algorithms, is presented. Simulation results show that this method can suppress effectively low-order harmonic wave with the limited items View full abstract»

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  • Direct torque control by means of fuzzy logic [for induction motor drives]

    Publication Year: 2001 , Page(s): 1215 - 1217 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (171 KB) |  | HTML iconHTML  

    Investigations were carried out on an induction motor drive fuzzy logic direct torque control system, which not only reduces the torque ripple, but also reduces the reactive power taken from the mains by choosing the optimum reference flux value. Additionally, this fuzzy controller is adaptive and may be applied to any induction motor View full abstract»

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  • A new method of sliding mode control and application to AC servo system

    Publication Year: 2001 , Page(s): 759 - 762 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (181 KB) |  | HTML iconHTML  

    A new sliding mode control method is presented in this article for AC servo system. Combining fuzzy control and sliding mode control, the chattering of sliding mode control is solved. Introducing an integral element, the stable-state precision is enhanced. The sliding surface designed by means of this method is a time-varied one, which has powerful robustness to parameter variations and external disturbances. Simulation study results show that this method is correct and effective View full abstract»

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  • Transient FEM computation of radial force and torque for bearingless wound-rotor induction motors

    Publication Year: 2001 , Page(s): 991 - 994 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (356 KB) |  | HTML iconHTML  

    This paper presents a bearingless wound-rotor induction motor. The transient responses of radial force and torque in bearingless induction motors are computed with the transient finite element method (FEM) with rotating machine models. It is shown that a steady radial force to support the shaft weight and a constant torque independent of the bearing currents can be generated at the same time. The bearingless wound-rotor induction motor is compared to the bearingless squirrel cage induction motor with respect to the transient responses of radial force and torque. A control system is proposed to implement the combination of levitation and rotation View full abstract»

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  • Effect of a shield on the inductance of a conductor and its application to a compensated pulsed alternator

    Publication Year: 2001 , Page(s): 1037 - 1041 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (277 KB) |  | HTML iconHTML  

    This paper discusses the different effects of conducting and magnetic shields on the circuit inductance, which are of significance in pulsed power technology (PPT). The effect can be used as a generic method to guide the design of the special electrical machines called compensated pulsed alternators (compulsator or CPA) and improve the power output. With the shield technique, the internal inductance of a CPA is reduced greatly to tens of micro-henry making Possible very high current and power output when the CPA discharges. The CPA realizes a most efficient and compact pulsed power supply which can meet rapidly increasing need for military purposes and special industrial uses View full abstract»

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  • A torque control solution for the switched reluctance motor with digital signal processor

    Publication Year: 2001 , Page(s): 1010 - 1013 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (263 KB) |  | HTML iconHTML  

    This paper reports on a torque control solution for the switched reluctance motor (SRM) using the TMS320C240 DSP. The theory of the torque control scheme is analyzed in detail and simulation results are shown. Finally, conclusions are drawn by the authors View full abstract»

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  • Initial rotor position estimation for surface permanent magnet synchronous motor

    Publication Year: 2001 , Page(s): 824 - 827 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (286 KB) |  | HTML iconHTML  

    The purpose of this work is development of an estimation method of initial rotor position for a surface permanent magnet synchronous motor. The principle of the estimation is based on the variation of the current response caused by the magnetic saturation of the stator core when the voltage vector is applied to the motor. This method can be performed without motor parameters and the additional hardware. The decision method of the optimum voltage vector applied to the motor is also proposed to accurately implement the estimation. Experimental results show that the initial rotor position can be estimated without rotating the rotor by using the optimum voltage vector View full abstract»

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  • Hybrid control of permanent magnet of synchronous machine: Self-tuning speed controller and classical IP current controller

    Publication Year: 2001 , Page(s): 726 - 730 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (258 KB) |  | HTML iconHTML  

    This paper deals with control of permanent magnet synchronous machines. Their control is a difficult task because their dynamics are strongly nonlinear. Generally, vector control is used with direct axis current control. However, a problem might arise with such systems in terms of electrical parameter variations and, especially, the mechanical parameters, more specifically the inertia moment of the encircling mass. An adaptive approach is an interesting alternative, when parameters of the machine are unknown or varying in time; in order that objectives imposed by the control are reached and maintained. An adaptive control scheme is presented based on the online parameter estimation of the system or of the regulator View full abstract»

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  • Dynamic matrix control for the step motion of synchronous motor based on the L performance index

    Publication Year: 2001 , Page(s): 770 - 773 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (261 KB) |  | HTML iconHTML  

    Based on the infinity norm performance index, dynamic matrix control (DMC) skillfully combines with the step motion, and a novel control technique of synchronous motor is proposed in this paper. It breaks the traditional control method of the drive, and uses the predictive model based on the dynamic information in the rotor position of the synchronous motor, rolling optimization strategy and the feedback control algorithm to solve the problems of modeling and control for synchronous motor. Simulations are carried out using a 70HP synchronous motor operating at the position and speed control modes, respectively. The results verify the validity of our present method View full abstract»

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  • Realization of SRG position sensorless technique with current chopping mode

    Publication Year: 2001 , Page(s): 1236 - 1239 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (249 KB) |  | HTML iconHTML  

    A novel current chopping strategy for a switched reluctance generator (SRG), a full conducted current chopping (FCCC) scheme, is presented in this paper. According to the characteristics of the phase current waveform of SRG generating operation, it can generate under sensorless conditions without additional circuitry or position signal algorithms. Simulation demonstrates the feasibility of this scheme in detail. Experimental results of a 6 kW 6/4 configuration SRG shows its simplicity and high reliability with little decrease in efficiency View full abstract»

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  • The controlling system of the DC brushless servo motor of the locked position circle

    Publication Year: 2001 , Page(s): 803 - 805 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (198 KB) |  | HTML iconHTML  

    This paper is intended to introduce the position DC brushless servo motor system used in the camera system of small satellites. The controller is based on DSP, and adopts AD2S82 as its axis-angle converter. Having the characteristics of a concise structure and an advanced control strategy, the research model can run steadily at low speed and locate positions accurately, thus coming up to the practical standards of the satellite camera system View full abstract»

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  • Study of position detection method for sensorless brushless DC electromotor

    Publication Year: 2001 , Page(s): 1218 - 1222 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    This paper presents a new method to detect the position of a sensorless brushless DC motor's rotor by using a special microcontroller. The rotor's position is detected using the induced voltage wave of the stator winding. The method provides the following features: the induced voltage modes are detected and converted after the power transistor of the upper bridge in the inducting phase has been turned off for 15 degrees of electric angle; the measurement is synchronized with the carrier wave, and it should avoid meeting with the moment of the peak interference; and the process of using the prediction and evaluation method to estimate the next mode switchover time can rectify the factual value and also insert value accurately when the position signal is lost, so the precision and reliability of the detection are improved View full abstract»

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  • Magnetic bearing control using H fuzzy logic

    Publication Year: 2001 , Page(s): 763 - 765 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (130 KB) |  | HTML iconHTML  

    In this paper, the authors introduce the composition of a magnetic suspension system and its principles, and give its mathematical model. The system adopts a DSP to deal with the data. The H fuzzy controller is designed and the results of its simulation and actual control are given View full abstract»

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  • Integrated sensor based hybrid stepping motor fuzzy speed servo system

    Publication Year: 2001 , Page(s): 702 - 705 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (260 KB) |  | HTML iconHTML  

    Hybrid stepping motors, promising as a high torque and low-speed servomotors, are widely used in microcomputer-controlled machines where they have to perform high-precision positioning operations. But the variations of the mechanical configuration of the drive can lead to step losses. Moreover, the open-loop speed control is weak and a closed loop control is required. The major obstacle to the successful implementation of a closed-loop controlled stepping motor servo system is the cost of a high-resolution optical encoder. In this paper we propose an integrated sensor to get the rotor information, and applying fuzzy control theory to control the speed of a stepping motor. The experiment has been performed using a TMS320F240 DSP. The very good accuracy of the proposed control algorithm is confirmed by experimental results View full abstract»

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  • Sliding mode speed control of a shifted fully pitched switched reluctance machine

    Publication Year: 2001 , Page(s): 1042 - 1052 vol.2
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (621 KB) |  | HTML iconHTML  

    An experimental speed control drive system for the shifted WIN pitched switched reluctance machine, using the C167 embedded controller, is presented. Methods of speed control and acceleration estimation are discussed. System performance is tested for speed step change, speed reversal, speed tracking and load disturbance responses using proportional plus integral (PI) control and sliding mode (SLM) control. A comparison between proportional plus integral and sliding mode speed control, using Slotine's approach, is experimentally carried out and the robustness of sliding mode control is shown View full abstract»

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  • Simulation on adaptive control of electrode regulator systems of arc furnace

    Publication Year: 2001 , Page(s): 687 - 690 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (313 KB) |  | HTML iconHTML  

    The authors present research on the adaptive control of electrode regulator systems of arc furnaces. First, a model of an electrode regulator system is obtained, and then a series of linear transfer functions of the systems are used equivalently instead of the nonlinear transfer operator. Based on this, a plan of model reference adaptive control is put forward. The results of simulation shows that adaptive control systems have better dynamic characteristics than PID control systems, and greatly strengthens the capability of restraining disturbances of arc length View full abstract»

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  • A neural-network-based adaptive estimator of rotor position and speed for permanent magnet synchronous motor

    Publication Year: 2001 , Page(s): 735 - 738 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (269 KB) |  | HTML iconHTML  

    In this paper, by measuring the phase voltages and currents of the permanent magnet synchronous motor (PMSM) drive, a neural-network-based rotor position and speed estimation method for PMSM is described. The proposed estimator includes two recurrent neural networks, one is used to estimate rotor speed and rotor position, and the other is used to estimate stator current. Through using an improved recursive prediction error algorithm, on-line adaptative estimation is realized. The simulation results show that the proposed approach gives a good estimation of rotor speed and position. Especially, the proposed approach has low sensitivity to perturbations of the mechanical parameters and torque disturbances View full abstract»

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  • Study on electricity saving fuzzy controller of asynchronous motors based on fuzzy logic

    Publication Year: 2001 , Page(s): 774 - 777 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (373 KB) |  | HTML iconHTML  

    A kind of electricity saving fuzzy controller (ESFC) has been developed based on fuzzy logic principle in order to save energy and obtain greater electricity efficiency for asynchronous motors during their operation and a set of fuzzy rules are set up to control the input power by adjusting the stator voltage and frequency of asynchronous motors according to the stator current and its derivative without measurement of motor shaft speeds. Much more attention is paid to the analysis of control methods, the design of sampling circuits, the definition of the mathematical model of overload and the discussion of all factors to interfere with its operational reliability. In addition, the hardware block diagram of ESFC dominated by a single-chip microcomputer is also introduced in the paper. The controller has been tested and applied to an underground flameproof magnetic starter. It has been proved that the controller is stable and reliable and is of great applied value in the mining industry View full abstract»

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