Motor-driven System Research Articles

DC Power Networks With Very Low Capacitances for Transportation Systems: Dynamic Behavior Analysis

It is known that conventional analysis based on average models can be used only if the cutoff frequency of the filter is much lower than the switching frequency. For networks with very low capacitances, the cutoff frequency is close to the switching frequency so other tools are required for analyzing the behavior of the system. Such a tool is proposed in this paper and is applied to predict chaotic, multiperiodic or stable behavior of cycles defined by state variables of the system. A permanent magnet synchronous motor-drive system constituted by a dc power source supplying an LC filter connected to a tightly controlled motor is studied. A very low capacitance is provided such that the switching effects due to power electronics device can no more be neglected. Experimental results confirm the validity of the proposed tool.

Design of an Extrusion and Heat Setting Machine for Needled Filter Felts

The setting process of the needling filter felt by heat can control its flatness and cohesion and can ensure its filtering precision. Based on this, the new type of needling process and the new type of heat treatment technology were developed, the setting arc structure and heat preservation measures were designed, the main roller working system for setting and driving motor system were designed, and they have been put into production. The comparative experiment results show that this device overcomes such defects as surface roughness, easy deformation, breathable unevenness, low intensity and short cycle in the traditional filter felt, which can complete the two processes of extrusion and heat setting for once, and the filtration precision, setting efficiency and the rate of qualified products have improved obviously.

Suppression of Hunting in an ILPMSM Driver System Using Hunting Compensator

This paper presents the suppression of hunting in an ironless linear permanent-magnet synchronous motor (ILPMSM) driver system using a hunting compensator. In high-precision motion control servo systems, hunting induced by nonlinear elements such as friction and saturation will reduce the system performance. Hunting means that limit cycle occurs in the system, causing a series of sustained oscillations. The hunting compensator is designed based on the circle criterion to ensure system stability. The effectiveness of the proposed control scheme is verified by simulation and experimental results. The proposed algorithm is experimentally tested on an ILPMSM drive system, and the experimental results confirm the ability of the hunting compensation scheme to suppress the effects of hunting.

Research on a Hub Hydraulic Motor Driving System of Electric Vehicle

This paper applies hydraulic transmissions advantages of small volume, light weight, quick response, stable transmission, great transmission torque and agile spatial arrangement etc. to hub electromotor drive electric vehicle, substitutes hub hydraulic motors for hub electromotors, propose a hub hydraulic motor driving system of electric vehicle. The constitution and working principle of system is then described in detail. The hub hydraulic motor driving system proposed in this paper will help electric vehicle to realize continuously variable transmission, leave out reducer and differential mechanism, reduce the unsprung mass of electric vehicle, make the spatial arrangement of electromotors and batteries more flexible, and achieve the integration control of electric vehicles driving, braking and steering.

Flux and Speed Estimation of Induction Motor Driver System Based on Extended State Observer

Flux and Speed Estimation of Induction Motor Driver System Based on Extended State Observer

무선 가속도센서 시스템을 이용한 건축물의 실시간 피드백 진동제어 - 시스템 구축 및 기초성능 평가 -

본 논문에서는 건축물의 실시간 피드백 진동제어를 위한 기초연구로써, 자체 기술력을 바탕으로 개발된 무선 가속도센서 시스템 및 프로토타입 (Prototype) AMD 시스템을 결합하여 피드백 진동제어 시스템을 구성하고, 모형 건축물을 대상으로 구성된 제어시스템의 기초성능을 평가하고자 하였다. 이를 위하여 본 논문에서는 우선 MEMS 센서 소자 및 블루투스 통신 모듈 기반의 무선 가속도 센서 유닛, 실시간 가속도 응답획득 및 제어법칙에 근거한 제어출력을 구현하도록 구성한 운영프로그램 등을 개발하였다. 또한 AC 서보모터를 이용해 기동되도록 설계한 프로토타입 AMD 및 모터 드라이버 시스템을 구성하였다. 마지막으로 이를 이용해 실시간 피드백 진동제어 시스템을 구성하였고, 2층 모형 건축물을 대상으로 실험실 규모의 진동제어 실험을 수행하여 목적된 구조물의 진동저감 효과를 정량적으로 분석하였다. 실험의 결과, 모형 구조물의 1차 및 2차 공진주파수 그리고 랜덤주파수 등의 실험조건에서 명확한 진동저감의 효과를 확인할 수 있었으며, 종국적으로 본 논문에서 개발한 무선 가속도센서 시스템 및 AMD 시스템이 향후 여타 구조물의 진동제어를 위한 효과적인 수단으로 응용될 수 있는 가능성을 확인하였다. This is a preliminary study for the real-time feedback vibration control of building structures. The study developed a wireless acceleration sensor system based on authentic technology capacities, to integrate with the Prototype AMD system and ultimately construct the feedback vibration control system. These systems were used to evaluate the basic performance levels of the control systems within model building structures. For this purpose, the study first developed a wireless acceleration sensor unit that integrates an MEMS sensor device and bluetooth communication module. Also, the study developed an operating program that enables control output based on real-time acceleration response measurement and control law. Furthermore, the Prototype AMD and motor driver system were constructed to be maneuvered by the AC servo-motor. Eventually, all these compositions were used to evaluate the real-time feedback vibration control system of a 2-story model building, and qualitatively measure the extent of vibrational reduction of the target structure within the laboratory validation tests. As a result of the tests, there was a definite vibrational reduction effect within the laboratory validation tests. As a result of the tests, there was a definite vibrational reduction effect within 1st and 2nd resonance frequency as well as the random frequency of the model building structure. Ultimately, this study confirmed the potential of its wireless acceleration sensor system and AMD system as an effective tool that can be applied to the active vibration control of other structures.

Control of self-assembly defects in thermal nanoimprint

With residual-free imprint, physical self-assembly of the polymer within partly-filled cavities has to be avoided to ensure the masking capability of nanoimprint when used as a lithography technique. In this regard we investigate the impact of the velocity of pressure application by use of a motor-driven imprint system. Slowing-down the velocity of pressure application maintains a smooth surface of the polymeric layer in the cavities, minimizing the risk of local contact between polymer and stamp with moderate filling levels of the cavities. At a high filling level of the cavities, the formation of self-assembly cannot be avoided, as van der Waals interactions between polymer surface and stamp become effective to drive the formation of instabilities. The experimental results obtained can be understood by stability analysis. Understanding of the processes leading to the formation of physical self-assembly is vital to exploit the full potential of nanoimprint for processing.

Fuzzy Immune PID Control of Hydraulic System Based on PSO Algorithm

This paper takes the permanent magnet servo motor-driven hydraulic system as the research object. The hydraulic system power source uses servo motor instead of the original asynchronous motor, becoming a new energy-saving, fast response, and easy to realize closed-loop control hydraulic power systems. Aiming at variability of the load for the hydraulic system, immune algorithm is introduced to incremental PID controller and derive control law. Using fuzzy strategy approximating antibodies inhibit adjustment function to enhance the stability and robustness of the system, and designing fuzzy immune PID controller, parameters of controller are self-optimized by particle swarm (PSO) algorithm. This controller is applied to a hydraulic system, and achieved the precise control of the system flow in a variety of typical conditions. Simulation results show that: the controller can immune modulate automatically according to the dynamic changes of load of the hydraulic system, with fast tracking, small overshoot, and strong robustness advantages.

전기자동차 모터 구동 시스템의 전도 방출에 관한 고주파 모델링 연구

본 논문에서는 고주파 회로 모델링을 이용하여 전기자동차의 모터 구동 시스템으로부터 방출되는 전도성 전자파 노이즈를 시스템-레벨에서 분석하였다. 관련 전도 방출의 주요 원인은 모터 구동 시스템에서 사용하는 펄스폭 변조방식의 스위칭 동작에 기인하며, 이러한 전도 방출은 공통-임피던스 결합 및 유도성 결합을 통해 AM/FM 주파수 대역에서의 무선주파수 간섭을 유발한다. 이러한 문제를 분석하기 위해 모터 구동 시스템을 구성하고 있는 IGBT와 고압 커패시터, 인버터, 모터 및 고전압 케이블과 버스 바에 대한 기본 회로는 물론, 각 부분에서 존재하는 기생 성분 및 비선형 특성을 해석하여 모터 구동 시스템 전체를 포함한 시스템-레벨의 고주파 등가회로 모델을 제안하였다. 이러한 모델을 이용한 모터 구동시스템의 전도 방출 특성을 시뮬레이션하고, 측정하였으며, 비교적 큰 해석구조임에도 불구하고 두 결과가 비교적 잘 일치함을 확인하였다. 향후 이러한 접근방법이 전기자동차의 전자파 적합성 설계에 효과적으로 사용될 수 있을 것으로 기대한다. In this paper, conducted emission from the MDS(Motor Drive System) of a HEV/EV was analyzed using high- frequency circuit modeling in system-level approach. The conducted emission by PWM process can cause RFI(radio- frequency interference) problems in the AM/FM frequency range. In order to mitigate this conducted emission, a high-frequency equivalent circuit model is proposed by analyzing the fundamental circuits, parasitic components in their parts and connections and non-linear characteristics of IGBTs, high-power capacitors, inverters, motors, high-power cables, and bus bars which are composed of the MDS. It is confirmed that the simulated result by the proposed model is well agreed with measured results in spite of a large-scaled analysis in system level. We are looking forward that this approach can be effectively used in the EMC design of HEV/EV.

Physics-Based Modeling of Power Converters From Finite Element Electromagnetic Field Computations

In this paper, a physics-based high-frequency (HF) model of switching power converters including the insulated gate bipolar transistor (IGBT) unit cells, heat sink, and connective printed circuit board (PCB) traces combined in a single electrical circuit is presented. The IGBT model includes the HF stray components superimposed on the well-known Hefner IGBT model. The HF components were calculated using a 3-D quasi-static finite element (3-D FE) analysis. The proposed complex model of the IGBT was verified both numerically and experimentally at different switching frequencies. The computed IGBT model was used in a low-high frequency model of a motor-drive system, and the common mode ground current was experimentally verified showing excellent results.

HIL-Based Finite-Element Design Optimization Process for the Computational Prototyping of Electric Motor Drives

An online hardware-in-the-loop finite-element (FE)-based design optimization procedure is developed for the computational prototyping of coupled electric motor-drive system. A design optimization case for development of permanent magnet (PM) machine drive is presented. The physical representation of the machine is achieved by modeling the machine as a current adjustable load. The mutual interaction of the machine and the existing drive is taken into account by physical connection of the drive to a current adjustable load. The current adjustable load can be automatically renewed due to the design parameter changes of the machine being designed in an optimization process. The optimal design of the PM machine example is realized using the proposed technique and both numerical and test results are discussed.

물류센터의 에너지 효율 개선 방안에 관한 연구

The main sources of energy consumption in warehouses are MHE(Material Handling Equipment), HVAC(Heating, Ventilating and Air Conditioning) and Lighting. Warehouses in advanced countries raise energy efficiencies with energy consumption diagnosis, technology development and systematic management and improvements for MHE, HVAC and Illuminating, etc. They have managed illuminating system, air conditioning, motor driven system, air circulation method, dock facility, layout, AS/RS, conveyor system and battery management, etc. Ansong Pyeongtaek area investigation resulted that 43.9[%] of enterprises are managing partly energy consumption source. But the data resulted with not substantial management of energy consumption but passive management for only electric bill curtailment. Therefore through survey research & visiting interviews of some companies in Ansong Pyeongtaek area, we understood the status of energy consumption source management and proposed energy efficiency methods on the basis of that results.

Fault-Tolerant Operation of Delta-Connected Scalar- and Vector-Controlled AC Motor Drives

Operation and analysis of delta-connected ac motor-drive systems under fault-tolerant open-phase mode of operation is introduced in this paper for both scalar- and vector-controlled motor-drive systems. This technique enables the operation of the three-phase motor upon a failure in one of its phases without the need of a special fault-detection algorithm. It is mainly used to significantly mitigate torque pulsations, which are caused by an open-delta configuration in the stator windings. The performance of the fault-tolerant system was verified using a detailed time stepping finite element simulation as well experimental tests for a 5-hp 460-V induction motor-drive system and the results are presented in this paper This paper also compares the operation of this fault-tolerant mode of operation for the cases of scalar-controlled and closed-loop vector-controlled motor-drive systems.

Modeling and Simulation of 8/6 SRM Control System

This paper introduced and analysis the various components of switched reluctance motor driver system, built each part of the simulation model in Simulink and described the functions and working principle of them. Connecting each simulation model of the system constituted a simulation model of SRD. The system uses dual-loop control, the speed loop with PI control, current loop with angle position and current chopped control methods. It ensures that we can get a satisfactory performance when SRM in the low-speed or high-speed. Simulation results showed the effectiveness of PI regulator error-free speed adjustment.

A Time-Coordination Approach for Regenerative Energy Saving in Multiaxis Motor-Drive Systems

An analytical approach for the management of regenerative energies in multiaxis servo-motor-drives, which can operate in parallel packaging/assembly/manufacturing lines, is presented in this paper. This energy management is achieved through a proper time-coordination between the speed commands of multiaxis drives. Moreover, the proposed approach significantly limits the peak value of the ac input current in these systems. It is mathematically proved that a time-delay can significantly increase the amount of utilized regenerative energy, and consequently decreases the amount of dissipated energy. In this paper, a set of closed-form formulas is developed for different acceleration-deceleration time ratios, where motor losses are neglected. The findings of this investigation were experimentally verified using a two-axis permanent-magnet motor-drive system, and the results are presented in this paper. The experimental results are in remarkable agreement with the developed closed-form formulas.

Data Acquisition System for Electric Vehicle's Driving Motor Test Bench Based on VC++

Abstract In order to solve such problems as great labor intensity, high cost, low efficiency and accuracy during the performance experiment for driving motor system of electric vehicles, and realize data acquisition automatically and synchronously, a data acquisition system for driving motor test bench based on visual instruments is designed. This data acquisition system can be used to obtain the driving motor's parameters of currents and voltages at the same time. This system's hardware is based on electric vehicle's motor test bench in Beijing Institute of Technology, and combined with PXI2010 data acquisition card from ADLINK Company. Visual c++ software is adopted as development tool. In this paper, the design and realization of the hardware and software are presented. Experiment results show that this system improves the efficiency and quality of testing task with high utility. And experiment data can be obtained accurately.

Simulation and Research on Maximum Efficiency of Permanent Magnet Synchronous Motor Driving System

The maximum efficiency of permanent magnet synchronous motor (PMSM) is studied and analyzed on the problem of the efficiency of motor driving system in the paper. Maximum efficiency and minimal loss have the same meaning, the mathematical model of the inverter and the PMSM are set up, thus the relationship between system loss and the stator flux is derived. Therefore, the value of the maximum efficiency of PMSM driving system can be achieved according to the expression of the stator flux. With the use of MATLAB/SIMULINK, the advantages of the loss model method and the search optimization method can be combined effectively to establish the driving system simulation model. While keeping the output-power constant by detecting the inverter-side DC voltage and current, the maximum efficiency and minimum loss in the overall range can be achieved rapidly.

Simulation of Hybrid Excited Doubly Salient Motor Driven Control System

To research the performance of hybrid excited doubly salient motor (HEDS) driven system, a HEDS mathematical model is derived and the simulation driven system is built by Simulink/PSB environment. According to the principal of HEDS driven and its control strategies, several simulations under different operating modes are modeled. The results show that, HEDS driven system is of higher torque at low speed, and is of wide speed range in constant power operation. The simulation results are consistent with theoretical analysis; it shows that the simulation method is validity and effectiveness.

Fault-Tolerant Technique for Δ-Connected AC-Motor Drives

A fault-tolerant technique for motor-drive systems is introduced in this paper. The technique is merely presented for ac motors with Δ-connected circuits in their stator windings. In this technique, the faulty phase is isolated by solid-state switches after the occurrence of a failure in one of the stator phases. Then, the fault-tolerant technique manages current-flow in the remaining healthy phases. This technique is to significantly mitigate torque pulsations, which are caused by an open-Δ configuration in the stator windings. The performance of the fault-tolerant technique was experimentally verified using a 5-hp 460-V induction motor-drive system and the results are presented in this paper.

Modified Elliptical Machine Motor-Drive Design for Assistive Gait Rehabilitation

Current gait rehabilitation systems have limited use in community and home settings due to issues of design, cost, and demands on clinical staff. To overcome these challenges, a new gait rehabilitation machine was designed and developed by modifying an existing elliptical trainer. The Intelligently Controlled Assistive Rehabilitation Elliptical (ICARE) provides answers to design limitations that occur in partial-bodyweight-support treadmill systems and other robotic systems by providing a simulated gait motion without the financial and human resource challenges. The ICARE system integrates ergonomic, comfort and safety enhancements with a motor-drive system to optimize usability by individuals with physical disabilities in hospitals, homes, and fitness settings. The affordable new design provides a complete system that reduces physical demands on clinical staff without compromising patient safety. Development and preliminary testing of the ICARE’s motor-drive system are detailed.