FEM을 이용한 Electromagnetic Clutch 토크해석과 전기자 치수최적화

朴昌浩(Changhao Piao) 대한전기학회 2006 전기학회논문지 B Vol.55 No.5

This study tries to test and analyze the static friction torque generated by an electromagnetic clutch. Then the torque is improved by optimizing the shape of armature. For the purpose of design change and optimization of the electromagnetic clutch, the static friction torque prediction is very important. We construct an axi symmetric FEM model for analyzing the static friction torque and used a torque tester for evaluating the real torque. For a test, predicted static friction torque is compared with the experimental one to discuss the rationality of torque analysis process. The analytical result agrees well with experimental data, explaining the validity of the mathematical process and FEM model. After confirming the torque analysis process, the optimization process is investigated. The optimization result shows that the static torque is improved by changing the armature shape.

MODEL-BASED CONTROL OF ELECTROMAGNETIC VALVE ACTUATORS FOR ENGINE SPEED CONTROL

Huitao Chen,Siqin Chang,Aimin Fan 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.1

The introduction of electromagnetic valve actuators (EMVA) benefits engine fuel economy, torque performance and reduction of emissions. Meanwhile, it complicates the controller for the purpose of regulating the additional freedom degrees of intake valvetrain, such as valve lift, opening timing and opening duration. In order to address the control issue of EMVA application, a model-based controller is needed to realize that the cylinder air charge is regulated by controlling the EMVA motion directly for controlling the engine speed and output torque. For the development of the controller, a control-oriented model of engine with EMVA that can simulate the intake process of unthrottled operation, torque generation and crankshaft rotational dynamics was first developed. Then a model-based EMVA controller was designed to regulate the actuation of electromagnetic intake valves which consisted of a feedforward and a PID feedback module. According to torque-based concept, engine speed reference was translated into torque demand using optimal control theory and the speed control problem was solved as two parts: torque management that decided torque demand and the torque demand tracking. The simulations carried out in Matlab/Simulink verified the effectiveness of the controller. In addition, a test platform of the EMVA for hardware-in-the-loop (HIL) simulation was established and the practicability of EMVA application to engine intake systems was validated preliminarily.

Optimal Rotor Shape Design of Asymmetrical Multi-Layer IPM Motors to Improve Torque Performance Considering Irreversible Demagnetization

M. S. Mirazimi,A. Kiyoumarsi,S. M. Madani 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.5

A study on the multi-objective optimization of Interior Permanent-Magnet Synchronous Motors (IPMSMs) with 2, 3, 4 and 5 flux barriers per magnetic pole, based on Genetic Algorithm (GA) is presented by considering the aspect of irreversible demagnetization. Applying the 2004 Toyota Prius single-layer IPMSM as the reference machine, the asymmetrical two-, three-, four- and five-layer rotor models with the same amount of Permanent-Magnets (PMs) is presented to improve the torque characteristics, i.e., reducing the torque pulsation and increasing the average torque. A reduction of the torque pulsations is achieved by adopting different and asymmetrical flux barrier geometries in each magnetic pole of the rotor topology. The demagnetization performance in the PMs is considered as well as the motor performance; and analyzed by using finite element method (FEM) for verification of the optimal solutions.

8200호대 전기기관차 견인전동기의 설계에 따른 강도 및 운전특성 해석

임채웅(Chae-Woong Lim),윤차중(Cha-Jung Yun),김재문(Jae-Moon Kim) 대한전기학회 2015 전기학회논문지 Vol.64 No.1

In this paper, The strength and driving characteristics of it were investigated according to developing the traction motor for 8200 electric locomotive series. For this purpose, Flux density strength was analyzed and then structural strength was investigated such as a stator frame, design of the rotor shaft bearing according to the design process. In addition, the traction motor operating point was analyzed according to slip frequency variation at a power source frequency. As the results of analysis on torque-speed characteristic curve, we was confirmed that traction motor was controlled as torque control prior to motor speed 1610[rpm], power control between 1610[rpm] and 2500[rpm] and breakdown torque control more than motor speed 2500[rpm].

MODELING ANALYSIS ON IMPROVING CYLINDER BALANCE IN A GASOLINE ENGINE USING ELECTROMAGNETIC VALVE TRAIN

Yaxuan Xu,Siqin Chang,Liang Liu,Tianbo Wang,Maoyang Hu 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.6

For the multi-cylinder gasoline engine, the consistency among cylinders is an important index to affect the engine emission and the engine power. In this paper, an individual cylinder air-fuel ratio (A/F) control method for a fourcylinder camless engine with the electromagnetic valve train (EMVT) was proposed to reduce the imbalance of engine torque. An individual cylinder A/F estimation algorithm with a single universal exhaust gas oxygen (UEGO) sensor based on fading Kalman filtering was introduced. Four proportional-integral feedback controllers were built to regulate the individual A/F by adjusting the intake valve closing (IVC) timing of each cylinder independently based on the EMVT. The effectiveness of the proposed estimation and control approach was validated by co-simulation of GT-Power and Simulink. The results showed that the proposed estimation method could accurately estimate the individual cylinder A/F, and the maximum estimation error under steady state condition was less than 1 %. With the feedback control, both the individual A/F imbalance and the cylinderto- cylinder torque generation imbalance were decreased.

Optimal Rotor Shape Design of Asymmetrical Multi-Layer IPM Motors to Improve Torque Performance Considering Irreversible Demagnetization

Mirazimi, M.S.,Kiyoumarsi, A.,Madani, Sayed M. The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.5

A study on the multi-objective optimization of Interior Permanent-Magnet Synchronous Motors (IPMSMs) with 2, 3, 4 and 5 flux barriers per magnetic pole, based on Genetic Algorithm (GA) is presented by considering the aspect of irreversible demagnetization. Applying the 2004 Toyota Prius single-layer IPMSM as the reference machine, the asymmetrical two-, three-, four- and five-layer rotor models with the same amount of Permanent-Magnets (PMs) is presented to improve the torque characteristics, i.e., reducing the torque pulsation and increasing the average torque. A reduction of the torque pulsations is achieved by adopting different and asymmetrical flux barrier geometries in each magnetic pole of the rotor topology. The demagnetization performance in the PMs is considered as well as the motor performance; and analyzed by using finite element method (FEM) for verification of the optimal solutions.

로터리 MR댐퍼의 설계

이종석(Jong Seok Lee),이지웅,백운경(Woon Kyung Baek) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5

This paper presents the design study of a rotary MRF(Magneto-Rheological Fluid) damper that can be conveniently used in the joints to control the damping torques. The basic design concept is to determine the geometric design variables allowing the magnetic flux to flow across the same sectional areas under volume constraint condition. The effects of each design variables for generating the torques were investigated by magnetic field analyses.

Brushless DC Motor Electromagnetic Torque Estimation with Single-Phase Current Sensing

Chin-Long Cham,Zahurin Bin Samad 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.3

The purpose of this paper was to find an effective method for measuring electromagnetic torque produced by a brushless DC motor with single-phase current sensing in real-time. A torque equation is derived from the theory of brushless DC motor. This equation is then validated experimentally with a motor dynamometer. A computer algorithm is also proposed to implement the electromagnetic torque estimation equation in real-time. Electromagnetic torque is a linear function of phase current. Estimating the electromagnetic torque in real-time using single-phase current is not appropriate with existing equations, however, because of the rectangular alternating-pulse nature of the excitation current. With some mathematical manipulation to the existing equations, the equation derived in this paper overcame this limitation. The equation developed is simple and so it is computationally efficient, and it takes only motor torque constant and single-phase current to evaluate the electromagnetic torque; no other parameters such as winding resistances, inductances are needed. The equation derived is limited to the three-phase brushless DC motor. It can, however, easily be extended to the multiphase brushless DC motor with the technique described in this paper.

Quantitative Analysis of Electromagnetic Torque Generation Mechanism in Axial-Flux Permanent Magnet Machine Based on the Air-Gap Field Modulation Theory

Li Jie,Yang Gongde,Liu Jinliang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1

This paper proposes two axial-fux permanent magnet (AFPM) machines, i.e., NS and NN type, which all have the same stator and rotor structures but the diferent magnetic circuits. Since both PM magnetomotive force (MMF) and armature reaction MMF of the proposed AFPM machines are modulated by H-type armature stator, more feld harmonics that contribute to electromagnetic torque will be generated. The electromagnetic torque generation mechanism of the proposed AFPM machines is revealed and investigated from the perspective of air-gap feld modulation. The MMF-permeance model is established to analyze the feld modulation process of the PM MMF and armature reaction MMF. Based on the efective air-gap feld harmonics that generating steady electromagnetic torque, the electromagnetic torque generation mechanism of the proposed AFPM machines can be confrmed. A fnite element-based harmonic restoration method is used to quantify the electromagnetic torque generation mechanisms of the proposed AFPM machines. It shows that the total electromagnetic torque of the AFPM (NN) machine is lower than that of the AFPM (NS) machine, while the AFPM (NN) machine has higher feld modulation electromagnetic torque component due to the more signifcant feld modulation efect.

Brushless DC Motor Electromagnetic Torque Estimation with Single-Phase Current Sensing

Cham, Chin-Long,Samad, Zahurin Bin The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.3

The purpose of this paper was to find an effective method for measuring electromagnetic torque produced by a brushless DC motor with single-phase current sensing in real-time. A torque equation is derived from the theory of brushless DC motor. This equation is then validated experimentally with a motor dynamometer. A computer algorithm is also proposed to implement the electromagnetic torque estimation equation in real-time. Electromagnetic torque is a linear function of phase current. Estimating the electromagnetic torque in real-time using single-phase current is not appropriate with existing equations, however, because of the rectangular alternating-pulse nature of the excitation current. With some mathematical manipulation to the existing equations, the equation derived in this paper overcame this limitation. The equation developed is simple and so it is computationally efficient, and it takes only motor torque constant and single-phase current to evaluate the electromagnetic torque; no other parameters such as winding resistances, inductances are needed. The equation derived is limited to the three-phase brushless DC motor. It can, however, easily be extended to the multiphase brushless DC motor with the technique described in this paper.