Field oriented control is a well-known instantaneous torque control method for AC motors. In this method, an integrator included in the automatic current regulator causes the deterioration of torque response due to the s ... more
In this paper, a reference stator flux linkage calculation method is proposed for realizing maximum efficiency operation in direct-torque-controlled interior permanent magnet synchronous motor (IPMSM) drives. The propose ... more
For sensorless vector control of PMSM (Permanent Magnet Synchronous Machine), the effectiveness of a resonance controller is investigated to suppress velocity pulsation caused by periodic disturbance torque. The controll ... more
Several torque ripple suppression methods have been proposed considering the nonlinearity of magnetization characteristics for interior permanent magnet synchronous motors (IPMSMs). These methods can be used even in cond ... more
Current Control of Three-Phase AC Motors Using Inner-Looped D-Matrix Disturbance Suppressor
論文No: ページ数: 9 日付: 2024/04/01
著者: 新中 新二（C&S国際研究所）
キーワード : 三相モータ，電流制御，電流リプル抑制，D因子，2自由度制御系 three-phase motor，current control，current ripple suppression，D-matrix，two-degree-of-freedom control system
Current control of three-phase AC motors with three-phase windings is generally performed via vector control. The basis of current control of motors with good characteristics entails obtaining a sinusoidal current with n ... more
Accurate geometry parameters of interior permanent magnet synchronous motors (IPMSMs) are required to analyze the characteristics of the motor via electromagnetic field analysis. However, in some cases, it may not be pos ... more
Artificial intelligence (AI) translators have made remarkable progress in translation accuracy, resulting from the emergence of “generative AI. ” Doraemon is a fictional cat-like robot from the 22nd century, who brings v ... more
Currently, hybrid railway vehicles utilizing fuel cells (FCs) and lithium-ion batteries (LiBs) are being studied as a means to reduce the environmental impact of non-electrified lines in rural areas. However, in this sys ... more
In DC electric railway systems, energy-saving can be expected by using regenerative brake. However, since the regenerative brake force decreases at high-speed range, the use of a mechanical brake to obtain a constant bra ... more
To study security at facilities, particularly the capture of a suspicious person using only security robots, we investigated the pursuit problem. Multi-agent reinforcement learning has frequently been applied to this pro ... more
The dynamic eccentricity of rotors is a significant obstacle in their manufacturing process. This obstacle causes an imbalanced electromagnetic force and generates unexpected vibrations and acoustic noise. In this study, ... more
This study proposes a maintaining a quadrotor's attitude system using a ‘moment disturbance observer’ aimed at enhancing stability. In recent years, quadrotors have become increasingly prevalent in sectors such as agricu ... more
It is widely known that switching characteristics are affected by parasitic parameters, i.e., stray inductance and capacitance, present in the main circuit of voltage source inverters. In this study, the influence of str ... more
In sensorless control of variable magnetomotive force motor with a wide variable range, the variable magnetic flux changes and the magnetizing current becomes a disturbance, making the control system unstable. This paper ... more
A three-phase inverter with neutral-line voltage injection is proposed to improve the output voltage waveform. This inverter consists of a three-phase inverter and a single-phase inverter. The former is referred to as th ... more
This paper presents a control method for the failure of one of the two units of a double three-phase-wound permanent magnet synchronous machine drive system without contact between these two units by estimating the state ... more
Experimental Verification of Isolation Power Circuit for Transformer-less A. C. Fed Electric Vehicles
論文No: ページ数: 7 日付: 2024/04/01
著者: 福田 典子（公益財団法人鉄道総合技術研究所），舟木 剛（京都大学）
キーワード : SiCパワーモジュール，交流電気車，主変圧器，主回路システム，容量性絶縁，トランスレス SiC power module，AC electric train，main transformer，traction circuit，capacitive isolation，transformer-less
This study aimed to develop a power supply system without a traction transformer for weight reduction and downsizing. Transformer-less power supply is expected to realize step-down, rectification, isolation, and motor dr ... more
D-systems, which inherently possess the ability to separate positive and negative phase components, are used in many applications such as flux estimation, back EMF estimation, current control, and harmonic disturbance su ... more
A high-accuracy magnetization process of permanent magnets (PMs) is desirable for manufacturing a high-performance PM synchronous motor (PMSM). Therefore, estimating the PM magnetization on a manufacturing process is ess ... more
Railways are laid out with facilities scattered along the tracks. Therefore, human resources are required to check the status of such facilities. We have been developing a system that supports the maintenance of faciliti ... more
We present the development of a train forward surveillance method using a camera and sensors. In train forward surveillance methods for railroads, it is crucial to establish a sensor technology capable of reliably detect ... more
In railway track maintenance, the inspection of wooden sleepers is crucial for the safety of train operations. However, the inspection of wooden sleepers is basically performed through manual visual inspection by workers ... more
In this study, we have developed a driver advisory system using a speed estimation technique developed for freight railways aiming to ensure energy-saving and punctuality. The driver advisory system focuses cruising driv ... more
Development of Fatigue Prediction System for Bogie Frame Using a Dynamic Analysis Model Based on High-Speed and High-Precision Stress Estimation Method
Despite ensuring the integrity of bogie frames for railway vehicles via nondestructive inspections during periodic maintenance, the possibility of fatigue cracks occurring at locations other than the predetermined inspec ... more
Generating and modifying speed profiles for running trains is a crucial and evolving aspect of automatic train operation, aiming to achieve high-precision positioning during train stopping motions, traditionally managed ... more
Precise variable output voltage control of boost converters has wide possibility of industrial applications. However, it is challenging owing to the nonlinear and nonminimum phase characteristic of the boost converter. I ... more
Electrification is progressing across different fields such as automobiles and construction machinery. Motors for electric systems are required to be compact and achieve high power density. In this study, we developed a ... more
The dual three-phase PMSM exhibits a current control destabilization phenomenon due to the magnetic coupling between each three-phase winding of the system; in particular, this problem is more difficult to solve in the c ... more
In this study, we considered a stray-capacitance charge recovery circuit to reduce the switching loss of a high-voltage high-frequency inverter. The recovery circuit causes the reactor and stray capacitance to resonate t ... more
We present a novel class-E switching method, and the design and fabrication of a class-Φ2n DC-DC converter based on such a method. To demonstrate the effectiveness of the proposed circuit, we compare the switching voltag ... more
