scholarly journals Sensorless LC Filter Implementation for Permanent Magnet Machine Drive Using Observer-Based Voltage and Current Estimation

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3596
Author(s):  
Chia-Ming Liang ◽  
Yi-Jen Lin ◽  
Jyun-You Chen ◽  
Guan-Ren Chen ◽  
Shih-Chin Yang
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Output Current ◽  
Current Harmonics ◽  
Pwm Inverter ◽  
Current Estimation ◽  
Filter Output ◽  
Lc Filter ◽  
Parameter Error

For pulse width modulation (PWM) inverter drives, an LC filter can cascade to a permanent magnet (PM) machine at inverter output to reduce PWM-reflected current harmonics. Because the LC filter causes resonance, the filter output current and voltage are required for the sensorless field-oriented control (FOC) drive. However, existing sensors and inverters are typically integrated inside commercial closed-form drives; it is not possible for these drives to obtain additional filter output signals. To resolve this integration issue, this paper proposes a sensorless LC filter state estimation using only the drive inside current sensors. The design principle of the LC filter is first introduced to remove PWM current harmonics. A dual-observer is then proposed to estimate the filter output current and voltage for the sensorless FOC drive. Compared to conventional model-based estimation, the proposed dual-observer demonstrates robust estimation performance under parameter error. The capacitor parameter error shows a negligible influence on the proposed observer estimation. The filter inductance error only affects the capacitor current estimation at high speed. The performance of the sensorless FOC drive using the proposed dual-observer is comparable to the same drive using external sensors for filter voltage and current measurement. All experiments are verified by a PM machine with only 130 μH phase inductance.

scholarly journals Zero-Power PEMS System with Full-Bridge PWM Inverter: from Mechanism to Algorithm

2021 ◽  
Author(s):  
Zeyi ZHANG
Keyword(s):  
Integrated Circuit ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Magnetic Suspension ◽  
Iron Core ◽  
Pwm Inverter ◽  
Compensation Algorithm ◽  
Electro Magnetic ◽  
Control Stability

Abstract The permanent-electro magnetic suspension (PEMS) technology takes advantage of the attractive magnetic force between the magnet and the iron core and reduces the power consumption eventually to zero. However, the current of the zero-power PEMS system fluctuates around zero due to disturbances and suffers from the electronic nonlinearity. This work presents that the 2 µs turn-off delay (one electronic defect) of the integrated circuit (IC) L298N (one commercial full-bridge pulse-width-modulation (PWM) inverter produced by STMicroelectronics) leads to the nonlinear current-duty cycle characteristic, which undermines the control stability and limits the PWM frequency of the zero-power PEMS system. Moreover, the nonlinear mechanism is experimentally and theoretically analyzed for the critical PWM frequency and the sensitivity transition. Furthermore, this work proposes the compensation algorithm to overcome the electronic nonlinearity. It is demonstrated that the three-piece linearization approach stabilizes the PEMS system with only a few milliampere current and outperforms the two-piece counterpart with stronger robustness and smoother dynamics under the current-step-change test, especially for the PWM frequency higher than the critical value. Besides, the breakthrough of the critical PWM frequency by the compensation algorithm is of great significance for the dynamic performance of the high-speed PEMS transportation system.

Research on Decoupling Control Strategy for Interior Permanent Magnet Synchronous Motor in Flux-Weakening Region

2012 ◽  
Vol 546-547 ◽  
pp. 313-319
Author(s):  
Liang Liang Mao ◽  
Xu Dong Wang ◽  
Mei Lan Zhou ◽  
Yan Ming Zhang ◽  
Jin Fa Liu
Keyword(s):  
Permanent Magnet ◽  
Control Strategy ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Current Control ◽  
Pwm Inverter ◽  
Current Vector ◽  
Interior Permanent Magnet ◽  
Flux Weakening

Interior permanent magnet synchronous motors can be applied to applications requiring wide-speed operation by means of flux-weakening control. While due to the fixed capacity of PWM inverter, the high speed operation range of interior permanent magnet synchronous motor (IPMSM) is mainly limited by the saturation of current regulator. In constant power region, in stead of the available voltage that controls the armature current vector, the current vector sometimes becomes uncontrollable in transient operations because of the current regulator saturation. In order to extend its operation range, the current vector control algorithm of IPM motor over the base speed operation is proposed in this paper which includes the decoupling current control and the voltage command compensation. Also this paper introduces a judgment method to monitor if the current regulator has gone into saturation or not. Finally on the basis of simulation results, the effectiveness of this control strategy is further confirmed by real drive tests.

Research on the Influence of Harmonics on High-Speed Permanent Magnet Motor

2013 ◽  
Vol 690-693 ◽  
pp. 3275-3278
Author(s):  
Hong Cui ◽  
You Qing Gao
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Stable Operation ◽  
Permanent Magnet Motor ◽  
Stator Core ◽  
Current Harmonics ◽  
Core Losses ◽  
Key Issues ◽  
Motor Control System ◽  
Rotor Losses

The influence of current harmonics on high-speed permanent magnet motor is analyzed in this paper. The several aspects influence of current harmonics are analyzed in detail such as on the stator core losses, copper losses, as well as additional losses, the rotor losses, the electromagnetic torque etc. The necessity of suppressing current harmonics for high-speed motor stable and reliable running and the key issues of high-speed motor control system stable operation is stated.

scholarly journals Simulation and modeling of high voltage DC to AC PWM inverter for electrostatic generator

2018 ◽  
Vol 189 ◽  
pp. 11010
Author(s):  
S. M. A. Motakabber ◽  
M. Wahidur Rahman ◽  
Muhammad Ibn Ibrahimy
Keyword(s):  
High Voltage ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Cost Effective ◽  
Modern Technology ◽  
Pwm Inverter ◽  
Pulse Width Modulated ◽  
Electrostatic Generator ◽  
Lc Filter

This paper proposes a single-phase DC to AC inverter for ESG (electrostatic generators) that may be used in the household’s application. The electrostatic generators were developed a while ago and remained abandoned for a long time. Now, as the modern technology advanced, it’s time to utilize the ESG to power generation. A pulse width modulation (PWM) based high voltage DC to AC inverter is a suitable system for converting the EGS high electrostatic DC voltage into standard 50Hz, 220V(rms) AC. The PWM technique is used to control the inverter switches to create a pulse width modulated bi-phase square wave signal. A lowpass LC filter has been utilized to remove the higher harmonic frequencies and which is capable to reduce the total harmonic distortion (THD) around 3.5%. The proposed model showed the overall system performance in terms of efficiency is 95%. To use ESG, this inverter is an easy and cost-effective electrical device. From the result, it is observed that the output voltage of the proposed inverter is greatly improved compared to the other inverter circuits.

Vibration Noise Suppression Approach Based on Random Switching Frequency (RSF) Control for Permanent Magnet Motor

2020 ◽  
Author(s):  
Yong Li ◽  
Hao Wu ◽  
Qiaorui Si ◽  
Yonggang Liu
Keyword(s):  
Permanent Magnet ◽  
Pulse Width Modulation ◽  
Noise Suppression ◽  
Control Method ◽  
Switching Frequency ◽  
Current Harmonics ◽  
Brushless Dc ◽  
Random Switching ◽  
Bus Voltage ◽  
Vibration Noise

The vibration noise of the distributed drive autonomous ground vehicle (AGV) is mainly produced by the inverter-fed brushless DC permanent magnet in-wheel motor (PMIWM). It is necessary to reduce the vibration noise level of the PMIWM driven by pulse width modulation (PWM). A suppression approach of electromagnetic vibration noise for PMIWM is investigated. Firstly, the air gap magnetic field of the inverter-fed PMIWM was analyzed. The electric current harmonics and the unbalanced magnetic force (UMF) were investigated. The natural frequency and noise of the PMIWM were presented. Then, flux-weaken approach was employed to maintain the robustness of the PMIWM when a sudden drop of DC bus voltage. The random switching frequency (RSF) PWM control method based on two state Markov chain is proposed to decrease the amplitude of the harmonics caused by the switching frequency and the multiple switching frequencies. The experimental results show that the RSFPWM can not only effectively reduce the vibration noise and the inverter losses, but also improve the robustness of the PMIWM control system under unpredictable uncertainties.

Performance analysis of magnetic gear with Halbach array for high power and high speed

2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
High Power ◽  
High Speed ◽  
Torque Ripple ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Halbach Array ◽  
Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

High-Speed Permanent-Magnet Generator with Controlled Magnetic Flux for Aerospace Application

2019 ◽  
Vol 12 (6) ◽  
pp. 290 ◽  
Author(s):  
Viacheslav Vavilov ◽  
Luca Papini ◽  
Flyur Ismagilov ◽  
Shoujun Song ◽  
Valentina Ayguzina
Keyword(s):  
Magnetic Flux ◽  
Permanent Magnet ◽  
High Speed ◽  
Aerospace Application ◽  
Permanent Magnet Generator
Sign in / Sign up

Export Citation Format

Share Document