برگزار شده توسط : دانشگاه حکیم سبزواری
تاریخ برگزاری : 10 اسفند ماه 1401
The conventional direct torque control (DTC ) method suffers a flux drop at low speeds, which is due to the long selection of zero (neutral) voltage vectors in these speed areas. Past studies with the continuous switch of direct and reverse active ve و...
In this paper, a method for Zero Crossing Point (ZCP) error correction to improve commutation accuracy, called Index Pulse Comparison (IPC), is proposed. Firstly, Brushless Direct Current (BLDC) motor is mathematically modeled and voltage and torque و...
In this paper, the dual-rotor dual-stator axial field flux-switching PM (DR-DS-AFFSPM) topology is presented, designed, and analyzed to improve the cogging torque and torque ripple. The 12-pole dual-stator has been located on both sides of the 10-pol و...
The demand for lightweight converters with high control performance and low acoustic noise, increased the switching frequencies of two-level low-voltage 3-phase converters over the last few years. For high switching frequencies, converter efficiency و...
خلاصه امروزه موتورهای القایی (IM) به طور گسترده مورد استفاده قرار می گیرند و تعمیر و نگهداری آنها مورد توجه زیادی قرار گرفته است. احتمال بروز عیب در یاتاقان و سیم پیچ استاتور در این موتورها زیاد است. این مقاله روشی را برای تشخیص خطای بلبرینگ (BF) و و...
Using the structure of the dual-parallel motors fed by mono-inverter is developing in electric trains and cars for reasons such as managing energy consumption and reducing the volume, weight, and cost of electric motor drives. The major problem in th و...
در این مقاله روشی برای کنترل بدون حسگر مکانیکی برای موتورهای جریان مستقیم بدون جاروبک با استفاده از دوازده پالس شاخص ارائه شده است. ابتدا، موتور BLDC به صورت ریاضی مدل سازی گردیده و معادلات ولتاژ و گشتاور استخراج شده است. سپس، روش تولید دوازده پالس و...
In recent years, multilevel converters have received significant consideration as power-conversion systems for demanding applications requiring high power and power quality. Furthermore, Pulse-width sequences have been recognized as the primary defin و...
Coreless Permanent Magnet machines are increasingly used in many industrial applications, such as automotive and aerospace applications, wind turbines, medical equipment, robotics, servo drives, etc. In coreless PMDC machines, the rotor has a coreles و...
The evaluation and laboratory study of the electrical machines and their drive system can guarantee an optimum design and utilization of electrical drives in many industrial and research-based applications. Therefore, the testing standards and their و...
Direct drive applications have become one of the most exciting research fields recently. Using the modulation effect (already known as the gearing effect), these kinds of machines can work at low speeds and have the low volume at the same time. Perma و...
This paper discusses the equivalent circuit of doubly fed induction machine in relevance to reactive power flow from the rotor. In particular, consistency of the traditional circuit model at super-synchronous speed is studied. It is proven that, whil و...
روش تحلیل پاسخ فرکانسی یک روش جدید تشخیص خطا در ترانسفورماتورها و موتورهای القایی سه فاز می‌باشد. این روش قادر به تشخیص خطاهای رایج در موتورهای القایی نظیر خطای سیم‌پیچی می‌باشد. این مقاله، از روش ذکر شده برای تشخیص خطای سیم‌پیچی استاتور موتورهای ا و...
ژنراتورهای سنکرون بدون جاروبک بواسطه قابلیت اطمینان بالا و نیاز کم به تعمیر و نگهداری در بسیاری کاربردها مورد استفاده قرار می گیرند. در سیستم تحریک بدون جاروبک اندازه گیری ولتاژ و جریان تحریک ژنراتور اصلی امکان پذیر نیست و لذا تخمین این کمیت ها در مو و...
During conversation energy by electric machines, some energy will inevitably be wasted in the form of losses. The machine losses will be converted into heat and will increase the temperature of the machine components. Due to the dependence of electri و...
In this paper, a dual active bridge converter based on the utilization of two transformers is presented. Also, the principles of operation, switching strategy, and transmission power characteristics of the proposed converter are discussed. Moreover, و...
A new type of Dual Stator Permanent Magnet (DSPM) machine, which is capable of producing high torque at low operating speed, for direct-drive applications is proposed and analyzed in this study. ANSYS-MAXWELL-2D/3D computational software is employed و...
Abstract: In hybrid vehicles, the electric motor and the combustion engine work as complements. In choosing the electric motor, the simplicity, cheap price, robustness and stability of the motor are considered, so the reluctance switch machine (SRM) و...
The torque density of multiphase machines with a prime number of phases (five and seven) has been found to be superior compared to machines with other phase numbers. However, these machines need a unique stator design. Hence, either the manufacturing و...
Renewable energy has been the topic of much research over the years. Wind power generation, categorized as a direct drive application, requires a low-speed and high-power density generator. The permanent magnet Vernier machine is one of the flux modu و...
Because of robust rotor structure, switched reluctance motor (SRM) can be a good candidate for high-speed applications. Due to high centrifugal forces at high-speed, structural analysis of the rotor core in an indispensable part of the design. In thi و...
Electric vehicles offer an unmatched experience thanks to their torque profiles. They must be optimized when considering intracity driving cycles (frequent start-stop) by dealing sensitively with the efficiency/performance relationship. Asynchronous و...
در این مقاله به بهبود ساختار قطب روتور به منظور کاهش گشتاور دندانه ای موتور شار محور شار سوئیچینگ مغناطیس دائم پرداخته می شود. روش ارائه شده در این مقاله مشتمل بر دو تکنیک آنالیز ضریب کمان قطب روتور و تکنیک زاویه شکل دهی قطب روتور می باشد. غالب روش ه و...
Dynamometers are widely used for electric machines and their drive systems assessment, reducing prototyping time for many applications, such as Electric Vehicles machines. Having the same mechanical topology allows changing the control algorithm to s و...
در این تحقیق، یک مطالعه شبیه سازی طراحی ساختار بهینه برای استاتور ژنراتور ورنیر روتور خارجی با آهنربا از نوع اسپوک، به منظور بهبود عملکرد کاربردهای مختلف مانند برخی از لوازم برقی خانگی و اکثر تجهیزات انرژی جدید مانند توربین های بادی مورد بررسی و مقای و...
This paper presents an equivalent circuit of the single-phase asymmetric induction machine based on the VBR (Voltage Behind Reactance) model, which is a Thèvenin equivalent, valid in transient and steady-state conditions. This model allows the electr و...
Water coolers are one of the household appliances that have remained in their original form since they became popular, and few changes have been made. This high consumption device, which is widely used in Iran due to weather conditions, needs changes و...
Nowadays, Interior Permanent Magnet Synchronous Motors (IPMSMs) are taken into attention in the industry owing to their advantages. Moreover, in many cases, performing static tests is not enough, and investigating electric machines under dynamic cond و...
The main problem in the BLDC motor drive is high torque ripple. One reason for the torque ripple in this motors is the commutation torque ripple. An efficient method to reduce the commutation torque ripple is PWM-MPC . This method reduces the non-co و...
In this paper, a new topology of fractional slot concentrated winding double rotor axial flux permanent magnet synchronous motor (FSCW-DRAFPMSM) is introduced. The desired structure consists of a non-slotted stator core and two rotor discs. The pole و...
In dynamic-drive tests on electric motors, the dynamometer has a key role. An AC dynamometer has advantages such as higher dynamics, efficiency, and reliability among the other categories like eddy current brake. Since the accuracy of measurement in و...
از جمله خطا های رایج در موتور های القایی، خطای ناهم محوری است که تشخیص به موقع خطا به منظور پیشگیری از گسترش آن از اهمیت بالایی برخوردار است. یکی از رایج‌ترین روشها برای تشخیص ناهم‌مرکزی، تحلیل طیف جریان استاتور موتور (MCSA ) می باشد که تحلیل فوریه ( و...
The induction motor (IM) is by far, the most used motor type in the industry, especially for fixed-speed line-start applications. But, due to the rotor slip and joule losses of the rotor cage, IM hardly reaches high-efficiency classes. A good candida و...
Torque and rotational speed scaling is a typical requirement of industry for a variety of applications. Magnetic gears benefit from numerous advantages due to their physically isolated rotors. Gearing action in magnetic gears occurs by the interactio و...
Nowadays, Permanent Magnet (PM) motors are taken into attention and are widely used in various systems with high-efficiency concerns. In elevator systems, a direct connection is between fault tolerability and human lives, so reliability and lifetime و...
Consequent-pole Permanent Magnet (CPM) machines have been widely proposed due to the high Permanent Magnet (PM) utilization ratio. However, CPM machines suffer from asymmetrical air gap flux density due to using PMs with the same polarity, which caus و...
ریزالوها از جمله مهم‌ترین حسگرهای تعیین موقعیت هستند که به منظور تعیین موقعیت در حرکت چرخشی و خطی مورد استفاده قرار می‌گیرند. در ریزالورهای خطی وجود اثر انتهایی طولی و عرضی منجر به کاهش دقت در اندازه‌گیری موقعیت می‌شود. از این رو استفاده از روش‌های ج و...
Currently, switched reluctance machines (SRMs) have attracted the attention of the research community for electric vehicle (EV) applications due to their good performance at high speeds. This paper presents a new converter that doubles the negative d و...
This work discusses the performance of the predictive functional control (PFC) approach by utilizing two well-known observers as disturbance estimators for permanent magnet synchronous motors (PMSMs), which are frequently characterized by nonlinearit و...
In this article, the calculation of momentary electromagnetic torque in a brushless shaft permanent magnet motor has been done using Lorentz force theory. In this method, the anti-motor voltage and phase current are used and a new method for calculat و...
در این مقاله دو نوع موتور خطی سوئیچ فلاکس که هرکدام در دو ساختار متفاوت ارائه شده اند بررسی و عملکرد آنها آنالیز شده است. در یک نوع میدان از طریق سیم‌پیچی و در نوع دیگر میدان از طریق ماده مغناطیس دائم(آهنربا) تامین می‌شود. در هریک از این دو نوع مذک و...
High voltage converters are commonly used in various applications, namely, PFC, HVDC, water treatment, and high-voltage dc power supplies. This paper proposes a high-voltage output DC-DC LLC resonant converter, which provides some good features such و...
Encoders are the most common speed/position sensors in industrial applications. The commercial encoders are divided into two groups: optical and magnetic types. From accuracy point of view, the first one has distinguished performance. While, the next و...