Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 27, No. 1 (January 2014) 143-156   

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  DESIGN, CONSTRUCTION AND COMPARISON OF A SENSORLESS DRIVER CIRCUIT FOR SWITCHED RELUCTANCE MOTOR
 
M. Rafiee, E. Afjei and A. R. Siadatan
 
( Received: March 27, 2013 – Accepted: June 20, 2013 )
 
 

Abstract    In the presented paper, a sensorless driver circuit is designed, constructed and tested to control two types of three-phase Switched Reluctance Motor (SRM). The presented control algorithm has three steps. In the first step, the SRM is controlled by an open-loop method. In the second step, mathematical model of the SRM phase, motor parameters and flux-current-rotor position relation are used in order to calculate the position of the rotor and then control the motor in low speed. In the third step, the current waveform of the excited phase of the motor is utilized in order to detect the rotor position and control the SRM in high speed. In the presented circuit, an Atmega128 AVR microcontroller is used to implement the control algorithms and generate gate pulses of transistors. Asymmetric bridge converter with N-channel Mosfets is used in order to excite the winding of phases. The parameters of the SRMs which are required for designing the sensorless driver circuit are obtained by simulating and analyzing the motors by Finite Element Method (FEM). The constructed circuit is tested in laboratory by driving the selected SRMs in no-load condition and the operational results are obtained and compared to each other at the end.

 

Keywords    Sensorless, SRM, FEM

 

چکیده    در مقاله ارائه شده، يک مدار راه انداز بدون سنسور براي کنترل دو نوع موتور رلوکتانس سوييچي سه فاز طراحي، ساخته و تست مي گردد. الگوريتم کنترلي ارائه شده شامل سه مرحله است. در مرحله اول، موتور رلوکتانس سوييچي با يک روش حلقه باز کنترل مي شود. در مرحله دوم، از مدل رياضي فاز موتور رلوکتانس سوييچي، پارامترهاي موتور و رابطه شار-جريان-موقعيت روتور، به منظور محاسبه موقعيت روتور و پس از آن کنترل موتور در سرعت پايين استفاده مي گردد. در مرحله سوم، از شکل موج جريان فاز تحريک شده به منظور کشف موقعيت روتور و کنترل موتور در سرعت بالا استفاده مي شود. در مدار ارائه شده، از يک ميکروکنترلر Atmega128 از خانواده AVR براي پياده سازي الگوريتم هاي کنترلي و توليد پالس گيتهاي ترانزيستورها استفاده شده است. از کانورتر پل دو سوييچه با ماسفتهاي نوع N به منظور تحريک سيم پيچ فازها استفاده شده است. پارامترهايي از موتورهاي رلوکتانس سوييچي که براي طراحي مدار راه انداز بدون سنسور احتياج است، از طريق شبيه سازي و تحليل موتورها توسط روش اجزا محدود بدست آمده اند. مدار ساخته شده در آزمايشگاه توسط موتورهاي انتخاب شده در شرايط بي باري تست مي شود و نتايج عملي بدست آمده و درآخر با يکديگر مقايسه مي گردند.

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