Analysis of the Effects of Three Various Current Control Methods on BLDC Motors

Year 2019, , 1550 - 1566, 31.12.2019

Mehmet Cihat Özgenel

https://doi.org/10.18185/erzifbed.611477

Abstract

Brushless direct current motors are very popular
motors in a wide application area thanks to their superior features. Brushless
motors are the most preferred motors in applications such as domestic,
robotics, office machines, medical, military and space applications, unmanned
aerial vehicles applications because they meet the special requirements of
these applications. Brushless direct current (BLDC) motors have high volume
torque ratio, high efficiency, fast dynamic response; they offer linear
torque/speed characteristics. Speed control of BLDC motors achieves by
implementing pulse width modulation (PWM) technique. Various PWM control
methods are put in to use for controlling of BLDC motor speed. These PWM
methods have some certain advantages and disadvantages. In this study, three
current control PWM methods which are mostly used in practices are examined.
These are full conduction mode, independent and complementary PWM methods. For
this purpose, three BLDC motor pre-drivers have been designed and manufactured
and the effects of these three drivers on the BLDC motor have been examined. It
has been found that complementary PWM mode has given to BLDC motor fast dynamic
response. Full conduction mode has drawn higher dc link current from DC power
supply. Independent PWM method performance is very close to complementary PWM
method.

Keywords

BLDC Motor, Current Control, Pulse Width Modulation, Speed Control of BLDC Motors

Üç Farklı Akım Kontrol Yönteminin BLDC Motorlardaki Etkilerinin İncelenmesi

Abstract

BLDC motorlar üstün özelliklerinden
dolayı geniş bir uygulama alanında çok popüler motorlar olmuşlardır. Fırçasız
motorlar ev, robotik, ofis makineleri, tıbbi, askeri ve uzay uygulamalarında,
insansız hava araçlarında bu uygulamalardaki ihtiyaçları karşıladıkları için
tercih edilirler. BLDC motorlar yüksek verim, hızlı dinamik cevap, lineer
hız-moment karakteristiği ve yüksek hacim moment oranına sahiptirler. BLDC
motorlarda hız ayarı PWM tekniği ile yapılır. Farklı PWM metotları BLDC
motorlar için uygulanmaktadır. Bu PWM metotların üstünlükleri ve mahsurlu
yanları bulunmaktadır. Bu çalışmada çok kullanılan üç değişik PWM metodu
incelenmiştir. Bu metotlar; tam iletim modu, bağımsız PWM modu ve tamamlayıcı
PWM modu metotlarıdır. Bu amaç için üç inverter ön sürücüsü tasarlanmış ve
gerçekleştirilmiş ve metotların BLDC motor üzerindeki etkileri incelenmiştir.
Tamamlayıcı PWM modlu inverterin FDAM’una hızlı bir dinamik tepki kazandırdığı
görülmüştür. Tam iletim modu ile çalışan inverterin doğru akım kaynağından daha
yüksek akım çekmektedir. Bağımsız PWM modlu inverterin performansının
tamamlayıcı modlu inverterin performansına yakın olduğu görülmüştür.

Keywords

BLDC Motor, , Akım Kontrol, Darbe Genişliği Modülasyonu, BLDC Motorların Hız kontrolü.

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