Cogging Torque Mitigation of Modular Permanent Magnet Machines

Abstract

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Demagnetization Withstand Capability Enhancement of Surface Mounted PM Machines Using Stator Modularity

“…17 shows the measured and predicted cogging torques of the modular PM machine with defective and healthy rotors. It has been established that the cogging torque of modular PM machine is mainly determined by the factor , which is the least common multiple of the rotor pole number ( ) and the flux gap number ( ) [19]. For the healthy rotor case, equals to 30 if is 6 and is 10, and hence, there are 5 cogging torque periods within 60 Mech.…”

Yüzey Mıknatıslı Eksenel Akılı Motorlarda Rotor Mıknatıslarına Adım Ve Kayma Uygulanarak Moment Dalgalanmasının Azaltılması

“…Yine bu motor türünün profili gereği moment dalgalanmalarına neden olmaktadır [11]. Bu dalgalanmayı azaltmanın yollarından birisi de zıt EMK' dalga şeklini sinüse yaklaştırmaktır [1][2][3] Burada J in , r i iç yarıçapındaki akım yoğunluğunu, B g hava aralığındaki manyetik akı yoğunluğunu, α ise r i /r o ile hesaplanan yarıçap oranını ifade etmektedir. Şekil 2'de moment oluşum prensibi görsel olarak anlatılmaktadır.…”

Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM

“…The cogging torque is one of the most representative components of torque ripple in the permanent magnet synchronous motor (PMSM). Therefore, studies on the reduction method for the cogging torque have been actively carried out to minimize the torque ripple [1][2][3][4][5][6][7][8][9][10][11]. Those studies on cogging torques have been mainly focused on reducing the cogging effect by modulating the combination of the pole and slot number, the pole arc, the shape of the core, the skew angle, the notching, etc.…”