Permanent Magnet Stepper Motor පරමාණුක ස්ටීපර් මෝටරය

permanent magnet stepper motor eka single-stack variable reluctance motor ena stator construction ekak hondama anuva athara. Eke rotor eka cylindrical shape ekak da, high-retentivity steel eken balanna permanent magnet poles wala bimath karana. Stator eke diametrically opposite poles walin situtu winding lata series connect karana, meka two-phase winding ekak kima.

rotor poles ena stator teeth ena alignment eka winding ena excitation eken peminanava. Misalaya, AA’ coils dala series connect karana Phase A winding ekak kima. sama viya, BB’ coils dala series connect karana Phase B winding ekak kima. adaha diagram eka 4/2-pole permanent magnet stepper motor ekak thibena, eke structural and winding configuration ena visual representation ekak kirimata.

Figure (a) eke, current eka Phase A start kiyen end kiyen gatamata yuti. phase winding eka A label karana, current eka iA+ denota. mese figure eka phase winding eka iA+ current ekak energized karana samayak depict karana. result eken, rotor eke south pole eka Stator Phase A eken attract karana. meka, stator and rotor magnetic axes perfectly align karana, angular displacement α=0∘.

sama viya, Figure (b) eke, current eka Phase B start kiyen end kiyen gatamata yuti. current eka iB+ denota, winding eka B label karana. Figure (b) eke observe karana one, Phase A winding eka current nathi, Phase B eka iB+ current ekak excited karana. meka, stator pole eka corresponding rotor pole eken attract karana, rotor eka 90 degrees clockwise direction ekata rotate karana. this stage eken, α=90∘.

Figure (c) eke, current eka Phase A end kiyen start kiyen gatamata yuti. this current eka iA− denota, winding eka iA− label karana. notably, iA− current eka iA+ current ekata direction ekak opposite. this case eke, Phase B winding de-energized, Phase A winding eka iA− current ekak activated. meka, rotor eka another 90 degrees clockwise direction ekata move karana, angular displacement eka α=180∘ reach karana.

above Figure (d) eke, current eka Phase B end kiyen starting point kiyen gatamata yuti, iB− denota, corresponding winding eka B− label karana. this moment eke, Phase A de-energized, Phase B excited. meka, rotor eka another 90 degrees advance karana, angular displacement eka α 270∘ reach karana.

full revolution of the rotor achieve karana, α=360∘, rotor eka additional 90 degrees move karana when Phase B winding de-energized, Phase A excited. permanent magnet stepper motor eken, rotation direction eka phase current polarity eken determine karana. clockwise rotation karana, phase excitation sequence eka A,B,A−,B−,A, counterclockwise rotation karana, sequence eka A,B−,A−,B,A.

large number of poles with permanent magnet rotor manufacturing significant challenges. meka, this type stepper motor typically limited to large step sizes, 30∘ to 90∘ range. these motors higher inertia, lower acceleration rate compared to variable reluctance stepper motors. however, permanent magnet stepper motors can generate greater torque than variable reluctance stepper motors.