Poyerekeza ndi mota ya DC ndi mota yopanda ulusi, makhalidwe ofunikira aukadaulo a mota ya Brushless DC ndi awa:

1. Makhalidwe ogwirira ntchito a mota ya DC amapezeka pogwiritsa ntchito njira zamagetsi. Ili ndi mphamvu yowongolera bwino komanso liwiro lalikulu.

2. Chidziwitso cha mayankho a malo a rotor ndi dalaivala wa inverter wamagetsi wa multiphase ndizofunikira.

3. Kwenikweni, mota ya AC imatha kugwira ntchito mwachangu popanda kung'ambika kwa burashi ndi commutator. Ili ndi kudalirika kwambiri, nthawi yayitali yogwira ntchito komanso sikufunika kukonzedwa.

4. Mota ya DC yopanda brushless ili ndi mphamvu zambiri, palibe kutayika kwa rotor ndi kutentha, komanso imagwira ntchito bwino kwambiri: poyerekeza ndi deta, mphamvu ya mota ya 7.5 kW yopanda brush ndi 86.4%, ndipo mphamvu ya mota ya DC yopanda brushless yomweyi imatha kufika 92.4%.

5. Payenera kukhala zida zowongolera zamagetsi, mtengo wonse ndi wokwera kuposa mota ya DC.

Pali mitundu iwiri ya ma mota omwe amagwiritsidwa ntchito mu AC system: induction motor ndi permanent magnet synchronous motor. Permanent magnet synchronous motor ingagawidwe m'magulu awiri: sinusoidal back EMF permanent magnet synchronous motor (PMSM) ndi square wave back EMF brushless DC motor (BLDCM) malinga ndi mfundo zosiyanasiyana zogwirira ntchito. Kuti mphamvu yawo yoyendetsera ndi njira yowongolera ikhale yosiyana.

EMF yakumbuyo ya mota ya sinusoidal permanent magnet synchronous ndi sinusoidal. Kuti mota ipange torque yosalala, mphamvu yamagetsi yomwe ikuyenda kudzera mu injini iyenera kukhala sinusoidal. Chifukwa chake, chizindikiro cha rotor position chokhazikika chiyenera kudziwika, ndipo inverter ikhoza kupereka mphamvu yamagetsi ya sinusoidal kapena mphamvu yamagetsi ku mota. Chifukwa chake, PMSM iyenera kugwiritsa ntchito mphamvu yamagetsi kapena yamagetsi yapamwamba. Kutsimikiza kwa encoder kapena resolver ya malo ndi kovuta kwambiri.

BLDM sikufuna sensa yokhazikika ya malo, chipangizo choyankhira ndi chosavuta, ndipo njira yowongolera ndi yosavuta. Kuphatikiza apo, mphamvu ya maginito ya BLDCM trapezoidal wave yochokera ku air gap ndi yothandiza kwambiri kuposa ya PMSM sinusoidal wave, ndipo mphamvu ya BLDCM ndi yokwera kuposa ya PMSM. Chifukwa chake, kugwiritsa ntchito ndi kufufuza kwa mota ya DC yopanda maginito yokhazikika kwalandira chidwi chachikulu.