He maha nga waahi rereke o te kaiwhakahaere motuka me te motuka ac, he iti te hanga ki te whakauru ki raro. 1. Dc ki dc pūmana nekeneke e taea te tahuri ki te pūngao pūngao, me ac pūmana pūkaha he ki te whakawhiti pūngao me te hurihanga pūngao pūngao. 2. Whiriwhiria te dc, dc motini pūmana me te ac motini pūmana he naia tauutuutu (ac). 3. He maamaa te kaupapa o te hanganga whakahaere motuka dc, a, he raruraru ake te kaiwhakahaere motika ac. 4. Ko te kaiwhakahaere motuka Dc he papa autō, ehara te kaiwhakahaere i te takaro. I runga ake i nga mea katoa, ki te rereketanga i waenga i te kaiwhakahaere motuka dc me te kaiwhakahaere motuka ac ahakoa te mohio.
Ko te roopu HOPRIO he kaihanga ngaio o te kaiwhakahaere me nga motuka, i whakapumautia i te 2000. Te tari matua o te roopu i Changzhou City, Jiangsu Province.