Muna 1895, German Overtone yakagadzira yekutanga pasi roseDC electric drill.Goko rakagadzirwa nesimbi yakakandwa uye rinogona kuboora maburi 4mm mundiro yesimbi.Mushure mezvo, dhiraivha yemagetsi matatu-chikamu (50Hz) yakaonekwa, asi kumhanya kwemota kwakatadza kudarika 3000r/min.Muna 1914, maturusi emagetsi aityairwa ne-single-phase series motors akaonekwa, uye kumhanya kwemota kwakasvika kupfuura 10000r/min.Muna 1927, imwe yepakati frequency yemagetsi turusi ine simba rekupa frequency ye150 kusvika 200 Hz yakaonekwa.Haisi chete ine mukana wekumhanya kweiyo single-phase series mota, asi zvakare ine mabhenefiti eyakapusa uye akavimbika matatu-chikamu simba frequency mota.Nekudaro, inoda kupihwa nepakati frequency current., Kushandisa kunorambidzwa.