Ci gaba da sauri da ake samu a cikin injina na yau da kullun da fasahar bayanai yana haifar da haɓakar buƙatar madaidaicin sarrafa motsi don kayan aikin fasaha na gaba. Sakamakon ƙarshe shine buƙatar na'urori waɗanda zasu iya samar da ƙarin daidaitattun motsi da sauri a cikin sauri mafi girma. Fasaha sarrafa Servo ya sa hakan ya yiwu. Yaskawa ya ƙaddamar a cikin 1993, Σ Series ya ƙunshi sabbin abubuwan AC Servos waɗanda aka haɓaka ta amfani da fasahar sarrafa servo mai jagora.