normal rotation; forward rotation
Technical term used in machinery and engineering contexts to describe rotation in the standard or forward direction, as opposed to reverse rotation (逆転).
モーターが正転しているか確認してください。
Please check whether the motor is rotating in the normal direction.
このスイッチで正転と逆転
You can switch between forward and reverse rotation with this switch.
正転 means rotation in the normal/forward direction, the direct opposite of 逆転's meaning of reversed rotation.
Compound of 正 (sei, 'correct' or 'normal') and 転 (ten, 'rotation' or 'turning').