Three Phase Asynchronous Motors Classified By Motor Structure Size

① A large electric motor refers to a motor whose center height of the motor frame is greater than 630mm, or whose frame size is 16 or above, or whose stator core outer diameter is greater than 990mm.
② Medium sized electric motors refer to those with a center height of the motor frame between 355-630mm, or frames 11-15, or a stator core outer diameter between 560-990mm.
③ A small electric motor refers to a motor with a center height of 80-315mm or a base size of 10 or below, or a stator core outer diameter between 125-560mm.