High reliability: simple system and gearless drive; Strong power: the rated torque is provided for starting; the torque overload of three times can be provided theoretically (according to the requirement of order); Current reduction: the starting current of the equipment is not higher than the rated current; the current is proportional to the load characteristics; Energy saving: 20%; Less maintenance: only a small amount of grease is required for the bearing; Small occupied space: combi