Ultra-quiet, Energy saving, New green driving force:  As the lifting power, permanent magnet synchronous gearless traction machine reduces the energy loss of the reduction box of the traditional geared tractor and improves the transmission efficiency. Compared with the traditional motor, it can save more than 30％ energy, reduce noise and vibration to the greatest extent, and improve the comfortableness of the product. Besides, we strengthen the car frame structure and adopts extra shock-absorbing measures to reduce vibration. S700B is designed for hospital use in all aspects.