An ultrasonic suspension bearing for supporting the rotor of motor was designed.This bearing is composed of the radiating end surface of a conical piezoelectric transducer and a conical ring connected at the end surface of the motor rotor.A stable bearing gas film can be formed in the bearing clearance to suspend the motor rotor during the vibration process of the piezoelectric transducer.Through the analysis and test of the bearing capacity,the relationship between the suspension force and the suspension gap was obtained,and the influence of the change of suspension gap and gas film stiffness on the speed of motor was analyzed in theory.Experimental study of the relationship between the maximum rotor speed and the suspension gap was carried out.The experimental results show that the ultrasonic suspension bearing formed by using the conical radiating surface of the piezoelectric transducer and the conical ring can realize the axial and radial bearing of the motor rotor.The stiffness of the gas film in the bearing gap can be enhanced by reducing the suspension gap,the maximum speed of the rotor can be improved,and there is no friction between bearings.