Research on an ultrasonic brake

A new design of the ultrasonic brake is proposed. The ultrasonic brake takes the advantage of the ultrasonic levitation. First, the structure of the stator of the brake is designed. In the FE analysis, the mode of flexural vibration of the stator is used. The stator is made of stainless steel and fixed by three pins on the outer diameter, so that the stator vibrates more fiercely in the axial direction. Secondly, an experiment on ultrasonic levitation to determine the relationship between static friction torque and voltage and frequency is performed. Then we know that the rotor could rotate overcoming the pre-pressure of 16.7 N when the voltage is 100 V_p-p, and frequency is 23.5 KHz. Finally, a method of assembling is proposed so that make diameter is smaller and can adjust the pre-pressure. So, the brake has a 45 mm diameter and 12 mm in thickness. The brake overcomes the disadvantage of ordinary brakes, such as over size, high lubrication, and so on.