Miniaturization and improvement of performance characteristics of the ignition gas switch using an ultrasonic motor

Abstract One of the most critical requirements of air systems is the limitation of weight and dimensions in the equipment used, and improving these characteristics is always considered one of their main requirements. Therefore, in this research, with the approach of using the advantages of ultrasonic motor, such as simplicity and floating of the structure, miniaturization, self-locking, non-magnetic, high safety, etc., it is proposed to use them as an actuator in the ignition gas switch. A rotary ultrasonic motor was selected as the switch actuator, and the switch's structure was designed in the motor components. In the numerical section, the actuator was analyzed by the finite element method, then the prototype was made, and experimental tests were conducted; the numerical and experimental results were validated. The efficiency of the ultrasonic motor as a separate actuator was verified by measuring the speed and torque. Comparing weight and dimensions, it was found that the new switch could decrease volume, weight, and diameter by 57%, 50%, and 28%, respectively. Conducting environmental tests proved that the new structure of the switch can provide a high functional safety factor in the harsh environmental conditions caused by vibrations and temperature changes.