LI Xiao-niu, ZHOU Sheng-qiang,. Ultrasonic motor connected by screw for aperture[J]. Editorial Office of Optics and Precision Engineering, 2014,22(8): 2081-2087
LI Xiao-niu, ZHOU Sheng-qiang,. Ultrasonic motor connected by screw for aperture[J]. Editorial Office of Optics and Precision Engineering, 2014,22(8): 2081-2087 DOI: 10.3788/OPE.20142208.2081.
A new type of hollow ultrasonic motor connected by a screw was proposed to drive an aperture and control and adjust the intensity of the beam. According to the characteristics of a limited angle of rotation for the aperture
the screw was used to connect the stator and the rotor of the ultrasonic motor to apply a pre-pressure to the axial and to implement the circumferential movement of the coupling. The motor is consist of a rotor
a stator and a base and the rotor and aperture were fixed in a setting ring
by which the diaphragm integrated design was realized. The stator modal was analyzed at an operating frequency of 38.26 kHz by using the finite element software. As motor pre-axial movement brings greater pressure changes
the motor has a smaller rotory angle and can not drive the aperture to open or close. To overcome the pre-pressure changes
flexible design of the rotor was performed. Simulation results show that
at default rotation 90° range
pre-pressure changers are within 27% of the variation. Tests show that the stator has excellent vibration characteristics
and its interference from work modal is 5 kHz or more; the impedance variation is not more than 10%
and the pressure change has a little effect on the motor.Furthermore
opening time of the aperture is 5 s
and its closing time is 4.4 s. The diameter of the aperture shows a linear relationship with motor run time. The motor meets the demands of aperture adjustment
and is charaterized by simpler structure and a few aparts.
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references
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