This article reports a screw-driven polyhedron linear ultrasonic motor(USM) of nut-type.It is comprised of a stator,which is a threaded metal nut bonded with piezoelectric plates on its external surface,and a rotor wi...This article reports a screw-driven polyhedron linear ultrasonic motor(USM) of nut-type.It is comprised of a stator,which is a threaded metal nut bonded with piezoelectric plates on its external surface,and a rotor with external threads,which engage with the internal threads of the stator.A traveling wave in the plane is stimulated on the stator when harmonic electric signals are applied to the piezoelectric plates.The traveling wave drives the rotor to rotate,and the threads transform the rotation into a linear motion.The lens can be fixed in the rotor and realize the integrated design of the auto focus system.This structure can omit retarder and directly drive to obtain a high accuracy of positioning,and it is shockproof.A mini AF cellular phone module(8.5 mm×8.5 mm×5.9 mm) driven by this motor was made and an image resolution of 3-5 MP was obtained in the module prototypes of the cellular phone.展开更多
The paper points out what should be taken into consideration when designing self-lock hanging sliding guide screw-design of nut-type stage elevating platforms. Screw climbing should be avoided. The designer should att...The paper points out what should be taken into consideration when designing self-lock hanging sliding guide screw-design of nut-type stage elevating platforms. Screw climbing should be avoided. The designer should attach importance to the stress method of guide screw.展开更多
基金Supported by the National Natural Science Foundation of China (Grant Nos. 50577035 & 10676015)National High-Tech Research and Development Program of China (Grant No. AA02Z472)
文摘This article reports a screw-driven polyhedron linear ultrasonic motor(USM) of nut-type.It is comprised of a stator,which is a threaded metal nut bonded with piezoelectric plates on its external surface,and a rotor with external threads,which engage with the internal threads of the stator.A traveling wave in the plane is stimulated on the stator when harmonic electric signals are applied to the piezoelectric plates.The traveling wave drives the rotor to rotate,and the threads transform the rotation into a linear motion.The lens can be fixed in the rotor and realize the integrated design of the auto focus system.This structure can omit retarder and directly drive to obtain a high accuracy of positioning,and it is shockproof.A mini AF cellular phone module(8.5 mm×8.5 mm×5.9 mm) driven by this motor was made and an image resolution of 3-5 MP was obtained in the module prototypes of the cellular phone.
文摘The paper points out what should be taken into consideration when designing self-lock hanging sliding guide screw-design of nut-type stage elevating platforms. Screw climbing should be avoided. The designer should attach importance to the stress method of guide screw.
