Runway type traveling wave type linear ultrasonic motor and single-platform and double-platform feeding devices

Abstract

The invention relates to a runway type traveling wave type linear ultrasonic motor, a single-platform feeding device and a double-platform feeding device. The ultrasonic motor comprises a stator assembly and a rotor. The stator assembly comprises a friction material, a stator elastomer, piezoelectric ceramic pieces and a flexible printed board which are stacked in sequence from top to bottom. Thestator elastic body is in an oval runway shape and comprises two parallel straight line sections, the ends of the adjacent straight line sections are smoothly connected through arc sections to form aclosed structure, the two straight line sections and the two arc sections are symmetrically arranged, and the surfaces of the straight line sections are higher than the surfaces of the arc sections. The piezoelectric ceramic pieces are also arranged in an oval runway shape and are polarized in a partitioned mode. The rotor is of a cantilever beam structure and is suspended above the linear sections of the stator elastomer; the rotor is arranged in a long strip shape, and the part, making contact with the stator, of the rotor is H-shaped. Compared with an existing ring beam type traveling wavetype linear ultrasonic motor, the disclosed ultrasonic motor is larger in output thrust, higher in output efficiency and more excellent in stability and controllability.

Description

technical field [0001] The invention relates to a track-type traveling wave linear ultrasonic motor and single-platform and double-platform feeding devices, belonging to the technical field of ultrasonic motors. Background technique [0002] Ultrasonic motor is a brand-new micro-motor developed in the 1980s. Its working principle is to use the inverse piezoelectric effect of the piezoelectric ceramic sheet to excite the micro-amplitude vibration of the elastomer stator in the ultrasonic frequency domain, and through The friction between the stator (elastic body) and the mover converts the micro-vibration into the macroscopic rotational motion of the rotor, output power, and drives the load; ultrasonic motors can be divided into rotary type and linear type according to the output mode of motion, and linear ultrasonic motors According to the method of converting ultrasonic vibration into a driving force along a certain direction, it can be divided into two categories: travelin...

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Problems solved by technology

for image 3 In the ring beam type traveling wave linear ultrasonic motor shown, the ring beam type metal elastic body (vibrator) is an asymmetric structure, and the frequency consistency of the two vibration modes of the same order is poor, and it is impossible to couple at the same frequency. traveling waves for good driving action; and Figure 4 , Figure 5 The square circular and long annular traveling wave linear ultrasonic motors shown have a relatively more symmetrical structure, but their clamping and fixing methods are basically the same as the previous ones, directly fixing the ring beam metal elastic body (vibrator), See its utility model for details (authorized announcement numbers CN2794032Y and CN2784129Y); in fact, this ring beam metal elastic body (vibrator) has no relatively fixed nodes (nodes with approximately zero vibration), and directly clamps the ring beam metal elastic body. The elastic body (vibrator) has a great weakening effect on the amplitude of its vibration, which leads to poor driving ability and low driving efficiency. Therefore, the practical application of this kind of ultrasonic motor is still extremely rare at home and abroad.

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