Effect of Pressing Force Applied to a Rotor on Disk-Type Ultrasonic Motor Driven by Self-Oscillation

Abstract

In this paper the relationship between the pressing force applied to a rotor and the rotation characteristic of an ultrasonic motor driven by self-oscillation are discussed. The motor used here is an in-phase drive-type ultrasonic motor using two degenerate bending vibration modes of a disk. The picking-up electrical signal caused by self-oscillation is positively fed back into the piezoelectric ceramics for driving through an operational amplifier and a step-up transformer. The pressing force applied to a rotor was measured using a force gauge coupled to the shaft of the ultrasonic motor. As a result, it was confirmed that the selection of the picking-up position for the feedback signal is important for a stable starting and running of the disk-type ultrasonic motor driven by self-oscillation.

A Piezoelectric Servo Feed Drive for Electro Discharge Machining System Industrial Applications Using Linear Ultrasonic Motor

“…(8). The main parameters of the relation were obtained during the machining process for various electro-machining parameters using both systems for control.…”

“…M.R.R(mmVmin) = (workpiece weight loss(gm) x 1000) (Density (gm/cc)) x (Machining time (min)) (8) Fig. 25 The material removal rate versus various electromachining parameters for both systems of control using dc servomotor and piezoeiectric USM M.R.R is the material removal rate.…”

“…The configuration and structure of a piezoelectric ultrasonic servo drive mainly depends on the industrial application requirements [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. They potentially offer a significant fiexibility for position and feed-rate control [15][16][17][18].…”

“…The stator, rotor, and sliding element, jointly with the frame of the motor, form the linear structure of the USM. The working principle is based on creating elliptical micro motions of surface points generated by superposition of longitudinal and bending vibration modes of oscillating structures [7,8]. By pressing the rotor against the driving tip of the stator, the micro motions are converted into a rotary and linear motion through the friction between parts of the motor.…”

Microstepping control of ultrasonic stepping motors

“…In order to get rid of this bulky and costly closed-loop system, the first ultrasonic stepping motor (USSM) was proposed in 1993 [6]. However, this motor generally involves many projections on the stator and many slits in the rotor, hence, suffering from the difficulty in controlling the degenerated modes [7], [8].…”