2011, Vol.14, No.4, pp.335-347
The article describes the design and control of dynamical
behaviour of a non-contact ultrasonic motor with
flexurally-vibrating ring-shaped stator and rotor provided with
blades. Due to asymmetric arrangement of blades (structural
asymmetry), rotational movement of the rotor can be produced by
excitation of standing waves in the stator in contrast to other
non-contact ultrasonic motors relying on application of travelling
waves. This simplifies design and control of the motor. Dynamics
of the rotor is studied using a finite element method and
qualitative theory of nonlinear conservative systems. It is shown
that the control of structural asymmetry (particularly,
application of an asymmetric rotor with twinned design) can be used
for creation of a dynamical system with no equilibrium points. In
such a system it will be possible to set rotor into stable rotational
motion for any initial angular position.
Key words:
ultrasonic motor, structural asymmetry, finite element
method, nonlinear dynamics
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