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In order to improve the output performance, multi-stator structure is applied to traveling wave type ultrasonic motor (TWUM). In this paper, taking into account the multi-stator traveling wave type ultrasonic motor (MSUM) with diameter of 60mm, authors apply the elastic contact principle to deduce the MSUM's simulation model. By reason of machining errors and installation errors, the stators and rotors...
A radial composite ultrasonic motor is proposed in this paper. The configuration and the working principle of the motor are presented. Finite element model of the stator is developed and the dynamics of the stator are simulated based on modal analysis and harmonic analysis. A prototype of the stator is fabricated. The impedance-frequency characteristic and the radial vibration amplitude stimulated...
This paper investigates the surface-mounted permanent-magnet (SPM) and the interior permanent-magnet (IPM) motors for high-speed applications. An SPM motor and an IPM motor are designed with the same power/speed rate and the same key dimensions. Finite-element analysis is used to compare the mechanical, electromagnetic, and antidemagnetization performances of the two motors, and lumped parameter thermal...
This paper analyses a kind of leaf spring ultrasonic motor (USM). A radial vibration of the stator is excited by PZT and then the radial displacement is converted to a rotation of the rotor by the bending of leaf springs. The dynamics model of the motor is firstly studied by theoretical method and then the amplitude-frequency characteristic of the stator is calculated by the Finite Element Method...
Traveling wave ultrasonic motors are driven by frictional force in the contact interface between the stator and the rotor. The operational characteristics of ultrasonic motors are determined by the contact mechanics. A quasi-analytical contact model of a ring-type traveling wave ultrasonic motor applied to the Canon autofocus lens drive system is presented here. First, the circumferential contact...
Based on the vibration modes of the cylinder stator by finite elements analysis (FEM), the kinetic model of locus is presented for the 3-DOF USM with spherical rotor and cylinder stator in this paper. The geometric locus of particles on the top of the cylinder stator, including the vibration amplitudes of two bending modes are equal to the longitudinal mode or not, has been already drawn out in theory...
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