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This paper analyzes the electromagnetic forces acting on the coaxial magnetic gear (CMG). The vibration and noise of CMG result from exciting forces acting on three parts namely low-speed rotor, high-speed rotor and modulating pieces (MPs), respectively. The forces acting on three parts of CMG are calculated. Also, these force frequencies are analyzed. The influence of forces on vibration and noise...
The hybrid excitation magnetic gear having the AC excitation and PM excitation is very useful in transmission system because it can operate with continuously variable gear ratio. But, the harmonic characteristics of flux density in hybrid excitation magnetic gear are different to those of PM excitation magnetic gear. Thus, these magnetic gears are compared in terms of the harmonic characteristics...
Magnetic transmission has the advantages of non-contact transmission, no friction, and noise or vibration weak. In 2001, D. Howe proposed a field modulated magnetic transmission, which has higher torque density and higher gear ratio than the conventional magnetic transmission[1]. Moreover, The existing transmission mainly focuses on single degree of freedom movement. In this paper, a novel high-performance...
Similar to combustion engines comprising multiple cylinders engaged with a crankshaft, multiple piezoelectric stack actuators (PSA) engaged with a common output rod can produce smooth, long stroke motion with desired properties. In particular, when equally spaced multiple units are arranged to push sinusoidal gear teeth on the output rod, the system exhibits unique collective behaviors thanks to “harmonic”...
Capacitive actuators, such as piezoelectric stack actuators, provide an efficient solution for robotic and mecha-tronic systems that typically require large forces and minimal velocities over long periods of time. To overcome the stack actuator's limitations, particularly their limited stroke, a harmonic poly-actuator design is presented. This design utilizes a multitude of intermediate buckling amplification...
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