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Conventional linear machine consists of only one stator and one mover. In this paper, a permanent magnet (PM) tubular linear motor with multiple movers is proposed to improve the efficiency of stator field. The outer and inner movers can produce independent motions by interacting with the PM stator. It can be used in large systems requiring multiple driven elements and space saving. The employment...
Permanent magnet (PM) array has great influence on flux field distribution of motor. A Halbach PM array is used in the motor of this paper, which not only increases the thrust output, but also decreases the mover mass. A new analytical model for magnetic flux density in circumferential direction is proposed in this paper based on equivalent surface current method, which could solve the flux density...
A novel two degree-of-freedom (DOF) ultrasonic planar motor based on traveling wave has been proposed in this paper. The stator is the key component of the planar motor. The proposed stator is in a bar type, consisting of three piezoelectric ceramic cylinders and a metal driving head. The effective elliptical motion of the driving head tip is formed by the second bending mode and the first longitude...
A ball-joint-like three-degree-of-freedom (3-DOF) spherical actuator which features a ball-shaped rotor with multiple permanent magnet (PM) poles and a spherical-shell-like stator with air-core coils is proposed to achieve omnidirectional smooth motion in only one joint. Unlike previous study in which dihedral-shaped PMs are employed as the rotor poles, this spherical actuator takes advantage of cylindrical-shaped...
This paper presents a ball-joint-like three-degree-of-freedom (3-DOF) permanent magnet (PM) spherical actuator which features a ball-shaped rotor with multiple PM poles and a spherical iron stator with air-core coils. Torque output of this PM spherical actuator is formulated analytically. Based on the torque model, simulation result of the actuator torque variation is presented. In addition, the effect...
This paper presents a ball-joint-like three-degree-of-freedom (3-DOF) permanent magnet (PM) spherical actuator which features a ball-shaped rotor with multiple PM poles and a spherical iron stator with air-core coils. The magnetic field of the PM-pole rotor of this PM spherical actuator is formulated analytically. Simulation result of the magnetic field variation is then presented. In addition, the...
Theoretical modeling in any engineering design is of paramount importance as it provides the interrelationship between variables being analyzed in a given condition. With regards to the design of an electromagnetic spherical actuator, torque modeling is crucial as it correlates the input parameters such as current to the output mechanical torque. In this paper, a new approach in torque formulation...
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