scholarly journals An Extended Model for Ripple Analysis of 2–4 Phase Resonant Electrostatic Induction Motors

Actuators ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 291
Author(s):  
Fernando Carneiro ◽  
Guangwei Zhang ◽  
Masahiko Osada ◽  
Shunsuke Yoshimoto ◽  
Akio Yamamoto
Keyword(s):  
Analytical Model ◽  
Induction Motors ◽  
Thrust Force ◽  
Motor Behavior ◽  
Extended Model ◽  
Electrostatic Induction ◽  
Simplified Method ◽  
Motor Outputs ◽  
Robotic Devices ◽  
Force Ripple

Electrostatic motors are promising forms of actuation for future robotic devices. The study of their different implementations should accelerate their adoption. Current models for resonant electrostatic induction motors were found not to be able to properly describe their behavior, namely, with regard to changes with position. This paper reports a new analytical model for these motors, aiming to address this issue. The model is based on identification of all capacitance harmonics, through a simplified method. Using these, equations for different motor parameters, notably, thrust force, were obtained and compared to previous literature. The new equations model position dependent properties, such as force ripple. The outputs of this model were validated through experimentation with a prototype, with the results confirming the new model better describes motor behavior. An analysis into how to decrease this ripple was also discussed and tested. We concluded that the use of a higher number of harmonics resulted in a much more accurate model, capable of adequately characterizing motor outputs with changes in position.

Cauchy problem for an extended model of combustion

1992 ◽  
Vol 120 (3-4) ◽  
pp. 349-360 ◽  
Author(s):  
Yun-guang Lu
Keyword(s):  
Cauchy Problem ◽  
Existence Results ◽  
Young Measures ◽  
Weak Continuity ◽  
Finite Limit ◽  
Extended Model ◽  
Lipschitz Continuous ◽  
Simplified Method ◽  
The Cauchy Problem ◽  
Definition Of

SynopsisThis paper considers the Cauchy problem for an extended model of combustion (u + qz)t + f(u)x = 0, zt + kg(u)z = 0 with Lp bounded initial data, where g(u) is a piecewise Lipschitz continuous function and its discontinuous points have no finite limit point. The integral representation gives a definition of a weak solution in Lp space. Some existence results are obtained based on a simplified method of compensated compactness in which the weak continuity theorem of 2 * 2 determinants plays a more important role, but the idea of Young measures has been avoided.

A New Linear Double Salient Permanent Magnet Motor with Complementary Winding

2013 ◽  
Vol 416-417 ◽  
pp. 115-120
Author(s):  
Ming Cheng ◽  
Rui Wu Cao ◽  
Wei Hua ◽  
Xin Wang
Keyword(s):  
Permanent Magnet ◽  
Thrust Force ◽  
Urban Rail Transit ◽  
Static Characteristics ◽  
Permanent Magnet Motor ◽  
Linear Motors ◽  
Urban Rail ◽  
Fair Comparison ◽  
Force Ripple ◽  
Novel Structures

In this paper, two novel structures of linear double salient permanent magnet (LDSPM) motor having magnets and armature windings in primary are proposed and compared. Firstly, the design principles of both motors are presented. Then, for a fair comparison, two motors are designed based on the same primary dimensions including the slot area, teeth number, pole pitch, permanent magnet volumes and coils number per phase, while the stator pole pitch and the primary structure are different. Finally, the configurations and static characteristics of both motors are critically compared based on finite element (FE) analysis. The results indicate that the proposed topology can avoid the asymmetry of back-EMF waveforms and reduce cogging force and thrust force ripple. Also, the proposed primary permanent magnet linear motors are suitable for the longer stator application such as urban rail transit (URT).

Design of a Hot Gas Vane Motor

2004 ◽  
Author(s):  
Bo Li ◽  
Eric J. Barth ◽  
Kevin B. Fite ◽  
Michael Goldfarb
Keyword(s):  
Analytical Model ◽  
Conversion Efficiency ◽  
Motor Performance ◽  
Motor Behavior ◽  
Maximum Amount ◽  
Output Energy ◽  
Working Fluid ◽  
Direct Drive ◽  
Hot Gas ◽  
Insight Into

This paper describes the design of a hot gas vane motor. The motor is intended as a portable direct drive actuator powered by a hot gaseous working fluid as an alternative to battery-powered electromagnetic motors. The objective is thus to convert a maximum amount of enthalpy at the inlet into mechanical rotational output energy in a compact and lightweight package. The described motor incorporates a non-circular stator shape and a geometry of injection and exhaust ports to maximize conversion efficiency. An analytical model is developed to describe the torque output and efficiency of the motor. Simulations are performed to provide insight into the motor behavior and characterize the expected motor performance.

An Analytical Model Predicting Fixed Index Assembly Machine Performance

1972 ◽  
Vol 94 (2) ◽  
pp. 419-424
Author(s):  
W. B. Heginbotham ◽  
G. E. Rippon
Keyword(s):  
Mathematical Model ◽  
Analytical Model ◽  
Digital Computer ◽  
Matrix Operator ◽  
Operator Technique ◽  
Machine Performance ◽  
Simplified Method ◽  
The Matrix ◽  
Operating Methods

A simplified method of analyzing the performance of fixed index assembly machines using the matrix operator technique is described. This method can be used widely for exploring the effects of operating methods for assembly machines, and an example is quoted where each workhead has a different reliability. By using a digital computer, an exact mathematical model can be built which will enable studies to be made about machine performance when all the head parameters and method of operation are different for each individual head.

INTEGRATED DRIVE FOR CONTACT-FREE FULL ROTATION AND ITS NOVEL POSITIONING METHODOLOGY

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1871-1876
Author(s):  
KWANG SUK JUNG ◽  
SANG HEON LEE
Keyword(s):  
Induction Motors ◽  
Thrust Force ◽  
Axial Vector ◽  
Air Gap ◽  
Degree Of Freedom ◽  
Rotating System ◽  
Precision Stage ◽  
Positioning Method ◽  
Full Rotation ◽  
Contact Free

To expand an inevitably limited rotating range of the existing planar precision stage, we suggest a revolving stage driven by three-separate axial type of transverse flux induction motors spaced 120° apart. It is a non-contact integrated rotating system that uses three-axial vector forces such as normal and thrust force of each motor. In this paper, the primary principles capable of realizing such a contact-less revolving stage are reviewed and compared, with results that seem to confirm the main principles of the suggested system. And then, the positioning method with only the air-gap measurements covering full degree of freedom is presented, compared with that of existing stages.

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