scholarly journals Dynamic characteristics of a bitable linear actuator with moving permanent magnet

2004 ◽  
Vol 1 (2) ◽  
pp. 207-214 ◽  
Author(s):  
Ivan Yatchev ◽  
Krastio Hinov ◽  
Vultchan Gueorgiev
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Dynamic Characteristics ◽  
Electromagnetic Force ◽  
Electrical Circuit ◽  
Field Analysis ◽  
Linear Actuator ◽  
Grid Data ◽  
Magnetic Field Analysis ◽  
The Magnetic Field

The dynamic characteristics of an ax symmetrical linear actuator with axially magnetized moving permanent magnet are obtained using combined field and circuit approach. The magnetic field of the actuator has been analyzed using the finite element method over a current-displacement sampling grid. Two field analyses are carried out for each point of the grid - one for the real system and one for the system where the permanent magnet is considered as a soft magnetic body. For each point of the grid, data for the total flux linkage, electromagnetic force and the coil inductance are extracted from the magnetic field analysis. These data are approximated by bicubic spline functions, which are employed in the solution of the system of ordinary differential equations of the electrical circuit and the mechanical motion. Results are obtained for the time variations of the coil current, mover displacement, mover velocity and electromagnetic force. The results for the current and displacement are verified experimentally.

Magnetic Field Analysis of Surface-Mounted Permanent-Magnet Motors

2011 ◽  
Vol 52-54 ◽  
pp. 285-290
Author(s):  
Yi Chang Wu ◽  
Feng Ming Ou ◽  
Bo Wei Lin
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Magnetic Circuit ◽  
Circuit Model ◽  
Field Analysis ◽  
Permanent Magnet Motors ◽  
Element Analysis ◽  
Magnetic Field Analysis ◽  
Field Estimation ◽  
The Magnetic Field

The prediction of the magnetic field is a prerequisite to investigate the motor performance. This paper focuses on the magnetic field estimation of surface-mounted permanent-magnet (SMPM) motors based on two approximations, i.e., the magnetic circuit analysis and the finite-element analysis (FEA). An equivalent magnetic circuit model is applied to analytically evaluate the magnetic field of a SMPM motor with exterior-rotor configuration. The two-dimensional FEA is then applied to numerically calculate the magnetic field and to verify the validity of the magnetic circuit model. The results show that the errors between the analytical predictions and FEA results are less than 6%. It is of benefit to further design purposes and optimization of SMPM motors.

A Novel Active Online Electromagnetic Balancing Method—Principle and Structure Analysis

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Shilei Ma ◽  
Shiyuan Pei ◽  
Lin Wang ◽  
Hua Xu
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Force ◽  
Magnetic Force ◽  
Cutting Tools ◽  
Field Analysis ◽  
Iron Core ◽  
Machining Processes ◽  
Magnetic Field Analysis ◽  
Precision Finishing ◽  
The Magnetic Field

Vibrations caused by the imbalance of a rotor are a frequently encountered problem in machining processes. Especially in high-precision finishing, the workpiece quality is strongly related to the vibration of the machine-tool spindle, which is mainly caused by mass imbalance and cannot be completely eliminated in cutting tools with nonaxisymmetrical structures. An imbalance in centrifugal force is generated by rotor rotation and increases rapidly with rotational speed. A novel active online electromagnetic balancing method based on static magnetic-field analysis is proposed, and an active online electromagnetic balancing device (AOEBD) based on this method was developed under these conditions. The magnetic-field distribution and electromagnetic force generated by the device were analyzed by finite-element modeling. The influence on the electromagnetic force of the misalignment between the rotor and the iron core was investigated. Factors influencing the magnetic force of the device were determined, and reasonable reference values were suggested. The critical eccentricity was also provided. Experiments had been done at last, and the experimental results presented a good performance of this kind of balancing device.

Hybrid Synchronous Motor Magnetic Field Analysis

2015 ◽  
Vol 792 ◽  
pp. 26-32
Author(s):  
Elena E. Suvorkova ◽  
Yuriy N. Dementiev ◽  
Lev K. Burulko
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Synchronous Motor ◽  
Field Analysis ◽  
Permanent Magnet Motor ◽  
Magnetic Field Analysis ◽  
Hybrid Motor ◽  
The Magnetic Field ◽  
Starting Torque ◽  
Made In

This paper introduces researching results of hybrid synchronous motor rotor permanent-magnet part magnets’ magnetization influence on its starting torque. The magnetic field analysis is made in reluctance synchronous motor and synchronous permanent-magnet motor, as main parts of the hybrid motor.

Magnetic Field Analysis of Surface-Mounted Permanent Magnet Motors Using Schwarz-Christoffel Mapping

2012 ◽  
Vol 466-467 ◽  
pp. 940-945
Author(s):  
Xiao Hui Lu ◽  
Jian Hong Liang
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Field Analysis ◽  
The Finite Element Method ◽  
Permanent Magnet Motors ◽  
Basic Tool ◽  
Magnetic Field Analysis ◽  
Optimizing Design ◽  
And Performance ◽  
The Magnetic Field

The paper presents the magnetic field distribution from the armature winding currents in the slotted air gap of surface-mounted permanent magnet (SMPM) motors using the Schwarz- Christoffel(SC) mapping. With the method, a slotted structure of SMPM motors is transformed into a geometrically simpler domain. Compared with the result from the finite element method, the accuracy of the method is verified. The presented work can be a basic tool for optimizing design and performance analysis of permanent magnet motors.

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