Dynamic Simulation of a Direct Drive Reversing Valve Based on the Hydraulic Die Forging Hammer

2016 ◽  
Author(s):  
Muzhi Zhu ◽  
Shengdun Zhao
Keyword(s):  
Permanent Magnet ◽  
Control Volume ◽  
Linear Motor ◽  
Field Analysis ◽  
Magnetic Flux Density ◽  
Direct Drive ◽  
Force Analysis ◽  
Fluid Force ◽  
Die Forging ◽  
Permanent Magnet Linear Motor

The direct drive reversing valve is designed in this paper to replace the main reversing valve of the hydraulic die forging hammer system, and a new drive method based on TPMLM (tubular permanent magnet linear motor) is suggested. To verify the feasibility of the drive method, the fluid force suffered by valve core is calculated by using control volume method. After that, force analysis is carried out on the valve core. Based on FLUENT, the flow field analysis inside the valve is conducted. And then theoretical calculation and simulation on the fluid force analysis are discussed. TPMLM (tubular permanent magnet linear motor) is selected as the driving device and it is analyzed by Maxwell 2D. The simulation results of TPMLM show that the magnetic flux density, back electromotive force and output force satisfy the requirement of the reversing valve.

Cogging Force Analysis of Moving Magnet Type Permanent Magnet Synchronous Linear Servo Motor

2015 ◽  
Vol 741 ◽  
pp. 663-668
Author(s):  
Zhi Gang Shen ◽  
Qing Wang ◽  
Qing Jie Sun ◽  
Hong Xing Wu
Keyword(s):  
Permanent Magnet ◽  
Structural Characteristics ◽  
Linear Motor ◽  
Middle Part ◽  
Servo Motor ◽  
Direct Drive ◽  
Force Analysis ◽  
Detent Force ◽  
Maximum Value ◽  
Moving Magnet

Linear motor eliminates the middle part of mechanical drive train, but because of structural characteristics of itself, must to take effective measures to reduce thrust fluctuations, or direct drive will lost its original meaning. In this paper, firstly research on detent force of moving magnet type permanent magnet synchronous linear servo motor and analyze the principle of generate detent force, secondly analyze the cogging force of moving magnet type permanent magnet synchronous linear motor and obtain the expression of cogging force maximum value, finally propose effective method to reduce detent force.

Permanent Magnets Design and Magnetic Field Analysis of a Novel Permanent Magnet Linear Motor

2012 ◽  
Vol 569 ◽  
pp. 356-362
Author(s):  
Gong Zhang ◽  
Zhan Gong Xie ◽  
Xian Shuai Chen ◽  
Xue Feng Zhou
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Linear Motor ◽  
Field Analysis ◽  
Air Gaps ◽  
Magnetic Field Analysis ◽  
Output Force ◽  
Array Structures ◽  
Permanent Magnet Linear Motor

In order to improve the output force characteristics of permanent magnet linear motor (PMLM), studied from permanent magnets (PMs) structure that is the key component of PMLM, different magnetization methods of single PM and different array structures of multiple PMs are compared, and a novel PMLM magnetized alone the external field force lines using 8 pieces tegular Halbach magnet array with air gaps is proposed as well. The analysis on magnetic field of PMLM shows that the force between the coil and the single PM increases by more than 40%, and the average magnetic induction in coil centre generated by the 8 pieces Halbach magnet array arrives at the maximum value, 10% higher than that of 1 piece structure.

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