Linear Motor Direct Drive Key Technology Problems and the Solution Countermeasures

2013 ◽  
Vol 411-414 ◽  
pp. 3052-3055
Author(s):  
Yao Bin Hu ◽  
Jing Xie ◽  
Liang Bin Hu
Keyword(s):  
High Speed ◽  
Supply Voltage ◽  
Linear Motor ◽  
Direct Drive ◽  
Key Technology ◽  
Linear Motors ◽  
Magnetic Attraction ◽  
Working Principle ◽  
And Performance ◽  
Gravity Acceleration

Linear motor direct drive with the advantages of simple structure, fast dynamic response, high precision, high speed, big acceleration, small noise and vibration, is the ideal transmission for all kinds of ultra-high speed and precision machine tool. This paper introduces the working principle and performance features of linear motors, and elaborates on the key technology problems and the solution countermeasures of seven aspects including the efficiency and the power factor, the cooling measure, the normal magnetic attraction, the servo-control, magnetism isolation and the protection, the gravity acceleration and the supply voltage of the linear motor.

Linear motor drive ultrahigh-speed injection moulding machine

2002 ◽  
Vol 216 (5) ◽  
pp. 773-781 ◽  
Author(s):  
Y-B Bang ◽  
S Ito
Keyword(s):  
Contact Force ◽  
Injection Moulding ◽  
High Speed ◽  
Linear Motor ◽  
Total Output ◽  
Inertia Force ◽  
Motor Drive ◽  
Direct Drive ◽  
Linear Motors ◽  
Moulding Machine

This paper presents a report on the development of a linear motor drive injection moulding machine for the attainment of ultrahigh-speed injection moulding. Until now it has been impossible to produce such a high speed with all-electric injection moulding machines, although the need for such ultrahigh-speed, electrically driven injection moulding machines has clearly existed. However, direct drive by linear motors may cause brief nozzle separation from the sprue bushing because of an inertia force as large as the total output thrust of the linear motors, and this momentary separation can cause molten plastic leakage. In this paper, two solutions are proposed for this inertia force problem. One is mechanical cancellation of the inertia force, the other is an increase in the nozzle contact force. Furthermore, a new nozzle contact mechanism is proposed that prevents the stationary platen bending caused by the nozzle contact force. Some experimental results on a manufactured all-electric, ultrahigh-speed injection moulding machine are presented.

Application of Linear Servo Motor in Biochip Microarray Instrument

2013 ◽  
Vol 321-324 ◽  
pp. 795-798
Author(s):  
Quan Liu ◽  
Qiao Qiao Liu ◽  
Xiao Fei Wang ◽  
Xue Zhao
Keyword(s):  
High Speed ◽  
Ball Screw ◽  
Servo Motor ◽  
Direct Drive ◽  
Improve Performance ◽  
Positioning Accuracy ◽  
Linear Motors ◽  
Rotary Motors ◽  
Automation Control ◽  
Novel Design

A novel design to biochip microarray instrument is use of linear motors, in preference to conventional rotary motors driving ball screw. Three ironless core linear servo motors direct drive the X, Y and Z-axis motion, Improve performance such as superior positioning accuracy, high-speed operation and increased efficiency. The whole configuration for new microarray printing instrument is designed. Furthermore, the structure of special linear motors is also designed detailedly. And the linear servo motor automation control technology is introduced in this paper.

Motion control of a two-axis linear motor-driven stage in the micro-milling process

2016 ◽  
Vol 232 (1) ◽  
pp. 65-76
Author(s):  
Mohammad S Heydarzadeh ◽  
Seyed M Rezaei ◽  
Noor A Mardi ◽  
Ali Kamali E
Keyword(s):  
Kalman Filter ◽  
High Speed ◽  
Linear Motor ◽  
Degree Of Freedom ◽  
Micro Milling ◽  
Proportional Integral Derivative ◽  
Direct Drive ◽  
Proportional Integral Derivative Controller ◽  
Proportional Integral ◽  
Two Degree Of Freedom

The application of linear motor-driven stages as the feed drivers of CNC micro milling machine tools is growing. In addition to employ high speed and high precision equipment such as linear motor-driven stages, the precision of the machined contours is highly dependent on the capabilities of the servo controllers. In this paper, the design of a precise controller for a two-axis LMDS has been investigated for micro-milling applications. In such feed drives, disturbances such as friction, force ripples, and machining forces have adverse effects on the workpiece positioning precision due to the direct drive concept behind them. Therefore, in order to have an acceptable transient response and disturbance rejection properties, a two-degree-of-freedom proportional–integral–derivative controller was employed for each axis. To design this controller, the zero-placement method was used. To compensate disturbances and machining contour errors, the utilization of Kalman filter observers, neural networks, cross-coupled controllers, and different integration of them were studied. The controllers were experimentally examined for circular motions. An integrated controller consisted of a Kalman filter disturbance observer, a cross-coupled controller, and a well-designed two-degree-of-freedom proportional–integral–derivative controller resulted in a high contouring and tracking precision. The controller could also reduce the spikes caused by the friction at the motion reversal points such as the quadrants in circle trajectories.

Research and Development of a Test Platform for Synthetic Performance Parameters of Linear Motors

2011 ◽  
Vol 383-390 ◽  
pp. 4486-4491
Author(s):  
Zhong Quan Luan ◽  
Hu Yan Ji ◽  
Qing Dong Yang
Keyword(s):  
Research And Development ◽  
High Precision ◽  
Virtual Instrument ◽  
High Speed ◽  
Linear Motor ◽  
Cnc Machine Tools ◽  
Performance Parameters ◽  
Cnc Machine ◽  
Linear Motors ◽  
Test Platform

Linear Motors have been used more and more widely in high precision and high-speed linear motion for CNC machine tools, but uniform testing standards and methods for linear motor performance have not been established in China. Based on the virtual instrument software platform by means of computer technology, research and development of the test platform for synthetic performance parameters of linear motors can realize the rapid and accurate measurement, automatic storage and processing of linear-motor output, currents, positions, temperatures and other performance parameters. , Meanwhile, the platform can also provide the technical direction for design or improvement of linear motors, and technically support the formulation of related standards. Experiments showed that the test platform for synthetic performance parameters of linear motors can achieve high precision and automatic measurement to meet the testing requirements for synthetic performance of linear motors.

Research on Web Data Mining Based on Topic Crawler

2021 ◽  
Author(s):  
Hongjian Guo
Keyword(s):  
Data Mining ◽  
Information Search ◽  
Mining System ◽  
Key Technology ◽  
Web Information ◽  
The World ◽  
Working Principle ◽  
Data Mining System ◽  
Implementation Method ◽  
And Performance

This paper analyzes the method of Web information data mining based on topic crawler. This paper puts forward the architecture of Web information search and data mining, and introduces the key technology and operation principle of the architecture. After analyzing the functions and shortcomings of ordinary crawler, this paper focuses on the working principle, implementation method and performance analysis of this crawler, as well as the functions of this crawler different from other crawlers and its application in Web information search and data mining system. The experimental results show that the crawler can get all kinds of information resources on the world wide web, which is helpful to the monitoring and management of network cultural content.

DD-type Linear Motor Systems and Their Applications

1989 ◽  
Vol 1 (4) ◽  
pp. 328-332
Author(s):  
Tamotsu Suzuki ◽  
Keyword(s):  
Motor Development ◽  
Linear Motor ◽  
Drive System ◽  
Industrial Robots ◽  
Added Value ◽  
Direct Drive ◽  
Positioning Systems ◽  
Factory Automation ◽  
Linear Motors ◽  
Linear Drive System

Carrying and positioning systems for linear movement in factory automation are typically a combination of a motor and motion-translating mechanisms, such as ball screws, belts, and racks and pinions. Such mechanical motion-translating mechanisms, however, have the disadvantages of limited accuracy, speed, and durability. As a solution to this problem, direct-drive linear motors, which drive an object directly mounted on the drive section, have attracted considerable interest, and various types of linear motors have been actually used. The recent trend in linear motor development has been such that the functions of the motor alone have been expanded into higher functions of the linear drive system. The ""Megathrust Motor"" is a direct drive linear actuator system developed by Nippon Seiko K.K. It has some components, such as a detector and drive unit, which are different from those of other drive systems, and therefore provide high performance and added value. Nippon Seiko K.K. has also developed and marketed a direct drive ""Megatorque Motor."" This motor has achieved high speed and highly accurate rotational drive of industrial robots and general industrial machines, and has been widely used as a rotary actuator in factory automation. The Megathrust Motor is a linear drive system developed as an application of the technology of the Megatorque Motor. This paper describes the features, performance, and applications of the Megathrust Motor.

Key Techniques and Performance Analysis of Solar Electric Automobile

2013 ◽  
Vol 846-847 ◽  
pp. 139-143
Author(s):  
Ding Yue Chen ◽  
Li Hao Chen ◽  
Jian Chao Bao ◽  
Zhao Guo ◽  
Feng Tian
Keyword(s):  
Environmental Pollution ◽  
Electric Vehicles ◽  
Basic Structure ◽  
Energy Crisis ◽  
Future Research ◽  
Key Technology ◽  
Electric Automobile ◽  
Working Principle ◽  
And Performance ◽  
Key Techniques

The energy crisis and environmental pollution are two big problems that today's world facing. Solar electric automobile will have great significance for solving the energy crisis and environmental pollution. This article from the main advantages of solar electric vehicles start, elaborated the basic structure, working principle, key technology and the problem need to solve of solar electric vehicle, to provide reference for the future research and development.

Design and Analysis of a High Efficient Multi-Segment Redundancy Linear Motor

2020 ◽  
Vol 13 ◽  
Author(s):  
Chunyuan Shi ◽  
Jingang Jiang ◽  
Lei Wang ◽  
Wei Pan ◽  
Zili Tang ◽  
...  
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Linear Motor ◽  
Normal Direction ◽  
Magnetic Flux Density ◽  
Iron Core ◽  
Linear Motors ◽  
High Efficient ◽  
The One ◽  
Direction Component

Background: The electromagnetic aircraft launch system is used to assists the carrier aircraft to accelerate takeoff on a short distance on the flight deck. Linear motors are required to have high efficiency and thrust / volume ratio, as the actuator of the EMALS. In addition, linear motors were required have the fluctuation of the thrust is as small as possible to prevent impact and overstress on the airborne equipment. The thrust performance and thrust fluctuation suppression of linear motors are the current research hotspots in the field of EMALS. Objective: To improve the efficiency of the system, this paper proposes a multi-segment LPMSM. Methods: We design a decentralized primary structure based on the Autonomous Decentralized System (ADS) concept. Only the coils near the moving secondary are motivated during the launch process, the others could be released from being driven after the secondary slide over; this control will save the waste of energy. Results: A multi-segment linear motor is proposed to improve the efficiency of the EMALS. This motor consists of two sections - the one with iron core for the low speed process and the one without iron core for the high speed process. Conclusion: The normal direction component of the air gap magnetic flux density is much larger than that of the longitudinal component, and their values are 80-90% and 10-20% respectively. For the normal direction component, it is mainly affected by the third, seventh, and ninth harmonics. The accelerating and energy test results show that, in the accelerating process, the efficiency of the linear motor can be more than 90%, and the acceleration is stable.

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