Dynamic Analysis of Moving magnet linear actuator using end ferromagnetic poles

Linear actuators are electromechanical devices which provide bidirectional motion in a single axis for a specific load without any screws, gears, or crankshafts. The stator, actuator?s stationary part, generates a controlled electromagnetic energy. This energy is transformed into mechanical work by

Project Title

Dynamic Analysis of Moving magnet linear actuator using end ferromagnetic poles

Project Area of Specialization

Shared Economy

Project Summary

Linear actuators are electromechanical devices which provide bidirectional motion in a single axis for a specific load without any screws, gears, or crankshafts. The stator, actuator’s stationary part, generates a controlled electromagnetic energy. This energy is transformed into mechanical work by displacing the armature (moving part) to the position where the magnetic flux faces the least reluctance.

The problem is that the present Moving Magnet Linear Actuators (MMLA) is designed using rare earth permanent magnet (Neomax), Permanent magnet (Neomax) is very expensive as compared to ferrite magnet. Due to this high price of permanent magnet, all the equipment’s using MMLA is quite expansive like refrigerators compressor etc. Therefore, alternate solution to above mentioned obstacle is required.

       In order to replace the Neomax permanent magnet, the suggested solution is ferrite magnet in Halbach arrangement. The reason behind doing this is that ferrite magnet is easily available and exhibit less cost than that of Neomax permanent magnet. The ferrite magnet will be placed in the proposed project in Halbach arrangement to get the expected high thrust force. By using this ferrite magnet, the price of MMLA will be decreased automatically, further reduce the cost of equipment.

MMLA are used in wide range of applications including manufacturing, automation, biomedical, robotics, aerospace, transportation and refrigerators linear compressors.

Linear actuators are electromechanical devices which provide bidirectional motion in a single axis for a specific load without any screws, gears, or crankshafts. The stator, actuator’s stationary part, generates a controlled electromagnetic energy. This energy is transformed into mechanical work by displacing the armature (moving part) to the position where the magnetic flux faces the least reluctance.

The problem is that the present Moving Magnet Linear Actuators (MMLA) is designed using rare earth permanent magnet (Neomax), Permanent magnet (Neomax) is very expensive as compared to ferrite magnet. Due to this high price of permanent magnet, all the equipment’s using MMLA is quite expansive like refrigerators compressor etc. Therefore, alternate solution to above mentioned obstacle is required.

       In order to replace the Neomax permanent magnet, the suggested solution is ferrite magnet in Halbach arrangement. The reason behind doing this is that ferrite magnet is easily available and exhibit less cost than that of Neomax permanent magnet. The ferrite magnet will be placed in the proposed project in Halbach arrangement to get the expected high thrust force. By using this ferrite magnet, the price of MMLA will be decreased automatically, further reduce the cost of equipment.

MMLA are used in wide range of applications including manufacturing, automation, biomedical, robotics, aerospace, transportation and refrigerators linear compressors.

Project Objectives

Following are the main objectives of the proposed Project.

• To design the structure of Moving Magnet Linear Actuator having end ferromagnetic poles pieces using Halbach surface.
• To analysis the function of suggested Moving Magnet Linear Actuator using COMSOL and evaluate efficiency, losses, cost and weight of machine for better performance.
• To fabricate proposed Moving Magnet Linear Actuator and analyze machine performances experimentally.

By accomplishing the above-mentioned objectives, the manufacturing cost of MMLA will be reduced. It will further reduce the cost of equipment’s. The cost of permanent magnet plays an important role in machines manufacturing, while controlling this parameter on industrial scale contributes much in industrial development and economic growth of country.

Project Implementation Method

The implementation of our project consists of the following two parts.

1. Simulation
2. Hardware

For the simulation purpose COMSOl software will be used. In COMSOL the proposed Moving Magnet Linear Actuator will be designed which is composed of Core, Armature windings, Halbach array, Coils, Springs, Piston etc. Results obtained from the proposed (MMLA) by the COMSOL will be compared with the existing Topology. 

In the next step hardware for MMLA will be designed. It consists of three major parts.

1. The linear actuator.
2. The spring assembly.
3. The air/gas compression chamber.

Both the simulation and hardware results will be compared for further implementation in the compressor of Refrigerator.

Benefits of the Project

The problem arises due to the use of rare earth permanent magnet (Neomax) in Moving Magnet Linear Actuator is that its cost become very high although its performance is good. In the proposed model improved   tubular Halbach surface permanent magnet with end ferromagnetic poles pieces is used, which is cheaper then rare earth permanent magnets.

Generally, the end magnets rings are exposed to air due to the inherent opening structure of Linear Oscillating Actuator, resulting in a rather larger reluctance of end air gap and a lower air-gap ?ux density. Therefore, the analysis of the end air gap is of great signi?cance for the Linear Oscillator Actuators (LOA) performance. Considering this fact, the ferromagnetic pole pieces are added at both the end, so the support tube of LOA, trying to direct the magnetic ?elds in desired paths and enhance the electromagnetic performance of LOA. Two Halbach Surface Mounted Permanent Magnet (HSPM) LOAs with ferromagnetic and without ferromagnetic pole pieces will be simulated, built and tested. It is expected that the electromagnetic performance of the proposed design is superior to the original. Moreover, its cost become economical. The proposed design plays a signi?cant role in enhancing LOA performance and ef?ciency

Technical Details of Final Deliverable

It is expected that the proposed Moving Magnet Linear Actuator will achieve high thrust force, which is essential for the smooth operation of compressor of Refrigerator. Halbach arrangement of ferro magnet pieces will reduce the cost of proposed Moving Magnet Linear Actuator on industrial scale.  Moving Magnet Linear Actuator ensures to provide the energy efficiency and increased resources with in the country as well as around the globe. This development will simulate the economic growth.                 

Final Deliverable of the Project

Hardware System

Type of Industry

Energy , Manufacturing

Technologies

Shared Economy, Others

Sustainable Development Goals

Decent Work and Economic Growth, Industry, Innovation and Infrastructure

Required Resources

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