Linear Motor Magnet

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Linear motor magnet refers to rectangular rare earth Neodymium magnet with high residual induction and coercive force used in the U-channel or flat magnet track to work as the secondary for the high performance brushless linear motor. The noncontact design of the forcer and magnet track eliminates wear and maintenance problem to ensure translational motions to be performed dynamically, with low friction, high precision and high speed. Therefore, the brushless linear servomotors are proven ideal for robots, photonics alignment and positioning, vision systems, actuators, machine tools, electronic manufacturing, semiconductor equipments, and many other industrial automation applications. There are typical manufacturers of linear motors such as Tecnotion, Parker, Siemens, Kollmorgen, Rockwell, etc.

Horizon Magnetics have accumulated much valuable experience in linear motor magnets and related magnetic assemblies like magnetic tracks. We have been concentrating on manufacturing high end Neodymium magnet material with high temperature stability and low weight loss. Moreover, our strict quality control standard ensures magnets supplied with high magnetic performance consistency to meet the application for high performance brushless linear motors.

Besides quality linear motor magnet, the precision positioning of rare earth Neodymium magnets on the magnet plate is one of important factors to directly affect the use effect of linear motors, including the output torque, working efficiency and stability of linear motors. In order to provide superior distribution of magnetic lines of force for linear motors, the space between adjacent magnets can isolate the opposite magnetic lines of force. There are main three existing magnet installation methods of magnet tracks are mainly as follows:

1. The positioning structure is processed on the base plate, and then the Neodymium magnets are installed on the base plate one by one through the positioning structure. This installation method has a disadvantage, because the base plate is magnetic material and the prominent positioning structure will affect the structure of the magnetic circuit.

2. Use the side of the base plate to position and install the first linear motor magnet, and then install the second magnet in sequence, and use the standard feeler gauge that meets the design interval in the middle to limit the installation in turn. This method has a disadvantage too because the installation positions of magnets are arranged in sequence, and accumulated errors will be generated in the process of installing each magnet in sequence, which will lead to the uneven distribution of the final magnets.

3. Make a limit plate to reserve the limit slot for magnet installation in the middle. First install the limit plate on the base plate, and then install the linear motor Neodymium magnets one by one. This method has two disadvantages: 1) in the application case of the linear motor with long stator, the limit plate is easy to warp and deform, which affects the assembly accuracy; 2) when the magnet is installed obliquely and pushed to the limited position, the front end of the magnet will be adsorbed on the base plate due to the suction force, which will rub the base plate to damage coating layer; and the glue used to fix the magnet and base plate is scraped off, which affects the fixing effect of the Neodymium linear motor magnet.

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