Yesterday we have talked about the internal factors affecting the magnetic force, today we will discuss the external factors.
- The impact of the applied current value on the magnetic force
In the electro-permanent magnets, size and other conditions are inevitable; only change in the value of the loading current can be derived from the charging current on the magnetic force rules: when not energized, RbFeB permanent magnets have a particular attraction to the mold, at this time the magnetic induction line and magnetic induction intensity line of permanent magnets are not controlled by the current, is a natural state; when the coil is energized, the magnetic field of the original Alnico magnet and RbFeB magnet magnetic field direction, with As the current strength increases, the magnetic force gradually increases.
- The influence of the thickness of the air layer on the magnetic force
In the electro-permanent magnetic pole size and other conditions, you can change the thickness of the air layer to get the relationship between the thickness of the air layer and the magnetic pole force. The thickness of the air layer is the gap between the contact surface of the electro-permanent magnet and the mold. As the magnetic field is radiating, the further away from the RbFeB permanent magnet, the weaker the magnetic induction. The adsorption force of the electro-permanent magnet will rapidly decrease as the thickness of the air layer increases. Tests have shown that when the thickness of the air layer is 2 mm, the adsorption force of the EPM chuck drops to 40.9 N/ cm², which is insufficient to meet the mold’s clamping requirements.
The thickness of the air layer and the value of the applied current has the most significant influence on the adsorption force of the magnetic poles. Changing the geometrical parameters of the magnetic poles also results in different magnetic field strength distributions and magnetic adsorption forces. In practice, We should optimally determine the optimum design parameters of the magnetic poles by combining the requirements of use and the geometrical parameters of the magnetic pole structure.
HVR aims to provide our customers with the most competitive lifting magnets. If you’re interested in it, please feel free to contact us.
