Magnetic Field Synthesis Control Device Using Minimum Infinity-Norm Current Solution

Magnetic Field Synthesis Control Device Using Minimum Infinity-Norm Current Solution

This technology is a magnetic field synthesis control device that forms a magnetic field of a specific direction and intensity at a desired location by controlling the current applied to multiple coils. It determines the optimal current command within the rated current limit using a minimum infinity-norm current solution.

Previously, limitations in coil rated current often resulted in reduced synthetic magnetic field strength or unintended deviations in direction.

This technology proposes a method that calculates a first current command using the least squares method and a second current command that minimizes the infinity norm, determining the optimal current command within the rated current limit. This enables stable control that maximizes magnetic field synthesis performance without exceeding coil ratings. It can be utilized as a core control technology to maximize coil performance in fields requiring precise magnetic field control, such as magnetically driven microrobots, precision medical devices, and magnetic levitation systems.

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Key Features:

• Magnetic field information input unit that receives data regarding the target magnetic field intensity and direction to be generated by multiple coils
• Drive matrix calculation unit that computes a drive matrix indicating the unit current magnetic flux density of multiple coils by referencing a lookup table
• Configuration that calculates a first current command by applying the least squares method to the current solution obtained from magnetic field information and the drive matrix
• Configuration that calculates a second current command that minimizes the infinity norm among current solutions and determines the optimal current command within the rated current range