Electromagnetic stirring apparatus

A stirring device comprising a magnetics board and a coupling board;

• said coupling board being situated below said magnetics board;
• said magnetics board having a group of coils comprising a first coil and a second coil;
• said coupling board having a first coupling piece and a second coupling piece;
• said first coupling piece having a first leg and a second leg;
• said second coupling piece having a first leg and a second leg;
• said legs of said coupling pieces extend through apertures in said magnetics board;
• said first coil containing at least a portion of said first leg of said first coupling piece;
• said second coil containing at least a portion of said first leg of said second coupling piece;
• said legs are arranged in a rectangular pattern about an axis, such that one leg is located at each vertex of said rectangular pattern;
• and
• the second leg of the first coupling piece is located diagonal across said axis from the first leg of the first coupling piece, and the second leg of the second coupling piece is located diagonal across said axis from the first leg of the second coupling piece;
• wherein said first coupling piece and said second coupling piece do not touch.

A stirring device comprising:

• a magnetics board containing at least two adjacent groups of air core coils;
• each of said groups of coils having four coils comprising a first pair of two coils and a second pair of two coils;
• each of said groups of four coils being located beside each other;
• said two coils in said first pair are wound in opposite directions and energized by a first phase of electrical power, thereby producing oppositely oriented magnetic fields;
• said two coils in said second pair are wound in opposite directions and energized by a second phase of electrical power, thereby producing oppositely oriented magnetic fields;
• and
• directly opposing coils from said adjacent groups of coils are energized by the same phase of power and produce a magnetic field oriented in the same direction.