Patent ID: 7173507

Claim:
A magnet coil system for contactless movement of a magnetic body in a three-dimensional working space, comprising: fourteen individually drivable coils that are designed to produce three magnetic field components B x , B y and B z as well as five magnetic field gradients selected from the gradient matrix: ( â…† B x â…† x â…† B y â…† x â…† B z â…† x â…† B x â…† y â…† B y â…† y â…† B z â…† y â…† B x â…† z â…† B y â…† z â…† B z â…† z ) the gradient matrix having a diagonal with three gradients on the diagonal, each gradient on the diagonal having a gradient element pair formed from two off-diagonal gradients, which are symmetrical with respect to the gradient on the diagonal, the matrix having three gradient element pairs, the five magnetic field gradients being two of the three gradients on the diagonal, and three off-diagonal gradients, one off-diagonal gradient from each of the three gradient element pairs.