Patent attributes
The disclosed device includes a single electric motor for linear and rotary movement with a stator. The stator includes a multi-phase coil arrangement with a plurality of coils or coil sets and a rotor. The rotor is movable in an axial direction of a rotational axis thereof and includes a plurality of poles respectively with at least one permanent magnet The device further includes a control unit operative to determine currents (Ir, Is, It) by calculation formulas and based on at least a number of coils or coil sets of the plurality of coils or coil sets, and an angle of rotation of said rotor and a parameter depending on an axial position of the rotor. Each current (Ir, Is, It) has a current component (IrΦ, IsΦ, ItΦ) for generating a torque and a current component (Irx, Isx, Itx) for generating an axial force, and to supply the determined currents in open loop to the number of coils or coil sets, so that the sum of the currents is zero. Further, at least one of the stator and the rotor, includes a back-iron.
