The typical spindle motor is designed to maximise a torque which spins the rotor. The present paper shows how an additional radial force can be generated using the spindle ordinary components (like the magnet and the stack) and by adding a second winding or tapping the motor winding. The most common configurations of slotted motor in term of pair of pole number and slot number have been studied. Tables describe the configurations compatible with windied. Tables describe the configurations compatible with windings generating torque and/or radial force. Solutions to supply this additional radial force winding are also presented: these solutions calculate the currents that must flow through the winding phases to generate the wanted radial force, which is given by its 2 Cartesian components. Finally, an experimental set-up is presented: the developed actuator is used to generate a rotating radial force excitation in a disc drive application. The measured spindle response is a gyroscopic motion of the spin axis of the motor. The comparison of this measured response to the theoretical response proves the well functionment of the developed actuator. This measurement also allows an accurate adjustment of the radial force direction.
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