As shown in the schematic block diagram of FIG. 2, the system 20 includes a controller 32 configured to monitor a position of the rotor 24 relative to the stator poles 29. For example, in some embodiments, the controller 32 monitors the radial position of the rotor 24, and/or the position of the drive axis 26 relative to the central axis 30. In some embodiments, the controller 32 is configured to monitor one or more electrical characteristics of the stator windings 28 in order to determine the radial position of the rotor 24 relative thereto. The one or more electrical characteristics may include, for example, a resistance or an inductance. For example, one of the stator poles 29 may experience a reduced reluctance when the rotor 24 is moved radially closer to that one of the stator poles 29. Such a reduced inductance can then be detected by the controller 32 as a change in the one or more electrical characteristics of the stator winding 28 or windings 28 associated with that one of the stator poles 29.