drive current waveform is in phase with the signal sensed by sensing coil 32 when the torquer drive current is applied to coil 34 which is formed with a plurality of loops a positive torque will be applied to rotor 22 to precess rotor 22 about the x axis towards the null position lying in the same plane as coil 34 it is important in understanding this invention to recognize that for any displacement of the actual spin axis of rotor 22 from the null spin axis 28 the phase and magnitude of the signal induced in sensor 32 is used to provide a torquer drive current to torquer coil 34 of the proper phase and magnitude to urge rotor 22 to the null position wherein the actual spin axis is aligned with the null spin axis 28 this is accomplished with the single sensor coil 32 and the single torquer coil 34 referring now to fig5 there shown a blocked diagram of a polar loop servo control for a two degree freedom gyro according to the present invention the wheel drive for the two phase stator can be of the type which is well known in the art and is described in u s pat no 4 818 922 wheel drive 60 provides drive current to phase.