1496 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1957 



90 



180° 

 SHAFT ANGLE, (9^ 



270° 



360° 



Fig. 7 — Error of a 27th order vernier resolver over one shaft revohition. 



180° 

 SHAFT ANGLE, ©rn 



360° 



Fig. 8 — Error of a 27th order vernier resolver before trimming. 



3.5 Moment of Inertia and Friction Torque 



The moment of inertia of the rotor of a 27th order harmonic resolver 

 is 63 gram em sq. 



The maximum break-away friction torque among five units was 0.027 

 in. oz. No change in this torque due to excitation of the unit could be 

 detected. 



