A sensitivity measure for armature-controlled DC servomotors and calculating optimum parameter tolerances

Armature-controlled DC servomotors are widely used in the motion control area in the process control industry. In this study a method is proposed to use a motor's transfer function to calculate the optimum parameter tolerances keeping the deviation in angular displacement in its tolerance region. These tolerances minimize a defined upper bound for the deviation of the angular displacement due to a motor's parameters variations. Furthermore, a sensitivity measure is defined to be used to improve the sensitivity performance of the motor and to compare various DC motors with different sets of design parameter values which realize the same transfer function.