Patent ID: 7190144

Claim:
An adjustment system for adjusting a proportional, integral, derivative (PID) controller in a limited rotation motor system, said adjustment system comprising: first transform means for receiving a first digital signal that is representative of a motor control signal, and for providing a first frequency domain sequence that is representative of a frequency domain representation of the motor control signal; second transform means for receiving a second digital signal that is representative of a position detection signal, and for providing a second frequency domain sequence that is representative of a frequency domain representation of the position detection signal; model identification means for identifying a representation of a ratio of the first and second frequency domain sequences; and PID adjustment means for identifying appropriate values for the coefficient k p of a proportional unit of the system, for the coefficient k i of an integral unit for the system, and for the coefficient k d of a derivative unit for the system responsive to the ratio of the first and second frequency domain sequences.