The hub motor's rotating speed data was acquired with a tachogenerator
which generates a linear voltage amplitude level directly proportional to its rotating speed within the operation range.
The examples of position or velocity sensors can be potentiometers, encoders, tachogenerator
and linear variable differential transformer (LVDT) etc.
2) contains the technical realization of a nonlinear single-input/single-output system consisting of drive motor (M1), identical motor (M2) (used as current generator), tachogenerator
(T), incremental encoder (I) and clutch (K).
The block diagram of servodrive speed control circuit with HSM60 electric servodrive and K4A5 tachogenerator
([K.sub.W] = 0,0184 Vs/rad) is shown in Fig.1.