Control Methods for Electrical Machines - Husson_ Rene

The control of electrical machines very much depends on the context and

environment in which motors are considered. How a machine is used has a strong

influence on its control laws. These are especially related to loading characteristics,

variables requiring control, operating conditions and, consequently, to the models

chosen.

Loading intrinsically governs the choice of control laws and the way they are

implemented. Common load torques are inertia torques, whether they are constant or

variable, or possibly even randomly variable. Constant inertia torques are induced

by rotating masses, which may be either symmetric homogenous, working as inertia

flywheels, or dissymmetric heterogenous, causing torque fluctuations or vibrations.

Inertia may vary due to a load geometrical distortion, as is the case in Watt

regulators or hinged jibs, or to a change in the rotating mass, like in a winder.