Calculation of Dynamic Braking Characteristics of Wound Rotor Induction Motors [includes discussion]

Dynamic braking is an effective method of controlling the speed of a wound rotor induction motor, when that motor is subjected to a driving torque such as occurs on a mine hoist application. The accurate prediction of the dynamic braking characteristics, at the design stage, is essential if adequate thermal capacity is to be built into the machine and if sufficient co-ordination with the control design is to be achieved. It is intended to present a method of calculating the dynamic braking characteristics of wound rotor induction motors at the design stage. In this method, the effects of saturation are considered.