Category: SYNCHRONOUS MACHINE

Brushless DC Motors

Brushless DC Motors: The term brushless dc motors is applied to many configurations of ac synchronous motors in which semiconductor control is used to control stator currents such that maximum torque is obtained at a given speed. In a conventional motor the mechanical contactor, the commutator, maintains 90° elect degrees space displacement between the rotor […]

Single Phase Synchronous Generators

Single Phase Synchronous Generators Single Phase Synchronous Generators – Certain applications, usually restricted to less than 10 kVA are better served by a single-phase synchronous generator. Examples are emergency, domestic/office supply, portable power for construction tools etc. Because of simplicity of distribution wiring, these loads are better served by a single-phase arrangement. Single-phase generator stator […]

Short Circuit Transient in Synchronous Machine

Short Circuit Transient in Synchronous Machine: The Short Circuit Transient in Synchronous Machine being electrical in nature is much faster than the electromechanical dynamics discussed in Sec. 8.13. It will, therefore, be assumed that by the time the major features of the short-circuit phenomenon are over, the rotor speed remains constant at the synchronous value. […]

Hunting in Synchronous Machines

Hunting in Synchronous Machines So far the operation of the synchronous machine under steady-state conditions at constant (synchronous) speed has been considered. Under these conditions where        Pe= electrical power output of the machine                  Pm= mechanical power input to the machine the machine losses having been assumed negligible. […]

Parallel Operation of Synchronous Generators

Parallel Operation of Synchronous Generators: Parallel Operation of Synchronous Generators – The operation considered in Sec. 8.8 is that of a synchronous machine connected to infinite bus-bars. Here the parallel operation of two finite size synchronous generators will be considered, which is the way large practical size generators are used. In a power system the […]