Synchronous Machine

Brushless DC Motor

Brushless DC Motor Working Principle

Brushless DC Motor: The term Brushless DC Motor 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 …

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Single Phase Synchronous Generator

Single Phase Synchronous Generator: 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 Synchronous Generator stator winding can …

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Hunting in Synchronous Machine

Hunting in Synchronous Machines

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

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Slip Test on Synchronous Machine

Slip Test on Synchronous Machine

Slip Test on Synchronous Machine: Direct and quadrature axis reactances of a salient-pole synchronous machine can be estimated by means of a test known as the Slip Test on Synchronous Machine. The machine armature is connected to a 3-phase supply whose voltage is much less than the rated voltage of the machine, while the rotor …

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Synchronous Machine Operation

Operating Characteristics of Synchronous Machine

Synchronous Machine Operation: The Synchronous Machine Operation are examined here under conditions of variable load and variable excitation. One of these quantities will be assumed to be held constant at a time while the other will be allowed to vary over a wide range. Further, here too the armature resistance will be assumed negligible. This …

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