Synchronous Machine

Brushless DC Motor Working Principle

Brushless DC Motor Working Principle: The term Brushless DC Motor Working Principle 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 …

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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 …

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Hunting in Synchronous Machine

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

Slip Test – Determination of Xd and Xq: Direct and quadrature axis reactances of a salient-pole synchronous machine can be estimated by means of a test known as the slip test. 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 is …

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Power Flow Transfer Equations

Power Flow Transfer Equations: Power Flow Transfer Equations – The flow of active and reactive power in a synchronous link will now be studied. The approach will be analytical and armature resistance will be considered for generality of results. Figure 8.42 shows the schematic diagram of a synchronous generator wherein E̅f leads V̅t by angle δ. The synchronous …

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