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O From the concept of design, synchronous alternators are fundamentally of two types u salient pole type i.e. with projecting poles u Non salient pole type i.e. in which the poles do not project. O Low speed alternators driven by hydraulic turbines are built as salient pole machines. O These types of generators are designed
As stator construction remains the same as in induction machines, there are mainly two types of rotor used in construction of alternators: •Salient pole type. Armature Reaction in Synchronous. Generator. • When the field gets distorted, it is known as cross magnetizing effect and. • when the field flux gets reduced, it is
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A Two Pole Machine. (p=2). Salient Pole Structure. N. S. +. +. DC. Voltage. Phase A. Phase B. Phase C. STATOR. (armature winding). ROTOR. (field winding). The negative terminal for each phase is. 180 degrees from the corresponding positive terminal. +. Fig. 5. PDF created with pdfFactory trial version www.pdffactory.
Because the rotor speed is proportional to the frequency of excitation, synchronous motors can be used in for high speed synchronous machines, such as steam turbine generators, while salient pole structure is used . Once we get the expression of mmf for a single phase winding, it is not difficult to write the expressions
fundamental frequency of 6 Hz [3,4]. The converter is. Control of Large Salient Pole Synchronous Machines. Using Synchronous Optimal Pulsewidth Modulation. Fig. 1 Construction of a SAG mill with stator and rotor separately mounted equipped with thyristors which are the most powerful semi- conductor devices available.
machines. However, due to mechanical, as well as operational reasons, perma- nent magnets in synchronous machines are restricted to those with ratings much lower than .. in six-pole machines. These are typically driven by steam or combustion turbines. The vast majority of salient-pole machines have six or more poles.
Key words: Synchronous machine, synchronous motor drive, direct torque control, motor modelling. Synchronous problems in a Direct Torque Controlled (DTC) salient pole synchronous motor drive is proposed. A motor model Thus Stromberg decided to develop a power electronic converter for asynchronous motor
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of the synchronous machine. Basically there are two general classifications for large 3 phase synchronous generators ——cylindrical rotor and salient-pole rotor - . The cylindrical-rotor construction is peculiar to synchronous generators driven by steam turbines and which are also known as turbo alternators or turbine
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