Search results with tag "Synchronous machines"
C Synchronous machines - ggn.dronacharya.info
ggn.dronacharya.infomotors (Induction motors are cheaper for smaller ratings) and ... synchronous machines. a ... Synchronous motorSynchronous motor • Synchronous machine is provided with damper windings • Damper winding is a short-circuited winding similar to the squirrel-cage winding of induction motor.
II. Synchronous Generators - University of Technology, Iraq
www.uotechnology.edu.iqSmaller synchronous machines are sometimes used for private generation and as standby units, with diese l engines or gas turbines as prime movers. According to the . arrangement of the field and armature windings, synchronous machines may be classified as . rotating-armature type. or . rotating-field type. Types of Synchronous Machine
THEORY, CONSTRUCTION, AND OPERATION
geosci.uchicago.eduOF SYNCHRONOUS MACHINES The synchronous electrical generator (also called alternator) belongs to the family of electric rotating machines. Other members of the family are the direct-current (dc) motor or generator, the induction motor or generator, and a number of derivatives of all these three. What is common to all the members of this fam-
E MOTORS & G ENERATORS - nidec.com
www.nidec.comSynchronous Machines Series MS/GS As a standard our synchronous machines are built with either salient pole or cylindrical rotors, depending on the speed and
THEORY, CONSTRUCTION, AND OPERATION
geosci.uchicago.eduOF SYNCHRONOUS MACHINES The synchronous electrical generator (also called alternator) belongs to the family of electric rotating machines. Other members of the family are the direct-current (dc) motor or generator, the induction motor or generator, and a number of derivatives of all these three. What is common to all the members of this fam-
EEEB344 Electromechanical Devices Chapter 5 CHAPTER 5 ...
abs.cu.edu.trSmall synchronous machines – use slip rings and brushes. Larger machines – brushless exciters are used to supply the dc field current. A brushless exciter is a small ac generator with its field circuit mounted on the stator and its armature circuit mounted on the rotor shaft. The 3-phase output of the exciter generator is rectified to direct
Types of Electric Motors - UAH - Engineering
www.ece.uah.eduSynchronous Machines 4-17 THREE-PHASE ROTATING FIELDS require three pairs of windings 120windings 120º apart energized by voltages that also have a 120apart, energized by voltages that also have a 120-degree phase displacement. SYNCHRONOUS MOTORS are specifically designed to maintain
Synchronous Machines - IIT P
www.iitp.ac.inlet us consider a 4-pole synchronous machine. IWhen the three phase armature winding (stator) is supplied with a three phase balanced supply, It produces a rotating mmf in the air gap whose speed is the synchronous speed N s = 120f P For a 4-pole machine and 50 Hz supply, N s =1500 rpm. IWhen the eld winding (rotor) is excited by DC, it will
Synchronous Machines - Virginia Tech
www.courses.ece.vt.educurve (OCC) and the short-circuit current curve (SCC) for a typical machine. The voltage curve slope begins to decrease as the field current increases due to saturation of the iron in the machine. Figure 12: Open-circuit and short-circuit characteristics of a synchronous machine at rated speed. The impedance is Z = R jX s 1
Permanent Magnet Synchronous Machine Model for Real
web.mit.educircuit of the machine will be the circuit shown in Fig. 4. Rmmi ω0Ψq Rm d Lmd d dt Ψ + − + − Vd id if d f dt Ψ + − Rs ls Fig. 4. D axis thevenin equivalent circuit of the PMSM This model is similar to the conventional equivalent circuit of the synchronous machine, except there is no leakage inductance on the field. C. Typical data ...
EE 340 Spring 2011 - UNLV
www.egr.unlv.eduThe rotor of a synchronous machine is a large electromagnet. The magnetic poles can be either salient (sticking out of rotor surface) or non- ... • It is possible to adjust the field current on the main machine by controlling the small DC field current …