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for salient type motor Lq>Ld, and non-salient type motor Lq=Ld; Lq and Ld are q-d axis inductance
Answer'Salient' means to 'stick out', so a 'salient pole' machine is one whose rotor windings are fitted to pole pieces that stick out from the rotor shaft. A 'non-salient pole' machine is one in which the windings are placed in slots machined along the length of the rotor.
Salient pole machines run slower and have more poles than slotted-rotor machines, and are typically used in alternators run by water turbines; slotted-rotor machines are typically used in alternators run by high-speed steam/gas turbines.
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What are the advantages of salient pole?
• They allow better ventilation • The pole faces are so shaped that the radial air gap length increases from the pole center to the pole tips so that the flux distribution in the air-gap is sinusoidal in shape which will help the machine to generate sinusoidal emf • Due to the variable reluctance the machine develops additional reluctance power which is independent of excitation
What is salient pole of a generator?
The phrase "Salent Pole" is used to specify a specific internal field winding configuration around the magnet of a generator. In English, Salient means "sticking out" or "most noticeable or important". Pole refers to the North or South end of a magnet. If you take a long rectangular magnet with a North and South Pole on each end, and you surround it with electrically conductive material like wire, and you spin the magnet, electrons will flow back and forth in the wire. This is how some generators create electricity. You can determine if your generator is a salient pole generator by inspecting its internal components. With a salient pole generator, you would notice that the magnetic poles in the magnet are "sticking out" and when passed in proximity to the wire an electrical current is created. For a salient pole machine, the windings are wrapped around magnets with edges or teeth that stick out. To read up on the discovery, evolution and present day use of salient pole electricity generating technology: http://mysite.du.edu/~jcalvert/tech/salpomo.htm The Dinorwig Power Station in Wales utilizes Salient Pole generators to pump billions of gallons water up a mountain as well as generate electricity when letting it back down again as an electricity storage system: http://en.wikipedia.org/wiki/Dinorwig_Power_Station
Why pole face are chamfered in dc machine?
in order to reduce armature reaction.
What is d-q coordinate of IPM machine?
d-q a direct (magnet pole) and quadrature (90deg out of phase electrically) axis. This is identical to surface permanent magnet machine (SPM).
When welding with DCEN the electrode is positive and the work is negative?
DCEN means Direct Current Electrode Negative. Hook the welding cable to the Positive connection (+) on the machine, the ground cable to the Negative connection (-) Electricity travels from Negative pole to Positive pole.
How many poles as salient pole rotor?
'Salient' means 'sticking out', so if the pole sticks up from the rotor shaft, then it is a salient pole machine.
How many different types of alternator are there for a 1998 fore contour?
type 1: single phase tree phase poly phase type 2: rotating armature rotating field type 3: salient pole machine non salient pole machine type 1: single phase tree phase poly phase type 2: rotating armature rotating field type 3: salient pole machine non salient pole machine
What is the priniciple of salient pole alternator?
The term, 'salient', simply means to 'stick out'. So a salient pole machine has field poles that stick out from the rotor. The principle of operation is the same as for any other generator.
What is salient pole construction details?
'Salient' means to 'stick out', so salient poles stick out from the machine's shaft, as opposed to shafts which are slotted to contain its windings.
What is the salient pole type field structure andnon silent pole type field structure in an alternator?
There are two types of rotors - salient pole and round rotor. Salient pole rotors have protuding poles that the coils are wrapped around, and are typically used when many poles are needed. The main electomagnetic difference is a salient pole machine naturally has a varying air gap between the rotor and the stator, due to the pole saliency.
Why the synchronous motor is always a salient pole machine ie why don't we use a cylindrical pole machine as a synchronous motor?
The speed of the machine is tied to the power supply frequency and the number of poles the machine has. It becomes impractical to make a round rotor machine with many poles, so machines that spin at low revolutions will typically be salient designs. A two or four pole machine could be round rotor designs.
What is blondels two reaction theory?
A reassessment is presented of the application of the two-reaction theory to unsaturated salient-pole machines. The study reveals that calculation of the airgap flux or voltage of the salient-pole machine by the two-reaction theory is far from agreement with the test results under unsaturated conditions. A method of representing an unsaturated salient-pole machine by a simple function is described. By the aid of this new method it is shown that the direct- and quadrature-axis magnetizing reactances of an unsaturated salient-pole machine are not the same as the slopes of the airgap lines of the respective magnetization characteristics. by sadaf khan from dns college of engineering and tecnolgy. j.p nagar,NH:24
Why salient pole machine have higher air turbulence?
The term used is 'windage', rather than 'air turbulence', but the reason is in the name: 'salient' means to 'stick out' -salient poles extent from the rotor, offering greater 'drag', if you like. This is not as critical as it may sound, because salient pole machines are normally driven by water turbines, which rotate at much lower speeds than alternators driven by steam turbines.
What is salient and non salient pole alternator?
In salient pole alternator Xar is unequal in D-axis and Q-axis, due to non uniform air gap where as in non-salient pole Xar is equal in every axis due to uniform airgap between stator and rotor. Xar is armature reaction reactance.
What is non salient pole?
poles are not projected outwards
What are the advantages of salient pole?
• They allow better ventilation • The pole faces are so shaped that the radial air gap length increases from the pole center to the pole tips so that the flux distribution in the air-gap is sinusoidal in shape which will help the machine to generate sinusoidal emf • Due to the variable reluctance the machine develops additional reluctance power which is independent of excitation
COMPARE SALIENT POLE AND HNDRICAL ROTOR MACHINES?
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