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Presently 3-ø AC system is very popular and being used worldwide for , , distribution and for . has the following advantages as compare to single phase system: • Power to weight ratio of 3-ø is high as compared to 1-ø alternator. That means for generation for same amount of , the size of 3-ø alternator is small as compare to 1-ø alternator. Hence, the overall cost of alternator is reduced for generation of same amount of power. Moreover, due to reduction in weight, transportation and installation of alternator become convenient and less space is required to accommodate the alternator in power houses.
• For and distribution of same amount of power, the requirement of material is less in 3-ø system as compare to 1-ø system. Hence, the 3-ø transmission and distribution system is economical as compare 1-ø system. Related pages • Let us consider the power produced by single phase supply and 3-phase supply at unity . Waveform of power produce due 1-phase supply at unity power factor is shown in figure (C), and figure (D) shows the waveform of power produced due to 3-phase supply.
• From power waveforms shown in figure (C) and (D) above it is clear that in the 3-phase system, the instantaneous power is almost constant over the cycle results in smooth and vibration-free operation of the machine. Whereas in 1-ø system the instantaneous power is pulsating hence change over the cycle, which leads to vibrations in machines. • Power to weight ratio of is high as compare to . Means for the same amount of Mechanical Power, the size of three phase induction motor is small as compared to single phase induction motor.
Hence, the overall cost of is reduced. Moreover, due to reduction in weight, transportation, and installation of induction motor become convenient and less space is required to accommodate the induction motor.
• 3-phase induction motor is self-started as the magnetic flux produced by 3-phase supply is rotating in nature with a constant magnitude. Whereas 1-ø induction motor is not self-started as the produced by 1-ø supply is pulsating in nature. Hence, we have to make some arrangement to make the 1-ø induction motor self-started which further increases the cost of 1-ø induction motor.
• 3-phase motor is having better • Power to weight ratio of is high as compare to 1-ø transformer. Means for the same amount of Electric Power, the size of 3-phase transformer is small as compared to 1-ø transformer. Hence, the overall cost of a transformer gets reduced. Moreover, due to reduction in weight, transportation and become convenient and less space is required to accommodate the transformer.
• If a fault occurs in any winding of a 3-phase transformer, the rest of two winding can be used in the open delta to serve the 3-phase load.
The same is not possible in 1-ø . This ability of 3-phase transformer further increases the reliability of 3-phase transformer. • A 3-phase system can be used to feed a 1-ø load, whereas vice-versa is not possible. • DC rectified from 3-phase supply is having the ripple factor 4% and DC rectified from 1-ø supply is having the ripple factor 48.2%. Mean DC rectified from 3-ø supply contains fewer ripples as compare to DC rectified from a 1-ø supply.
Hence the requirement of the filter is reduced for DC rectified from a 3-phase supply. Which reduce the overall cost of converter. From above it is clear the 3-phase system is more economical, efficient, reliable and convenient as compared to 1-ø system.
best dating honeymoon phase over single phase motor wiring diagram - Single Phase Motor schematics and working
So before you start to wire your motor, you need to be sure what type it is. Also be aware you can change the running direction of the motor by reversing the connections of either the start winding or the run winding. This has to be done before you start the motor - you can’t do it while it is running.
An AC motor needs rotating field to start. For this purpose a single phase motor has two windings. To create a rotating magnetic field the current in one of those windings has its phase shifted (reaches peak earlier than the other winding). One simple way to achieve the phase shift is to connect a capacitor in series with the second (starting) winding.
Once the motor is rotating the starting winding may be disconnected (by a relay). A reversible motor may have a choice of connecting either an inductance or capacitor in series with the starting winding. Another sigle phase design uses the so called shaded pole. These motors usually have only one bulky coil and one pair of poles.
The magnetic flux at one end of the pole is delayed. This creates some semblance of rotating magnetic field. The flux delaying is done with a shorted coil (a copper ring that is often visible).
Shaded pole motors are only good for small powers due to their low efficiency. One thing going for them is that they are cheap to make. Efficiency of motors is the critical question when designing a motor. The two ways that this is achieved are: • Proper selection of the wire for the motor winding.
• Proper selection of the core. An electric motor whether AC or DC relies on magnetism to turn the motor. An individual coil of wire will have only a small effect on motor. The best way both theoretically and in actual practice is to use as many coils as possible within the physical limits of the motor. This is done using what is known in the industry as magnet wire.
Wire gauge or diameter is determined by the maximum current draw of the motor and ballanced against the number of turns desired and the size of the motor. Hope this helps a little.
I have an Electro ADDA C80M-2 0.75kW single-phase blower motor that I need to hook up, switched, to power a cyclonic dust separator that I've built.
I thought it would be a piece of cake: pop off the wiring cover and red-to-red, blue-to-blue, green to earth. But this is what I found: The dark world of electric motor schematics with Z2, U1, Cr (switch?) et cetera.
Bit much to expect line and neutral marked, I suppose? If I'm reading the schematic correctly, it's currently set up to rotate in the clockwise direction and I've attached the earth terminal, thanks to the nice symbol on the casing, but I'm afraid I don't have confidence in which terminal to take live and neutral to.
Please help if you can. locked by ♦ Feb 12 at 13:42 This question exists because it has historical significance, but it is not considered a good, on-topic question for this site, so please do not use it as evidence that you can ask similar questions here.
This question and its answers are frozen and cannot be changed. More info: . Pictures should help: As @Asmyldof stated, the motor has no concept of hot or neutral, so the polarity of the AC connections is not important.
Connect one of them to hot, and one of them to neutral. The motor will turn the same direction even if you reverse these connections. To reverse the motor, you have to remove the metal jumpers, and reposition them as indicated by the diagram. Note that you absolutely should ground the motor housing, but this is a protective measure (the yellow/green-stripe wire is the earth/ground connection), but ground is not neutral. With Alternating Current (single phase) it doesn't matter to the electronics/electrics which goes where, because the current flows in both directions in equal amounts over equal time periods, so the device can't see which is which.
Unless it compares them to Earth, which it shouldn't do, because that means putting a current into earth and possibly tripping earth-fault protectors (if not humans licking the fan, we all do it once in a while).
If there's a neutral indicated, it's a suggestion for safety, because some part of the wiring comes closer to a casing than another part, or it's just arbitrary engineer's choice. No indication? No matter! Especially since you also have an Earth connection. Now, Cr is not a switch.
Cr is an essential component, which hopefully is still attached to that pretty yellow and blue cable. It's a capacitor that allows the motor to start and run smoothly as it was designed to. If you don't have it any more, some calculations can be done to get in the ballpark of a decent value, followed by trying the one in the middle of that and seeing what happens. But, as you can imagine, still having the original is quite a lot easier.
The squiggly line does mean the Live and Neutral connection. The physical set-up reflects the M-connection, as you guessed, so to see "what happens" with CW rotation, connect the live and neutral as the two connections going up along the ~ in the M connection drawing.
So basically most (all if you exclude switch/cap) gut-feelings are right in this case :-) -- Still: Always be careful and ready to pull the plug or switch off right away...
– Oct 9 '14 at 0:41
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