Spin Turn
Spin Turn
(OP)
Hello, I wonder if there is a relation between the power of a transformer and turn number of its spins? if so how can be determined the turn number of a xformer of any power ?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Spin Turn
RE: Spin Turn
RE: Spin Turn
RE: Spin Turn
"Number of turns in a winding."?
I think that the answer is
"No." The number of turns affects the voltage but not the power rating. The power is more related to the amount of iron in the core and the size of the openings for the windings. There is not a direct relationship, but the weight of a transformer compared to a similar transformer will tell you more about the capacity than will the number of turns.
This is a very rough approximation, as in a heavy motor may have more power than a lighter motor.
It depends.
Bill
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"Why not the best?"
Jimmy Carter
RE: Spin Turn
Also what do u mean with"the size of the openings for windings "? ,İt is strange to me what is "opening" here and what a relationship with the power?
RE: Spin Turn
Pick a conductor size for the necessay ampacity at the hotspot. Do this for all windings.
Start adding turns to both sides until you are at the required turns ratio and you have the required impedance.
That doesn't close? Increase the conductor size on one side (or both) and try again.
The big boys probably feed everything into a computer program and get their starting point from that.
RE: Spin Turn
Rafiq Bulsara
http://www.srengineersct.com
RE: Spin Turn
Standard frame sizes may get redesigned every several years as economical choices change the ratio of copper or aluminum to silicon steel cost.
The size may be determined by desired impedance, losses, dimensional constraints and economics of materials. Without a standard core frame to start from the variability of cores sizes is practically infinite. Generally speaking, more turns of wire and less core cross section means higher impedance more copper loss (load related loss) and less core loss (constant loss). If the customer evaluates losses then it becomes even more complicated actually assigning a $ value to core watts and a different value to coil losses.
Neil
RE: Spin Turn
RE: Spin Turn
As the primary voltage is increased, the flux density in the core increases. At some voltage the core will saturate and the primary winding will probably burn up. A couple more chapters will explain saturation.
The primary voltage should be kept below the saturation point.
If the number of turns on the primary winding is doubled, the allowable voltage will be doubled.
Ratio: Pretty simple, the primary voltage divided by the secondary voltage. eg. primary voltage 480V, secondary voltage 120V, the ratio is 4:1.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Spin Turn
RE: Spin Turn
Get a book. Read a book.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Spin Turn
RE: Spin Turn
Volts per turn = V/N = d/dt (Phi) = 2*pi*f*B*A
We can see from this that another important variable in determining number of turns is core cross sectional area A. For given frequency f, voltage V and target flux density B, you could get away with fewer turns N by making the core area A larger....but then every turn is longer to reach around the larger core (a tradeoff).
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(2B)+(2B)' ?