Induction Vs Synchronous motors for paper mill
Induction Vs Synchronous motors for paper mill
(OP)
What are the decision making advantages / disadvantages for choosing induction or synchronous motors for industrial applications such as paper mill refiners? The sizes are 1,000 to 3,000 HP, and the voltage is 2.4-kV.
The mill is served by a 33 MVA 115/12.47-kV transformer, and the expansion will require the installation of a second 33 MVA transformer and second 12.47-kV bus. The refiners are served through 12.47/2.4-kV stepdown transformers.
The mill is served by a 33 MVA 115/12.47-kV transformer, and the expansion will require the installation of a second 33 MVA transformer and second 12.47-kV bus. The refiners are served through 12.47/2.4-kV stepdown transformers.





RE: Induction Vs Synchronous motors for paper mill
There is a very detailed article on this subject on the GE website if you can find it.
imho, a great disadvantage of sync motors is they are more complex ==>> more stuff to maintain and more stuff which can fail.
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RE: Induction Vs Synchronous motors for paper mill
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RE: Induction Vs Synchronous motors for paper mill
RE: Induction Vs Synchronous motors for paper mill
I believe low-speed synchronous motors will provide a signficantly higher efficiency than an equivalent induction motor, or at least that used to be true. If speed is 720 rpm or higher, I don't think there is much difference in efficiency.
The ability of the synchronous motors to operate at a leading power factor to provide vars to your system is also another advantage.
RE: Induction Vs Synchronous motors for paper mill
Typical average efficiencies and then kWH consumptions in one year are:
Induction Motor (EFF =93.8);
kWH= (1000 * .746 / 0.938 )*365*24 = 6,966,908
Synch. @0.8 PF (EFF=94.2);
kWH= (1000*.746/0.942)*365*24 =6,937,325
Synch. @1.0PF (EFF=95.1);
kWH= (1000*.746/0.951)*365*24 =6,871,672
Assuming energy cost $0.05 dollars per kWH, the yearly electric bill becomes:
Induction ---------- $348,345
Synch @ .8PF-------$346,866
Synch @1PF -------$343,583
RE: Induction Vs Synchronous motors for paper mill
In some territories, there could be an additional pf penalty in one form or another that could significantly boost the cost advantage.
Best regards,
Mark Empson
http://www.lmphotonics.com
RE: Induction Vs Synchronous motors for paper mill
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