MV motors working voltage
MV motors working voltage
(OP)
Dears,
I know that there are motors working on 6.3 KV , 11 KV , and I would like to know whether there are motors working on 22 KV or not. Also , regarding the motor prices , I would like to know whether the motor price increased with the opertating voltage or what?
Best regards.
I know that there are motors working on 6.3 KV , 11 KV , and I would like to know whether there are motors working on 22 KV or not. Also , regarding the motor prices , I would like to know whether the motor price increased with the opertating voltage or what?
Best regards.





RE: MV motors working voltage
Yes, price does go up with voltage. Basically, users tend to want to use as low of a voltage as they can get away with in order to keep the switchgear and control equipment costs down. So the highwer the voltage, the fewer motors are made at any given HP, until you get to the point where it becomes impractical to make a motor at a lower voltage. For instance, a 600kW motor at 3300V is going to be less expensive than a 600kW at 6000V, but you may not even find a 3000kW motor at 3300V because it would not make any sense at that voltage. But a 3000kW 6000V motor will be less than a 3000kW 11kV motor because anything above 6000V is typically made to order as an engineered system. At highr voltages there are no "book" prices available to compare, but sufice to say that level of custom handling means the volume is low, so the price will be higher.
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: MV motors working voltage
thanks for your reply but I am speaking about asynchronous motors
Best regards.
RE: MV motors working voltage
What's the application for the motor? Size?
RE: MV motors working voltage
RE: MV motors working voltage
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: MV motors working voltage
5000V motors (in the US) is a good workable voltage for very large motors.
JTK
RE: MV motors working voltage
These motors are for crushers and cement mills main drives where you need 4.4 MW motors. The reason we want to work on 22 KV is that the power tariff for 22KV is less than 11 KV for example.
Regards.
RE: MV motors working voltage
* Homer Wisdom - "Operator, Give me the number for 911" *
RE: MV motors working voltage
usamaegypt,
everything is possible, it's just a matter of time and money. Why don't you just ask a few of the biggest motor players to give you quotations for both options. Then discuss with them maintenance and operational cost and compare with energy savings on 22kV.
How does this sound to you?
Tommy
RE: MV motors working voltage
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: MV motors working voltage
I'm sure any reputable motor supplier can give you budget-level pricing for the various voltages.
RE: MV motors working voltage
Contact ABB. They have developed the "MOTORFORMER".
A new motor concept for Synchronous machines, for compressors, refiners, blowers, etc. The big difference is a completely new cable winding technology which makes it possible to operate at voltages upto 150kv. That means the power can be taken directly from the high voltage grid
Range offered 4-6 POLE, 5-45 Mw 20-150kV
Regards
RE: MV motors working voltage
There wer six mills for a total of 36000 HP installed. The reason for Asynchronous motors was that Synchronous motors don't work or play well together.
There is only a few mechanical degrees seperating the full load and the idling, rotating position of the shafts. It is very challenging to get them to share a mechanical load.
I have heard that there are synchronous motors designed to share a mechanical load, but I am not familliar with them.
Years ago I read a paper discussing running two alternators from the same prime mover. They made a special coupling that had an angular adjustment. The adjustmenmt was made on a trial and error basis until the alternators shared the load properly. The budget was basically,"If you can find the parts you need in the system, go ahead, otherwise forget it."
Re Power factor. There was a large building up on the hill housing two Synchronous Condensers.