Recommend an MV motor supplier please?
Recommend an MV motor supplier please?
(OP)
Hi there, was wondering whether anyone can point me to a manufacturer who can possibly supply a 2500hp 4kV motor?
It'll drive a booster compressor for low pressure sour gas. Due to a weak power system, there's a possibility of using a soft starter for this motor, but if I can find a motor with starting current ~3.5 times rated current, I might get away without the soft starter. American/NEMA standards only please. Thanks.
It'll drive a booster compressor for low pressure sour gas. Due to a weak power system, there's a possibility of using a soft starter for this motor, but if I can find a motor with starting current ~3.5 times rated current, I might get away without the soft starter. American/NEMA standards only please. Thanks.





RE: Recommend an MV motor supplier please?
Rinezry,
You may wish to contact Teco or GEC Alsthom. According to your application, a slip ring motor with a round rotor will fit yours.
Bob
RE: Recommend an MV motor supplier please?
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RE: Recommend an MV motor supplier please?
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RE: Recommend an MV motor supplier please?
RE: Recommend an MV motor supplier please?
Major motor manufacturers with 5kV NEMA design offerings available in stock in the US: Siemens, ABB, Toshiba, GE, Reliance, Teco/Westinghouse, Baldor, Marathon, Tatung.
Smaller companies but specializing in MV motors: Electric Machinery, Ideal Electric, Louis Allis (not the same as of old, but focused on MV now).
I don't believe that Fuji, LSE or GEC/Alstom have product readilly available in the US, nor are they NEMA design. The same goes for Hitachi, Schorch, Hyundai, Mitsubishi and several other well known worldwide names. Most of them sell here, but mostly engineered products for special applications.
5kV soft starter manufacturers here in the US: Siemens, ABB, Toshiba, GE, Square-D/Schneider, Motortronics, Allen Bradley, Benshaw, Saftronics, Emotron
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RE: Recommend an MV motor supplier please?
RE: Recommend an MV motor supplier please?
Saying that, anyone knows a website that provides good guides on VSDs? Cheers.
RE: Recommend an MV motor supplier please?
Why are you so reluctant to use soft starters? They are not as expensive as you might think, maybe 20-30% more than DOL? Do not assume that because a VFD is so expensive that a soft starter is as well, they are completely different technologies, especially in MV applications. If you are concerned for your generators, I would consider them for sure.
magneticted,
How does one design a motor to take that much less starting current without giving something up, such as full speed running torque, in the process? I have read their website and see that they claim "starting current designs down to 300% FLC are available on request", but does that mean that the motor is designed for 300% starting current DOL, or that they have motors optimized to be started with soft starters? The latter seems more likely to me.
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RE: Recommend an MV motor supplier please?
RE: Recommend an MV motor supplier please?
OOhh .. and the fact that our client is insisting that they want a VSD as the preferred choice for this compressor.
RE: Recommend an MV motor supplier please?
RE: Recommend an MV motor supplier please?
That said, 250% is getting to be close to where a soft starter will not work for a compressor, but I have seen it work, depending on the compressor and motor design, and what the system will tolerate. 280% however is much more likely. Bottom line, one should not write off a particular technology without adequately investigating it.
magneticted;
Thanks for the info. Interesting enough to learn more about it.
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RE: Recommend an MV motor supplier please?
That makes the motor simpler
in addition to the list of manufacturers above, we have had good experiences with WEG motors, they also make a VSDsand offer 3 year warranty for when both supplied together
http://www.wegelectric.com
We have also been offered Chinese motors, "cheap as chips" as they say over here,
One other point, GEC-Alsthom now trading as Alstom
RE: Recommend an MV motor supplier please?
You can visit our website at www.morleymotors.com
RE: Recommend an MV motor supplier please?
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RE: Recommend an MV motor supplier please?
I agree with your customer, if the compressor requires high torque to start properly, a VFD is the logic solution for effective torque/current this accentuated by that weak substation.
In spite of the lower initial investment Soft starters will provide a poor ratio torque/current.
RE: Recommend an MV motor supplier please?
Since this is an old thread resurrected by stevecockerham I assume you have a motor by now, Just curious what did you get? and how is it working?
Chuck
RE: Recommend an MV motor supplier please?
Not gonna get the chance to see the 2 working together till May though.
Rinezry