cordova64
Member
- Location
- Vancouver Washington
Can you apply a 60hz supply to a 50 hz motor?
Actually that is technically correct, but usually the voltage is NOT the same. Most 50Hzmotors from Germany are going to be rated 400V (or 380V if it is older). If you consider the flux density can be boiled down to a ratio of V to Hz, then as long as the ratio remains the same, it will work the same (as gar already said). So if you have a 400V 50Hz motor, the ratio is 8:1. If you supply 480V 60Hz to it, the ratio is still 8:1, so it works fine, same torque just 20% faster. Since HP = Tq x RPM / 5250, then the higher RPM with the same Tq means higher HP.Lxnxjxhx said:You guys may all be right, but with the equivalent circuits of motors that I've seen I can't quite get to 6/5. Same voltage, but raise the freq., right? Nameplate says 50 Hz?
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I likely am the only out there, but I don't know about "bulk flux" and "flux wiring". Could you tell us some more?cadpoint said:...I will note that you also throw in the bulk flux statement, I understand it I just don't like that thought.
... Alot of thoughts come to mind, type of flux wiring being the key. ...
iwire gave very good information ... the MOTOR will likely be fine, but may run a little hotter as the iron isn't optimized for 60 Hz. we talk about maintining the "volts per Hertz ratio". You will see that most inverters do that as their most basic control criteria.cordova64 said:Thanks for the replies. It was very useful. Sounds like if the motor from germany is 400v @ 50hz. Then applying 480v @ 60 hz would be fine. With a HP increase of 20%
gavjem said:Excuse my ignorance in advance - I'm not an electrical engineer, just a mere project engineer.
We have purchased a Sumitomo motor from Japan rated at 18.5kWx4Px440Vx 60Hz. We will be using this in India where the supply will be 415Vx50Hz, though it will be operate from a 6-60Hz VVVF.
Will there be any issues with performance of the motor (speed, torque etc.)?
Any advice is most welcome.