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Sorry for late answer but the coil-span, number of circuits, type of jumpers, are intact as per original winding even though there are many compressor installed side by side and some of them are are rewinded by our company and all of them are almost on original ratings but got problem with this...

Hello everyone, I have rewind a Seimens motor 250KW with exactly same data as original and motor is consuming higher ampere against original, motor details are Atlas copco compressor Rated ampere 445 as per name plate Current ampere on start initially it was 515 the. Slowly rising and now it is...

If i rewind this motor should i increase its guage? From 14 to 13 and make it 5.6 OHM at 30°C?

Neither i change the wire size nor turns, as per user's statement they took field resistance in winter around 20°C it was 6.6OHM IN ORIGINAL WINDING rest you know

iop95, I used three different meters for volts and amperes both shows almost same and the drive is programmed to give 23.5amp no matter whats the voltage

No there is nothing additional in excitation circuit, i can't check this right now, will check it if i can, If i rewind the motor again should i increase it's guage and lower its resistance to 5.6OHM? Or if anyone could help me with this thing?

The copper i used is best quality available here and it says 99.99% copper so there is not a chance of copper impurity, if i change blower from 5.5hp to 7.5 hp will it lower the temperature? Motor is currently running on 18amp and after 2 to 3 hours temperature raised to 90°C

Tell me one more thing if i add one more blower on commutator side or change the original blower to commutator side will it impact good or bad? Or i should change original blower 5hp to 7.5hp

Kflan if there is any slight changes in wire guage the weight wouldn't be same as original weight is exactly same as original and when motor was original it shows 7 ohm on when motor is not running and 7.7 after hot

Tell me one more thing if i add one more blower on commutator side or change the original blower to commutator side will it impact good or bad? Today i run motor at 18.5 amps it start at 155volts by the time goes it increases to 194 in 75 minutes (off load)

Edison can we talk on email?

Speed remain same from 180 to 280 volts 500RPM In the nameplate its written 440 Armature volts 600 Armature amps 180 Field volts 23.5 Amp But RPM is 500/1200 We are running it on maximum 500RPM on load is there any problem with this? Posting winding connections in a while

Coils weights are same as original so there won't be a guage or turns difference

Field connections are 2 parallel Voltage is 180 and motor starts at 175 volts but by the time goes it increases and after half an hour it reaches 280 volts 23.5 amps SWG 14 single wire parallel connection Will answer all the questions you guys have i just need to solve this problem ASAP thanks

Only interpol windings are original shunt and field winding are rewound, it was in round wire originally SWG 14 Used same 99.99% copper All the spacer below Field winding cores are intact. Yes amperage remain same but voltage keep increasing and field temperature touching 100°C at 280Volts...

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Here are some photos will share more laterhttps://files.engineering.com/getfile.aspx?folder=213524ae-228b-4144-adc5-da2d3bc444a7&file=Screenshot_2022-07-25-03-16-41-327_com.miui.gallery.jpg