Dynamic balancing rotor & impeller of 250HP motor | Level G1.0

[@twintwo1429]

Was the overhung impeller already balanced or taken into consideration?

[@ontarioelectricmotorman7309]

For this case, we balanced the impeller first because it was too much out of balance. We made a new shaft for the impeller balancing, after that we put the impeller on the rotor and balance again. In most of the cases, you can balance them together.

[@twintwo1429]

@@ontarioelectricmotorman7309 good practices. In our shop, we found that up to 20% of new impellers are not balanced to G-1 SPECS. same for various other attachments also. We had a customer complain of excessive vibration in a hazelton pump we rebuilt, less impeller. They installed a worn impeller with improper gap at wear ring. Go figure!!!.

[@ontarioelectricmotorman7309]

@@twintwo1429 yes, we would need the impeller, pulley or coupling sent in with the motor, unless it is a small unit.

[@twintwo1429]

@@ontarioelectricmotorman7309 👍

[@alexandergarcia381]

Saludos, como saber a cuantas RPM debo ajustar la realizacion de las diferentes pruebas en funcion del rotor, existe algo de guia? De antemano gracias.

[@ontarioelectricmotorman7309]

Por lo general, la máquina equilibradora recomienda la velocidad de equilibrado al menos 1/3 de la velocidad de funcionamiento. Por ejemplo, la velocidad nominal del motor es de 3600 rpm, elegiría 1200 rpm para la velocidad de equilibrio. Sin embargo, cuanto mayor sea la velocidad que elija, mejor, pero no menor que 1/3.

[@alexandergarcia381]

@@ontarioelectricmotorman7309 Excelente! Realmente agradecido!

[@alexandergarcia381]

Es decir que para un motor de 1200 RPM, con 400 rpm alcanzaría o sería muy pocas RPM para balancear en este tipo de máquinas balanceadoras.?

[@ontarioelectricmotorman7309]

@@alexandergarcia381 Sí, tiene usted razón.

[@exzyond]

@@ontarioelectricmotorman7309 so what if i choose less than 1/3 the speed ? like motor rated speed is 3000rpm but i use 400rpm for balance speed