Spindle Motor Recommendations

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martyscncgarage
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Joined: Tue Mar 28, 2017 12:01 pm
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Location: Mesa, AZ

Re: Spindle Motor Recommendations

Post by martyscncgarage »

tblough wrote: Sat Jun 05, 2021 8:14 am That's a 3450 nameplate motor. I'd be careful running it much more than that. 1800 rpm motors can usually get away with running double the nameplate because manufacturers usually make a 3400 rpm motor with the same components.
Exactly. Consult with the manufacturer to see what the MAX RPM rating of the motor is. Let them know you are using it with a Variable Frequency Drive and wish to increase its speed.
It "looks" like a standard duty motor, not an inverter duty rated one.
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
jpmsteadi
Posts: 45
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Re: Spindle Motor Recommendations

Post by jpmsteadi »

For sure! It is a 3450 nameplate RPM motor. It is inverter rated, I am running it at like 78hz to get that 7k rpm. It has a 1.62 ratio pulley on it, so when the spindle is at 7k the motor is only spinning 4350 rpm, so not too much over the nameplate. When I bought it the ebay ad said it was rated for 5400 rpm, but on the motor I can't find that anywhere. I didn't pay much for it. I am hoping by keeping it cool and only barely running it over the rated RPM I will be okay. If it ends up dying Ill replace it with a more proper motor.

It does say its inverter rated though. 10:1 VT 2:1 CT.
martyscncgarage
Posts: 8456
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Location: Mesa, AZ

Re: Spindle Motor Recommendations

Post by martyscncgarage »

Call Marathon with the model number and ask the rated RPM.
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
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