Motor Specification
Motor Specification
(OP)
Hello,
I am writing my first motor specification and I'm unfamiliar with some terms.
I'm looking at an example that specs a 10:1 minimum speed range. What does this mean?
I need help determining insulation class. Anybody willing to provide or know of any sources on the internet for help on this issue? The example I have shows Class F Minimum, inverter rated per NEMA MG1.
Thanks!
I am writing my first motor specification and I'm unfamiliar with some terms.
I'm looking at an example that specs a 10:1 minimum speed range. What does this mean?
I need help determining insulation class. Anybody willing to provide or know of any sources on the internet for help on this issue? The example I have shows Class F Minimum, inverter rated per NEMA MG1.
Thanks!





RE: Motor Specification
More complex answers are given on AB, ABB, Baldor, Siemens etc home-pages.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Motor Specification
10:1 speed range by the way means that the motor is designed to be used with a VFD, and you can "safely" run the speed at 1/10th the rated speed without worrying about cooling, accuracy, loss of torque etc. So if you have an 1800RPM motor, you can run it at 180RPM without external cooling; theoretically anyway. Regular motors are typically only good down to 5:1 or maybe 6:1.
RE: Motor Specification
10:1 Motor will not overheat at low speeds.
Inverter Duty Insulation rated for Drive switching spikes
NEMA MG1 can be downloaded at the NEMA website.
RE: Motor Specification
The last time I checked, only a condensed version was available on-line. Has that changed?
RE: Motor Specification
RE: Motor Specification
This will take you to a free download of a condensed and out-of-date version of MG-1. The current 2006 version costs $239.
RE: Motor Specification