Gevisa induction motor 100hp 4 poles 460V 60Hz 1775rpm Type K Insul F

[CaptZ]

I have a situation where I have VFD's for conveyor motors. The vendor of the conveyors is supplying the above motors which I say are general purpose for the application. they have a 1.00sf and from what I can tell are not even inverter ready rated. I think Inverter-Duty Motors should be NEMA Design B and conform to the latest standards of IEEE 841 & 519, ANSI, and NEMA. I may be stuck with the Gevisa motors, do you think they will work?

 

[aolalde]

Inverter Duty motors normally have different construction features as compared to standard general purpose motors. The nameplate should be marked as “Inverter Duty Type”.

A standard motor could develop insulation or bearing failures in a short time when operating powered by a VFD.

 

[jraef]

If you are already stuck with them, you really only have 2 choices. Use them until they die, at which time replace them with a suitable motor. Or replace them now and avoid costly downtime that will eventually occur, and use these motors for something else that does not involve inverters. I would opt for the latter because downtime is usually more expensive than anything else, but accountants don't always see it that way.

By the way, IEEE 841 does not necessarily ensure suitability for inverter applications.

Eng-Tips: Help for your job, not for your homework Read faq731-376

 

[DickDV]

From the description of the motors given, as long as the leads between the drive and motor are less than about 150 feet, the motors will likely perform just fine. They are Class F which is acceptable. Class B insulation generally would not be acceptable.

IEEE519 and 841 have no bearing on motors' suitability on inverter power.

It would, of course, be better if the motors had the MG1 Part 31 indorsement but there are thousands of plain Class F motors out there doing just fine with drive power.

 

[mil3]

CaptZ,

My suggestion is that if you ahve doubts on the capability of the motors and do not have a choice but to accept them....then ensure that the installation is designed with maximum protection for your motors.
I suggest you have Reactors or dV/dT Output Filters installed on the output of the VFD's to protect the motor from the VFD's switching and voltage reflection phenomena.
I would use a dV/dT Filter but they are a bit more money than a standard reactor. If cost is an issue...go with a Reactor. Cheap insurance for the motors.