Motor Specification Question
Motor Specification Question
(OP)
In a specification I am reviewing, under the Motor section there were two requirements which I don't fully comprehend...
1) Protection shall be provided against galvanic action between dissimilar metals by the use of gaskets, washers or other appropriate means.
As far as I know, there are no dissimilar metals within a motor which make contact with one another. Is this true? This is not even a corrosive environment where this will be operating - so I am not sure why it was included in the spec.
2) Non-metallic material shall be fire resistant, anti-static, and stable in the presence of hydrocarbon liquid, vapor and gas.
What non-metallic material do they expect to encounter in a motor? terminal blocks and insulation...anything else? just seems like a strange requirement...has anyone run across this before?
Thanks in advance.
1) Protection shall be provided against galvanic action between dissimilar metals by the use of gaskets, washers or other appropriate means.
As far as I know, there are no dissimilar metals within a motor which make contact with one another. Is this true? This is not even a corrosive environment where this will be operating - so I am not sure why it was included in the spec.
2) Non-metallic material shall be fire resistant, anti-static, and stable in the presence of hydrocarbon liquid, vapor and gas.
What non-metallic material do they expect to encounter in a motor? terminal blocks and insulation...anything else? just seems like a strange requirement...has anyone run across this before?
Thanks in advance.





RE: Motor Specification Question
Item 2 - typical non-metallic materials would include gaskets and paint.
RE: Motor Specification Question
RE: Motor Specification Question
Other non-metallic parts might include shaft seals, and if it is a fan-cooled motor, the fan.
RE: Motor Specification Question
Would a standard motor already have gaskets between the housing and the body?
Would a standard motor have non-metallic parts which met the criteria mentioned?
RE: Motor Specification Question
There are motors that are build to meet a given Standard (with a capital S). There are many motor standards in existance. NEMA MG-1, IEC, IEEE, and on and on.
If you go to a cheepee motor supplier, you quite probably can buy a motor made to no standard at all. The supplier would probably gladly tell you that he is selling you a "standard motor".
Pass your customer spec requirements, along with your own application specific requirement on to a reputable motor manufacturer and ask for their best recommendation. Then get every bit of literature and test data available. If test data is not available, insist that the manufacture perform the appropriate test. Then read and understand all of that information. You will find things that you don't understand. Ask direct and pointed questions to the manufacturer. Eventually you will both come to the conclusion that the origianlly proposed motor is not adequate for the application. Repeat until you have something that will work for you.
RE: Motor Specification Question
John