motor Laminations

[lukp]

lukp (Electrical) 27 Jun 07 18:28
Hi
I am building laminated poles of a switched reluctance motor. However, the lamination manufacturer used uncoated steel plates to do the laminations as I can tell my inspection and confirmed by having a conductivity test when stacked them together. They told me that that's what they usually use for their motor clients. My question is do we do the coating (using vanish) with individual lamination before stacking them and put in oven, or stack them and soak the stacked rotor as a whole unit in vanish and then oven them.

Sorry for sounding a bit naive?!

Thanks in advance for any advice about stacking lamination in general.

C Lu

 

[sreid]

Most motor laminations are insulated with a black oxide "coating" (really an iron conversion).

 

[aolalde]

If the magnetic flux is constant while circulating on your poles, you will not have induction and the lamination could work un-insulated (as it is).
If the flux is changing you will need insulation. The higher the flux frequency the more the interlaminar insulation is required. You could send your lamination to a profesional lamination shop for the application of a core plate, grade C5 is the best since endures high temperatures. Manual varnish will provide irregular thickness and loss of steel density for a given core length, increasing the operating flux density.