400hz motors, whats the deal?

Thread Starter

strantor

Joined Oct 3, 2010
5,386
That's probably why I didn't think it was common. Since all I want or need is 60Hz that's all I've ever set one for.
You might find use for speeds higher than 60Hz. When I put a VFD on my lathe I decided to omit the mechanical gearing (belt change pulleys). It had a 1HP single phase motor which I replaced with a 2HP 3 phase motor, and I geared (belted) it for a permanent low-mid range. To achieve the higher speeds that it used to be capable of, I exceed 60Hz.
 

shortbus

Joined Sep 30, 2009
8,208
My lathe has a multi-speed gear head stock, and the Bridgeport is a variable speed so 60Hz works good. My 2 older lathes I retro fitted with DC variable speed motors.
 

MaxHeadRoom

Joined Jul 18, 2013
22,062
That's probably why I didn't think it was common. Since all I want or need is 60Hz that's all I've ever set one for.
My reasoning when using a standard 4 pole motors with VFD, to usually go up to 120Hz, I figure the balancing and bearings used by the manuf will be the same as their 2 pole models, so the 4 pole will be safe to run at x2 the plate RPM.
Max.
 
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