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Shaft "specificity" - why no BLDC NEMA 56J motors?

Shaft "specificity" - why no BLDC NEMA 56J motors?

Shaft "specificity" - why no BLDC NEMA 56J motors?

(OP)
I must cut my project to my variable speed pump for some odd reason. The BLDC is appropriate for my purpose as water in an open loop circulating pump must overcome a very high initial head and throttle back to very low speeds. It makes little sense to use an A/C motor. This operation is something that I would think to be common for pump motors;

however, there are no 56J DC motors. There are plenty of 56C DC motors. Why not? Shaft adapters are like $150. That puts the project cost outside of the acceptable range.

Am i missing something? Any insight is appreciated. I'm about to cut the rope on this project.

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