5HP from 24V is crazy. 3.6KW at 24V is like 150 amps. That's starter motor territory.
There are many in off-highway equipment...the tricky part is the "variable" part.
Can you drive ANY 24V DC motor as variable with a PWM? I have one in hand that is being driven on/off, but I don't know if I can drive it variably.
I am also looking into golf cart motors...many of them are much more powerful than I need...but start at 36V-48V
If I have a 48V golf cart motor, can I drive it with a variable 24V source? I've found a variable golf cart motor that is rated for 10hp at 48V - can I expect to get 5hp driving it at 24V? My simple DC equations I do remember tell me I can...?
Out of all the classes from engineering school, this is the one I remember the least about.