Cooling is a detail at the moment; speed control, reversibility, and how to match the prop to the motor are what I really need to figure out.
sure, I could add a fan, ducts, etc. But I think it will need water cooling to be successful.
I need about 8 hp continuously; well, for 45-60 minutes, which is the same I suppose.
That's a tough job for a DC motor; most are made for short duty cycles.
This forklift motor is probably prehistoric; the plate picture from the ad is hard to read, and in Italian just for added amusement.
"servizio", [service] appears to read ".53 [or .58] 25%"
I take that to mean duty cycle. 53 could be temperature C?
If we take the amps x volts from the plate, and compare the result to the KW on the plate, the discrepancy would seem to indicate 69% efficiency at 36V, 72% at 48V
So 3.5kw of heat at 48V; that's a lota heat!
Monitoring the heat of the field coils is easy enough, but it's the armature that always melts first.
this motor is not the right motor; but it's 150 euros, $200. The "right" one is $2,000, + $1,500 for the required control.
and another grand for the batteries.
If I buy this motor, I'll probably control it with straight relays, or even a manual lever switch [I'd have to fabricate that]. So it would have 2 speeds, 24V and 48V; and full reverse.
available controls are not able to handle 240A continuously, 150 seems the max [even though they're called 400A controls].
This motor comes with 'the original oil pump', which I take to mean hydraulic pump. so reversing would have been done hydraulically. This is a series wound motor, not designed reversible.
I would have to extract the armature connections; I've done that before with a starter motor.
The starter motor didn't like reversing. it seemed more sparky, and slower. but it did its job.
This way I'd possibly achieve a usable result at a usable cost.
According the plate, the current is equal at different voltages. the power and rpm decreases.