This is one carried over from the old forum
Deep Sea System makes great straight drive motors.
I did not like Tecnadyne too much. We were running a high speed/torque application and saw catastrophic failures from couplings, shafts, and gear boxes. We were in the 10 – 20hp range. My Tecnadyne experiences were 3 years ago. They might have those problems solved by now.
In reference to H-bridge….are we talking about rectification? If so, DSSI’s motor controllers have it internally. They offer analog, digital, and serial control.
We’ve run our appications off of 350 VDC and 240 VAC with great success. Most problems were operator error. We’ve seen some of these thruster go over 4000 hours (hard core, gritty subsea action) without failure.
I’ve heard good reviews of sub-atlantic thrusters. We’re eyeballing them for a similar, low hp, project.
Good luck. Let us know what you go with; and, how it turns out.
skinny