» underwater propulsion systems

Main characteristics

» For ANY depth (no pressure hull)

» Low maintenance

» Hardware speed-control circuitry

» Stable low-RPM operation

» Feedback connection

» Robustness to noise

What is it all about?

We have developed a system of underwater propulsion that requires absolutely no pressure vessels in order to protect the mechanics of a motor. This means lower cost, low maintainance and better performance! Also, no pressure chamber means lower weight than other propulsors on the market, further improving the efficiency.
Motors used are based upon brushless technology and using our control power electronics they work flawlessly and reliably at ANY speed, no matter how low that may be!

In addition to that, along with the propulsor you get our own specially designed power electronics with built-in speed and current closed loop control logic - all you have to do is give the reference of wanted speed (or current) and direction. Electronics will do the rest, your CPU doesn't have to care one bit about the propulsor!

Why should I use your propulsor?

There's a number of advantages of using our propulsors in favor of other products:

• No pressure chamber necessary, therefore no seals, O-rings, etc. » low maintainance!
• You can go to greater depths since pressure is no more a concern
• Brushless technology: no brushes as in conventional DC motors
• Higher efficiency: using brushless technology means no friction, thus you get power at lower power consumption. Also, direct water contact improves cooling of windings
• Power electronics have a speed-control loop built-in, all you need to do is give the reference!
• Electronics can give you real-time shaft speed measurement - no more undetected blockages or stalls!

What's the interface to the user like?

User should provide the control power electronics with basic control signals and power connections:

Power connections

• 5V for logic
• 12-48V for motor (depending on motor size and specs)

Control signals

• Reference speed - an analogue or PWM signal 0-5V
• Direction - CMOS/TTL logic level
• ON/OFF signal, also CMOS/TTL compatible

Optional control signals

• Speed readout - a short impulse given every 1/6th of a turn, can be fed to a typical uC counter, timer or interrupt connection and can be used for measuring real propulsor speed or detecting malfunction (ie. clog)

Seems complicated, are there any caveats in using your propulsors?

From the user-side of view - No! The interface to the user consists of a power-tap, speed reference, direction selection and an optional shaft-speed signal. It is a bit complicated to manufacture such a propulsor, but let us worry about that :)