Features

• Controls max 3 DC motors
• Current up to 4A/motor
• Supply voltage up to 46V
• Current sensing
• PWM control
• Single sided PCB
• 15 pin Control Unit compatible header

The main problem in thruster design is how to isolate engine from water. There are three solutions used to keep engines away from water:

• O-ring
• Rotary shaft seal
• Magnetic coupling

The best and more complicated is solution 3. The engine is perfectly isolated from water because it is connected to the propeller using magnetic coupler.
Solutions 2 and 3 are similar.

Introduction

A brushless DC motor is electric engine where the stator is a classic 3 phase stator and the rotor has surface mounted permanent magnets. It is equivalent to a reversed DC commutator motor, in which the magnet rotates while the conductors remain stationary. BLDC motor has no commutator and brushes, it requires electronic control for operation. They often have external position sensors used by control unit, but sensorless control is also possible.