Electrical Outboard Conversion - VEC240 - HPM3000B

[Lucfer1501]

Hello, I am part of a team of students here in Brasil. The team is called Arariboia (famous native from Brasil). We are developing a Solar Boat for a competion here. One of our projects is the conversion of a Mercury outboard to accept an Electrical Motor.

Our setup is:

VEC240
HPM3000B

The project consists of the following steps:

Test motor under no load: Successful
Test motor under Load (using an Electromechanical braking system): Successful
Test motor load curve: Waiting
Teste on water: Waiting

I will post here more information bellow.

[Lucfer1501]

Testing the motor under no load was pretty simple, but we have to be sure of what is going to happen when the motor is on the boat's outboard beforehand. To do that we had a partner from a nearby lab in the university set up a Electromechanical braking system that could simulate the load of the boat on the motor's shaft.

Electromechanical Brake and Motor connected:


First Test under Load:
https://www.youtube.com/watch?v=-PbN5UO3lRE

[Lucfer1501]

During our initial tests using the Electromechanical Brake we encountered some issues that might happen to other users. To possibly help other future visitors I will detail here some of the issues:

• LED 7 (seven) Blinks Error - Motor phase winding disconnect protection:

The motor was running fine under no load (disconnected from the breaking system) and under load (connected to the braking system with coils ON).

But when we tested the motor + Brake system with coils OFF, it started spinning, achieved a high speed, then slowed down and finally shut down showing 7 Blinks as an error message.

Our theory is that the inertia of our Braking system Disc is so high that when running the Motor + Brake (Coils OFF), the Brake disc acelerates to a speed higher than the motor's synchronous speed. The motor then proceeds to decelerate, but the Disc does not decelerate because of it's high inertia and the fact that it has no load. The Brake Disk probablly keeps the rotor on a higher speed than expected which must trigger the 7 Blink protection somehow.