A customer has a failed 24V heating circ pump on his boat. It's based on a standard domestic ('Grundfos type') central heating pump. The mains motor has been changed for a (presumably) brushless DC motor He's enquired about getting it repaired, and has had answers varying between 'No' and 'We can sell you a new pump for =A3500'.
The spindle turns freely with the power off, putting on the power holds it in one position.
Here are some pics of the electronics, looks pretty basic. To my untutored (read 'behind the times'!) eye appears to be four small power transistors, six smaller transistors(?) and a few standard resistors & capacitors. There are three sets of leads going from control board and disappearing into the motor case apart from the red & black pair (power in). Five leads which look to be the main motor leads. Six smaller leads which I'm guessing must come from a tacho/ encoder. Three small leads, maybe speed control pot.
Pics of the innards:-
Thanks for any help Tim