Hi Franc,

I think you are probably correct - My initial checks had suggested that
it was the power MOSFET, and the ones I am looking at are 50v with an
RDSon of 0.014, which I believe is low.

Many thanks

Andrew

Franc Zabkar wrote:

On 21 Nov 2006 04:35:37 -0800, put finger to
keyboard and composed:

There is a very similar looking component right next to it, although it
has different markings.

The one I have removed was connected to the negative feed from the
battery, with one of the other pins connected to a resistor.

This is probably the motor driver MOSFET. Before you replace it, I
would check all its support components, and I'd also confirm that the
motor is OK. At the very least I'd check the brushes.

When replacing the MOSFET, choose a high current, low RDSon type. You
may find that ST Microelectronics have a cheaper, more readily
available range than IRF.

The other, similar one, has one pin connected to the positive battery
terminal (which is also shared with the positive feed to the motor),
and one of the other pins is connected to the negative feed to the
motor.

I think that is probably a back-emf suppression diode, eg MBRB2060CT
(20A, 60V).

Sounds pretty likely, I'd expect there to be several MOSFETs in the
controller, is it in parallel with any other similar looking components?

If the golf cart is designed to travel in the forward direction only,
then a single MOSFET would suffice.

- Franc Zabkar
--
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