MFA Model Motors

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 Phil Flint 
Unregistered guest
Posted on Monday, June 7, 2010 - 4:21 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hello 
I recently purchased some MFA RE-280 motors from you. They are being used in a gauge 1 model diesel locomotive to drive the wheels. They are set up in threes in a bogie wired in series. Can you please tell me what the stall current is of the RE-280 motor as I wish to add a thermal cut out to protect the circuit.
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 1257
Registered: 10-2004
Posted on Thursday, June 10, 2010 - 3:55 pm:    Edit Post    Move Post (Moderator/Admin Only)

We do not have a stall current for these motors, you can carry out your own low voltage test to determine the figure but you could also assume a figure of 6-8 times the motors FLC. I would estimate 5A at 3V. Providing thermal cutout is difficult. Motors can pull large currents simply by accelerating hard or by quickly reversing. If you have a cut out selected that it does not open during heavy loads, then it is also unlikely to open quick enough under stall conditions. Most motors will burn out their windings under stall conditions more quickly than a thermal device can operate at. You may be lucky but do check the thermal devices time / current relationship first.