Controlling Faulhaber and Maxxon motors in Meccano

I have a 48V AC source from an old relay logic test circuit. There is rectification and smoothing to about 40V DC.

I wonder if this would be good for running the Faulhaber and Maxxon 24V precision motors that are now available to the Meccano enthusiast? These take about 300mA off load to 3A or so stalled.

What modifications are required to the Darlington pair control circuits you suggest?

Posted by pauljj on 07/07/2004, at 15:13 GMT

Controlling motors from 40v DC

Main concern here is the high voltage. I would put a voltage rating on the transistors in this case of about 70 volts minimum. Use the C suffix for the TIP31/32. I would use the TIP41/42C myself. For any lower power transistors a 2N1711 or BC639/640 may suffice. For driving a single motor the use of ballast power resistors of 22 to 33 0hms at about 50watts is one simple method of voltage reduction.

Posted by Anonymous (varient412@yahoo.co.uk) on 10/02/2010, at 19:24 GMT

Controlling Faulhaber/Maxxon motors from HV supply

If using electronic logic to control these motors from a 40-48v supply I would use a 7812 regulator PRECEDED by a zener diode-transistor regulator for the logic electronics supply. Any sensors operating directly off the HV supply will need to have their output voltage limited by a compatable resistor-zener(say 10-11v) combination to interface with the logic

Posted by Robert Neill (varient412@yahoo.co.uk) on 14/02/2011, at 11:14 GMT