Re: Controllers

["VanDerWal, Peter" <vanderwp@fhu.disa.mil>]

>Motor spec is as follows -
>Voltage - 24V DC
>Continuous rated current - 15A
>power - 1/2 hp
>rpm - 1500
>Type - compound, with the field ON all the time.

How many electrical connectors does the motor have?

FWIW this motor won't produce 1/2hp, at least not continuously at the rated
current and voltage.  24V x 15A equals .48 hp input, assuming typical losses
you are looking at maybe 1/3 hp.

However it does look like you can safely run this motor at 36V and probably
even 48V, assuming 15 amps current that will produce 1/2 hp and 2/3 hp
respectively.


For an idea how a series/parallel contactor controller works check out:
http://www.angelfire.com/oh/PetesCafe/images/controller.gif
For a simple 24V three speed controller (off, low, hi) and:
http://www.angelfire.com/oh/PetesCafe/images/controller2.gif
For a little more complex 48V 4 speed controller.  This will also work at
24V if you use 6V batteries or 32V if you use 8V batteries.

Note: neither of these designs use a start up resistor, however it would be
simple enough to add another relay and resistor.  If your motor draws large
amounts of current at startup this might be a good idea to add.

Pete.
Life is hard. But it's harder if you don't know how the world works!