At 08:57 AM 5/28/2003 -0400, you wrote:
>Hey everyone,
>              Thanks for your help so far.  I just had a thought while
>designing the SCR controller.  I really don't need an inrush limiter if
>I ramp the motor up slowly and don't have a filter cap do I?  Anyone
>know how slow I should change the angle to be safe?

The motor will produce a torque proportional to motor current. Limited by
the internal resistance of the motor at stall. How long it takes to wind
up will depend on the motor and the inertia of the load attached to the
shaft, so there's no one answer.

The maximum current that the motor will draw from a stall is the LRA
(locked rotor amps). You should probably design for this current to be
drawn for all but heatsink considerations.

Note that if you "plug" the motor it could draw up to double the LRA.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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