Hi all,

I've got 12VDC geared motors here which a client wants to use in
his product

There are two sizes, both from Shayang Ye

http://www.shayangye.com/english/products.html

The IG420294-25111R and IG520150-40101R

The IG42 is what I'm preparing the PCBs for now, the IG52 is what
he (might) want to use in the future

The run current of the IG42 is ~0.8A, which the planned relay can
handle, but the start current does seem quite "sparky" when I test
with a crocodile clip, and I worry that this may in time weld or pit
the relay contacts. The IG52 run current is ~1.5A, so its starting
current will be even higher.

Three options

(1) a heavier relay, although that too may get damaged, and space
is limited for anything bigger than a 16-pin DIL type

(2) "something" to absorb the starting spark

(3) PWM the motor from 0 to run current

Option (2) would be the most convenient at this stage. What could
I use ? An RC snubber across the motor and/or relay ?

Option (3) is doable. Product has PIC content with a spare output,
would mean changes to the PCB and s/w

TIA

Joe


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