You can buy them. You can make them. What is the normal trip level,you'd have to look up. A resistor (suggest metal oxide) from ground to hot, at about 6 mA should trip the GFCI. e.g. R<=120/0.006 The problem is more complex when you look here: http://www.csemag.com/single-article/ul ... ba57a.html
I actually suspect that you may have an AFCI/GFCI combination and it's tripping on an arc fault because of the motor. If that's the case, I would consider an RFI filter (possibly medical grade which has a lower leakage) and appropriately sized ZNR's.
There have been reports of just plain flakey GFCI's. So contact the manufacturer too.
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