Couple of questions:
How large is the filter capacitor after the bridge rectifier?
What is the VA rating of the transformer? (VAC and AC amps)
You are drawing motor current through D5, a 1N4148, which can handle 100-200ma at the most.
Are D1 and D2 around the correct way? Is the bridge around the correct way. What is 6M8? 47u is far too high, Pin 1 goes no-where. No values for R8 and R9. The chip is labelled IC2. 1N4148 diodes should not be used for 100mA. How many mistakes can a person produce on a such a simple circuit? You must take the prize. If the motor takes only 100mA, why use a FET?
Hopefully you're not going into production with a design that almost works.I don't really know why it works but it does now.