Not possible to know without knowing your motor's inductance and
The capacitor will resonate with the inductance, and the ringing will
be damped by the motor's resistance. If it has very low resistance,
you'll need to add a resister, usually in series with the cap. The
objective is to ensure that the ringing is at a frequency where it
will cause minimal problems of getting into other circuits, and to
damp it out as quickly as possible consistent with not losing too
much efficiency in your drive circuit.
Google for some tutorial on damped tuned circuits and you'll get the
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