Braiding a motor starts with half the strands and twice the length of what you want. You’ll need an extra set of hands, too.
Wind the motor backwards about 10 turns with someone holding the other end. Grab the reverse wound motor at the halfway point then disconnect the motor from the winder. Fold the motor in half and it will braid itself. For a tighter braid and less length, wind the motor backwards a little more, like 15 turns. Use D/T rubber bands to keep the ends together.