Use wire cutters to cut the exposed wire on the power cord's white wire. To cut the wire, position the blades of the wire cutter over the exposed wire and clamp down.

Repeat for the power cord's brown wire connection. This cuts off the connection between the power cord and motor.

Pull the power cord out. It is no longer attached to the device.

For reassembly, the wires will need to be soldered together. Check out this soldering guide for instructions.