I’ve fixed around 30 dysons with this issue (dc35, dc45, dc59, v6,v7). I simply measured points around on that motors circuit board for a positive and negative that appears when the trigger is pulled, then cut the output wires and connect them to where I found a voltage. (You should only need to move one of the wires, as it’s usual just one polarity that goes and needs a new source). If your brushbar spins the wrong way, move that wire to an opposite voltage point found. After testing, no heating issue, no effect on battery life, no fires. 2 of those dysons are my own and have been using them for 2 years with this repair and no issue.