A processor and method capable of automatically converting instruction mode to align a word boundary of a multi-mode instruction is disclosed, wherein the multi-mode instruction to be executed is from an L-bit instruction word. In this case, the motor has a housing and a motor body. The outlet of the first cooling duct is in communication, via a first diverting region, a third cooling duct arranged between the first and second cooling ducts, and a second diverting region, with the inlet of the second cooling duct.