Th KitcheAid Mixer is rated for 120V / 60Hz / 325W.
You'd need to run it with a converter if you connect it to a 240V power source.
One more thought. Most countries I know that run 240V also have a 50Hz frequency.
Converters only take care of voltage, not the frequency.
As such, you'd provide the mixer with only 50Hz. I'd expect that this will have an impact on the performance of the mixer.