60Hz motor running on 50Hz power supply or vice versa

Both single and three phase electric motors are designed to operate at a specific power frequency. But sometimes we can use a 'wrong' motor in the power supply. induction motor Fundamental, RPM is directly proportional to Hz. If you decrease the power supply frequency, the motor will slow down. On the contrary, if you increase the frequency, the motor accelerates. RPM change is proportional to Hz change.