In the future, the cost of energy will increase due to environmental problems and limited resources. The electric motors consume a significant amount of electricity in the industrial and in the tertiary sectors of the European Union. Because of its simplicity and robustness the three-phase squirrel-cage induction motor is the prime mover of the modern industry. The electricmotor manufacturers are seeking methods for improving the motor efficiencies, which resulted in a new generation of electric motors that are known as energyefficient motors.