Motors are classified into six types: Y Series High Voltage Three Phase Induction Motor, YKK (YVPKK) Series High Voltage (Frequency Conversion) Three Phase Induction Motor, YKS Series High Voltage Three Phase Induction Motor, YR Series High Voltage Three Phase Induction Motor, YRKK Series High Voltage Three Phase Induction Motor, and Y2 (YVP2) Series High Voltage (Frequency Conversion) Three Phase Induction Motor.