Look these three pictures...
Under IEC standards, all motors are described in terms of their operating and design characteristics using
a motor nameplate attached to body of the motor’s housing.
Nameplates which can display the following specific pieces of information:
1. Manufacturer name and manufacturer-specific ordering code.
This code will typically contain information about frame size and mounting arrangement.
2. Rated volts - The voltage at which the motor is designed to operates and give optimum performance.
3. Full load amps –.used to facilitate cable sizing, starter selection and motor protection.
4. Rated frequency in Hertz, and rated full load speed in revs/minute at that frequency.
5. Rated temp rise or insulation class – Industry standard specification of the thermal tolerance of the motor insulation.
6. Rated power (kW).
7. Electrical connection and associated operating parameters –
i.e. three phase motors can be connected in a ‘star’ (Υ) or ‘delta’ (Δ) configuration.
In a star configuration the current flowing from the supply is reduced as is the torque.
8. Power factor for the motor.
9. Efficiency class – IEC nameplates quote EFF ratings at full load.
It is a measure of how well the motor converts electrical energy to mechanical power.