All motors have a metal nameplate fixed to their body (right).
The nameplate gives a number of the motors characteristics including:
- kW or hp (horse power)
- Hz (frequency)
- Ambient temperature
- Efficiency (%)
- Voltage (Star / Delta)
- cos φ (power factor)
Manufacturers also publish Motor Efficiency tables (below) and carefully label each of their motors with data that enables the purchaser to match a motor to its end use and enable the selection of a high efficiency motor.