External rotor motor          ECOFIT external rotor motors are available with IP 20 or IP 44. IP 20 motors are self-ventilating and can give superior power to IP 44 motors with equivalent heat rise. The power on the shaft, voltage and frequency, shaft, connections and protection... can be defined according to your requirements and application. If specified, ECOFIT external rotor motors can be manufactured in multispeed.    Data sheets             General conditions of use To avoid overheating, the motor must not be mechanically overloaded and should be installed in cool ambient air with adequate ventilation. Care should be taken to establish the correct power demand and rotational speed of the load before selecting the ideal motor. Incorrect matching of motor and load may lead to reduced motor life expectancy, or severe over-heatingand "burn-out" may take place. The purchaser must test for motor total temperature in the application, with the worst operating conditions for themotor. ECOFIT should then validate the test results. ECOFIT motors are speed controllable by voltage variation, but where electronic controllers are used they must be designed for electric motor duty and be compatible with ECOFIT products. Capacitors must be of the "motor run" type and be of the recommended value, voltage rating, and life expectancy.