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The external rotor motor, as the name suggests, has its rotor on the outside with the stator on the inside. It is more difficult to make than the internal rotor motor, but has significant advantages:

Energy-saving variable speed external rotor ECM motors 

• The fan blades can be attached directly to the outside of the rotor.
• A large proportion of heat is generated within the rotor, this is on the outside and can be dissipated easier.
• Variable speed
• Compact, space-saving design
• Soft start-up
• Thermally protected
• Variable speed (0-100%)
• Maintenance free
• Quiet run
• Exceptional reliability and durability
• Applications: HVAC&R, clean rooms,air curtain systems,machinery cooling

SPECIFICATION:

TYPE 1:
a)Dimensions:
   outer diameter: 100-120mm
   lenght:         70-80mm
   votage:         200-280V,single phase
   speed range:    500 - 1700rpm
   max.power:      200 - 250 Watt
   frequency:      50 - 60 Hz
   with electronic,integrated in motor and an interface.
   b) Electronic:
   functions:on/off
                   500 - 1700rpm
                   protection against over-temperature
                   n2-constant under full power line
                   protection IP 44
                   contiuous running S1

TYPE 2:
a)Dimensions
   outer diameter: 100-120mm
   lenght:         100-110mm
   voltage:        200-280V,single phase
   speed range:    400-1400rpm
   max.Power       350-400 Watt
   frequency:      50 - 60Hz
   with electronic,integrated in motor and an interface
b)Electronic:
   Functions:on/off
                   500 - 1700rpm
                   protection against over-temperature
                   n2-constant under full power line
                   protection IP 44
                   contiuous running S1