Properties
- flow rates up to 33,000 m³/h
- size: 200 – 1000 mm (impeller diameter)
- asynchronous external rotor motor
- small depth
- universally usable in all installation positions
- speed is variable using auto transformers
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Impellers
The high-performance axial fans have aerodynamically shaped blades:
- size from 200 to 300
- made of painted and galvanised steel sheet
- size from 315 to 630-6
- made of plastic
- size from 630-4 to 1000
- made of die-cast aluminium
The impellers or blades are mounted directly on the rotor of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.
Motors
- size from 200 to 300
- motor protection class IP44
- size from 315 to 1000
- motor protection class IP54
External rotor motors are used with moisture protection, with built-in ball bearings, and are designed with thermal overload protection. The drive by the external rotor motor provides a space-saving, compact and attractive design. The motor sits inside the impeller and is thus optimally cooled. For this reason, a 100% variable speed control can be guaranteed. Only well-dimensioned ball-bearings, fitted on both sides and with a long-life lubricant, are used. Both ball-bearing seats are ground to high precision in one work step to eliminate any vibration. External rotor motors are also characterised by an extremely low starting current. The windings comply with thermal class F. In addition, the windings have standard moisture impregnation.
Electrical connection
The motors are fitted with an outgoing cable. The electrical connection is made via an IP44 terminal box which is supplied loose.
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