Technical Features


Technical Description :
      Niroo Tahvieh Disc - Rotor - Motors are asynchronous, induction motors in which the disc shaped rotor revolves around a stationary shaft, which is fitted with a disc shaped stator. The rotor incorporates ample dimensioned bearings, which are packed with high quality special grease and sealed for life. The insulation is to class H ( 180° C ). All electrical parts of motor are dust and splash proof, to protection class IP65. This disc type electromotor with its extremely quiet operation is the heart of every Niroo Tahvieh Direct Drive Fan. The non-rotating shaft is secured in rubber mountings so that there is no metallic connections between the impeller / motor assembly and fan housing.
      Niroo Tahvieh Direct Drive Fans are installed in both the supply air and air extractor devices and are designed for non-stop operation in permanent ambient temperatures of -20° C up to + 70° C. Fan housing and impeller manufactured form galvanized steel plate. Niroo Tahvieh Direct Drive Fans only take 1.5 times the nominal current on starting up and their power factor is higher than 0.90.

Automatic Adjustment Of Rotational Speed :
      Niroo Tahvieh Direct Drive Fans have Considerably steeper curves than Conventional fans. The rotational speed and consequently the air volume regulates itself when there are dirty filters and coils and also high resistances in the system. This decisive advantage is due to the design of the Disc - Rotor - Motor with slippage of up to 50%.

Stepless Electrical Speed Control :
      By the variation of the supply voltage, rotational speed of Niroo Tahvieh Direct Drive Fans are stepless controlled form 0-100% Reduction of the supply voltage results in lower rpm and lower air volume and also lower power consumption.

Installation :
Niroo Tahvieh Direct Drive Fans can be installed in any desired position.

Precision Balancing :
      The complete motor/impeller/fan housing assembly is dynamically balanced with computerized multifunction instrument. The standard of balancing is grade Q2.5 to Q1. This feature ensures very quiet operation and extended life.

Testing And Re-Testing Guarantee maximum precision, quality and reliability :
      Every component and part is inspected and tested at numerous control points.