Fan unit generating gas streams

Details Fan unit generating gas streams Fan unit generating gas streams

1995-11-30

1998-08-25

Sheikh, Ayaz R.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

4174237, 310 62, 310114, F04B 4906

Patent

active

057977186

ABSTRACT:
The invention relates to a fan unit for generating gas streams, in particular for vacuum cleaners, which unit comprises an impeller wheel (1) and a motor (4), which is a radial induction motor comprising an external stator (2) and an internal rotor (3), the stator (2) comprising a laminated core (2a) with coils (2b) arranged in slots, the rotor (3) comprising two concentric cylinders (3a, 3b), of which the outer cylinder (3b) is made of an electrically highly conductive material and the inner cylinder (3a) is made of a magnetically highly conductive material, one of the two axial end faces (3c) of at least one of the two rotor cylinders (3a, 3b) being in planar contact with the impeller wheel (1), the motor (4) being energised by means of a frequency changer (29 to 37) and the speed setting being derived from process-dependent nominal values and adjustable set-point values.

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