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Fan unit for generating gas streams

  • US 5,288,216 A
  • Filed: 06/14/1993
  • Issued: 02/22/1994
  • Est. Priority Date: 11/23/1990
  • Status: Expired due to Term
First Claim
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1. A fan unit for generating gas streams, in particular for vacuum cleaners, which unit comprises a motor (4) having a motor axis and an impeller wheel (1) which is also electromagnetically active and in conjunction with electromagnetically active parts (19) of the motor stator (3) generates the torque of the impeller wheel via an air gap (11) extending perpendicular to the motor axis, and formed between surfaces of the impeller wheel (1) and the motor stator (3), wherein the electromagnetically active part of the impeller wheel (1) is a conductive disc (7) which is arranged in a plane extending perpendicular to the motor axis and which has one surface (8) extending perpendicular to the motor axis and bounding the air gap (11) at the rotor side, and at the stator side the air gap is bounded by planar stator poles (19) formed on a radial bounding surface (12) of an iron cylinder (15), extending perpendicular to the motor axis, by the provision of radial slots (17) in which the coils (20) are arranged.

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