Permanent magnet type pump

• US 4,115,040 A
• Filed: 05/25/1977
• Issued: 09/19/1978
• Est. Priority Date: 05/28/1976
• Status: Expired due to Term

• Current Assignee: Franz Klaus-Union
• Original Assignee: Franz Klaus-Union
• Inventors: Knorr, Manfred
• Primary Examiner(s): Husar, C. J.
• Application Number:
  US05/800,219
• Time in Patent Office: 482 Days
• Field of Search: 417/420, 64/28 M, 192/84 PM, 310/103, 310/104, 310/105
• US Class Current: 417/420
• CPC Class Codes: H02K 49/104 Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
• CPC Class Codes: H02K 49/106 with a radial air gap
• CPC Class Codes: H02K 49/108 with an axial air gap
• CPC Class Codes: H02K 5/128 using air-gap sleeves or air-gap discs

Abstract

Disclosed is a permanent magnet pump in which the pump impeller and the interior rotor of a permanent magnet driving means receives drive torque transmitted in synchronism by an exterior rotor. The exterior rotor is positioned, axially in one form and radially in another form, opposite the interior rotor with an air gap defined between them. Thin, plate-like permanent magnets carried by the rotors face each other across the air gap. The pump impeller shaft and the interior rotor are housed and supported in a common space which is sealed from the exterior by a partition of non-magnetizable material extending through the air gap.

Claims

1. A light-weight permanent magnet type pump having a pump impeller shaft and a permanent magnet drive means therefor, said drive means comprising an interior rotor fixed to the pump impeller shaft, an exterior rotor mounted for rotation closely adjacent the interior rotor with an air gap therebetween, said interior rotor being adapted to receive a drive torque of at least 1 m·

kg transmitted in synchronism by said exterior rotor, said pump impeller shaft and said interior rotor being housed and supported in a single sealed chamber, a partition of non-magnetizable material extending through said air gap and closing said chamber, a closed ring on each of the opposed surfaces of said interior and exterior rotors, each of said closed rings being formed by the same even number of permanent magnets of alternating polarity and embedded in a non-magnetizable material in side-by-side contiguous array, each of said magnets being a relatively thin magnetic plate formed of a magnetic material containing alloys of cobalt and rare earths and magnetized in the direction of the thickness of said air gap, said magnets each having a magnet length, extending in the direction of thickness of said air gap, which is somewhat larger than the air gap thickness, each of said magnets having a magnet width, extending in the direction of rotation, which is larger than said magnet length.

2. A permanent magnet type pump as claimed in claim 1 in which both said interior rotor and exterior rotor have a cylindrical configuration with the interior rotor nested within the exterior rotor.

3. A permanent magnet type pump as claimed in claim 1 in which said inner rotor and outer rotor have facing planar surface each carrying its array of permanent magnets.

4. A permanent magnet type pump as claimed in claim 1, wherein the magnet height extends perpendicularly to the magnet length, and the magnet width is several times the magnet length.

5. A permanent magnet type pump as claimed in claim 1, wherein said magnetic plates abut each other in the direction of the magnet height a.

6. A permanent magnet type pump as claimed in claim 1 wherein said partition has a high specific electrical resistance.

7. A permanent magnet type pump as claimed in claim 1 wherein said partition is made from a plastic material.

8. A permanent magnet type pump as claimed in claim 1 wherein said magnet arrays provide an even number of pole pairs between 6 and 36.