GB2182808A - Electric motor having a spherical gap - Google Patents

Electric motor having a spherical gap Download PDF

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Publication number
GB2182808A
GB2182808A GB08526804A GB8526804A GB2182808A GB 2182808 A GB2182808 A GB 2182808A GB 08526804 A GB08526804 A GB 08526804A GB 8526804 A GB8526804 A GB 8526804A GB 2182808 A GB2182808 A GB 2182808A
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GB
United Kingdom
Prior art keywords
rotor
stator
rotation
sphere
gap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08526804A
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GB8526804D0 (en
GB2182808B (en
Inventor
Karsten Laing
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Priority claimed from US06/668,772 external-priority patent/US4644208A/en
Application filed by Individual filed Critical Individual
Priority to GB8526804A priority Critical patent/GB2182808B/en
Publication of GB8526804D0 publication Critical patent/GB8526804D0/en
Publication of GB2182808A publication Critical patent/GB2182808A/en
Application granted granted Critical
Publication of GB2182808B publication Critical patent/GB2182808B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
    • H02K5/1282—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs the partition wall in the air-gap being non cylindrical

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

An electric motor having a spherical rotor (3) which extends axially at both ends beyond the central plane (2), whereby the output may be increased for a given diameter. <IMAGE>

Description

SPECIFICATION Electric motor having a spherical gap Electric motors in which the airgap between the rotor and the stator runs along a spherical surface, are increasing in importance. Motors of that kind are constructed with rotors which form geometrically hemispherical sections.
Since the stator exerts upon the rotor forces which are effective not only in the circumferential direction but are also directed axially, considerable axial forces have to be taken up by the bearing. This is one of the considerable disadvantages which stand in the way of the broadening of the new generation of motors.
The invention eliminates this disadvantage.
In accordance with the invention the rotor is made as a section of a sphere in which the diameter of the sphere no longer coincides with the one axial end of the rotor but lies between the two axial ends of the rotor.
Moreover the stator follows this contour only as far as that plane of rotation of the rotor the diameter of which corresponds with the diameter of the sphere minus twice the amount of the airgap. In the part of the stator extending beyond, its boundary runs cylindrically with respect to the rotor, the inner diameter of the cylinder corresponding with the diameter of the rotor.
In a variant upon the invention the stator follows the contour of the rotor as far as both axial ends of it. But the stator then has a divided execution and can only be assembled after introduction of the rotor.
The invention is to be described with the aid of Figures.
Figure 1 - shows a spherical motor in accordance with the invention, which forms one unit with a centrifugal pump and has a removable rotor; and Figure 2 - shows a variant upon the motor in which the rotor is trapped in both axial directions by re-entrant regions of the stator.
In Fig. 1 a section through the axis of rotation (1) is shown, of one half of a motor in which the motor forms one unit with a centrifugal pump. The greatest diameter of the rotor (3) referred to the axis of rotation (1) lies in the plane rotation (2) in which the centre (4) of the bearing ball (5) lies too. The dividing wall (7) lying in the airgap (6) to separate the stator and rotor runs along the arc between the planes of rotation (8) and (9) along a surface of a sphere, whilst the dividing wall (7) between the planes of rotation (9) and (10) and also in the region (11) following them runs cylindrically. The inner diameter of the dividing wall (7) coincides with the diameter (12) of the sphere. The rotor (3) can thereby be mounted coming from the left.The bearing on the stationary ball (5) is effected through the hub region (13) of the impeller (14) in which a step bearing (15) is mounted.
Fig. 2 shows an arrangement in which the dividing wall consists of the part (21) next the inlet side (20) and the part (27) next the pump side (22). Through the symmetrical distribution of flux no magnetic axial force becomes effective outwards upon the rotor (23) since the flux through the region (24) of the tooth (25) exactly corresponds with the flux in the region (26).
1. An electric motor having a gap for the magnetic flux of a predetermined gap width between the stator and the rotor and running along a spherical surface, characterized in that the magnetically effective surface of the rotor (3, 23) lies on a section of a sphere which referred to the plane of rotation lying in the centre (4) of the sphere extends in both axial directions.
2. An electric motor as in Claim 1, having a rotor which forms a section of a sphere and exhibits a first axial end having a greater diameter and a second having a smaller diameter, characterized in that the gap (6) for the magnetic flux is bounded towards the inside by the magnetically effective surface of the rotor (3) and towards the outside by the stator (25, 28) which follows the spherical surface of the rotor (3) at a clearance corresponding with the gap width of the gap (6) for the magnetic flux, the greatest inner clearance from the axis of rotation (1) iying in the plane of rotation (2) lying at the centre (4) of the sphere, and the clearance of the inner surface of the stator tapering again towards the first axial end of the rotor (3) down to a value which is less by twice the gap width of the gap for the magnetic flux than the clearance in the plane of rotation (2).
3. An electric motor as in Claim 1 or 2, characterized in that the inner boundary of the stator at the side next the first axial end of the rotor (3) continues into a cylindrical region (9, 10, 11).
4. An electric motor as in Claim 1, characterized in that the rotor (23) is enclosed by the stator (25).
5. An electric motor as in Claim 4, characterized in that in the gap for the magnetic flux a separating cup is arranged, which consists of two parts (21) and (27) which are connected together on the plane of rotation containing the centre of the sphere.
Amendments to the claims have been filed, and have the following effect: (a) Claims 1, 2 and 4 above have been deleted or textually amended.
*(b) New or textually amended claims have been filed as follows: CLAIMS 1. A pump unit comprising a centrifugal pump which has an impeller and which is inte
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Electric motor having a spherical gap Electric motors in which the airgap between the rotor and the stator runs along a spherical surface, are increasing in importance. Motors of that kind are constructed with rotors which form geometrically hemispherical sections. Since the stator exerts upon the rotor forces which are effective not only in the circumferential direction but are also directed axially, considerable axial forces have to be taken up by the bearing. This is one of the considerable disadvantages which stand in the way of the broadening of the new generation of motors. The invention eliminates this disadvantage. In accordance with the invention the rotor is made as a section of a sphere in which the diameter of the sphere no longer coincides with the one axial end of the rotor but lies between the two axial ends of the rotor. Moreover the stator follows this contour only as far as that plane of rotation of the rotor the diameter of which corresponds with the diameter of the sphere minus twice the amount of the airgap. In the part of the stator extending beyond, its boundary runs cylindrically with respect to the rotor, the inner diameter of the cylinder corresponding with the diameter of the rotor. In a variant upon the invention the stator follows the contour of the rotor as far as both axial ends of it. But the stator then has a divided execution and can only be assembled after introduction of the rotor. The invention is to be described with the aid of Figures. Figure 1 - shows a spherical motor in accordance with the invention, which forms one unit with a centrifugal pump and has a removable rotor; and Figure 2 - shows a variant upon the motor in which the rotor is trapped in both axial directions by re-entrant regions of the stator. In Fig. 1 a section through the axis of rotation (1) is shown, of one half of a motor in which the motor forms one unit with a centrifugal pump. The greatest diameter of the rotor (3) referred to the axis of rotation (1) lies in the plane rotation (2) in which the centre (4) of the bearing ball (5) lies too. The dividing wall (7) lying in the airgap (6) to separate the stator and rotor runs along the arc between the planes of rotation (8) and (9) along a surface of a sphere, whilst the dividing wall (7) between the planes of rotation (9) and (10) and also in the region (11) following them runs cylindrically. The inner diameter of the dividing wall (7) coincides with the diameter (12) of the sphere. The rotor (3) can thereby be mounted coming from the left.The bearing on the stationary ball (5) is effected through the hub region (13) of the impeller (14) in which a step bearing (15) is mounted. Fig. 2 shows an arrangement in which the dividing wall consists of the part (21) next the inlet side (20) and the part (27) next the pump side (22). Through the symmetrical distribution of flux no magnetic axial force becomes effective outwards upon the rotor (23) since the flux through the region (24) of the tooth (25) exactly corresponds with the flux in the region (26). CLAIMS
1. An electric motor having a gap for the magnetic flux of a predetermined gap width between the stator and the rotor and running along a spherical surface, characterized in that the magnetically effective surface of the rotor (3, 23) lies on a section of a sphere which referred to the plane of rotation lying in the centre (4) of the sphere extends in both axial directions.
2. An electric motor as in Claim 1, having a rotor which forms a section of a sphere and exhibits a first axial end having a greater diameter and a second having a smaller diameter, characterized in that the gap (6) for the magnetic flux is bounded towards the inside by the magnetically effective surface of the rotor (3) and towards the outside by the stator (25, 28) which follows the spherical surface of the rotor (3) at a clearance corresponding with the gap width of the gap (6) for the magnetic flux, the greatest inner clearance from the axis of rotation (1) iying in the plane of rotation (2) lying at the centre (4) of the sphere, and the clearance of the inner surface of the stator tapering again towards the first axial end of the rotor (3) down to a value which is less by twice the gap width of the gap for the magnetic flux than the clearance in the plane of rotation (2).
3. An electric motor as in Claim 1 or 2, characterized in that the inner boundary of the stator at the side next the first axial end of the rotor (3) continues into a cylindrical region (9, 10, 11).
4. An electric motor as in Claim 1, characterized in that the rotor (23) is enclosed by the stator (25).
5. An electric motor as in Claim 4, characterized in that in the gap for the magnetic flux a separating cup is arranged, which consists of two parts (21) and (27) which are connected together on the plane of rotation containing the centre of the sphere.
Amendments to the claims have been filed, and have the following effect: (a) Claims 1, 2 and 4 above have been deleted or textually amended.
*(b) New or textually amended claims have been filed as follows: CLAIMS
1. A pump unit comprising a centrifugal pump which has an impeller and which is inte gral with an induction motor whose stator is outside the pump chamber and whose rotor is inside the pump chamber and integral with the impeller, a dividing wall being provided between the stator and the rotor, the dividing wall extending along a spherical surface and having a larger diameter at the end facing the impeller than at the opposite end, the stator having a winding through which magnetically conductive teeth which are distributed over the circumference project and which define the conductive path for the magnetic flux between the rotor and a magnetic yoke, characterized in that the winding is arranged around the dividing wall (8), that the teeth (25) project through the winding, that at their inwardly directed boundary the teeth (25) extend over the entire axial length of the magnetically active part of the the rotor (23), and that, as viewed from the centre of the sphere (4), the rotor (23) extends in the direction of both axial ends.
2. For a pump unit according to Claim 1, an electric motor having a rotor which defines a section of a sphere and has a first axial end having a larger diameter and a second axial end having a smaller diameter, the motor being characterized in that the gap (6) for the magnetic flux is bounded inwardly by the magnetically effective surface of the rotor (3) and outwardly by the stator (25, 28) which follows the spherical surface of the rotor (3) at a clearance corresponding to the width of the gap (6) for the magnetic flux, the greatest inner clearance from the axis of rotation (1) lying in the plane of rotation (2) containing the centre (4) of the sphere, and the clearance of the inner surface of the stator tapering again towards the first axial end of the rotor (3) down to a value which is less by twice the width of the gap for the magnetic flux than the clearance in the plane of rotation (2).
4. For a pump unit according to Claim 1, an electric motor which is characterized in that the rotor (23) in enclosed by the teeth of the stator (25).
6. A pump unit according to Claim 1 and constructed, arranged and adapted to operate substantially as hereinbefore described with reference to, and as illustrated in, Fig. 1 or Fig. 2 of the accompanying diagrammatic drawings.
7. An electric motor according to Claim 2 and constructed, arranged and adapted to operate substantially as hereinbefore described with reference to, and as illustrated in, Fig. 1 or Fig. 2 of the accompanying diagrammatic drawings.
GB8526804A 1984-11-02 1985-10-31 Spherical gap electric motor Expired - Lifetime GB2182808B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8526804A GB2182808B (en) 1984-11-02 1985-10-31 Spherical gap electric motor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/668,772 US4644208A (en) 1984-11-02 1984-11-02 Stator having a spiral yoke
GB8526804A GB2182808B (en) 1984-11-02 1985-10-31 Spherical gap electric motor

Publications (3)

Publication Number Publication Date
GB8526804D0 GB8526804D0 (en) 1985-12-04
GB2182808A true GB2182808A (en) 1987-05-20
GB2182808B GB2182808B (en) 1990-04-18

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ID=26289959

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8526804A Expired - Lifetime GB2182808B (en) 1984-11-02 1985-10-31 Spherical gap electric motor

Country Status (1)

Country Link
GB (1) GB2182808B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0944158A2 (en) * 1998-03-16 1999-09-22 Lg Electronics Inc. Motor having air-gaps in various types
FR2816460A1 (en) * 2000-11-09 2002-05-10 Mannesmann Sachs Ag Drive device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1188941A (en) * 1966-06-10 1970-04-22 Scragg & Sons Electric Motor.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3231674A1 (en) * 1982-08-26 1984-03-01 Robert Bosch Gmbh, 7000 Stuttgart ELECTRIC MACHINE, ESPECIALLY AS A DRIVE FOR A CIRCUIT PUMP

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1188941A (en) * 1966-06-10 1970-04-22 Scragg & Sons Electric Motor.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0944158A2 (en) * 1998-03-16 1999-09-22 Lg Electronics Inc. Motor having air-gaps in various types
EP0944158A3 (en) * 1998-03-16 2001-01-31 Lg Electronics Inc. Motor having air-gaps in various types
FR2816460A1 (en) * 2000-11-09 2002-05-10 Mannesmann Sachs Ag Drive device
US6700280B1 (en) 2000-11-09 2004-03-02 Mannesmann Sachs Ag Drive unit with an electric machine

Also Published As

Publication number Publication date
GB8526804D0 (en) 1985-12-04
GB2182808B (en) 1990-04-18

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PCNP Patent ceased through non-payment of renewal fee