Synchronous electric motor, particularly for submersible pumps, and pump including the motor
First Claim
1. A synchronous electric motor, particularly for submersible pumps, comprising:
- a stator lamination pack having a plurality of laminations and being substantially U-shaped, said stator lamination pack farther having a pair of elements parallel to a stator axis;
at least one electric winding wound around the stator lamination pack;
a rotor disposed between the pair of elements of the stator and made of a material with high magnetic retentivity, the rotor having an axis of rotation parallel to the stator axis;
wherein said elements have free end portions substantially extending along a full length of said rotor;
wherein the rotor is disposed in a center area between the pair of elements, the laminations have a height perpendicular to the axis of rotation, and the height of the laminations surrounding the center area is reduced, creating a longitudinally stepped cavity in the lamination pack with at least one longitudinal step that contains the rotor; and
wherein the laminations of the stator lamination pack, including the laminations of the pair of elements and the laminations of the free end portions enclosing the rotor, extend only in a parallel direction with respect to the rotor axis of rotation so as to limit a transverse dimension of the motor perpendicular to the rotor axis.
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Accused Products
Abstract
A synchronous electric motor includes a stator lamination pack (2) provided with at least one electric winding (6, 6'"'"') and a rotor (3) wade of a material with high magnetic retentivity. The laminations (4) of the pack (2) are arranged parallel to the axis of the rotor (Z) to limit the transverse dimension of the motor (1). The lamination pack (2) is U-shaped, with straight segments (5, 5'"'"') on which windings (6,6'"'"') are formed. The axes of their turns are substantially parallel to the axis (Z) of the rotor (3). At the segments (5, 5'"'"') the laminations (4) have different heights along a direction (X) which is transverse to the axis (Z) of the rotor (3). The lamination pack (2), together with its windings, is embedded in a matrix (12) of insulating resin, which is in turn enclosed tight within a substantially rigid container (11) made of dielectric material, forming a sealed modular capsule. This capsule can be coupled to rotor units of different types to form submersible pumps.
106 Citations
22 Claims
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1. A synchronous electric motor, particularly for submersible pumps, comprising:
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a stator lamination pack having a plurality of laminations and being substantially U-shaped, said stator lamination pack farther having a pair of elements parallel to a stator axis; at least one electric winding wound around the stator lamination pack; a rotor disposed between the pair of elements of the stator and made of a material with high magnetic retentivity, the rotor having an axis of rotation parallel to the stator axis; wherein said elements have free end portions substantially extending along a full length of said rotor; wherein the rotor is disposed in a center area between the pair of elements, the laminations have a height perpendicular to the axis of rotation, and the height of the laminations surrounding the center area is reduced, creating a longitudinally stepped cavity in the lamination pack with at least one longitudinal step that contains the rotor; and wherein the laminations of the stator lamination pack, including the laminations of the pair of elements and the laminations of the free end portions enclosing the rotor, extend only in a parallel direction with respect to the rotor axis of rotation so as to limit a transverse dimension of the motor perpendicular to the rotor axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A modular stator capsule for axially extending synchronous electric motors, comprising:
a substantially rigid container made of dielectric material and having a stator pack including magnetizing windings and a pair of elements, said magnetizing windings each having a winding axis and being wound on said pair of elements, each winding axis substantially parallel to a main axis of the stator pack, the stator pack being enclosed and sealed in the container and embedded in a matrix of insulating resin, the substantially rigid container having an axial end with a cylindrical cavity which extends between the pair of elements of the stator pack and is constructed and arranged so as to freely accommodate a rotor having an axis of rotation, the substantially rigid container having a second end opposite the axial end that comprises a substantially flat wall. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22)
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20. The submersible pump according to claim 20, wherein the delivery duct extends axially toward the cylindrical cavity of the modular stator capsule, so as to form a centrifugal pump with reversed axial flow.
Specification