Rotor for electric motor, compressor unit provided with rotor, method for producing a rotor for an electric motor
First Claim
Patent Images
1. An electric motor, comprising:
- an electric motor stator;
an electric motor rotor having a substantially cylindrical core, made from a core material and having a plurality of longitudinal grooves extending substantially parallel to an axis of the cylinder;
a plurality of conductive rods made from an electrically conductive material and arranged in the longitudinal grooves;
two short-circuit rings that conductively connect axial ends of the conductive rods to one another;
a diffusion layer extending between the conductive rods and the cylindrical core and comprising a diffusion material that is different from the core material and the electrically conductive material of the conductive rods;
wherein the electric motor rotor forms a common rotor shaft with a compressor rotor;
wherein the common rotor shaft is mounted on magnetic radial bearings;
wherein the compressor rotor includes at least one impeller;
wherein the electric motor rotor, compressor rotor, common rotor shaft, magnetic radial bearings, and at least one impeller are accommodated in a common gastight housing;
wherein the electric motor stator is provided in a gastight housing area which includes a stator space surrounding the cylindrical core, the stator space being formed by a wall section of the gastight housing and a partition, the stator space being provided with a dedicated cooling circuit having a pump, a cooling medium, and a heat exchanger solely for use within the stator space,wherein the cooling medium circulates through the cooling circuit in direct contact with the stator, andwherein a separate cooling medium circulates through cooling system lines to cool the electric motor rotor, compressor rotor, common rotor shaft, and magnetic radial bearings.
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Abstract
A rotor for an electric motor according to the invention comprises a substantially cylindrical core, conductive rods and two short-circuit rings. The cylindrical core is formed from a core material and provided with a plurality of longitudinal grooves which extend substantially in the direction of the cylinder axis. The conductive rods are formed from an electrically conductive material and are provided in the longitudinal grooves of the cylindrical core. The two short-circuit rings conductively connect the axial ends of the conductive rods to one another. A diffusion layer extends between the conductive rods and the cylindrical core. The diffusion layer comprises a diffusion material.
10 Citations
17 Claims
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1. An electric motor, comprising:
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an electric motor stator; an electric motor rotor having a substantially cylindrical core, made from a core material and having a plurality of longitudinal grooves extending substantially parallel to an axis of the cylinder; a plurality of conductive rods made from an electrically conductive material and arranged in the longitudinal grooves; two short-circuit rings that conductively connect axial ends of the conductive rods to one another; a diffusion layer extending between the conductive rods and the cylindrical core and comprising a diffusion material that is different from the core material and the electrically conductive material of the conductive rods; wherein the electric motor rotor forms a common rotor shaft with a compressor rotor; wherein the common rotor shaft is mounted on magnetic radial bearings; wherein the compressor rotor includes at least one impeller; wherein the electric motor rotor, compressor rotor, common rotor shaft, magnetic radial bearings, and at least one impeller are accommodated in a common gastight housing; wherein the electric motor stator is provided in a gastight housing area which includes a stator space surrounding the cylindrical core, the stator space being formed by a wall section of the gastight housing and a partition, the stator space being provided with a dedicated cooling circuit having a pump, a cooling medium, and a heat exchanger solely for use within the stator space, wherein the cooling medium circulates through the cooling circuit in direct contact with the stator, and wherein a separate cooling medium circulates through cooling system lines to cool the electric motor rotor, compressor rotor, common rotor shaft, and magnetic radial bearings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electric motor, comprising:
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an electric motor stator; an electric motor rotor comprising; a substantially cylindrical core, made from a core material and having a plurality of longitudinal grooves extending substantially parallel to the cylinder axis, a plurality of conductive rods made from an electrically conductive material and arranged in the longitudinal grooves, two short-circuit rings that conductively connect axial ends of the conductive rods to one another, and a diffusion layer extending between the conductive rods and the cylindrical core and comprising a diffusion material that is different from the core material and the electrically conductive material of the conductive rods; and wherein a cross-section of each of the conductive rods has two substantially straight parallel walls and further includes a first rounding and a second rounding respectively along a first other side and a second other side of the respective conductive rod such that the two parallel walls and the first and second other sides form the perimeter of the respective conductive rod, wherein the electric motor rotor forms a common rotor shaft with a compressor rotor; wherein the common rotor shaft is mounted on magnetic radial bearings; wherein the compressor rotor includes at least one impeller; wherein the electric motor rotor, compressor rotor, common rotor shaft, magnetic radial bearings, and at least one impeller are accommodated in a common gastight housing; wherein the electric motor stator is provided in a gastight housing area which includes a stator space surrounding the cylindrical core of the rotor, the stator space being formed by a wall section of the gastight housing and a partition, the stator space being provided with a dedicated cooling circuit having a pump, a cooling medium, and a heat exchanger solely for use within the stator space, wherein the cooling medium circulates through the cooling circuit in direct contact with the stator space, and wherein a separate cooling medium circulates through cooling system lines to cool the electric motor rotor, compressor rotor, common rotor shaft, and magnetic radial bearings. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification