Rotor arrangement for an electrical drive motor of a compressor, particularly a refrigerant compressor
The invention concerns a rotor arrangement for an electrical drive motor of a compressor, particularly a refrigerant compressor, with a rotor having a rotor lamination of stacked sheet plates, and a shaft, which is inserted in an axial recess of the rotor lamination and is unrotatably connected with the rotor lamination, the recess being formed by openings in adjacent sheet plates. It is endeavoured to simplify the manufacturing of such rotor arrangements. For this purpose, it is ensured that openings of different sizes are provided in the sheet plates, at least two sheet plates forming a first group, each having an opening, which is smaller than the cross-section of the shaft, the remaining sheet plates forming a second group, each having an opening, which is larger than the cross-section of the shaft.
1. A rotor arrangement for an electrical drive motor of a compressor, comprising:
a rotor having a rotor lamination of stacked sheet plates, an axial recess of the rotor lamination being formed by openings in adjacent sheet plates; and
a drive shaft inserted in the axial recess of the rotor lamination and unrotatably connected with the rotor lamination;
wherein openings of different sizes are provided in the sheet plates, at least two sheet plates forming a first group, each having an opening, which is elastically widened and conically deformed around the shaft, the remaining sheet plates forming a second group, each having an opening, which is larger than the cross-section of the shaft.
2. The rotor arrangement according to claim 1 , wherein at least the openings in the sheet plates of the first group and the cross-section of the shaft are circular.
3. The rotor arrangement according to claim 1 , wherein the opening edges of the sheet plates in the first group are hooked on the surface of the shaft against the direction of pushing.
4. The rotor arrangement according to claim 1 , wherein sheet plates in the first group are located in the area of the axial ends of the rotor lamination.
5. The rotor arrangement according to claim 4 , wherein at least one sheet plate of the first group is located in the area of the axial centre of the rotor lamination.
6. The rotor arrangement according to claim 1 , wherein the shaft has at least one indentation, in which a sheet plate of the first group engages.
7. The rotor arrangement according to claim 6 , wherein the indentation has the form of a circumferential groove.
8. The rotor arrangement according to claim 6 , wherein the indentation is located at the end of the rotor lamination, which will first overlap with the shaft during mounting on the shaft.
9. The rotor arrangement according to claim 1 , wherein sheet plates of the first group bear on each other in pairs.