End winding arrangement for an electro-mechanical device

1. An end winding arrangement of a stator of an electro-mechanical device, the end winding arrangement comprising:

at least two stator bars, wherein each stator bar of the at least two stator bars comprises at least a linear member and a cell bend member, and wherein each stator bar of the at least two stator bars has a unitary involute member extending from the cell bend member; and

a connector member interconnecting a conductor accommodated inside each stator bar of the at least two stator bars,

wherein the conductor of each stator bar of the at least two stator bars has a linear part extending out of a free end of the respective unitary involute member, and

wherein the conductor of each stator bar of the at least two stator bars has a curved end with a cavity configured to form a lap joint with the respective other conductor.

2. The end winding arrangement of claim 1 , wherein each unitary involute member is configured without a lead bend section.

3. The end winding arrangement of claim 2 , wherein each unitary involute member is cantilevered at the cell bend member.

4. The end winding arrangement of claim 3 , wherein each unitary involute member has a developed length in a range of 15% to 60% of a developed length of the respective stator bar.

5. The end winding arrangement of claim 1 , wherein each unitary involute member is cantilevered at the cell bend member.

6. The end winding arrangement of claim 1 , wherein each unitary involute member has a developed length in a range of 15% to 60% of a developed length of the respective stator bar.

7. The end winding arrangement of claim 1 , wherein the connector member is has a non-twisted configuration.

8. The end winding arrangement of claim 1 , wherein a configuration of the connector member is selected based on the conductors being connected.

9. A stator for an electro-mechanical device, the stator comprising:

a frame;

a stator core attached to the frame; and

an end winding arrangement extending from the stator core, the end winding arrangement comprising:

at least two stator bars, wherein each stator bar of the at least two stator bars comprises at least a linear member and a cell bend member; and wherein each stator bar of the at least two stator bars has a unitary involute member extending from the cell bend member; and

a connector member interconnecting a conductor accommodated inside each stator bar of the at least two stator bars,

wherein the conductor of each stator bar of the at least two stator bars has a linear part extending out of a free end of the respective unitary involute member, and

wherein the conductor of each stator bar of the at least two stator bars has a curved end with a cavity configured to form a lap joint with the respective other conductor.

10. An electro-mechanical device comprising:

a rotor; and

a stator comprising:

a frame;

a stator core attached to the frame; and

an end winding arrangement extending from the stator core, the end winding arrangement comprising:

at least two stator bars, wherein each stator bar of the at least two stator bars comprises at least a linear member and a cell bend member, and wherein each stator bar of the at least two stator bars has a unitary involute member extending from the cell bend member; and

a connector member interconnecting a conductor accommodated inside each stator bar of the at least two stator bars,

wherein the conductor of each stator bar of the at least two stator bars has a linear part extending out of a free end of the respective unitary involute member, and

wherein the conductor of each stator bar of the at least two stator bars has a curved end with a cavity configured to form a lap joint with the respective other conductor.

11. The electro-mechanical device of claim 10 , wherein the electro-mechanical device is electric generator and an electric motor.