Electrical machines and assemblies including a yokeless stator with modular lamination stacks

A wind turbine comprising:

• a wind turbine generator, the generator comprising:
• a rotor with an inner rotor portion and an outer rotor portion;
• and
• a double-sided yokeless stator comprising modular lamination stacks and configured for radial magnetic flux flow,
• wherein the double-sided yokeless stator is concentrically disposed between the inner rotor portion and the outer rotor portion of the wind turbine generator.

A generator for a wind turbine comprising:

• a rotor with an inner rotor portion and an outer rotor portion;
• and
• a double-sided yokeless stator comprising modular lamination stacks and configured for radial magnetic flux flow,
• wherein the double-sided yokeless stator is concentrically disposed between the inner rotor portion and the outer rotor portion of the wind turbine generator.

A ship propulsion motor comprising:

• a rotor with an inner rotor portion and an outer rotor portion;
• and
• a double-sided yokeless stator comprising a plurality of modular lamination stacks and configured for radial magnetic flux flow,
• wherein the double-sided stator is concentrically disposed between the inner rotor portion and the outer rotor portion of the ship propulsion motor.

A method of servicing a generator for wind turbine, the method comprising:

• removing a piece of end ring from a multi-piece end ring;
• and
• removing a core pack for servicing an individual lamination stack,
• wherein a removable window is provided in a stator frame to access the core pack, and
• wherein the generator comprises:
• at least one rotor with an inner rotor portion and an outer rotor portion;
• at least one double-sided yokeless stator comprising a plurality of modular lamination stacks and configured for radial magnetic flux flow;
• and
• at least two multi-piece end rings substantially surrounding the double-sided yokeless stator for increasing mechanical stiffness,
• wherein the lamination stacks are arranged as different core packs, each core pack comprising one or more modular lamination stacks.