Thermal management for generator/ motor stators

An electrical machine assembly comprising:

• a stator including:
• a core;
• windings assembled into the core;
• a back iron heat exchanger mounted to the core;
• a first end plate mounted at a first end of the core and back iron heat exchanger in thermal communication with the first end of the core;
• and
• a second end plate mounted at a second end of the core and back iron heat exchanger opposite the first end plate in thermal communication with the second end of the core,
• wherein a first coolant circuit passes from a coolant inlet in the back iron heat exchanger, through the back iron heat exchanger, into the first end plate, out of the first end plate, through the core, into the second end plate, and out of the second end plate,
• wherein a second coolant circuit passes from the coolant inlet in the back iron heat exchanger, through the back iron heat exchanger, into the second end plate, out of the second end plate, through the core, into the first end plate, and out of the first end plate, wherein the first and second coolant circuits have no other inlet into the back iron heat exchanger besides the coolant inlet.