Air cycle machine with axial rotors and integrated cabin air compressor

An air cycle machine (ACM),

• comprising:
• a motor having a front end and an aft end;
• a compressor coupled to the front end of the motor;
• a turbine coupled to the aft end of the motor;
• a shell having a shell front part that surrounds the compressor and defines a shell inlet, a shell aft part that surrounds the turbine and defines a shell outlet, and a shell middle part that surrounds the motor, wherein an outer flow passage is defined within the shell, surrounding the compressor, the motor and the turbine;
• a shaft extending between the compressor and the turbine to define a shaft front end that is coupled to the compressor, and a shaft aft end that is coupled to the turbine;
• and the motor includes a rotor that is mounted to the shaft, and
• wherein the motor has a motor case that includes a first front conical end that diverges aft of the shell front part, a first aft conical end that converges aft toward the shell aft part, and first middle portion that is cylindrical;
• and the shell middle part has a second front conical end that diverges around the first front conical end of the motor case, a second aft conical end that converges around the first aft conical end of the motor case, and a second middle portion disposed around the first middle portion of the motor case and is cylindrical.