Turbomachine systems with magnetic bearing cooling and method

A turbomachine system comprising:

• a compressor configured to process a fluid, the compressor comprising a compressor rotor having a compressor shaft with a first shaft end and a second shaft end, the compressor shaft supported by active magnetic bearings for rotation in a compressor casing, the first shaft end extending outside the compressor casing;
• an electric motor configured to rotate the compressor rotor, the electric motor comprising a stator housed in a motor casing and a rotor supported for rotation in the motor casing, the rotor having a motor shaft extending from the motor casing and drivingly coupled with the first shaft end of the compressor shaft;
• a first closed cooling circuit configured to circulate a cooling fluid therein and fluidly coupled to the active magnetic bearings of the compressor, the first closed cooling circuit comprising an impeller mounted inside the compressor casing on the compressor shaft at the second shaft end for rotation therewith and configured to circulate the cooling fluid in the first closed cooling circuit to cool the active magnetic bearings of the compressor;
• a second closed cooling circuit configured to circulate a cooling fluid therein and fluidly coupled to the electric motor, the second closed cooling circuit comprising a circulation fan arranged in the motor casing and configured to circulate the cooling fluid entering the motor casing from the second closed cooling circuit to cool the electric motor;
• a source of cooling fluid fluidly coupled to the first closed cooling circuit and to the second closed cooling circuit to restore a cooling fluid pressure in the respective closed cooling circuit;
• and
• a pressure reduction device is arranged between the cooling fluid source and the first closed cooling circuit,
• wherein the first closed loop cooling circuit is fluidly separated from the second closed loop cooling circuit, the fluid processed by the turbomachine is different than the cooling fluid respectively supplied to and circulating in the first closed cooling circuit and the second closed cooling circuit, and the cooling fluid source provides cooling fluid at a first pressure higher than a second pressure in the first closed cooling circuit.

A turbomachine system comprising:

• a turbomachine configured to process a fluid, the turbomachine comprising a turbomachine rotor having a turbomachine shaft with a first shaft end and a second shaft end, the turbomachine shaft being supported by active magnetic bearings for rotation in a turbomachine casing, and the first shaft end extending outside the turbomachine casing;
• a rotary machine coupled to the first shaft end of the turbomachine shaft to drive the turbomachine, the rotary machine housed in a rotary machine casing separated from the turbomachine casing;
• a shaft line extending between the turbomachine casing and the rotary machine casing drivingly connects the turbomachine to the rotary machine;
• a first closed cooling circuit configured to circulate a cooling fluid therein and fluidly coupled to the active magnetic bearings and to a cooling fluid source configured to restore a cooling fluid pressure in the first closed cooling circuit, the first closed cooling circuit comprising a cooling fluid impeller rotatably mounted on the turbomachine shaft at the second shaft end inside the turbomachine casing and driven by the rotary machine, the cooling fluid impeller configured to circulate the cooling fluid in the first closed cooling circuit to cool the active magnetic bearings;
• a second closed cooling circuit configured to circulate a cooling fluid therein and fluidly coupled to the rotary machine and to the cooling fluid source, the second closed cooling circuit comprising a circulation fan to circulate the cooling fluid entering the rotary machine casing from the second closed cooling circuit to cool the rotary machine;
• and
• a non-return device configured to prevent leakage of cooling fluid from the first closed cooling circuit to the second closed cooling circuit,
• wherein the first closed loop cooling circuit is fluidly separated from the second closed loop cooling circuit, and the fluid processed by the turbomachine is different than the cooling fluid respectively supplied to and circulating in the first closed cooling circuit and the second closed cooling circuit.

A turbomachine system comprising:

• a compressor configured to process a fluid, the compressor comprising a compressor rotor having a compressor shaft with a first shaft end and a second shaft end, the compressor shaft supported by active magnetic bearings for rotation in a compressor casing, the first shaft end extending outside the compressor casing;
• an electric motor configured to rotate the compressor rotor, the electric motor comprising a stator housed in a motor casing and a rotor supported for rotation in the motor casing, the rotor having a motor shaft extending from the motor casing and drivingly coupled with the first shaft end of the compressor shaft;
• a first closed cooling circuit configured to circulate a cooling fluid therein and fluidly coupled to the active magnetic bearings of the compressor, the first closed cooling circuit comprising an impeller mounted inside the compressor casing on the compressor shaft at the second shaft end for rotation therewith and configured to circulate the cooling fluid in the first closed cooling circuit to cool the active magnetic bearings of the compressor;
• a second closed cooling circuit configured to circulate a cooling fluid therein and fluidly coupled to the electric motor, the second closed cooling circuit comprising a circulation fan arranged in the motor casing and configured to circulate the cooling fluid entering the motor casing from the second closed cooling circuit to cool the electric motor;
• a source of cooling fluid fluidly coupled to the first closed cooling circuit and to the second closed cooling circuit to restore a cooling fluid pressure in the respective closed cooling circuit;
• and
• a non-return device configured to prevent leakage of cooling fluid from the first closed cooling circuit to the second closed cooling circuit,
• wherein the first closed loop cooling circuit is fluidly separated from the second closed loop cooling circuit, and the fluid processed by the turbomachine is different than the cooling fluid respectively supplied to and circulating in the first closed cooling circuit and the second closed cooling circuit.