Hermatically sealed motor blower unit with stator inside hollow armature

An electric motor comprising, in combination, a sealed housing having a thrust plate formed therein and having a re-entrant wall forming a central cavity in said housing, a rotor mounted within said housing, said rotor comprising a motor-rotor embracing said central cavity and a thrust collar adapted to cooperate with said thrust plate to support the axial thrust of said rotor and a motor-stator mounted in said cavity for cooperating with said motor-rotor to rotate said rotor, the portion of said re-entrant wall between said motor-stator and motor-rotor being made relatively thin to minimize electrical losses in said motor.

An electric motor comprising, in combination, a sealed housing having a thrust plate formed therein and having a re-entrant wall forming a central cavity in said housing, a rotor mounted within said housing, said rotor comprising a motor-rotor embracing said central cavity and a thrust collar adapted to cooperate with said thrust plate to support the axial thrust of said rotor, a journal bearing within said housing for supporting the radial load of said rotor, and a motor-stator located within said central cavity and cooperating through a portion of said re-entrant wall with said motor-rotor to rotate said rotor, the portion of said re-entrant wall between said motor-stator and motor-rotor being made relatively thin to reduce electrical losses.

An electric motor comprising, in combination, a sealed housing having a thrust plate formed therein and having a re-entrant wall forming a central cavity in said housing, said thrust plate having a recessed bearing surface, a rotor mounted within said housing, said rotor comprising a motor-rotor embracing said cavity and a thrust collar having a bearing surface adapted to cooperate with said recessed bearing surface to support the axial thrust of said rotor, one or more journal bearings within said housing for supporting the radial load of said rotor, and a motor-stator mounted within said cavity and adapted to cooperate through a relatively thin portion of said re-entrant wall with said motor-rotor to rotate said rotor.

An electric motor comprising, in combination, a sealed housing having a thrust plate mounted therein and having a re-entrant wall forming a central cavity in said housing, a rotor mounted within said housing for rotation about a vertical axis, said rotor comprising a motor-rotor embracing said cavity and a thrust collar adapted to cooperate with said thrust plate to form a thrust bearing supporting said rotor, a motor-stator mounted within said cavity and adapted to cooperate through a relatively thin portion of said re-entrant wall with said motor-rotor to rotate said rotor, and lifting means for temporarily lifting said rotor until the speed of said rotor is sufficient to cause said thrust bearing to support said rotor.

An electric motor comprising, in combination, a sealed housing having a thrust plate mounted therein and having a re-entrant wall forming a central cavity in said housing, a rotor mounted within said housing for rotation about a vertical axis, said rotor comprising a motor-rotor embracing said cavity and a thrust collar adapted to cooperate with said thrust plate to form a thrust bearing supporting said rotor, a motor-stator mounted within said cavity and adapted to cooperate through said re-entrant wall with said motor-rotor to rotate said rotor, lifting means for temporarily lifting said rotor until the speed of said rotor is sufficient to cause said thrust bearing to support said rotor, said lifitng means comprising a ball bearing adapted to support said rotor, a vertically movable supporting member for supporting said ball bearing, and means for moving said supporting member up and down to cause said ball bearing to engage and disengage said rotor as desired.

An electric motor comprising, in combination, a sealed housing having a thrust plate formed therein and having a re-entrant wall forming a central cavity in said housing, a rotor within said housing, said rotor comprising a motor-rotor embracing said re-entrant wall and a thrust collar adapted to cooperate with said thrust plate to support the axial thrust of said rotor, a motor-stator within said cavity adapted to cooperate through a portion of said re-entrant wall with said motor-rotor to rotate said rotor;

• and cooling means for cooling said motor-stator and through said re-entrant wall said rotor.

An electric motor comprising, in combination, a sealed housing having a thrust plate formed therein and having a re-entrant wall forming a central cavity in said housing, a rotor within said housing, said rotor comprising a motor-rotor embracing said re-entrant wall and a thrust collar adapted to cooperate with said thrust plate to support the axial thrust of said rotor, a motor-stator within said cavity adapted to cooperate through a relatively thin portion of said re-entrant wall with said motor-rotor to rotate said rotor, and cooling means for cooling said motor-stator, said cooling means comprising a coolant supply conduit for supplying a coolant to the interior of said cavity and to said motor-stator and an axial tube for removing said coolant from the inner portion of said cavity.

An electric motor comprising, in combination, a sealed housing having a re-entrant wall forming a central cavity in said housing, a hollow shaft located in a well of said housing and partially embracing said cavity, motor means for rotating said shaft, said motor means comprising a motor-stator located within said cavity, a motor-rotor mounted on the inner surface of said hollow shaft and a relatively thin diaphragm forming part of said re-entrant wall and located between said motor-stator and motor-rotor, first cooling means for cooling said cavity and through said diaphragm said shaft, and second cooling means for cooling the exterior of said wall and through said wall said shaft.

An electric motor comprising, in combination, a sealed housing having a re-entrant wall forming a central cavity in said housing, a hollow shaft located in a well of said housing and partially embracing said cavity, motor means for rotating said shaft, said motor means comprising a motor-stator located within said cavity, a motor-rotor mounted on the inner surface of said hollow shaft and a relatively thin diaphragm forming part of said re-entrant wall and located between said motor-stator and motor-rotor, first cooling means comprising a coolant supply conduit for supplying a coolant to the interior of said cavity and to said motor-stator and an axial tube extending into said cavity for removing coolant from the interior of said cavity, and second cooling means comprising a chamber formed in said housing adjacent said well and coolant inlet and outlet means for supplying coolant to said chamber, said first and second cooling means cooperating to cool said hollow shaft from both the inside and outside thereof.

A hermetically sealed motor blower unit comprising, in combination, a sealed housing having a thrust plate formed therein and having a re-entrant wall forming a central cavity in said housing, a rotor mounted within said housing, said rotor comprising an impeller, a motor-rotor embracing said cavity and a thrust collar adapted to cooperate with said thrust plate to support the axial thrust of said rotor, electric motor means for rotating said rotor, said motor means comprising said motor-rotor, a motor-stator positioned within said cavity and a relatively thin diaphragm forming part of said re-entrant wall and located between said motor-stator and said motor-rotor, the bearing surfaces of said thrust plate and thrust collar being in free communication with the discharge of said impeller, whereby fluid pumped by said impeller can flow directly to said bearing surfaces to lubricate them.

A hermetically sealed motor blower unit comprising, in combination, a sealed housing having a thrust plate formed therein and having a re-entrant wall forming a central cavity in said housing, a rotor mounted within said housing, said rotor comprising an impeller, a hollow shaft embracing said cavity and a thrust collar adapted to cooperate with said thrust plate to support the axial thrust of said shaft, and electric motor means for rotating said rotor, said motor means comprising a motor-stator within said cavity, a motor-rotor mounted in said rotor, and a relatively thin diaphragm forming part of said re-entrant wall and located between said motor-stator and motor-rotor, the bearing surfaces of said thrust plate and thrust collar being in free communication with the discharge of said impeller, whereby fluid pumped by said impeller can flow directly to said bearing surfaces to lubricate them.

A hermetically sealed motor blower unit comprising, in combination, a sealed housing having a thrust plate mounted therein and having a re-entrant wall forming a central cavity in said housing, a rotor within said housing, said rotor comprising an impeller, a hollow shaft embracing said cavity and a thrust collar adapted to cooperate with said thrust plate to support the axial thrust of said shaft, one or more journal bearings within said housing for supporting the radial load of said shaft and electric motor means for rotating said rotor, said motor means comprising a motor-stator located within said cavity and adapted to cooperate through a portion of said re-entrant wall with a motor-rotor mounted within said hollow shaft, the portion of said re-entrant wall located between said motor-stator and said motor-rotor being made relatively thin to reduce electrical losses, the bearing surfaces of said thrust plate, thrust collar and journal bearings being in communication with the discharge of said impeller, whereby fluid pumped by said impeller can flow directly to said bearing surfaces to lubricate them.