An electric machine for converting between electrical and rotary mechanical energy includes a rotor that is journalled to rotate about an axis of rotation, and an adjacent stator that magnetically exerts torque upon the rotor across a magnetic airgap in response to applied electric power to air core stator windings that are bonded in thermal contact to a slotless ferromagnetic stator backiron forming the stator surface facing the magnetic airgap, the rotor has a surface that is opposed to, and spaced apart from, the corresponding surface on the stator, the rotor surface and the stator surface define the airgap therebetween. The rotor has permanent magnets that generate magnetic flux across the magnetic airgap and through the air core stator windings. The air core windings are cooled by a physical loop having an evaporator, a remote located condenser and connected by two fluid flow lines filled with two phase fluid comprising liquid and gas both traveling in the same direction around the physical loop. The evaporator is constructed as an annulus co-annular with the rotor and located in thermal contact with the stator backiron and in thermal conduction indirectly with heat across the bond of the air core stator windings and through the stator backiron as heat is generated from the application of electric power; The evaporator transfers heat from the stator backiron to the fluid through phase change energy of the fluid, and the fluid is passively circulated to the condenser where the phase change energy is released remotely by convection of heat to ambient air, wherein the condenser is located at a higher elevation than the stator and the evaporator has two internal parallel fluid paths located on opposite diametral sides of the stator.

An electric machine for converting between electrical and rotary mechanical energy includes a rotor that is journalled to rotate about an axis of rotation, and an adjacent stator that magnetically exerts torque upon the rotor across a magnetic airgap in response to applied electric power to air core stator windings that are bonded in thermal contact to a slotless ferromagnetic stator backiron forming the stator surface facing the magnetic airgap, the rotor has a surface that is opposed to, and spaced apart from, the corresponding surface on the stator, the rotor surface and the stator surface define the airgap therebetween. The rotor has permanent magnets that generate magnetic flux across the magnetic airgap and through the air core stator windings. The air core windings are cooled by a physical loop having an evaporator, a remote located condenser and connected by two fluid flow lines filled with two phase fluid comprising liquid and gas both traveling in the same direction around the physical loop. The evaporator is constructed as an annulus co-annular with the rotor and located in thermal contact with the stator backiron and in thermal conduction indirectly with heat across the bond of the air core stator windings and through the stator backiron as heat is generated from the application of electric power; The evaporator transfers heat from the stator backiron to the fluid through phase change energy of the fluid, and the fluid is passively circulated to the condenser where the phase change energy is released remotely by convection of heat to ambient air, wherein the condenser is located at a higher elevation than the stator and the evaporator has two internal parallel fluid paths located on opposite diametral sides of the stator.

An electric motor having internal closed loop cooling includes a cooling chamber coupled to the stator cover of the electric motor. A fan is positioned to circulate air through the interior of the electric motor and the cooling chamber. A heat sink in the cooling chamber removes heat from the circulating air. The heat sink may be coupled to a fluid cooling jacket to transfer heat thereto or therefrom.

An electric motor having internal closed loop cooling includes a cooling chamber coupled to the stator cover of the electric motor. A fan is positioned to circulate air through the interior of the electric motor and the cooling chamber. A heat sink in the cooling chamber removes heat from the circulating air. The heat sink may be coupled to a fluid cooling jacket to transfer heat thereto or therefrom.

A vehicle seat comprises a seat bottom having a bottom cushion and a seat back coupled to the seat bottom with the seat back having a back cushion. At least one of the bottom cushion and the back cushion defines a passage. The vehicle seat further comprises a blower assembly coupled to one of the seat bottom and the seat back. The blower assembly comprises a housing and a stator, which is coupled to the housing and comprises a plurality of driving coils. The blower assembly further comprises a rotor rotatably coupled to the housing about a rotational axis, with the rotor comprising a plurality of permanent magnets arranged to generate a flux concentrated on the driving coils. The blower assembly further comprises an impeller coupled to the rotor to rotate about the rotational axis to generate a flow of air through the passage.

A fan motor housing including a circumferential motor housing having a radially outer surface and a radially inner surface and defining a primary axis including a first plurality of concentric flow channels disposed between the radially outer surface the radially inner surface, wherein the concentric flow channels extend in an axial direction parallel to the primary axis, a second plurality of concentric flow channels disposed between the radially outer surface and the radially inner surface, extending in an axial direction parallel to the primary axis, wherein the first and second pluralities of concentric flow channel are thermodynamically connected, a first plurality of radial conduits connecting the second plurality of flow channels to the radially inner surface of the motor housing, and a second plurality of radial conduits connecting the radially inner surface of the motor housing to the second plurality of flow channels.

A fan motor housing including a circumferential motor housing having a radially outer surface and a radially inner surface and defining a primary axis including a first plurality of concentric flow channels disposed between the radially outer surface the radially inner surface, wherein the concentric flow channels extend in an axial direction parallel to the primary axis, a second plurality of concentric flow channels disposed between the radially outer surface and the radially inner surface, extending in an axial direction parallel to the primary axis, wherein the first and second pluralities of concentric flow channel are thermodynamically connected, a first plurality of radial conduits connecting the second plurality of flow channels to the radially inner surface of the motor housing, and a second plurality of radial conduits connecting the radially inner surface of the motor housing to the second plurality of flow channels.

A dynamo-electric machine which inhibits the vibration of a frame and a bearing and has excellent manufacturability. A dynamo-electric machine according to the present invention includes a stator, a rotor including a rotary shaft and being disposed on an inner side in a radial direction of the stator, a bearing for supporting the rotary shaft, an intermediate frame for supporting the stator, and a stator frame for supporting the bearing and the intermediate frame. The stator frame includes pedestals at two end portions in a width direction of a bottom portion of the stator frame. Each of the pedestals includes an upper surface positioned above a bottom surface of the stator frame. The intermediate frame is fixed to upper surfaces of the pedestals.

A thyristor starter accelerates a synchronous machine from a stop state to a predetermined rotation speed by sequentially performing a first mode of performing commutation of an inverter by intermittently setting DC output current to zero and a second mode of performing commutation of the inverter by induced voltage of the synchronous machine. A second controller controls the firing phase of a thyristor in a converter such that DC output current of the converter matches a current command value, based on a detection signal of a position detector. In the first mode, the current command value is set such that the current value is higher as the rotation speed of the synchronous machine is higher.

An electric motor includes: a case; a stator including a stator core disposed inside the case and a stator coil wound around the stator core; a rotor including a rotating shaft and being configured to rotate with respect to the stator; and an oil spraying part that is configured to store oil in a lower part of the case, that includes an oil passage configured to guide the oil to an upper area of the case and an oil pump for pumping the oil, and that is configured to spray the oil to an inner heating part of the case. Accordingly, the oil can suppress occurrence of short-circuiting of an electric circuit and rapidly cool a heating part.