Abstract: A driver (41) for driving a rotary motor (20) directly connected to a rotating shaft member of a supercharger is mounted on a board (39) together with a control device (51) and a heat sink (39a) and is housed in an engine room. Even when a temperature (ambient temperature) in the engine room detected by a temperature sensor (47b) rises up to an upper limit temperature (upper limit ambient temperature) of the ambient temperature, if a temperature (driver temperature) of a portion of the driver (41) that has a highest temperature detected by a temperature sensor (47a) is yet to rise to an upper limit temperature (upper limit internal temperature) of the driver temperature, the control device (51) causes the rotary motor (20) to continue to drive as the motor while lowering an upper limit of an output current.

Abstract: The invention is characterized in that in a motor rotor constituted by a motor shaft (30), a permanent magnet (31) surrounding the motor shaft (30) around an axis, a pair of end rings (32, 32) surrounding the motor shaft (30) around the axis and pinching the permanent magnet (31) from both sides in an axial direction, and a hollow cylindrical outer sleeve (33) surrounding the permanent magnet (31) and a pair of end rings (32, 32) in a fastening state around the axis, one end portion or both end portions of the outer sleeve (33) protrudes in the axial direction than an end surface of the end ring (32). A rotating balance correction is executed by pruning away a part of the protruding portion.

Abstract: A motor stator (24) has a stator iron core (24a), a stator winding (24b), and a mold member (30) embedding them in an inner portion and having a high coefficient of thermal conductivity. The mold member (30) has a heat insulating layer (32) closely attached to an inner surface thereof surrounding a motor rotor (22) and to an outer surface thereof in an axial direction. Further, an outer sleeve (26) is provided so as to be closely attached to an outer peripheral surface of the mold member (30) and to an inner surface of a bearing housing (16). The outer sleeve (26) forms a liquid tight water cooling jacket (26b) between the outer sleeve and the bearing housing.

Abstract: A motor-driven supercharger is provided with a stator assembly inserted and attached to a bearing housing, and a seal plate closely attached to a compressor side of the stator assembly and comparting between a compressor housing and a motor stator (24). The stator assembly has the motor stator and an outer sleeve having an inner peripheral surface closely attached to an outer peripheral surface of the motor stator and supporting the motor stator in such a manner as to constrain a rotation of the motor stator, wherein the motor stator and the outer sleeve form an integral part so as to construct the stator assembly, and the outer sleeve constructs a liquid tight water cooling jacket between the outer sleeve and the bearing housing. The outer sleeve and the seal plate are fastened together in an axial direction between the bearing housing and the compressor housing.

Abstract: A motor-driven supercharger is provided with a turbine shaft (12) having a turbine impeller (11) in one end, a compressor impeller (14) rotationally driven by the turbine shaft, a housing surrounding the turbine impeller, the turbine shaft and the compressor impeller, a motor stator (24) fixed within the housing, and a motor rotor (22) rotationally driven by the motor stator. The motor rotor (22) is fixed to an inner diameter side of the compressor impeller (14) in accordance with a fitting.

Abstract: A motor-driven supercharger is provided with a thrust bearing (30) rotatably supporting a thrust force applied to a turbine shaft (12). The thrust bearing (30) is constituted by a small-diameter disc-shaped thrust collar (32) rotating together with a turbine shaft, and a turbine side thrust bearing (34) and a compressor side thrust bearing (36) which block a movement in an axial direction of the thrust collar. The compressor side thrust bearing (36) has a small-diameter ring portion (37) including a thrust surface which is in contact with the thrust collar and has approximately an equal diameter, and a flange portion (38a) fixed to a housing (16) in the turbine side, and the small-diameter ring portion and the flange portion are arranged at different positions in an axial direction.

Abstract: A motor rotor (22) includes a motor shaft (30), a permanent magnet (319) surrounding the motor shaft (30) around an axis, a pair of end rings (32, 32) surrounding the motor shaft (30) around the axis and sandwiching the permanent magnet (32) from both sides in an axial direction, and a hollow cylindrical outer sleeve (33) fitted to the permanent magnet (31) and a pair of end rings (32) in accordance with a stationary fit. A longitudinal elastic modulus of the end ring (32) is larger than a longitudinal elastic modulus of the permanent magnet (32). A thickness of the outer sleeve (33) is different in correspondence to a position in the axial direction in such a manner as to make uniform a circumferential stress applied to the outer sleeve (33) fitted to the permanent magnet (32) and a pair of end rings (32) in the axial direction.

Abstract: A motor-driven supercharger is provided with a stator assembly (29) inserted and attached to a bearing housing (16), and a seal plate (28) closely attached to a compressor side of the stator assembly (29) and comparting between a compressor housing (20) and a motor stator (24). The stator assembly (29) has the motor stator (24) and an outer sleeve (26) having an inner peripheral surface closely attached to an outer peripheral surface of the motor stator (24) and supporting the motor stator (24) in such a manner as to constrain a rotation of the motor stator (24), the motor stator (24) and the outer sleeve (26) form an integral part so as to construct the stator assembly (29), and the outer sleeve (26) constructs a liquid tight water cooling jacket between the outer sleeve and the bearing housing. The outer sleeve (26) and the seal plate (28) are fastened together in an axial direction between the bearing housing (16) and the compressor housing (20).

Abstract: A motor stator (24) has a stator iron core (24a), a stator winding (24b), and a mold member (30) embedding them in an inner portion and having a high coefficient of thermal conductivity. The mold member (30) has a heat insulating layer (32) closely attached to an inner surface thereof surrounding a motor rotor (22) and to an outer surface thereof in an axial direction. Further, an outer sleeve (26) is provided so as to be closely attached to an outer peripheral surface of the mold member (30) and to an inner surface of a bearing housing (16). The outer sleeve (26) forms a liquid tight water cooling jacket (26b) between the outer sleeve and the bearing housing.

Abstract: A motor-driven supercharger is provided with a thrust bearing (30) rotatably supporting a thrust force applied to a turbine shaft (12). The thrust bearing (30) is constituted by a small-diameter disc-shaped thrust collar (32) rotating together with a turbine shaft, and a turbine side thrust bearing (34) and a compressor side thrust bearing (36) which block a movement in an axial direction of the thrust collar. The compressor side thrust bearing (36) has a small-diameter ring portion (37) including a thrust surface which is in contact with the thrust collar and has approximately an equal diameter, and a flange portion (38a) fixed to a housing (16) in the turbine side, and the small-diameter ring portion and the flange portion are arranged at different positions in an axial direction.

Abstract: A motor-driven supercharger is provided with a turbine shaft (12) having a turbine impeller (11) in one end, a compressor impeller (14) rotationally driven by the turbine shaft, a housing surrounding the turbine impeller, the turbine shaft and the compressor impeller, a motor stator (24) fixed within the housing, and a motor rotor (22) rotationally driven by the motor stator. The motor rotor (22) is fixed to an inner diameter side of the compressor impeller (14) in accordance with a fitting.

Abstract: A driver (41) for driving a rotary motor (20) directly connected to a rotating shaft member of a supercharger is mounted on a board (39) together with a control device (51) and a heat sink (39a) and is housed in an engine room. Even when a temperature (ambient temperature) in the engine room detected by a temperature sensor (47b) rises up to an upper limit temperature (upper limit ambient temperature) of the ambient temperature, if a temperature (driver temperature) of a portion of the driver (41) that has a highest temperature detected by a temperature sensor (47a) is yet to rise to an upper limit temperature (upper limit internal temperature) of the driver temperature, the control device (51) causes the rotary motor (20) to continue to drive as the motor while lowering an upper limit of an output current.

Abstract: A motor rotor (22) of the invention is constituted by a motor shaft (30), a permanent magnet (319 surrounding the motor shaft (30) around an axis, a pair of end rings (32, 32) surrounding the motor shaft (30) around the axis and sandwiching the permanent magnet (32) from both sides in an axial direction, and a hollow cylindrical outer sleeve (33) fitted to the permanent magnet (31) and a pair of end rings (32) in accordance with a stationary fit. A longitudinal elastic modulus of the end ring (32) is larger than a longitudinal elastic modulus of the permanent magnet (32). A thickness of the outer sleeve (33) is different in correspondence to a position in the axial direction in such a manner as to uniformize a circumferential stress applied to the outer sleeve (33) fitted to the permanent magnet (32) and a pair of end rings (32) in the axial direction.

Abstract: A supercharger with an electric motor includes, a turbine impeller rotationally driven by an exhaust gas, a compressor impeller rotationally driven by rotation of the turbine impeller, a compressor housing accommodating the compressor impeller, a turbine housing accommodating the turbine impeller, a shaft coupling the turbine impeller and the compressor impeller, a bearing housing rotatably supporting the shaft, an electric motor accommodated in an inside of the bearing housing for assisting rotation of the turbine impeller, and a power supply line extending from an inside to an outside of the bearing housing. The power supply line has one end portion connected to the electric motor, and the other end portion connected to a connector that receives electric power. The connector is installed at a position that is away from a side of the turbine impeller, and is less affected by heat of the exhaust gas.

Abstract: The invention is characterized in that in a motor rotor constituted by a motor shaft (30), a permanent magnet (31) surrounding the motor shaft (30) around an axis, a pair of end rings (32, 32) surrounding the motor shaft (30) around the axis and pinching the permanent magnet (31) from both sides in an axial direction, and a hollow cylindrical outer sleeve (33) surrounding the permanent magnet (31) and a pair of end rings (32, 32) in a fastening state around the axis, one end portion or both end portions of the outer sleeve (33) protrudes in the axial direction than an end surface of the end ring (32). A rotating balance correction is executed by pruning away a part of the protruding portion.

Abstract: In a supercharger (10) with an electric motor in accordance with the invention, an inner side of the center housing (10) is provided with an air introduction path (38) introducing a part of a compressed air within the compressor housing (8) to the electric motor (20), and a cooling structure portion (40) cooling the air flowing through the air introduction path (38). The center housing (14) has a cooling fluid flow path (34) which is formed so as to surround the electric motor (20) and puts a cooling fluid for cooling the electric motor (20) in circulation inside. The cooling structure portion (40) is structured such as to be capable of heat exchanging between the cooling fluid and the air flowing through the air introduction path (38).

Abstract: In a supercharger (10) with an electric motor in accordance with the invention, an inner side of the center housing (10) is provided with an air introduction path (38) introducing a part of a compressed air within the compressor housing (8) to the electric motor (20), and a cooling structure portion (40) cooling the air flowing through the air introduction path (38). The center housing (14) has a cooling fluid flow path (34) which is formed so as to surround the electric motor (20) and puts a cooling fluid for cooling the electric motor (20) in circulation inside. The cooling structure portion (40) is structured such as to be capable of heat exchanging between the cooling fluid and the air flowing through the air introduction path (38).

Abstract: In a supercharger (10) with an electric motor in accordance with the present invention, the electric motor (20) is arranged at a position adjacent to a compressor impeller (6), a center housing (14) has a cooling fluid flow path (34) formed in such a manner as to surround the electric motor (20) and be adjacent to a diffuser portion (25). A first cooling structure portion (38) is formed at a position in the electric motor (20) side in the cooling fluid flow path (34), a second cooling structure portion (39) is formed at a position in the diffuser portion (25) side in the cooling fluid flow path (34). The electric motor (20) is cooled by the first cooling structure portion (38). The diffuser portion (25) is cooled by the second cooling structure portion (39).

Abstract: There are provided with a motor rotor (22) fixed to a turbine shaft (12) and rotating together with the turbine shaft, a motor stator (24) surrounding the motor rotor and fixed within a bearing housing (16), an inverted (26) converting a dc power into an ac power, and an inverter controller (28) controlling a frequency and a voltage of the ac power by the inverter. The inverter and the inverter controller are accommodated in a driver container (29), and are coupled to a compressor housing (20) by an insulating coupling member (30).

Abstract: There are provided with a motor rotor (22) fixed to a turbine shaft (12) and rotating together with the turbine shaft, a motor stator (24) surrounding the motor rotor and fixed within a bearing housing (16), an inverted (26) converting a dc power into an ac power, and an inverter controller (28) controlling a frequency and a voltage of the ac power by the inverter. The inverter and the inverter controller are accommodated in a driver container (29), and are coupled to a compressor housing (20) by an insulating coupling member (30).