Abstract: An electric supercharger that can reduce vibration amplitude in an end of a shaft due to rotational vibration is provided. An electric supercharger 101 comprises: an impeller 40 for supercharging a fluid by rotation; an impeller chamber 15 for accommodating the impeller 40; a motor 30 for driving the impeller 40 to rotate; and a motor chamber 18 for accommodating the motor 30. An opening 28 is provided between the impeller chamber 15 and the motor chamber 18 wherein the fluid is able to pass therethrough. Seal structures 50, 51, 52 are provided for separating the motor chamber 18 from the exterior at portions other than the opening 28.

Abstract: An electric supercharger includes a housing, a rotary shaft rotatably supported in the housing via a rolling bearing, an impeller, and an electric motor. The electric motor including a cylindrical stator around which a coil is wound. The stator having a stator core and coil ends. The rolling bearing has an inner ring, an outer ring, and a rolling element. The housing has an oil supply portion. The oil supply portion has attached thereto an oil supply member. The oil supply member has a supply passage and an injection hole. The housing has therethrough oil supply holes communicating with the oil supply portion and disposed so as to overlap with the coil ends.

Abstract: An electric supercharger includes a housing, a rotary shaft, an impeller, and an electric motor. The housing includes a peripheral wall that has a cylindrical shape. The electric motor includes a stator in which a coil is wound. The stator includes a stator core having a cylindrical shape, and a first coil end and a second coil end. A plurality of first oil supply holes are formed in the peripheral wall in a state where openings of the first oil supply holes on a side of the first coil end are arranged side by side in a circumferential direction of the rotary shaft. A plurality of second oil supply holes are formed in the peripheral wall in a state where openings of the second oil supply holes on a side of the second coil end are arranged side by side in the circumferential direction of the rotary shaft.

Abstract: An electric supercharger includes an electric motor, a compressor wheel rotated by the electric motor, and a compressor housing. The compressor housing includes a first passage through which air is introduced, an introducing port connecting to an EGR device, a second passage through which at least one of air and EGR gas is flowed, a bypass passage through which at least one of air and EGR gas is flowed, and a bypass valve to open and close the bypass passage. When the bypass valve is opened, air introduced from the first passage and EGR gas introduced from the introducing port are flowed through the bypass passage to the internal combustion engine. When the bypass valve is closed, air introduced from the first passage and EGR gas introduced from the introducing port are compressed in the compressor wheel and flowed through the second passage to the internal combustion engine.

Abstract: An electric supercharger includes a housing, a rotary shaft rotatably supported in the housing via a rolling bearing, an impeller, and an electric motor. The electric motor including a cylindrical stator around which a coil is wound. The stator having a stator core and coil ends. The rolling bearing has an inner ring, an outer ring, and a rolling element. The housing has an oil supply portion. The oil supply portion has attached thereto an oil supply member. The oil supply member has a supply passage and an injection hole. The housing has therethrough oil supply holes communicating with the oil supply portion and disposed so as to overlap with the coil ends.

Abstract: An electric supercharger includes a rotary shaft, a motor, a motor housing, a sealing plate, an impeller, a rolling bearing, and an oil injection portion. The rotary shaft extends in an axial direction thereof. The motor rotationally drives the rotary shaft. The motor housing accommodates the motor and has an opening. The sealing plate seals the opening. The impeller is fixed to the rotary shaft. The rolling bearing is disposed in the sealing plate or adjacent thereto. The oil injection portion injects lubrication oil to the rolling bearing. In the sealing plate, an oil discharge space is formed adjacent to the rolling bearing and a deflector portion protruded radially inward is formed over at least in part in a circumferential direction of the rotary shaft.

Abstract: A control system for an internal combustion engine includes an electric supercharger that includes a compressor wheel that is configured to be rotated by an electric motor. The control system includes a bypass passage, a bypass valve, and an exhaust gas recirculation passage. The control device is configured to control the electric supercharger and the bypass valve based on an operation condition of the internal combustion engine. The control device is configured to cause a stepping operation of the electric supercharger in which acceleration and stopping of the compressor wheel are repeated within a predetermined cleaning time after operation of the internal combustion engine is stopped.

Abstract: An electric turbo-machine includes a housing, a rotating shaft rotatably supported by the housing through a rolling bearing, an impeller, and an electric motor. The housing has an oil supply section to which lubricating oil is supplied. A tubular oil supply member is mounted to the oil supply section. The oil supply member has a supply passage extending within the oil supply member in the axial direction of the oil supply member and in communication at a first end of the oil supply member with the oil supply section and an ejection hole in communication with the supply passage and configured so as to eject lubricating oil toward a portion between the inner ring and outer ring of the rolling bearing.

Abstract: There is provided an electric supercharger having a compressor including a compressor impeller, a motor housing, an electric motor rotationally driving the compressor, and a first bearing and a second bearing provided to support a shaft and a rotor in the motor housing. The first bearing is located on the compressor side of the rotor and the second bearing is located on the other side of the rotor. The motor housing includes a thermal conductive passage through which heat generated by a coil wound around a stator is transmitted to the first and second bearings. The thermal conductive passage between the coil and the first bearing is formed with a reduced thickness portion in such a way that thickness of the thermal conductive passage is reduced in a direction that is perpendicular to a direction in which the heat is transmitted through the thermal conductive passage.

Abstract: A control system for an internal combustion engine includes an electric supercharger that includes a compressor wheel that is configured to be rotated by an electric motor. The control system includes a bypass passage, a bypass valve, and an exhaust gas recirculation passage. The control device is configured to control the electric supercharger and the bypass valve based on an operation condition of the internal combustion engine. The control device is configured to cause a stepping operation of the electric supercharger in which acceleration and stopping of the compressor wheel are repeated within a predetermined cleaning time after operation of the internal combustion engine is stopped.

Abstract: An electric supercharger includes an electric motor, a compressor wheel rotated by the electric motor, and a compressor housing. The compressor housing includes a first passage through which air is introduced, an introducing port connecting to an EGR device, a second passage through which at least one of air and EGR gas is flowed, a bypass passage through which at least one of air and EGR gas is flowed, and a bypass valve to open and close the bypass passage. When the bypass valve is opened, air introduced from the first passage and EGR gas introduced from the introducing port are flowed through the bypass passage to the internal combustion engine. When the bypass valve is closed, air introduced from the first passage and EGR gas introduced from the introducing port are compressed in the compressor wheel and flowed through the second passage to the internal combustion engine.

Abstract: A sensorless electric motor control device is provided that completes a phase detection of a rotor before an activation signal is received, so as to shorten a time period from when the activation signal is received to when the rotor reaches a target number of rotations. The control device for a sensorless electric motor 10 includes an inverter 11 that drives the electric motor 10 and a first processor 18 that serves as a phase detection unit that causes the inverter 11 to perform a phase detection before the inverter 11 receives an activation signal that activates the electric motor 10, wherein the phase detection aligns a magnetic pole of a rotor of the electric motor 10 with a predetermined position with respect to a stator.

Abstract: An electric supercharger includes an electric motor, a motor housing, a drive circuit, a circuit housing, and a compressing portion. The circuit housing includes an accommodating wall having a shape projecting from an outer surface of the motor housing, and a bottom located at a distal end in the projecting direction of the accommodating wall. The circuit housing together with the motor housing, hermetically confines the drive circuit. The bottom includes a heat release portion that faces the outer side of the circuit housing. The drive circuit is thermally coupled to an inner surface of the heat release portion that faces the inner side of circuit housing.

Abstract: An electric supercharger having an impeller that rotates in order to supercharge a fluid includes: a housing; a shaft supported to be capable of rotating relative to the housing via a first bearing and a second bearing; a first bearing sleeve and a second bearing sleeve fixed to the housing in order to support the first bearing and the second bearing, respectively; and a first rubber sheet and a second rubber sheet provided between the housing and the first bearing sleeve and the second bearing sleeve, respectively, in an axial direction X. With this electric supercharger configured in the abovementioned manner, elastic members can be incorporated easily between a housing and respective bearing sleeves, and an offset load can be prevented from acting on a pair of bearings supported by the respective bearing sleeves.

Abstract: There is provided an electric supercharger having a compressor including a compressor impeller, a motor housing, an electric motor rotationally driving the compressor, and a first bearing and a second bearing provided to support a shaft and a rotor in the motor housing. The first bearing is located on the compressor side of the rotor and the second bearing is located on the other side of the rotor. The motor housing includes a thermal conductive passage through which heat generated by a coil wound around a stator is transmitted to the first and second bearings. The thermal conductive passage between the coil and the first bearing is formed with a reduced thickness portion in such a way that thickness of the thermal conductive passage is reduced in a direction that is perpendicular to a direction in which the heat is transmitted through the thermal conductive passage.

Abstract: A sensorless electric motor control device is provided that completes a phase detection of a rotor before an activation signal is received, so as to shorten a time period from when the activation signal is received to when the rotor reaches a target number of rotations. The control device for a sensorless electric motor 10 includes an inverter 11 that drives the electric motor 10 and a first processor 18 that serves as a phase detection unit that causes the inverter 11 to perform a phase detection before the inverter 11 receives an activation signal that activates the electric motor 10, wherein the phase detection aligns a magnetic pole of a rotor of the electric motor 10 with a predetermined position with respect to a stator.

Abstract: An electric supercharger that can reduce vibration amplitude in an end of a shaft due to rotational vibration is provided. An electric supercharger 101 comprises: an impeller 40 for supercharging a fluid by rotation; an impeller chamber 15 for accommodating the impeller 40; a motor 30 for driving the impeller 40 to rotate; and a motor chamber 18 for accommodating the motor 30. An opening 28 is provided between the impeller chamber 15 and the motor chamber 18 wherein the fluid is able to pass therethrough. Seal structures 50, 51, 52 are provided for separating the motor chamber 18 from the exterior at portions other than the opening 28.

Abstract: An electric supercharger wherein the assemblability of a bearing holding structure is improved is provided. An electric motor 30 of an electric supercharger 101 has a shaft 22. A second bearing 24 supports the shaft 22 rotatably. The second bearing 24 comprises an outer ring 24a and an inner ring 24b rotatable with respect to each other. A second bearing sleeve 26 supports the outer ring 24a as a fixed ring. A key ring 51 positions the outer ring 24a with respect to the second bearing sleeve 26. A preloading spring 52 energizes the key ring 51 toward the outer ring 24a or the second bearing sleeve 26.

Abstract: An electric motor includes a housing, a rotary shaft supported rotatably by the housing, a rotor fixed to the rotary shaft, and a stator fixed to the housing and provided opposite the rotor on a radial direction outer side of the rotor, wherein the stator includes a stator core formed by laminating a plurality of steel plates, the stator core is fixed to a stator attachment surface provided on an inner peripheral surface of the housing, and an inner diameter expansion region is provided adjacent to the stator attachment surface on the inner peripheral surface of the housing in a position corresponding to an end part of the stator core, the inner diameter expansion region having a larger diameter than the stator attachment surface so as not to contact the stator core. As a result, deformation of the laminated steel plates forming the stator core can be prevented by means of a simple structure.