A gas turbine engine includes a fan located at a forward portion of the gas turbine engine. A compressor section and a turbine section are arranged in serial flow order. The compressor section and the turbine section together define a core airflow path. A rotary member is rotatable with at least a portion of the compressor section and with at least a portion of the turbine section. An electrical machine is coupled to the rotary member and is located at least partially inward of the core airflow path in a radial direction. An enclosure at least partially encloses the electrical machine. The enclosure at least partially defines a first cooling airflow path within the enclosure that at least partially defines a first cooling airflow buffer cavity at least partially around the electrical machine. The first cooling airflow path is in communication with a second cooling airflow path located outside the enclosure that at least partially defines a second cooling airflow buffer cavity at least partially around the enclosure. A cooling duct provides pressurized air to the first cooling airflow path such that the air flows along both the first cooling airflow path and the second cooling airflow path providing the first cooling airflow buffer cavity and the second cooling airflow buffer cavity.

A rotor (2) of an electrical machine (60) has a laminated rotor core (4). A fan (18), which is arranged at the end face in the laminated rotor core (4) is provided for cooling purposes. The fan has a fan blade (21) and a supporting element (20) for the fan blade (21), wherein the fan blade (21) extends by way of a first section (31) beyond the supporting element (20) in a first axial direction and extends by way of a second section (33) beyond the supporting element (20) in a second axial direction (34) which is opposite the first axial direction (32).

A rotor (2) of an electrical machine (60) has a laminated rotor core (4). A fan (18), which is arranged at the end face in the laminated rotor core (4) is provided for cooling purposes. The fan has a fan blade (21) and a supporting element (20) for the fan blade (21), wherein the fan blade (21) extends by way of a first section (31) beyond the supporting element (20) in a first axial direction and extends by way of a second section (33) beyond the supporting element (20) in a second axial direction (34) which is opposite the first axial direction (32).

A hybrid gun device composed of two barrels (1,10) that accept energy from combustion of standard propellant (6), one barrel (10) being operative to produce a high intensity electric current to add accelerating energy to a projectile (7) in the second barrel (1) and at least one coil (8) stage to convert energy between electrical and kinetic to cause the projectile (7) to be launched at hypervelocity.

A hybrid gun device composed of two barrels (1,10) that accept energy from combustion of standard propellant (6), one barrel (10) being operative to produce a high intensity electric current to add accelerating energy to a projectile (7) in the second barrel (1) and at least one coil (8) stage to convert energy between electrical and kinetic to cause the projectile (7) to be launched at hypervelocity.

A high performance rotating electrical machine which aims at downsizing, and challenges inevitable technical problems such as deterioration of efficiency η caused by copper loss and temperature rise inside the rotating electrical machine due to heat generation induced by eddy current generated in magnetic body.

A stator assembly is provided including (a) an inner frame structure having an annular shape with an inner circumferential edge and an outer circumferential edge, wherein the inner frame structure is formed around a center axis corresponding to an axial direction of the electric generator; and (b) an outer frame structure, which surrounds the inner frame structure and which, starting from the outer circumferential edge, includes two inclined annular walls which, along a radial direction, spread apart from each other such that in between a first inclined annular wall and the second inclined annular wall there is formed an accommodation space. Preferably, the inner frame structure and the outer frame structure are made from a single piece.

A drive engine arrangement for an elevator system includes a drive engine for driving suspension traction media for displacing an elevator car, a fan for generating a fluid flow for cooling the drive engine and a fluid flow sensor. The fluid flow sensor senses the fluid flow generated by the fan. Accordingly, using the fluid flow sensor, it can be determined whether or not the fan is currently operating. By e.g. comparing the fan's behavior with previous operation patterns and/or by additionally measuring a temperature of the drive engine with a temperature sensor, it can be monitored whether the fan is operating correctly or whether e.g. cooling requirements may be compromised due to a malfunction of the fan. Such monitoring can be performed remotely and/or automatically.

A drive engine arrangement for an elevator system includes a drive engine for driving suspension traction media for displacing an elevator car, a fan for generating a fluid flow for cooling the drive engine and a fluid flow sensor. The fluid flow sensor senses the fluid flow generated by the fan. Accordingly, using the fluid flow sensor, it can be determined whether or not the fan is currently operating. By e.g. comparing the fan's behavior with previous operation patterns and/or by additionally measuring a temperature of the drive engine with a temperature sensor, it can be monitored whether the fan is operating correctly or whether e.g. cooling requirements may be compromised due to a malfunction of the fan. Such monitoring can be performed remotely and/or automatically.

A power tool is provided including a tool housing including a motor housing and a handle portion; a battery receptacle disposed at an end of the handle portion opposite the motor housing, the battery receptacle being configured to receive a battery pack having a maximum voltage of at least 60 V; and a brushless DC (BLDC) motor including an electronically-commutated stator assembly and a rotor assembly magnetically interacting with the rotor assembly to rotate with respect to the stator assembly, the stator assembly comprising a stator lamination stack sized to be received within the motor housing having a circumference of approximately 140 to approximately 190 mm. The motor produces a maximum power output of at least 1600 watts for driving an output shaft at a maximum torque of at least 30 inch-pounds and a maximum speed of at least 8000 rotations-per-minute.