Disclosed is a hermetic AC electric motor that includes harmonics shunting such that high frequency harmonics are shunted from the AC electric motor without the use of one or more high frequency filters in the associated motor drive. A related method of operating an AC electric motor includes shunting high frequency harmonics to a fluid passing through the AC electric motor. Also disclosed is a simplified variable speed motor drive system which eliminates the need for a filter for removing high frequency harmonics.

An arrangement for cooling at least one axial end region of a stator in a rotating electrical machine, having: at least one annular chamber which is disposed on the radially outer periphery of at least one portion of the axial end region having at least one radial cooling duct, and which on the radially inner part towards the axial end portion is at least partially open and is communicatingly connected to the radial cooling duct, and which is sealed with respect to the axial end region; and at least one low-pressure line which is communicatingly connected to the annular chamber, and via which the annular chamber is communicatingly connected to a low-pressure chamber in the rotating electrical machine which, relative to a flow of cooling fluid that is created by a shaft-mounted fan on a rotor in the rotating electric machine, is upstream of the shaft-mounted fan.

A hydrogen expander magnetic generator apparatus can include a magnetic generator to recover energy. Embodiments can utilize a permanent magnetic motor (PM) and energy conversion system (ECS) for converting energy from a rotating shaft of a turboexpander. Some embodiments can position magnets on the shaft such that the magnets are protected from exposure to hydrogen to avoid damage to the magnets. Some embodiments can include retrofitting of a pre-existing expander to remove an oil brake and replace it with an embodiment of the PM and ECS.

An electric motor comprising a stator having a stator cavity with an axis extending in a longitudinal direction, said stator cavity having a stator inlet for receiving a fluid and a stator outlet for discharging said fluid, a rotor arranged inside the stator cavity and rotatable around said axis, a tubular sleeve, arranged between the stator and the rotor, coaxial with said axis, and attached to the stator through attachment members. The tubular sleeve is spaced from the stator by a first tubular gap, and from the rotor by a second tubular gap, the first tubular gap extends along the longitudinal direction between a first gap inlet and a first gap outlet, the second tubular gap extends along the longitudinal direction between a second gap inlet and a second gap outlet, the first and second gap inlets are in direct fluid communication with the stator inlet, and the first and second gap outlets are in direct fluid communication with the stator outlet, such that the fluid entering the stator cavity at said stator inlet divides into a first fluid flow and a second fluid flow respectively flowing through the first tubular gap and the second tubular gap and exiting the stator cavity at said stator outlet, the tubular sleeve is made of a thermal insulating material, thereby thermally insulating the first tubular gap from the second tubular gap.

A heat exchange unit (1) includes a heat exchange housing (3) and two heat exchange arrangements (4) located within the heat exchange housing (3). Each heat exchange arrangement (4) includes an outer (5a) and an inner (5b) air-to-air plate heat exchanger, which are connected in series. The heat exchange unit also relates to a totally enclosed electrical machine system with air to air cooling and a method for cooling the electrical machine system.

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.

In a compressor for refrigerant having a suction inlet for refrigerant and a pressure outlet for compressed refrigerant, said compressor comprising a compression unit and an electric motor driving said compression unit, said electric motor being a synchronous reluctance motor having a stator and a rotor, said rotor comprising a plurality of stacked disc elements, each disc element having a plurality of flux barriers configured to give the rotor core an anisotropic magnetic structure and formed as apertures in said disc element, it is provided that said flux barriers are arranged in said rotor core to define channels enabling a flow of refrigerant through said rotor core, said rotor is provided with a first support element acting on a first front side of said rotor core and a second support element acting on a second front side of said rotor core, said support elements being provided with cut-out sections and said cut-out sections being designed to uncover at least 70% of the cross section of apertures defined by said flux barriers in the respective disc element forming the respective front side of said rotor core.

In a compressor for refrigerant having a suction inlet for refrigerant and a pressure outlet for compressed refrigerant, said compressor comprising a compression unit and an electric motor driving said compression unit, said electric motor being a synchronous reluctance motor having a stator and a rotor, said rotor comprising a plurality of stacked disc elements, each disc element having a plurality of flux barriers configured to give the rotor core an anisotropic magnetic structure and formed as apertures in said disc element, it is provided that said flux barriers are arranged in said rotor core to define channels enabling a flow of refrigerant through said rotor core, said rotor is provided with a first support element acting on a first front side of said rotor core and a second support element acting on a second front side of said rotor core, said support elements being provided with cut-out sections and said cut-out sections being designed to uncover at least 70% of the cross section of apertures defined by said flux barriers in the respective disc element forming the respective front side of said rotor core.

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.

The invention relates to an electric machine (2) comprising a stator (2) and a rotor that can rotate relative to the stator (2), the rotor (3) having a plurality of permanent magnets (5), also comprising a rotor cooling device (8) for cooling the rotor (3), wherein the rotor cooling device (8) comprises at least one cooling device (23) for providing a cooling air flow, said rotor cooling device (8) comprises a control device (22) which is designed to control at least one cooling device (23) for adjusting a coolant power provided by the cooling air flow.