Abstract:
An excimer laser apparatus in which deterioration of the laser gas in the laser container can be suppressed, and damage to the magnetic bearings caused by the laser gas can be suppressed, and which can be reduced in size and operated efficiently, and has low power consumption. Each electromagnet (stator) (7-1) of a magnetic bearing (7) for supporting a rotary shaft (4) of a circulation fan 3 includes excitation coils. Each of the coils is arranged as one unit by embedding a coil body in a ceramic or glass type hardened material which is non-magnetic and has corrosion resistance against a laser gas. The excitation coils are attached to magnetic poles. Alternatively, coil wires (108b) of a radial magnetic bearing (108) can be isolated from a corrosive atmosphere by means of a separation wall (124) while projecting portions of cores (108b) extend through the separation wall (124) and are exposed toward a magnetic bearing rotor (108f).
Abstract:
In a rotor having plural permanent magnets secured on a rotary shaft for use in, e.g., an electric motor which is incorporated preferably into a rack-type electric power steering device, a cylindrical cover is fit on the rotary shaft to cover the external surfaces of the plural permanent magnets, and one or both axial end portions of the cylindrical cover are plastically deformed thereby to secure the cylindrical cover onto the rotary shaft. Thus, the cylindrical cover is firmly secured to the rotary shaft and, even when one or more permanent magnets are separated from the rotary shaft or broken, prevents the separated permanent magnets or the broken fragments from scattering within a housing of the motor.
Abstract:
The rotor has a core with an internal space. Permanent magnets are arranged on the core. These permanent magnets are surrounded by an outer cylinder, which is connected flush to closure disks which bear stub shafts. Channels run out from the internal space in the radial direction to the region of the permanent magnets. A resin mass is first introduced into the internal space. The rotor is thereafter heated and run up to centrifuging rotational speed. As a result, the molten resin mass flows through the channels to the region of the permanent magnets and fills up all the cavities present there and also cracks which form in the brittle permanent magnets on running up to speed. The resin mass hardens while the rotor is kept at centrifuging rotational speed. Each surface region of the permanent magnets is thus reliably protected against corrosion.
Abstract:
A gas transfer machine for use as a vacuum pump, for example, has a pump rotor mounted on a rotatable shaft for transferring a gas, and a reluctance-type motor for rotating the rotatable shaft. The reluctance-type motor has a stator, a motor rotor surrounded by the stator, and a shield member isolating the stator from the motor rotor. The motor rotor is directly coupled to the rotatable shaft and has a plurality of magnetic salient poles.
Abstract:
A stator (1) and sleeve (5) are secured to one another by means of nonpositive engagement in the form of a bayonet mount (30). The apparatus is employed in particular in electric motors.
Abstract:
A small generator includes a hydraulic turbine provided in a fluid path rotating with a passage of a fluid in a predetermined flow and a rotator coupled to the hydraulic turbine rotating together with the hydraulic turbine which acts as a rotor portion opposed to a stator portion having multiple layers in a stepping motor including the stator portion, wherein the rotor portion relatively rotates with respect to the stator portion with the passage of the fluid, thereby generating a power.
Abstract:
A motor pump is provided in which the motor rotor is optimally force balanced for enhanced operation. The motor pump includes a pump head for pressurizing a fluid, and an electric motor drives the pump head. High pressure fluid is circulated through the motor air gap. The shaft of the motor rotor is axially movable with respect to the pump head such that the motor rotor is effectively floated in high pressure fluid as the fluid flows through the motor.
Abstract:
The disclosure relates to an electric motor including a support block containing a ball bearing housing, a rotor that projects from this housing, and a stator assembly mounted around said rotor and fastened on said support block, characterized in that an annular seal, preferably of O-ring type, is squeezed between said stator assembly and the periphery of the fixed race of said ball bearing, the pressure of said annular seal preventing axial and rotational movement of said fixed race; the invention also proposes an assembly process for such an electric motor. The invention is notably suitable for sealed rotor motors.
Abstract:
An annular member 51 is fitted to the outer periphery of the stator cores in a rotating electric machine. The rotating electric machine has a cooling passage 29 in an axial direction between a resin molded section 50 and adjacent stator cores 20. The annular member 51 is formed from a material which has a larger coefficient of linear expansion than the magnetic material comprising the stator cores. At low temperatures, stress resulting from the differential between the coefficient of linear expansion of the stator core and the resin molded section is reduced because an inward compressive force is applied to the stator core by the annular member as a result of the difference in the coefficient of linear expansion.
Abstract:
A stator structure is provided with a stator core having a plurality of cooling passages or slots and an annular resin layer formed on an inner peripheral surface of the stator core that defines a rotor receiving opening. The stator core has a plurality of protrusions disposed on the inner peripheral surface of the stator core to control the depth of the annular resin layer formed on the inner peripheral surface of the stator core. The protrusions have radial thicknesses that are substantially equal to the radial thickness of the annular resin layer.