摘要:
This invention relates to a switched reluctance rotator according to which a rotor can be rotated at a high speed without generating electromagnetic vibration at a rotating shaft and in which a current for generating of torque and a current for generating a radial force are passed through windings on the protruding poles of the stator or a winding for generating torque, and a winding for generating a radial force are wound on the protruding poles of the stator.
摘要:
A flywheel for storing inertial energy is integral with a rotor which is rotatable around a stator. The stator has main windings that provide a number of poles for rotating the rotor and auxiliary control windings that provide a number of poles different from the number of poles provided by the main windings. When currents are supplied to the main windings, the rotor and hence the flywheel are rotated. When control currents are supplied to the auxiliary control windings, radial forces acting on the rotors are generated thereby to support the rotor out of contact with the stator.
摘要:
A magnetic bearing device for freely supporting a rotating loaded shaft (7), said device comprising:
(a) a rotor (8) mounted on said shaft (7) via an iron core (9), wherein a plurality of regularly spaced permanent magnets (PM) (10a-10d) are attached to the exterior periphéry of the rotor (8); and (b) a stator (5) surrounding said plurality of permanent magnets (PM) (10a-10d) with an airgap therebetween, wherein a plurality of regularly spaced alternating current electomagnets (6) are disposed on the inner circumferential periphery thereof; wherein said electromagnets (6) are energized successively while said loaded shaft (7) is rotating, sa as to generate a rotating magnetic field, moving along the inner circumference of the stator (5), having a number of poles which is defined by the number of poles on said rotor (8), thereby forming a magnetic bearing to freely support said rotating load shaft (7).
摘要:
There is provided an electric machine comprising a stator, a rotor configured to rotate relative to the stator, the stator having a phase arrangement. The phase arrangement includes a number of legs connected in parallel at a first primary junction and a second primary junction. The number of legs is an integer greater than two. Each leg includes a plurality of coils connected in series through a respective intermediate junction, with each coil comprising a number of turns. Each leg is connected to at least one other leg of the legs by a branch at the respective intermediate junctions such that the phase arrangement is in the form a bridge circuit. The phase arrangement is configured to conduct, through each leg, a motor current through the respective in series coils between the first primary junction and the second primary junction. The phase arrangement is configured to permit an alignment current to flow between the first primary junction and the second primary junction along an alignment current path which passes through at least one coil of two different legs of the number of legs via a respective branch. The electric machine is configured so that the motor currents cause a torque to be applied to the rotor for rotation relative to the stator, and the alignment current causes a translational force to be applied to the rotor.
摘要:
It is described a method for controlling a generator (115) having a rotor (104) with plural magnets (106) and at least a first stator winding (163) and a second stator winding (165), electrically separate from the first stator winding, the rotor being adapted to rotate, around a rotation axis (160) perpendicular to a radial direction (164), relative to the stator windings, the method comprising: allowing flow of a first electric current (154) through the first stator winding (163), thereby generating a first radial force (167) having a first magnitude and acting between the first stator winding (163) and the rotor (104); allowing flow of a second electric current (156) through the second stator winding (165), thereby generating a second radial force (169) having a second magnitude and acting between the second stator winding (165) and the rotor (104), wherein the first magnitude is different from the second magnitude resulting in a net generator generated radial force (170) generated by the first stator winding and the second stator winding at the rotor.
摘要:
The invention provides an electric machine comprising a radial bearing (10,11) for supporting a shaft of said electric machine, comprising an inductor (40) having an inductor axle (30), generating a magnetic field having p pole pairs, p being equal to or larger than 1; a motor/generator armature winding (170) having turns (100) arranged around an armature axis (35), magnetically coupled to said magnetic field, and connected to a source in such a manner that a torque is produced when a current is fed into said motor/generator armature winding (170) when said electric machine is a motor or connected to a load in such a manner that a current is produced in said load when said inductor is rotated, when said electric machine is a generator; a bearing armature winding (70) having turns (100) disposed around said armature axis (35), magnetically coupled to said magnetic field, and connected in a closed circuit in such a manner that the net flux variation intercepted by said armature winding (70) when said inductor (40) and said armature winding (70) are in rotation with respect to each other is zero when said inductor axle (30) and said armature axis (35) coincide and is different from zero when said inductor axle (30) and axis (35) do not coincide; a gap (50) between said inductor (40) and said winding (70). Said bearing armature winding (70) comprises p-1 or p+1 pole pairs. In a preferred embodiment, the two windings are combined in one multifunction winding.
摘要:
A magnetically-levitated centrifugal pump, in which permanent magnets are not used for disposable sections, is provided with a pump head section and a pump section. The pump section comprises a stator, a torque transmission disc, a motor, a displacement sensor, and a pump housing. The stator has longer depth than protrusion length of a rotor accommodation section in which permanent magnets are not used, is equipped with a rotor insertion section, in which the rotor accommodation section is disposed so as to be able to be inserted and removed, on the side of one end section, and disposes three or more than three electromagnets for magnetic bearings, which magnetically couple with the rotor, at equal intervals. The torque transmission disc, which is disposed inside the rotor insertion section and which magnetically couples with the rotor, is formed by bonding ring components, which are made from magnetic material and are provided with protrusions at positions opposite protrusions on the rotor, between plural ring-shaped permanent magnets, which are magnetized in the thickness direction thereof, such that like-poles face each other, and then by placing another ring component on top of the uppermost ring-shaped permanent magnet. The motor rotationally drives the torque transmission disc. The displacement sensor measures radial displacement of the rotor.
摘要:
An excimer laser apparatus comprises a container (1) sealing a laser gas including a halogen gas therein, a pair of discharge electrodes (2) disposed in the container (1) for inducing an electric discharge capable of oscillating a laser light, and a circulating fan (3) with a shaft (4) for producing a high-speed laser gas stream between a pair of the discharge electrodes. Both ends of the shaft (4) are rotatably supported by rotor-stator mechanisms, or one end of the shaft is rotatably supported by a rotor-stator mechanism, and the other end of the shaft is supported by a magnetic bearing. The rotor-stator mechanism comprises a rotor (11d,12d) attached to the shaft (4) of the circulating fan (3), a stator (11b,12b) provided at a position opposed to the rotor, an electric motor winding (14) provided in the stator for applying torque to the rotor, and a position control winding (15) provided in the stator for producing a magnetic force to levitate and support the rotor.
摘要:
In the particular embodiments described in the specification a permanent magnet synchronous machine includes a stator with a plurality of stator coils and a rotor within the stator having a plurality of permanent magnets disposed around its periphery, and position detectors for detecting the horizontal. vertical and axial positions of the rotor within the stator. A magnetic bearing control arrangement generates control signals based on deviations of the rotor position from a desired position and supplies corrective signals to the stator coils and a motor control arrangement detects the angular position and speed of the rotor within the stator and supplies signals to the stator coils simultaneously with the magnetic bearing control signals to control the angular position and rotational speed of the rotor.