Rotor of electric machine |
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IPC classes for russian patent Rotor of electric machine (RU 2516440):
 Rotor for high-revolution electrical machine / 2505908
Rotor for a high-revolution electrical machine has a shaft, a magnetic system with permanent magnets and a cylindrical nonmagnetic ring encircling their outer surface and which prevents centrifugal movement of the magnetic system. The shaft has a regular polygon-shaped cross-section at the vertices of which there are rectangular grooves. The walls of the grooves are parallel to their planes of symmetry which pass through the axis of rotation of the rotor. The nonmagnetic ring has protrusions on its inner cylindrical surface which are situated in the grooves of the shaft without clearance. When the structure is operating at high rotational frequencies, movements of the ring and magnets are aligned by lateral faces of the protrusions.
 Power generation system / 2480887
Voltage control is carried out in particular due to mechanical displacement of parts of a rotor magnetic system relative to each other, control of which is carried out, for instance, along a feedback circuit, besides, the generator shaft is equipped with inner and outer bushings, freely moving relative to the shaft, at the same time the specified bushings are rigidly connected with one or several keys, and a part of the rotor magnetic system is rigidly connected with the outer bushing, while the second part of the rotor magnetic system is rigidly fixed on the shaft. Mutual displacement of magnetic system parts is carried out due to radial-reciprocal movement of bushings by means of axial action of an electromagnet connected with an inner bushing via a support-radial bearing.
 Synchronous non-contact generator / 2472274
Synchronous non-contact generator comprises a rotor (1) with permanent magnets and an anchor (2) with an m-phase working (3) and an m-phase additional (5) windings connected according to the delta circuit. Identical phase areas of working and additional windings are combined, and their turns are arranged in common slots of the anchor. The generator (1) rotor is rotated by the shaft of the primary motor, proportionally to speed of which frequency and voltage vary at the generator's output. Dependence of output voltage of the generator at the output of the working winding reduces as a result of magnetising action of anchor reaction flow generated by an additional winding (4). The additional factor that stabilises output voltage of the working winding (3) is also an electromotive force of mutual induction, generated by an additional winding (4) with increased speed of primary motor or load current. Therefore, the additional winding provides for internal negative feedback by generator voltage.
 Rotor of synchronous electric machine and synchronous electric machine comprising such rotor / 2444106
Rotor of a synchronous electric machine comprises a core, permanent magnets fixed on the core and forming a magnetic system of the rotor, and also a start-up winding made in the form of a hollow cylinder, which is made of current-conducting material and is pressed onto the magnetic system of the rotor. At the same time according to the invention the current-conducting material, from which the hollow cylinder is made, is magnetic and has specific electric resistance within (0.6-1.1) 10-7 Ohm and relative magnetic permeability within 10-50.
 Alternate current generator with combined excitation / 2439770
Suggested alternate current generator consists of stator including two laminated stacks with polyphase winding pressed-in into massive magnet core, stationery field between laminated generator stacks and rotor with shortened poles. At that poles are made as permanent magnets with radial magnetisation and shortening in axial direction; shortening for poles of different polarity is made at opposite sides and insert made of soft magnetic material is added at point of shortening; number of rotor poles differs from number of stator teeth per one or two; stator winding consists of coils and each coil is slipped on two teeth of both laminated stacks located opposite each other.
 Noncontact electric motor / 2424611
Noncontact electric motor includes hollow cylindrical nonmagnetic slotless stator with winding, which is arranged between parts of composite rotor. Outer part of rotor is made in the form of ferromagnetic shell, and inner part is made in the form of cylindrical constant magnet fixed on shaft in bearings. The latter are arranged in support sleeves of stator ends, which can be made from heat-resistant dielectric material.
 Electric motor of mining mill of direct drive system / 2417505
Electric motor has a circular segmented stator core, laminated from sheets of electric steel, in a stand, with three-phase winding laid into core slots, inside which there is a rotor installed in the form of the mill body, outside of which in grooves there are permanent magnets arranged from alloy Nd-Fe-B (neodymium - iron - boron), and between them there are electroconductive rods of short-circuited winding, and steel armoured boards laid in shock absorbers are fixed inside to the body with screws.
 Method for manufacturing of high-speed electric machine rotor / 2400907
Plates are cut of sheets made of non-magnetic material of austenite-martensite grade, which is able to change in process of cold deformation from non-magnet phase to magnet phase, and when further heated - back to non-magnet phase. Such material may be alloy on the basis of austenite-martensite corrosion-resistant steel. At first stock non-magnet sheets are exposed to at least 65% cold pressing, shaping material change over to magnetic phase with magnetic permeability µ>100 Gs/E. Afterwards, with the help of heating by laser radiation up to 1000 - 1200°C, reverse conversion of material phase is carried out in local sections, corresponding to location of non-magnet zones of rotor plates with magnetic permeability µ=1 Gs/E. Previously prior to heating, absorbing coating is applied onto sections of surfaces that correspond to arrangement of non-magnet zones, and the coating increases thermal effect at least 2.5 times. For reliable preservation of material magnet phase resistance it is optimal that its temperature is at least 500°C below temperature of converted local sections heating. After heating and further natural cooling on air, coating is removed, rotor plates are cut as per program and are fixed to each other in axial direction into packet, which is installed on rotor shaft. Heating with laser radiation is carried out by means of sheet surface scanning by focused or non-focused laser beam. Gradient material has high mechanical characteristics (yield point on both phases is at least 80 kG/mm2) while magnetic permeability of magnetic material is at least 100 Gs/E, and non-magnetic - 1 Gs/E.
 Self-tuning generator with permanent magnets / 2399143
AC generator comprises the following components: permanent magnet facility to create rotary magnetic field, anchor facility comprising at least two excitation winding adjacent to permanent magnetic field and arranged within the limits of rotary magnetic field, primary winding of anchor facility connected to load, and also secondary winding displaced relative to primary winding on anchor and connected to capacitance load.
 Rotor of high-speed electric machine (versions) / 2382472
Invention is related to the field of electric engineering and electric machine building and may be used in design of synchronous high-speed motors and generators. According to this invention, rotor comprises shaft (1) with alternating pole magnetic system attached on it, which is arranged in the form of identical solid circular plates tightened to each other in axial direction. In plates there are windows arranged, which are intended for placement of permanent magnets (2). According to the first version of realisation, permanent magnets are magnetised in tangential direction, and according to the second version - in radial one. In each of circular plates there are magnetic and nonmagnetic zones. According to the first version, one of nonmagnetic zones represents ring (3) that embraces shaft, and other circular fragments (4) arranged along external diametre of plate, which limit space of windows from outside. According to the second version, nonmagnetic zones are arranged between end surfaces of neighboring windows and between their geometric extensions that achieve external diametre of plate surface. Difference (by 10-20%) in dimensions of circular fragments arcs and widths of windows for placement of permanent magnets (according to the first version), and also heights of end surfaces of windows and their separating partitions (according to the second version) makes it possible to increase mechanical strength of structure in corners of windows, where maximum mechanical tensions occur from action of centrifugal forces. Solid plates are made of material, which may vary its magnetic properties, for instance, from magnetic austenite steel, which after special thermal or mechanical processing acquires properties of nonmagnetic material.
 Single-phase alternating current motor / 2516413
Invention relates to electric engineering, particularly to electric machines and covers design features of a single-phase alternating current motor. The suggested single-phase alternating current motor contains a stator with teeth-forming slots for the primary winding and slots for an auxiliary winding. The primary winding can be connected to the alternating current supply source in order to generate the main magnetic field with the main magnetic axis, the auxiliary winding can be connected to the power supply source through an operating capacitor to generate an auxiliary magnet field with an auxiliary magnetic axis, at that the above main and auxiliary axes set the rotating vector by means of vector summation and this vector represents the resultant magnetic field with permanent magnetic induction at operation of the motor at the rated load. Herewith according to the invention the teeth group located at the auxiliary magnet axis has a higher magnetic conductivity in comparison with other teeth, at that the least tooth of all teeth forming slots for the primary winding is bigger that the biggest tooth of all teeth forming slots for the auxiliary winding.
 Electromagnetic device with reversible generator and motor operation / 2516373
Invention relates to electrical engineering. The electromagnetic device has a stator and a rotor rotating between facing surfaces of the stator and bearing a plurality of magnets distributed at regular intervals along its periphery. The magnets are arranged such that they form a sequence of alternately opposite poles on the surfaces of the rotor directed towards the stator, and the stator comprises two sets of independently supported magnetic yokes located at both sides of the rotor in front of the magnets. The magnetic yokes have two axially oriented arms, the end surfaces of which, when the rotor is in a fixed state, at least partly face a pair of successive magnets on a same surface of the rotor.
 Stator of rotating electric machine excited by permanent magnets / 2516367
Stator has a variety of segments located close to each other in the circumferential direction. According to the invention the above segments have teeth and slots passing in the longitudinal direction of the stator, at that the neighbouring segments touch each other at the segment boundary and teeth of the neighbouring segments are located so that at the segment boundary a tooth of one segment touches the tooth of the neighbouring segment, herewith the total width of the teeth touching each other at the respective boundary is bigger than the total width of the majority of teeth which are not placed at the segment boundaries or all teeth which are not placed at the segment boundaries directly, at that the minority of teeth not placed directly at the boundary of the specified segments has the same width, which is bigger than the total width of the majority of teeth which are not located directly at the segment border.
 Synchronous micromotor with electromagnetic unipolar excitation / 2516286
Invention refers to the field of electric engineering, in particular, to electric machines, and relates to manufacture of synchronous micromotor with unipolar excitation. A synchronous micromotor with unipolar excitation contains a stator with a standard core with a three-phase power winding that creates a rotary magnetic field of the stator and a direct-current excitation winding that creates an excitation flux, as well as a cylindrical solid rotor of iron-copper alloy divided by a non-magnet conductive layer into two magnet isolated parts - two cores of the rotor. According to the invention, at that in order to increase reliability of the synchronous motor operation contactless electromagnetic unipolar excitation is carried out when two cores of the rotor form two permanent magnet poles with invariable different polarity, the north N and the south S ones, at their interaction with the rotary magnetic field of the stator the synchronising torque is created and availability of solid cores at the rotor ensures asynchronous start without a starting winding.
 Permanent magnet machine / 2516270
Permanent magnet machine contains a fixed stator and a movable rotor made of non-magnet material, in the stator frame there are U-shaped imbricated cores with windings, the rotor contains operating components made as the permanent magnets placed in the openings in the form of slots with size l and l1, at that the number of slots m is equal to the number of the permanent magnets. At that the stator frame of the permanent magnet machine is made as a hollow cylinder with at least 3 groups of U-shaped imbricated cores with windings placed at its inner surface. Each group contains at least 3 U-shaped imbricated cores with windings interconnected in series and shifted in regard to each other per the distance L. The rotor is placed inside the stator and consists of a hollow cylinder with the permanent magnets placed in its slots and shifted in regard to each other per the angle of α=120°, poles of the permanent magnets protrude the limits of the hollow cylinder per a value Δ: Δ=d-l', where Δ is a value of the magnet poles protrusion outside the limits of the hollow cylinder; d is a circle diameter defined by the inner diameter of the stator and sizes of the magnet core; l' is a value of the air gap between the magnet core and the magnet.
 Single-phase asynchronous motor / 2516250
Invention is related to the field of electric engineering, namely to single-phase asynchronous motors with a starting winding, and can be used for electric tools and household appliances, for example in refrigerant compressors subject to essential shaft load at start-up and common operating conditions at the mains low voltage. In a single-phase asynchronous motor containing a rotor and a stator with slots with placed main and auxiliary windings with magnet axes shift in regard to each other per a half of polar pitch according to the invention in the area of stator slots located in the areas of the main winding magnet axes there are through nonmagnetic gaps filled with air or nonmagnetic inserts.
 Stator of rotating electric machine with constant excitation / 2516246
In the middle of the first coil group (10a) there is a middle tooth (8a), which has the first MB width of the middle tooth. A stator (5) has the second group (10b) of coils. The first and second groups of coils are placed in the circumferential direction (U), directly in sequence one after another. Between the first and second groups of coils there is the first edge tooth (9), which has the first RB width of the edge tooth. In essence the first RB width of the edge tooth is equal to RB=a·ZB, and the first MB width of the middle tooth is equal to MB=(2-a)·ZB. The coefficient a is bigger than 0 and less than 1.
 Electric machine with axial off-centre coolant flow and respective method / 2516234
Invention is related to the field of electric machines. The electric machine has at least one radial cooling groove (16) and axial cooling channels. The first cooling channels (18) with their central axis pass at another radial height in regard to a rotor axis (11) in comparison with the second cooling channels (19). In at least one radial cooling groove (16) there is a spacer (29) by which the first coolant flow (28) from the first cooling channels (18) can be directed to one of the second cooling channels (19). Due to that the second partial packet (T2) in the flow direction can be supplied with colder air when it passes through the first partial packet (T1) in the cold area, for example, close to the shaft.
 Permanent magnet, method of its production, rotor and motor with internal permanent magnet (ipm) / 2516005
Permanent magnet production process comprises the steps that follow. a) Fabrication of permanent magnet (1). b) Cracking of permanent magnet (1) to get two or more separate parts (13). c) Recovery of permanent magnet (1) by jointing rupture surfaces of separate adjacent parts (13) together.
 Magnetoelectric engine / 2515999
In a magnetoelectric engine rotor contains a disc fixed at a shaft whereat a ring-shaped line of permanent magnets with alternating polarity is mounted. A stator contains two parallel plates and the stator windings are placed between them. The stator plates are equipped with cores of electric steel, at which the stator windings are placed. The cores are made as two rings and there are protrusions at their surfaces faced to each other. Width of the protrusion B is equal to half of the permanent magnet C width. Protrusions of one core are off-centred in regard to protrusions of the other core to the half of the permanent magnet C width. The rotor disc is placed between the cores of the stator windings.
 Rotor magnetic system / 2244370
Rotor magnetic system has more than two magnetically permeable steel laminations with pole horns formed by prismatic tangentially magnetized N-S permanent magnets placed inside laminated stack; inner and outer diameters of laminations are uninterrupted and rectangular prismatic magnets are installed inside them so that distance over outer arc between external planes of two adjacent magnets of unlike-polarity poles is shorter than that over internal arc between same planes; magnets do not contact one another and have at least one projection on inner diameter for coupling with rotor shaft.
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FIELD: electricity. SUBSTANCE: rotor of the electric machine contains a shaft, a magnet core made of equally alternating magnet and non-magnet circular plates, permanent magnets with pole tips and a cylindrical non-magnet cage covering them from the side of the external surface. The permanent magnets with pole tips are installed in windows of the above cage. At that according to the invention the permanent magnets are made so that the radius centre of the external cylindrical surface of each magnet is shifted along the longitudinal magnet axis towards the external surface of the non-magnet cage forming a smooth increase in the cage cross-section above the magnet and pole tip from the magnet longitudinal axis towards its lateral sides. Mechanical stress occurring in such design of the rotor is distributed evenly across the cross-section of the above non-magnet cage over each permanent magnet with pole tip from the magnet longitudinal axis towards its lateral sides during operation of the electric machine. EFFECT: improving reliability and power of the electric machine containing the claimed rotor due to possible increase in rotation frequency. 1 dwg
The invention relates to electrical engineering, namely to the field of electrical engineering and can be used in the design of electrical machines for various purposes. Known for a number of prefabricated rotors of electric machines with permanent magnets. These constructs contain the shaft, the magnetic system of permanent magnets, the ferromagnetic parts of the magnetic circuit for the magnetic flux (if necessary), start-up and the damper winding (if necessary) [Booth D.A. Contactless electrical machines. M: "High school", 1990, p.77, RIS, 2.22]. A known design of rotors with permanent magnets provide high power characteristics of electric machines, especially when using rare earth permanent magnets, and have sufficient reliability at low speeds. However, for operation at high speeds in most designs of rotors requires the use of fasteners of non-magnetic, as a rule, the material that protects the rotor from destruction by centrifugal forces during the rotation. Closest to the invention the device is the rotor [a Rotor of the electric machine. Patent No. 2211517 NC 1/27 NC 1/28 NC 21/14 from 27.08.03,], which contains a magnetic core, permanent magnets with pole pieces and covering ihpo the outer surface of the ferrule. The clip, made in the form of concentric rings connected by a jumper, holding permanent magnets with pole pieces from radial movement by centrifugal force during rotation of the rotor. This rotor design is simple, adaptable and reliable at higher speeds, but at high speeds the structural reliability is reduced due to the fact that the centrifugal forces acting on the permanent magnets and pole pieces, cause at the junction of rings a jumper concentration of mechanical stresses and lead to the destruction of the cage. The technical result, which can be achieved by the use of the invention is to improve the reliability and capacity of the electric machine by further increasing its speed. The technical result is achieved due to the fact that the center of radius of the outer cylindrical surface of each of the magnets is shifted along the longitudinal axis of the magnet in the direction of the outer surface of the non-magnetic casing with the formation of a smooth increase of the cross section of the shroud above the magnet and the pole tip from the longitudinal axis of the magnet to its sides (figure 1). When working design mechanical stresses are distributed uniformly over the cross section of the shroud above the magnet with pole NAC is mecnikom, from the longitudinal axis of the magnet to its sides, with no hubs mechanical stresses and peak stresses are approaching the module to the middle that leads to better use of the material clip and enables further increase of the rotor speed at a constant size of the electric machine. The rotor (figure 1) includes a shaft 1, the magnetic core 2 made of a uniformly alternating magnetic and non-magnetic annular plates placed on it by the permanent magnets 5 with the pole pieces 4. On the outer surface of the pole pieces 4 are annular grooves, which together with magnets 5 are placed in the Windows of the cage 3, is made in the form of an annular plate of a nonmagnetic material. The magnets 5 are designed so that the center of radius of the outer cylindrical surface of each of the magnets is shifted along the longitudinal axis of the magnet in the direction of the outer surface of the non-magnetic casing 3 with the formation of a smooth increase of the cross section of the shroud above the magnet 5 and the pole tip 4 from the longitudinal axis of the magnet to his sides. The magnetic core and the yoke can be made as massive and laminated. The device can be used in electric machines for various purposes. The rotor of the electric machine containing the shaft,the magnetic core, permanent magnets having an outer surface in the form of a cylinder, pole pieces and non-magnetic holder with Windows, evenly spaced around the circumference, in which are mounted permanent magnets and pole pieces on the outer surface of the magnets, characterized in that the center of the radius of the outer cylindrical surface of each of the magnets is shifted along the longitudinal axis of the magnet in the direction of the outer surface of the non-magnetic casing with the formation of a smooth increase of the cross section of the shroud above the magnet and the pole tip from the longitudinal axis of the magnet to its sides.
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