Synchronous micromotor with electromagnetic unipolar excitation |
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IPC classes for russian patent Synchronous micromotor with electromagnetic unipolar excitation (RU 2516286):
 Stator design for electric motors divided along axis / 2507662
Stator for an electric motor comprises a lengthy tubular body that defines a central cavity, in which a rotor may be installed. The rotor body defines a sequence of axial slots stretching in parallel to the axis of the body and a sequence of electric conductors stretching along channels for generation of electric windings. The rotor body is formed at least from two partially round segments of substantially one length. At the same time the segments determine the central cavity.
 Submersible synchronous electric motor / 2498484
Submersible synchronous electric motor contains stator with imbricated core installed in stator casing, the core has radial teeth on inner surface; inside stator there is rotor consisting of m stacked packs divided by central bearings; at outer surface of rotor there are also teeth; between rotor and stator there is a minimum positive allowance and at stator poles there are identical wound inductance coils connected into phases. Each phase consists of two parallel paths, and each path includes in-series diode and coils; diodes in parallel paths are connected in opposition. According to the invention at that each pole of stator has two grooves in which there is a slot wedge made of dielectric material; diodes are collected to rectifier block installed in stator; number of rotor central bearings is m+1, and rotor is fixed in stator due preloaded installation of the bearings.
 Synchronous jet engine with electromagnetic reduction / 2497264
Synchronous jet engine with electromagnetic reduction includes a toothed rotor with the number of teeth zp, a toothed rotor with uniformly distributed teeth zc, the number of which is related to the number of teeth of rotor zp by the ratio zp = zc ± p, where: p = 1, 2, 3… number of pairs of poles of m-phase winding located in the stator slots, each phase of which consists of semi-phases that are parallel and opposite connected to each other with diodes connected relative to the beginning of those semi-phases; those semi-phases are offset relative to each other through 180 electric degrees, and each semi-phase consists of p coil groups connected to each other. With that, according to this invention, coil groups of each semi-phase are connected parallel to each other, the number of slots of stator zn, in which m-phase winding is arranged, is equal to zn=zc/k, where: k= 1, 2, 3…, besides, m capacitors connected to each other are connected to m-phase winding, which at m equal to 3 are connected to each other as per a star network or a triangle network, along with phase windings.
 Six-phase valve-inductor motor controlled by three-phase current of sinusoidal shape / 2494518
Method is realised using facilities for observation of certain ratios of angular dimensions of poles of the motor rotor and its stator, even poles of which are equipped with one concentrated winding, and odd ones - with two concentrated windings, which are connected in a certain manner. Besides, in the proposed motor full currents of phase windings comprise in their composition only the first harmonic component and do not comprise higher harmonic components, and motor power supply is realised with three sinusoidal currents with the help of a three-phase bridge inverter, which is controlled by the relay-current method.
 Six-phase valve-inductor motor with minimum noise, vibrations and pulsations of torque, method and device of control / 2483416
In a six-phase valve-inductor motor derivatives of inductances of phase windings by an angle of rotor rotation have a sinusoidal shape, and higher harmonics are not available, due to certain ratios of angular dimensions of rotor and stator poles, and rotor poles have slants in axial direction. Besides, total currents of phase windings contain in their composition only zero and first harmonics and do not contain higher harmonics. It is achieved due to the fact that each pole of the stator is equipped with two windings, through one of which zero harmonic flows (a constant component), through the other winding current flows, having a sinusoidal shape. The amplitude of current of sinusoidal shape is equal to the DC value. Sinusoidal currents are formed with the help of a three-phase bridge inverter, and DC is generated with a half-bridge inverter. The relay-current method of control is used.
 Three-phase high-speed valve-inductor motor with minimum noise, vibrations and pulsations of torque, method and device of control / 2482591
In a three-phase high-speed valve-inductor motor the number of rotor poles is equal to doubled number of stator pole pairs, a magnetic conductor of the motor has such configuration of the rotor and stator that provides for permanent value of derivative inductances of phase windings by the angle of rotor rotation, the sign of which changes periodically with the period of 360 electric degrees, and the period of derivative inductances of phase windings by the angle of rotor rotation is shifted by 120 electric degrees, motor phases are switched by currents of special shape, which does not have breaks of derivatives at currents that are not equal to zero and provides for absence of current in points, where break of derivatives inductances of phases takes place by the angle of rotor rotation, the shape of these currents is provided by the control circuit with the help of a relay-current method of control.
 Three-phase valve-inductor motor with minimum noise, vibrations and pulsations of torque, method and device of control / 2482590
In a three-phase valve-inductor motor a magnetic conductor of the motor has such configuration of the rotor and stator that provides for permanent value of derivative inductances of phase windings by the angle of rotor rotation, the sign of which changes periodically with the period of 360 electric degrees, and the period of derivative inductances of phase windings by the angle of rotor rotation is shifted by 120 electric degrees, motor phases are switched by currents of special shape, which does not have breaks of derivatives at currents that are not equal to zero and provides for absence of current in points, where break of derivatives inductances of phases takes place by the angle of rotor rotation, the shape of these currents is provided by the control circuit with the help of a relay-current method of control.
 Electric reducer machine with polar gear inducer / 2477917
Electric reducer machine with a polar gear inducer contains a stator (its armature core made laminated and having clearly express poles on the inner surface whereof elementary cogs are arranged), the armature m-phase coil winding and a rotor containing an inducer with clearly express gear poles, symmetrically distributed along the cylindrical surface, with coil excitation winding placed on the poles. Electrical connection between the inducer excitation winding and the voltage source is effected via brushes and contact rings of the brush contact unit. Subject to definite ratios between number of clearly express armature poles, number of elementary cogs on a clearly express armature pole, number of clearly express armature poles per phase, total number of armature cogs, number of the inducer gear poles, total number of the inducer cogs, number of elementary cogs per inducer gear pole and number of phases in the m-phase armature winding of the electric reducer machine with a polar gear inducer the technical effect is achieved.
 Reactive switched electrical machine with rotation symmetry / 2450410
Reactive switched electrical machine with rotation symmetry consists of stator 1 with even number of poles Zs and coils 2 located on them with polyphase winding and even number of phases, windingless rotor 3 with odd number of poles Zr. According to invention number of stator poles is calculated as per the formula: Zs = 6·n where n=1, 2, 3…, number of rotor poles Zr is calculated as per the formula Zr = Zs ± 3. At that adjoining phase windings of stator have alternate polarity; all phase coils within limits of one phase are connected in opposition, magnetic field of active phase is closed through other phases and it allows development of polyphase electrical machine with even number of phases which magnetic structure has rotation symmetry with angle of rotation equal to 120°.
 Electromechanical drive of three-coloured head of raster image element / 2446547
Electric drive comprises a three-edged rotor, having an axis of rotation, passing through a centre of mass in parallel to edges, and a stator with a fixed position of poles arranged axially relative to the rotor, with a magnetic gap, the middle of which is displaced relative to the centre of rotation by the specified angle in direction of rotation, forming an axial electromagnetic system, making it possible to control the position of the rotor edges with the help of a unidirectional pulse action. The drive is equipped with a mechanism of rotor fixation, providing for rotor stability in one of three static positions, in which one of rotor edges always faces the side opposite from the stator relative to the rotation axis and serves a role of an element of raster image colour information unit transmission with the help of a colour coating of a required shade applied on it.
 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.
 Magnetoelectric generator / 2515998
In a magnetoelectric generator a rotor contains a disc fixed at a shaft whereat a ring-shaped line of permanent magnets with alternating polarity is mounted. The magnets are regularly spaced in regard to each other. A stator contains two parallel plates and the stator windings are placed between them at cores of electric steel, which are fixed at the stator plates. 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.
 Liquid-cooling system for electric machinery stators at autonomous objects / 2513042
According to the invention the suggested inductor-type generator containing the front and rear covers, a stator with operating winding, an excitation source and a rotor with a shaft, is equipped additionally with a ferromagnetic ring, closing elements, a star-shaped magnet core with an opening and a non-ferrous insert; at that the ferromagnetic ring is inserted tightly with its first lateral side in the stator zone free of end-connectors, at the other side of the ferromagnetic ring there are installed closing elements connected to sprocket teeth and the sprocket itself is connected to the rear cover by the non-ferrous insert and the rotor with the shaft is placed in a central opening of the sprocket.
 Modular electromagnetic device with reversible generator-motor operation / 2510559
Modular electromagnetic device has a stator and a rotor rotating between facing surfaces of the stator and bearing a plurality of magnets distributed with alternate orientations in a substantially annular pattern. The stator comprises at least one pair of magnetic yokes symmetrically located at both sides of the rotor. Each yoke has a pair of projecting arms extending towards the magnets and bearing a respective coil for receiving electric power from or supply of electric power to the electromagnetic device. Each yoke is individually mounted on its own support equipped with adjusting units arranged to adjust the yoke position relative to the oppositely lying magnets. The yoke forms, together with its coils, its support, its adjusting units and measuring and control means controlling the yoke adjustment, an elementary stator cell that can be replicated to form single-phase or multiphase modules.
 Modular electric machine / 2510121
Modular electric machine comprises electromagnetic modules, which consist of two U-shaped cores arranged with their ends to each other so that ferromagnetic inserts on the rotor installed between two cores match in the projection with ends of each pair of two U-shaped cores. Electromagnetic modules are fixed along the circumference without radial displacement relative to each other, windings of the anchor are wound separately on each rod of the U-shaped core, which are arranged further from the machine shaft, and the excitation winding is made toroidal, common for all electromagnetic modules of each fixed part of the stator, as a result of which rods of U-shaped cores that are close to the machine shaft are arranged tightly to each other, which results in maximum reduction of distance between electromagnetic modules. At the same time anchor windings of one phase displaced by a pole division are connected as matching in series.
 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: 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. EFFECT: improving reliability of the synchronous motor operation due to creation of permanent poles at the rotor in electromagnetic way without use of permanent magnets. 2 dwg
The invention relates to the field of electrical engineering, in particular, to a device for simultaneous micro (DM) with unipolar electromagnetic excitation. Synchronous motors can be used in automation circuits and appliances, low-power, from fractions of a watt to hundreds of watts, where the energy characteristics are not decisive. The main feature of synchronous motors is that the speed of rotation of the rotor is equal to the rotation speed of the stator field and rigidly connected to mains frequency [1, 2]. Widespread contactless DM with permanent magnetic [4]. In known constructions contactless DM with electromagnetic excitation not excitation winding, the excitation current generated by the permanent magnets mounted on the rotor. The greatest application received DM two design versions: with axial and radial location of the unit permanent magnets and package with squirrel-cage rotor winding [2]. Design with axial arrangement of the magnets used in the motors of small diameter with a capacity of up to 100 watts, and with a radial arrangement of the magnets in the motors of larger diameter with a power of 500 watts or more. The drawbacks of such thrusters are their high cost, complexity of manufacture and low the starting quality. In asynchronous acceleration thrusters, their result has been failure in the region of small slides [2]. The closest to the technical nature of the claimed device SD is selected as a prototype contactless DM with electromagnetic excitation, having a salient-pole rotor with the radial location of the unit permanent magnets and package with squirrel-cage rotor winding that generates the excitation current of the rotor and providing the electromagnetic torque in synchronous mode [2]. Squirrel-cage winding type a "squirrel cage", arranged in a laminated stack of electrical steel, provides electromagnetic torque asynchronous start. The stator prototype usual, in its grooves is distributed winding, which creates a rotating magnetic field of the stator. Known design DM has several disadvantages. Hard magnetic alloys and permanent magnets have a high cost, difficult machining, have low magnetic permeability, so that it is impossible the execution of the squirrel cage in the rotor, made entirely of such alloy. Therefore it is necessary to apply the pole pieces of electrical steel, in which is placed a short-circuited winding, which complicates the design, the operation of the rotor, its manufacturing and balancing. The presence of the rotor permanent magnets in asynchronous start leads to a braking torque that worsen the conditions of start-up under load or make it impossible, which makes the Board is unreliable. Reliability is also reduced due to the fact that under the influence of the reaction anchor under certain conditions may occur a partial, and sometimes irreversible demagnetization of the permanent magnets. To mitigate this phenomenon, it is necessary to apply special constructive measures, which ultimately causes an increase in the size, weight and cost of the machine [3, 6]. The aim of the invention is to improve the reliability of the synchronous micro by creating on the rotor of the permanent electromagnetic poles by without permanent magnets. This objective is achieved in that the stator, in addition to the stator core of a conventional circular shape with a distributed three-phase network winding that generates a rotating magnetic field, on both sides of the stator core has two annular coil winding (S), after the coils at the edges of the stators are two end annular core, lockable magnetic packages external magnetic circuit passing behind the stator cores. Between the outer cores and the stator pack has h the magnetic gap. The end cores and packages external magnetic circuit forming a magnetic circuit of the excitation current in the stator. On the rotor there are no permanent magnets and the starting cell, he neravnopolochny, cylindrical shape, has departures in both directions from the stator core, the conductive part of the rotor core with departures forms a magnetic circuit of the excitation current of the rotor. At the ends are short-circuited rings with low electrical resistance for the attenuation of transverse currents in the active zone of the rotor. Extreme parts of both flights of the rotor through an air gap magnetically connected with the two end cores of the stator, forming the closed magnetic circuit of the excitation current of the machine. S located on the stator directly connected to a constant current source. Conductive flights cores of the rotor located inside the annular coils S, provide the conditions for the occurrence of unipolar magnetic flux excitation, which is closed in the above elements of the magnetic circuit, having an axial direction, and cannot communicate with rotating radial field stator. To unipolar excitation of the rotating field of the stator can interact with the rotor, it is necessary to create two permanent rotor pole with consistently different polarity. This dostigaetsya virtue of the design of the rotor DM. The rotor is a solid solid cylinder of zhelezorudnogo alloy with high resistivity, separated by non-magnetic conductive layer on two magnetopolaron part in two further core of the rotor. In the active zone of the machine along the whole length of the air gap between the cores of the rotor and stator magnetic connection between the two cores of the rotor through the air gap and the back of the stator core, and the flow of excitation in both cores of the rotor changes direction from axial to radial. As a result, in the air gap between the stator cores and two cores of the rotor are formed by two radial flow, one incoming, the other opening, so that the cores of the rotor are formed of two magnetic poles with opposite and unchanging polarity: one of the cores of the rotor constantly North pole N, the other is constantly southern S. the Interaction of these "poles" of the rotor with the rotating stator field creates electromagnetic moment of synchronization, causing the rotor to rotate synchronously with the stator field. Solid solid core rotor allows the asynchronous start without starting cells, because its outer layers perform the role of a squirrel-cage winding. It is claimed device stator, the rotor and the excitation circuit SD,and mutual arrangement of their elements enables contactless electromagnetic unipolar excitation DM, when the rotor in the absence of permanent magnets are formed two permanent magnetic poles with the same polarity, the interaction of which with the rotating field of the stator creates a rotating electromagnetic moment of synchronization. A comparison of the proposed technical solutions to the prototype allowed us to establish the conformity of the invention, the criterion of novelty. The study of other known technical solutions in the field device synchronous motors features that distinguish the claimed device DM from the prototype, were not identified. therefore, they provide the inventive device according to the criterion of significant differences. The presence of a uniform air gap along the entire circumference of the stator provides a uniform distribution of flow excitation and formation time synchronization along the entire active zone, which greatly improves the performance of the BOD. This can be achieved by adjusting the magnitude of the field current rheostat in the circuit of the RC. When electromagnetic excitation there is no risk of demagnetization of the poles. The rotating magnetic field of the stator does not intersect the coils S and not suggestive in her EDS. dangerous in the initial asynchronous start, so there is no need at the time of start disable S from the power source and close it on the high the fight is their. Asynchronous start DM due to the massive cores of the rotor provides increased value of starting of induction time and decrease the magnitude of inrush current, which improves the starting properties of DM [5]. But in the process the asynchronous acceleration of rotor poles create a braking torque that causes the "collapse" of the resulting torque in the area of small frequencies. Therefore, the starting time may or disable S completely or be reduced during its start-up current; regulating the excitation current can be performed either manually or automatically by a special controller. The invention is illustrated by drawings, where figure 1 shows a longitudinal cross section of a structural scheme of the DM with two-pole stator (p=1) and two-pole rotor; figure 2 shows a cross-section of DM in the middle section in the core. On the stator DM is the package of the main magnetic core (stator core) 1 type, the grooves of which is a three-phase network winding 2; on both sides of the stator core are two annular coil 3, forming the excitation winding (S); after them at the ends, on both edges of the stator, there are two mechanical core annular shape with 4 lockable between a magnetic packages external magnetic circuit 5 mounted on the stator housing 6 with the outer side of the stator core 1. On the ends of the massive cores of the rotor 7 are short-circuited ring 9 with low electric resistance. The air gap 10 between the main magnetic circuit of the stator core 1 and the two cores of the rotor 7 is an active area in which there are basic electromagnetic processes SD. The cores of the rotor 7 outside of the active area in the departures are in the form of cylinders, in the active zone, the area of the air gap is a form of semi-cylinders. Extreme parts of both flights cores of the rotor 7 through an air gap magnetically connected with the two end cores 4, which are magnetically locked between the packages of the external magnetic circuit 5. Flights cores of the rotor 7, the socket 4 cores and packages external magnetic circuit 5 form the outer part of the magnetic circuit of the excitation current. In the active area due to the non-magnetic gap 8 cores of the rotor 7 magnetically linked through an air gap 10 and the back of the stator core 1. The semi-cylinders cores of the rotor 7, the air gap 10 between them and the cores of the stator and the back of the stator core 1 to form the inner part of the magnetic circuit of the flux, the excitation is Oia. Path circuit excitation current in the magnetic system SD is shown in figure 1 and figure 2 by dashed lines. As can be seen from these drawings, the excitation current, enclosed in the magnetic system, passes through the air gap four times, so to create the desired flow of excitation in the Board of Directors require substantial MDS winding. SD works as follows. Three-phase two-pole network, the stator winding 2 creates a rotating magnetic field. mud in the transverse plane and having a radial component. When powered with standard DC both reels 3, included under, create in the areas of magnetic circuit one common unipolar excitation current. In the external part of the magnetic circuit flows excitation have the same direction - axial and cannot interact with the stator field. In the active area, the flow of excitation in the rotor cores are changing the axial direction on the radial. The direction of flow of excitation in the areas of magnetic circuit shown in figure 1 and 2 by dashed lines. While in the air gap between the stator core and two cores of the rotor are formed by two radial flow directed in opposite directions, i.e. on the rotor are formed of two magnetic poles with opposite and unchanging polarity: one of the cores of the rotor constant the North "pole" N, the other constantly southern S. the Interaction of these "poles" of the cores of the rotor with a rotating magnetic field of the stator creates electromagnetic moment of synchronization. Start the considered DM asynchronous, like start AD with a massive rotor [5]. The absence of the rotor permanent magnets significantly reduces the costs and labor involved in its production, eliminates the risk of demagnetization of the poles. Massive cylindrical rotor makes the air gap is uniform along the entire circumference of the stator, which greatly improves performance, and allows the asynchronous start without starting cage with the best starting properties. S located on the stator, can directly connect to a power source, massive rotor allows the asynchronous start without starting cage. Sources of information 1. Armenski E.V., Falk G.B. Electric micro machines. - M., 1985. - 231 S. 2. Briskin DE, Zarkovic AU, Tails B.C. Electric cars and micro machines. - M.: Higher school, 1971. - 432 S. 3. Yermolin I.E. Electrical machines of low power. - M.: Higher school, 1967. - 504 S. 4. Katzman MM Electrical machines. - M.: Academy, 2003. - 496 S. 5. Burial grounds B.C. induction motors with two-layer rotor and their application. - M.: Energoatomizdat, 1983. - 119 C. 6. Petrov GN. Electric meters the bus. - M, ihei. 1963. - 416 S. Simultaneous micro (DM) with unipolar electromagnetic excitation with stator: normal core with three-phase network winding that generates a rotating magnetic field of the stator, two annular coil winding connected to the DC power source and generates the excitation current, as well as two ring core and the outer core, forming a path for the flow of excitation, and massive cylindrical rotor of zhelezorudnogo alloy, separated by non-magnetic conductive layer on two magnetopolaron part two of the core of the rotor, characterized in that, with the purpose of increase of reliability of work of the BOD, is a contactless electromagnetic unipolar excitation, in which two of rotor core is formed by two permanent magnetic poles always have a different polarity, North N and South S whose interaction with the rotating magnetic field of the stator creates a clock time, and the presence of the massive rotor cores provides him with asynchronous start without starting winding.
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