76results about How to "Short magnetic circuit" patented technology

The invention discloses a fault-tolerant type four-phase switch reluctance motor used for driving of an electric automobile. A stator is composed of a stator yoke and stator teeth. The stator teeth are formed by eight wide teeth and eight narrow teeth which are distributed along the circumferential direction of the internal circle of the stator yoke in a mutually alternating way. A rotor is composed of rotor iron core blocks and a rotor sleeve. There are ten rotor iron core blocks which are evenly distributed along the circumferential direction of the external circle of the rotor sleeve and fixedly embedded in the rotor sleeve so that the cylindrical rotor is formed by the rotor iron core blocks and the rotor sleeve together. One stator winding is wound on the eight wide teeth in a concentrated way, and winding directions on the adjacent wide teeth are identical so that NNNNSSSS polar distribution is formed, and the windings on the two opposite wide teeth are forwardly connected in series into a phase. Torque output capability is enhanced under the situation that the motor is not aligned in position. The separated rotor iron core blocks are adopted to embedded in the non-magnetic-conductive rotor sleeve so that the magnetic circuit is shorter, magnetic leakage is reduced and wind resistance is low. The narrow teeth with no winding can be used as the loop of magnetic flux to realize a shorter magnetic circuit and can also be used for isolation.

The invention discloses a permanent-magnet-biased axial magnetic bearing in the technical field of magnetic bearings. The permanent-magnet-biased axial magnetic bearing comprises a stator assembly and a rotor assembly; the stator assembly comprises an axial stator, an axial control winding, a septum magnet, a magnetizer and a permanent magnet; the rotor assembly comprises a rotation shaft and a rotor core; the axial control winding is wound on a magnetic pole of the axial stator; the rotor core is sleeved on the rotation shaft; the magnetizer is arranged in the axial stator, and the external end of the magnetizer is connected with the internal end of the axial stator; the septum magnet is arranged in the axial stator, the external end of the septum magnet is connected with the internal end of the axial stator; the permanent magnet is adhered to one side of the magnetizer, and the external end of the permanent magnet is contacted with the inner end face of the septum magnet; and the rotor core is arranged in the axial stator. The permanent-magnet-biased axial magnetic bearing has a simple structure, and is high in critical rotation speed, and low in power consumption; and magnetic flux flows in an axial direction and is decoupled with the radial suspension force completely, so the permanent-magnet-biased axial magnetic bearing is convenient to control.

The invention relates to a serial-magnetic-circuit hybrid-excitation permanent magnet motor, which comprises a case. A stator consisting of stator core and a stator winding, and a rotor consisting of a permanent magnet, a rotating shaft, a rotor core, an excitation winding and a nonmagnetic material are installed in the case. The stator winding is distributed in a slot which is circumferentially arranged in the stator core. The permanent magnet and the excitation winding are arranged on the rotor core. Magnetic motive force sources established by the permanent magnet and the excitation winding are connected in series in the form of magnetic circuits. The nonmagnetic material is arranged between the rotor core and the rotating shaft. By adjusting the current of the excitation winding, the air-gap magnetic field of a motor can be conveniently adjusted. The excitation winding is only used for realizing the auxiliary adjustment of the air-gap magnetic field and the effect of the permanent magnet is fully exerted; the main magnetic field adjusting capacity is better; the structure of the serial-magnetic-circuit hybrid-excitation permanent magnet motor is similar to the structure of a common synchronous motor, the power density is higher, and the optimization design of the motor winding and the magnetic pole shape is facilitated to obtain sinusoidal voltage waveform; and an additional air gap and an axial magnetic circuit do not exist.

The invention discloses a block-based switched reluctance motor with a short end part and a short magnetic circuit and a control circuit thereof. The motor comprises a motor stator and a block-based motor rotor; the stator comprises a stator core and a winding; a rotor part comprises rotor overlaid cores and a non magnetic framework; a plurality of stator teeth are uniformly distributed on the stator core; the stator winding is of a concentrated winding structure and wound on the stator teeth; the rotor overlaid cores are uniformly distributed at the inner side of the stator teeth and embedded in the non magnetic framework; a rotating shaft is arranged at the center of the non magnetic framework; during the running process of the motor, the motor at least has two electrified phases which are adjacent to each other; the route of the magnetic field inside the motor comprises the stator teeth of the two adjacent phases, as well as a stator yoke part, the rotor overlaid core and an air gap between the stator teeth of the two adjacent phases. When the motor disclosed by the invention runs, two adjacent phases are powered on and off at the same time, the width of the air gap magnetic field of the more is improved, the output torque of the motor is improved, and the force density of the motor is increased.

The invention discloses a transversal magnetic flux variable-reluctance permanent magnet motor which relates to the field of a motor and solves the problems of complicated secondary structure and low reliability and current control accuracy. The secondary structure comprises a secondary iron core. The primary structure at least comprises a phase unit. Each phase unit consists of a phase unit iron core, a phase unit winding and a permanent magnet. The phase unit core consists of a plurality of iron core units and is provided with a sprocket hole. The sprocket hole is formed by stacking gear slots of the iron core units. A permanent magnet is arranged on the sprocket of each iron core units, and the magnetic field directions of the magnets on sprockets of adjacent iron core units are opposite to each other. A coil is wound into a one-phase phase unit winding through the gear hole of the phase unit core. The motor can be used as a motor and also can be used as a generator. The permanent magnet of the motor is arranged on the gear of the core unit, therefore the secondary structure has simple structure and high reliability. The vortex loss of the motor is reduced, the motor efficiency is enhanced, the control accuracy of the current is high, and the motor is easy to modularize.

A wheel hub driving device with planetary motors comprises the planetary motors and planetary mechanisms. Each planetary motor comprises a gear ring stator and a plurality of planetary rotors radially arranged on the inner side of the gear ring stator; each planetary mechanism is used for matching rotate speed and torque of each planetary motor and a wheel hub and comprises a planetary carrier, a gear ring and a plurality of planetary gears; the planetary gears are radially arranged on the inner side of each gear ring; the planetary gears are meshed with the corresponding gear rings so as to enable the planetary gears to roll along the inner peripheries of the gear rings; the planetary gears are respectively in one-to-one correspondence to the planetary rotors, and the planetary gears are respectively coaxially connected with the planetary rotors; the planetary gears are respectively rotatably connected with the planetary carriers through rotating shafts so as to enable the planetary carriers to rotate with the planetary gears relate to the gear rings. The wheel hub driving device is higher in power density, reliability and fault safety. The invention further provides a wheel power system adopting the wheel hub driving device.

The invention discloses the cylindrical transverse flux linear motor of a zigzag ring winding structure, relating to the motor technology. The motor of the invention can be use for solving the defects of the mutual-inductance effect existing among windings of the traditional similar motor and the long magnetic field circuit caused by the windings. The air gap side of each annular iron core unit is radially provided with 2n-numbered grooves evenly distributed in the circumferential direction, a trough for embedding a coil is formed between every two axially adjacent annular iron core units, the coil wound around each annular iron core unit is evenly divided into 2n-numbered effective sections in the circumferential direction, a trough-crossing section is formed between every two adjacent effective sections, each trough-crossing section is embedded in one groove of the iron core, and two adjacent effective sections are respectively positioned at both sides of the annular iron core unit. The invention provides another motor which is not provided with the iron core unit, and is used for directly fixing a zigzag coil onto the side wall of the cylindrical iron core close to the secondary side. The motor of the invention can be used as both a motor and a generator, thereby having wide application prospects.

The invention provides a boss type magnetic liquid sealing device, and belongs to the technical field of mechanical engineering sealing. The problems that when an existing magnetic liquid rotary sealis under the working condition of high-speed rotation and the limited radial size, magnetic liquid is large in density and centrifugal force, so that the magnetic liquid rotary sealing device is insufficient in pressure resisting capacity or even fails are solved. The device is composed of a horseshoe type annular permanent magnet, pole shoes, flux insulation rings and the like. The radial size ofthe horseshoe type permanent magnet is reduced, a magnetic loop is shortened, and magnetic fields in sealing clearances are enhanced; and by means of the boss type middle pole shoe, the centrifugal force is effectively utilized, and the sealing performance of the device under the high-speed working condition is enhanced.

A three-dimensional triangular opening curling iron core with high performances and easy for production and maintenance is disclosed. The iron core uses three single phase opening curling iron cores (4), (5), (6) with the same shape to combine, at the central angle of 120 degrees, into the three-dimensional triangular opening curling iron whose section is elliptical or polygonal (an external ellipse). An core post section of each single phase opening curling iron core is semi-elliptical or polygonal (an external semi-ellipse), and a yoke section is the semi-ellipse which is as (2 / 3-1) time as the post section. Due to the opening of the iron core, windings can be singly manufactured, and when producing and maintaining, the iron core can be opened at the opening gaps for installation or replacement of the windings, the windings are sleeved within three core posts (1), (2), (3).

The invention provides an inter-phase electromagnetic decoupling flat permanent magnet synchronous straight line motor, which relates to the motor field and solves the problems that: the magnetic coupling existed between the phases influences the control precision of the current, and a magnetic path passed by a magnetic flux generated by each phase of winding is too long to cause a large consumption of the stator iron. The primary grade of the inter-phase electromagnetic decoupling flat permanent magnet synchronous straight line motor comprises phase units, wherein each phase unit comprises phase unit iron cores and phase unit windings; each phase unit iron core composes the phase unit iron core including tooth holes with 2k iron core units; the tooth holes are formed by superposing tooth grooves; each iron core unit is composed of two teeth and a magnetic yoke section; the two teeth are arranged along a horizontal direction of the cross section; the magnetic yoke section is connected between the two teeth; the 2k iron core units are arranged in a shell at interval along a moving direction; coils are wound into the phase unit winding through the tooth holes; when the motor is the m-phase motor, im phase units are existed therein; a centre distance L between two adjacent phase unit iron cores is L=[(j-1)+1 / m]tp. The inter-phase electromagnetic decoupling flat permanent magnet synchronous straight line motor is used as the motor or a generator.

The invention provides an asymmetric double-stator hybrid excitation type axial magnetic field flux switching motor. The asymmetric double-stator hybrid excitation type axial magnetic field flux switching motor comprises a first stator, a second stator and a rotor which are coaxially mounted, the first stator comprises a plurality of magnetic conductive iron cores and permanent magnets which are alternately arranged, each magnetic conductive iron core comprises two stator teeth a and a stator yoke part connected with the stator teeth a, parallel grooves a are formed between the two stator teeth a, and armature windings are wound between the adjacent stator teeth a of the adjacent magnetic conductive iron cores; the second stator is provided with a plurality of T-shaped grooves, the T-shaped grooves divide the second stator into a plurality of stator teeth b of a double-tooth structure, parallel grooves b are formed between double teeth of the stator teeth b, and the adjacent teeth of the adjacent stator teeth b are wound with armature windings and exciting windings at the roots of the stator teeth b; the rotor is arranged between the two stators, an air gap is reserved between therotor and the two stators, the rotor comprises a non-magnetic-conductive ring and a plurality of rotor teeth, and the rotor teeth are evenly distributed in the circumferential direction of the non-magnetic-conductive ring.

The invention provides an open type transformer three-dimensional roll-core. The three-dimensional roll-core is characterized in that the roll-core is composed of three identical iron core frames made of silicon steel sheets, and each iron core frame is formed by a hexagonal frame defined by an upper half frame and a lower half frame; the upper half frame is provided with a left and a right upper half frame bevel edge; the lower half frame is provided with a left and a right lower half frame bevel edge; the silicon steel sheets of two bevel edges at the same sides of the upper half frame and the lower half frame are arranged in a staggered manner; the silicon steel sheets of two bevel edges at the same sides are mutually inserted together to form the bevel edges of the iron core frames; the silicon steel sheets of each layer are connected at bending positions of the silicon steel sheets. The open type transformer three-dimensional roll-core has the positive effects that an iron core joint position of the roll-core is completely out of a coil, joint position fastening treatment can be very conveniently carried out after the iron core joint position is sheathed in the coil, and the roll-core is very conducive to transformer noise reduction and loss reduction. If a fault happens, the upper half frame of the iron core frame can be conveniently dismantled and the coil can be pulled out for maintenance.

The invention relates to the technical field of microwave and millimeter wave tests, in particular to a YIG electrically tunable filter magnetic circuit structure with high temperature stability. The YIG electrically tunable filter magnetic circuit structure comprises a tuning coil, wherein the tuning coil is fixed on a heat conducting bracket through heat conducting silica gel; the upper part of the heat conducting bracket is of a U-shaped ring structure, and is arranged in an annular groove formed by a machine shell and a magnetic pole head; the upper part of the heat conducting bracket is not in contact with the machine shell and the magnetic pole head; the heat conducting bracket passes through the machine shell and is fixed on a radiating block through a plurality of supporting columns arranged at the bottom part; and the plurality of supporting columns are not in contact with the machine shell. Through the scheme, the tuning coil can be isolated from the machine shell completely, the temperature rise of the magnetic circuit can be reduced, the temperature drift of a YIG electrically tunable filter is reduced, and the temperature stability of the YIG electrically tunable filter is improved.

The invention discloses an open rolled iron core dry-type transformer. The dry-type transformer comprises an iron core which is three-phase and three-column. The cross-section shapes of three core columns of the iron core are rectangular open rolled iron cores. Each layer is provided with two fractures, and the fractures are arranged at the three core columns. A low-voltage coil is arranged in the three core columns of the iron core, an insulating layer is tightly fixed outside the low-voltage coil, a high-voltage coil is arranged outside the insulating layer, an upper clamp piece and a lower clamp piece are fixed on the iron core, and the iron core draw a high-voltage terminal and a low-voltage terminal. The dry-type transformer has the advantages of being short in magnetic circuit, high in power factor, small in size, strong in sudden short circuit resistance, good in process condition and the like.

Provided is an open rolled iron core oil-immersed type power transformer with an elliptical section. According to the invention, defects in the laminated iron core performance and jointless rolled iron core manufacturing technology are thoroughly solved. The transformer is characterized in that an iron core frame is manufactured by winding silicon steel strip materials via circular, elliptical, tridimensional trigonal open iron core winders which are provided in the invention with the application number of 20060029267.9; the sections of three columns of the iron core are formed by butt connecting two indent hemicycles and a convex hemicycle, the sections of three columns of the iron core after assembling are ellipse, step-shape (internal ellipse) or polygon (internal ellipse) structures. Compared with a non-open rolled iron core dry transformer with a circular section, the oil-immersed type power transformer of the invention has shorter magnetic circuit, higher power factor, small volume, better processing performance, lower no-load loss and no-load current, reduced noise, and 10% or more reduced manufacturing cost; the transformer of the invention has the iron core with open characteristic, thereby, the coil can be winded singly, the transformer is easy to manufacture and maintain, and is suitable for the capability of 30 KVA to 3450 KVA.

The invention discloses a modularized magnetic liquid sealing device, and belongs to the field of mechanical engineering sealing. The device comprises a shaft, a sealing ring I, a sleeve, an annular permanent magnet I, a magnetic conductive ring, an annular permanent magnet II, a box body, a sealing ring II, a sealing ring III, an inner convex shoulder sleeve cup, a left bearing, a metal gasket I, a right bearing, a metal gasket II, an end cover, a round nut I, a round nut II and a flat set screw. Contact type end face sealing is changed into magnetic liquid sealing, frictional wear and temperature rise of the two sealing surfaces are reduced, the modularized magnetic liquid sealing device does not need to be disassembled and assembled complexly and is directly replaced by spare parts after being damaged, and the shutdown time is shortened. Axial sealing is changed into radial sealing, the axial size of the sealing device is reduced, and meanwhile the sealing device can bear small-amplitude radial vibration. The two annular permanent magnets with opposite magnetic pole directions are used, so that a magnetic circuit is shortened, the magnetic field intensity of a sealing gap is enhanced, and the sealing capability is improved.

The invention discloses a permanent magnet synchronous motor with an interphase uncoupled structure, relating to the field of motors and solving the problem that the control precision of current is influenced because magnetic coupling exists between phases and the defect that stator iron loss is larger because a magnetic circuit passed by magnetic flow generated by electrifying each group of windings is longer. The phase unit of a stator comprises a plurality of phase armature iron cores and a plurality of phase armature windings, wherein each phase armature iron core comprises 2k iron core units; each phase armature iron core is a phase armature iron core with comprises 2k iron core units and has a tooth hole; the tooth hole is formed by superposing tooth slots; the two teeth of each iron core unit are arranged along the axial direction; a magnet yoke section is connected between the two teeth; 2k iron core units are sequentially arranged in a housing case at equal intervals along the peripheral direction; and coils are wounded into single-phase armature windings by tooth holes. The motor has im phase units when being an m-phase motor, and the included angle between the axes of two adjacent phase armature windings is an electrical angle of [(j-1)+(1 / m)]*180 degrees. The permanent magnet synchronous motor not only can be used as an electromotor but also can be used as a generator.

A high performance dry power transformer is characterized in that an iron core frame is configured that a two-square-shaped rectangular frame is constructed by abreast arranging two open rolled iron cores which has square shapes and indent semiellipse sections, and which is formed by winding silicon steel strip materials via circular, elliptical, tridimensional trigonal open iron core winders which are provided in the invention with the application number of 20060029267.9, and the two-square-shaped rectangular frame is packaged in an open rolled iron core rectangular frame with a convex semiellipse section, the sections of three columns of the iron core are formed by butt connecting two indent hemicycles and a convex hemicycle, the sections of three columns of the iron core after assembling are ellipse, step-shape or polygon cylinders. Because of the open characteristic of the iron core, the coil can be winded singly, and the coil can be mounted or replaced by opening the iron core at a U-shaped position of an open slot during production and maintaining; in this way, a triphase epoxide resin dry transformer and a non-enveloped insulative dry transformer with a capability of 30 KVA to 3450 KVA can be produced.

The invention provides a dry-typed electric transformer, comprising an iron core, a low-voltage coil (13), an insulation layer (15), a high voltage coil (14), an upper clamping part (12), a lower clamping part (11), a high voltage wiring terminal (16) and a low voltage wiring terminal (10). The iron core is formed by that two open coiled iron cores with O-shaped appearance and internally concave semi-round section are arranged in parallel to form a transverse theta-shaped rectangle frame; another open coiled iron core rectangle frame with externally convex semi-round section wraps the transverse theta-shaped rectangle frame. The section of three columns of assembled iron core can be round or step-shape (circumcircle shape) or polygon (circumcircle). As the iron core has opening characteristic, the coil can be enwound separately, and the iron core at the U-shaped opening gap can be opened to carry out the installation or to replace the coil during the production and maintenance, thus leading the whole process to be convenient and fast.

The invention relates to a dry transformer, characterized in that an iron core frame is formed by machining and winding silicon steel strip materials via circular, elliptical, tridimensional trigonal open iron core winders which are provided in the invention with the application number of 20060029267.9, sections of three columns of the iron core are butt-connected by two indent semiellipses and a convex hemicycle; all of the sections of three columns of the iron core and the section of the whole iron core are ellipses, step shapes and polygons. Compared with a non-open rolled iron core dry transformer with a circular section, the dry transformer of the invention has shorter magnetic circuit, higher power factor, small volume, better processing performance, lower no-load loss and no-load current, reduced noise, and 10% or more reduced manufacturing cost; the dry transformer of the invention has the coil capable of being winded singly, is easy to manufacture and maintain, and has a capability reaching 30 KVA to 3450 KVA.

This invention relates to suspend electromagnets for high speed magnetic suspend vehicles and their manufactured method, in which, the magnet includes a core and suspend coils characterizing that the chip of the core and an end plate are opened with key slots at the corresponding places of both side edges and pin keys fixedly connecting the chip and the end plates are set in the key slots with an insulation layer set between them and the suspend coil is composed of an internal insulation bush closely adhered to the core and winded to formation on it and excitation coils winded directly.

The invention discloses a plastic electronic horn. A common car horn uses an iron shell, and an iron gland bush is riveted with a steel membrane to form a sound-producing device. The horn with the structure has high cost, heavy weight, complex manufacture craft, high energy consumption, common sound effect and not high enough sound level. The invention comprises a coil (4); the coil (4) is linkedwith an iron bowl (6); the iron bowl (6) is linked with a plastic shell (5); and the opening of the iron bowl (6) is linked with a steel vibrating sheet (3). The invention relates to an electronic horn used for a car.

This invention relates to a sandwich structure of an intelligent material of magnetic flow change solution including magnetic flow changed solution, an excitation coil generating magnetid field and up and down sandwich beams, in which, the magnetic flow changed solution and the excitation coil are inserted in the matrix of the up and down sandwich beams, and the solution, the excitation coil and the matrix are combined to one unit, which can alter the rigid and damp of the structure by altering input current.

The invention discloses a permanent magnet direct current energy adding motor. The permanent magnet direct current energy adding motor comprises an enclosure(13), a permanent magnet rotor unit, a reversing system assembly and a permanent magnet energy adding device stator pole assembly; the permanent magnet energy adding device stator pole assembly is fixed in the enclosure (13), and the permanent magnet rotor unit is arranged at the inner side of the permanent magnet energy adding device stator pole assembly; the permanent magnet rotor unit is installed on a front end cover (15) and a rear end cover (10) through a bearing (2); the front end cover (15) and the rear end cover (10) are respectively installed on the front end and the rear end of the enclosure (13); and a motor shaft (1) of the permanent magnet rotor unit is further equipped with the reversing system assembly. The permanent magnet direct current energy adding motor provided by the invention has the advantages of being high in permanent magnet energy utilization, obvious in energy-saving effect, simple in structure and low in cost.

An iron core of a power transformer is composed of two opened spiral type cores with semicircular sections arranged in parallel and an opened spiral core which surrounds the panes outside the two cores and also has a semicircular section. The sections of three stems are rotundity, step shape (circumscribed circle) and polygon (circumscribed circle). During the manufacture process, as the opened characteristics of the cores, loops can be independently coiled and the cores can be opened on the location of the opened clearance to mount or exchange the loops when in manufacturing and maintaining.

A dry power transformer comprises an iron core, a low-voltage coil (13), an insulative layer (14), an upper clip member (10), a lower clip member (11), a high-voltage connecting terminal (16) and a low-voltage connecting terminal (12). The iron core is configured that a two-square-shaped rectangular frame is constructed by abreast arranging two open rolled iron cores with square shapes and indent semiellipse sections, and the two-square-shaped rectangular frame is packaged in an open rolled iron core rectangular frame with a convex semiellipse section. The sections of three columns of the iron core after assembling can be ellipses, step shapes (external ellipses) or polygons (external ellipses). Because of the open characteristic of the iron core, the coil can be winded singly. The coil can be mounted or replaced by opening the iron core at a U-shaped position of an open slot during production and maintaining, so that the whole process is convenient.

The invention relates to a tangential / radial parallel hybrid excitation synchronous motor, belonging to hybrid excitation synchronous motors. Wherein, the stator is made up of a stator core and an armature winding, etc, the rotor is made up of a rotor core(3), a permanent magnetism piece(10),an excitation winding(4) and a rotating shaft(9),etc; the tooth of the rotor core is wined with excitation coils which are connected to form the excitation winding(4), the magnetic poles of different tools change alternately, the electric excitation field forms a radial structure, the permanent magnetismpiece(10) is inserted between two adjacent pole terminals(31) of the rotor core(3) ,the permanent magnetism field forms a tangential structure and two adjacent permanent magnetism pieces are parallel, and the polarity of the magnetic field is same as that generated by the excitation coils on the magnetic poles, which two together form the main magnetic field. The magnetic filed of the permanent magnetism and the excitation winding is also parallel, the main magnetic field can adjust easily and has the advantages of high excitation efficiency, great power density, convenient control, etc. Themotor with a simple structure can be a main generator of the device of the airplane, naval vessels, vehicle, etc; be a waterwheel, a steamer, an aerogenerator, etc; and also be a motor.

The invention discloses a U-shaped combined lifting electromagnet. The U-shaped combined lifting electromagnet comprises electromagnetic units and a magnet yoke. The number of the electromagnetic units is even number and at least equal to 4. One end of an iron core of each one of the electromagnetic units is fixedly connected to the magnet yoke. The axis of the iron core is perpendicular to the magnet yoke. From the electromagnetic unit fixedly connected to the end of the magnet yoke, each two electromagnetic units form a U-shaped electromagnet, and magnetic polarities of the two adjacent electromagnetic units of each two adjacent U-shaped electromagnets are the same. The electromagnetic units are connected to the magnet yoke by bolts. The U-shaped combined lifting electromagnet has the characteristics of low energy consumption, light deadweight and maintenance convenience.

The invention discloses a mixed-excitation synchronous motor with a tripolar combination, and belongs to the technical field of motors. The mixed-excitation synchronous motor comprises a case (1), a stator core (2), armature windings (3), a rotor core (4), a permanent magnetic pole (5), ferromagnetic poles (6), exciting windings (7) and a rotating shaft (8). The armature windings are distributed in stator core grooves, and poles of the armature windings are identical to poles of rotors in number. According to the tripolar combination of the rotor core, the permanent magnetic pole is arranged in the middle, and the ferromagnetic poles are arranged on two sides. The exciting windings are placed in grooves on two sides of the tripolar combination, and the number of poles of each exciting winding is one third of that of the poles of the rotors. During motor operation, the exciting windings can be powered by an excitation system with or without a brush; wide range adjustment of a magnetic field of the motor can be achieved only by excitation capacity which is about one third of excitation capacity of a common synchronous motor. Compared with the prior art, the mixed-excitation synchronous motor has the advantages of simple structure, few permanent magnetic material consumption, high motor efficiency, high magnetic field adjustment capability and capability of adapting to wide range operation speed requirements.