CN109274240B - Composite Amorphous Alloy Axial Flux Motor - Google Patents

Abstract

A composite amorphous alloy axial flux motor, a plurality of inner teeth and outer teeth of the stator are evenly distributed on the stator yoke in the circumferential direction, the stator iron core is embedded in the casing, and the DC excitation winding is wound on the outer teeth. , each outer tooth part and its inner tooth part are also wound with armature windings as a whole, the rotor is assembled on the rotating shaft, the permanent magnet and the first soft magnetic pole are circumferentially evenly installed on the side of the rotor yoke close to the stator, the permanent magnet In contact with the first soft magnetic pole, the permanent magnet and the first soft magnetic pole correspond to the circumferential position of the inner tooth portion, the second soft magnetic pole corresponds to the circumferential position of the outer tooth portion, and the second soft magnetic pole and its circumferential inner side. The permanent magnets are separated by a magnetic isolation area, end covers are respectively provided at both ends of the casing, and the rotating shaft of the motor is supported in the center of the end covers through bearings. The invention can not only inherit the characteristics of high power density, high torque density and high efficiency of the axial magnetic flux permanent magnet motor, but also has the advantages of smooth and adjustable air gap magnetic field of the electric excitation motor.

Description

Composite Amorphous Alloy Axial Flux Motor

technical field

The invention belongs to the field of axial magnetic flux motors, and mainly relates to a composite amorphous alloy axial magnetic flux motor.

Background technique

As a new type of soft magnetic material, amorphous alloy strip has a thickness of only 0.02-0.03mm, excellent electromagnetic properties, good corrosion resistance, wear resistance, extremely high strength, hardness and resistivity and other characteristics. Compared with traditional silicon steel sheets, amorphous alloys have extremely small core losses, and when used in motors as iron core materials, they can significantly improve the efficiency of motors, especially for high-speed and high-frequency applications. The traditional amorphous alloy axial flux permanent magnet synchronous motor adopts the double stator single rotor or double rotor single stator structure with permanent magnet surface mount (or permanent magnet embedded in non-magnetic metal disk). It has the advantages of high efficiency, high power density and high torque density. However, due to the inherent characteristics of permanent magnet materials, the air-gap magnetic field in the amorphous alloy axial flux permanent magnet synchronous motor remains basically constant, and the traditional amorphous alloy axial flux motor generally adopts the above surface-mounted magnetic pole structure. The air gap of this structure is large, the inductance is small, and the inductance of the AC and direct axes is basically equal. The motor has many problems such as difficult excitation adjustment, narrow field weakening speed adjustment range, and relatively large amount of permanent magnets, which has become one of the bottlenecks restricting the development of this motor. one. The application of amorphous alloy axial flux permanent magnet synchronous motor has received great constraints.

In order to pursue the effect of high power torque density, high efficiency and controllable magnetic field of the motor, many researchers have proposed different types of topological structures in the form of hybrid excitation to solve the problem that the magnetic field of the traditional permanent magnet synchronous motor is difficult to adjust and is not conducive to weak field speed expansion. and other problems, but still have different degrees of defects:

(1) Chinese patent CN105305749A proposes a stator coreless Halbach permanent magnet array axial flux motor. It has two permanent magnet rotors, the two permanent magnet rotors are installed on the rotating shaft in a way that the permanent magnet faces are opposite to each other, and a ring composed of polymer materials is installed between the rotors; Radial guide slots are regularly arranged to install the stator winding coils of the excitation wire; the permanent magnet rotor is composed of segmented permanent magnets of the rotor magnetic conductive back yoke: 12 permanent magnets with different magnetization aspects are installed under each pair of poles. For the magnet, the axial magnetization aspect of the first permanent magnet is defined as 0 degrees, and the magnetization directions of the adjacent permanent magnets are sequentially changed by 30 degrees, thereby realizing a Halbach array. The characteristics of the invention are: by magnetizing the permanent magnets on the rotor of the axial flux motor according to the Halbach array, the harmonic content of the air gap magnetic density is greatly reduced, but the structure and process are complicated and the consumption of permanent magnets is high. More, is not conducive to the promotion of production.

(2) Chinese patent CN103997145A proposes an axial flux permanent magnet synchronous motor. The motor includes a rotating shaft, a rotor is assembled to the rotating shaft, at least one permanent magnet is assembled to the rotor, and also includes a stator assembly, the stator assembly includes stator modules oriented in an axial direction, and each stator module includes a pair of yoke parts. Connected stator teeth and multiple windings, each wound on a stator module. The invention is characterized in that the axial flux motor uses low-cost ferrite magnets, and achieves higher power density and efficiency achieved by other high-cost neodymium iron boron, and does not generate cogging torque, vibration, etc. The noise has been reduced to some extent, but it is difficult for the motor to exert its advantages in high frequency and high speed occasions.

(3) Chinese patent CN10530757A proposes a topological structure of a double interleaved hybrid excitation motor. The motor includes a front end cover, a rear end cover and a casing. A rotor yoke is provided on the rotating shaft. The rotor yoke has inherent permanent magnet N pole and permanent magnet S pole and iron pole, the casing is evenly provided with armature iron core and field core, the armature iron core is provided with AC armature winding, and the field core is provided with AC excitation winding; rotating shaft, rotor yoke, permanent magnet N pole, permanent magnet S pole The rotor and the iron pole constitute the rotor; the AC armature winding, the armature iron core, the AC excitation winding, the excitation core and the casing constitute the stator. The characteristics of the invention are: the motor is a radial magnetic flux structure, the air gap magnetic flux is adjusted by AC current, the excitation magnetomotive force and the armature magnetomotive force are in a parallel relationship, and the induction is changed by adjusting the distribution of the magnetic flux. The size of the electric potential can achieve a wider range of speed regulation in variable-speed electric occasions, but the motor has a complex manufacturing process and is not suitable for high-frequency and high-speed applications.

(4) Chinese patent CN104638792A proposes a topology structure of a hybrid excitation motor. The motor includes a stator and a rotor arranged in the stator. The rotor includes a rotor frame that constitutes the main support part of the rotor, as well as magnetic steel and excitation windings arranged on the rotor frame. The rotor frame is evenly provided with a number of motor poles along the circumference of the transverse interface. A first magnetic steel composed of permanent magnets is arranged between adjacent motor poles, and a second magnetic steel composed of permanent magnets and an excitation winding are arranged in the motor poles; the first magnetic steel and the second magnetic steel are close to one end of the rotor circumference The magnetic poles are the same, and the volume of the first magnet is larger than that of the second magnet. The characteristics of the invention are that the motor has a larger speed regulation range and less rare earth usage, which reduces the manufacturing cost, but the torque density, power density and efficiency of the motor are reduced, which is not conducive to application in High frequency and high speed occasions.

(5) Chinese patent CN103490583A proposes a stator-split axial flux switching hybrid excitation synchronous motor topology. The motor stator consists of inner and outer two layers of "H" type unit stator cores spliced into two wound concentric rings , the magnetic isolation ring separates the two concentric rings, the armature winding adopts the concentrated winding, the armature winding is wound on the stator teeth of the two adjacent "H" type unit stator cores, the permanent magnet and the stator slot are all rectangular structure, The excitation bracket is located just above the permanent magnet and is separated by a magnetic isolation ring. The excitation winding is axially wound on the excitation bracket. The rotor adopts a disc structure, including the rotor yoke and the rotor poles fixed radially and uniformly on its surface. The stator and the rotor are the same. shafts are connected. The stator is divided into inner and outer parts by a magnetic isolation ring. The invention is characterized in that the electric excitation magnetic circuit and the permanent magnet magnetic circuit are completely connected in parallel, the coupling between the two magnetic circuits is reduced, the utilization rate of the permanent magnet is greatly improved, and the motor efficiency is obviously improved. However, the torque density, power density and efficiency of the motor have decreased, and the range of vibration and noise expansion is limited, so it is not used in high-frequency and high-speed applications.

(6) Chinese patent CN1808846A proposes a double-fed hybrid excitation axial magnetic field permanent magnet motor topology. The motor includes a rotor and two left and right stators placed on both sides of the rotor. The magnetic poles of the rotor are divided into two inner and outer circles by the magnetic isolation area, the outer circle is the iron core pole, and the inner circle is a permanent magnet with alternating polarities; The inner side of the outer teeth is installed with the magnetic field control winding, while the main armature winding is installed around the inner and outer teeth. The characteristics of the invention are: by changing the current amplitude and direction in the magnetic field control winding to adjust the total magnetic flux of the air gap of the motor, to achieve the purpose of changing the size of the induced potential, but the structure of the motor has a large amount of permanent magnets and weak magnetic field expansion speed. The scope is rather limited.

SUMMARY OF THE INVENTION

Purpose of invention

The air gap magnetic field in the axial flux permanent magnet synchronous motor is basically constant, and the air gap is large, and the number of series turns of each phase is small, which is not conducive to the weak field speed expansion. In order to realize the simple, flexible, cost-effective adjustment and control of the air-gap magnetic field of the axial flux permanent magnet synchronous motor, so as to improve the speed regulation and driving performance of the motor, and avoid the irreversible demagnetization of the permanent magnet, a composite non-reversible magnetic field is introduced. Crystalline alloy axial flux motor.

Technical solutions

A composite amorphous alloy axial flux motor, comprising a stator, a casing, an end cover, a rotating shaft, a bearing and a rotor, characterized in that the stator core is an amorphous alloy stator core, and the stator core includes a stator yoke and a stator. There are two parts of teeth. The stator teeth are composed of inner teeth and outer teeth. A plurality of inner teeth and outer teeth are evenly distributed on the stator yoke in the circumferential direction. The inner side of each outer teeth has an inner teeth. The teeth, the stator core is embedded in the casing, the DC excitation winding is wound on the outer teeth, and a first insulator is arranged between the DC excitation winding and the outer teeth, and the inner teeth of each outer teeth and its inner teeth are The whole is also wound with an armature winding. A fourth insulator is arranged between the armature winding and the DC excitation winding inside. The rotor is assembled on the rotating shaft. The rotor includes a rotor yoke, a rotor bracket, a second soft magnetic pole, a permanent magnet and a first soft magnetic pole. , the second soft magnetic pole, the permanent magnet and the first soft magnetic pole are evenly installed on the side of the rotor yoke close to the stator, the inner side of each second soft magnetic pole has a permanent magnet, and the inner side of each permanent magnet has a first soft magnetic pole A soft magnetic pole, the permanent magnet and the first soft magnetic pole are in contact with each other, the permanent magnet and the first soft magnetic pole correspond to the circumferential position of the inner tooth portion, the second soft magnetic pole corresponds to the circumferential position of the outer tooth portion, and the second soft magnetic pole corresponds to the circumferential position of the outer tooth portion. The magnetic poles are separated from the permanent magnets on the inner side in the circumferential direction by the magnetic isolation area, end covers are respectively provided at both ends of the casing, and the rotating shaft of the motor is supported in the center of the end covers through bearings.

The stator teeth are located on both sides of the stator yoke, rotors are provided on both sides of the stator core, the rotor yoke is made of soft magnetic material, and the magnetic poles of the permanent magnets of the rotors on both sides are opposite to each other and have different polarities, forming a single type. In the axial flux motor with stator and rotor structure, the armature windings and the DC excitation winding are arranged in a ring on the radial plane and have non-overlapping properties. The two sets of armature windings and the DC excitation winding are completely symmetrical in the axial direction.

The stator core is wound with amorphous alloy strips, the teeth of the stator core are divided into two parts, the inner teeth and the outer teeth, and there is an auxiliary slot between the inner teeth and the outer teeth to assist The slots correspond to the circumferential position of the magnetic isolation area of the rotor, and radial slots are formed between the teeth of adjacent stator cores. The DC excitation winding is wound on the outer teeth through the radial slots and auxiliary slots. The teeth are in contact with the inner teeth on the inside.

The DC excitation winding is located on the outer circumference of the outer tooth portion and is surrounded by stator armature windings on three sides. A first insulator is arranged between the DC excitation winding and the outer tooth portion, and a second insulator is arranged in the auxiliary slot. A fourth insulator is arranged between the excitation winding and the stator armature winding, and a third insulator is arranged between the stator armature winding and the inner teeth.

The second insulator is air or insulating paper.

The first insulator, the third insulator and the fourth insulator are all insulating paper.

The outer tooth portion and the inner tooth portion are roughly in the shape of a sector, and their respective sides far from the center of the rotor are circular arcs with their centers at the center of the rotor, and their respective sides close to the center of the rotor are straight lines or arcs that generally point to the center of the rotor. The remaining two edges are straight, and smooth chamfers are set at the vertices to avoid scratching the winding wire.

The rotor adopts a double-disc structure with soft magnetic poles on the inner and outer circumferences. The rotor yoke is attached with soft magnetic poles on the surface close to the stator side and the outer teeth of the stator core are directly corresponding, and the surface of the rotor yoke is close to the stator side and the inner teeth. The permanent magnets and soft magnetic poles that are in contact with each other are attached to the right positions, and the position of the rotor yoke on the surface close to the stator side and the auxiliary slot of the stator core is the magnetic isolation area.

The permanent magnet is located between the first soft magnetic pole and the second soft magnetic pole, and the polarity is alternately distributed in the circumferential direction, the first soft magnetic pole and the second soft magnetic pole are made of ferromagnetic material, and the first soft magnetic pole and the second soft magnetic pole are The number of soft magnetic poles and permanent magnets is equal, which is equal to the number of poles of the motor.

A method for manufacturing an amorphous alloy stator core of the composite amorphous alloy axial flux motor, characterized in that:

Select the width of the amorphous alloy strip according to the required axial size of the stator core, and then wind the amorphous alloy strip on the mold with the inner diameter according to the inner diameter and outer diameter of the stator core, and subtract the inner diameter from the outer diameter. After the layers are tightly laminated, annealing, varnishing, shaping and curing are carried out. After curing, the left and right end faces of the stator core are cut radial grooves by laser cutting, EDM cutting or water jet cutting to form stator teeth. The stator teeth are then cut again along the circumference to generate auxiliary slots to form a stator core with inner and outer circumferential teeth.

Advantages and Effects

The present invention is a composite amorphous alloy axial flux motor, which has the following advantages and beneficial effects:

(1) The present invention proposes a structure in which the stator core teeth are divided into inner and outer layers, and the DC excitation winding is sleeved on the outer stator core teeth, which is beneficial to change the air gap magnetic field by adjusting the excitation current on the DC excitation winding. size.

(2) The magnetic flux generated by the DC excitation winding for controlling the magnetic field proposed by the present invention forms a loop through the soft magnetic pole, the air gap, the rotor yoke, the teeth of the stator core and the yoke of the stator core, which can easily realize the control of the magnetic field. The damage of demagnetization of the permanent magnet is generated, and the reliability of the motor operation is improved.

(3) The position of the inner surface of the rotor facing the inner teeth of the amorphous alloy stator iron core proposed by the present invention adopts the connected permanent magnet and the soft magnetic pole. The current can make the soft magnetic pole connected to the permanent magnet generate an opposite magnetic field, and can weaken the magnetic field to a greater extent so that it has a wider operating speed.

(4) The structure of the outer layer of the inner surface of the rotor proposed by the present invention, and the inner layer of the permanent magnet and the soft magnetic pole, which are connected to each other, can reasonably arrange the space occupied by the permanent magnet and the soft magnetic pole according to the actual work needs. On the basis of ensuring the basic power of the motor, the required air-gap magnetic field strength and the adjustment of the motor speed range can be achieved. At the same time, the combination of the permanent magnet and the soft magnetic pole is used to reduce the amount of permanent magnets and reduce the The manufacturing cost of the motor.

(5) The stator iron core made of an amorphous alloy winding proposed by the present invention, because the amorphous alloy material has significantly less iron loss at high frequency than the traditional silicon steel sheet, so this kind of motor is especially suitable for In the case of high frequency and high speed, in addition, the auxiliary notch of the motor teeth is divided into two layers, the inner and outer layers. Since the two parts of the stator teeth are separated, it is beneficial to reduce the stator core teeth of the amorphous alloy axial flux motor at high speed. loss of the part.

Description of drawings

FIG. 1 is a schematic structural diagram of a composite amorphous alloy axial flux motor;

Figure 2 is a schematic diagram of the rotor structure of a composite amorphous alloy axial flux motor;

Figure 3 is a schematic diagram of the stator slot and tooth structure of the composite amorphous alloy axial flux motor;

Figure 4 is a schematic diagram of windings and insulation on a single stator tooth;

Figure 5 is a schematic diagram of the winding and insulation of the outer teeth of the stator.

Description of reference numbers:

1. Rotor yoke, 2. Second soft magnetic pole, 3. Magnetic isolation area, 4. Permanent magnet, 5. First soft magnetic pole, 6. Stator yoke, 7. Armature winding, 8. DC excitation winding, 9. Outer Teeth, 10. Internal teeth, 11. Stator teeth, 12. Rotor bracket, 13. Auxiliary slot, 14. Radial slot, 15. First insulator, 16. Second insulator, 17. Fourth insulator, 18 . The third insulator.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings:

As shown in Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5, a composite amorphous alloy axial flux motor includes a stator, a casing, an end cover, a rotating shaft, a bearing and a rotor, and is characterized in that: The stator core is an amorphous alloy stator core. The stator core includes two parts: the stator yoke 6 and the stator teeth 11. The stator teeth 11 are composed of inner teeth 10 and outer teeth 9. A plurality of inner teeth 10 and outer teeth 11 are formed. The tooth parts 9 are evenly distributed on the stator yoke part 6 in the circumferential direction. There is an inner tooth part 10 on the inner side of each outer tooth part 9. The stator iron core is embedded in the casing, and the DC excitation winding 8 is wound on the outer tooth part 9. And a first insulator 15 is arranged between the DC excitation winding 8 and the outer teeth 9, and each outer teeth 9 and the inner teeth 10 on the inside thereof are also wound with an armature winding 7, and the armature winding 7 and its interior are also wound with an armature winding 7. A fourth insulator 17 is arranged between the DC excitation windings 8 of the stator, and the use of this stator tooth block structure is beneficial to reduce the loss on the stator iron core and improve the performance of the motor. The stator teeth 11 are located on both sides of the stator yoke 6, the stator core is provided with a rotor on both sides, the rotor is assembled on the rotating shaft, and the rotor includes a rotor yoke 1, a rotor bracket 12, a second soft magnetic pole 2, a permanent magnet 4 and a first The soft magnetic pole 5, the second soft magnetic pole 2, the permanent magnet 4 and the first soft magnetic pole 5 are evenly installed on the side of the rotor yoke 1 close to the stator in the circumferential direction, and there is a permanent magnet 4 on the inner side of each second soft magnetic pole 2. The inner side of each permanent magnet 4 has a first soft magnetic pole 5, the permanent magnet 4 and the first soft magnetic pole 5 are in contact with each other, the permanent magnet 4 and the first soft magnetic pole 5 correspond to the circumferential positions of the inner teeth 10, and the second The soft magnetic pole 2 corresponds to the circumferential position of the outer teeth portion 9 , and the second soft magnetic pole 2 is isolated from the permanent magnet 4 on the inner side in the circumferential direction by the magnetic isolation region 3 , which is air. The rotor yoke 1 is made of soft magnetic material, and the magnetic poles of the permanent magnets 4 of the rotors on both sides are opposite to each other and have different polarities, forming an axial flux motor with a single stator and double rotor structure. The armature winding 7 and the DC excitation winding 8 The two sets of armature windings 7 and the DC excitation windings 8 are completely symmetrical in the axial direction. The permanent magnets 4 , the first soft magnetic poles 5 and the second soft magnetic poles 2 are respectively pasted on the surfaces of the rotor yoke 1 on the sides of the rotors on both sides close to the stator. However, the fixing method of the permanent magnet 4, the first soft magnetic pole 5 and the second soft magnetic pole 2 is not limited to gluing, but can also be connected by drilling holes on the magnetic poles and connecting them with bolts, or two combined connection methods can be adopted. The two ends of the casing are respectively provided with end covers, and the rotating shaft of the motor is supported in the center of the end covers through bearings.

The stator core is wound from amorphous alloy strips. The teeth of the stator core are divided into two parts: the inner teeth 10 and the outer teeth 9, and there is an auxiliary slot between the inner teeth 10 and the outer teeth 9. 13. The auxiliary slot 13 corresponds to the circumferential position of the magnetic isolation region 3 of the rotor. A radial slot 14 is formed between the teeth of the adjacent stator cores. The DC excitation winding 8 is wound on the outer teeth 9 through the radial slot 14 and the auxiliary slot 13. , the DC excitation winding 8 is not in contact with the adjacent outer teeth 9 and the inner inner teeth 10 . The stator armature winding 7 surrounds each of the stator teeth 11 composed of the inner teeth 9 and the outer teeth 10 , forming a structure in which the teeth 11 of the amorphous alloy stator core are set with two windings. The DC excitation winding 8 is located on the outer circumference of the outer teeth 9 and surrounded by the stator armature winding 7 on three sides. A first insulator 15 is arranged between the DC excitation winding 8 and the outer teeth 9, and a second insulator is arranged in the auxiliary slot. The insulator 16 is used for isolating the DC excitation winding 8 and the inner teeth 10 , a fourth insulator 17 is arranged between the DC excitation winding 8 and the stator armature winding 7 , and a fourth insulator 17 is arranged between the stator armature winding 7 and the inner teeth 10 There is a third insulator 18 . The second insulator 16 is air or insulating paper. Preferably, in the case of satisfying safety and reliability, in order to reduce costs, air is selected as the insulating medium of the second insulator 16 . The first insulator 15 , the third insulator 18 and the fourth insulator 17 are all insulating papers, and their materials are the same. The outer tooth portion 9 and the inner tooth portion 10 are roughly fan-shaped, their respective sides far from the rotor center are arcs with their centers in the rotor center, and their respective sides close to the rotor center are straight lines or arcs roughly pointing to the rotor center. The remaining two edges are straight, and smooth chamfers are set at the vertices to avoid scratching the winding wire. The rotor adopts a double-disc structure with soft magnetic poles on the inner and outer circumferences. The rotor yoke 1 is attached with soft magnetic poles 2 on the surface close to the stator side and the outer teeth 9 of the stator iron core. The surface of the rotor yoke 1 is close to the stator side. The permanent magnet 4 and the soft magnetic pole 5 in contact with each other are attached to the position facing the part 10 , and the position of the rotor yoke 1 on the surface close to the stator side corresponding to the auxiliary slot 13 of the stator core is the magnetic isolation area 3 . The permanent magnet 4 is located between the first soft magnetic pole 5 and the second soft magnetic pole 2, and is alternately distributed in polarity in the circumferential direction. The first soft magnetic pole 5 and the second soft magnetic pole 2 use ferromagnetic materials, and the first soft magnetic pole 5. The numbers of the second soft magnetic poles 2 and the permanent magnets 4 are equal, which is equal to the number of poles of the motor. Adopting this structure is beneficial to reduce the eddy current loss on the permanent magnet, and at the same time, it is also beneficial to save the amount of the permanent magnet, reduce the cost, and improve the performance of the motor.

The manufacturing method of the amorphous alloy stator core of the above-mentioned composite amorphous alloy axial flux motor:

Select the width of the amorphous alloy strip according to the required axial size of the stator core, and then wind the amorphous alloy strip on the mold with the inner diameter according to the inner diameter and outer diameter of the stator core, and subtract the inner diameter from the outer diameter. After the layers are tightly laminated, annealing, varnishing, shaping and curing are carried out. After curing, the left and right end faces of the stator core are cut radial grooves by laser cutting, EDM cutting or water jet cutting to form stator teeth. The stator teeth are then cut again along the circumference to generate auxiliary slots to form a stator core with inner and outer circumferential teeth.

The working process of the present invention is as follows:

The stator is made of amorphous alloy strip, and then the left and right parts of the stator core are slotted respectively. After the slot is completed, an auxiliary slot is opened along the circumferential direction on the teeth of the stator core on the left and right sides. Each stator tooth is divided into two parts, and then a soft magnetic pole is placed on the rotor position corresponding to the outer stator tooth, and a permanent magnet and a soft magnetic pole are placed on the rotor position corresponding to the inner stator tooth. The DC excitation winding is wound, and the armature winding is wound on the entire stator tooth. The three-phase sinusoidal alternating current is applied to the armature winding respectively, and the direct current is applied to the DC excitation winding, and then the soft magnetic pole at the corresponding position of the rotor is magnetized, so that the soft magnetic pole on the rotor and the permanent magnet work together to generate a synthetic magnetic field. The magnetic field is closed by the amorphous alloy stator core, and under the action of the electromagnetic field, the motor rotor rotates under the support of the bearing to output mechanical energy. Since the present invention proposes a composite amorphous alloy axial magnetic flux motor structure, the air gap magnetic field can be changed by adjusting the magnitude of the excitation current, thereby improving the rotational speed and driving performance of the motor.

Conclusion: The composite amorphous alloy axial flux motor of the present invention can not only inherit the characteristics of high power density, high torque density and high efficiency of the axial flux permanent magnet motor, but also has the characteristics of electric excitation motor. There are many advantages such as smooth and adjustable gap magnetic field.

Claims (10)

1. a composite type amorphous alloy axial flux motor, comprising stator, casing, end cover, rotating shaft, bearing and rotor, it is characterized in that: stator core is amorphous alloy stator core, and stator core comprises stator yoke and stator There are two parts of teeth. The stator teeth are composed of inner teeth and multiple outer teeth. The multiple inner teeth and outer teeth are evenly distributed on the stator yoke. The inner side of each outer teeth has An inner tooth part, the stator core is embedded in the casing, the DC excitation winding is wound on the outer tooth part, and a first insulator is arranged between the DC excitation winding and the outer tooth part, each outer tooth part and its inner tooth The whole part is also wound with an armature winding. A fourth insulator is arranged between the armature winding and the DC excitation winding inside. The rotor is assembled on the rotating shaft. The rotor includes a rotor yoke, a rotor bracket, a second soft magnetic pole, a permanent magnet and a first soft magnetic pole. The magnetic poles, the second soft magnetic poles, the permanent magnets and the first soft magnetic poles are uniformly installed on the side of the rotor yoke close to the stator, and there is a permanent magnet on the inner side of each second soft magnetic pole, and a permanent magnet on the inner side of each permanent magnet. The first soft magnetic pole, the permanent magnet and the first soft magnetic pole are in contact with each other, the permanent magnet and the first soft magnetic pole correspond to the circumferential position of the inner tooth portion, the second soft magnetic pole corresponds to the circumferential position of the outer tooth portion, and the second soft magnetic pole corresponds to the circumferential position of the outer tooth portion. The soft magnetic pole is separated from the permanent magnet on the inner side in the circumferential direction by the magnetic isolation area, end covers are respectively provided at both ends of the casing, and the rotating shaft of the motor is supported in the center of the end covers through bearings. 2 . The composite amorphous alloy axial flux motor according to claim 1 , wherein the stator teeth are located on both sides of the stator yoke, both sides of the stator core are provided with rotors, and the rotor yoke adopts a soft yoke. 3 . Magnetic material, the positions of the permanent magnets of the rotors on both sides are opposite and the polarities are different, forming an axial flux motor with a single-stator double-rotor structure. The armature winding and the DC excitation winding are arranged in a ring on the radial plane. , and non-overlapping, the two sets of armature windings and the two sets of DC excitation windings are completely symmetrical in the axial direction. 3 . The composite amorphous alloy axial flux motor according to claim 1 , wherein the stator core is formed by winding amorphous alloy strips, and the teeth of the stator core are divided into inner teeth and There are two parts of the outer teeth, and there is an auxiliary slot between the inner teeth and the outer teeth. The auxiliary slot corresponds to the circumferential position of the magnetic isolation area of the rotor. A radial slot is formed between the teeth of the adjacent stator cores. The excitation winding is wound on the outer teeth through radial slots and auxiliary slots, and the DC excitation winding is not in contact with the inner sides of the adjacent outer teeth and inner teeth. 4 . The composite amorphous alloy axial flux motor according to claim 1 , wherein the DC excitation winding is located on the outer circumference of the outer tooth portion and surrounded by armature windings on three sides, and the DC excitation winding is connected to the outer tooth portion. 5 . A first insulator is arranged between the outer teeth, a second insulator is arranged in the auxiliary slot, a fourth insulator is arranged between the DC excitation winding and the armature winding, and a second insulator is arranged between the armature winding and the inner tooth. Three insulators. 5 . The composite amorphous alloy axial flux motor according to claim 4 , wherein the second insulator is air or insulating paper. 6 . 6 . The composite amorphous alloy axial flux motor according to claim 4 , wherein the first insulator, the third insulator and the fourth insulator are all insulating paper. 7 . 7 . The composite amorphous alloy axial flux motor according to claim 4 , wherein the outer tooth portion and the inner tooth portion are sector-shaped, and their respective edges away from the center of the rotor are those with the center of the circle at the center of the rotor. 8 . Circular arcs, whose respective sides close to the rotor center are straight lines or arcs roughly pointing to the rotor center, and the other two sides are straight lines, and smooth chamfers are set at the apex to avoid scratching the winding wire. 8 . The composite amorphous alloy axial flux motor according to claim 1 , wherein the rotor adopts a double-disc structure whose inner and outer circumferences are soft magnetic poles, and the rotor yoke is on the surface close to the stator side and outside the stator core. 9 . The second soft magnetic pole is attached to the position corresponding to the teeth, the permanent magnet and the first soft magnetic pole are attached to the rotor yoke on the surface close to the stator side and the inner teeth are in contact with each other, and the rotor yoke is attached to the surface close to the stator side. The position directly corresponding to the auxiliary slot of the stator core is the magnetic isolation area. 9 . The composite amorphous alloy axial flux motor according to claim 1 , wherein the permanent magnet is located between the first soft magnetic pole and the second soft magnetic pole, and has alternating polarities in the circumferential direction. 10 . distribution, the first soft magnetic pole and the second soft magnetic pole are made of ferromagnetic material, and the number of the first soft magnetic pole, the second soft magnetic pole and the permanent magnet is equal, which is equal to the number of poles of the motor. 10. A method for manufacturing an amorphous alloy stator core of a composite amorphous alloy axial flux motor as claimed in claim 1, wherein: Select the width of the amorphous alloy strip according to the required axial size of the stator core, and then wind the amorphous alloy strip on the mold with the inner diameter according to the inner diameter and outer diameter of the stator core, and subtract the inner diameter from the outer diameter. After the layers are tightly laminated, annealing, varnishing, shaping and curing are carried out. After curing, the left and right end faces of the stator core are cut radial grooves by laser cutting, EDM cutting or water jet cutting to form stator teeth. The stator teeth are then cut again along the circumference to generate auxiliary slots to form a stator core with inner and outer circumferential teeth.

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