CN102624183A - Axial magnetic field permanent magnet brushless motor and assembly method - Google Patents

Abstract

The invention discloses a permanent-magnet axial-magnetic-field brushless motor, which comprises a stator, a rotor, a lower end cap and an upper end cap, wherein the rotor is arranged at the center of the stator. The permanent-magnet axial-magnetic-field brushless motor is characterized in that the stator comprises a plurality of stator C-shaped iron cores and winding coils arranged on the iron cores; the rotor comprises a non-magnet-conductive rotor plate, a plurality of permanent magnets and a rotary shaft, the rotary shaft is arranged at the center of the non-magnet-conductive rotor plate, the permanent magnets are uniformly embedded on the circumference of the non-magnet-conductive rotor plate, the stator C-shaped iron cores are embedded in slots of the upper end cap and the lower end cap and circularly distributed on the circumference of the non-magnet-conductive rotor plate uniformly, and upper magnetic pole surfaces of the stator C-shaped iron cores correspond to the permanent magnets of the non-magnet-conductive rotor plate. The invention further discloses an assembling method of the motor. The permanent-magnet axial-magnetic-field brushless motor and the assembling method thereof have the advantages that electric load and magnetic load are set independently, the stator lamination iron cores are simple in manufacture, and coil magnetic loops formed by the stator windings are independent to each other. Besides, design difficulty of the motor is beneficially reduced, and manufacturing cost of the motor is reduced while performance of the motor is improved.

Description

Axial magnetic field permanent magnet brushless motor and assembly method

technical field

The invention relates to a motor, in particular to an axial magnetic field permanent magnet brushless motor whose electric load and magnetic load can be set independently and an assembly method.

Background technique

At present, the motor is a device that converts energy between electric energy and mechanical energy through electromagnetic induction. The electric load and magnetic load of the motor are one of the two most important parameters in the motor. Their size not only affects the economy of the motor, but also affects its performance. . At present, the selection of electromagnetic loads of general motors is mutually restricted, which undoubtedly reduces the selection space of electric and magnetic loads of motors, and affects the optimization of motor economy and performance.

The axial field permanent magnet brushless motor has the comprehensive performance advantages of the axial field motor and the permanent magnet motor, and has the performance characteristics of high efficiency, high torque density, high power density, high power factor and high torque/moment of inertia and short Disc-shaped structural features. The fractional-slot centralized winding structure with a coil set in each tooth has great advantages in the axial magnetic field permanent magnet brushless motor whose inner winding space is much smaller than the outer winding space, which not only reduces the winding end, but also reduces the resistance of the motor And copper consumption and copper consumption, reduce the thickness of the iron core of the motor yoke, and the selection of the electric load of the motor is not limited by the internal space, which is beneficial to the performance optimization of the motor. Moreover, since there is only one coil on each tooth, that is When a coil fails, only the coil can be replaced, but the magnetic circuits of each coil are still coupled to each other, so this kind of motor only has a certain fault tolerance. Single stator disk double rotor disk axial field permanent magnet brushless motor (rotor disk on both sides, middle stator disk) and double stator disk single rotor disk axial field permanent magnet brushless motor (both stator disks, middle rotor disk) to reduce motor cogging Torque ripple and elimination of axial magnetic pull are of great importance. All these methods improve the performance of the axial magnetic field permanent magnet brushless motor and expand the application of the motor.

However, the current general-purpose axial magnetic field permanent magnet brushless motor also has the following defects: (1) The selection of the electric and magnetic loads of the motor is mutually restricted, which brings difficulties to the design, economy and performance optimization of the motor; (2) The manufacturing process of the laminated iron core is complicated; (3) The coil magnetic circuit composed of each winding is not independent, so the fault tolerance of the motor is low.

At present, the transverse flux permanent magnet motor is the only motor that can independently set the electric load and magnetic load. This kind of motor can be an ordinary radial magnetic field permanent magnet brushless motor or an axial magnetic field permanent magnet Brushless Motor. When the transverse flux pattern is applied to the axial magnetic field permanent magnet brushless motor, an axial magnetic field permanent magnet brushless motor with independent electric and magnetic loads is obtained. However, the large magnetic flux leakage of transverse flux motors, the extremely complex stator core and rotor magnet structure make it difficult to be practically applied, especially the transverse flux axial magnetic field permanent magnet brushless motor, not only has not been applied but is rarely used involves.

Contents of the invention

The purpose of the present invention is to overcome above-mentioned deficiencies in the prior art, provide a kind of axial magnetic field permanent magnet brushless motor of new structure and principle and assembly method, it has electric and magnetic load independent setting, stator laminated iron core is made simple and The advantages of independent magnetic circuits of the coils of the stator winding are beneficial to reduce the design difficulty of the motor, reduce the manufacturing cost of the motor, and improve the performance of the motor.

To achieve the above object, the present invention adopts the following technical solutions:

An axial magnetic field permanent magnet brushless motor, including a stator, a rotor, a lower end cover and an upper end cover, the rotor is located at the center of the stator, the stator includes a plurality of stator C-shaped iron cores and winding coils arranged thereon; the rotor includes a magnetically conductive rotor disc, permanent magnet and rotating shaft, a rotating shaft is installed in the center of the non-conductive rotor disc, several pieces of permanent magnets are uniformly embedded in the periphery of the non-magnetic rotor disc, and several stator C-shaped cores are embedded in the grooves of the upper and lower end covers; The stator C-shaped core is evenly distributed around the circumference of the non-magnetic rotor disk, and the upper and magnetic pole surfaces of the stator C-shaped core correspond to the permanent magnets of the non-magnetic rotor disk to ensure that the coil on the stator C-shaped core is energized. The magnetic field is exactly aligned with the magnetic field generated by the permanent magnets of the rotor.

The stator C-shaped iron core is formed by stacking laminated iron cores, or made of a whole piece of magnetically conductive material; when the laminated iron core is used, the cross-sectional shapes of the stator C-shaped iron cores are the same as rectangles, and the cross-sectional areas are the same; When the whole piece of magnetic material is used, the cross-sectional shape and cross-sectional area of the stator C-shaped core are different;

Each stator C-shaped core is divided into 5 parts according to different functions and positions, that is, the opposite side of the C-shaped opening is the pole body, the upper and lower parts of the stator C-shaped core are the upper pole yoke and the lower pole yoke respectively, and the upper and lower poles of the C-shaped opening are The two parts are an upper magnetic pole and a lower magnetic pole, and both the lower magnetic pole surface and the upper magnetic pole surface are opposite to the non-magnetic rotor disk.

There is a winding coil on each stator C-shaped core, or a winding coil is placed between a stator C-shaped core, and the winding coil is placed at the pole position of the stator C-shaped core, or a stator C-shaped core is placed on a The winding coil is divided into two parts, which are respectively placed on the upper and lower magnetic poles of the C-shaped core of the stator; all the winding coils are connected in series or in parallel to form the m-phase symmetrical winding of the stator, and m is a natural number.

The winding coil on the stator C-shaped core is a formed coil or a non-formed coil; if a formed coil is placed on each stator C-shaped core, then when the stator C-shaped core is made, the stator C-shaped core is divided into two parts, and then Put the formed coil into the pole of the stator C-shaped core, and then shape the two parts of the core into the stator C-shaped core; If the winding coils are respectively placed on the upper and lower magnetic poles of the stator C-shaped core, no matter whether a formed coil or a non-formed coil is used, the overall stator C-shaped core is made.

The non-magnetic rotor disc of the rotor is disc-shaped, and several slots are uniformly opened on the same circumference, and permanent magnets magnetized along the axial direction and polarized in a staggered arrangement are placed in the slots to form the motor rotor permanent magnet poles.

The center line of the permanent magnet of the rotor is aligned with the center line of the upper and lower magnetic poles of the stator C-shaped iron core.

The number of stator C-shaped core pieces, the number of stator winding phases m and the number of rotor magnets satisfy the relationship among the number of stator slots, winding phases and poles of a conventional motor.

The upper end cover and the lower end cover are exactly the same, and the center of the disc part of the upper and lower end covers is placed with the bearing connected to the rotor shaft, and the cylindrical part of the upper and lower end covers is evenly opened on the side to connect with the C-shaped iron core of the stator. The slots of the same size as the lower pole yoke are used to install and fix the upper and lower pole yokes of the stator C-shaped core on the upper and lower end covers.

An assembly method of an axial magnetic field permanent magnet brushless motor. First, several winding coils are respectively placed on several stator C-shaped iron cores, and several permanent magnets are installed on the non-magnetic rotor of the rotor in an alternate arrangement of N and S. Then install the motor shaft on the non-magnetic rotor disk;

Then install the lower end cover of the motor to one end of the motor shaft, so that the relative position of the lower end cover of the motor and the non-magnetic rotor disk of the motor is fixed;

Then install the lower pole yokes of all stator C-shaped iron cores into the evenly distributed grooves on the side of the lower end cover;

Install the upper end cover to the other end of the motor shaft. The evenly distributed slots on the side of the upper end cover just fit into the upper pole yoke of the C-shaped core of the stator. Finally, place a casing as required to fix the upper and lower end covers together.

The size of the motor torque ripple is related to the number of rotor poles 2p of the motor, the number of stator C-shaped core blocks Ns and the number of phases m. The larger 2p, Ns, and m (p, Ns, and m are all natural numbers), the torque ripple of the motor will The smaller, so the motor of the present invention can increase the number of permanent magnet poles 2p, the number of stator C-shaped core blocks Ns and the number of phases by increasing the diameter of the motor rotor disc while keeping the size of the permanent magnet and the stator C-shaped iron core constant. The purpose of m, thereby reducing the torque ripple of the motor.

The electrical load and magnetic load of the motor have a great influence on the performance of the motor. In an ordinary motor, the area of the slot where the coil is placed is related to the electrical load of the motor. The larger the slot area, the greater the electrical load. The tooth area is related to the magnetic load. The larger the tooth area, the greater the magnetic load. Obviously, the groove area and the tooth area are mutually restricted, so the electric and magnetic loads are mutually restricted, and one must be large and the other must be small. In the motor of the present invention, the window area for placing the coils can be arbitrarily increased or reduced, which has nothing to do with the cross-sectional area of the upper and lower poles of the C-shaped iron core. Therefore, the electric and magnetic loads of the motor of the present invention have no restrictive relationship and can be set independently, which has great impact on motor design and optimization. The design brings great convenience.

The magnetic circuit of the iron core of the motor is different from that of the common motor. The magnetic circuit of the motor in the present invention is only a C-shaped iron core, and the magnetic circuit of the iron core is very short, so the core loss of the motor is very low.

It can be seen that the magnetic circuits of each coil are not connected magnetically. If the connection between each phase of each coil is not considered to be electrically independent from each other, the motor has a strong fault tolerance. If one of the phases of the motor fails, This phase can be cut off, and the other phases can work normally. By increasing the number of phases of the motor, it is ensured that the performance of the motor will not be greatly affected after one phase is cut off, so the motor of the present invention has strong fault tolerance. If one coil of the motor is short-circuited or the insulation fails, only the coil can be replaced without affecting other coils, which is beneficial to the maintenance of the motor.

If the common disk motor stator core adopts laminated core, it must have a special manufacturing process. The manufacture of the motor stator core is extremely simple and the cost is low. The motor coils of the present invention are all the same, easy to manufacture, and may or may not be formed coils.

This motor is the same as the ordinary dual-stator disk single-rotor disk axial magnetic field permanent magnet motor. The main material of the rotor disk is non-magnetic material, which can be made of aluminum, which reduces the quality and moment of inertia of the motor. The method of evenly opening the holes further reduces the mass and moment of inertia of the motor rotor disk.

The working principle of the present invention is: the motor of the present invention can be used as a sine wave permanent magnet brushless motor. At this time, the m-phase symmetrical winding of the stator 2p pole composed of Ns or Ns/2 coils is passed into the m-phase symmetrical alternating current, and it will A 2p pole rotating magnetic field is generated between the rotor disk of the motor and the pole surface of the stator C-shaped core, and the 2p pole magnet of the rotor will also generate a rotating magnetic field with the same number of poles, the same rotation direction and the same rotation speed as the magnetic field, and the two magnetic fields interact Just can carry out energy transformation, when electric energy becomes mechanical energy, motor of the present invention is used as motor, and when mechanical energy becomes electric energy, motor of the present invention is used as generator. The motor of the present invention can also be used as a square-wave permanent magnet brushless motor. At this time, the m-phase current is a symmetrical 120° square wave current, and the m-phase symmetrical winding produces a trapezoid with a flat top width of 120° under the action of the rotor permanent magnet magnetic field Wave permanent magnet electromotive force, this square wave current interacts with trapezoidal wave electromotive force to generate electromagnetic power for energy conversion.

The beneficial effects of the present invention are:

(1) The magnetic field of the motor is composed of stator C-shaped iron core, two air gaps and the thickness of the rotor disk, which has nothing to do with the diameter of the rotor. Therefore, the number of motor poles, the number of stator C-shaped iron cores or the number of phases can be increased by increasing the outer diameter of the rotor disk, which is beneficial Reduce the cogging torque ripple of the motor;

(2) The core magnetic circuit only includes the stator C-shaped core with a very short path, which has very low iron loss;

(3) The torque is the product of the electromagnetic force and the radius. Therefore, under the premise that other structural dimensions remain unchanged, the torque of the motor can be increased only by increasing the diameter of the rotor disc; at the same time, the selection of the electric load has nothing to do with the magnetic load. The motor torque, power and copper loss can be increased by increasing the conductor wire gauge without affecting the magnetic circuit;

(4) All stator C-type cores are magnetically independent, and electrically, if the connection between each phase is not considered, they are also independent of each other, so the motor has a strong fault tolerance;

(5) All stator C-shaped cores and coils are the same, and the production is simple; especially, as the working principle of the axial magnetic field motor, it does not need the complicated lamination core manufacturing process of the usual disc motor;

(6) The material of the rotor disk is a non-magnetic material, which can be made of aluminum, which reduces the quality and moment of inertia of the motor, and can further reduce the quality and moment of inertia of the motor by digging holes evenly on the rotor disk.

Description of drawings

Fig. 1 is a schematic diagram of a 3-phase, 12-stator, C-core, 10-rotor permanent magnet pole motor;

Figure 2 is a structural diagram of 12 stator C-shaped cores and 12 coils;

Figure 3 is a schematic diagram of the overall rotor;

Figure 4 is a schematic diagram of the stator C-shaped core;

Figure 5 is a schematic diagram of the components of the stator C-shaped core;

Fig. 6 is a schematic diagram of a stator C-shaped iron core composed of laminated iron cores;

Fig. 7 is a schematic diagram of the stator C-shaped iron core and a stator coil on it;

Fig. 8 is a schematic diagram of the stator C-shaped iron core and two coils thereon;

Fig. 9 is the rotor non-conductive disk and the permanent magnet on it;

Figure 10 is a structural diagram of the end cap;

Figure 11 is an assembly drawing of the integral rotor disc and the lower end cover;

In the figure, 1 is the C-shaped iron core of the stator, 2 is the winding coil, 3 is the lower end cover, 4 is the upper end cover, 5 is the non-conductive disk of the rotor, 6 is the permanent magnet of the rotor, 7 is the rotating shaft, 11 is the pole body, and 12 is the lower end cover. Pole yoke, 13 is an upper pole yoke, 14 is a lower magnetic pole (lower pole), 15 is an upper magnetic pole (upper pole), 21 is a lower coil, and 22 is an upper coil.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

A new type of axial magnetic field permanent magnet brushless motor, which is composed of a stator and a rotor. The stator is composed of Ns stator C-shaped cores 1 and the winding coils 2 on it, the lower end cover 3 and the upper end cover 4; the rotor is composed of a non-magnetic rotor. Disk 5, permanent magnet 6 and rotating shaft 7 constitute. Fig. 1 is a schematic diagram of the motor structure of the present invention with 3 phases, 12 stator C-shaped iron cores, and 10 rotor permanent magnet poles. For the sake of convenience, only the lower end cover 3 of the motor is buckled together with the stator C-shaped iron core 1, and the upper end cover 4 of the motor is not buckled. On the stator C-shaped core of the motor. Figure 2 is a schematic diagram of the position and structure of the 12 stator C-shaped cores of the motor and their upper coils, and Figure 3 is a schematic diagram of the overall rotor disk.

The stator C-shaped core 1 is shown in Figure 4. The stator C-shaped core 1 is divided into pole body 11, lower pole yoke 12, upper pole yoke 13, lower magnetic pole (referred to as lower pole) 14 and The upper magnetic pole (abbreviated as the upper pole) 15 is shown in FIG. 5 . The stator C-shaped iron core 1 can be formed by lamination of laminated magnetically permeable cores, as shown in FIG. If it is made of laminated cores, the cross-sectional shape of each part of the stator C-shaped core is the same, all of which are rectangular, and the cross-sectional area is the same; The same shape and the same cross-sectional area, the lower pole 14 and the upper pole 15 have the same cross-sectional shape and the same cross-sectional area, but they can have different cross-sectional shapes and cross-sectional areas from the fuselage 11 .

The winding coils 2 are generally placed on the poles of the C-shaped iron core of the stator, as shown in FIG. 7 . A winding coil 2 in Fig. 7 can be equally divided into two coils (i.e. upper coil 22 and lower coil 21) and placed on the lower pole 14 and upper pole 15 of the stator C-shaped iron core respectively, as shown in Fig. 8, in Fig. 7 The one coil of and the two coils in Figure 8 have exactly the same effect. The winding coil 2 may be a formed coil or not. If a formed coil is used, and a stator C-shaped core is covered with a coil, then when the stator C-shaped core is made, the stator C-shaped core is cut into two parts, namely A pole yoke and a magnetic pole are made into one body, and the two outer parts of the stator C-shaped core are made into one body, so that the formed coil is first put on the pole body, and then the stator C-shaped core is connected and formed; if the formed coil is used, a stator Put two equally divided coils on the C-shaped core, then directly make the stator C-shaped core and two equally divided forming coils, and put the two equally divided forming coils on the two poles of the stator C-shaped core; if using For non-formed coils, no matter there is one coil or two equally divided coils on a stator C-shaped core, the stator C-shaped core is made, and then the coil is embedded and wound on the core.

The following will be described with a coil shown in FIG. 7 .

The main part of the motor stator is composed of all Ns stator C-shaped cores 1 and the winding coils 2 on them. As shown in Figure 2, there are 12 stator C-shaped cores 1 and 12 winding coils 2 on them. The m-phase symmetrical winding corresponding to the rotor permanent magnet pole number 2p is formed in series or in parallel, and the number of stator C-shaped iron cores is Ns, the number of rotor magnetic poles is 2p, and the number of stator phases m meets the stator slot in the usual permanent magnet brushless motor. Number, number of poles and the relationship between the number of phases. Since usually double-layer windings or single-layer windings can be used in the stator slot of the motor, the winding coils 2 can be placed at intervals in the stator C-shaped iron core of the present invention, that is to say, Ns stator C-shaped iron cores only have Ns/2 windings Coil 2. Figure 2 shows 12 stator C-shaped cores, each stator C-shaped core is placed with a winding coil 2, a total of 12 winding coils 2, 12 winding coils 2 correspond to 10 permanent magnet poles of the rotor, according to the winding arrangement of the usual motor Form 3-phase symmetrical windings; in Figure 2, a winding coil 2 can be placed at intervals of a stator C-shaped core, so there are only 6 winding coils 2, and these 6 winding coils 2 are connected to each other to form a 3-phase symmetrical winding corresponding to 10 rotor permanent magnet poles .

The rotor is made up of rotor non-conductive disk 5, permanent magnet 6 and rotating shaft. Evenly open even slots on the periphery of the non-conductive disk 5 to place the permanent magnets 6 as permanent magnet poles. The permanent magnets are magnetized along the axial direction, and the polarities of the magnetic poles are arranged alternately. As shown in FIG. The overall disk of the rotor with 10 permanent magnet poles is shown in Figure 3. Since the entire rotor disk needs to be placed inside all the stator C-shaped cores 1, and the permanent magnets 6 are aligned with the pole faces of the lower pole 12 and the upper pole 13 of the stator C-shaped core 1, when making the permanent magnet slots of the rotor disk, The position of the slot needs to be guaranteed.

Figure 10 shows the shape of the end cover. The lower end cover 3 is exactly the same as the upper end cover 4. A hole is opened in the center of the disk on one side for fixing with the rotating shaft 7. The ring on the other side is evenly slotted to fix the stator C Insert the pole yoke of C-shaped core 1 into this slot to position and fix the stator C-shaped core 1 (the lower pole yoke of the stator C-shaped core is inserted into the corresponding slot of the lower end cover, and the upper pole yoke of the stator C-shaped core is inserted into the corresponding slot of the upper end cover) . The end cover in Fig. 10 is used in 12 stator C-type iron core motors, so there are 12 slots evenly opened on the ring side of the end cover with the same size as the stator C-type iron core pole yoke.

When assembling the motor, first place Ns winding coils 2 on Ns stator C-shaped cores 1 respectively, or place Ns/2 winding coils 2 on Ns stator C-shaped cores 1 at intervals, and at the same time place 2p blocks permanently The magnets 6 are mounted on the rotor non-conductive disk 5 in an alternate arrangement of N and S, and then the motor shaft 7 is mounted on the rotor non-conductive disk 5 . Then the lower end cover 3 of the motor is installed on one end of the motor shaft 7, so that the relative position of the lower end cover 3 of the motor and the non-conductive disk 5 of the motor rotor is fixed. Then install the lower pole yokes 12 of all the stator C-shaped iron cores 1 into the evenly distributed grooves on the side of the lower end cover 3 . Then the upper end cover 4 is installed on the other end of the motor shaft 7, the evenly distributed grooves on the side of the upper end cover 4 are just stuck on the upper pole yoke 13 of the stator C-shaped iron core 1, and finally, a casing can be placed as required, and the upper and lower two The end caps are fastened together.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (10)

1. an axial magnetic field permanent magnet brushless electric machine comprises stator, rotor, bottom end cover and upper end cover, and rotor is positioned at stator center, it is characterized in that, stator comprises several stators C sections heart and winding coil provided thereon; Rotor comprises not magnetic conduction rotor disk, permanent magnet and rotating shaft, and rotating shaft is not equipped with at magnetic conduction rotor disk center, and magnetic conduction rotor disk circumferential edge evenly is not embedded with some permanent magnets, and several stators C sections heart is embedded in the groove of upper and lower end cap; Some stator C sections heart uniform ring are around being distributed in not magnetic conduction rotor disk circumference, and the going up of the stator C sections heart, magnetic pole strength are corresponding with the permanent magnet of magnetic conduction rotor disk not.

2. axial magnetic field permanent magnet brushless electric machine as claimed in claim 1 is characterized in that, the said stator C sections heart adopts laminated core to be overrided to form, and perhaps adopts the monoblock permeability magnetic material to constitute; When adopting laminated core, cross sectional shape is identical everywhere all is rectangle for the stator C sections heart, and sectional area is all identical; When adopting the monoblock permeability magnetic material, stator C sections heart cross sectional shape and sectional area everywhere is inequality.

3. according to claim 1 or claim 2 axial magnetic field permanent magnet brushless electric machine; It is characterized in that; Said each stator C sections heart is according to different 5 parts that are divided into the position of effect; The opposite that is C type opening is that two parts up and down of pole body, the stator C sections heart are respectively down utmost point yoke and last utmost point yoke, and C type opening part two parts up and down is lower magnetic pole and last magnetic pole, and all with not the magnetic conduction rotor disk is relative for lower magnetic pole face and last magnetic pole strength.

4. axial magnetic field permanent magnet brushless electric machine as claimed in claim 3; It is characterized in that; Said each stator C sections all has a winding coil in the heart, and perhaps a stator C sections heart is placed a winding coil at interval, and winding coil is positioned over the pole body position of the stator C sections heart; Perhaps a stator C sections winding coil in the heart is divided into two parts, is positioned over respectively on the last lower magnetic pole of the stator C sections heart; The symmetrical winding of m of all winding coils composition stator in series or in parallel with each other, m is a natural number.

5. axial magnetic field permanent magnet brushless electric machine as claimed in claim 4 is characterized in that, said stator C sections winding coil in the heart is formed coil or non-formed coil; If each stator C sections is placed a formed coil in the heart, then when making the stator C sections heart,, behind the pole body that formed coil is inserted in the stator C sections heart, again two parts iron core is shaped to the stator C sections heart with stator C sections heart separated into two parts; When adopting non-formed coil, then directly make the one-piece stator C sections heart, with non-formed coil embedding on the pole body of the stator C sections heart; If place winding coil respectively on the last lower magnetic pole of the stator C sections heart, then no matter adopting formed coil also is non-formed coil, all is to make the one-piece stator C sections heart.

6. axial magnetic field permanent magnet brushless electric machine as claimed in claim 5; It is characterized in that; The not magnetic conduction rotor disk of said rotor is a disc; On its same circumference, evenly open several trough, the permanent magnet that placement is magnetized vertically in the said several trough, polarity is arranged is formed the rotor permanent magnetism magnetic pole.

7. axial magnetic field permanent magnet brushless electric machine as claimed in claim 6 is characterized in that, said rotor permanent magnet center line and stator C sections are in the heart, the lower magnetic pole position of center line aligns.

8. axial magnetic field permanent magnet brushless electric machine as claimed in claim 7 is characterized in that, said stator C sections heart piece number, stator winding number of phases m and rotor magnet number satisfy the relation between conventional motor stator slot number, the winding number of phases and the number of poles.

9. axial magnetic field permanent magnet brushless electric machine as claimed in claim 1; It is characterized in that; Described upper end cover and bottom end cover are identical; The integrated disc portions center of upper and lower end cap is placed the bearing that joins with armature spindle is installed, and the cylindrical portions may of upper and lower end cap is evenly left the groove with the upper and lower utmost point yoke of stator C sections heart same size at side, covers in order to the upper and lower utmost point yoke of the stator C sections heart is mounted on upper and lower end.

10. the assembly method of each described axial magnetic field permanent magnet brushless electric machine of claim 1-9 is characterized in that step is following:

At first some winding coils are positioned over some stator C sections respectively in the heart, the mode of simultaneously some permanent magnets alternately being arranged according to N, S installs to rotor not on the magnetic conduction rotor disk, machine shaft is installed to not on the magnetic conduction rotor disk again;

Then the bottom end cover of motor is installed to an end of machine shaft, like this motor bottom end cover and motor not the relative position of magnetic conduction rotor disk fix;

Following utmost point yoke with all stator C sections hearts is installed in the equally distributed groove in bottom end cover side again;

Upper end cover is installed to the other end of machine shaft, and the equally distributed groove in upper end cover side just in time is stuck in the last utmost point yoke of the stator C sections heart, and is last, places a casing as required, and two end caps are fixed together up and down.

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