阅读说明：本技术 一种具有海尔贝克阵列的直流无刷内转子电机 (Direct-current brushless inner rotor motor with Halbach array ) 是由 左宜 计佰强 于 2021-08-02 设计创作，主要内容包括：本发明公开了一种具有海尔贝克阵列的直流无刷内转子电机,其特征是,包括定子、转子、转轴,所述转子设置在定子内部与定子同轴设置,所述定子由定子齿、定子槽和缠绕在定子齿上的绕组组成,转子铁芯外周面表贴有若干钕铁硼永磁磁钢,所述若干钕铁硼永磁磁钢呈海尔贝克阵列分布。转子铁芯表贴表钕铁硼永磁磁钢,并且钕铁硼永磁磁钢采用海尔贝克阵列排布,有效提高电机功率密度和永磁体利用率。钕铁硼永磁磁钢每极槽数为不可约的真分数,减小虚拟单元电机数目,从而达到降低电机脉动的效果。钕铁硼永磁磁钢外表面设有碳纤维磁钢固定层,对高速运转中的磁钢离心力有冲抵作用,提高电机稳定性和使用寿命。(The invention discloses a direct-current brushless inner rotor motor with a Halbach array, which is characterized by comprising a stator, a rotor and a rotating shaft, wherein the rotor is arranged inside the stator and is coaxial with the stator, the stator consists of stator teeth, stator slots and windings wound on the stator teeth, a plurality of neodymium iron boron permanent magnet steels are pasted on the outer peripheral surface of a rotor iron core, and the neodymium iron boron permanent magnet steels are distributed in the Halbach array. The surface of the rotor core is pasted with the surface neodymium iron boron permanent magnet steel, and the neodymium iron boron permanent magnet steel is arranged in a Halbach array, so that the power density of the motor and the utilization rate of the permanent magnet are effectively improved. The number of each pole slot of the neodymium iron boron permanent magnet steel is irreducible, so that the number of virtual unit motors is reduced, and the effect of reducing motor pulsation is achieved. The outer surface of the neodymium iron boron permanent magnet steel is provided with a carbon fiber steel fixing layer which has an impact effect on the centrifugal force of the steel magnet in high-speed operation, so that the stability of the motor is improved and the service life of the motor is prolonged.)

1. The utility model provides a direct current brushless inner rotor motor with halbach array, characterized by, includes stator, rotor, pivot, the rotor sets up at the inside and the stator coaxial setting of stator, the stator comprises stator tooth, stator slot and the winding of winding on the stator tooth, and a plurality of neodymium iron boron permanent magnet steel are pasted to rotor core outer peripheral surface, a plurality of neodymium iron boron permanent magnet steel are halbach array distribution.

2. The dc brushless inner rotor motor with halbach array as claimed in claim 1 wherein said plurality of ndfeb permanent magnets are arranged at equal angular intervals, the included angle of magnetization between adjacent pairs of ndfeb permanent magnets is equal, and the included angle of magnetization between adjacent pairs of ndfeb permanent magnets is no greater than 45 °.

3. The brushless DC internal rotor motor with Halbach array as claimed in claim 2 wherein the number of slots per pole of said Nd-Fe-B permanent magnet satisfies q = z/2pm, q is a fraction that cannot be divided

Wherein m is the number of phases, 2p is the number of poles, and z is the total number of stator slots.

4. The DC brushless inner rotor motor with Halbach array as claimed in claim 3, wherein the NdFeB permanent magnet steel is attached to the outer peripheral surface of the rotor in a state of extending along the axial direction of the rotating shaft, the radial width of the NdFeB permanent magnet steel is greater than the width in the circumferential direction, the NdFeB permanent magnet steel has a fan-shaped section, the center of the fan-shaped section coincides with the center of the rotor, and the thickness of the two ends of the NdFeB permanent magnet steel near the edges of the peripheral surface of the rotor is gradually reduced to form a slope.

5. A DC brushless inner rotor motor with Halbach array as claimed in any one of claims 1-4 wherein the outer surface of the Nd-Fe-B permanent magnet steel is surrounded by a steel fixing layer.

6. The DC brushless inner rotor motor with Halbach array as claimed in claim 5, wherein the magnetic steel fixing layer is formed by winding carbon fiber on the outer surface of Nd-Fe-B permanent magnet steel.

Technical Field

The invention relates to the field of motor magnetic circuits, in particular to a direct-current brushless inner rotor motor with a Halbach array.

Background

The motors used by the existing small household appliances of the washing machine are generally a DD motor and a BLDC motor which are direct-current brushless motors, and the driving principle of the BLDC motor is that a belt is used for connecting the motor and a load device, namely, a small wheel drives a large wheel. However, the belt transmission can cause the problems of large energy loss and low motor efficiency caused by the existence of reverse clearance, inertia, friction and insufficient rigidity in the rotation of the motor; the DD motor is a development direction of advanced level in the industry, rigid connection is directly adopted between the DD motor and a driven workpiece, intermediate links such as a screw rod, a gear, a speed reducer and the like are not needed, and the problems of reverse clearance, inertia, friction and insufficient rigidity existing in a transmission system are avoided to the greatest extent. However, the DD motor needs to change the installation mode of the traditional manufacturing enterprises such as washing machines due to the structural change, the cost is high, and the DD motor has no gear ratio of a belt, and has the problems of low acceleration, difficult high speed ratio, namely low motor power density and large torque pulsation.

For example, a "make things convenient for direct drive motor of speed governing" that discloses on chinese patent literature, its bulletin number "CN 212323852U" includes, including directly driving motor body, the right side of directly driving motor body top and bottom all is equipped with the dead lever, the right side of directly driving motor body is equipped with the cover, the top and the bottom of cover all are equipped with the card case, the right side of dead lever is located the inner box of card case, the inner chamber of card case is equipped with the movable plate, the spout with the movable plate looks adaptation is all seted up to the both sides of card incasement chamber, the both sides at movable plate top and the junction of card case all are equipped with the spring, the top of movable plate is equipped with the pull rod, the top of pull rod runs through and extends to the top of card case, the top of pull rod is equipped with the pull ring. But above-mentioned scheme comes the staff of being convenient for to maintain the motor through the structure of installing convenient to detach at motor top and bottom, does not promote the power performance of motor in essence, and direct drive motor still has the acceleration low, high-speed difficulty, and motor power density is difficult to break through, and the big problem that leads to motor vibration and noise of torque ripple.

Disclosure of Invention

The invention provides a direct-current brushless inner rotor motor with a Halbach array, aiming at overcoming the problems that the power density of the motor of a direct-drive brushless motor in the prior art is difficult to break through, the acceleration of the motor is difficult to be increased at a low speed, and the vibration and the noise of the motor are difficult to be reduced.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a direct current brushless inner rotor motor with halbach array, includes stator, rotor, pivot, the rotor sets up at the inside and the stator coaxial setting of stator, the stator comprises stator tooth, stator slot and the winding of winding on the stator tooth, and a plurality of neodymium iron boron permanent magnet steel have been pasted on the rotor core outer peripheral surface, a plurality of neodymium iron boron permanent magnet steel are halbach array distribution. The output waveform tends to a perfect sine wave, the influence of harmonic magnetic potential is greatly weakened, and the power density and the permanent magnet utilization rate of the permanent magnet synchronous wind driven generator are effectively improved.

Preferably, the neodymium iron boron permanent magnet steels are arranged at equal angular intervals, the magnetization included angles between every two adjacent neodymium iron boron permanent magnets are equal, and the magnetization included angle between every two adjacent neodymium iron boron permanent magnet steels is not more than 45 degrees. The Halbach magnetic steel array further improves the excitation magnetic field to increase the torque density of the motor and improve the performance of the motor.

Preferably, the number of the permanent magnet steel per pole slot of the neodymium iron boron satisfies q = z/2pm, q is irreducible, and the true fraction is zero.

Wherein m is the number of phases, 2p is the number of magnetic poles, and z is the total number of slots of the stator. And q is 16/9, and the fractional slot is adopted to effectively weaken the high-order harmonic potential generated by the non-sinusoidal distribution of the magnetic field of the magnetic pole, improve the waveform of the electromotive force, reduce the pulse vibration amplitude of each magnetic flux caused by the change of the magnetic conductance of the air gap, and reduce the pulse vibration loss on the surface of the magnetic pole.

Preferably, neodymium iron boron permanent magnet steel is attached on the rotor peripheral face along the axial extension state of rotating shaft, and neodymium iron boron permanent magnet steel radial width is greater than the circumferencial direction width, and neodymium iron boron permanent magnet steel section is fan-shaped, fan-shaped centre of a circle and the coincidence of rotor centre of a circle, neodymium iron boron permanent magnet steel both ends are close to rotor peripheral face border department thickness and reduce gradually and form domatic.

Preferably, the outer surface of the neodymium iron boron permanent magnet steel is provided with a magnet steel fixing layer in a surrounding manner. The mechanical reliability of the surface-mounted rotor magnetic steel is improved, and the rotor magnetic steel is prevented from falling off when the motor rotates at a high speed.

Preferably, the magnetic steel fixing layer is formed by winding carbon fibers on the outer surface of the neodymium iron boron permanent magnet steel. The carbon fiber filaments are wound on the outer surface of the neodymium iron boron permanent magnet steel which is pasted on the surface through the filament winder, and the rotor and the carbon fibers are integrally solidified after the carbon fiber filaments are wound, so that the mechanical reliability of the magnet steel is further enhanced.

Therefore, the invention has the following beneficial effects: (1) the surface of the rotor core is pasted with the surface neodymium iron boron permanent magnet steel, and the neodymium iron boron permanent magnet steel is arranged in a Halbach array, so that the power density of the motor and the utilization rate of the permanent magnet are effectively improved. (2) The number of each pole slot of the neodymium iron boron permanent magnet steel is irreducible, so that the number of virtual unit motors is reduced, and the effect of reducing motor pulsation is achieved. (3) the surface of neodymium iron boron permanent magnet steel is equipped with carbon fiber magnet steel fixed layer, has towards the effect of supporting to magnet steel centrifugal force in high-speed operation, improves motor stability and life.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure of an embodiment of the present invention.

In the figure: 1. stator 2, rotor 3, pivot 4, stator tooth 5, stator slot 6, neodymium iron boron permanent magnet steel 7, domatic.

Detailed Description

The invention is further described with reference to the following detailed description and accompanying drawings.

Example (b):

a direct current brushless inner rotor motor with halbach array as shown in fig. 1, including stator 1, rotor 2, pivot 3, rotor 2 sets up at stator 1 inside and stator 1 coaxial setting, stator 1 comprises stator tooth 4, stator slot 5 and the winding of winding on stator tooth 4, and a plurality of neodymium iron boron permanent magnet steel 6 are pasted to rotor 2 iron core outer peripheral surface, a plurality of neodymium iron boron permanent magnet steel 6 are halbach array distribution. The plurality of neodymium iron boron permanent magnet steel 6 are arranged at equal angular intervals, the magnetization included angle between every two adjacent neodymium iron boron permanent magnets is equal, and the magnetization included angle between every two adjacent neodymium iron boron permanent magnet steel 6 is 45 degrees. The number of slots of each pole of the neodymium iron boron permanent magnet steel 6 meets q = z/2pm =16/9, wherein m is the number of phases, 2p is the number of magnetic poles, and z is the total number of slots of the stator 1. The output waveform tends to a perfect sine wave, the influence of harmonic magnetic potential is greatly weakened, and the power density and the permanent magnet utilization rate of the permanent magnet synchronous wind driven generator are effectively improved. The fractional slot is adopted to effectively weaken the higher harmonic potential generated by the non-sinusoidal distribution of the magnetic field of the magnetic pole, improve the waveform of electromotive force, reduce the pulse vibration amplitude of each magnetic flux caused by the change of the magnetic conductance of the air gap, and reduce the pulse vibration loss on the surface of the magnetic pole.

Neodymium iron boron permanent magnet steel 6 is attached on 2 outer peripheral faces of rotor along 3 axial extension states of pivot, and the radial width of neodymium iron boron permanent magnet steel 6 is greater than the circumferencial direction width, and neodymium iron boron permanent magnet steel 6 section is fan-shaped, the coincidence of fan-shaped centre of a circle and 2 centre of a circle of rotor, 6 both ends of neodymium iron boron permanent magnet steel are close to rotor 2 global border department thickness and reduce gradually and form domatic 7. The outer surface of the neodymium iron boron permanent magnet steel 6 is provided with a carbon fiber layer in a surrounding mode, the carbon fiber layer winds carbon fiber filaments on the outer surface of the neodymium iron boron permanent magnet steel 6 which is pasted on the surface through a filament winder, the rotor 2 and the carbon fibers are integrally solidified after winding is completed, and the mechanical reliability of the magnet steel is further enhanced.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although terms such as halbach array, fractional slot, ndfeb, carbon fiber, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.