WO2018076486A1

WO2018076486A1 - Motor

Info

Publication number: WO2018076486A1
Application number: PCT/CN2016/109716
Authority: WO
Inventors: 吴迪; 陈金涛; 诸自强; 王洪晓
Original assignee: 广东威灵电机制造有限公司; 美的威灵电机技术（上海）有限公司
Priority date: 2016-10-31
Filing date: 2016-12-13
Publication date: 2018-05-03

Abstract

Provided is a motor (100), comprising: an outer stator (10); said outer stator (10) comprises at least one outer-stator block; the quantity of outer-stator blocks is smaller than the quantity of outer-stator blocks required along the circumference of the motor (100) to be connected to form a closed loop; an inner stator (20); said inner stator (20) is located, in the radial direction of the motor (100), on the inner side of the outer stator (10) and arranged at an interval with the outer stator (10); the inner stator (20) comprises at least one inner-stator block; the quantity of said inner-stator blocks is the same as the quantity of outer-stator blocks; a rotatable rotor (30); said rotor (30) is a closed loop extending along the circumferential direction of the motor (100); the rotor (30) is located, in the radial direction of the motor (100), on the inner side of the outer stator (10) and the outer side of the inner stator (20).

Description

Motor

Technical field

The present invention relates to the field of motor technology, and more particularly to an electric machine.

Background technique

At present, direct drive technology has been increasingly applied to industry and life. Due to the omission of the transmission, the system efficiency of the direct drive technology has been effectively improved. In the related art, the direct drive technology is mainly applied to low-speed and high-torque applications, in order to improve the efficiency of the motor under low-speed and high-torque driving. The motor needs to increase the outer diameter or the axial length as much as possible, the volume of the stator is significantly increased, and the cost of the stator portion is correspondingly increased.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

To this end, the present invention provides an electric motor that has a simple structure, high system efficiency, cost saving, and wide application range.

An electric machine according to an embodiment of the present invention includes: an outer stator including at least one outer stator block, the outer stator block having a smaller number than an outer stator required to be connected in a closed loop shape along a circumferential direction of the motor a number of partitions; an inner stator located inside the outer stator and spaced apart from the outer stator in a radial direction of the motor, the inner stator including at least one inner block, the inner stator The number of segments is the same as the number of the outer stator segments; a rotatable rotor having a closed loop shape extending in the circumferential direction of the motor, the rotor being located outside the motor in the radial direction The inside of the stator and the outside of the inner stator.

According to the motor of the embodiment of the present invention, the inner stator block and the outer stator block are respectively disposed on the inner side and the outer side of the rotor, and the number of the outer stator block and the inner stator block are equalized, so that the outer diameter of the rotor is changed. On the upper side, the volume of the stator does not change significantly, which saves the cost of the stator part, and at the same time improves the efficiency of the motor in the case of low-speed and large-torque driving; and without changing the radial size of the rotor, the overall size of the motor can be reduced. The structure of the motor is more compact, and is suitable for applications such as household appliances, electric vehicles, wind power generation and the like. The motor has the advantages of simple structure, high work efficiency, low cost and wide application range.

In addition, the motor according to an embodiment of the present invention may further have the following additional technical features:

According to an embodiment of the invention, the outer stator is divided into a plurality of pieces and evenly arranged along the circumferential direction of the motor, the inner stator being divided into a plurality of pieces and evenly arranged along the circumferential direction of the motor.

According to an embodiment of the invention, the outer stator block and the inner stator block are arranged one above the other in the circumferential direction of the motor.

According to an embodiment of the invention, the rotor comprises: a plurality of magnetic cores and a plurality of non-magnetic spacing blocks, a plurality of The magnetic core and the plurality of non-magnetic spacer blocks are alternately arranged along the circumferential direction of the motor.

According to an embodiment of the invention, the outer stator segment comprises: an outer stator core and a stator winding, the stator winding being wound on the outer stator core.

According to an embodiment of the invention, the inner stator block comprises: an inner stator core and a permanent magnet, the permanent magnet being disposed on the inner stator core.

According to an embodiment of the invention, the pole pair of the magnetic field generated by each of the outer stator segments is ps, the number of permanent magnets of the inner stator is npm0 and the magnetic field generated by each of the inner stator blocks The number of pole pairs is pf=npm0/2, the number of cores of the rotor is pr and satisfies: pr=n0|ps±pf|, where n0 is required to be connected in a closed loop shape along the circumferential direction of the motor The number of outer stator blocks.

According to an embodiment of the invention, the inner stator segment comprises: an inner stator core and a stator winding, the stator winding being wound on the inner stator core.

According to an embodiment of the invention, the outer stator segment comprises: an outer stator core and a permanent magnet, the permanent magnet being disposed on the outer stator core.

According to an embodiment of the invention, the pole pair number of the magnetic field generated by each of the inner stator segments is ps, the number of permanent magnets of the outer stator is npm0 and the magnetic field generated by each of the outer stator blocks The number of pole pairs is pf=npm0/2, the number of cores of the rotor is pr and satisfies: pr=n0|ps±pf|, where n0 is required to be connected in a closed loop shape along the circumferential direction of the motor The number of inner stator blocks.

According to an embodiment of the present invention, the motor further includes: a stator fixing plate and a rotor fixing plate, the inner stator core is located inside the outer stator core of the stator in a radial direction of the motor and The outer stator cores are spaced apart, and the rotor fixing plate and the stator fixing plate are spaced apart from each other in the axial direction of the motor and are connected to the output shaft, and the rotor is disposed on the rotor fixing plate.

According to an embodiment of the invention, each of the outer stator segments has a plurality of stator teeth and a plurality of slots respectively located between adjacent stator teeth, the number of stator teeth of each of the outer stator segments being Ns0, the groove pitch angle of the adjacent tooth slots of each of the outer stator blocks is α0 and satisfies: α0=2π/Ns0/n0, where n0 is required to be connected in a closed loop shape along the circumferential direction of the motor The number of outer stator blocks.

According to an embodiment of the invention, the central axis of the outer stator, the central axis of the inner stator and the central axis of the rotor coincide.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

1 is a longitudinal cross-sectional view of a motor in accordance with an embodiment of the present invention;

2 is a cross-sectional view of a motor in accordance with an embodiment of the present invention;

Figure 3 is a longitudinal cross-sectional view of a motor in accordance with another embodiment of the present invention;

Figure 4 is a cross-sectional view of a motor in accordance with another embodiment of the present invention;

Fig. 5 is an enlarged view of a portion D in Fig. 4;

Reference mark:

100: motor;

10: outer stator; 10a: stator teeth; 10b: cogging;

11: outer stator core; 12: stator winding; 13: permanent magnet;

20: inner stator;

21: inner stator core; 22: permanent magnet; 23: stator winding;

30: rotor;

31: magnetic core; 32: non-magnetic spacing is fast;

40: output shaft;

50: bearing;

60: stator fixing plate;

70: Rotor fixed plate.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

The motor 100 according to an embodiment of the present invention will be specifically described below with reference to FIGS. 1 through 5.

An electric machine 100 according to an embodiment of the present invention includes an outer stator 10, an inner stator 20, a rotatable rotor 30, and an output shaft 40.

Specifically, the outer stator 10 includes at least one outer stator block, the number of outer stator segments being smaller than the number of outer stator segments required to be connected in a closed loop shape along the circumferential direction of the motor 100, and the inner stator 20 at the diameter of the motor 100 Upwardly located on the inner side of the outer stator 10 and spaced apart from the outer stator 10, the inner stator 20 includes at least one inner block, the number of inner stator blocks is the same as the number of outer stator blocks, and the outer stator block and the inner stator block are along The circumferential direction of the motor 100 is relatively one-to-one, and the rotor 30 has a closed-loop shape extending in the circumferential direction of the motor 100. The rotor 30 is located on the inner side of the outer stator 10 and the outer side of the inner stator 20 in the radial direction of the motor 100, and the output shaft 40 is The rotors 30 are connected.

In other words, the motor 100 is mainly composed of an outer stator 10, an inner stator 20, a rotatable rotor 30, and an output shaft 40, wherein the outer stator 10 is composed of at least one outer stator block, and the inner stator block is composed of at least one inner stator. Block composition, outside The number of the stator block and the inner stator block are the same, respectively smaller than the number of blocks required to be connected to the closed ring along the circumferential direction of the motor 100, and the outer stator block and the inner stator 20 are arranged one-to-one along the circumferential direction of the motor 100, In the radial direction of the motor 100, the outer stator 10 is spaced apart from the inner stator 20, that is, the outer stator 10 is spaced apart from the inner stator 20 by a certain distance, and the outer stator 10 is located outside the inner stator 20.

Further, the rotor 30 is formed as a closed ring in the circumferential direction of the motor 100, and a rotor 30 is disposed in the interval between the outer stator 10 and the inner stator 20 in the radial direction of the motor 100, that is, the rotor 30 is located radially in the motor 100 The inner side of the stator 10 and the outer side of the inner stator 20, the rotor 30 is connected to the output shaft 40, and the rotation of the rotor 30 causes the output shaft 40 to also rotate, thereby performing work on the outside.

Thus, according to the motor 100 of the embodiment of the present invention, the inner stator block and the outer stator block are respectively disposed on the inner side and the outer side of the rotor 30, and the positions of the outer stator block and the inner stator block are corresponding and equal in number, Thus, on the basis of the change of the outer diameter of the rotor 30, the volume of the stator does not change significantly, the cost of the stator portion is saved, and the efficiency of the motor 100 in the case of low-speed and large-torque driving is improved; and the diameter of the rotor 30 is not changed. The size of the motor 100 can be reduced, so that the structure of the motor 100 is more compact, and is suitable for applications such as household appliances, electric vehicles, wind power generation, and the like. The motor 100 has a simple structure, high work efficiency, low cost, and wide application range.

In some embodiments of the invention, the outer stator block and the inner stator block respectively comprise one.

Specifically, as shown in FIGS. 3 to 5, the outer stator 10 of the motor 100 includes an outer stator block. Correspondingly, the inner stator 20 also includes an inner stator block, and the outer stator block and the inner stator block. Corresponding positions, that is, the outer stator 10 and the inner stator 20 respectively form arc segments provided on the outer side and the inner side of the rotor 30, and on the basis of ensuring high torque, it is advantageous to reduce the volume of the motor 100, thereby reducing the motor. The cost of 100 can further reduce the weight of the motor 100.

In still other embodiments of the present invention, the outer stator is divided into a plurality of pieces and evenly arranged along the circumferential direction of the motor 100, and the inner stator is divided into a plurality of pieces and evenly arranged along the circumferential direction of the motor 100.

That is, the outer stator 10 includes a plurality of outer stator segments that are evenly spaced along the circumferential direction of the motor 100, and the inner stator 20 includes a plurality of inner stator segments that are evenly spaced along the circumference of the motor 100, And the positions of the plurality of outer stator segments are in one-to-one correspondence with the positions of the plurality of inner stator segments, and each outer stator segment and the corresponding inner stator segment are spaced apart in the radial direction of the motor 100, and the outer stator is divided. Located on the outer side of the inner stator 20, the rotor 30 can be disposed between the outer stator 10 and the inner stator 20, thereby ensuring that the outer stator 10 and the inner stator 20 can generate a uniform magnetic field, thereby improving the performance of the motor 100, thereby improving the motor 100. quality.

It can be understood that the number of outer stator blocks and inner stator blocks can be flexibly set according to actual conditions, for example, if three outer stator blocks and three inner stator blocks can be set; or outer stator block and default The number of sub-blocks includes five equals.

The rotor 30 includes a plurality of magnetic cores 31 and a plurality of non-magnetic spacing blocks 32. The plurality of magnetic cores 31 and the plurality of non-magnetic spacing blocks 32 are alternately arranged along the circumferential direction of the motor 100.

In other words, the rotor 30 is mainly composed of a plurality of cores 31 and a plurality of non-magnetic spacers 32, and the plurality of cores 31 and the plurality of non-magnetic spacers 32 are alternately arranged in the circumferential direction of the motor 100, respectively. To form a closed loop, that is, a non-magnetic spacing block 32 is disposed on each adjacent side of each of the conductive cores 31, and a conductive core 31 is disposed between each of the two non-magnetic spacing blocks 32. According to the size of the load, the outer diameter of the rotor 30 can be freely selected, and the volume of the stator does not change significantly, and the amount of the stator is not affected.

A closed annular rotor 30 formed in the radial direction of the motor 100, a plurality of cores 31 and a plurality of non-magnetic spacers 32 is located between the outer stator 10 and the inner stator 20, that is, in the radial direction of the motor 100, and the rotor 30 is located in the inner stator. The outer side of the outer stator 10, the inner side of the outer stator 10, and the rotor 30 have a certain gap with the outer stator 10 and the inner stator 20, respectively. When the rotor 30 rotates, the outer stator 10 and the inner stator 20 do not jam the rotor 30. The normal operation of the motor 100 is ensured.

In some embodiments of the invention, the outer stator block includes an outer stator magnet core 11 and a stator winding 12 wound on the outer stator core 11 .

That is to say, the outer stator block is mainly composed of the outer stator core 11 and the stator winding 12, and the outer stator core 11 can be processed by a high-magnetic material, and the stator winding 12 is wound around the outer stator core 11 Above, as shown in FIG. 2, the stator winding 12 is wound around three, A, B and C of the outer stator core 11 and the stator winding 12 forms a three-phase winding. When three-phase current is applied, each outer stator is divided. The stator winding 12 corresponding to the block generates a magnetic field.

Wherein each outer stator block has a plurality of stator teeth 10a and a plurality of slots 10b respectively located between adjacent stator teeth 10a, and the number of stator teeth 10a of each outer stator block is Ns0, and each outer stator The groove pitch angle of the adjacent tooth grooves 10b of the block is α0 and satisfies: α0 = 2π / Ns0 / n0, where n0 is the number of outer stator blocks required to be connected in a closed loop shape along the circumferential direction of the motor 100.

As shown in FIG. 1, a plurality of stator teeth 10a are arranged on each outer stator block, and a plurality of stator teeth 10a define a plurality of slots 10b, and the stator teeth 10a and the slots 10b are alternately arranged, and each of Ns0 is used. For the number of stator teeth 10a of the outer stator block, α0 represents the groove angle of the adjacent tooth groove 10b of each outer stator block, then Ns0 and α0 satisfy α0=2π/Ns0/n0, and n0 represents the motor 100. The number of outer stator segments required to be circumferentially connected in a closed loop shape, that is, the groove pitch angle of the adjacent tooth grooves 10b of each outer stator block is equal to 360° and the number of stator teeth 10a of each outer stator block N0 times the quotient of Ns0.

Further, the inner stator block includes an inner stator core 21 and a permanent magnet 22, and the permanent magnet 22 is disposed on the inner stator core 21 . As shown in FIG. 2, the inner stator 20 is mainly composed of an inner stator core 21 and a permanent magnet 22. The inner stator core 21 can also be processed from a high magnetic material, and the permanent magnet 22 is disposed on the inner stator core. 21, in the circumferential direction of the motor 100, the permanent magnets 22 are evenly spaced on the inner stator core 21, and the permanent magnets 22 are parallel magnetized, that is, the permanent magnets 22 of the same polarity are relatively uniform. Arranged on the inner stator core 21 to produce an equivalent permanent magnetic field.

Preferably, the number of pole pairs of the magnetic field generated by each outer stator block is ps, the number of permanent magnets 22 of the inner stator 20 is npm0, and the number of pole pairs of the magnetic field generated by each inner stator block is pf=npm0/2 The number of the conductive cores 31 of the rotor 30 is Pr satisfies: pr = n0 | ps ± pf|, where n0 is the number of outer stator segments required to be connected in a closed loop shape along the circumferential direction of the motor 100.

For example, when the stator winding 12 is supplied with a drive current corresponding to the number of phases (for example, a three-phase stator winding is supplied with a three-phase current), the stator winding 12 of each outer stator block generates a magnetic field having a pole-number ps, corresponding to The number of permanent magnets 22 of the inner stator 20 is npm0, and the number of pole pairs of the equivalent permanent magnetic field generated by the permanent magnets 22 of each inner stator block is pf=npm0/2, that is, the permanent magnet of each inner stator block. The magnetic pole pair generated by 22 is half of the number of permanent magnets 22 of the inner stator 20.

Further, the rotor 30 has pr magnet cores 31, and the number pr of the cores 31 should satisfy pr = n0 | ps ± pf|, that is, the number of the cores 31 of the rotor 30 is equal to the closed loop in the circumferential direction of the motor 100. The number of outer stator segments required for the shape is the product of the number of pairs of magnetic poles generated by each outer stator 10 and the absolute value of the sum of the logarithms of the magnetic poles generated by each inner stator 20, and it can be said that the rotor 30 is The number of the conductive cores 31 is n0 times the absolute value of the sum of the magnetic poles generated by each outer stator 10 and the logarithm of the magnetic poles generated by each inner stator 20 (n0 is connected in a closed loop shape along the circumferential direction of the motor 100). The number of outer stator segments required, such as the number of magnet cores 31 of the rotor 30, is pr = 30, which satisfies the formula pr = n0 | ps ± pf |.

It should be noted that the motor 100 in the above embodiment mainly includes a three-layer structure, that is, an outer stator 10, a rotor 30, and an inner stator 20, wherein the outer stator 10 includes an outer stator core 11 and a stator winding 12, that is, the outer stator 10 For the excitation side of the stator winding, the inner stator 20 includes an inner stator core 21 and a permanent magnet 22, that is, the inner stator 20 is a permanent magnet excitation side of the stator, and the excitation side of the stator winding and the permanent magnet excitation side of the stator are used as components of the stator, respectively. The outermost layer and the innermost layer disposed radially in the motor 100 may also be arranged oppositely, that is, the excitation side of the stator winding is disposed at the innermost layer in the radial direction of the most motor 100, and the permanent magnet excitation side of the stator is disposed in the radial direction of the motor 100. The outer layer, the rotor 30 is located between the excitation side of the stator winding and the excitation side of the permanent magnet of the stator.

In still other embodiments of the present invention, the inner stator block includes: an inner stator magnet core 21 and a stator winding 23, the stator winding 23 is wound on the inner stator core 21, and the outer stator block includes: an outer stator The magnetic core 11 and the permanent magnet 13 are provided on the outer stator core 11 .

In other words, by arranging the outer stator 10 of the above embodiment opposite to the position of the inner stator 20, that is, the outer stator 10 of Fig. 1 is arranged as the inner stator 20 of Fig. 3, the inner stator 20 of Fig. 1. Arranged as the outer stator in FIG. 3, the outer stator in FIGS. 3 to 5 is the stator permanent magnet excitation side, and the inner stator 20 is the stator winding excitation side.

Further, the number of pole pairs of the magnetic field generated by each inner stator block is ps, the number of permanent magnets 13 of the outer stator is npm0, and the number of pole pairs of the magnetic field generated by each outer stator block is pf=npm0/2. The number of the conductive cores 31 of the rotor 30 is pr and satisfies: pr = n0 | ps ± pf|, where n0 is the number of inner stator segments required to be connected in a closed loop shape along the circumferential direction of the motor 100.

It can be understood that, by the oppositely arranged inner and outer stators, the pole pair of the magnetic field generated by the stator windings 23 of each inner stator block is expressed as ps, and the number of mounted permanent magnets 13 on the outer stator 10 is npm0. Each outer stator block The number of pole pairs generated by the upper permanent magnet 13 is half of the number of permanent magnets 13 placed on the outer stator 10. The number of the magnetic cores 31 of the rotor 30 is the number of magnetic pole pairs generated by each inner stator block and each outer The stator segments produce n0 times the logarithm and/or difference of the magnetic field poles, where n0 is the number of inner stator segments required to connect in a closed loop shape along the circumference of the motor 100.

Further, the motor 100 further includes a stator fixing plate 60 and a rotor fixing plate 70 which are located inside the outer stator core 11 and radially spaced apart from the outer stator core 11 in the radial direction of the motor 100, and the rotor The fixing plate 70 and the stator fixing plate 60 are arranged spaced apart in the axial direction of the motor 100 and connected to the output shaft 40, and the rotor 30 is provided on the rotor fixing plate 70.

Specifically, as shown in FIG. 1 and FIG. 3, the motor 100 further includes a stator fixing plate 60 and a rotor fixing plate 70. In the radial direction of the motor 100, an outer stator core 11 and a rotor 30 are sequentially disposed from the outside to the inside. The inner stator magnet core 21, that is, the outer stator core 11 is located at the outermost layer, the inner stator core 21 is located at the innermost layer, and the outer stator core 11 and the inner stator core 21 are separated by a certain gap, and A rotor 30 is provided at this interval.

The outer stator core 11 and the inner stator core 21 are respectively placed on the stator fixing plate 60. At the bottom center of the stator fixing plate 60, an output shaft 40 and a bearing 50 are connected, and the rotor fixing plate 70 is at the axis of the output shaft 40. Arranged upwardly from the stator fixing plate 60, the rotor fixing plate 70 is located above the stator fixing plate 60, the rotor fixing plate 70 is respectively connected with the output shaft 40 and the rotor 30, and the rotor 30 can drive the output shaft 40 to rotate through the rotor fixing plate 70. The output shaft 40 maintains rotational independence with the stator fixing plate 60 through the bearing 50. Further, the stator fixing plate 60 functions to carry the upper end member.

Preferably, the central axis of the outer stator 10, the central axis of the inner stator 20, and the central axis of the rotor 30 coincide.

As shown in FIG. 2, a plurality of outer stator segments and a plurality of inner stator segments are respectively evenly spaced along the circumferential direction of the motor 100, the rotor 30 has a closed annular shape, a ring formed by the outer stator 10, and the rotor 30 is closed. The annular and inner stators 20 are formed by the annular three annular centers (i.e., the position of the output shaft 40 in Fig. 2), that is, the central axis of the outer stator 10, the central axis of the inner stator 20 and the central axis of the rotor 30 are the same center. Axis.

The motor 100 according to an embodiment of the present invention will be described in detail below with reference to specific embodiments.

As shown in FIGS. 1 to 5, a motor 100 according to an embodiment of the present invention includes an outer stator 10, an inner stator 20, a rotatable rotor 30, an output shaft 40, a bearing 50, a stator fixing plate 60, and a rotor fixing plate 70.

Specifically, the outer stator 10 is composed of a plurality of stator blocks (three outer stators 10 are shown as outer stator blocks in FIG. 2), and the inner stator 20 is composed of a plurality of stator blocks (shown in FIG. 2). 3 inner stators 20 block inner stator blocks), 3 outer stators 10 block outer stator blocks and 3 inner stators 20 block inner stator blocks are evenly spaced along the circumferential direction of the motor 100, respectively In the radial direction of the motor 100, the outer stator block of the outer stator 10 is spaced apart from the stator block of the inner stator 20, and the positions are one-to-one correspondence, and the outer stator 10 block outer stator block is located in the inner stator 20 block. On the outer side of the sub-block, the rotor 30 is disposed between the outer stator 10 and the inner stator 20 to form a closed loop. In the radial direction of the motor 100, the outer stator 10, the rotor 30 and the inner stator 20 are sequentially from the outside to the inside.

The outer stator 10 and the inner stator 20 are placed on the stator fixing plate 60, and the output shaft 40 is located at the center of the stator fixing plate 60, and is coupled to the stator fixing plate 60 through a bearing 50. In the axial direction of the output shaft 40, the rotor fixing plate 70 Arranged spaced apart from the stator retaining plate 60, the rotor retaining plate 70 is coupled to the output shaft 40 and the rotor 30.

As shown in FIG. 1 and FIG. 2, in the embodiment, it is further illustrated that the motor 100 mainly includes a three-layer structure, that is, a stator winding excitation side, a stator permanent magnet excitation side, and a reluctance rotor 30, and a stator winding. The excitation side and the stator permanent magnet excitation side are formed as components of the stator, and may be respectively arranged in the outermost layer and the innermost layer in the radial direction of the motor 100, or vice versa, that is, respectively arranged in the innermost layer and the outermost layer, and the rotor 30 is located. The center of the stator winding excitation side and the stator permanent magnet excitation side are spaced apart by a fixed air gap.

The excitation side of the stator winding (ie, the outer stator 10) is composed of a high-magnetic material composed of a segmented outer stator core 11 and a stator winding 12 wound thereon. The stator winding 12 may be single-phase or multi-phase, and the actual The number of blocks n1 and the number of theoretical blocks n0 required to fill the entire circle along the circumference of the motor 100 (i.e., the number of outer stator cores 11 corresponding to a stator core of a complete circumference) satisfy 1 ≤ n1 < N0, the span of the coil of the stator winding 12 may be 1 or any positive integer matching the number of teeth of the segmented magnetic core 11 , the number of teeth of each of the divided magnetic cores 11 is Ns0, and the groove angle satisfies α0=2π/Ns0 /n0, when a drive current corresponding to the number of phases of the stator winding 12 is supplied, each of the stator winding excitation side blocks generates a magnetic field having a pole-number ps.

The permanent magnet excitation side of the stator (ie, the inner stator 20) is composed of an inner stator core 21 and a permanent magnet 22 made of a highly magnetic material, and the permanent magnets 22 are evenly arranged along the circumference of the motor 100 in an alternating polarity manner. Any form of mounting of the rotor 30, namely built-in (IPM), surface mount (SPM), surface mount (Inset-SPM), and the like. The theoretical number of blocks on the permanent magnet side of the stator is n0 (that is, the number of inner stator cores 21 corresponding to the stator core of a complete circumference), and the actual number of blocks is the same as the excitation side of the stator winding. The number of permanent magnets 22 on the excitation side is npm0, and the logarithm of the equivalent magnetic field generated by the excitation side of the stator permanent magnet of each block is pf=npm0/2.

The reluctance rotor (ie, the rotor 30) is alternately arranged by a conductive core 31 made of a highly magnetically permeable material and a non-magnetically permeable spacer 32 composed of a non-magnetic material to form a complete circumference (closed loop) without using a block. In the form, the number of core blocks of the reluctance rotor is pr. Preferably, the number of cores 31 of the reluctance rotor should satisfy pr = n0 | ps ± pf |. The reluctance rotor is directly connected to the output shaft 40 through the rotor fixing plate 70 as a torque output element of the motor 100.

The motor 100 of the embodiment of the present invention will be described in detail below in conjunction with a plurality of embodiments.

Embodiment 1

As shown in FIGS. 1 and 2, the outer stator 10 is arranged on the outermost side of the radial three-layer structure of the motor 100, the inner stator 20 is arranged on the innermost side of the radial three-layer structure of the motor 100, and the rotor 30 is located on the two-layer stator. In the middle, and maintaining a certain gap between the two layers of stators, the outer stator 10 and the inner stator 20 are respectively placed on the stator fixing plate 60, the rotor 30 is directly connected to the output shaft 40 through the rotor fixing plate 70, and the output shaft 40 passes through the bearing 50. It is connected to the stator fixing plate 60 and maintains rotational independence.

The actual number of blocks of the outer stator 10 is n1=3, the number of theoretical blocks n0=12, and the outer stator 10 is composed of the outer stator core 11 and the stator winding 12 wound thereon, and the number of teeth of each outer stator block Ns0=3, the stator winding 12 is a three-phase winding, and the winding coil span is 1. When the three-phase current is injected, each outer stator block generates a magnetic field with a pole pair number ps=1.

The number of blocks of the inner stator 20 is also n1=3, which is composed of the inner stator core 21 and the permanent magnet 22. The permanent magnets 22 are parallel magnetized, and are uniformly placed on the inner stator in the same manner as the permanent magnets 22 of the same polarity. In the magnetic core 21, the equivalent permanent magnet magnetic field has a logarithm of pf=1.5, the rotor 30 is composed of a magnetic core 31 and a non-magnetic spacer 32, and the number of blocks of the magnetic core 31 of the rotor 30 is pr=30, which satisfies The preferred formula is pr=n0|ps±pf|.

Embodiment 2

As shown in FIGS. 3 to 5, the outer stator 10 is arranged on the outermost side of the radial three-layer structure of the motor 100, the inner stator 20 is arranged on the innermost side of the radial three-layer structure of the motor 100, and the rotor 30 is located on the two-layer stator. In the middle, and maintaining a certain gap with the two-layer stator, the outer stator 10 and the inner stator 20 are placed on the stator fixing plate 60, the rotor 30 is directly connected to the output shaft 40 through the rotor fixing plate 70, and the output shaft 40 is fixed to the stator through the bearing 50. The plates 60 are connected and maintain rotational independence.

The actual number of blocks of the inner stator 20 is n1=1, the number of theoretical blocks n0=16, and the inner stator 20 is composed of the inner stator core 21 and the stator winding 23 wound thereon, and the number of teeth of each inner stator block Ns0=3, the stator winding 23 is a three-phase winding, and the winding coil span is 1. When the three-phase current is injected, each inner stator block generates a magnetic field with a pole pair number ps=1.

The number of blocks of the outer stator 10 is also n1=1, which is composed of the outer stator core 11 and the permanent magnet 13. The permanent magnets 13 are parallel magnetized and uniformly placed in the opposite direction to the permanent magnets 13 of the same polarity. In the stator 10, the equivalent permanent magnetic field generated by the pole pair pf = 3. The rotor 30 is composed of a core 51 and a non-magnetic spacer block 32. The number of blocks of the core 30 of the rotor 30 is pr=64, which satisfies a preferred formula, that is, pr=n0|ps±pf|.

In addition, the outer stator core 19 of the outer stator 10, the inner stator core 21 of the inner stator 20, and the core of the rotor 30 may be made of a high magnetic permeability material such as silicon steel sheet, cobalt steel sheet, permalloy, or SMC. Manufactured, but the invention is not limited to this. The stator windings 23 may be single-phase or multi-phase. The stator windings 23 may be in the form of fractional-slot windings or integer-slot windings. The material of the stator windings 23 may be copper enameled wire, aluminum enameled wire, etc., but the invention is not limited thereto.

The inner stator 20 can adopt any mounting form of the conventional permanent magnet rotor 30, that is, built-in type (IPM), surface mount type (SPM), surface mount type (Inset-SPM), etc., and the permanent magnet 13 can be made of aluminum-iron-boron, The high coercive permanent magnet material such as ferrite, samarium cobalt, and aluminum nickel cobalt is used, and the present invention is not limited thereto.

The outer diameter of the rotor 30 of the present invention can be freely selected with the type of load without significantly changing the stator volume, and does not significantly affect the amount of the permanent magnet 13 under the premise that the outer diameter of the rotor 30 is changed. Under a certain stator excitation magnetic field, the output torque of the motor 100 is increased in a square relationship with the outer diameter of the motor 100. Therefore, the outer diameter of the rotor 30 can be increased without significantly changing the cost and the stator volume. The torque density of the motor 100 is greatly increased.

Thus, by providing one-to-one and equal number of outer stator segments and inner stator segments along the circumferential direction of the motor 100, the inner stator 20 is spaced apart from the outer stator 10 in the radial direction of the motor 100, and the inner stator 20 is located inside the outer stator 10 On the side, the rotor 30 is formed in a closed loop shape extending in the circumferential direction of the motor 100, and is disposed between the outer stator 10 and the inner stator 20, so that when the outer diameter of the rotor 30 is changed, the volume of the stator does not change significantly, and the stator portion is saved. The cost and the efficiency of the motor 100 in the low-speed and large-torque driving are improved, and the structure is simple, and can be applied to household appliances, electric vehicles, wind power generation and the like. The motor 100 has a simple structure, high system efficiency, cost saving, and wide application range.

Other configurations and operations of the motor 100 in accordance with embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. Or in one piece; it may be a mechanical connection, or it may be an electrical connection or a communication with each other; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship between two elements. Unless otherwise expressly defined. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A motor characterized in that:

An outer stator comprising at least one outer stator block, the number of outer stator segments being less than the number of outer stator segments required to be connected in a closed loop shape along a circumferential direction of the motor;

An inner stator located inside the outer stator and spaced apart from the outer stator in a radial direction of the motor, the inner stator including at least one inner block, the number of inner stator blocks and The number of the outer stator blocks is the same;

A rotatable rotor having a closed loop shape extending in a circumferential direction of the motor, the rotor being located inside the outer stator and outside of the inner stator in a radial direction of the motor.
The motor according to claim 1, wherein said outer stator is divided into a plurality of pieces and uniformly arranged along a circumferential direction of said motor, said inner stator being divided into a plurality of sections and along a circumference of said motor Arrange evenly.
The motor according to claim 1 or 2, wherein said outer stator block and said inner stator block are disposed one on another in the circumferential direction of said motor.
The electric machine according to any one of claims 1 to 3, wherein the rotor comprises:

a plurality of magnetic cores;

a plurality of non-magnetically-permeable spacer blocks, a plurality of the magnetic conductive cores and a plurality of the non-magnetic magnetic spacer blocks are alternately arranged along a circumferential direction of the motor.
The electric machine according to claim 4, wherein said outer stator block comprises:

External stator core;

A stator winding wound on the outer stator core.
The electric machine according to claim 5, wherein said inner stator block comprises:

Inner stator core;

a permanent magnet, the permanent magnet being disposed on the inner stator core.
The motor according to claim 6, wherein each of said outer stator segments generates a magnetic field having a pole pair number ps, said inner stator having a number of permanent magnets npm0 and each said inner stator portion The pole number of the magnetic field generated by the block is pf=npm0/2, and the number of cores of the rotor is pr and satisfies:

Pr=n0|ps±pf|, where n0 is the number of outer stator segments required to be connected in a closed loop shape along the circumferential direction of the motor.
The electric machine according to claim 4, wherein said inner stator block comprises:

Inner stator core;

A stator winding wound on the inner stator core.
The electric machine of claim 8 wherein said outer stator block comprises:

External stator core;

a permanent magnet, the permanent magnet being disposed on the outer stator core.
The motor according to claim 9, wherein each of said inner stator segments generates a magnetic field having a pole pair number ps, said outer stator having a number of permanent magnets npm0 and each said outer stator portion The pole number of the magnetic field generated by the block is pf=npm0/2, and the number of cores of the rotor is pr and satisfies:

Pr=n0|ps±pf|, where n0 is the number of inner stator segments required to be connected in a closed loop shape along the circumferential direction of the motor.
The motor according to claim 6 or 9, further comprising:

a stator fixing plate, the inner stator core is located inside the outer stator core of the stator in a radial direction of the motor and spaced apart from the outer stator core;

a rotor fixing plate, the rotor fixing plate and the stator fixing plate are spaced apart from each other in an axial direction of the motor and connected to the output shaft, and the rotor is disposed on the rotor fixing plate.
The electric machine according to claim 5, wherein each of said outer stator segments has a plurality of stator teeth and a plurality of slots respectively located between adjacent stator teeth, each of said outer stator blocks The number of stator teeth is Ns0, and the pitch angle of adjacent slots of each of the outer stator blocks is α0 and satisfies:

00 = 2π / Ns0 / n0, where n0 is the number of outer stator segments required to be connected in a closed loop shape along the circumferential direction of the motor.
The electric machine according to any one of claims 1 to 12, characterized in that the central axis of the outer stator, the central axis of the inner stator and the central axis of the rotor coincide.