Dual-stator and dual-rotor magnetic field modulation compound motor

Abstract

The present invention provides a dual-stator, dual-rotor, magnetic field modulation composite motor. The motor comprises an outer stator, an outer rotor, an inner rotor, and an inner stator, arranged in sequence from outside to inside. The outer stator comprises an outer stator core, the inner circumference of which is evenly distributed with multiple outer stator teeth, each wound with an outer armature winding. The inner stator comprises an inner stator core, the outer circumference of which is evenly distributed with multiple inner stator teeth, each wound with an inner armature winding. The number of inner stator teeth is the same as the number of outer stator teeth, and each inner stator tooth corresponds to each outer stator tooth in a one-to-one relationship. The outer rotor comprises a permanent magnet ring composed of a plurality of alternating first and second permanent magnets, each magnetized in opposite directions. The inner rotor comprises a modulation ring composed of multiple magnetic modulation cores, with the arc ratio between each magnetic modulation core and the gap adjacent to it being 0.86:1. This invention enables direct-drive, low-speed, dual-end, high-torque output.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment control, and in particular to a dual-stator dual-rotor magnetic field modulation composite motor. Background Art

[0002] The main motors currently in use are induction motors, wound-pole synchronous motors, and permanent magnet synchronous motors. Non-permanent magnet motors offer economic advantages but are lacking in performance. Permanent magnet specialty motors, with their unique structure, offer outstanding performance and are the future direction of development. Summary of the Invention

[0003] The object of the present invention is to provide a dual-stator dual-rotor magnetic field modulation composite motor that can better meet the requirements of a high-torque direct drive system within a wide speed range.

[0004] To achieve the above object, the present invention provides a dual-stator dual-rotor magnetic field modulation composite motor, which comprises:

[0005] An outer stator, comprising an outer stator core, wherein the inner circumference of the outer stator core is uniformly distributed with a plurality of radially extending outer stator teeth, an outer tooth slot is formed between two adjacent outer stator teeth, and an outer armature winding is wound around the outer stator teeth;

[0006] an outer rotor disposed inside the outer stator, the outer rotor comprising a permanent magnet ring consisting of a plurality of alternating first permanent magnets and second permanent magnets, wherein the curvature of each first permanent magnet and each second permanent magnet is the same, and the magnetization directions of the first permanent magnet and the second permanent magnet are opposite;

[0007] an inner rotor disposed inside the outer rotor, the inner rotor comprising a modulation ring composed of a plurality of magnetic modulation cores, with a gap between adjacent magnetic modulation cores, and an arc ratio between each magnetic modulation core and the gap adjacent to it being 0.86:1;

[0008] An inner stator is arranged inside the inner rotor, and the inner stator includes a stator core. The outer circumferential surface of the inner stator core is evenly distributed with a plurality of radially extending inner stator teeth. The inner stator teeth are wound with inner armature windings. An inner tooth slot is formed between two adjacent inner stator teeth. The inner tooth slot is a semi-closed slot. The number of the inner stator teeth is the same as the number of the outer stator teeth, and the position of each inner stator tooth corresponds one-to-one to that of each outer stator tooth.

[0009] In the dual-stator dual-rotor magnetic field modulation composite motor as described above, the slot fill rates of the outer armature winding and the inner armature winding are both less than or equal to 70%.

[0010] In the dual-stator dual-rotor magnetic field modulation composite motor as described above, the air gap length between the outer stator and the outer rotor, the air gap length between the outer rotor and the inner rotor, and the air gap length between the inner rotor and the inner stator are equal.

[0011] In the dual-stator dual-rotor magnetic field modulation composite motor as described above, the outer armature winding is a single-layer concentrated winding, and the inner armature winding is a single-layer distributed winding.

[0012] In the dual-stator dual-rotor magnetic field modulation composite motor as described above, the outer stator core, the magnetic modulation block core and the inner rotor core are all formed by stacking silicon steel sheets.

[0013] In the dual-stator dual-rotor magnetic field modulation composite motor as described above, the outer rotor is made of neodymium iron boron material.

[0014] In the dual-stator dual-rotor magnetic field modulation composite motor as described above, the radians of the outer stator teeth are equal, and the radians of the inner stator teeth are equal.

[0015] In the dual-stator dual-rotor magnetic field modulation composite motor as described above, the arc angles of the slots of the outer tooth slots are equal, and the arc angles of the slots of the inner tooth slots are equal.

[0016] In the dual-stator, dual-rotor magnetic field modulation composite motor described above, the relationship between the number of pole pairs and teeth of the outer stator and the number of pole pairs of the outer rotor satisfies the vernier modulation calculation model. The relationship between the number of pole pairs of the inner stator and the number of poles of the inner rotor and the number of pole pairs of the outer rotor satisfies the magnetic gear modulation calculation model.

[0017] In the dual-stator dual-rotor magnetic field modulation composite motor as described above, the vernier modulation calculation model is:

[0018] N ro =N so ±p so

[0019] Among them, N so is the number of teeth of the outer stator, N ro is the number of pole pairs of the outer rotor, p so is the number of pole pairs of the outer armature winding.

[0020] In the dual-stator dual-rotor magnetic field modulation composite motor as described above, the magnetic gear modulation calculation model is:

[0021] N ro =N ri ±p si

[0022] Among them, N riis the number of poles of the inner rotor, p si is the number of pole pairs of the inner armature winding.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] The dual-stator dual-rotor magnetic field modulation composite motor of the present invention combines a dual-stator and dual-rotor topology and utilizes the magnetic field modulation principle to achieve high torque density and high efficiency output under medium and low speed operation, making it suitable for the field of direct drive systems.

[0025] The dual-stator dual-rotor magnetic field modulation composite motor of the present invention combines the outer vernier motor with the inner magnetic gear motor by sharing a magnetic tuning ring, achieving dual-port electrical input and dual-mechanical port high-torque output, providing higher flexibility and reliability for motor operation, and expanding the application range of magnetic field modulation motors.

[0026] The dual-stator dual-rotor magnetic field modulation composite motor of the present invention has relatively simple structures of the inner rotor and the outer rotor, and does not require a rotor yoke structure, which greatly improves the space utilization of the motor;

[0027] In the dual-stator dual-rotor magnetic field modulation composite motor of the present invention, both the inner armature winding and the outer armature winding are single-layer windings. Compared with the double-layer windings, the single-layer windings eliminate some slot wedges and isolation spaces, reduce production difficulty, and effectively improve the slot fill rate of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0029] Figure 1 It is a structural schematic diagram of the dual-stator dual-rotor magnetic field modulation composite motor of the present invention;

[0030] Figure 2 This is the magnetic flux distribution diagram of the dual-stator dual-rotor magnetic field modulation compound motor;

[0031] Figure 3 It is a structural diagram of the outer stator;

[0032] Figure 4 It is a structural diagram of the inner stator;

[0033] Figure 5 It is a schematic diagram of the structure and magnetization direction of the outer rotor;

[0034] Figure 6 It is a structural diagram of the inner rotor;

[0035] Figure 7A and Figure 7BThis is a waveform diagram of the three-phase back electromotive force (A, B, and C) of the outer armature winding and the inner armature winding of the dual-stator dual-rotor magnetic field modulation composite motor of the present invention;

[0036] Figure 8 It is a waveform diagram of the electromagnetic torque of the inner rotor and the outer rotor of the dual-stator dual-rotor magnetic field modulation composite motor of the present invention.

[0037] Description of Figure Numbers:

[0038] 1. External stator; 11. External stator core; 12. External stator teeth; 13. External tooth slots; 14. External armature winding;

[0039] 2. Outer rotor; 21. First permanent magnet; 22. Second permanent magnet;

[0040] 3. Inner rotor; 31. Magnetic block core;

[0041] 4. Inner stator; 41. Inner stator core; 42. Inner stator teeth; 43. Inner tooth slots; 44. Inner armature winding. DETAILED DESCRIPTION

[0042] To provide a clearer understanding of the technical solutions, objectives, and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings. The use of the adjective or adverbial modifiers "inside" and "outside" is intended solely to facilitate relative reference between multiple groups of terms and does not describe any specific directional restrictions on the modified terms. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0043] like Figure 1 As shown, the present invention provides a dual-stator dual-rotor magnetic field modulation composite motor, which includes an outer stator 1, an outer rotor 2, an inner rotor 3 and an inner stator 4, wherein:

[0044] like Figure 3 As shown, the outer stator 1 includes an outer stator core 11, which is annular. The inner circumference of the outer stator core 11 is evenly distributed with a plurality of radially extending outer stator teeth 12, that is, the plurality of outer stator teeth 12 are evenly spaced along the circumference of the outer stator core 11, and an outer tooth slot 13 is formed between two adjacent outer stator teeth 12. Preferably, the outer tooth slot 13 is an open slot; an outer armature winding 14 is wound around the outer stator teeth 12, and the outer armature winding 14 is accommodated in the outer tooth slot 13. Specifically, as shown in FIG. Figure 3In the illustrated embodiment, the outer diameter R1 of the outer stator core 11 is 150 mm, the distance between the inner end surface of the outer stator tooth 12 and the center of the circle is 104.5 mm, the width W1 of the outer stator tooth 12 is 13.2 mm, the slot bottom thickness H of the outer tooth slot 13 is 11 mm, and the angle α between the centerline of adjacent outer stator teeth 12 and the centerline of the outer tooth slot 13 is 7.5°. The specific dimensions of each component can be adjusted according to actual usage requirements.

[0045] like Figure 1 As shown, the outer rotor 2 is sandwiched between the outer stator 1 and the inner rotor 3, and air gaps are provided between the outer rotor 2 and the outer stator 1 as well as between the outer rotor 2 and the inner rotor 3; Figure 5 As shown, the outer rotor is annular, and the outer rotor 2 includes a plurality of first permanent magnets 21 and second permanent magnets 22 arranged alternately; the magnetization directions of the first permanent magnets 21 and the second permanent magnets 22 are opposite, specifically, as shown in FIG. Figure 5 As shown, the magnetization direction of the first permanent magnet 21 is radially outward, and the magnetization direction of the second permanent magnet 22 is radially inward; and Figure 5 In the illustrated embodiment, the outer rotor 2 has a total of 11 first permanent magnets 21 and 11 second permanent magnets 22, that is, the outer rotor 2 has 22 poles, and the central angle A1 of the first permanent magnet 21 and the second permanent magnet 22 is 16.4°. The inner diameter r3 of the first permanent magnet 21 and the second permanent magnet 22 is 94.2 mm, and the outer diameter R3 of the first permanent magnet 21 and the second permanent magnet 22 is 104 mm.

[0046] like Figure 1 As shown, the inner rotor 3 is sandwiched between the outer rotor 2 and the inner stator 4, and air gaps are provided between the inner rotor 3 and the outer rotor 2 as well as between the inner rotor 3 and the inner stator 4; Figure 6 As shown, the inner rotor 3 includes a plurality of magnetic adjustment block cores 31 arranged at intervals. Specifically, as shown in FIG. Figure 6 As shown, the central angle A2 of each magnetic tuning core 31 is 12.8°, the outer diameter R4 of each magnetic tuning core 31 is 93.7 mm, the inner diameter r4 of each magnetic tuning core 31 is 83 mm, and the arc ratio between each magnetic tuning core 31 and the gap adjacent to it is 0.86:1, so as to optimize the output torque performance;

[0047] like Figure 1 As shown, the inner stator 4 is arranged inside the inner rotor 3, and the inner stator 4 includes an inner stator core 41. Figure 4As shown, the inner stator core 41 is annular, and a plurality of inner stator teeth 42 are evenly distributed on the outer circumference of the inner stator core 41, that is, the plurality of inner stator teeth 42 are evenly spaced along the circumference of the inner stator core 41, and the number of the inner stator teeth 42 is the same as the number of the outer stator teeth 12, and the position of each inner stator tooth 42 corresponds to that of each outer stator tooth 12. An inner tooth slot 43 is formed between two adjacent inner stator teeth 42. Preferably, the inner tooth slot 43 is a semi-closed slot. The inner armature winding 44 is wound around the inner stator teeth 42, and the inner armature winding 44 is accommodated in the inner tooth slot 43. Specifically, as shown in FIG. Figure 4 In the illustrated embodiment, the outer diameter R2 of the inner stator core 41 is 82.5 mm, the inner diameter r2 of the inner stator core 41 is 27 mm, the length L2 of the inner stator teeth 42 is 33.1 mm, the distance L3 between the inner end surface and the center of the inner slot 43 is 40.5 mm, the width W2 of the inner stator teeth 42 is 7 mm, and the angle β between the centerline of adjacent inner stator teeth 42 and the centerline of the inner slot 43 is 7.5°.

[0048] The dual-stator dual-rotor magnetic field modulation composite motor of the present invention combines the dual-stator topology structure with the vernier magnetic gear effect, can achieve large torque output at both ends under medium and low speed operation, and has the characteristics of high efficiency, high reliability and high flexibility, and is suitable for the field of direct drive systems.

[0049] Furthermore, the slot fill rates of the outer armature winding 14 in the outer slots 13 of the outer stator 1 and the inner armature winding 44 in the inner slots 43 of the inner stator 4 are both less than or equal to 70%, to ensure that the windings can be kept as far away from the air gap edge as possible during winding to prevent AC losses such as skin effect and proximity effect.

[0050] Furthermore, the air gap lengths between the outer stator 1 and the outer rotor 2, between the outer rotor 2 and the inner rotor 3, and between the inner rotor 3 and the inner stator 4 are equal. Preferably, the air gap lengths between the outer stator 1 and the outer rotor 2, between the outer rotor 2 and the inner rotor 3, and between the inner rotor 3 and the inner stator 4 are all 0.5 mm.

[0051] Furthermore, in order to meet the armature winding pole pair number required for modulation, the outer armature winding 14 is a single-layer concentrated winding, and the inner armature winding 44 is a single-layer distributed winding. Compared with the double-layer winding, the single-layer concentrated winding eliminates some slot wedges and isolation space, reduces production difficulty, and effectively improves the slot fill rate of the motor.

[0052] Furthermore, the outer stator core 11, the magnetic tuning block core 31 and the inner stator core 41 are all formed by laminating silicon steel sheets, and the outer rotor 2 is made of neodymium iron boron material to facilitate the operation of the dual-stator dual-rotor magnetic field modulation composite motor.

[0053] Furthermore, the radians of the outer stator teeth 12 and the inner stator teeth 42 are equal, so as to maintain the consistency of the motor structure and performance.

[0054] In one embodiment of the present invention, the relationship between the number of pole pairs of the outer stator 1, the number of pole pairs of the outer rotor 2, the number of pole pairs of the inner rotor 3 and the number of pole pairs of the inner stator 4 satisfies the vernier modulation and magnetic gear modulation calculation models, so that the motor can operate well under medium and low speed and high torque conditions.

[0055] Furthermore, the vernier modulation calculation model is:

[0056] N ro =N so ±p so

[0057] Among them, N so is the number of teeth of outer stator 1, N ro is the number of pole pairs of the outer rotor 2, p so is the number of pole pairs of the outer armature winding 14 .

[0058] The magnetic gear modulation calculation model is:

[0059] N ro =N ri ±p si

[0060] Among them, N ri is the number of poles of the inner rotor 3, p si is the number of pole pairs of the inner armature winding 44 .

[0061] According to relevant application and performance requirements, the number of teeth of the outer stator teeth 12 is 24, the number of pole pairs of the outer armature winding 14 is 13, the number of pole pairs of the outer rotor 2 is 11, the number of poles of the inner rotor 3 is 13, and the number of pole pairs of the inner armature winding 44 is 2.

[0062] further, Figure 2 This is the magnetic flux distribution diagram of the dual-stator dual-rotor magnetic field modulation composite motor of the present invention, as shown in FIG. Figure 2 As shown, the magnetic flux distribution indicates that the inner armature winding 44 has a pole pair number of 2, while the outer rotor 2 has a pole pair number of 11 and the inner rotor 3 has a pole pair number of 13. The proposed dual-stator, dual-rotor magnetic field modulation composite motor's modulation ring (inner rotor 3) structure modulates the low-pole-pair-number armature magnetic field of the inner stator 4, generating a harmonic magnetic field component that matches the high-pole-pair-number permanent magnet magnetic field. This approach achieves the requirements for medium- and low-speed, high-torque operation. Similarly, the outer armature winding 14 has a pole pair number of 13. The proposed magnetic field modulation motor's modulation tooth (outer stator tooth 12) structure modulates the low-pole-pair-number armature magnetic field of the outer stator 1, generating a harmonic magnetic field component that matches the high-pole-pair-number permanent magnet magnetic field (first permanent magnet 21), thereby achieving high-density output of the outer rotor torque.

[0063] further, Figure 7A and Figure 7B This is a waveform diagram of the three-phase back electromotive force of the outer armature winding and the inner armature winding of the dual-stator dual-rotor magnetic field modulation composite motor of the present invention, as shown in FIG. Figure 7A and Figure 7B As shown, the three-phase symmetry of the outer and inner back electromotive force waveforms is shown. When the speed of the inner rotor 3 is 1000 r / min and the speed of the outer rotor 2 is 2000 r / min, the effective values ​​of the inner armature winding 44 and the outer armature winding 14 are 5870 V and 1410 V respectively, and the performance meets the requirements of related applications.

[0064] further, Figure 8 This is the electromagnetic torque waveform diagram of the inner rotor and outer rotor of the dual-stator dual-rotor magnetic field modulation composite motor of the present invention. The process of forming the electromagnetic torque waveform of the inner rotor 3 and the outer rotor 2 is as follows: the inner armature winding 44 and the outer armature winding 14 are respectively supplied with three-phase sinusoidal alternating current with a frequency of 155Hz and 369Hz, and the rotating magnetic field drives the inner rotor 3 and the outer rotor 2 to rotate, with speeds of 1000r / min and 2000r / min respectively. Among them, the armature magnetic field of the inner stator 4 with a low pole pair number is modulated by the modulation ring (inner rotor 3) structure of the proposed dual-stator dual-rotor magnetic field modulation composite motor, and a harmonic magnetic field component that matches the magnetic field of the permanent magnet with a high pole pair number is obtained to form an internal electromagnetic torque waveform. Similarly, the armature magnetic field of the outer stator 1 with a low pole pair number is modulated by the modulation tooth (outer stator tooth 12) structure of the proposed magnetic field modulation motor, and a harmonic magnetic field component that matches the magnetic field of the permanent magnet with a high pole pair number (first permanent magnet 21) is obtained, and then the external electromagnetic torque waveform is obtained. As shown Figure 8 As shown, the average electromagnetic torques of the outer rotor 2 and the inner rotor 3 reach 886 Nm and 359 Nm, respectively, so that their performance meets the requirements of relevant applications and can operate well under medium and low speed and high torque conditions.

[0065] In summary, the dual-stator dual-rotor magnetic field modulation composite motor of the present invention combines dual-stator and dual-rotor topologies and utilizes the magnetic field modulation principle to achieve high torque density and high efficiency output under medium and low speed operation, making it suitable for the field of direct drive systems.

[0066] The dual-stator dual-rotor magnetic field modulation composite motor of the present invention combines the outer vernier motor with the inner magnetic gear motor by sharing a magnetic tuning ring, achieving dual-port electrical input and dual-mechanical port high-torque output, providing higher flexibility and reliability for motor operation, and expanding the application range of magnetic field modulation motors.

[0067] The dual-stator dual-rotor magnetic field modulation composite motor of the present invention has relatively simple structures of the inner rotor and the outer rotor, and does not require a rotor yoke structure, which greatly improves the space utilization of the motor;

[0068] In the dual-stator dual-rotor magnetic field modulation composite motor of the present invention, both the inner armature winding and the outer armature winding are single-layer windings. Compared with the double-layer windings, the single-layer windings eliminate some slot wedges and isolation spaces, reduce production difficulty, and effectively improve the slot fill rate of the motor.

[0069] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention. It should also be noted that the various components of the present invention are not limited to the above-mentioned overall application. The various technical features described in the specification of the present invention can be selected one by one or multiple features can be used in combination according to actual needs. Therefore, the present invention naturally covers other combinations and specific applications related to the invention point of this case.

Claims

1. A dual-stator dual-rotor magnetic field modulation composite motor, characterized in that: The dual-stator dual-rotor magnetic field modulation composite motor comprises: An outer stator, comprising an outer stator core, wherein the inner circumference of the outer stator core is uniformly distributed with a plurality of radially extending outer stator teeth, an outer tooth slot is formed between two adjacent outer stator teeth, and an outer armature winding is wound around the outer stator teeth; an outer rotor disposed inside the outer stator, the outer rotor comprising a permanent magnet ring consisting of a plurality of alternating first permanent magnets and second permanent magnets, wherein the curvature of each first permanent magnet and each second permanent magnet is the same, and the magnetization directions of the first permanent magnet and the second permanent magnet are opposite; an inner rotor disposed inside the outer rotor, the inner rotor comprising a modulation ring composed of a plurality of magnetic modulation cores, with a gap between adjacent magnetic modulation cores, and an arc ratio between each magnetic modulation core and the gap adjacent to it being 0.86:1; an inner stator disposed within the inner rotor, the inner stator comprising a stator core, the outer circumference of the inner stator core being uniformly distributed with a plurality of radially extending inner stator teeth, the inner armature winding being wound around the inner stator teeth, an inner tooth slot being formed between two adjacent inner stator teeth, the inner tooth slot being a semi-closed slot, the number of the inner stator teeth being the same as the number of the outer stator teeth, and the positions of the inner stator teeth corresponding one-to-one with the outer stator teeth; The relationship between the number of pole pairs and teeth of the outer stator and the number of pole pairs of the outer rotor satisfies the vernier modulation calculation model; the relationship between the number of pole pairs of the inner stator and the number of poles of the inner rotor and the number of pole pairs of the outer rotor satisfies the magnetic gear modulation calculation model; The vernier modulation calculation model is: N ro =N so ±p so Among them, N so is the number of teeth of the outer stator, N ro is the number of pole pairs of the outer rotor, p so is the number of pole pairs of the outer armature winding; The magnetic gear modulation calculation model is: N ro =N ri ±p si Among them, N ri is the number of poles of the inner rotor, p si is the number of pole pairs of the inner armature winding.

2. The dual-stator dual-rotor magnetic field modulation composite motor according to claim 1, characterized in that: The slot filling rates of the outer armature winding and the inner armature winding are both less than or equal to 70%.

3. The dual-stator dual-rotor magnetic field modulation composite motor according to claim 1, characterized in that: The air gap length between the outer stator and the outer rotor, the air gap length between the outer rotor and the inner rotor, and the air gap length between the inner rotor and the inner stator are equal.

4. The dual-stator dual-rotor magnetic field modulation composite motor according to claim 1, characterized in that: The outer armature winding is a single-layer concentrated winding, and the inner armature winding is a single-layer distributed winding.

5. The dual-stator dual-rotor magnetic field modulation composite motor according to claim 1, characterized in that: The outer stator core, the magnetic tuning block core and the inner rotor core are all formed by laminating silicon steel sheets.

6. The dual-stator dual-rotor magnetic field modulation composite motor according to claim 1, characterized in that: The outer rotor is made of neodymium iron boron material.

7. The dual-stator dual-rotor magnetic field modulation composite motor according to claim 1, characterized in that: The radians of the outer stator teeth are equal, and the radians of the inner stator teeth are equal.

8. The dual-stator dual-rotor magnetic field modulation composite motor according to claim 1, characterized in that: The arcs of the slots of the outer tooth grooves are equal, and the arcs of the slots of the inner tooth grooves are equal.

Images