A magnetic concentration type stator permanent magnet high speed flywheel motor

Abstract

A kind of magnetic type stator permanent magnet high-speed flywheel motor, belong to high-speed motor technical field.To solve the problems of poor rotor strength, large operating loss and low power density of existing high-speed motor, it includes outer rotor and inner stator, the inner stator includes main permanent magnet, auxiliary permanent magnet, stator core and armature winding;The stator core is provided with main armature tooth and auxiliary armature tooth, a pair of main permanent magnet is built-in on a main armature tooth, the outer edge of main armature tooth is parallel with main permanent magnet;Auxiliary armature tooth is the protruding part on both sides of main armature tooth, auxiliary permanent magnet is embedded on the side step formed by main armature tooth and auxiliary armature tooth;Auxiliary permanent magnet is distributed on both sides of main permanent magnet;Armature winding is wound on main armature tooth;Main permanent magnet is magnetized by parallel magnetization method with opposite magnetization direction, forming "V" type magnetic circuit;Auxiliary permanent magnet is magnetized by parallel magnetization method with opposite magnetization direction.The application is used for flywheel system.

Description

TECHNICAL FIELD

[0001] The application relates to a magnetic-concentrating stator permanent-magnet type high-speed flywheel motor and belongs to the technical field of high-speed motors. BACKGROUND

[0002] Energy storage technology is very important for building a safe, efficient and sustainable energy network, and is the key to addressing energy challenges and achieving energy security. Flywheel energy storage systems play a prominent role in modern power systems and new energy fields due to their high power density, long cycle life, high environmental performance and low operating cost.

[0003] As the core of energy conversion of the flywheel system, the performance of the high-speed motor directly affects the operation of the entire system. For example:

[0004] First, the high-frequency magnetic field generated by the high-speed rotor rotation produces high-frequency losses at the core, winding and permanent magnet, and the restriction of the vacuum environment makes heat dissipation extremely difficult, resulting in motor rotor temperature rise, and excessive temperature rise will cause demagnetization and exceed the insulation level range.

[0005] Second, when the high-speed motor operates at the rated operating condition, the strong centrifugal force may cause the permanent magnet to fall off and break, and the system may resonate under the influence of the critical speed, which may cause damage to the system.

[0006] In summary, there are many key technical problems in the current high-speed flywheel motor system, which limits its engineering application. SUMMARY

[0007] The application aims to solve the problems of poor rotor strength, high operating loss and low power density of the existing high-speed motor, and provides a magnetic-concentrating stator permanent-magnet type high-speed flywheel motor.

[0008] The magnetic-concentrating stator permanent-magnet type high-speed flywheel motor comprises an outer rotor and an inner stator, and the inner stator comprises main permanent magnets, auxiliary permanent magnets, a stator core and an armature winding.

[0009] The stator core is provided with main armature teeth and auxiliary armature teeth, a pair of main permanent magnets is built in one main armature tooth, and the outer edge of the main armature tooth is parallel to the main permanent magnet; the auxiliary armature teeth are protruding parts on both sides of the main armature teeth, the auxiliary permanent magnets are embedded on the side steps formed by the main armature teeth and the auxiliary armature teeth; the auxiliary permanent magnets are distributed on both sides of the main permanent magnets; and the armature winding is wound on the main armature teeth.

[0010] The main permanent magnets are magnetized in a parallel magnetization mode with opposite magnetization directions to form a V-shaped magnetic-concentrating magnetic circuit; and the auxiliary permanent magnets are magnetized in a parallel magnetization mode with opposite magnetization directions.

[0011] Preferably, it further comprises a rotating flywheel, which is arranged outside the outer rotor and is attached to the core of the outer rotor to form a rotor structure.

[0012] Preferably, the armature winding adopts concentrated winding.

[0013] Preferably, the outer rotor is 16-pole and the inner stator is 6-slot, forming a pole-slot matching mode.

[0014] Preferably, the outer rotor comprises 16 rotor teeth, adopts salient pole structure, and the protruding part and the recessed part have an angle difference and are uniformly distributed.

[0015] Preferably, the main armature tooth is 6, the auxiliary armature tooth is 12, the main permanent magnet is 6 pairs, the auxiliary permanent magnet is 6 pairs, and the armature winding is 12.

[0016] 6 pairs of main permanent magnets are arranged in a "V" shape and embedded in 6 main armature teeth respectively, and 6 pairs of auxiliary permanent magnets are embedded with 12 auxiliary armature teeth respectively; 12 armature windings are wound on 6 main armature teeth to form double-layer three-phase distributed concentrated winding in 6 slots.

[0017] Preferably, the pair of main permanent magnets embedded in the same main armature tooth is magnetized by a parallel magnetization method with opposite magnetization, and the magnetization angle is perpendicular to the main permanent magnet.

[0018] The auxiliary permanent magnets on both sides of the same main armature tooth are magnetized along the length direction of the main permanent magnet, and the magnetization directions of the auxiliary permanent magnets on both sides of the same main armature tooth are opposite.

[0019] Preferably, the armature winding comprises an A-phase positive coil, an A-phase negative coil, a B-phase positive coil, a B-phase negative coil, a C-phase positive coil and a C-phase negative coil.

[0020] The windings on the opposite sides are mirror-symmetric.

[0021] The A-phase positive coil and the A-phase negative coil are connected in series to form an A-phase armature winding.

[0022] The B-phase positive coil and the B-phase negative coil are connected in series to form a B-phase armature winding.

[0023] The C-phase positive coil and the C-phase negative coil are connected in series to form a C-phase armature winding.

[0024] The spatial positions of the three-phase armature windings are different by 120 degrees.

[0025] Preferably, the stator core adopts super silicon steel sheet with a thickness of 0.1mm or 0.15mm.

[0026] Preferably, the main permanent magnet and the auxiliary permanent magnet are segmented in the axial direction.

[0027] The main permanent magnet and the auxiliary permanent magnet are made of ferrum-boron.

[0028] The application has the advantages that the application provides a new topology structure of high-speed flywheel motor with high rotor strength, low operation loss and high power density, which solves the technical problems of high rotor strength and high temperature rise of the high-speed flywheel motor in a vacuum environment while improving the power density of the high-speed flywheel motor.

[0029] 1. The rotor structure is simple, the rotor strength is high, the sheath is not needed to ensure the rotor strength, the air gap length is shortened, and the output torque and power density are improved.

[0030] 2. The stator core is composed of main armature teeth and auxiliary armature teeth, the main armature teeth are wound with windings, the auxiliary armature teeth can effectively increase the convenience of winding and prevent the windings from falling out, and the auxiliary armature teeth provide an auxiliary magnetic flux return circuit, reduce the slot opening width, increase the equivalent air gap length, reduce the torque ripple and improve the output power.

[0031] 3. The main permanent magnet and the auxiliary permanent magnet are used to jointly act, the main permanent magnet is a pair of parallel magnetized permanent magnets with opposite magnetization, there is an included angle between the main permanent magnets, the main permanent magnets are in a V shape, the opposite magnetization forms a magnetic concentration effect, and the power density is improved. The auxiliary permanent magnet is a pair of parallel magnetized permanent magnets with opposite magnetization directions, the waveform of the main magnetic field can be improved, the air gap magnetic flux distortion rate can be reduced, the eddy current loss can be reduced, the torque ripple can be reduced, the heat generation of the motor can be inhibited, the magnetic field amplitude can be improved, the magnetic concentration effect can be increased, and the power density of the motor can be improved.

[0032] 4. The pole-slot matching mode of 6-slot 16-pole is used, which is different from the traditional I-type permanent magnet, the winding area is increased, higher torque is provided under the same current density, the windings have complementarity under the pole-slot matching mode, the asymmetric flux linkage and back electromotive force caused by a single coil are eliminated by complementary coils, the positioning torque is effectively reduced, and the motor torque ripple is reduced.

[0033] 5. The stator permanent magnet type structure is used, the rotor is only a silicon steel sheet, which is a single structure and a single material, there is no permanent magnet or winding, the rotor strength is improved, the loss generation is inhibited, and the high-speed operation is suitable.

[0034] 6. The stator core and the rotor core are made of super-thin super silicon steel sheets, the generation of the motor core loss is effectively inhibited, the motor temperature rise is inhibited, and the system efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structure diagram of the magnetic concentration type stator permanent magnet type high-speed flywheel motor according to the application;

[0036] Figure 2is an axial view of a magnetic concentration type stator permanent magnet type high-speed flywheel motor according to the present application;

[0037] Figure 3 is a magnetizing direction diagram of the main permanent magnet and the auxiliary permanent magnet according to the present application;

[0038] Figure 4 is a flux line trend diagram of the main permanent magnet according to the present application;

[0039] Figure 5 is a flux line trend diagram of the auxiliary permanent magnet according to the present application;

[0040] Figure 6 is a magnetic force line distribution diagram of the main permanent magnet according to the present application;

[0041] Figure 7 is a magnetic force line distribution diagram of the auxiliary permanent magnet according to the present application;

[0042] Figure 8 is a magnetic force line distribution diagram of the rotor and the stator when running at no load;

[0043] Figure 9 is a structural diagram of a 16-pole 6-slot magnetic concentration type stator permanent magnet type high-speed flywheel motor according to the present application. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0045] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0046] The present application will be further described below with reference to the drawings and specific embodiments, but is not limited by the embodiments.

[0047] Embodiment 1

[0048] The present application will be further described below with reference to the drawings and specific embodiments, but is not limited by the embodiments. Figures 1-9 The present application will be further described below with reference to the drawings and specific embodiments, but is not limited by the embodiments.

[0049] The stator core 5 is provided with main armature teeth 7 and auxiliary armature teeth 8, one pair of main permanent magnets 3 is built in one main armature tooth 7, and the outer edge of the main armature tooth 7 is parallel to the main permanent magnet 3; the auxiliary armature tooth 8 is a protruding part on both sides of the main armature tooth 7, and the auxiliary permanent magnet 4 is embedded on the side step formed by the main armature tooth 7 and the auxiliary armature tooth 8; the auxiliary permanent magnet 4 is distributed on both sides of the main permanent magnet 3; and the armature winding 6 is wound on the main armature tooth 7.

[0050] The main permanent magnet 3 is magnetized by using a parallel magnetization method with opposite magnetization directions, and forms a “V”-shaped magnetic circuit; and the auxiliary permanent magnet 4 is magnetized by using a parallel magnetization method with opposite magnetization directions.

[0051] Further, as shown in the figure, it further comprises a rotating flywheel 9, which is arranged on the outside of the outer rotor 1 and is attached to the core of the outer rotor 1 to form a rotor structure together. Figure 9

[0052] Further, the armature winding 6 adopts concentrated winding.

[0053] Further, the outer rotor 1 is 16-pole, and the inner stator 2 is 6-slot, forming a pole-slot matching mode.

[0054] Further, the outer rotor 1 comprises 16 rotor teeth, adopts a salient pole structure, and the protruding part and the recessed part have an angle difference and are uniformly distributed.

[0055] Further, the main armature tooth 7 is 6, the auxiliary armature tooth 8 is 12, the main permanent magnet 3 is 6 pairs, the auxiliary permanent magnet 4 is 6 pairs, and the armature winding 6 is 12.

[0056] The 6 pairs of main permanent magnets 3 are respectively built in the 6 main armature teeth 7 in a “V” shape, and the 6 pairs of auxiliary permanent magnets 4 are respectively embedded with the 12 auxiliary armature teeth 8; and the 12 armature windings 6 are respectively wound on the 6 main armature teeth 7 to form double-layer three-phase distributed concentrated winding in the 6 slots.

[0057] Further, the pair of main permanent magnets 3 built in the same main armature tooth 7 is magnetized by using a parallel magnetization method with opposite magnetization directions, and the magnetization angle is perpendicular to the main permanent magnet 3.

[0058] The auxiliary permanent magnets 4 on both sides of the same main armature tooth 7 are magnetized along the length direction of the main permanent magnet 3, and the magnetization directions of the auxiliary permanent magnets 4 on both sides of the same main armature tooth 7 are opposite.

[0059] Further, the armature winding 6 comprises an A-phase positive coil 61, an A-phase negative coil 62, a B-phase positive coil 63, a B-phase negative coil 64, a C-phase positive coil 65 and a C-phase negative coil 66.

[0060] ​The winding on the opposite side is mirror-symmetrical;

[0061] The A-phase positive pole coil 61 and the A-phase negative pole coil 62 are connected in series in the same direction, and constitute an A-phase armature winding;

[0062] The B-phase positive pole coil 63 and the B-phase negative pole coil 64 are connected in series in the same direction, and constitute a B-phase armature winding;

[0063] The C-phase positive pole coil 65 and the C-phase negative pole coil 66 are connected in series in the same direction, and constitute a C-phase armature winding;

[0064] The spatial positions of the three-phase armature windings are different by 120 degrees.

[0065] Further, the stator core 5 is made of super silicon steel sheet with a thickness of 0.1mm or 0.15mm.

[0066] In the embodiment, the stator is of a permanent magnet type structure, and the rotor is only made of silicon steel sheet, which is of a single structure and single material, and does not have permanent magnet or winding, so that the strength of the rotor is improved, and the loss is inhibited, and the high-speed operation is suitable. The stator core 5 is made of super-thin super silicon steel sheet, so that the generation of the motor core loss is effectively inhibited, the temperature rise of the motor is inhibited, and the system efficiency is improved.

[0067] Further, the main permanent magnet 3 and the auxiliary permanent magnet 4 are segmented in the axial direction.

[0068] The main permanent magnet 3 and the auxiliary permanent magnet 4 are both made of ferrum-boron.

[0069] In the embodiment, the eddy current loss is reduced by the axial segmentation.

[0070] In the application, the motor includes an outer rotor 1 and an inner stator 2, and the stator is composed of a main permanent magnet 3, an auxiliary permanent magnet 4, a stator core 5 and an armature winding 6. The stator core 5 is provided with a main armature tooth 7 and an auxiliary armature tooth 8, the main armature tooth 7 is embedded with a pair of main permanent magnets 3, and the auxiliary armature tooth 8 is embedded with a pair of auxiliary permanent magnets 4. The main permanent magnet 3 is of parallel magnetization with opposite magnetization, and forms a V-shaped magnetic gathering type, and the auxiliary permanent magnet 4 is of parallel magnetization with opposite magnetization directions. The armature winding 6 is of concentrated winding and is wound on the main armature tooth 7.

[0071] In the application, as shown in Figure 9 , it is a 16-pole 6-slot magnetic gathering type stator permanent magnet high-speed flywheel motor, and as shown in Figure 1 and Figure 9As shown, the motor outer rotor 1 of the application has 16 rotor teeth 16, adopts salient pole structure, the angle difference exists between the convex part and the concave part, and they are uniformly distributed. The stator 2 has 6 main armature teeth 7 and 12 auxiliary armature teeth 8. 6 pairs of main permanent magnets 3 are embedded in the main armature teeth 7 in V-shaped form, 6 pairs of auxiliary permanent magnets 4 are embedded with the auxiliary armature teeth 8, and the auxiliary permanent magnets 4 are distributed on both sides of the main permanent magnets 3. 12 armature windings 6 are wound on the main armature teeth 7, and double-layer three-phase distributed concentrated windings are formed in 6 slots. The rotating flywheel 9 is on the outside of the motor, and the rotating flywheel 9 is attached to the outer rotor core 1 to form a rotor structure.

[0072] As shown, Figure 2 The stator 2 has 12 armature windings 6, which are A-phase positive coil 61, A-phase negative coil 62, B-phase positive coil 63, B-phase negative coil 64, C-phase positive coil 65, and C-phase negative coil 66, respectively. The opposite winding is mirror-symmetrical. The mirror-symmetrical winding is forwardly connected in series, the magnetic flux has complementarity, constitutes the A-phase armature winding, and offsets a large number of harmonics. The B-phase and C-phase coils are arranged in the same way, and the spatial positions of the three-phase armature windings are different by 120 degrees.

[0073] As shown, Figure 3 The stator core 2 is provided with 12 main permanent magnets 3 and 12 auxiliary permanent magnets 4, respectively. The main permanent magnets 3 embedded in the same main armature tooth 7 adopt parallel magnetization with opposite magnetization, and the magnetization angle is perpendicular to the main permanent magnet 3. The auxiliary permanent magnet 4 is embedded with the auxiliary armature tooth 8 on both sides of the same main armature tooth 7, and the magnetization direction of the auxiliary permanent magnet 4 is along the length direction of the main permanent magnet, and the directions of the two sides are opposite.

[0074] As shown, Figure 4 and Figure 5 The running principle of the motor of the application is shown. When the rotor salient pole is respectively relative to the main permanent magnet 3 and the adjacent stator core 2, the magnetic flux direction inside the middle coil is downward; when the rotor salient pole is respectively relative to the stator core 2 and the adjacent main permanent magnet 3, the magnetic flux direction inside the middle coil is upward; when the rotor salient pole is respectively relative to the auxiliary permanent magnet 4, the magnetic flux inside the left coil is formed by the rotor 1-left auxiliary permanent magnet 4-left auxiliary armature tooth 8-stator core 2-right auxiliary armature tooth 8-right auxiliary permanent magnet 4-rotor 1, and the direction is clockwise; when the rotor salient pole is respectively relative to the auxiliary permanent magnet 4, the magnetic flux inside the left coil is formed by the rotor 1-right auxiliary permanent magnet 4-right auxiliary armature tooth 8-stator core 2-left auxiliary armature tooth 8-left auxiliary permanent magnet 4-rotor 1, and the direction is counterclockwise.

[0075] The main permanent magnet 3 and the auxiliary permanent magnet 4 are used together in the application, the magnetic fluxes are superimposed, the air gap magnetic density is increased, the air gap magnetic field is increased, and the auxiliary magnetic field can optimize the main magnetic field.

[0076] AsFigure 6 、 Figure 7 and Figure 8 As shown in the figures, the magnetic lines of the present application follow the principle of minimum reluctance. The main permanent magnet 3 acts alone, and the magnetic lines are more; the auxiliary permanent magnet 4 acts alone, and the magnetic lines are sparse; under the joint action of the permanent magnets, the magnetic lines are more abundant, which shows that it has the effect of magnetic aggregation.

[0077] The high-speed motor of the present application can operate in motor mode and also in generator mode.

[0078] Although the present application has been described herein with respect to particular embodiments thereof, it is understood that those examples are merely illustrative of the principles and applications of the present application. It is therefore to be understood that numerous modifications can be made to the illustrative embodiments and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It is to be understood that different dependent claims and features described herein can be combined with each other in ways not explicitly described. It is also to be understood that features described in relation to one embodiment can be used in other embodiments.

Claims

1. A poly-magnetic stator permanent-magnetic high-speed flywheel motor, comprising an outer rotor (1) and an inner stator (2), the inner stator (2) comprising main permanent magnets (3), auxiliary permanent magnets (4), a stator core (5) and an armature winding (6); characterized in that the stator core (5) is provided with main armature teeth (7) and auxiliary armature teeth (8), a pair of main permanent magnets (3) is built in a main armature tooth (7), and the outer edge of the main armature tooth (7) is parallel to the main permanent magnet (3); the auxiliary armature tooth (8) is a protruding part on both sides of the main armature tooth (7), and the auxiliary permanent magnet (4) is embedded on the side step formed by the main armature tooth (7) and the auxiliary armature tooth (8); the auxiliary permanent magnets (4) are distributed on both sides of the main permanent magnets (3); and the armature winding (6) is wound on the main armature tooth (7); the main permanent magnets (3) are magnetized by using a parallel magnetization method with opposite magnetization directions, forming a "V"-shaped poly-magnetic magnetic circuit; and the auxiliary permanent magnets (4) are magnetized by using a parallel magnetization method with opposite magnetization directions.

2. A poly-magnetic stator permanent-magnet type high-speed flywheel motor according to claim 1, characterized in that, The poly-magnetic stator permanent-magnetic high-speed flywheel motor further comprises a rotating flywheel (9) arranged on the outside of the outer rotor (1) and attached to the core of the outer rotor (1) to form a rotor structure.

3. A poly-magnetic stator permanent-magnet type high-speed flywheel motor according to claim 1, characterized in that, The armature winding (6) is a concentrated winding.

4. The poly-magnetic stator permanent-magnet high-speed flywheel motor according to claim 1, characterized in that, The outer rotor (1) is 16-pole, and the inner stator (2) is 6-slot, forming a pole-slot matching mode.

5. A magnetic-concentrator stator permanent-magnet high-speed flywheel motor according to claim 4, characterized by The outer rotor (1) comprises 16 rotor teeth, adopts a salient pole structure, and the protruding part and the recessed part have an angle difference and are uniformly distributed.

6. A poly-magnetic stator permanent-magnet high-speed flywheel motor according to claim 4 or 5, characterized in that, The main armature teeth (7) are 6, the auxiliary armature teeth (8) are 12, the main permanent magnets (3) are 6 pairs, the auxiliary permanent magnets (4) are 6 pairs, and the armature winding (6) is 12. The 6 pairs of main permanent magnets (3) are in a "V"-shaped and are built in the 6 main armature teeth (7) respectively, the 6 pairs of auxiliary permanent magnets (4) are embedded with the 12 auxiliary armature teeth (8) respectively, and the 12 armature windings (6) are wound on the 6 main armature teeth (7) to form a double-layer three-phase distributed concentrated winding in the 6 slots.

7. A magnetic-concentrator stator permanent-magnet high-speed flywheel motor according to claim 6, characterized by The pair of main permanent magnets (3) built in the same main armature tooth (7) are magnetized by using a parallel magnetization method with opposite magnetization directions, and the magnetization angle is perpendicular to the main permanent magnet (3); The auxiliary permanent magnets (4) on both sides of the same main armature tooth (7) are magnetized along the length direction of the main permanent magnet (3), and the magnetization directions of the auxiliary permanent magnets (4) on both sides of the same main armature tooth (7) are opposite.

8. A magnetic-concentrator stator permanent-magnet high-speed flywheel motor according to claim 6, characterized by The armature winding (6) comprises an A-phase positive coil (61), an A-phase negative coil (62), a B-phase positive coil (63), a B-phase negative coil (64), a C-phase positive coil (65) and a C-phase negative coil (66); The windings on the opposite sides are mirror-symmetrical; The A-phase positive coil (61) and the A-phase negative coil (62) are connected in series to form an A-phase armature winding; The B-phase positive coil (63) and the B-phase negative coil (64) are connected in series to form a B-phase armature winding; The C-phase positive coil (65) and the C-phase negative coil (66) are connected in series to form a C-phase armature winding; The spatial positions of the three-phase armature windings are different by 120 degrees.

9. The magnetic-concentrator stator permanent-magnet high-speed flywheel motor of claim 1, wherein, The stator core (5) is made of super silicon steel sheet with a thickness of 0.1mm or 0.15mm.

10. The magnetic-concentrator stator permanent-magnet high-speed flywheel motor of claim 1, wherein, The main permanent magnet (3) and the auxiliary permanent magnet (4) are segmented in the axial direction. The main permanent magnet (3) and the auxiliary permanent magnet (4) are made of R-Fe-B.

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