A direct current bias type wide speed regulation double-stator variable flux magnetic field modulation motor

Abstract

This invention belongs to the field of magnetic field modulation permanent magnet motor technology, specifically disclosing a DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor. The motor adopts a dual-stator structure, where both the inner and outer stators employ an asymmetric alternating pole permanent magnet array of "Fe-NFeN-Fe," effectively reducing permanent magnet leakage. The armature winding of the outer stator uses DC-biased AC current, the DC component of which enables dynamic adjustment of the air gap magnetic field. By employing the aforementioned special "Fe-NFeN-Fe" asymmetric permanent magnet array, combined with the application of DC currents of different polarities, this invention cleverly achieves coil flux polarity transformation, thereby effectively realizing magnetic field modulation and expanding the motor's speed range. Furthermore, by adding an inner stator to participate in electromagnetic energy conversion, and utilizing the synergistic enhancement of the dual magnetic field modulation effect generated by the modulation of the magnetic fields of the inner and outer stator permanent magnets by the rotor iron poles, this invention significantly improves the motor's torque output capability.

Description

Technical Field

[0001] This invention belongs to the field of magnetic field modulation permanent magnet motor technology, and specifically relates to a DC biased wide speed regulation dual stator variable flux magnetic field modulation motor, which is particularly suitable for wide speed regulation direct drive application scenarios such as electric vehicles and high-speed trains. Background Technology

[0002] Permanent magnet direct drive motors (PMDMs) have demonstrated significant application value in industrial fields due to their high efficiency, high reliability, and low noise and vibration. However, traditional PMDMs generally suffer from large size and low torque density, making the research of novel PMDMs with high torque density crucial. Against this backdrop, field-modulated permanent magnet motors (PMMs) have become a research focus due to their unique field modulation mechanism. This technology, by utilizing the harmonic effect of the air gap magnetic field, overcomes the traditional pole pair matching principle of PMDMs, achieving high torque output in a compact structure, and is therefore considered a highly promising direct drive solution.

[0003] For wide-speed-range direct-drive applications such as electric vehicles and high-speed trains, the main requirements for motors include high torque output in the low-speed constant torque region and a wide speed range in the constant power region. Traditional field-modulated permanent magnet motors are limited in their operating speed range in the constant power region due to the non-adjustable flux of the permanent magnet. To address this, a variable flux field-modulated permanent magnet motor with integrated DC excitation winding has been proposed, which can achieve dynamic control of the air gap magnetic field by adjusting the DC excitation current.

[0004] However, variable flux magnetic field modulated permanent magnet motors with integrated DC excitation windings face several challenges due to the placement of their armature and excitation windings on the same stator: firstly, the physical space competition between the windings leads to a synchronous decrease in torque output and magnetic field regulation capability; secondly, how to improve torque output performance in the low-speed range while maintaining magnetic field regulation capability. Solving these problems is of significant engineering value for advancing the practical application of this type of motor in direct drive applications. Summary of the Invention

[0005] In view of the above-mentioned technical problems existing in the prior art, the present invention proposes a DC biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor to improve the torque output capability under low-speed conditions, while effectively expanding the speed regulation range of the motor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor includes an outer stator, a rotor, and an inner stator;

[0008] The outer stator includes the outer stator yoke, the outer stator main teeth, and the outer stator auxiliary teeth;

[0009] The outer stator yoke is circular; there are multiple outer stator main teeth and outer stator auxiliary teeth, and the outer stator main teeth and outer stator auxiliary teeth are arranged alternately along the inner circumference of the outer stator yoke.

[0010] Two permanent magnets, separated by iron poles, are installed on each external stator main tooth;

[0011] The rotor is located between the outer stator and the inner stator;

[0012] The inner stator includes the inner stator yoke, the inner stator main teeth, and the inner stator auxiliary teeth;

[0013] The inner stator yoke is circular, and there are multiple inner stator main teeth and inner stator auxiliary teeth. The inner stator main teeth and inner stator auxiliary teeth are arranged alternately along the outer circumference of the inner stator yoke.

[0014] Two internal stator permanent magnets, separated by iron poles, are set on each internal stator main tooth;

[0015] Both the outer and inner stators are equipped with an asymmetric alternating pole permanent magnet array of "Fe-NFeN-Fe";

[0016] The outer stator main teeth are provided with an outer stator armature winding; the inner stator main teeth are provided with an inner stator armature winding; a DC bias AC current is passed through the outer stator armature winding, wherein the DC component contained in the DC bias AC current is used to achieve magnetization.

[0017] Preferably, the magnetic flux polarity of the coil is changed by passing DC currents of different polarities into the outer stator armature winding, thereby achieving magnetic adjustment; wherein, the DC currents of different polarities include positive DC current and negative DC current;

[0018] When a negative DC current is applied, as the rotor rotates, the magnetic flux change in the outer stator armature winding decreases, and the magnetic flux of the two coils that make up the outer stator armature winding becomes completely unipolar. The superposition of the magnetic flux of the two coils weakens the amplitude of the combined magnetic flux, and the back electromotive force and torque output generated by the outer stator armature winding also decrease accordingly. This is the weak magnetic state.

[0019] Conversely, when a positive DC current is applied, the magnetic flux in the outer stator armature winding increases as the rotor rotates, and the magnetic flux of the two coils that make up the outer stator armature winding exhibits bipolarity. The superposition of the magnetic flux of the two coils increases the amplitude of the combined magnetic flux, and the back electromotive force and torque output generated by the outer stator armature winding increase accordingly. This is the magnetization state.

[0020] Preferably, air gaps are provided between the outer stator and the rotor, and between the rotor and the inner stator.

[0021] Preferably, the rotor consists of multiple spaced rotor iron poles; no permanent magnets are installed on the rotor.

[0022] Preferably, both the outer stator permanent magnet and the inner stator permanent magnet are magnetized radially outward.

[0023] Preferably, alternating current is supplied to the inner stator armature winding.

[0024] Preferably, both the outer stator armature winding and the inner stator armature winding are concentrated windings.

[0025] Preferably, the outer end of the outer stator main tooth is connected to the inner side of the outer stator yoke, and the inner end of the outer stator main tooth extends to the outer side of the rotor; two permanent magnets separated by iron poles are provided at the inner end of the outer stator main tooth.

[0026] The two permanent magnets on the same external stator main tooth are arranged symmetrically about the center line of the external stator main tooth.

[0027] Preferably, the inner end of the inner stator main tooth is connected to the outer side of the inner stator yoke, and the outer end of the inner stator main tooth extends to the inner side of the rotor; two permanent magnets separated by iron poles are provided at the inner end of the inner stator main tooth.

[0028] The two permanent magnets on the same inner stator main tooth are arranged symmetrically about the center line of the inner stator main tooth.

[0029] Preferably, the outer ends of each outer stator auxiliary tooth are connected to the corresponding positions on the inner circumference of the outer stator yoke; the inner ends of each inner stator auxiliary tooth are connected to the corresponding positions on the outer circumference of the inner stator yoke.

[0030] The present invention has the following advantages:

[0031] As described above, this invention relates to a DC-biased, wide-range speed-regulating dual-stator variable flux magnetic field modulation motor. This motor employs a dual-stator structure, where stator auxiliary teeth on the inner and outer stators, along with stator main teeth containing two stator permanent magnets, are alternately arranged to form an asymmetric alternating pole permanent magnet array of "Fe-NFeN-Fe". Compared to the traditional "NS-NS" permanent magnet array and the symmetric alternating pole permanent magnet array "FeN-FeN", the "Fe-NFeN-Fe" asymmetric alternating pole permanent magnet array formed in this invention effectively reduces permanent magnet leakage flux. Furthermore, the stator auxiliary teeth can achieve phase-to-phase isolation, which is beneficial for improving fault tolerance and reliability. Furthermore, a DC-biased AC current (i.e., DC-biased three-phase current excitation) is passed through the outer stator armature winding. The AC component of the DC-biased AC current is used to achieve torque output, while the DC component enables dynamic adjustment of the air gap magnetic field, achieving wide-range, high-efficiency online flux control. This allows for effective magnetic adjustment without adding a DC excitation winding, effectively expanding the motor's speed range. Building upon this, the invention further fully utilizes the internal space of the motor, significantly increasing torque density by adding an inner stator to participate in electromagnetic energy conversion. Because the outer stator of this invention employs an asymmetric alternating pole permanent magnet array of "Fe-NFeN-Fe," and by passing DC currents of different polarities through the outer stator armature winding, the coil flux polarity can be cleverly reversed, effectively achieving magnetization or weakening of the motor. Therefore, it possesses unique advantages in magnetic adjustment performance, further expanding the motor's speed range. Furthermore, the magnetic fields of the inner and outer stator permanent magnets described in this invention, through the magnetic field modulation effect of the rotor iron poles, form a synergistically enhanced dual magnetic field modulation effect, which is beneficial for exciting abundant air gap magnetic field harmonic components, thereby significantly improving torque output capability. In addition, in this invention, the permanent magnets are all placed on the stator side, and there are no permanent magnets on the rotor side, which helps with heat dissipation of the permanent magnets. The motor proposed in this invention not only significantly improves torque output capability under low-speed conditions, but also effectively expands the speed range of the motor, providing an innovative solution with both high dynamic response and high-efficiency output for wide-speed-range direct-drive scenarios such as high-precision servo systems and electric vehicle drives. Attached Figure Description

[0032] Figure 1 This is a cross-sectional view of a DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor in an embodiment of the present invention; wherein Figure 1 The arrows in the image indicate the magnetization direction of the inner and outer stator permanent magnets;

[0033] Figure 2 This is a schematic diagram comparing the main magnetic flux and leakage flux paths of the "Fe-NFeN-Fe" asymmetric alternating pole permanent magnet arrangement used in the motor of this invention with those of the traditional "NS-NS" permanent magnet arrangement motor. Figure 2In the diagram, (a) represents a traditional "NS-NS" permanent magnet array; Figure 2 (b) in the figure represents the “Fe-NFeN-Fe” asymmetric alternating pole permanent magnet array proposed in this invention;

[0034] Figure 3 This is a schematic diagram of the unloaded magnetic field lines distribution of the motor in four typical positions in an embodiment of the present invention; Figure 3 (a), (b), (c), and (d) in the figure correspond to the distribution of unloaded magnetic field lines at 0°, 90°, 180°, and 270°, respectively.

[0035] Figure 4 This is a schematic diagram of the magnetic flux linkage of the outer stator Ao phase winding in an embodiment of the present invention;

[0036] Figure 5 To determine the external stator A under different DC currents in no-load conditions O + and A O - Schematic diagram of coil flux; Figure 5 (a), (b), and (c) in the figure show the cases of no DC current, negative DC current, and positive DC current, respectively.

[0037] Figure 6 This is a schematic diagram of the external air gap magnetic field when different DC currents are applied under no-load conditions. Figure 6 (a) in the figure shows a schematic diagram of the waveform of the external air gap magnetic field. Figure 6 (b) in the figure is a schematic diagram of the Fourier decomposition harmonics of the external air gap magnetic field; Figure 6 (c) in the figure shows the waveform of the internal air gap magnetic field. Figure 6 (d) in the figure represents the Fourier decomposition harmonics of the inner air gap magnetic field.

[0038] Figure 7 The figures show the torque waveforms of the outer stator armature winding when different DC currents are applied to it in the embodiments of the present invention.

[0039] Among them, 1-outer stator, 2-rotor, 3-inner stator, 4-outer stator yoke, 5-outer stator main teeth, 6-outer stator auxiliary teeth, 7-outer stator permanent magnet, 8-inner stator yoke, 9-inner stator main teeth, 10-inner stator auxiliary teeth, 11-inner stator permanent magnet, 12-outer stator armature winding, 13-inner stator armature winding, 14-rotor iron pole. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0041] Example 1

[0042] like Figure 1As shown in the figure, this embodiment 1 describes a DC biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor, which includes an outer stator 1, a rotor 2, and an inner stator 3, wherein the rotor 2 is located between the outer stator 1 and the inner stator 3.

[0043] The outer stator 1 includes the outer stator yoke 4, the outer stator main teeth 5, and the outer stator auxiliary teeth 6.

[0044] The outer stator yoke 4 is annular. There are multiple outer stator main teeth 5 and outer stator auxiliary teeth 6, and the outer stator main teeth 5 and outer stator auxiliary teeth 6 are arranged alternately along the inner circumference of the outer stator yoke 4.

[0045] The alternating arrangement here refers to the following arrangement along the inner circumference (clockwise or counterclockwise) of the outer stator yoke 4: first, an outer stator main tooth 5 is arranged, then an outer stator auxiliary tooth 6 is arranged, then another outer stator main tooth 5 is arranged...

[0046] Two external stator permanent magnets 7, separated by iron poles, are provided on each external stator main tooth 5.

[0047] Specifically, the outer end of the outer stator main tooth 5 is connected to the inner side of the outer stator yoke 4, and the inner end of the outer stator main tooth 5 extends to the outer side of the rotor 2; two outer stator permanent magnets 7 are disposed at the inner end of the outer stator main tooth 5 and are separated by iron poles.

[0048] The two external stator permanent magnets 7 on the same external stator main tooth 5 are arranged symmetrically about the center line of the external stator main tooth 5, such as... Figure 1 The position of the dotted line shown on the outer stator main tooth 5 is the position of the center line of the outer stator main tooth 5.

[0049] The outer ends of each outer stator auxiliary tooth 6 are respectively connected to the corresponding positions on the inner circumference of the outer stator yoke 4, and the outer stator main tooth 5 and the outer stator auxiliary tooth 6 are installed on the outer stator yoke 4 to form the above-mentioned alternating arrangement.

[0050] The auxiliary teeth 6 of the outer stator and the main teeth 5 of the outer stator with two outer stator permanent magnets 7 are arranged alternately to form an asymmetric alternating pole permanent magnet array of "Fe-NFe N-Fe", which can effectively reduce the leakage of permanent magnets.

[0051] In addition, the auxiliary tooth 6 of the outer stator can achieve phase isolation, which is beneficial to improve fault tolerance and reliability.

[0052] The rotor 2 is located between the outer stator 1 and the inner stator 3. The rotor 2 is composed of multiple spaced rotor poles 14, which are connected by epoxy resin or separated by air.

[0053] Air gaps are provided between the outer stator 1 and the rotor 2, and between the rotor 2 and the inner stator 3.

[0054] The inner stator 3 includes the inner stator yoke 8, the inner stator main teeth 9, and the inner stator auxiliary teeth 10.

[0055] The inner stator yoke 8 is circular. There are multiple inner stator main teeth 9 and inner stator auxiliary teeth 10, and the inner stator main teeth 9 and inner stator auxiliary teeth 10 are arranged alternately along the outer circumference of the inner stator yoke 8.

[0056] The alternating arrangement here refers to the following arrangement along the outer circumference (clockwise or counterclockwise) of the inner stator yoke 8: first, an inner stator yoke 8 is arranged, then an inner stator main tooth 9 is arranged, then another inner stator yoke 8 is arranged...

[0057] Two internal stator permanent magnets 11, separated by iron poles, are provided on each internal stator main tooth 9.

[0058] Specifically, the inner end of the inner stator main tooth 9 is connected to the outer side of the inner stator yoke 8, and the outer end of the inner stator main tooth 9 extends to the inner side of the rotor 2; two inner stator permanent magnets 11 separated by iron poles are provided at the inner end of the inner stator main tooth 9.

[0059] Two inner stator permanent magnets 11 on the same inner stator main tooth 9 are arranged symmetrically about the center line of the inner stator main tooth 9. For example... Figure 1 The position of the dotted line shown on the inner stator main tooth 9 is the position of the center line of the inner stator main tooth 9.

[0060] The inner ends of each inner stator auxiliary tooth 10 are respectively connected to the corresponding positions on the outer circumference of the inner stator yoke 8, and the inner stator main tooth 9 and the inner stator auxiliary tooth 10 are installed on the inner stator yoke 8 to form the above-mentioned alternating arrangement.

[0061] The inner stator auxiliary teeth 10 and the inner stator main teeth 9 with two inner stator permanent magnets 11 are arranged alternately to form an asymmetric alternating pole permanent magnet array of "Fe-NFe N-Fe", which can effectively reduce the leakage of permanent magnets.

[0062] In addition, the inner stator auxiliary teeth 10 can achieve phase isolation, which is beneficial to improve fault tolerance and reliability.

[0063] In this embodiment, no permanent magnets are provided on the rotor 2, but permanent magnets are provided only on the outer stator 1 and the inner stator 3 (i.e., the outer stator permanent magnet 7 on the outer stator 1 and the inner stator permanent magnet 11 on the inner stator 3), which helps the permanent magnets dissipate heat.

[0064] In this embodiment, the magnetic fields of the inner and outer stator permanent magnets are modulated by the magnetic field of the rotor iron poles to form a synergistically enhanced dual magnetic field modulation effect, which is conducive to exciting rich air gap magnetic field harmonic components, thereby significantly improving torque output capability.

[0065] Both the outer stator permanent magnet 7 and the inner stator permanent magnet 11 are magnetized radially outward.

[0066] The outer stator main tooth 5 is provided with an outer stator armature winding 12; the inner stator main tooth 9 is provided with an inner stator armature winding 13.

[0067] Both the outer stator armature winding 12 and the inner stator armature winding 13 adopt a concentrated winding. This concentrated winding can effectively shorten the winding end length, improve the slot fill factor and space utilization, and achieve a significant increase in torque density.

[0068] like Figure 1 As shown, the outer stator armature winding 12 includes the outer stator Ao phase winding and the outer stator B phase winding. O Phase windings and outer stator C O Phase winding. The inner stator armature winding 13 includes the inner stator A. i Phase winding, inner stator B i Phase windings and inner stator C i Phase winding.

[0069] The outer stator Ao phase winding is composed of A O + and A O - The phase winding formed by the two coils, outer stator B O The phase winding is composed of B O + and B O - The phase winding formed by the two coils, the outer stator winding C O It is by C O + and C O - A phase winding composed of two coils.

[0070] A DC biased AC current (containing both DC and AC components) is passed through the outer stator armature winding 12.

[0071] The DC component in the DC bias AC current is used to achieve magnetic adjustment. This DC component, together with the "Fe-NFeN-Fe" asymmetric alternating pole permanent magnet array proposed in this invention, can effectively achieve magnetic adjustment.

[0072] The formula for the current flowing through the outer stator armature winding 12 is:

[0073]

[0074] in, These represent coil A respectively. O +、A O -、B O +、B O -、C O +、C O - The current flowing through it, I ac To pass an alternating current, I dcLet f be the direct current flowing through the circuit, α be the current angle, and f be the current angle. e For frequency.

[0075] When alternating current is applied to the inner stator armature winding 13, the corresponding current formula is:

[0076]

[0077] Among them, i Ai It is the inner stator A i The current i flowing through the phase winding Bi It is the inner stator B i The current i flowing through the phase winding Ci It is the inner stator C i The current flowing through the phase winding.

[0078] Working principle section:

[0079] First, let me explain the advantages of the invented motor in reducing magnetic leakage by using an asymmetric alternating pole permanent magnet arrangement of "Fe-NFeN-Fe". Figure 2 (a) shows the main flux and leakage flux paths of a motor with a conventional “NS-NS” permanent magnet arrangement. Figure 2 (b) shows the main magnetic flux and leakage flux paths of the motor using the "Fe-NFeN-Fe" asymmetric alternating pole permanent magnet arrangement employed in the present invention. Figure 2 As shown in (a), in a motor with a traditional "NS-NS" permanent magnet array, half of the permanent magnets cannot contribute effective magnetic flux during energy conversion, resulting in pole magnetic leakage. Figure 2 In (b) of this invention, the motor employs an asymmetric alternating pole permanent magnet arrangement of "Fe-NFeN-Fe". Both permanent magnets on the stator main teeth can contribute to the main magnetic flux, thus significantly reducing leakage flux. Simultaneously, the "Fe-NFeN-Fe" asymmetric alternating pole permanent magnet arrangement design used in this invention reduces the amount of permanent magnets used, which helps to lower costs and improve the utilization rate of permanent magnets.

[0080] Secondly, the principle of magnetic flux regulation of the motor proposed in this invention is explained from the perspective of magnetic flux change:

[0081] Figure 3 The distribution of no-load magnetic flux lines is described as the rotor electrical position varies with θ at four typical positions. Figure 4 The following are given for A under no-load conditions: O + and A O - Two coils and the outer stator A formed by the two coils O Phase flux linkage waveform of phase winding, Figure 4 a, b, c, and d in the text correspond to respectively Figure 3The four different positions corresponding to (a), (b), (c), and (d) in the diagram. When the rotor position reaches... Figure 3 As shown in (a), the centerline of rotor pole 14 coincides with the centerline of the outer stator main tooth 5 where the outer stator Ao phase winding is located. O + and A O - The flux linkages of the two coils are zero and at their negative maximum values, respectively, causing the combined flux linkage of the outer stator Ao phase winding to reach its negative maximum value. This is achieved by rotating the rotor position 90° counterclockwise from the initial electrical angle. Figure 3 Position (b) is shown in the diagram. At this time, A... O + and A O - The two coils generate magnetic flux linkages of equal magnitude but opposite direction, resulting in zero magnetic flux linkage in the combined outer stator Ao phase winding. Further rotating counterclockwise by 90°, when the rotor position reaches... Figure 3 Position (c) is shown in the diagram. Here, the centerline of the rotor pole 14 is aligned with the centerline of the outer stator main tooth 5 of the outer stator Ao phase winding. O + and A O The flux linkages of the two coils are at their maximum positive value and zero, respectively, causing the flux linkage of the outer stator Ao phase winding to reach its maximum positive value. Finally, when the rotor position rotates further counterclockwise... Figure 3 At position (d) shown in the diagram, the flux linkage of the outer stator Ao phase winding returns to zero, meaning that the outer stator Ao phase winding exhibits a bipolar distribution within one electrical cycle.

[0082] In particular, the asymmetric alternating pole permanent magnet array structure of "Fe-NFeN-Fe" employed in this invention can cleverly achieve coil flux polarity transformation by applying direct current of different polarities. (External stator A) O Taking phase winding as an example, Figure 5 The following conditions are given for A: no DC current is applied, positive DC current is applied, and negative DC current is applied. O + and A O - The magnetic flux linkage waveforms of the coil are as follows: Figure 5 As shown in (a), (b), and (c) in the figure. Figure 5 As shown in (a) in the figure, A O + and A O - The magnetic flux linkage of the coil exhibits approximately unipolarity. Figure 5 As shown in (b), when a negative DC current is applied, the outer stator A rotates as the rotor rotates. O The flux linkage within the phase winding decreases, and A O + and A O - The magnetic flux linkage of the coil exhibits complete unipolarity, A O + and A O - The superposition of coil flux weakens the amplitude of the combined flux linkage, and the outer stator A OThe back electromotive force and torque output generated by the phase winding also decrease accordingly, which is the weak magnetic state. Figure 5 As shown in (c), when a positive DC current is applied, the outer stator A... O The flux linkage within the phase winding increases, and A O + and A O - The magnetic flux linkage of the coil exhibits bipolarity. A O + and A O - The superposition of coil flux linkages can increase the amplitude of the combined flux linkage, outer stator A O The back electromotive force and torque output generated by the phase winding increase accordingly, and this is the magnetization state.

[0083] As can be seen, the asymmetric alternating pole permanent magnet array structure of "Fe-NFeN-Fe" adopted in this invention, combined with the application of DC currents of different polarities, can cleverly realize the polarity transformation of the coil flux linkage, thereby achieving the magnetization function. It should be noted that, due to the magnetic saturation effect of the inner and outer stator main teeth, stator auxiliary teeth, and rotor iron poles 14, especially the stator auxiliary teeth which are prone to saturation during magnetization, the magnetization capability of the motor involved in this invention is weaker than its field weakening capability. Therefore, the motor involved in this invention is more practically valuable in applications requiring wide speed regulation, including electric vehicles and high-speed trains.

[0084] From the perspective of magnetic field modulation, without considering the rotor poles 14, the harmonic components in the air gap magnetic flux density of the motor only include the initial harmonics contributed by the magnetomotive force of the inner and outer stator permanent magnets, including the 6th, 12th, and 18th harmonics. However, since the permanent magnets are stationary, these stationary harmonics cannot participate in the generation of back electromotive force as working harmonics. In order for the motor to work normally, the rotor 2 of this invention is composed of multiple spaced rotor poles 14 (adjacent rotor poles 14 are connected, for example, with epoxy resin). By utilizing the modulation effect of the rotor poles 14 on the magnetic field of the inner and outer stator permanent magnets, such as... Figure 6 As shown in (a), (b), (c), and (d), abundant rotating modulation harmonics are generated in the air gap magnetic flux density, including the 5th, 7th, and 17th harmonics. These harmonics can all directly participate in the generation of the motor's back electromotive force as working harmonics. To fully utilize the magnetic field modulation effect, the number of winding pole pairs can be set according to the low-order pole pair number, thereby obtaining a higher pole ratio and generating a larger back electromotive force and torque. In addition, due to the low number of winding pole pairs, the overall size of the motor will be significantly reduced, thereby increasing the motor's torque density. When a DC current is applied to the outer stator armature winding, a DC excitation magnetomotive force with the same number of pole pairs as the permanent magnet excitation magnetomotive force is generated. Under the modulation effect of the rotor iron pole 14, corresponding air gap magnetic field harmonics such as the 5th, 7th, and 17th harmonics will be generated, thereby adjusting the amplitude of the working harmonics generated by the permanent magnet excitation, and thus realizing torque regulation, such as... Figure 7 As shown.

[0085] Of course, the above description is only a preferred embodiment of the present invention. The present invention is not limited to the above-described embodiments. It should be noted that any equivalent substitutions or obvious modifications made by those skilled in the art under the guidance of this specification fall within the scope of this specification and should be protected by the present invention.

Claims

1. A DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor, characterized in that, Includes the outer stator, rotor, and inner stator; The outer stator includes the outer stator yoke, the outer stator main teeth, and the outer stator auxiliary teeth; The outer stator yoke is circular; there are multiple outer stator main teeth and outer stator auxiliary teeth, and the outer stator main teeth and outer stator auxiliary teeth are arranged alternately along the inner circumferential direction of the outer stator yoke; Two permanent magnets, separated by iron poles, are installed on each external stator main tooth; The rotor is located between the outer stator and the inner stator; The inner stator includes the inner stator yoke, the inner stator main teeth, and the inner stator auxiliary teeth; The inner stator yoke is circular, and there are multiple inner stator main teeth and inner stator auxiliary teeth. The inner stator main teeth and inner stator auxiliary teeth are arranged alternately along the outer circumferential direction of the inner stator yoke. Two internal stator permanent magnets, separated by iron poles, are set on each internal stator main tooth; Both the outer and inner stators are equipped with an asymmetric alternating pole permanent magnet array of "Fe-NFeN-Fe"; The outer stator main teeth are provided with an outer stator armature winding; the inner stator main teeth are provided with an inner stator armature winding; a DC bias AC current is passed through the outer stator armature winding, wherein the DC component contained in the DC bias AC current is used to achieve magnetization; By passing DC currents of different polarities into the outer stator armature winding, the magnetic flux polarity of the coil is changed, thereby achieving magnetic adjustment; wherein, the DC currents of different polarities include positive DC current and negative DC current; When a negative DC current is applied, as the rotor rotates, the magnetic flux change in the outer stator armature winding decreases, and the magnetic flux of the two coils that make up the outer stator armature winding becomes completely unipolar. The superposition of the magnetic flux of the two coils weakens the amplitude of the combined magnetic flux, and the back electromotive force and torque output generated by the outer stator armature winding also decrease accordingly. This is the weak magnetic state. Conversely, when a positive DC current is applied, the magnetic flux in the outer stator armature winding increases as the rotor rotates, and the magnetic flux of the two coils that make up the outer stator armature winding exhibits bipolarity. The superposition of the magnetic flux of the two coils increases the amplitude of the combined magnetic flux, and the back electromotive force and torque output generated by the outer stator armature winding increase accordingly. This is the magnetization state.

2. The DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor according to claim 1, characterized in that, Air gaps are provided between the outer stator and the rotor, and between the rotor and the inner stator.

3. The DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor according to claim 1, characterized in that, The rotor consists of multiple spaced rotor poles; no permanent magnets are installed on the rotor.

4. The DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor according to claim 1, characterized in that, Both the outer stator permanent magnet and the inner stator permanent magnet are magnetized radially outward.

5. The DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor according to claim 1, characterized in that, Alternating current is supplied to the inner stator armature winding.

6. The DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor according to claim 1, characterized in that, Both the outer stator armature winding and the inner stator armature winding adopt a concentrated winding type.

7. The DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor according to claim 1, characterized in that, The outer end of the outer stator main tooth is connected to the inner side of the outer stator yoke, and the inner end of the outer stator main tooth extends to the outer side of the rotor; two outer stator permanent magnets separated by iron poles are provided at the inner end of the outer stator main tooth. The two external stator permanent magnets on the same external stator main tooth are arranged symmetrically about the center line of the external stator main tooth.

8. The DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor according to claim 1, characterized in that, The inner end of the inner stator main tooth is connected to the outer side of the inner stator yoke, and the outer end of the inner stator main tooth extends to the inner side of the rotor; two inner stator permanent magnets separated by iron poles are provided at the inner end of the inner stator main tooth. The two inner stator permanent magnets on the same inner stator main tooth are arranged symmetrically about the center line of the inner stator main tooth.

9. The DC-biased wide-range speed-regulating dual-stator variable flux magnetic field modulation motor according to claim 1, characterized in that, The outer ends of each of the external stator auxiliary teeth are respectively connected to the corresponding positions on the inner circumference of the external stator yoke; The inner ends of each of the inner stator auxiliary teeth are respectively connected to the corresponding positions on the outer circumference of the inner stator yoke.

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