Harmonic-wave high-utilization-rate high-power-density double-modulation non-contact integrated double-electromechanical-port motor

Abstract

The invention provides a harmonic high-utilization-rate high-power-density dual-modulation non-contact integrated double-electromechanical-port motor. The motor comprises a stator, an excitation rotor and a modulation rotor which are coaxially and sequentially nested from outside to inside, the stator is of a split tooth type structure, stator auxiliary teeth are split from stator main teeth, and the stator auxiliary teeth are evenly distributed in the circumferential direction and are of an open slot structure. Two sets of armature windings with different numbers of pole pairs are placed in the stator, one set is a higher harmonic modulation winding wound on a stator main tooth, the other set is a base harmonic modulation winding wound on a stator auxiliary tooth, and the higher harmonic modulation winding and the base harmonic modulation winding serve as two electric ports of the motor. The stator, the base harmonic modulation winding and the excitation rotor form a vernier motor, and the stator, the higher harmonic modulation winding, the excitation rotor and the modulation rotor form a higher harmonic magnetic flux modulation reluctance motor. The problems of low harmonic utilization rate, poor modulation effect and low torque density / power density in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet motors, and in particular to a harmonic high-utilization high-power-density double-modulation non-contact integrated dual-electromechanical port motor. Background Art

[0002] In the industrial field, it is usually necessary to change the speed and torque of the rotating mechanism. At present, the traditional "motor + mechanical transmission component" structure is still used, which has problems such as large size and weight, low reliability, complex mechanical transmission components, large energy loss, high maintenance cost, etc., resulting in low torque / power density. For example, the existing wind power generation system, represented by the coaxial counter-rotating wind power generation system, mostly uses planetary gears to complete the speed decoupling between the wind wheel and the motor. However, the transmission mechanism has a complex structure, friction loss, vibration and noise, and no overload protection function, which will greatly reduce the wind power conversion efficiency and torque / power density.

[0003] In order to make up for these defects, relevant researchers have proposed a brushless dual-mechanical port permanent magnet motor, such as the Chinese invention patent with publication number CN106374704A, which discloses a brushless dual-mechanical port permanent magnet motor, which embeds a magnetic field modulation motor and a traditional permanent magnet motor in the same motor. This structure controls the speed of the two mechanical rotors through the current frequency in the modulated winding on the stator and the permanent magnet winding, and applies additional current through the permanent magnet winding to make the permanent magnet rotor generate additional torque, thereby achieving torque decoupling of the two mechanical rotors, that is, achieving dual decoupling of speed and torque.

[0004] However, the topology of this brushless dual mechanical port permanent magnet motor adopts single flux fundamental harmonic magnetic field modulation. The fundamental harmonic modulation fails to fully utilize the magnetic field harmonics, and the harmonic utilization rate is low, resulting in low magnetic field modulation capability and weakening the torque / power density of the motor. Summary of the invention

[0005] In view of the above situation, the present invention provides a high harmonic utilization, high power density, dual modulation, non-contact integrated dual electromechanical port motor, aiming to solve the problems of low harmonic utilization, poor modulation effect, and low torque density / power density in the prior art.

[0006] A harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor, comprising a stator, an excitation rotor, and a modulation rotor coaxially nested in sequence from outside to inside;

[0007] The stator is a split-tooth structure, wherein the stator main teeth of the stator are split into stator auxiliary teeth, the stator auxiliary teeth are evenly distributed along the circumferential direction, and adopt an open slot structure; two sets of armature windings with different pole pairs are placed in the stator, one set is a high-order harmonic modulation winding, which is wound on the stator main teeth, and the other set is a fundamental harmonic modulation winding, which is wound on the stator auxiliary teeth. The high-order harmonic modulation winding and the fundamental harmonic modulation winding serve as two electrical ports of the motor, the stator, the fundamental harmonic modulation winding and the excitation rotor constitute a vernier motor, and the stator, the high-order harmonic modulation winding, the excitation rotor and the modulation rotor constitute a high-order harmonic flux modulation reluctance motor.

[0008] The above-mentioned harmonic high utilization rate high power density double modulation non-contact integrated dual electromechanical port motor, wherein the motor satisfies the following conditional formula:

[0009] p wm1 =|kp or ±p ir |

[0010] p wm2 =|N t ±p or |

[0011] Among them, p wm1 Indicates the number of pole pairs of high-order harmonic modulation windings, p or Indicates the number of excitation rotor pole pairs, p ir represents the number of modulating rotor teeth, k is a positive integer greater than 1, p wm2 Indicates the number of pole pairs of the fundamental harmonic modulation winding, N t Indicates the number of stator auxiliary teeth.

[0012] The above-mentioned harmonic high utilization rate high power density double modulation non-contact integrated dual electromechanical port motor, wherein the high-order harmonic modulation winding generates a pole pair number of p wm1 The armature magnetic field acts on the excitation rotor and the modulation rotor, and the motor satisfies the following conditional formula:

[0013]

[0014] Among them, f wm1 Indicates the current frequency of the high-order harmonic modulation winding, n or Indicates the excitation rotor speed, n ir Indicates the modulated rotor speed;

[0015] The fundamental harmonic modulation winding generates a pole pair number of p wm2 The armature magnetic field acts on the stator auxiliary teeth and the excitation rotor, and the motor satisfies the following conditional formula:

[0016]

[0017] Among them, f wm2 Indicates the frequency of the current in the fundamental harmonic modulated winding.

[0018] The above-mentioned harmonic high utilization rate, high power density, double modulation, non-contact integrated dual electromechanical port motor, wherein the excitation rotor includes a magnetic conductive block, a tangential excitation permanent magnet and a radial excitation permanent magnet, the magnetic conductive block is placed between adjacent tangential excitation permanent magnets, and the radial excitation permanent magnet is placed in the groove of the magnetic conductive block along the inner layer of the excitation rotor.

[0019] In the above-mentioned harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor, the polarities of two adjacent tangential excitation permanent magnets are opposite, and the polarities of two adjacent radial excitation permanent magnets are opposite.

[0020] The above-mentioned harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor, wherein the modulation rotor is a reluctance rotor, which is formed by stacking silicon steel sheets.

[0021] The above-mentioned harmonic high utilization and high power density double modulation non-contact integrated dual electromechanical port motor, wherein the high-order harmonic modulation winding and the fundamental harmonic modulation winding are m-phase windings, wherein m≥3.

[0022] The above-mentioned harmonic high utilization rate and high power density dual modulation non-contact integrated dual electromechanical port motor realizes dual flux modulation by modulating the excitation magnetic field generated by the excitation rotor through the stator auxiliary teeth and the modulation rotor, and the dual flux modulation respectively modulates the excitation magnetic field generated by the excitation rotor, reuses the excitation magnetic field, reduces one modulation rotor, and integrates the dual flux modulation with the dual electromechanical ports to realize non-contact high integration.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The stator, fundamental harmonic modulation winding and excitation rotor constitute a vernier motor, and the stator, high-order harmonic modulation winding, excitation rotor and modulation rotor constitute a high-order harmonic flux modulation reluctance motor. The high-order harmonic flux modulation reluctance motor breaks the traditional fundamental harmonic modulation mechanism and can effectively utilize high-order harmonics, thereby improving the utilization rate of working harmonics, enhancing the modulation effect, and increasing the air gap flux density of the motor, thereby enhancing the torque density of the motor.

[0025] (2) The present invention integrates a vernier motor with high torque density with a high-order harmonic flux modulated reluctance motor, further enhancing the torque density and power density of the motor system. Through the modulation effect of the stator auxiliary teeth and the modulation rotor, the two sets of armature windings with different pole pairs in the stator are matched with the magnetic fields of the two pole pairs, realizing electromechanical energy conversion and non-contact high integration.

[0026] (3) The present invention can be well applied to wind power generation systems, and can switch between different working conditions according to the power system's demand for electric energy or actual operating conditions. For example, when the power system's demand for electric energy is low or the wind energy is insufficient to drive the excitation rotor and the modulation rotor, the motor will adopt a single-rotor operation mode; when the power system's demand for electric energy is high and the wind speed is sufficient to drive the excitation rotor and the modulation rotor, the motor will adopt a dual-rotor operation mode. By replacing the generator, planetary gear and its transmission device in the traditional wind power generation system with one motor, the integration and efficiency of the wind power generation system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a harmonic high utilization, high power density, double modulation, non-contact integrated dual electromechanical port motor;

[0028] Figure 2 It is a structural schematic diagram of a high-order harmonic modulation winding connected in one phase and a fundamental harmonic modulation winding connected in one phase;

[0029] Figure 3 It is the schematic diagram of the excitation rotor structure;

[0030] Figure 4 Schematic diagram of the modulation rotor structure;

[0031] Figure 5 This is a schematic diagram of the motor port structure. DETAILED DESCRIPTION

[0032] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to various embodiments, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] See also Figures 1 to 5 An embodiment of the present invention provides a harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor, including a stator 1, an excitation rotor 2, and a modulation rotor 3 coaxially nested in sequence from outside to inside.

[0035] The stator 1 is a split-tooth structure, wherein the stator main teeth of the stator 1 are split 14 to form stator auxiliary teeth 15, and the stator auxiliary teeth 15 are evenly distributed along the circumferential direction and adopt an open slot structure.

[0036] Two sets of armature windings with different pole pairs are placed in the stator 1, one set is a high-order harmonic modulation winding 4, which is wound on the stator main teeth 14, and the other set is a fundamental harmonic modulation winding 5, which is wound on the stator auxiliary teeth 15. The high-order harmonic modulation winding 4 and the fundamental harmonic modulation winding 5 serve as two electrical ports of the motor.

[0037] In this embodiment, the number of pole pairs of the higher harmonic modulation winding 4 is 2, the number of pole pairs of the fundamental harmonic modulation winding 5 is 7, and there is no direct coupling between the two sets of windings.

[0038] The excitation rotor 2 includes a magnetic conductive block 6 , a tangential excitation permanent magnet 7 and a radial excitation permanent magnet 8 .

[0039] The magnetic conductive blocks 6 are placed between adjacent tangential excitation permanent magnets 7, and the radial excitation permanent magnets 8 are placed in the grooves of the magnetic conductive blocks 6 along the inner layer of the excitation rotor 2. In this embodiment, the number of pole pairs of the excitation rotor 2 is 11, the number of tangential excitation permanent magnets 7 is 22, the number of radial excitation permanent magnets 8 is 22, and the number of magnetic conductive blocks 6 is 22.

[0040] The polarities of two adjacent tangential excitation permanent magnets 7 are opposite, and the polarities of two adjacent radial excitation permanent magnets 8 are opposite.

[0041] The modulation rotor 3 is a reluctance rotor formed by stacking silicon steel sheets. In this embodiment, the number of teeth of the modulation rotor 3 is 31.

[0042] Specifically, the motor satisfies the condition: wm1 =|kp or ±p ir |, so that the stator 1, the high-order harmonic modulation winding 4 and the excitation rotor 2 and the modulation rotor 3 constitute a high-order harmonic flux modulation reluctance motor, wherein, p wm1 Indicates the number of pole pairs of high-order harmonic modulation windings, p or Indicates the number of excitation rotor pole pairs, p ir Represents the number of modulated rotor teeth, k is a positive integer greater than 1.

[0043] Specifically, the pole pair number p of the high-order harmonic modulation winding 4 is wm1 =3×11-31=2.

[0044] In addition, the motor satisfies the condition: wm2 =|N t ±p or |, so that the stator 1, the fundamental harmonic modulation winding 5 and the excitation rotor 2 constitute a vernier motor, where pwm2 Indicates the number of pole pairs of the fundamental harmonic modulation winding, N t Indicates the number of stator auxiliary teeth.

[0045] Specifically, the pole pair number p of the fundamental harmonic modulation winding 5 is wm2 =18-11=7.

[0046] In this embodiment, the higher harmonic modulation winding 4 and the fundamental harmonic modulation winding 5 are m-phase windings, where m≥3.

[0047] Specifically, the high-order harmonic modulation winding 4 generates a pole pair number p wm1 The armature magnetic field acts on the excitation rotor 2 and the modulation rotor 3 to generate a stable electromagnetic torque and improve the power density, and the motor satisfies the following conditional formula:

[0048]

[0049] Among them, f wm1 Indicates the current frequency of the high-order harmonic modulation winding, n or Indicates the excitation rotor speed, n ir Indicates the modulated rotor speed.

[0050] The fundamental harmonic modulation winding 5 generates a pole pair number p wm2 The armature magnetic field acts on the stator auxiliary teeth 15 and the excitation rotor 2 to generate a stable electromagnetic torque and improve the power density, and the motor satisfies the following conditional formula:

[0051]

[0052] Among them, f wm2 Indicates the frequency of the current in the fundamental harmonic modulated winding.

[0053] like Figure 5 As shown, the excitation rotor 2 and the modulation rotor 3 are two mechanical ports of the motor, and the mechanical power P is input through the excitation rotor shaft 9 and the modulation rotor shaft 10. m , output mechanical power P PM The high-order harmonic modulation winding 4 and the fundamental harmonic modulation winding 5 are two electrical ports of the motor. After being adjusted by the high-order harmonic modulation winding controller 11 and the fundamental harmonic modulation winding controller 12, the input electric power P e,m , output power P e,PM When electric power is input, the storage battery 13 is in a discharge state and is used as a motor; when electric power is output, the storage battery 13 is in a charge state and is used as a generator.

[0054] The tangential excitation permanent magnets 7 and radial excitation permanent magnets 8 of the excitation rotor 2 generate an 11-pole-pair magnetic field, which is modulated by the modulation rotor 3 to generate a 2-pole-pair main magnetic field, and the electromechanical energy conversion is realized by the high-order harmonic modulation winding 4.

[0055] The tangential excitation permanent magnets 7 and radial excitation permanent magnets 8 of the excitation rotor 2 generate an 11-pole-pair magnetic field, which is modulated by the stator auxiliary teeth 15 to generate a 7-pole-pair main magnetic field, and acts with the fundamental harmonic modulation winding 5 to achieve electromechanical energy conversion.

[0056] In addition, by changing the current frequency in the high-order harmonic modulation winding 4, the modulation rotor speed can be changed, and by changing the current amplitude, the modulation rotor output torque can be changed; by changing the current frequency in the fundamental harmonic modulation winding 5, the excitation rotor speed can be changed, and by changing the current amplitude, the excitation rotor output torque can be changed.

[0057] In addition, in the present embodiment, dual flux modulation is realized by modulating the excitation magnetic field generated by the excitation rotor 2 through the stator auxiliary teeth 15 and the modulation rotor 3, and the dual flux modulation respectively modulates the excitation magnetic field generated by the excitation rotor 2, reuses the excitation magnetic field, reduces one modulation rotor, and integrates the dual flux modulation with the dual electromechanical ports to realize non-contact high integration.

[0058] In summary, the harmonic high utilization rate and high power density dual modulation non-contact integrated dual electromechanical port motor provided in this embodiment has the following beneficial effects:

[0059] (1) The stator, fundamental harmonic modulation winding and excitation rotor constitute a vernier motor, and the stator, high-order harmonic modulation winding, excitation rotor and modulation rotor constitute a high-order harmonic flux modulation reluctance motor. The high-order harmonic flux modulation reluctance motor breaks the traditional fundamental harmonic modulation mechanism and can effectively utilize high-order harmonics, thereby improving the utilization rate of working harmonics, enhancing the modulation effect, and increasing the air gap flux density of the motor, thereby enhancing the torque density of the motor.

[0060] (2) The present invention integrates a vernier motor with high torque density with a high-order harmonic flux modulated reluctance motor, further enhancing the torque density and power density of the motor system. Through the modulation effect of the stator auxiliary teeth and the modulation rotor, the two sets of armature windings with different pole pairs in the stator are matched with the magnetic fields of the two pole pairs, realizing electromechanical energy conversion and non-contact high integration.

[0061] (3) The present invention can be well applied to wind power generation systems, and can switch between different working conditions according to the power system's demand for electric energy or actual operating conditions. For example, when the power system's demand for electric energy is low or the wind energy is insufficient to drive the excitation rotor and the modulation rotor, the motor will adopt a single-rotor operation mode; when the power system's demand for electric energy is high and the wind speed is sufficient to drive the excitation rotor and the modulation rotor, the motor will adopt a dual-rotor operation mode. By replacing the generator, planetary gear and its transmission device in the traditional wind power generation system with one motor, the integration and efficiency of the wind power generation system can be improved.

[0062] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A harmonic high utilization rate high power density double modulation non-contact integrated dual electromechanical port motor, characterized in that: It includes a stator, an excitation rotor and a modulation rotor which are coaxially nested in sequence from outside to inside; The stator is a split-tooth structure, wherein the stator main teeth of the stator are split into stator auxiliary teeth, the stator auxiliary teeth are evenly distributed along the circumferential direction, and adopt an open slot structure; two sets of armature windings with different pole pairs are placed in the stator, one set is a high-order harmonic modulation winding, which is wound on the stator main teeth, and the other set is a fundamental harmonic modulation winding, which is wound on the stator auxiliary teeth. The high-order harmonic modulation winding and the fundamental harmonic modulation winding serve as two electrical ports of the motor, the stator, the fundamental harmonic modulation winding and the excitation rotor constitute a vernier motor, and the stator, the high-order harmonic modulation winding, the excitation rotor and the modulation rotor constitute a high-order harmonic flux modulation reluctance motor.

2. The harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor according to claim 1 is characterized in that: The motor satisfies the following condition: p wml =|kp or ±p ir | p wm2 =|N t ±p or | Among them, p wm1 Indicates the number of pole pairs of high-order harmonic modulation windings, p or represents the number of excitation rotor pole pairs, p ir represents the number of modulating rotor teeth, k is a positive integer greater than 1, p wm2 Indicates the number of pole pairs of the fundamental harmonic modulation winding, N t Indicates the number of stator auxiliary teeth.

3. The harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor according to claim 1 is characterized in that: The high-order harmonic modulation winding generates a pole pair number of p wm1 The armature magnetic field acts on the excitation rotor and the modulation rotor, and the motor satisfies the following conditional formula: Among them, f wm1 Indicates the current frequency of the high-order harmonic modulation winding, n or Indicates the excitation rotor speed, n ir Indicates the modulated rotor speed; The fundamental harmonic modulation winding generates a pole pair number of p wm2 The armature magnetic field acts on the stator auxiliary teeth and the excitation rotor, and the motor satisfies the following conditional formula: Among them, f wm2 Indicates the frequency of the current in the fundamental harmonic modulated winding.

4. The harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor according to claim 1 is characterized in that: The excitation rotor comprises a magnetic conductive block, a tangential excitation permanent magnet and a radial excitation permanent magnet. The magnetic conductive block is placed between adjacent tangential excitation permanent magnets, and the radial excitation permanent magnet is placed in the groove of the magnetic conductive block along the inner layer of the excitation rotor.

5. The harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor according to claim 4 is characterized in that: The polarities of two adjacent tangential excitation permanent magnets are opposite, and the polarities of two adjacent radial excitation permanent magnets are opposite.

6. The harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor according to claim 1 is characterized in that: The modulation rotor is a reluctance rotor formed by stacking silicon steel sheets.

7. The harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor according to claim 1 is characterized in that: The high-order harmonic modulation winding and the fundamental harmonic modulation winding are m-phase windings, wherein m≥3.

8. The harmonic high utilization rate and high power density double modulation non-contact integrated dual electromechanical port motor according to claim 1 is characterized in that: By modulating the excitation magnetic field generated by the excitation rotor through the stator auxiliary teeth and the modulation rotor, dual flux modulation is realized, and the dual flux modulation respectively modulates the excitation magnetic field generated by the excitation rotor, thereby reusing the excitation magnetic field.

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