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

Abstract

The utility model provides a double-modulation non-contact integrated double-electromechanical-port motor with high harmonic utilization rate and high power density. The double-modulation non-contact integrated double-electromechanical-port 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. According to the utility model, 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 utility model relates to permanent magnet motor technical field especially is related to a kind of harmonic high utilization rate high power density double-modulation non-contact integrated double machine and electric port motor. BACKGROUND

[0002] In the industrial field, it is often 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 the problems of 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, usually uses planetary gears to complete the speed decoupling between the wind wheel and the motor. However, the transmission mechanism structure is complex, with friction loss, vibration and noise, and no overload protection function, which greatly reduces the wind power conversion efficiency and torque / power density.

[0003] In order to make up for these defects, relevant researchers have proposed a brushless double mechanical port permanent magnet motor, such as the Chinese utility model patent with publication number CN106374704A, which discloses a brushless double mechanical port permanent magnet motor, which embeds a magnetic field modulation motor and a traditional permanent magnet motor in the same motor. The structure controls the speed of the two mechanical rotors by the current frequency of the modulation winding and the permanent magnet winding on the stator, and generates additional torque on the permanent magnet rotor by applying additional current to the permanent magnet winding, so that the two mechanical rotors are decoupled in torque, i.e. speed and torque are doubly decoupled.

[0004] However, the topology of this brushless double mechanical port permanent magnet motor uses single-flux fundamental harmonic magnetic field modulation, which uses fundamental harmonic modulation and does not fully utilize the magnetic field harmonics, resulting in low harmonic utilization rate, low magnetic field modulation capacity and low torque / power density of the motor. UTILITY MODEL CONTENTS

[0005] In view of the above situation, the utility model provides a kind of harmonic high utilization rate high power density double-modulation non-contact integrated double machine and electric port motor, to solve the problems of low harmonic utilization rate, poor modulation effect, low torque density / power density of prior art.

[0006] A kind of harmonic high utilization rate high power density double-modulation non-contact integrated double machine and electric port motor, including coaxial by outer to inner sequentially nested stator, excitation rotor, modulation rotor;

[0007] The stator is split tooth structure, the stator main tooth of the stator splits out stator auxiliary tooth, the stator auxiliary tooth is uniformly distributed along the circumferential direction, and adopts open slot structure; two sets of different pole pair number armature windings are placed in the stator, one set is high harmonic modulation winding, wound on the stator main tooth, the other set is base harmonic modulation winding, wound on the stator auxiliary tooth, the high harmonic modulation winding and the base harmonic modulation winding are used as two electrical ports of the motor, the stator, the base harmonic modulation winding and the excitation rotor constitute a vernier motor, and the stator, the high harmonic modulation winding, the excitation rotor and the modulation rotor constitute a high harmonic flux modulation reluctance motor.

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

[0009] p wm1 = |kp or ±p ir |

[0010] p wm2 = |N t ±p or |

[0011] Wherein, p wm1 represents the pole pair number of the high harmonic modulation winding, p or represents the pole pair number of the excitation rotor, p ir represents the tooth number of the modulation rotor, k is a positive integer greater than 1, p wm2 represents the pole pair number of the base harmonic modulation winding, N t represents the tooth number of the stator auxiliary tooth.

[0012] The above-mentioned harmonic high utilization rate high power density double modulation non-contact integrated double machine electrical port motor, wherein the high harmonic modulation winding generates an armature magnetic field with a pole pair number of p wm1 , and the motor satisfies the following conditional expression:

[0013]

[0014] Wherein, f wm1 represents the current frequency of the high harmonic modulation winding, n or represents the speed of the excitation rotor, n ir represents the speed of the modulation rotor.

[0015] The base harmonic modulation winding generates an armature magnetic field with a pole pair number of p wm2 , and the motor satisfies the following conditional expression:

[0016]

[0017] Wherein, f wm2 Indicates the current frequency of the fundamental harmonic modulation winding.

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

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

[0020] The above-mentioned high-harmonic high-power-density double-modulation non-contact integrated double electromechanical port motor, wherein the modulation rotor is a reluctance rotor and is made of silicon steel sheets.

[0021] The above-mentioned high-harmonic high-power-density double-modulation non-contact integrated double electromechanical port motor, wherein the high-order harmonic modulation winding and the fundamental harmonic modulation winding are m-phase windings, wherein m is greater than or equal to 3.

[0022] The above-mentioned high-harmonic high-power-density double-modulation non-contact integrated double electromechanical port motor, wherein the excitation magnetic field generated by the excitation rotor is modulated by the stator auxiliary teeth and the modulation rotor to realize double-flux modulation, the double-flux modulation respectively modulates the excitation magnetic field generated by the excitation rotor, multiplexes the excitation magnetic field, reduces one modulation rotor, integrates the double-flux modulation and the double electromechanical port, and realizes non-contact high integration.

[0023] Compared with the prior art, the utility model has following beneficial effects:

[0024] (1) the stator, the fundamental harmonic modulation winding and the excitation rotor constitute a vernier motor, the stator, the high-order harmonic modulation winding, the excitation rotor and the 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, can effectively utilize high-order harmonic, plays the role of improving working harmonic utilization rate, enhances modulation effect, improves motor air gap flux density and the like, and further enhances the torque density of the motor.

[0025] (2) the utility model integrates the vernier motor with high torque density and the high-order harmonic flux modulation reluctance motor, further enhances the torque density and power density of the motor system, and the modulation effect of the stator auxiliary teeth and the modulation rotor makes the two sets of armature windings with different pole pairs in the stator and the two kinds of magnetic fields with different pole pairs match each other, and realizes electromechanical energy conversion.

[0026] (3) This utility model can be well applied to wind power generation systems, and can switch between different operating conditions according to the power system's demand for electricity or actual operating conditions. For example, when the power system's demand for electricity is low or the wind energy is insufficient to drive the excitation rotor and modulation rotor, the motor will adopt a single rotor operation mode; when the power system's demand for electricity is high and the wind speed is sufficient to drive the excitation rotor and 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 a single motor, the integration and efficiency of the wind power generation system are improved. Attached Figure Description

[0027] Figure 1 A schematic diagram of a dual-electromechanical-port motor with high harmonic utilization, high power density, dual modulation, non-contact design.

[0028] Figure 2 A schematic diagram showing the structure of a one-phase connection of a higher harmonic modulation winding and a one-phase connection of a fundamental harmonic modulation winding;

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

[0030] Figure 4 This is a schematic diagram of the modulation rotor structure;

[0031] Figure 5 This is a schematic diagram of the motor's port structure. Detailed Implementation

[0032] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to various embodiments. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Please see Figures 1 to 5 The present invention proposes a high harmonic utilization and high power density dual-modulation non-contact integrated dual electromechanical port motor, which includes a stator 1, an excitation rotor 2, and a modulation rotor 3 nested coaxially from the outside to the inside.

[0035] The stator 1 has a split tooth structure, and the main stator teeth of the stator 1 split 14 to produce auxiliary stator teeth 15. The auxiliary stator 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 stator 1. One set is a high-order harmonic modulation winding 4, which is wound on the stator main tooth 14, and the other set is a fundamental harmonic modulation winding 5, which is wound on the stator auxiliary tooth 15. The high-order harmonic modulation winding 4 and the fundamental harmonic modulation winding 5 serve as the two electrical ports of the motor.

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

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

[0039] The magnetic guide block 6 is placed between adjacent tangential excitation permanent magnets 7, and the radial excitation permanent magnet 8 is placed in the slot of the magnetic guide block 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 guide blocks 6 is 22.

[0040] Among them, 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, which is made of stacked silicon steel sheets. In this embodiment, the modulation rotor 3 has 31 teeth.

[0042] Specifically, the motor satisfies the condition: p wm1 =|kp or ±p ir This allows the stator 1, the high-order harmonic modulation winding 4, the excitation rotor 2, and the modulation rotor 3 to form a high-order harmonic flux modulation reluctance motor, where p wm1 p represents the number of pole pairs in the higher harmonic modulation winding. or p represents the number of pole pairs of the excitation rotor. ir This represents the number of teeth on the modulation rotor, where k is a positive integer greater than 1.

[0043] Specifically, the number of pole pairs p of the higher harmonic modulation winding 4 wm1 =3×11-31=2.

[0044] Furthermore, the motor satisfies the condition: p wm2 =|N t ±p or This allows the stator 1, the fundamental harmonic modulation winding 5, and the excitation rotor 2 to form a vernier motor, where pwm2 N represents the number of pole pairs in the fundamental harmonic modulation winding. t This indicates the number of teeth in the stator auxiliary teeth.

[0045] Specifically, the number of pole pairs p of the fundamental harmonic modulation winding 5 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 higher harmonic modulation winding 4 generates a pole pair number of p. wm1 The armature magnetic field interacts with the excitation rotor 2 and the modulation rotor 3 to generate stable electromagnetic torque and increase power density, and the motor satisfies the following condition:

[0048]

[0049] Among them, f wm1 n represents the current frequency of the higher harmonic modulation winding. or Indicates the excitation rotor speed, n ir This indicates the speed of the modulated rotor.

[0050] The fundamental harmonic modulation winding 5 generates a pole pair number of p. wm2 The armature magnetic field interacts with the stator auxiliary teeth 15 and the excitation rotor 2 to generate stable electromagnetic torque and increase power density, and the motor satisfies the following condition:

[0051]

[0052] Among them, f wm2 This indicates the current frequency of the fundamental harmonic modulation winding.

[0053] like Figure 5 As shown, the excitation rotor 2 and the modulation rotor 3 serve as the two mechanical ports of the motor, through which mechanical power P is input via the excitation rotor shaft 9 and the modulation rotor shaft 10. m Output mechanical power P PM The higher harmonic modulation winding 4 and the fundamental harmonic modulation winding 5 serve as the two electrical ports of the motor. After adjustment by the higher harmonic modulation winding controller 11 and the fundamental harmonic modulation winding controller 12, the input electrical power P is obtained. e,m Output power P e,PM When power is input, battery 13 is in a discharging state and is used as a motor; when power is output, battery 13 is in a charging state and is used as a generator.

[0054] The tangential excitation permanent magnet 7 and the radial excitation permanent magnet 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, which interacts with the high-order harmonic modulation winding 4 to achieve electromechanical energy conversion.

[0055] The tangential excitation permanent magnet 7 and the radial excitation permanent magnet 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, which interacts with the fundamental harmonic modulation winding 5 to achieve electromechanical energy conversion.

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

[0057] Furthermore, in this embodiment, the excitation magnetic field generated by the excitation rotor 2 is modulated by the stator auxiliary tooth 15 and the modulation rotor 3, thereby realizing dual magnetic flux modulation. The dual magnetic flux modulation modulates the excitation magnetic field generated by the excitation rotor 2 respectively, reuses the excitation magnetic field, reduces one modulation rotor, and integrates dual magnetic flux modulation with dual electromechanical ports to achieve non-contact high integration.

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

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

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

[0061] (3) This utility model can be well applied to wind power generation systems, and can switch between different operating conditions according to the power system's demand for electricity or actual operating conditions. For example, when the power system's demand for electricity is low or the wind energy is insufficient to drive the excitation rotor and modulation rotor, the motor will adopt a single rotor operation mode; when the power system's demand for electricity is high and the wind speed is sufficient to drive the excitation rotor and 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 a single motor, the integration and efficiency of the wind power generation system are improved.

[0062] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A high power density dual-modulation contactless integrated dual electro-mechanical port electric machine with high harmonic utilization, characterized in that, The stator, the excitation rotor and the modulation rotor are coaxially nested from outside to inside. The stator is of split tooth structure, and the stator main teeth are split into stator auxiliary teeth which are uniformly distributed in 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 of which is a high harmonic modulation winding wound on the stator main teeth, and the other set is a fundamental harmonic modulation winding wound on the stator auxiliary teeth; the high 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 harmonic modulation winding, the excitation rotor and the modulation rotor constitute a high harmonic flux modulation reluctance motor.

2. The high power density dual modulation non-contact integrated dual electro-mechanical port electric machine with high utilization of harmonics of claim 1, wherein, The motor satisfies the following conditional expression: wherein p wm1 represents the number of poles of the high harmonic modulation winding, p or represents the number of poles of the excitation rotor, p ir represents the number of teeth of the modulation rotor, k is a positive integer greater than 1, p wm2 represents the number of poles of the base harmonic modulation winding, N t represents the number of teeth of the stator auxiliary.

3. The high power density dual mechanically commutated electric motor with high harmonic utilization and high efficiency of claim 2, wherein, The high harmonic modulation winding generates an armature magnetic field with a pole pair number p wm1 of 2pM, which interacts with the field rotor and the modulation rotor, and the electric machine satisfies the following condition equation: wherein, f wm1 denotes the frequency of the current of the high-harmonic modulation winding, n or denotes the speed of the excitation rotor, n ir denotes the speed of the modulation rotor; The fundamental harmonic modulation winding generates an armature magnetic field with a pole pair number p wm2 of the motor satisfies the following conditional expression: wherein f wm2 denotes the frequency of the current in the fundamental harmonic modulation winding.

4. The high power density dual mechanically commutated electric motor with high harmonic utilization of claim 1, wherein, The excitation rotor comprises magnetic conductive blocks, tangential excitation permanent magnets and radial excitation permanent magnets, the magnetic conductive blocks are placed between adjacent tangential excitation permanent magnets, and the radial excitation permanent magnets are placed in the slots of the magnetic conductive blocks along the inner layer of the excitation rotor.

5. The high power density dual mechanically commutated electric motor with high harmonic utilization and high power density dual modulation non-contact integrated dual electro-mechanical port electric motor of claim 4, wherein, The polarities of adjacent two tangential excitation permanent magnets are opposite, and the polarities of adjacent two radial excitation permanent magnets are opposite.

6. The high power density dual mechanically commutated electric motor with high harmonic utilization of claim 1, wherein, The modulation rotor is a reluctance rotor composed of silicon steel sheets.

7. The high power density dual mechanically commutated electric motor with high harmonic utilization and high efficiency of claim 1, wherein, The high harmonic modulation winding and the fundamental harmonic modulation winding are m Phase windings, wherein m ≥ 3.

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