Stator and rotor punching sheet structure of centralized winding

Abstract

The utility model relates to the technical field of motor parts, and particularly discloses a stator and rotor punching sheet structure of a centralized winding motor, which comprises a rotor punching sheet and a stator punching sheet, a plurality of eccentric arc sections are arranged on the periphery of the rotor punching sheet, mounting grooves are formed in the eccentric arc sections, permanent magnets are fixedly arranged in the mounting grooves, and the stator punching sheet and the rotor punching sheet are coaxially arranged. The inner wall of the stator punching sheet and the outer wall of the rotor punching sheet are oppositely arranged, an air gap is reserved between the stator punching sheet and the rotor punching sheet, and a plurality of stator teeth are annularly arranged on the inner circumference of the stator punching sheet. The motor provided by the utility model has the effect of improving the problems of relatively large cogging torque and noise vibration of the existing motor.

Description

Technical Field

[0001] This application relates to the technical field of motor components, and in particular to a stator and rotor lamination structure of a concentrated winding motor. Background Technology

[0002] Concentrated winding motors are small in size, low in cost, and have high power density. They are also easy to automate, leading to their widespread application in industries such as manufacturing, home appliances, and electric vehicles. Generally, concentrated winding motors employ surface-mounted or internal rotor structures. The internal rotor structure, in particular, effectively utilizes reluctance torque and enables high-speed field weakening, thus broadening the application range of concentrated winding motors.

[0003] However, the built-in rotor structure has large air gap magnetic field harmonics, resulting in greater cogging torque, noise, and vibration in the motor, which limits the further application of this type of motor structure. Utility Model Content

[0004] In order to improve the problems of excessive cogging torque and noise and vibration in existing motors, this application provides a stator and rotor lamination structure with concentrated windings.

[0005] The stator and rotor lamination structure with centralized winding provided in this application adopts the following technical solution:

[0006] A stator and rotor lamination structure with concentrated windings, comprising:

[0007] The rotor lamination has several eccentric arc segments on its outer periphery. The eccentric arc segments have mounting slots, and permanent magnets are fixedly installed in the mounting slots.

[0008] The stator lamination is coaxially arranged with the rotor lamination. The inner wall of the stator lamination is opposite to the outer wall of the rotor lamination. An air gap is left between the stator lamination and the rotor lamination. Several stator teeth are arranged in a ring around the inner circumference of the stator lamination.

[0009] By adopting the above technical solutions, the stator laminations and rotor laminations can reduce the harmonic content of the rotating magnetic field in the air gap, increase the fundamental wave content of the air gap magnetic flux density waveform, control the content of back electromotive force harmonics, and reduce cogging torque and torque pulsation, thereby improving the problem of large air gap harmonics in motors and improving the problems of large cogging torque, noise, and vibration in existing motors.

[0010] Preferably, the inner arc surface of the stator teeth is symmetrically provided with a tooth-cutting structure, and the starting angle θ1 of the tooth-cutting structure satisfies the following relationship: θ1=360°*f2 / (8p*a), where f2=0.30~0.42, p is the number of pole pairs of the motor, and a is the minimum air gap distance between the stator lamination and the rotor lamination.

[0011] By adopting the above technical solution, a tooth-cutting structure is symmetrically set on the inner arc surface of the stator teeth, and the starting angle θ1 of the tooth-cutting structure is calculated according to the above formula. This can further optimize the distribution of the air gap rotating magnetic field and reduce the content of magnetic field harmonics in the air gap. Optimizing the magnetic field distribution can effectively control the content of back electromotive force harmonics, thereby reducing the cogging torque and torque pulsation, thus improving the air gap harmonic problem of the motor, reducing the noise and vibration during motor operation, and improving the operating efficiency and stability of the motor.

[0012] Preferably, the slope θ2 of the toothed structure satisfies the following relationship: θ2=360°*f2*(e / R) / (2p), where f2=0.30~0.42, e is the distance between the center of the eccentric arc segment of the rotor lamination and the center of the standard circle, and R is the maximum outer radius of the rotor lamination.

[0013] By adopting the above technical solution, a tooth-cutting structure is symmetrically set on the inner arc surface of the stator teeth, and the slope θ2 of the tooth-cutting structure is calculated according to the above formula. This can further optimize the distribution of the air gap rotating magnetic field and reduce the content of magnetic field harmonics in the air gap. Optimizing the magnetic field distribution can effectively control the content of back electromotive force harmonics, thereby reducing the cogging torque and torque pulsation, thus improving the air gap harmonic problem of the motor, reducing the noise and vibration during motor operation, and improving the operating efficiency and stability of the motor.

[0014] Preferably, the ratio of the eccentricity e of the eccentric arc segment to the maximum outer radius R of the rotor lamination is defined as the eccentricity e / R, and the eccentricity e / R satisfies the following relationship: e / R=2L*f1*a / (p*T), where f1=0.4~0.6, T is the thickness of the permanent magnet, and L is the length of the permanent magnet.

[0015] By adopting the above technical solution and setting the eccentricity e / R, the distribution of the air gap rotating magnetic field can be further optimized, the content of magnetic field harmonics in the air gap can be reduced, and the optimized magnetic field distribution can effectively control the content of back electromotive force harmonics, thereby reducing cogging torque and torque pulsation, thus improving the air gap harmonic problem of the motor, reducing the noise and vibration during motor operation, and improving the operating efficiency and stability of the motor.

[0016] Preferably, there are several rotor laminations, which are stacked axially to form a cylindrical shape, and each rotor lamination is fixedly connected to the adjacent rotor lamination.

[0017] By adopting the above technical solution, the stacked structure of multiple rotor laminations can ensure the uniform distribution of permanent magnets on the rotor, further optimize the uniformity of the air gap magnetic field, help reduce the harmonic content of the magnetic field in the air gap, increase the fundamental wave content of the air gap magnetic flux density waveform, and thus improve the efficiency and performance of the motor.

[0018] Preferably, there are several stator laminations, which are stacked axially to form a cylindrical shape, and each stator lamination is fixedly connected to the adjacent stator lamination.

[0019] By adopting the above technical solutions, the uniform distribution of stator teeth and air gap can be ensured, the uniformity of air gap magnetic field can be further optimized, the harmonic content of magnetic field in air gap can be reduced, the fundamental content of air gap magnetic flux density waveform can be increased, thereby improving the efficiency and performance of motor, reducing motor cogging torque, and achieving optimization of motor output torque and performance improvement.

[0020] Preferably, the permanent magnet is plate-shaped, and there are several permanent magnets.

[0021] By adopting the above technical solution, the structure of the plate-shaped permanent magnet is relatively simple, which makes it easy to fix and install, and reduces the risk of loosening or falling off the permanent magnet during operation, thereby improving the reliability and service life of the motor.

[0022] Preferably, there are several mounting slots, and each mounting slot is matched with a corresponding permanent magnet.

[0023] By adopting the above technical solution, the matching of the mounting slot and the permanent magnet can ensure the precise installation of the permanent magnet on the rotor lamination, thereby avoiding displacement or loosening of the permanent magnet during operation, and thus improving the stability and reliability of the motor.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The stator and rotor laminations can reduce the harmonic content of the magnetic field in the air gap, increase the fundamental content of the air gap magnetic flux density waveform, control the content of back electromotive force harmonics, and reduce cogging torque and torque pulsation, thereby improving the problem of large air gap harmonics in existing motors and improving the motor end noise and vibration characteristics.

[0026] 2. By symmetrically setting the tooth-cutting structure on the inner arc surface of the stator teeth and calculating the starting angle θ1 of the tooth-cutting structure according to the above formula, the distribution of the air gap magnetic field can be further optimized, and the content of magnetic field harmonics in the air gap can be reduced. Optimizing the magnetic field distribution can effectively control the content of back electromotive force harmonics, thereby reducing the cogging torque and torque pulsation, thus improving the air gap harmonic problem of the motor, reducing the noise and vibration during motor operation, and improving the operating efficiency and stability of the motor.

[0027] 3. By symmetrically setting the tooth-cutting structure on the inner arc surface of the stator teeth and calculating the slope θ2 of the tooth-cutting structure according to the above formula, the distribution of the air gap magnetic field can be further optimized, and the content of magnetic field harmonics in the air gap can be reduced. Optimizing the magnetic field distribution can effectively control the content of back electromotive force harmonics, thereby reducing the cogging torque and torque pulsation, thus improving the air gap harmonic problem of the motor, reducing the noise and vibration during motor operation, and improving the operating efficiency and stability of the motor. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the stator and rotor lamination structure of the concentrated winding in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the rotor lamination structure in the embodiments of this application;

[0030] Figure 3 This is a partial schematic diagram of the eccentric arc structure of the rotor lamination in the embodiments of this application;

[0031] Figure 4 This is a schematic diagram of the permanent magnet arrangement in an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of the stator lamination structure in the embodiments of this application;

[0033] Figure 6 This is a partial structural schematic diagram of the tooth-cutting structure of the stator lamination in the embodiments of this application;

[0034] Figure 7 This is a schematic diagram of the back electromotive force according to an embodiment of this application;

[0035] Figure 8 This is a schematic diagram of the ratio of each order harmonic to the fundamental frequency in this application;

[0036] Figure 9 This is a schematic diagram of the cogging torque of this application;

[0037] Figure 10 This is a schematic diagram of the torsional force of this application.

[0038] Explanation of reference numerals in the attached drawings: 1. Stator lamination; 2. Rotor lamination; 3. Permanent magnet; 4. Stator teeth; 5. Tooth-cutting structure; 6. Eccentric arc segment; 7. Mounting slot. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0040] This application discloses a stator and rotor lamination structure with centralized windings. (Refer to...) Figure 1The stator and rotor lamination structure of the concentrated winding includes rotor lamination 2 and stator lamination 1. The arrangement of stator lamination 1 and rotor lamination 2 can reduce the harmonic content of the magnetic field in the air gap, increase the fundamental content of the air gap magnetic flux density waveform, control the content of back electromotive force harmonics, and reduce cogging torque and torque pulsation, thereby improving the problem of large air gap harmonics in existing motors, improving the motor end noise and vibration characteristics, and further improving the problems of large cogging torque, noise and vibration in existing motors.

[0041] like Figure 2 and Figure 3 As shown, the outer periphery of the rotor lamination 2 is provided with several eccentric arc segments 6, and the eccentric arc segments 6 are provided with mounting grooves 7. Permanent magnets 3 are fixedly installed in the mounting grooves 7. There are several rotor laminations 2, and the several rotor laminations 2 are stacked along the axial direction to form a cylindrical shape. Each rotor lamination 2 is fixedly connected to the adjacent rotor laminations 2. The stacking structure of multiple rotor laminations 2 can ensure the uniform distribution of permanent magnets 3 on the rotor, further optimize the uniformity of the air gap rotating magnetic field, help reduce the harmonic content of the magnetic field in the air gap, increase the fundamental wave content of the air gap magnetic flux density waveform, thereby improving the efficiency and performance of the motor.

[0042] For details, please refer to Figure 4 The rotor structure of this centralized winding motor is a V-shaped built-in structure, with two N-pole permanent magnets of the same polarity forming a V-shape, creating a pole arc. Correspondingly, S-pole permanent magnets are arranged within adjacent pole arcs. Following this pattern, permanent magnets of different polarities are arranged alternately in the circumferential direction, such as... Figure 4 As shown. Generally, the included angle θ of the V-shaped structure varies within the range of 90° to 180°. When it reaches 180°, it can be regarded as a straight structure, that is, the other embodiment provided earlier can be regarded as a modified V-shaped structure. The purpose of setting the V-shaped built-in rotor structure is mainly to improve the output capacity of the motor and widen the speed regulation range of the motor. Its included angle θ determines the arrangement position and size of the permanent magnet, and then determines the eccentric arc of the rotor according to the formula proposed in this application.

[0043] For example, in this embodiment of the application, the permanent magnet 3 is plate-shaped, and a plurality of permanent magnets 3 are provided, and a plurality of mounting slots 7 are provided, each mounting slot 7 being matched with a corresponding permanent magnet 3; the plate-shaped permanent magnet 3 has a relatively simple structure, which is convenient for fixing and installation, and reduces the risk of loosening or falling off the permanent magnet 3 during operation, thereby improving the reliability and service life of the motor. The matching of the mounting slot 7 with the permanent magnet 3 can ensure the precise installation of the permanent magnet 3 on the rotor lamination 2, thereby avoiding displacement or loosening of the permanent magnet 3 during operation, and thus improving the stability and reliability of the motor.

[0044] In this embodiment, the ratio of the eccentricity e of the eccentric arc segment 6 to the maximum outer radius R of the rotor lamination 2 is defined as the eccentricity e / R. The eccentricity e / R satisfies the following relationship: e / R=2L*f1*a / (p*T), where f1=0.4~0.6, T is the thickness of the permanent magnet 3, and L is the length of the permanent magnet 3. Setting the eccentricity e / R can further optimize the distribution of the air gap magnetic field, reduce the content of magnetic field harmonics in the air gap, and the optimized magnetic field distribution can effectively control the content of back electromotive force harmonics, thereby reducing cogging torque and torque pulsation, thus improving the air gap harmonic problem of the motor, reducing the noise and vibration during motor operation, and improving the operating efficiency and stability of the motor.

[0045] Specifically, because this type of centrally wound motor uses a V-shaped built-in rotor structure, while widening its speed range, it inevitably increases the magnetic flux density harmonics in the air gap, leading to a non-sinusoidal back EMF waveform and negatively impacting motor control and operation. By designing eccentric arc segments 6 on the outer contour of the rotor lamination 2, where the number of eccentric arcs is the same as the number of rotor poles, and the eccentricity is a function of the number of poles, the width of the permanent magnet 3, and the length of the permanent magnet 3, sinusoidal shaping of the magnetic flux density waveform in the air gap can be achieved. This reduces the content of harmonics of each order, increases the proportion of the fundamental frequency, thereby improving the motor's output capability and suppressing the pulsation problem of the motor's output torque.

[0046] like Figure 5 and Figure 6 As shown, stator lamination 1 and rotor lamination 2 are coaxially arranged, the inner wall of stator lamination 1 is opposite to the outer wall of rotor lamination 2, an air gap is left between stator lamination 1 and rotor lamination 2, and several stator teeth 4 are arranged in a ring around the inner circumference of stator lamination 1.

[0047] In this embodiment, the inner arc surface of the stator tooth 4 is symmetrically provided with a tooth-cutting structure 5. The starting angle θ1 of the tooth-cutting structure 5 satisfies the following relationship: θ1=360°*f2 / (8p*a), where f2=0.30~0.42, p is the number of pole pairs of the motor, and a is the minimum air gap distance between the stator lamination 1 and the rotor lamination 2. By symmetrically providing the tooth-cutting structure 5 on the inner arc surface of the stator tooth 4 and calculating the starting angle θ1 of the tooth-cutting structure 5 according to the above formula, the distribution of the air gap magnetic field can be further optimized, and the content of magnetic field harmonics in the air gap can be reduced. Optimizing the magnetic field distribution can effectively control the content of back electromotive force harmonics, thereby reducing the cogging torque and torque pulsation, thus improving the air gap harmonic problem of the motor, reducing the noise and vibration during motor operation, and improving the operating efficiency and stability of the motor.

[0048] It should be noted that the slope θ2 of the tooth-cutting structure 5 satisfies the following relationship: θ2=360°*f2*(e / R) / (2p), where f2=0.30~0.42, e is the distance between the center of the eccentric arc segment 6 of the rotor lamination 2 and the center of the standard circle, and R is the maximum outer radius of the rotor lamination 2. By symmetrically setting the tooth-cutting structure 5 on the inner arc surface of the stator tooth 4 and calculating the slope θ2 of the tooth-cutting structure 5 according to the above formula, the distribution of the air gap magnetic field can be further optimized, and the content of magnetic field harmonics in the air gap can be reduced. Optimizing the magnetic field distribution can effectively control the content of back electromotive force harmonics, thereby reducing the cogging torque and torque pulsation, thus improving the air gap harmonic problem of the motor, reducing the noise and vibration during motor operation, and improving the operating efficiency and stability of the motor.

[0049] Specifically, since the magnetic flux density in the air gap of the above-mentioned centralized winding motor structure is not uniformly distributed, but changes periodically with the rotation of the rotor, the tooth-cutting structure 5 determined by the above formula can reduce the fluctuation amplitude of the magnetic flux density, allowing it to transition evenly to the next cycle, thereby reducing the cogging torque. In addition, the magnetic flux density harmonics in the air gap are relatively large, and the motor back EMF is not a typical sine wave, often containing multiple order harmonics. By determining the starting angle and slope of the tooth-cutting structure 5 according to the above formula, the non-sinusoidal components at the corresponding positions in the back EMF waveform can be removed, thereby improving the sinusoidality of the back EMF waveform.

[0050] In this embodiment, several stator laminations 1 are provided, and these stator laminations 1 are stacked axially to form a cylindrical shape. Each stator lamination 1 is fixedly connected to its adjacent stator lamination 1. Several rotor laminations 2 are provided, and these rotor laminations 2 are stacked axially to form a cylindrical shape. Each rotor lamination 2 is fixedly connected to its adjacent rotor lamination 2. Several permanent magnets 3 are disposed in the mounting slots of the rotor laminations 2. Through the above arrangement, a uniform air gap rotating magnetic field is formed, reducing the cogging torque of the motor and optimizing the output torque and improving the performance of the motor.

[0051] Based on the above, please refer to Figures 7 to 10 Compared with conventional solutions, the centralized winding motor structure using the proposed solution can control the back EMF harmonic content to within 1%. Specifically, the typical 5th harmonic is reduced from 3.1% to 0.7%, the 7th harmonic from 1.4% to 0.4%, and the 11th harmonic from 0.8% to 0.4%. Simultaneously, the pulsation of its cogging torque and load torque waveforms is also significantly improved, with the ratio of cogging torque to rated output torque controlled to within 1%, and torque pulsation reduced to within 3%.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A concentrated winding rotor lamination structure, characterized by, The application relates to a rotor lamination (2) provided with eccentric arc segments (6) on the outer periphery, wherein the eccentric arc segments (6) are provided with mounting grooves (7), and permanent magnets (3) are fixedly arranged in the mounting grooves (7). The stator lamination (1) is coaxially arranged with the rotor lamination (2), the inner wall of the stator lamination (1) is oppositely arranged with the outer wall of the rotor lamination (2), an air gap is left between the stator lamination (1) and the rotor lamination (2), and the inner periphery of the stator lamination (1) is annularly provided with stator teeth (4). The inner arc surface of the stator tooth (4) is symmetrically provided with a tooth cutting structure (5), the initial angle theta1 of the tooth cutting structure (5) satisfies the following relationship: theta1=360*f2 / (8p*a), wherein f2=0.30-0.42, p is the pole pair number of the motor, and a is the minimum air gap distance between the stator lamination (1) and the rotor lamination (2).

2. The concentrated-winding stator-rotor lamination structure of claim 1, characterized by: The slope theta2 of the tooth cutting structure (5) satisfies the following relationship: theta2=360*f2*(e / R) / (2p), wherein f2=0.30-0.42, e is the distance between the center of the eccentric arc segment (6) of the rotor lamination (2) and the standard center, and R is the maximum outer radius of the rotor lamination (2).

3. The concentrated-winding stator-rotor lamination structure of claim 1, wherein: The eccentricity e / R of the eccentric arc segment (6) and the maximum outer radius R of the rotor lamination (2) is defined as the eccentricity e / R, and the eccentricity e / R satisfies the following relationship: e / R=2L*f1*a / (p*T), wherein f1=0.4-0.6, T is the thickness of the permanent magnet (3), and L is the length of the permanent magnet (3).

4. The concentrated-winding stator-rotor lamination structure of claim 1, wherein: The rotor lamination (2) is provided with a plurality of rotor laminations (2), and the plurality of rotor laminations (2) are stacked in the axial direction to form a cylinder, each rotor lamination (2) is fixedly connected with the adjacent rotor lamination (2).

5. The concentrated-winding stator-rotor lamination structure of claim 1, wherein: The stator lamination (1) is provided with a plurality of stator laminations (1), and the plurality of stator laminations (1) are stacked in the axial direction to form a cylinder, each stator lamination (1) is fixedly connected with the adjacent stator lamination (1).

6. The concentrated-winding stator-rotor lamination structure of claim 1, wherein: The permanent magnet (3) is plate-shaped, and the permanent magnet (3) is provided with a plurality of permanent magnets (3).

7. The concentrated-winding stator-rotor lamination structure of claim 1, wherein: The mounting groove (7) is provided with a plurality of mounting grooves (7), and each mounting groove (7) is matched with the corresponding permanent magnet (3).

8. The concentrated-winding stator-rotor lamination structure of claim 1, wherein: ​

Images