CN216312775U - Stator punching sheet and electric pump applying same - Google Patents
Stator punching sheet and electric pump applying same Download PDFInfo
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- CN216312775U CN216312775U CN202122093194.2U CN202122093194U CN216312775U CN 216312775 U CN216312775 U CN 216312775U CN 202122093194 U CN202122093194 U CN 202122093194U CN 216312775 U CN216312775 U CN 216312775U
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Abstract
The utility model provides a stator punching sheet and an electric pump applying the same, wherein the stator punching sheet comprises an annular yoke part, a tooth part protruding from the inner wall of the yoke part to an axis and a tooth shoe arranged on one side of the tooth part far away from the yoke part, and the stator punching sheet is characterized in that: the radial cross section is the auxiliary groove of arc to the internal perisporium axial of tooth boots, and the auxiliary groove includes the first recess that is closest to tooth boots central line and uses tooth boots central line as the symmetric line, and the groove number of stator punching is n, and the angle phi between two notches is 360/n, and the contained angle that the central line of two first recesses formed is phi 1, and phi 1 is (0.125 ~ 0.151) phi. The number of the notches of the stator punching sheet is increased through the design, the greatest common divisor of the number of the slot poles is improved, the fundamental wave tooth-space torque periodicity is increased, and meanwhile, the position of the first groove is optimized, so that the amplitude and the torque pulsation of the tooth-space torque of the equipment which is required to be the stator punching sheet are reduced.
Description
Technical Field
The utility model relates to a stator punching sheet, in particular to an electric pump applying the stator punching sheet, wherein the IPC classification number of the stator punching sheet is F04D 13/06.
Background
Noise is caused by vibration, while common electric pump noise is caused by electromagnetic vibration noise, mechanical drive noise, and waterway noise, where the presence of cogging torque is the primary cause of electromagnetic vibration. The noise reduction scheme of the existing electric pump is that an auxiliary groove is formed in a stator punching sheet of the electric pump, and the structure of the auxiliary groove on the stator punching sheet has great influence on reduction of tooth space torque and torque pulsation, so that the existing scheme of reducing the tooth space torque and the torque pulsation is achieved without a better optimized auxiliary groove structure.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem that this application will be solved lies in providing a stator punching and uses this stator punching's charge pump, through carrying out optimal design to the auxiliary tank, takes off and reduces the effect of tooth's socket torque and torque ripple.
The technical scheme adopted by the utility model is as follows:
the utility model provides a stator punching, includes annular yoke portion, follows the bellied tooth portion of yoke portion inner wall to the axis and sets up in the tooth portion and keep away from the tooth boots of yoke portion one side, its characterized in that: the radial cross section is the auxiliary groove of arc to the internal perisporium axial of tooth boots, and the auxiliary groove includes the first recess that is closest to tooth boots central line and uses tooth boots central line as the symmetric line, and the groove number of stator punching is n, and the angle phi between two notches is 360/n, and the contained angle that the central line of two first recesses formed is phi 1, and phi 1 is (0.125 ~ 0.151) phi.
The stator punching sheet of the design is provided with the arc-shaped auxiliary grooves which are symmetrically arranged on the axial end face of the tooth shoe of the stator punching sheet. The number of the notches of the stator punching sheet is increased through the design, the greatest common divisor of the number of the slot poles is improved, the fundamental wave tooth-space torque periodicity is increased, and meanwhile, the position of the first groove is optimized, so that the amplitude and the torque pulsation of the tooth-space torque of the equipment which is required to be the stator punching sheet are reduced.
Furthermore, the auxiliary groove further comprises second grooves which are arranged on the outer sides of the two first grooves and take the center line of the tooth shoe as a symmetrical line, the included angle formed by the center lines of the two second grooves is phi 2, and phi 2 is (0.533-0.6) × phi.
Further, the width of the notch between adjacent tooth shoes is a, the radius of the first groove is R1, and R1 is (0.125-0.168) × a.
Furthermore, the radius of the second groove is R2, and R2 is (0.174-0.243) × a.
Further, the center of the auxiliary groove is located on the inner arc line L of the tooth shoe.
The utility model also provides an electric pump, which is characterized in that: the stator punching sheet comprises a stator core, a pump body, a rotor, an impeller and a pump cover, wherein the stator core, the pump body and the rotor are formed by overlapping any one of the stator punching sheets, the impeller is fixed on the rotor, the pump cover is fixed on the pump body, the pump body is provided with a sub-cavity and a rotor cavity, the stator core is fixedly arranged in the stator cavity, and the rotor is rotatably arranged on the rotor cavity.
According to the electric pump, the structure of the stator punching sheet is optimized, so that the cogging torque and the torque pulsation are reduced, and the effect of reducing the vibration of the electric pump during working is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a conventional stator punching sheet;
FIG. 2 is a schematic structural diagram of a stator lamination of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a graph showing the ratio of the angle formed by the center lines of two first grooves to the angle of two notches according to the present invention with respect to the torque ripple;
FIG. 5 is a graph showing the ratio of the angle formed by the center lines of two second grooves to the angle of two notches according to the present invention with respect to the torque ripple;
FIG. 6 is a graph of variation of the radius of the first groove and the width of the notch versus torque ripple;
FIG. 7 is a graph of the variation of the radius of the second groove and the width of the notch versus the torque ripple;
fig. 8 is a cross-sectional view of an electric pump employing the stator lamination of fig. 2;
wherein: 10-stator core, 20-pump body, 21-stator cavity, 22-rotor cavity, 30-rotor, 40-impeller, 50-pump cover, 10 '-wire passing groove, 100' -existing stator punching sheet, 100-stator punching sheet, 110-yoke part, 120-tooth part, 130-tooth shoe, 141-first groove and 142-second groove
Detailed Description
Fig. 1 shows a structure of a conventional stator lamination 100 ', and in order to facilitate winding of an enameled wire, a wire passing groove 10 ' is formed in the stator lamination 100 '. And because the arrangement of the wire passing groove 10 'enables the amplitude of the tooth space torque of the electric pump using the stator punching sheet 100' to be increased, the torque pulsation is also increased, the vibration of the electric pump operation is increased, and the working noise of the electric pump is increased.
Fig. 2 and 3 are schematic structural diagrams of the stator punching sheet of the present invention, which is optimized by adding an auxiliary groove in a common stator punching sheet. The concrete structure is as follows: a stator punching sheet comprises an annular yoke portion 110, a tooth portion 120 protruding from the inner wall of the yoke portion to the axis, and a tooth shoe 130 arranged on one side, far away from the yoke portion, of the tooth portion. The inner peripheral wall of the tooth shoe 130 is axially provided with an auxiliary groove having an arc-shaped radial section and taking the center line of the tooth shoe as a symmetry line, and the auxiliary groove is preferably semicircular. Referring to fig. 3, as a preferred embodiment of the present invention, the auxiliary groove includes a first groove 141 closest to the tooth shoe center line and having the tooth shoe center line as a symmetrical line. An included angle formed by the center lines of the two first grooves 141 is Φ 1, the number of slots of the stator lamination is assumed to be n (for example, see fig. 2, the number of slots of the stator lamination is 6), and the angle Φ between the two slots is 360/n. As shown in fig. 4, it is found through simulation calculation that the torque ripple of the electric pump to which the stator punching is applied is related to the position of the first groove, and when Φ 1 is (0.125-0.151) × Φ, the torque ripple value is small, so that the vibration of the electric pump to which the stator punching is applied during operation can be reduced.
The derivation process for reducing the amplitude and torque ripple of the magnetic slot torque by the number of the auxiliary slots is as follows:
1.1 cogging torque is defined as the negative derivative of magnetic field energy W with the electric pump not energized with respect to the stator-rotor position angle α, i.e.
1.2 the capacity of the magnetic field stored in the electric pump is approximately the sum of the capacity of the magnetic field stored in the air gap and permanent magnet of the electric pump, i.e.
Wherein mu0The magnetic permeability is vacuum magnetic permeability, and B is air gap magnetic density.
1.3 the distribution of the air gap flux density along the armature surface can be approximated as
Wherein B isr(theta) is the remanence of the permanent magnet, delta (theta, alpha) is the effective air gap length, hmAnd (theta) is the distribution of the permanent magnet magnetizing direction length along the circumferential risk, and theta is the relative position angle between the stator and the rotor.
1.4, see (2) and (3)
1.5, mixing Br 2(theta) and
fourier expansion separately, as follows:
1)Br 2fourier expansion of (theta) into
In the formula (I), the compound is shown in the specification,
wherein p is the number of pole pairs, BrIs remanence of permanent magnet, alphapIs the polar arc coefficient of the permanent magnet.
2) Irrespective of relative position of stator and rotorThe influence of (c). Assuming that the tooth center line is located at θ equal to 0, then
Fourier expansion as
Wherein z is the number of armature slots.
Taking into account the relative position between the permanent magnet and the armature teeth
Fourier expansion as
1.6, when m ≠ n, the integral of the trigonometric function within [0, 2 π ] satisfies the following formula
1.7, substituting expressions (4), (5) and (7) into (1), and obtaining an expression of cogging torque using expression (8)
In the formula, LaIs the axial length of the stator core, R1And R2Respectively arranging the outer radius of a stator core and the inner radius of the stator core, wherein n is an integer which enables nz/2p to be an integer;
when the number k of auxiliary grooves is an even number, G is a number which is not a multiple of (k +1)n＝0；
When n is a multiple of (k + 1):
in the formula [ theta ]s0The width of the slot in radian is shown, and k is the number of auxiliary slots formed on each stator tooth.
1.8, as can be seen from the cogging torque expression, the cogging torque is periodically changed, and the changed period number NpIs the ratio of the pole number 2p, the slot number z and the greatest common divisor GCD (z, 2p) of the pole number 2p, i.e.
That is, the greater the number of cycles, the greater the cogging torque magnitude
The smaller, i.e. when the number of poles of the motor is constant, the number of notches of the motor (auxiliary slots relative to notches) is increased, and the corresponding number of cogging torque cycles is increased relative to the number of cogging torque cycles
The smaller the magnitude of the cogging torque, and thus the cogging torque and the torque ripple are effectively reduced.
Further, referring to fig. 3, the auxiliary groove further includes a second groove 142 disposed outside the two first grooves 141 and having a tooth shoe center line as a symmetry line, and an included angle formed by center lines of the two second grooves 142 is Φ 2. According to the figure 5, simulation operation shows that the torque pulsation of the electric pump applying the stator punching sheet is related to the position of the second groove, and when phi 2 is (0.533-0.6) phi, the torque pulsation value of the electric pump during operation is smaller, so that the effect of reducing the operation vibration of the electric pump is achieved.
Further, through the operation of the simulation software, the cogging torque and the torque ripple are also related to the size of the arc radius of the first groove 141 and the second groove 142. Assuming a slot width a between adjacent tooth shoes, the radius of the first groove is R1 and the radius of the second groove is R2. Referring to fig. 6, according to simulation operation, when R1 is (0.125-0.168) × a, the torque ripple of the electric pump operation has a small and smooth value. Further, referring to fig. 7, when R2 is (0.174 to 0.243) a, the torque ripple value during the operation of the electric pump is also in a low value range, so that the operation vibration of the electric pump can be reduced.
Referring to fig. 2 and 3, the circle center of the auxiliary groove is preferably located on the inner arc line L of the tooth shoe, so that the material consumption of the stator punching sheet can be reduced.
Referring to fig. 8, the present invention further provides an electric pump using the stator lamination, the electric pump includes a stator core 10 formed by stacking the stator laminations 100, a pump body 20, a rotor 30, an impeller 40 fixed on the rotor, and a pump cover 50 fixed on the pump body, the pump body 20 defines a sub-cavity 21 and a rotor cavity 22, the stator core 10 is fixedly installed in the stator cavity 21, and the rotor 30 is rotatably installed on the rotor cavity 22.
According to the electric pump, the structure of the stator punching sheet is optimized, so that the cogging torque and the torque pulsation are reduced, and the effect of reducing the vibration of the electric pump during working is achieved.
According to the stator punching sheet, the arc-shaped auxiliary grooves are symmetrically arranged on the inner peripheral wall surface of the tooth shoe of the stator punching sheet, so that the number of notches of the stator punching sheet is increased, the greatest common divisor of the number of groove poles is increased, the periodic number of fundamental wave tooth socket torque is increased, and the positions and the sizes of the auxiliary grooves are optimized, so that the amplitude and the torque pulsation of the tooth socket torque of an electric pump of the stator punching sheet are reduced.
The following parameter comparison table is calculated by using simulation software applied to an electric pump with phi 1 being 8 degrees, phi 2 being 33.6 degrees, R1 being 0.47 degrees, R2 being 0.4 degrees, the inner diameter R3 of the stator lamination being 35mm, the outer diameter R4 being 60mm, and the outer diameter of the rotor being 30.5 mm.
Through the simulation comparison, when the stator punching sheet disclosed by the utility model is compared with the conventional stator punching sheet, the cogging torque is reduced by 78.35% and the torque pulsation is reduced by 60.60% while the torque output of an electric pump is not influenced. Therefore, the electric pump using the stator punching sheet can effectively reduce vibration during working.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (6)
1. The utility model provides a stator punching sheet, includes annular yoke portion (110), from bellied tooth portion (120) of yoke portion inner wall to axis and set up in tooth portion and keep away from tooth boots (130) of yoke portion one side, its characterized in that: the stator punching sheet is characterized in that an auxiliary groove with an arc-shaped radial section is axially arranged on the inner peripheral wall of the tooth shoe (130), the auxiliary groove comprises a first groove (141) which is closest to the center line of the tooth shoe and takes the center line of the tooth shoe as a symmetrical line, the number of the grooves of the stator punching sheet is n, the angle phi between two notches is 360/n, the included angle formed by the center lines of the two first grooves (141) is phi 1, and the phi 1 is (0.125-0.151) phi.
2. The stator lamination of claim 1, wherein: the auxiliary groove further comprises second grooves (142) which are arranged on the outer sides of the two first grooves (141) and take the tooth shoe center line as a symmetrical line, the included angle formed by the center lines of the two second grooves is phi 2, and phi 2 is (0.533-0.6) × phi.
3. The stator lamination of claim 1 or 2, wherein: the width of a notch between the adjacent tooth shoes is a, the radius of the first groove is R1, and R1 is (0.125-0.168). a.
4. The stator lamination of claim 2, wherein: the radius of the second groove is R2, and R2 is (0.174-0.243) a.
5. The stator lamination of claim 1, wherein: the circle center of the auxiliary groove is positioned on the inner arc line L of the tooth boot.
6. An electric pump characterized by: the stator punching sheet structure comprises a stator core (10) formed by stacking stator punching sheets (100) according to any one of claims 1 to 5, a pump body (20), a rotor (30), an impeller (40) fixed on the rotor and a pump cover (50) fixed on the pump body, wherein the pump body (20) is provided with a sub-cavity (21) and a rotor cavity (22), the stator core (10) is fixedly installed in the stator cavity (21), and the rotor (30) is rotatably installed on the rotor cavity (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122093194.2U CN216312775U (en) | 2021-09-01 | 2021-09-01 | Stator punching sheet and electric pump applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122093194.2U CN216312775U (en) | 2021-09-01 | 2021-09-01 | Stator punching sheet and electric pump applying same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216312775U true CN216312775U (en) | 2022-04-15 |
Family
ID=81087529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122093194.2U Active CN216312775U (en) | 2021-09-01 | 2021-09-01 | Stator punching sheet and electric pump applying same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216312775U (en) |
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2021
- 2021-09-01 CN CN202122093194.2U patent/CN216312775U/en active Active
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