Stator combined slot type submersible permanent magnet motor and stator silicon steel sheet parameter design method thereof

Abstract

The application provides a stator combined slot type submersible permanent magnet motor and a stator silicon steel sheet parameter design method thereof, and relates to the technical field of permanent magnet motors.The motor comprises a stator, a rotor and a righting bearing.The stator silicon steel sheet is provided with six deep slot grooves and a plurality of shallow slot grooves in the circumferential direction, the six deep slot grooves are uniformly distributed in the circumferential direction, the anti-rotation card of the righting bearing is clamped into the deep slot grooves, and the shallow slot grooves limit the anti-rotation card from entering; the two sides of the deep slot grooves are narrow stator teeth, and at least one side of the shallow slot grooves is wide stator teeth, so that the deep slot grooves and the shallow slot grooves can accommodate the same conductor.The motor can simultaneously reduce the torque fluctuation caused by the anti-rotation grooves and the single-sided magnetic pull.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor technology, and in particular to a stator combined slot submersible permanent magnet motor and a method for designing the parameters of its stator silicon steel sheets. Background Technology

[0002] Submersible electric pump (ESP) systems are typically installed inside the well casing, placing high demands on the outer diameter, power density, operating efficiency, and long-term reliability of the drive motor. Permanent magnet synchronous motors (PMSMs) offer high efficiency, power factor, and power density, enabling them to enhance the driving capability of ESP systems within confined downhole installation space while reducing power supply capacity and operating losses. Therefore, they are increasingly being used in ESP drive applications.

[0003] In submersible permanent magnet motors, the rotor typically needs to maintain a fit with the inner circle of the stator via a centering bearing or a sliding bearing. To prevent the centering bearing from rotating with the rotor, some existing submersible permanent magnet motors have anti-rotation slots, positioning slots, or similar slot structures in the stator laminations, the inner circle of the stator core, or related mating parts, allowing the anti-rotation clips on the centering bearing to engage in the corresponding slots. While these structures meet the anti-rotation fit requirements, the anti-rotation slots alter the circumferential distribution of the slot openings in the stator's inner circle, causing localized unevenness in the air gap magnetic permeability and stator tooth structure. When the rotor is eccentric due to sliding bearing support, this localized unevenness is more likely to cause fluctuations in cogging torque and electromagnetic torque, as well as an increase in unilateral magnetic pull.

[0004] Existing anti-rotation slot structures for submersible permanent magnet motors typically focus on anti-rotation limiting and assembly reliability, with insufficient consideration given to the number of anti-rotation slots, their circumferential position, slot depth, and the electromagnetic impact of the anti-rotation card entering the slot. While later designs addressed the motor's electromagnetic performance, they lacked comprehensive consideration; for example, reducing the motor's cogging torque resulted in increased unilateral magnetic pull. Therefore, existing structures still struggle to simultaneously achieve the anti-rotation fit of the centering bearing, consistent conductor arrangement within the stator slots, cogging torque suppression, and reduction of unilateral magnetic pull. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the purpose of this invention is to provide a stator combined slot submersible permanent magnet motor and its stator silicon steel sheet parameter design method, so as to solve the torque fluctuation or unilateral magnetic pull problem caused by the anti-rotation slot of the traditional submersible permanent magnet motor, and simultaneously reduce torque fluctuation and unilateral magnetic pull, improve the smoothness of motor operation and reduce the wear of the straightening bearing.

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

[0007] A stator-combined slotted submersible permanent magnet motor includes a stator, a rotor, and a centering bearing. The rotor is placed inside the stator cavity, and the centering bearing is mounted on the rotor. The outer edge of the centering bearing has a clearance fit with the inner circle of the stator. The stator includes stator silicon steel sheets and a housing. Multiple stator silicon steel sheets are stacked and pressed into the housing. The centering bearing includes an anti-rotation clip and a spring. The stator silicon steel sheets have multiple slots distributed along the circumference. The multiple slots include six deep slots and multiple shallow slots. The six deep slots are evenly distributed around the circumference. The distance between two adjacent deep slots is... At least one shallow slot is provided; the anti-rotation card protrudes from the outer edge of the straightening bearing under the action of the spring and is inserted into the opening of the deep slot; the width of the deep slot is greater than the width of the anti-rotation card, and the width of the shallow slot is less than the width of the anti-rotation card, so as to restrict the anti-rotation card from entering the shallow slot; the two sides of the deep slot are narrow stator teeth, and one side of the shallow slot has at least one wide stator tooth. The widths of the narrow stator teeth and the wide stator teeth are matched so that the deep slot and the shallow slot can accommodate the same number of conductors with the same diameter.

[0008] Preferably, the stator silicon steel sheet has 6k+6 slots distributed on it, where k is a positive integer; the slots include 6 deep slots and 6k shallow slots, with k shallow slots evenly distributed between two adjacent deep slots.

[0009] Preferably, the included angle between two adjacent deep grooves is 60°, and the included angle between the centerlines of two adjacent grooves is θ. .

[0010] Preferably, the deep groove, the shallow groove, and the anti-rotation card satisfy the following width relationship: 0≤W2<W3<W1; where W1 is the groove width of the deep groove, W2 is the groove width of the shallow groove, and W3 is the width of the anti-rotation card.

[0011] Preferably, the deep groove and the anti-rotation card satisfy the following height relationship: H3 < H1; where H1 is the groove opening height of the deep groove and H3 is the protrusion height of the anti-rotation card.

[0012] Preferably, the groove opening height H2 of the shallow groove satisfies: 0.3mm < H2 < 1mm.

[0013] Preferably, the width of the narrow stator tooth is t1, the width of the wide stator tooth is t2, t2 is greater than t1, and t1 and t2 are used to make the deep slot and the shallow slot form slot spaces for embedding conductors of the same number and the same diameter.

[0014] Preferably, the same number of conductors are placed in both the deep and shallow slots, and the conductors have the same diameter.

[0015] Preferably, the centering bearing includes an outer sleeve and an inner sleeve, and the anti-rotation clip always protrudes from the outer edge of the centering bearing due to the elastic force of the spring, and the deep groove serves as the anti-rotation clip groove of the centering bearing.

[0016] A method for designing stator silicon steel sheet parameters in a stator-combined slotted submersible permanent magnet motor, used to determine the stator silicon steel sheet parameters in the aforementioned stator-combined slotted submersible permanent magnet motor, the method comprising:

[0017] Based on the width and protrusion height of the anti-rotation card of the straightening bearing, determine the groove width and groove height of the deep groove, and set the groove width and groove height of the shallow groove, so that the groove width of the deep groove is greater than the width of the anti-rotation card, the groove width of the shallow groove is less than the width of the anti-rotation card, and the groove height of the deep groove is greater than the protrusion height of the anti-rotation card.

[0018] Establish a finite element model of the motor including deep slots, shallow slots, narrow stator teeth, and wide stator teeth, and calculate the electromagnetic torque of the motor finite element model;

[0019] With the goal of increasing electromagnetic torque, the width of the narrow stator teeth and the width of the wide stator teeth are adjusted, and the width parameters of the narrow stator teeth and the wide stator teeth are determined.

[0020] After determining the width parameters of the narrow stator teeth and the wide stator teeth, adjust the slot width and slot height of the shallow slot, and calculate the corresponding cogging torque and ripple torque.

[0021] With the goal of reducing the fluctuations in cogging torque and ripple torque, the groove width and groove height parameters of the shallow groove are determined.

[0022] The present invention discloses the following beneficial effects:

[0023] This invention provides deep grooves evenly distributed along the circumference and shallow grooves located between adjacent deep grooves on the stator silicon steel sheet. This allows the anti-rotation clip of the centering bearing to engage in the deep grooves, while the shallow grooves prevent the anti-rotation clip from accidentally entering other grooves. This satisfies the anti-rotation fitting requirements of the centering bearing, improves the uniformity of the stator groove distribution along the circumference, and reduces the local disturbance of the anti-rotation clips to the air gap magnetic permeability and tooth groove structure.

[0024] Under the same permanent magnet rotor conditions, compared with traditional 2-anti-rotation slot submersible permanent magnet motors and traditional 3-anti-rotation slot submersible permanent magnet motors, the submersible permanent magnet motor of the present invention can reduce cogging torque and electromagnetic torque fluctuations. Specifically, the cogging torque is reduced to 42% of that of the traditional 2-anti-rotation slot motor and 62% of that of the traditional 3-anti-rotation slot motor, respectively, and the electromagnetic torque fluctuation is reduced to 47% of that of the traditional 2-anti-rotation slot motor and 56% of that of the traditional 3-anti-rotation slot motor, respectively. The average electromagnetic torque is reduced by only about 2%, which is beneficial to improving the smoothness of motor operation.

[0025] Meanwhile, the six deep slots are evenly distributed around the circumference, maintaining good circumferential symmetry in the stator slot structure. Compared with traditional three-anti-rotation slot submersible permanent magnet motors, this invention can reduce unilateral magnetic pull under both no-load and load conditions, thereby mitigating uneven stress and wear risk on the centering bearing, and improving the operational reliability and service life of the submersible permanent magnet motor. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a structural diagram of a submersible permanent magnet motor provided in an embodiment of the present invention;

[0028] Figure 2 This is a diagram showing the fit between the stator and the centering bearing of a submersible permanent magnet motor provided in an embodiment of the present invention.

[0029] Figure 3 This is a diagram of the silicon steel sheet of the stator of a submersible permanent magnet motor provided in an embodiment of the present invention;

[0030] Figure 4 A diagram of the centering bearing for a submersible permanent magnet motor provided in an embodiment of the present invention;

[0031] Figure 5 A diagram of a stator silicon steel sheet equipped with conductors for a submersible permanent magnet motor provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the existing two-proof rotating slot stator silicon steel sheet structure;

[0033] Figure 7 This is a schematic diagram of the existing three-proof rotating slot stator silicon steel sheet structure;

[0034] Figure 8 A schematic diagram comparing the cogging torque of a motor provided in an embodiment of the present invention with that of a conventional motor;

[0035] Figure 9 A schematic diagram comparing the electromagnetic torque of a motor and an existing motor provided in an embodiment of the present invention; Figure 10 A schematic diagram comparing the unloaded unilateral magnetic pull force of the motor provided in this embodiment of the invention with that of an existing motor; Figure 11 A magnified comparison diagram of the unloaded unilateral magnetic pull force of a motor and an existing motor provided in an embodiment of the present invention; Figure 12A schematic diagram comparing the overall load-side magnetic pull force of the motor provided in this embodiment of the invention with that of an existing motor; Figure 13 This is a magnified comparison diagram of the load-side magnetic pull force of a motor and an existing motor, provided in an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Stator; 11. Stator silicon steel sheet; 12. Housing; 111. Deep slot; 112. Shallow slot; 113. Narrow stator tooth; 114. Wide stator tooth; 2. Rotor; 3. Centering bearing; 31. Anti-rotation clip; 32. Spring; 4. Conductor; 5. Existing anti-rotation clip slot. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 As shown, the stator-combined slotted submersible permanent magnet motor of this embodiment includes a stator 1, a rotor 2, and a centering bearing 3. The rotor 2 is placed inside the cavity of the stator 1, and multiple centering bearings 3 are disposed on the rotor 2. The outer edge of the centering bearing 3 is clearance-fitted with the inner circle of the stator 1; in one embodiment, the single-sided clearance between the outer edge of the centering bearing 3 and the inner circle of the stator 1 is 0.04 mm to 0.08 mm. The stator 1 includes stator silicon steel sheets 11 and a housing 12, with multiple stator silicon steel sheets 11 stacked and pressed into the housing 12. The centering bearing 3 includes an outer sleeve and an inner sleeve. Figure 2 The fit between the outer sleeve of the centering bearing 3 and the stator silicon steel sheet 11 is shown. For example... Figure 4 As shown, the centering bearing 3 includes an anti-rotation card 31 and a spring 32. The anti-rotation card 31 protrudes from the outer edge of the centering bearing 3 by the elastic force of the spring 32.

[0041] like Figure 2 and Figure 3As shown, the stator silicon steel sheet 11 has multiple grooves distributed along the circumference. These grooves include six deep grooves 111 and multiple shallow grooves 112. The six deep grooves 111 are evenly distributed around the circumference, and at least one shallow groove 112 is provided between any two adjacent deep grooves 111. The anti-rotation clip 31 of the centering bearing 3 engages with the opening of the deep groove 111, enabling the deep groove 111 to achieve an anti-rotation fit for the centering bearing 3. Figure 3 In this context, LC represents the centerline of the groove.

[0042] In one embodiment, the stator silicon steel sheet 11 has 6k+6 slots, where k is a positive integer; 6 slots are deep-mouth slots 111, and 6k slots are shallow-mouth slots 112, with k shallow-mouth slots 112 evenly distributed between any two adjacent deep-mouth slots 111. The included angle between any two adjacent deep-mouth slots 111 is 60°, and the included angle between the centerlines of any two adjacent slots is 360° / (6k+6). For example, when the stator silicon steel sheet 11 has a 12-slot structure, k is 1, and one shallow-mouth slot 112 is evenly distributed between any two adjacent deep-mouth slots 111; when the stator silicon steel sheet 11 has an 18-slot structure, k is 2, and two shallow-mouth slots 112 are evenly distributed between any two adjacent deep-mouth slots 111; when the stator silicon steel sheet 11 has a 24-slot structure, k is 3, and three shallow-mouth slots 112 are evenly distributed between any two adjacent deep-mouth slots 111. The above relationship between the number of slots and the circumferential arrangement helps to maintain the circumferential symmetry of the stator slot structure.

[0043] like Figure 3 As shown, the deep slot 111 has narrow stator teeth 113 on both sides, while the shallow slot 112 has at least one wide stator tooth 114 on one side. The width of the wide stator tooth 114 is greater than the width of the narrow stator tooth 113. The widths of the narrow stator tooth 113 and the wide stator tooth 114 match, allowing the deep slot 111 and the shallow slot 112 to form a slot space for accommodating the same number of conductors 4 of the same diameter. Figure 5 As shown, the same number of conductors 4 are placed in both the deep groove 111 and the shallow groove 112, and the conductors 4 have the same diameter.

[0044] like Figure 4 As shown, the width of the anti-rotation card 31 of the centering bearing 3 is W3, and the protrusion height of the anti-rotation card 31 is H3. (As shown...) Figure 3As shown, the width of the deep slot 111 is W1, and the height of the deep slot 111 is H1; the width of the shallow slot 112 is W2, and the height of the shallow slot 112 is H2. The deep slot 111, the shallow slot 112, and the anti-rotation card 31 satisfy the width relationship 0 ≤ W2 < W3 < W1. Based on this width relationship, the anti-rotation card 31 can enter the opening of the deep slot 111 and is restricted from entering the shallow slot 112, thereby reducing the risk of the anti-rotation card 31 accidentally entering the shallow slot 112 and damaging the conductor 4 inside the slot. The height relationship between the deep slot 111 and the anti-rotation card 31 satisfies H3 < H1, ensuring that the anti-rotation card 31 avoids the conductor 4 inside the deep slot 111 when it is inserted into the deep slot 111. In one embodiment, the height H2 of the shallow slot 112 satisfies 0.3 mm < H2 < 1 mm.

[0045] As a specific method for designing stator silicon steel sheet parameters, this embodiment determines the relevant parameters of stator silicon steel sheet 11 according to the following steps.

[0046] Based on the width W3 and protrusion height H3 of the anti-rotation card 31 of the centering bearing 3, the groove width W1 and groove height H1 of the deep groove 111 are determined, and the groove width W2 and groove height H2 of the shallow groove 112 are set, so that the deep groove 111, the shallow groove 112, and the anti-rotation card 31 satisfy the width relationship 0≤W2<W3<W1, and the deep groove 111 and the anti-rotation card 31 satisfy the height relationship H3

[0047] A finite element model of the motor is established, comprising deep slot 111, shallow slot 112, narrow stator teeth 113, and wide stator teeth 114, and the electromagnetic torque of the motor finite element model is calculated. Based on the electromagnetic torque, the width t1 of the narrow stator teeth 113 and the width t2 of the wide stator teeth 114 are adjusted to determine the width parameters of the narrow stator teeth 113 and the wide stator teeth 114 with the goal of increasing the electromagnetic torque.

[0048] After determining the widths t1 and t2, the slot width W2 and slot height H2 of the shallow slot 112 are adjusted, and the cogging torque and ripple torque corresponding to different slot widths W2 and slot heights H2 are calculated. With the goal of reducing the fluctuations in cogging torque and ripple torque, the slot width W2 and slot height H2 of the shallow slot 112 are determined. This ensures that the stator silicon steel sheet 11 meets the anti-rotation fitting requirements of the centering bearing 3 while also achieving consistency in the arrangement of the conductors 4 within the slot, suppression of cogging torque, and reduction of ripple torque fluctuations.

[0049] ​Furthermore, to illustrate the technical effects of the present invention, based on the same permanent magnet rotor, the torque and unilateral magnetic pull of the stator combination slot submersible permanent magnet motor of the present invention, the existing two-proof rotating slot submersible permanent magnet motor, and the existing three-proof rotating slot submersible permanent magnet motor are compared and analyzed. For example... Figure 6 and Figure 7 As shown, both the existing anti-rotation slots 5 and the existing three-anti-rotation slots stator silicon steel sheets are equipped with existing anti-rotation slots.

[0050] like Figure 8 As shown (dashed lines represent existing dual-anti-rotation slot submersible permanent magnet motors, and thick solid lines represent existing triple-anti-rotation slot submersible permanent magnet motors), the existing dual-anti-rotation slot submersible permanent magnet motors, due to the presence of two existing anti-rotation slots 5, will affect the circumferential uniformity of the stator slot structure, thereby increasing the cogging torque. For example... Figure 9 As shown, the electromagnetic torque fluctuation of the existing anti-rotation slot submersible permanent magnet motor increases accordingly. In this embodiment, by evenly distributing six deep slots 111 around the circumference and setting shallow slots 112 between adjacent deep slots 111, the influence of the anti-rotation slot structure on the circumferential uniformity of the stator slots can be reduced, thereby reducing cogging torque and electromagnetic torque fluctuation.

[0051] like Figure 10 and Figure 11 As shown, under no-load conditions, the single-sided magnetic pull of the existing three-proof rotating slot submersible permanent magnet motor is significantly higher than that of the stator combination slot submersible permanent magnet motor of this embodiment. Figure 11 right Figure 10 The low unilateral magnetic pull region is magnified to show the differences between this embodiment and existing dual-proof rotary slot submersible permanent magnet motors and existing triple-proof rotary slot submersible permanent magnet motors in the low unilateral magnetic pull range. For example... Figure 12 and Figure 13 As shown, under load, the existing three-proof rotary slot submersible permanent magnet motor still has a large unilateral magnetic pull force; Figure 13 right Figure 12 The low unilateral magnetic pull area is magnified locally to show the local differences in unilateral magnetic pull of each motor under load. Therefore, this embodiment can reduce unilateral magnetic pull while reducing cogging torque and electromagnetic torque fluctuations, thereby alleviating uneven stress and wear on the centering bearing 3.

[0052] In summary, this invention, by providing circumferentially distributed deep slots 111 and shallow slots 112 located between adjacent deep slots 111 on the stator silicon steel sheet 11, allows the anti-rotation card 31 to engage in the deep slots 111 and restricts its entry into the shallow slots 112. Simultaneously, the width matching of the narrow stator teeth 113 and the wide stator teeth 114 allows the deep slots 111 and shallow slots 112 to accommodate the same number and diameter of conductors 4. Therefore, this invention can meet the anti-rotation fitting requirements of the centering bearing 3 while reducing the impact of the anti-rotation fitting slot structure on the circumferential uniformity of the stator slots, thereby reducing cogging torque, electromagnetic torque fluctuations, and unilateral magnetic pull, alleviating wear on the centering bearing 3, and improving the operational stability and reliability of the submersible permanent magnet motor.

[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0054] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A stator-combined slotted submersible permanent magnet motor, comprising a stator, a rotor, and a centering bearing, wherein the rotor is placed in the inner cavity of the stator, the centering bearing is disposed on the rotor, the outer edge of the centering bearing is clearance-fitted with the inner circle of the stator, the stator comprises stator silicon steel sheets and a housing, multiple stator silicon steel sheets are stacked and pressed into the housing, and the centering bearing comprises an anti-rotation clip and a spring, characterized in that... The stator silicon steel sheet has multiple grooves distributed along the circumference. The multiple grooves include 6 deep grooves and multiple shallow grooves. The 6 deep grooves are evenly distributed around the circumference. At least one shallow groove is provided between two adjacent deep grooves. The anti-rotation clip protrudes from the outer edge of the centering bearing under the action of the spring and is engaged in the groove of the deep groove. The width of the deep slot is greater than the width of the anti-rotation card, and the width of the shallow slot is less than the width of the anti-rotation card, so as to restrict the anti-rotation card from entering the shallow slot; the two sides of the deep slot are narrow stator teeth, and one side of the shallow slot has at least one wide stator tooth. The widths of the narrow stator teeth and the wide stator teeth are matched so that the deep slot and the shallow slot can accommodate the same number of conductors with the same diameter. The deep groove and the anti-rotation card satisfy the following height relationship: H3 < H1; where H1 is the groove opening height of the deep groove and H3 is the protrusion height of the anti-rotation card.

2. The stator combined slotted submersible permanent magnet motor according to claim 1, characterized in that, The stator silicon steel sheet has 6k+6 grooves distributed on it, where k is a positive integer; the grooves include 6 deep grooves and 6k shallow grooves, with k shallow grooves evenly distributed between two adjacent deep grooves.

3. The stator-combined slotted submersible permanent magnet motor according to claim 2, characterized in that, The included angle between two adjacent deep grooves is 60°, and the included angle between the centerlines of two adjacent grooves is θ. .

4. The stator combined slotted submersible permanent magnet motor according to claim 1, characterized in that, The deep groove, the shallow groove, and the anti-rotation card satisfy the following width relationship: 0≤W2<W3<W1; Wherein, W1 is the width of the deep groove, W2 is the width of the shallow groove, and W3 is the width of the anti-rotation card.

5. The stator combined slotted submersible permanent magnet motor according to claim 1, characterized in that, The groove opening height H2 of the shallow groove satisfies: 0.3mm < H2 < 1mm.

6. The stator combined slotted submersible permanent magnet motor according to claim 1, characterized in that, The width of the narrow stator tooth is t1, and the width of the wide stator tooth is t2, where t2 is greater than t1. Through t1 and t2, the deep slot and the shallow slot respectively form slot spaces for embedding conductors of the same number and diameter.

7. The stator combined slotted submersible permanent magnet motor according to claim 1, characterized in that, Both the deep and shallow slots contain the same number of conductors, and the conductors have the same diameter.

8. The stator combined slotted submersible permanent magnet motor according to claim 1, characterized in that, The straightening bearing includes an outer sleeve and an inner sleeve. The anti-rotation clip always protrudes from the outer edge of the straightening bearing due to the elastic force of the spring. The deep groove serves as the anti-rotation clip groove of the straightening bearing.

9. A method for designing the stator silicon steel sheet parameters of a stator combined slotted submersible permanent magnet motor, characterized in that, The method for determining the stator silicon steel sheet parameters in the stator combined slotted submersible permanent magnet motor according to any one of claims 1 to 8 includes: Based on the width and protrusion height of the anti-rotation card of the straightening bearing, determine the groove width and groove height of the deep groove, and set the groove width and groove height of the shallow groove, so that the groove width of the deep groove is greater than the width of the anti-rotation card, the groove width of the shallow groove is less than the width of the anti-rotation card, and the groove height of the deep groove is greater than the protrusion height of the anti-rotation card. Establish a finite element model of the motor that includes the deep slot, the shallow slot, the narrow stator teeth, and the wide stator teeth, and calculate the electromagnetic torque of the finite element model of the motor. With the goal of increasing the electromagnetic torque, the width of the narrow stator teeth and the width of the wide stator teeth are adjusted, and the width parameters of the narrow stator teeth and the wide stator teeth are determined. After the width parameters of the narrow stator teeth and the wide stator teeth are determined, the slot width and slot height of the shallow slot are adjusted, and the corresponding cogging torque and ripple torque are calculated. With the goal of reducing the fluctuations of the cogging torque and the ripple torque, the groove width and groove height parameters of the shallow groove are determined.

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