Half-split motor stator structure using concentrated winding
By adopting a split-half motor stator structure with concentrated windings, the problems of magnetic field imbalance and circulating current in marine motors are solved, achieving more efficient and stable motor operation, which is particularly suitable for marine environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-21
- Publication Date
- 2026-03-17
AI Technical Summary
The existing marine bearing motor stator winding uses distributed winding, which leads to magnetic field imbalance, large circulating current, severe heat generation, low core utilization, and uneven magnetic field distribution, affecting the motor's operating stability and torque accuracy.
The stator structure of the motor adopts a split-half winding with concentrated windings. By precisely setting the parting surface of the upper and lower half stator at the center of the stator slot, it is ensured that each slot is a complete slot and the windings are symmetrically distributed. Combined with the heat dissipation pipe design, the core utilization rate and magnetic field uniformity are improved.
It eliminates magnetic field imbalance and circulating current, reduces heat generation, improves motor efficiency and reliability, enhances magnetic field and electromagnetic torque, reduces cogging torque and noise, and makes the motor run more smoothly and quietly.
Smart Images
Figure CN121689602A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of stator, in particular to a half split motor stator structure using concentrated winding. BACKGROUND
[0002] The stator and rotor are the core components of the motor, which work together as fixed and rotating parts, respectively. The stator is composed of a stator core (silicon steel sheet lamination), a stator winding (such as a three-phase winding), and a machine base (cast iron or cast steel). The winding is divided into two types: concentrated winding and distributed winding. Concentrated winding is applied to salient pole stators, usually wound into rectangular coils, wrapped and shaped with yarn tape, and then embedded in the core of the convex magnetic pole after dipping paint and drying treatment. The excitation coil of the general commutator motor (including DC motor and general motor) and the main pole winding of the single-phase shield pole motor all use concentrated winding.
[0003] Currently, the stator winding of the ship's shaft motor uses distributed winding. The two element edge spans of the distributed winding coil are generally 5. In order to meet the half split condition, there is a pole without embedded winding near the parting surface, which causes the imbalance of the magnetic field. When using multiple parallel connections, there is a circulating current in the parallel branch. The more the number of parallel branches, the larger the unbalanced circulating current, and the more the heat generated by the motor. Because there is no winding under two poles in the entire motor, the output of the motor is also reduced. When using concentrated winding, there is no air gap between the upper and lower stators, and the utilization rate of the core is insufficient. Due to the existence of the air gap, the magnetic circuit inside the motor is not symmetrical, and the magnetic field distribution is not uniform. This not only produces additional vibration and noise, but also seriously affects the running stability and torque accuracy of the motor. SUMMARY
[0004] The present application provides a half split motor stator structure using concentrated winding, which solves the problem of more parallel branches, larger unbalanced circulating current, more heat generated by the motor, no air gap between the upper and lower stators, insufficient utilization rate of the core, and asymmetric magnetic circuit inside the motor.
[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: The application discloses a half-split motor stator structure using concentrated windings, which comprises a complete stator core composed of an upper half stator and a lower half stator, wherein the bottom plane of the upper half stator is an upper split surface, the inner wall of the upper half stator is provided with a plurality of circumferentially distributed upper stator slots, and the plurality of upper stator slots divide the inner wall of the upper half stator into a plurality of upper stator teeth; the top plane of the lower half stator is a lower split surface, the inner wall of the lower half stator is provided with a plurality of circumferentially distributed lower stator slots, and the plurality of lower stator slots divide the inner wall of the lower half stator into a plurality of lower stator teeth; the upper split surface and the lower split surface are completely coincident, and the two ends of the upper split surface and the lower split surface are located at the center positions of the stator slots; two upper stator slots at the upper split surface and two lower stator slots at the lower split surface form two complete stator slots; the stator core is provided with a plurality of circumferentially distributed concentrated windings; and the upper half stator and the lower half stator are both provided with heat dissipation pipes.
[0006] Preferably, the upper half stator is formed by laminating a plurality of silicon steel sheets, the upper split surface is a finely processed smooth plane, the magnetic resistance is reduced, and the magnetic circuit is continuous; the inner walls of the plurality of upper half stator slots and the outer walls of the plurality of upper stator teeth are both sprayed with wear-resistant insulating paint; and the upper half stator is provided with a plurality of upper mounting holes in the outer wall of the upper half stator.
[0007] Preferably, the lower half stator is formed by laminating a plurality of silicon steel sheets, the lower split surface is a finely processed smooth plane; the inner walls of the plurality of lower half stator slots and the outer walls of the plurality of lower stator teeth are both sprayed with wear-resistant insulating paint; and the lower half stator is provided with a plurality of lower mounting holes in the outer wall of the lower half stator.
[0008] Preferably, two upper positioning pins are welded on the outer wall of the upper split surface in a diagonal direction, and two upper positioning holes are formed in the outer wall of the upper split surface in a diagonal direction.
[0009] Preferably, two lower positioning pins are welded on the outer wall of the lower split surface in a diagonal direction, and two lower positioning holes are formed in the outer wall of the lower split surface in a diagonal direction; the two upper positioning pins are respectively inserted into the two lower positioning holes, and the two lower positioning pins are respectively inserted into the two upper positioning holes; and the upper half stator and the lower half stator are fixed by a plurality of bolts.
[0010] Preferably, the inner walls of the plurality of upper stator slots and the plurality of lower stator slots are both inserted with insulating paper in a U-shaped structure, and the inner walls of the two sides of the concentrated windings abut against the inner walls of the two insulating papers.
[0011] Preferably, the heat dissipation pipes comprise a plurality of heat exchange pipes and a plurality of connection pipes in a semicircular structure; the plurality of heat exchange pipes are respectively inserted into the plurality of upper mounting holes and the plurality of lower mounting holes; and the plurality of connection pipes are respectively welded on the outer walls of one ends of the plurality of heat exchange pipes.
[0012] The application has the following beneficial effects: 1. By setting the parting surface accurately at the center of each stator slot, the upper and lower half stators are combined, each slot is complete without any empty slot, and the winding distribution under all poles is completely symmetrical, thereby eliminating the magnetic field imbalance problem caused by the magnetic circuit asymmetry from the source, which makes the potential of each branch equal in the multi-parallel design, basically eliminates the harmful circulating current, reduces the heat generation, and improves the efficiency and reliability of the motor.
[0013] 2. Since all stator slots are fully utilized, the effective magnetic area of the core is maximized, and under the same volume and material usage, the motor can generate a stronger magnetic field and larger electromagnetic torque, significantly improving the power and torque density of the motor.
[0014] 3. Concentrated winding is essentially fractional slot winding, which can effectively weaken the tooth harmonic content of the magnetic field, thereby greatly reducing the cogging torque and torque ripple, making the motor more stable and quiet during startup and low-speed operation, improving the control performance, and is particularly suitable for harsh marine environments with strict requirements on vibration and noise.
[0015] In summary, the present application has the advantages of equal potential of each branch, basically eliminating the harmful circulating current, reducing the heat generation, improving the efficiency and reliability of the motor, enabling the motor to generate a stronger magnetic field and larger electromagnetic torque, effectively weakening the tooth harmonic content of the magnetic field, thereby greatly reducing the cogging torque and torque ripple, making the motor more stable and quiet during startup and low-speed operation. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 An overall front view structural schematic diagram of a half-split motor stator structure using concentrated winding is proposed for the present application.
[0017] Figure 2 An upper half stator bottom view structural schematic diagram of a half-split motor stator structure using concentrated winding is proposed for the present application.
[0018] Figure 3 A lower half stator front view structural schematic diagram of a half-split motor stator structure using concentrated winding is proposed for the present application.
[0019] Figure 4 An overall front view structural schematic diagram of a half-split motor stator structure using concentrated winding is proposed for the present application. Figure 1 An enlarged structural schematic diagram of position A in the above figure.
[0020] Figure 5 A front view structural schematic diagram of a heat dissipation pipe of a half-split motor stator structure using concentrated winding is proposed for the present application.
[0021] In the figure: 1, upper half stator; 11, upper parting surface; 12, upper stator slot; 13, upper stator tooth; 14, upper mounting hole; 2, upper positioning pin; 3, upper positioning hole; 4, lower half stator; 41, lower parting surface; 42, lower stator slot; 43, lower stator tooth; 44, lower mounting hole; 5, lower positioning pin; 6, lower positioning hole; 7, insulating paper; 8, concentrated winding; 9, heat dissipation pipe. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.
[0023] Embodiment 1, refer to Figures 1-4A kind of half motor stator structure using concentrated winding, including complete stator core consisting of upper half stator 1 and lower half stator 2, upper half stator 1 is formed by a plurality of silicon steel sheet laminated, the bottom plane of upper half stator 1 is smooth upper parting surface 11, the magnetic resistance is reduced, the magnetic circuit is kept continuous, several upper stator slots 12 are opened on the inner wall of upper half stator 1, several upper stator slots 12 separate the inner wall of upper half stator 1 into a plurality of upper stator teeth 13, several upper half stator slots 12 inner wall and several upper stator teeth 13 outer wall are all sprayed with wear-resistant insulating paint, several upper mounting holes 14 are opened on the outer wall of the upper part of upper half stator 1, lower half stator 2 is formed by a plurality of silicon steel sheet laminated, the top plane of lower half stator 2 is also smooth lower parting surface 21, several circumferentially distributed lower stator slots 22 are opened on the inner wall of lower half stator 2, several lower stator slots 22 separate the inner wall of lower half stator 2 into a plurality of lower stator teeth 23, several lower half stator slots 22 inner wall and several lower stator teeth 23 outer wall are all sprayed with wear-resistant insulating paint, several lower mounting holes 24 are opened on the outer wall of the lower part of lower half stator 2, upper parting surface 11 and lower parting surface 21 completely coincide, the two ends of upper parting surface 11 and lower parting surface 21 are located at the center position of stator slot, two upper stator slots 12 at upper parting surface 11 and two lower stator slots 22 at lower parting surface 21 form two complete stator slots, two upper positioning pins 3 are welded on the outer wall of upper parting surface 11 along diagonal direction, two upper positioning holes 4 are opened on the outer wall of upper parting surface 11 along diagonal direction, two lower positioning pins 5 are welded on the outer wall of lower parting surface 21 along diagonal direction, two lower positioning holes 6 are opened on the outer wall of lower parting surface 21 along diagonal direction, two upper positioning pins 3 are respectively inserted into two lower positioning holes 6, two lower positioning pins 5 are respectively inserted into two upper positioning holes 4, upper half stator 1 and lower half stator 2 are fixed by a plurality of bolts, the stator core is provided with a plurality of circumferentially distributed concentrated windings 8, the end of concentrated winding 8 is fixed by a tie, a plurality of upper stator slots 12 and a plurality of lower stator slots 22 inner wall are all inserted with "U" type structure insulating paper 7, the inner wall of both sides of concentrated winding 8 respectively abuts on the inner wall of two insulating papers 7.
[0024] Embodiment 2, refer to Figure 5 A kind of half motor stator structure using concentrated winding, also includes two groups of heat dissipation pipes 9 arranged on upper half stator 1 and lower half stator 2, heat dissipation pipe 9 includes a plurality of heat exchange pipes and a plurality of semicircular structure connecting pipes, a plurality of heat exchange pipes are respectively inserted into a plurality of upper mounting holes 14 and a plurality of lower mounting holes 24, a plurality of connecting pipes are respectively welded on the outer wall of one end of a plurality of heat exchange pipes.
[0025] By setting the parting surface accurately at the center of each stator slot, after the upper half stator 1 and the lower half stator 2 are combined, each slot is complete without any empty slot, and the winding distribution under all poles is completely symmetrical, thus eliminating the magnetic field imbalance problem caused by the magnetic circuit asymmetry from the source. Since all stator slots are fully utilized, the effective magnetic area of the core is maximized, and under the same volume and material usage, the motor can generate a stronger magnetic field and greater electromagnetic torque, significantly improving the power and torque density of the motor. Concentrated winding is essentially fractional slot winding, which can effectively weaken the tooth harmonic content of the magnetic field, thereby significantly reducing the cogging torque and torque ripple, making the motor more stable and quiet during startup and low-speed operation, improving the control performance, and being particularly suitable for marine environments with strict requirements on vibration and noise.
[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0027] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0028] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical solutions and inventive concepts of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.
Claims
1. A half-split motor stator structure using a concentrated winding, comprising a complete stator core composed of an upper half stator (1) and a lower half stator (2), characterized in that, The bottom plane of the upper half stator (1) is an upper parting surface (11), the inner wall of the upper half stator (1) is provided with a plurality of circumferentially distributed upper stator slots (12), and the plurality of upper stator slots (12) separate the inner wall of the upper half stator (1) into a plurality of upper stator teeth (13); The top plane of the lower half stator (2) is a lower parting surface (21), the inner wall of the lower half stator (2) is provided with a plurality of circumferentially distributed lower stator slots (22), and the plurality of lower stator slots (22) separate the inner wall of the lower half stator (2) into a plurality of lower stator teeth (23); The upper parting surface (11) and the lower parting surface (21) completely coincide, and the two ends of the upper parting surface (11) and the lower parting surface (21) are located at the center position of the stator slot, the two upper stator slots (12) at the upper parting surface (11) and the two lower stator slots (22) at the lower parting surface (21) form two complete stator slots; The stator core is provided with a plurality of circumferentially distributed concentrated windings (8); The upper half stator (1) and the lower half stator (2) are both provided with heat dissipation pipes (9).
2. A fractional-slot concentrated-winding motor stator structure according to claim 1, characterized in that, The upper half stator (1) is formed by stacking a plurality of silicon steel sheets, the upper parting surface (11) is a precisely processed smooth plane, the magnetic resistance is reduced, the magnetic circuit is kept continuous, the inner walls of the plurality of upper half stator slots (12) and the outer walls of the plurality of upper stator teeth (13) are both sprayed with wear-resistant insulating paint, and the upper half stator (1) is provided with a plurality of upper mounting holes (14) on the outer wall of the upper portion.
3. A fractional-slot concentrated-winding motor stator structure according to claim 1, characterized by The lower half stator (2) is formed by stacking a plurality of silicon steel sheets, the lower parting surface (21) is a precisely processed smooth plane, the inner walls of the plurality of lower half stator slots (22) and the outer walls of the plurality of lower stator teeth (23) are both sprayed with wear-resistant insulating paint, and the lower half stator (2) is provided with a plurality of lower mounting holes (24) on the outer wall of the lower portion.
4. A fractional-slot concentrated-winding motor stator structure according to claim 1, characterized by Two upper positioning pins (3) are welded on the outer wall of the upper parting surface (11) along the diagonal direction, and two upper positioning holes (4) are formed on the outer wall of the upper parting surface (11) along the diagonal direction.
5. A fractional-slot stator structure for a concentrated-winding electric machine according to claim 4, wherein Two lower positioning pins (5) are welded on the outer wall of the lower parting surface (21) along the diagonal direction, and two lower positioning holes (6) are formed on the outer wall of the lower parting surface (21) along the diagonal direction, the two upper positioning pins (3) are respectively inserted into the two lower positioning holes (6), and the two lower positioning pins (5) are respectively inserted into the two upper positioning holes (4), and the upper half stator (1) and the lower half stator (2) are fixed by a plurality of bolts.
6. A fractional-slot concentrated-winding motor stator structure according to claim 1, characterized by The inner walls of the plurality of upper stator slots (12) and the plurality of lower stator slots (22) are both inserted with "U"-shaped insulating paper (7), and the inner walls of the two sides of the concentrated winding (8) respectively abut against the inner walls of the two insulating papers (7).
7. A fractional-slot stator structure for a concentrated-winding electric machine according to claim 3, wherein The heat dissipation pipe (9) comprises a plurality of heat exchange pipes and a plurality of semi-circular connecting pipes, the plurality of heat exchange pipes are respectively inserted into the plurality of upper mounting holes (14) and the plurality of lower mounting holes (24), and the plurality of connecting pipes are respectively welded on the outer walls of one ends of the plurality of heat exchange pipes.