Motor stator of hollow wave winding
By designing hollow wave windings in the motor and passing them into coolant, the AC loss and heating problems caused by the uneven current inside the conductor at high speed are solved, and more efficient motor operation is achieved.
Patent Information
- Application Number
- CN202411431577.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-02-14
AI Technical Summary
At high speed, the current distribution inside the conductor of the flat wire motor is uneven, resulting in increased AC loss, severe heating of the motor and low efficiency.
A motor stator with hollow wave winding is designed, using a continuous wave winding of copper flat wire, and cooling liquid is introduced into the winding to reduce the unevenness of the current inside the conductor.
Effectively suppress AC loss, reduce winding temperature, improve motor efficiency, and improve power density and reliability.
Smart Images
Figure CN119448628A_ABST
Abstract
Description
Technical Field
[0001] The invention patent relates to the field of motor technology, and specifically to a motor stator with a hollow wave winding. Background Art
[0002] Flat wire motors use flat wires (called flat wires) to replace traditional round wires for winding. This flat design allows for tighter winding arrangements, increasing the slot fill rate and conductor filling factor of the motor. This helps to increase the power density and efficiency of the motor. The winding structure of the flat wire motor reduces friction and vibration between the wires, improving the reliability of the motor. Due to its higher efficiency, the flat wire motor generates less heat during operation than the round wire, reducing energy waste.
[0003] However, with the rapid development of new energy vehicle technology, flat wire motors are required to have high power density and high efficiency. For motor windings with higher speeds, the current distribution in the conductor is more uneven: the current is mainly concentrated in the thin layer on the surface of the conductor, and the current inside the conductor is small, which causes increased AC loss, severe motor heating, and low efficiency. Summary of the invention
[0004] The present invention provides a motor stator with a hollow wave winding. The present invention reduces the non-uniformity of the current inside the winding conductor, effectively suppresses the AC loss, and also reduces the winding temperature.
[0005] The technical solutions to the above problems are as follows: A motor stator with a hollow wave winding comprises a stator core, a phase conductive ring, a neutral point conductive ring, a phase lead-out terminal, and a continuous hollow wave winding and a winding end fixing boss; the hollow wave winding is sequentially embedded in the stator core, one end of the hollow wave winding is connected to the phase conductive ring, and the other end of the hollow wave winding is connected to the neutral point conductive ring, the phase line conductive ring and the neutral point conductive ring are respectively provided with the winding end fixing boss and the phase line lead-out terminal, and the winding end fixing boss is provided with a threaded hole for an external cooling system; the coolant flows into the hollow wave winding from the winding end fixing boss on the phase line conductive ring and flows out from the winding end fixing boss on the neutral point conductive ring.
[0006] Furthermore, the hollow wave winding uses copper flat wire and is continuously wave wound.
[0007] Furthermore, a hole is provided on the end face of the hollow wave winding, the hole is arranged along the axial direction of the winding and passes through the center, and the diameter of the hole is 0.05-2mm.
[0008] Furthermore, the pressure of the coolant is 1-10 MPa.
[0009] In the present invention, the motor winding is designed to be hollow, which reduces the non-uniformity of the current inside the winding conductor and can effectively suppress AC loss. At the same time, coolant is passed into the hollow wave winding for cooling, which further reduces the winding temperature and improves the motor efficiency. The hollow winding motor designed by the present invention uses less copper, has a lower temperature and a higher power density than conventional motors. In summary, the present invention reduces the AC loss caused by the skin effect of the winding, reduces the motor operating temperature, and improves the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a schematic diagram of the hollow wave winding used for the motor according to the present invention.
[0011] Figure 2 This is the assembly diagram of the hollow wave winding and stator.
[0012] Markings in the accompanying drawings: hollow wave winding 1, hole 1a, phase line lead-out terminal 2, phase line conductive ring 3, winding end fixing boss 4, neutral point conductive ring 5, stator core A. DETAILED DESCRIPTION
[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0014] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” and the like to indicate orientations or positional relationships, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0015] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0016] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0017] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0018] like Figure 1 to Figure 2 As shown, the motor stator of the hollow wave winding of the present invention includes multi-phase windings, usually three-phase, such as U phase, V phase, and W phase. Each phase winding includes multiple continuous hollow wave windings 1, one end of which is connected to the phase line conductive ring, and the other end is connected to the neutral point conductive ring.
[0019] The hollow wave winding motor stator, the hollow wave winding 1 uses copper flat wire, and is continuously wound, and the hollow wave winding 1 is sequentially embedded in the stator core A. Each hollow wave winding 1 is provided with a hole 1a, the diameter of the hole 1a is 0.05-2mm, and the hole 1a is arranged along the axial direction of the hollow wave winding 1 and passes through the axial end surface.
[0020] The phase conductive ring 3 and the neutral conductive ring 5 are both provided with a winding end fixing boss 4 and a phase lead-out terminal 2, the winding end fixing boss 4 is provided with a first hole, and one end of the hollow wave winding 1 is interference fit with the first hole on the phase conductive ring 3. Another fixing boss 4 is provided on the neutral conductive ring 5, and a second hole is provided on the fixing boss 4 on the neutral conductive ring 5, and the other end of the hollow wave winding 1 is interference fit with the second hole on the neutral conductive ring 5.
[0021] It also includes a cooling system, which consists of an oil pump, an oil tank and a cooler. The oil pump is connected to the oil tank, and the cooler is arranged on the oil tank. The cooler cools the cooling oil in the oil tank. The cooler can adopt a coil, etc., and a coolant for heat exchange is circulated in the coil.
[0022] The connecting components (oil supply pipeline) in the cooling system can be matched with the winding end fixing boss 4 by threaded fit or interference fit. For example, a threaded hole is set on the winding end fixing boss 4, and the threaded hole is used for an external cooling system. Through the action of the winding end fixing boss 4, the connecting components in the cooling system can obtain a solid support effect to avoid shaking due to vibration and other factors during use.
[0023] The two end faces of the hollow wave winding 1 are provided with threads, and the end faces of the hollow wave winding 1 are connected to the cooling system through threads. For example, the hollow wave winding 1 is provided with external threads, and the connecting parts (oil supply pipelines) in the cooling system are provided with internal threads.
[0024] The coolant is preferably cooling oil, and the flow direction of the cooling oil is the same as the current direction on the hollow wave winding 1, that is, the cooling oil output from the cooling system flows into the hole 1a of the hollow wave winding 1 through the phase line conductive ring 3, flows along the hole 1a, flows into the neutral point conductive ring 5, and then returns to the cooling system from the neutral point conductive ring 5.
[0025] The pressure of the coolant provided in the cooling system is 1-10MPa. The cooling system is connected to each phase winding through a flow distributor. The number of oil supply pipelines is the same as the number of windings, and the cooling oil flow rate matches the heat generated by the motor.
[0026] The above embodiments are part of the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be simply understood as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.
Claims
1. A motor stator with a hollow wave winding, comprising a stator core (A), a phase line conductive ring (3), a neutral point conductive ring (5), and a phase line lead terminal (2), characterized in that: It also includes a continuous hollow wave winding (1) and a winding end fixing boss (4); the hollow wave winding (1) is sequentially embedded in the stator core (A); one end of the hollow wave winding (1) is connected to the phase line conductive ring (3); the other end of the hollow wave winding (1) is connected to the neutral point conductive ring (5); the phase line conductive ring (3) and the neutral point conductive ring (5) are respectively provided with the winding end fixing boss (4) and the phase line lead-out terminal (2); the winding end fixing boss (4) is provided with a threaded hole for an external cooling system; the cooling liquid flows into the hollow wave winding (1) from the winding end fixing boss (4) on the phase line conductive ring and flows out from the winding end fixing boss (4) on the neutral point conductive ring (5).
2. The motor stator with hollow wave winding according to claim 1, characterized in that: The hollow wave winding (1) uses copper flat wire and is continuously wave wound.
3. The motor stator with hollow wave winding according to claim 1, characterized in that: A hole (1a) is provided on the end surface of the hollow wave winding (1), the hole is arranged along the axial direction of the winding and passes through the center, and the diameter of the hole (1a) is 0.05-2 mm.
4. The motor stator with hollow wave winding according to claim 1, characterized in that: The pressure of the coolant is 1-10 MPa.