A cooling tower permanent magnet direct drive motor rotor lamination magnetic bridge structure

Abstract

The utility model relates to permanent magnet motor manufacturing technical field, concretely is a kind of permanent magnet direct drive motor rotor lamination magnetic bridge structure for cooling tower, solve the problem proposed in background art, it includes lamination body, multiple T type permanent magnets are axially arranged on the lamination body, the lamination body between adjacent two T type permanent magnets, form magnetic bridge;The magnetic bridge is asymmetric structure, the width of its near the lamination body center side is less than the width of its near the lamination body outer circle side. The utility model, by the magnetic bridge is designed as asymmetric structure of inside narrow, outside wide, forms magnetic bottleneck on the side near the rotor center, effectively increases the reluctance of leakage flux path, thereby significantly suppresses transverse leakage, improves air gap flux density and motor efficiency.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor manufacturing technology, specifically to a magnetic bridge structure for rotor laminations of a permanent magnet direct drive motor for cooling towers. Background Technology

[0002] Permanent magnet synchronous motors are widely used in industrial drives, wind power generation, and new energy vehicles due to their advantages such as high power density and high efficiency. To prevent the magnetic flux generated by the permanent magnet from forming a short circuit (i.e., leakage flux) between adjacent magnetic poles and to ensure that the rotor laminations have sufficient mechanical strength, a structure called a "magnetic bridge" is usually designed between two adjacent magnet slots.

[0003] Traditional magnetic bridges often employ a symmetrical design, meaning their two sides are of equal width or have a regularly symmetrical shape. This design often has limitations in balancing magnetic reluctance and mechanical strength. Increasing the width of the magnetic bridge to achieve higher strength leads to increased leakage flux, reducing motor efficiency and torque density; conversely, excessively reducing the width to minimize leakage flux may cause rotor tearing due to stress concentration at high speeds. Therefore, a novel magnetic bridge structure is urgently needed that can better balance electromagnetic performance and mechanical reliability. Utility Model Content

[0004] To solve the above problems, this utility model provides the following technical solution: a magnetic bridge structure for a rotor lamination of a permanent magnet direct drive motor for cooling towers, comprising a lamination body, wherein a plurality of T-shaped permanent magnets are axially arranged on the lamination body, and a magnetic bridge is formed on the lamination body between two adjacent T-shaped permanent magnets; the magnetic bridge is an asymmetrical structure, wherein the width of the side near the center of the lamination body is smaller than the width of the side near the outer circle of the lamination body.

[0005] Furthermore, the outline of the magnetic isolation bridge is formed by connecting straight line segments, and the whole is trapezoidal in shape.

[0006] Furthermore, the outline of the magnetic bridge is composed of smooth curves, giving it an overall streamlined shape.

[0007] Furthermore, the smooth curve is S-shaped.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] By designing the magnetic bridge as an asymmetrical structure with a narrow inner side and a wide outer side, a magnetic bottleneck is formed on the side near the rotor center, which effectively increases the magnetic resistance of the leakage flux path, thereby significantly suppressing lateral leakage flux and improving the air gap magnetic flux density and motor efficiency. At the same time, a wider mechanical connection section is provided on the side near the outer circle of the rotor, which enhances the structural strength of the magnetic bridge and ensures the mechanical reliability and stability of the rotor during high-speed operation. This cleverly and synergistically optimizes the electromagnetic and mechanical performance of the motor. Attached Figure Description

[0010] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] In the diagram: 1. Lamination body; 2. T-shaped permanent magnet; 3. Magnetic isolation bridge. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0014] like Figure 1 As shown, the permanent magnet direct drive motor rotor lamination magnetic bridge structure for cooling towers in this embodiment includes a lamination body 1, a plurality of T-shaped permanent magnets 2 axially arranged on the lamination body 1, and a magnetic bridge 3 formed on the lamination body 1 between two adjacent T-shaped permanent magnets 2; the magnetic bridge 3 is an asymmetrical structure, and its width on the side near the center of the lamination body 1 is smaller than its width on the side near the outer circle of the lamination body 1.

[0015] The outline of the magnetic bridge 3 is formed by connecting straight line segments, and the whole is trapezoidal in shape.

[0016] The outline of the magnetic bridge 3 is composed of smooth curves, and the whole is streamlined.

[0017] The smooth curve is S-shaped.

[0018] The working principle of this utility model is as follows:

[0019] The magnetic bridge 3 has an asymmetrical structure. In the embodiment shown in the attached figure, the width of the side of the bridge near the center of the lamination body 1 is significantly smaller than the width of the side near the outer circle of the lamination body 1, thus forming the aforementioned asymmetry on a macroscopic level.

[0020] In a preferred embodiment, the outline of the magnetic bridge 3 can be formed by connecting straight line segments. For example, it can be in the shape of a trapezoid (or a rounded trapezoid), with the shorter side of the trapezoid located near the center and the longer side located near the outer circle.

[0021] As another preferred embodiment, the outline of the magnetic bridge 3 can also be formed by a smooth curve, with an overall streamline shape. A particularly preferred streamline shape is an S-shaped curve, which smoothly transitions from a narrow inner side to a wide outer side.

[0022] The narrow section of the magnetic bridge 3 near the center forms a "magnetic bottleneck" on the magnetic flux leakage path, which significantly increases the magnetic resistance of the path. This effectively suppresses the transverse magnetic leakage between permanent magnets, forcing more magnetic flux through the air gap to participate in electromechanical energy conversion, thereby improving the efficiency and torque density of the motor.

[0023] The wide section of the magnetic bridge 3 near the outer circle provides ample mechanical connection strength and a larger tear-resistant cross section for the rotor laminations, effectively withstanding the centrifugal force generated by the T-shaped permanent magnets during high-speed rotation, ensuring the reliability and safety of rotor operation.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetic bridge structure for a rotor lamination of a permanent magnet direct drive motor for a cooling tower, comprising a lamination body (1), wherein a plurality of T-shaped permanent magnets (2) are axially arranged on the lamination body (1), characterized in that, A magnetic bridge (3) is formed on the lamination body (1) between two adjacent T-shaped permanent magnets (2); the magnetic bridge (3) has an asymmetrical structure, and the width of the side of the lamination body (1) near the center is smaller than the width of the side of the lamination body (1) near the outer circle.

2. The magnetic bridge structure for the rotor laminations of a permanent magnet direct-drive motor for cooling towers according to claim 1, characterized in that: The outline of the magnetic isolation bridge (3) is formed by connecting straight line segments, and the whole is trapezoidal.

3. The magnetic bridge structure for the rotor laminations of a permanent magnet direct-drive motor for cooling towers according to claim 1, characterized in that: The outline of the magnetic bridge (3) is composed of smooth curves, and the whole is streamlined.

4. The magnetic bridge structure for the rotor laminations of a permanent magnet direct-drive motor for cooling towers according to claim 3, characterized in that: The smooth curve is S-shaped.

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