Permanent magnet synchronous motor structure with weight-reduced rotor

Abstract

The invention, which relates to the technical field of the permanent-magnet synchronous motor, discloses a rotor weight-reduced permanent-magnet synchronous motor structure comprising a permanent-magnet synchronous motor rotor which is formed by assembling magnetic steel, a rotor punching sheet, a rotor iron core, a shaft body and a shaft key. The weight of the magnetic steel is reduced by adopting a surface-mounted structure during electromagnetic design, the total weight of the rotor punching sheet is further reduced by adopting a radial plate structure, the radial plate structure mainly plays roles in supporting a rotor iron core and transmitting torque in the rotor, the connection strength is ensured by adopting a titanium alloy material, and the connection strength is improved under the condition that the strength is ensured. The middle part of the radial plate structure is processed to realize further weight reduction, and the structural strength of the radial plate structure is verified through software simulation. According to the invention, the overall structural strength of the rotor is increased under the condition that the weight of the rotor is effectively reduced, so that the reliability of the permanent magnet synchronous motor during operation is ensured.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet synchronous motor technology, and in particular to a permanent magnet synchronous motor structure with reduced rotor weight. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs) are small in size, light in weight, highly efficient, and have a high power density, making them widely used in various fields. Their performance indicators have also attracted considerable attention. Currently, PMSMs are frequently used in underwater navigation equipment to provide propulsion. In such applications, lightweight design is a crucial requirement for PMSMs.

[0003] Underwater navigation equipment is mostly used in the sea. The overall system structure is complex and includes many subsystems. Therefore, the overall weight inevitably increases. Excessive weight can lead to problems such as reduced overall safety, increased control difficulty, and increased total cost. Therefore, weight reduction design has become an essential part of the design of each subsystem.

[0004] A permanent magnet synchronous motor (PMSM) is mainly composed of a stator, rotor, frame, and end covers, and its weight is primarily determined by these components. The rotor's overall structure offers significant potential for weight reduction, while the other components have limited space for weight reduction due to their fixed basic dimensions during electromagnetic design, considering electromagnetic performance and overall structural strength. Therefore, weight reduction design is primarily focused on the rotor. Simultaneously, the PMSM needs to output torque during operation; therefore, while considering effective rotor weight reduction, the overall structural strength of the rotor must also be considered to ensure the reliability of the PMSM during operation. How to achieve weight reduction while ensuring the overall safety of the PMSM is also a problem that needs to be addressed in the design. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a permanent magnet synchronous motor structure with reduced rotor weight, effectively solving the problems raised in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A permanent magnet synchronous motor structure with rotor weight reduction includes a permanent magnet synchronous motor rotor, which is assembled from magnets, rotor laminations, rotor core, shaft and shaft key. The magnets adopt a surface-mount structure in electromagnetic design to reduce weight, and the rotor laminations adopt a spoke structure to further reduce the overall weight.

[0007] As a preferred technical solution of the present invention, the spoke structure mainly plays the role of supporting the rotor core and transmitting torque in the rotor. It uses titanium alloy material to ensure the strength of the connection. Under the condition of ensuring strength, the middle part of the spoke structure is processed away to further reduce weight. The structural strength of the spoke structure is verified by software simulation.

[0008] As a preferred technical solution of the present invention, the main function of the shaft key is to ensure a reliable connection between the spoke structure and the rotor core. It is made of titanium alloy to ensure the strength of the connection, and to prevent the rotor core from separating from the spoke structure and causing relative displacement during operation of the permanent magnet synchronous motor, thus ensuring the safety of the permanent magnet synchronous motor operation.

[0009] As a preferred technical solution of the present invention, the shaft body is made of high-strength titanium alloy material and designed as a hollow structure, which greatly reduces the weight of the shaft body while ensuring strength. The spoke structure is welded to the shaft body to reduce the number of parts and achieve weight reduction. The overall structural strength is verified by software simulation.

[0010] The beneficial effects of this invention are as follows: In the specific design of this invention, firstly, the magnets adopt a surface-mount structure in the electromagnetic design to reduce weight, and the rotor laminations adopt a spoke structure to further reduce the overall weight. The spoke structure is made of titanium alloy to ensure the strength of the connection. While ensuring strength, the middle part of the spoke structure is machined away to achieve further weight reduction. Secondly, the shaft key is made of titanium alloy to ensure the strength of the connection and to prevent the rotor core from separating from the spoke structure and causing relative displacement during operation, thus ensuring the safety of the permanent magnet synchronous motor. Finally, the shaft is made of high-strength titanium alloy and designed as a hollow structure, which greatly reduces the weight of the shaft while ensuring strength. The spoke structure is welded to the shaft to reduce the number of parts and achieve weight reduction. In this way, the overall structural strength of the rotor is increased while ensuring effective weight reduction, which in turn facilitates the reliability of the permanent magnet synchronous motor during operation. Attached Figure Description

[0011] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0012] Figure 1 This is a schematic diagram of the rotor structure of the permanent magnet synchronous motor of the present invention; Figure 2 This is a cross-sectional structural diagram of the shaft and spoke structure of the present invention; Figure 3 This is a schematic diagram of the rotor lamination structure of the present invention; Figure 4 This is a schematic cross-sectional view of the magnet of the present invention.

[0013] In the diagram: 1. Magnet; 2. Rotor lamination; 3. Shaft; 4. Shaft key; 5. Spoke structure; 6. Rotor core. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0015] Reference Figure 1-4 This embodiment discloses a permanent magnet synchronous motor structure with rotor weight reduction, including a permanent magnet synchronous motor rotor. The permanent magnet synchronous motor rotor is assembled from magnets 1, rotor laminations 2, rotor core 6, shaft 3 and shaft key 4. The magnets 1 adopt a surface-mount structure in electromagnetic design to reduce weight, and the rotor laminations 2 adopt a spoke structure 5 to further reduce the total weight. As a preferred technical solution in this embodiment, the spoke structure 5 mainly plays the role of supporting the rotor core 6 and transmitting torque in the rotor. It uses titanium alloy material to ensure the strength of the connection. Under the condition of ensuring the strength, the middle part of the spoke structure 5 is processed away to further reduce the weight. The structural strength of the spoke structure 5 is verified by software simulation. As a preferred technical solution in this embodiment, the main function of the shaft key 4 is to ensure a reliable connection between the spoke structure 5 and the rotor core 6. It is made of titanium alloy to ensure the strength of the connection, and to prevent the rotor core 6 from separating from the spoke structure 5 and causing relative displacement during the operation of the permanent magnet synchronous motor, thus ensuring the safety of the permanent magnet synchronous motor operation. As a preferred technical solution in this embodiment, the shaft 3 is a component that outputs torque from the motor. It is made of high-strength titanium alloy and designed as a hollow structure, which greatly reduces the weight of the shaft 3 while ensuring strength. The spoke structure 5 is welded to the shaft 3 to reduce the number of parts and achieve weight reduction. The overall structural strength is verified by software simulation.

[0016] In the specific design of this invention: First, the magnet 1 adopts a surface-mount structure in the electromagnetic design to reduce weight. The rotor lamination 2 adopts a spoke structure 5 to further reduce the overall weight. The spoke structure 5 is made of titanium alloy to ensure the strength of the connection. With the strength guaranteed, the middle part of the spoke structure 5 is machined away to achieve further weight reduction. Second, the shaft key 4 is made of titanium alloy to ensure the strength of the connection and prevent the rotor core 6 from detaching from the spoke structure 5 during operation, thus avoiding relative displacement and ensuring the safety of the permanent magnet synchronous motor operation. Finally, the shaft 3 is made of high-strength titanium alloy and designed as a hollow structure, which greatly reduces the weight of the shaft 3 while ensuring strength. The spoke structure 5 is welded to the shaft 3 to reduce the number of parts and achieve weight reduction. In this way, the overall structural strength of the rotor is increased while ensuring effective weight reduction, which in turn facilitates the reliability of the permanent magnet synchronous motor during operation.

[0017] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A permanent magnet synchronous motor structure with rotor weight reduction, comprising a permanent magnet synchronous motor rotor, characterized in that, The permanent magnet synchronous motor rotor is assembled from magnets (1), rotor laminations (2), rotor core (6), shaft (3) and shaft key (4). The magnets (1) adopt a surface-mount structure to reduce weight in electromagnetic design, and the rotor laminations (2) adopt a spoke structure (5) to further reduce the total weight.

2. The permanent magnet synchronous motor structure with rotor weight reduction according to claim 1, characterized in that, The spoke structure (5) mainly supports the rotor core (6) and transmits torque in the rotor. It uses titanium alloy material to ensure the strength of the connection. Under the condition of ensuring strength, the middle part of the spoke structure (5) is processed away to further reduce weight. The structural strength of the spoke structure (5) is verified by software simulation.

3. The permanent magnet synchronous motor structure with rotor weight reduction according to claim 1, characterized in that, The main function of the key (4) is to ensure a reliable connection between the spoke structure (5) and the rotor core (6). It is made of titanium alloy to ensure the strength of the connection and prevent the rotor core (6) from separating from the spoke structure (5) and causing relative displacement during operation of the permanent magnet synchronous motor, thus ensuring the safety of the permanent magnet synchronous motor operation.

4. The permanent magnet synchronous motor structure with rotor weight reduction according to claim 1, characterized in that, The shaft (3) is made of high-strength titanium alloy and designed as a hollow structure, which greatly reduces the weight of the shaft (3) while ensuring strength. The spoke structure (5) is welded to the shaft (3) to reduce the number of parts and achieve weight reduction. The overall structural strength is verified by software simulation.

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