Permanent magnet motor rotor pressing structure

Abstract

The application discloses a permanent magnet motor rotor pressing structure, which comprises a rotating shaft, a tooth-shaped pressing ring, a rotor iron core and a round nut. Short teeth for pressing the rotor iron core are arranged between adjacent large teeth of the tooth-shaped pressing ring. The tooth-shaped pressing rings are assembled on both sides of the rotor iron core on the rotating shaft, and the round nut is screwed into the rotating shaft to provide pressing force so that the tooth-shaped pressing ring on the left side is abutted against the shaft shoulder. The rotor iron core is effectively pressed, the rotor operation reliability is improved, the rotor iron core pressing area is increased, the maximum deformation of the tooth-shaped pressing ring is reduced under the same pressing force, and the rotor tooth expansion degree is controlled.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet motor technology, and relates to permanent magnet motor rotors, specifically a permanent magnet motor rotor clamping structure. Background Technology

[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Permanent magnet motors are highly efficient and have significant advantages in energy saving and consumption reduction. Compared with asynchronous motors of the same power, permanent magnet motors are smaller and lighter, which helps to save motor installation space on the vehicle body, and have higher power density.

[0003] The rotor of an electric motor is a rotating body supported by bearings and is the main rotating component in power machinery and working machinery. Existing permanent magnet motor rotor core clamping methods generally include riveting and threaded or keyed clamping with pressure rings at both ends. Riveting is mainly used in small and medium-sized motors due to its lower cost and simpler process; threaded or keyed clamping with pressure rings at both ends is mainly used in high-speed, high-temperature, and high-reliability medium and large-sized motors.

[0004] The rotor core clamping state determines the degree of rotor tooth expansion and affects the rotor's operational reliability. Therefore, developing a rotor core clamping structure for permanent magnet motors has become one of the key research areas for permanent magnet traction motors.

[0005] In existing technology, toothed clamping rings, rotor cores, and round nuts are sequentially installed on a rotating shaft. The rotor core is pressed between the toothed clamping rings at both ends by the clamping force of the round nuts. Because the clamping rings at both ends need to allow space for magnet installation, slots are cut in the magnet installation grooves, hence the toothed shape of the clamping rings. However, due to the toothed shape of the clamping rings and the slots between the teeth, there is a drawback that the rotor core cannot be effectively pressed down. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a rotor clamping structure for a permanent magnet motor.

[0007] This invention is achieved using the following technical solution:

[0008] A permanent magnet motor rotor clamping structure includes a rotating shaft, a toothed clamping ring, a rotor core, and a round nut; short teeth for clamping the rotor core are provided between adjacent large teeth on the toothed clamping ring; toothed clamping rings are assembled on both sides of the rotor core on the rotating shaft, and the round nut is screwed into the rotating shaft to provide clamping force so that the toothed clamping ring on the left side abuts against the shaft shoulder.

[0009] In use, the short teeth are set to fit the shape of the magnet groove to increase the clamping area and improve the clamping strength. The rotating shaft is fitted with a toothed pressure ring, a rotor core, a toothed pressure ring and a round nut from left to right. The rotating shaft has an external thread at the point where it contacts the round nut. The internal thread of the round nut matches the external thread of the rotating shaft. The rotor is clamped by tightening the round nut.

[0010] Preferably, the rotor core is keyed to the shaft, and the rotor core is connected to the shaft via the key and rotates synchronously with the shaft. For further effective clamping, a rotor pressure plate is fitted to the outer side of the toothed pressure ring, and the rotor pressure plates on both sides are locked together by bolts. The diameter of the shaft shoulder is larger than the inner diameter of the rotor pressure plate. Furthermore, to ensure uniform force on the toothed pressure ring and the rotor pressure plate, the bolts are evenly distributed along the circumference.

[0011] More preferably, the rotor core is formed by stacking rotor laminations. The rotor core is a centrally symmetrical body, with a central hole and 2n magnetic slots. The ends of the large and short teeth on the toothed pressure ring are pressed together by the rotor pressure plate.

[0012] More preferably, the toothed pressure ring has mounting holes on its large teeth for bolts to pass through.

[0013] More preferably, the large and short teeth are provided with stop edges for engaging with the inner edge of the rotor pressure plate.

[0014] More preferably, the position of the short teeth avoids the magnetic slots of the rotor core.

[0015] The permanent magnet motor rotor clamping structure of the present invention adopts a rotor core with a conformal pressure ring structure, which has the following advantages compared with the prior art:

[0016] 1. Ensure effective clamping of the rotor core to improve rotor operational reliability;

[0017] Second, a conformal pressure ring structure is adopted to increase the rotor core clamping area;

[0018] Third, under the same clamping force, reduce the maximum deformation of the toothed pressure ring and control the degree of rotor tooth expansion. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This indicates the existing rotor tooth profile pressure ring structure.

[0022] Figure 2 This indicates the existing rotor core clamping structure.

[0023] Figure 3 This indicates the rotor tooth profile pressure ring structure of the present invention.

[0024] Figure 4 This indicates the rotor core clamping structure of the present invention.

[0025] Figure 5 This indicates the rotor core structure.

[0026] Figure 6 This shows the elevation view of the rotor clamping structure.

[0027] Figure 7 This shows a side view of the rotor clamping structure.

[0028] In the diagram: 1-shaft, 101-shoulder, 2-toothed pressure ring, 201-large tooth, 202-short tooth, 203-stop edge, 204-mounting hole, 3-rotor core, 5-round nut, 6-key, 7-rotor pressure plate, 8-bolt. Detailed Implementation

[0029] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0030] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0032] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0033] like Figure 2 As shown, a permanent magnet motor rotor clamping structure includes a rotating shaft 1, a toothed clamping ring 2, a rotor core 3, and a round nut 5. Short teeth 202 (i.e., conformal short teeth added to the empty space of the magnet slots) are provided between adjacent large teeth 201 on the toothed clamping ring 2 to clamp the rotor core 3. The position of the short teeth 202 avoids the magnet slots of the rotor core 3. Toothed clamping rings 2 are mounted on both sides of the rotor core 3 on the rotating shaft 1. The round nut 5 is screwed into the rotating shaft 1 to provide clamping force, causing the toothed clamping ring 2 on the left side to abut against the shaft shoulder 101.

[0034] The rotor core 3 is assembled to the rotating shaft 1 via a key 6. The rotor core 3 is connected to the rotating shaft via the key and rotates synchronously with the rotating shaft. To further effectively tighten the shaft, the large teeth 201 and short teeth 202 are provided with stop edges 203 for engaging with the inner edge of the rotor pressure plate 7. The large teeth 201 of the toothed pressure ring 2 have mounting holes for bolts 8 to pass through. The rotor pressure plate 7 is assembled to the outer side of the toothed pressure ring 2, and the rotor pressure plates 7 on both sides are locked together by bolts 8. The diameter of the shaft shoulder is larger than the inner diameter of the rotor pressure plate. Furthermore, to ensure uniform force on the toothed pressure ring and the rotor pressure plate, the bolts 8 are evenly distributed along the circumference.

[0035] The rotor core 3 is formed by stacking rotor laminations. The rotor core 3 is a centrally symmetrical body, with a central hole and 2n magnet slots. The central axis of the central hole coincides with the central axis of the lamination body; all magnet slots are strip-shaped, and the strip-shaped slots are symmetrically arranged about the center line passing through the center of the rotor core 3; the 2n magnet slots are evenly spaced around the central axis of the lamination body; where n is an integer greater than or equal to 2. The ends of the large teeth 201 and short teeth 202 on the toothed pressure ring 2 are pressed together by the rotor pressure plate 7.

[0036] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. A permanent magnet motor rotor clamping structure, comprising a rotating shaft (1), a toothed clamping ring (2), a rotor core (3), and a round nut (5); characterized in that: The toothed pressure ring (2) has short teeth (202) between adjacent large teeth (201) for pressing the rotor core (3); the toothed pressure ring (2) is mounted on both sides of the rotor core (3) on the rotating shaft (1), and the round nut (5) is screwed into the rotating shaft (1) to provide a clamping force so that the toothed pressure ring (2) on the left side abuts against the shaft shoulder (101); The outer side of the toothed pressure ring (2) is fitted with a rotor pressure plate (7), and the rotor pressure plates (7) on both sides are locked together by bolts (8); The ends of the large teeth (201) and short teeth (202) on the toothed pressure ring (2) are pressed by the rotor pressure plate (7); The toothed pressure ring (2) has mounting holes (204) on its large teeth (201) for bolts (8) to pass through. The large tooth (201) and short tooth (202) are provided with stop edges (203) for engaging with the inner edge of the rotor pressure plate (7).

2. The permanent magnet motor rotor clamping structure according to claim 1, characterized in that: The rotor core (3) is assembled to the shaft (1) by a key (6).

3. The permanent magnet motor rotor clamping structure according to claim 2, characterized in that: The bolts (8) are evenly distributed along the circumference.

4. The permanent magnet motor rotor clamping structure according to claim 3, characterized in that: The rotor core (3) is formed by stacking rotor laminations.

5. The permanent magnet motor rotor clamping structure according to claim 1, characterized in that: The rotor core (3) is a centrally symmetrical body with a central hole and 2n magnetic slots, where n is an integer greater than or equal to 2.

6. The permanent magnet motor rotor clamping structure according to claim 1, characterized in that: The short tooth (202) is positioned to avoid the magnetic slot of the rotor core (3).

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