Rotor structure of permanent magnet motor

Abstract

The utility model discloses a permanent magnet motor rotor structure, which comprises a rotating shaft, a rotor iron core, a permanent magnet and a magnetic pole pressing plate, the rotor iron core is sleeved on the rotating shaft and comprises a placing groove, the magnetic pole pressing plate is arranged at the end part of the rotor iron core, the magnetic pole pressing plate comprises a through groove arranged corresponding to the placing groove, and the permanent magnet is arranged in the through groove. The permanent magnet penetrates through the penetrating groove and then is embedded into the placing groove, and the magnetic pole pressing plate further comprises a blocking edge which is located beside the penetrating groove and is bent into the penetrating groove to block the permanent magnet after the permanent magnet penetrates through the blocking edge. The permanent magnets are fixed after the flanges of the magnetic pole pressing plates are bent, the effect of fixing the permanent magnets can be achieved without baffle plates, screws and gasket components, the manufacturing cost is reduced, and the assembling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet motors, in particular to a permanent magnet motor rotor structure. Background Art

[0002] Permanent magnet motors (PMMs) are increasingly used in many fields due to their simple structure, compact size, high efficiency, and excellent power performance. However, the presence of permanent magnets necessitates significant differences in the machining, assembly, and tooling of their rotor structures. To improve the performance, stability, and consistency of PMMs, as well as enhance production efficiency, manufacturers are continuously striving to refine and perfect these techniques.

[0003] The rotor structure of a typical permanent magnet motor typically consists of a rotating shaft, a rotor core, and permanent magnets. The permanent magnets are assembled within the rotor core and secured using laminated plates and baffles, secured with washers and screws. However, this fixing method is inefficient and disadvantageous in terms of manufacturing costs. Utility Model Content

[0004] The purpose of the utility model is to provide a permanent magnet motor rotor structure.

[0005] To achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical solution: a permanent magnet motor rotor structure, which includes a rotating shaft, a rotor core, a permanent magnet and a magnetic pole pressure plate, the rotor core is sleeved on the rotating shaft, the rotor core includes a placement slot, the magnetic pole pressure plate is arranged at the end of the rotor core, the magnetic pole pressure plate includes a through slot corresponding to the placement slot, the permanent magnet passes through the through slot and is embedded in the placement slot, the magnetic pole pressure plate also includes a guard located next to the through slot and bent into the through slot after the permanent magnet passes through to resist the permanent magnet.

[0006] As a further improved technical solution of the present invention, the magnetic pole pressure plate further includes a cut groove connected to the through groove, and the retaining edge is suspended between the through groove and the cut groove.

[0007] As a further improved technical solution of the present invention, the through groove is rectangular and includes a long side wall and a short side wall. The cutting groove is formed by a recessed arrangement in one of the long side walls. The cutting groove includes a first end wall and a second end wall. The retaining edge extends integrally from the first end wall to the second end wall and is spaced apart from the second end wall.

[0008] As a further improved technical solution of the present invention, the width range of the rib is 4mm-10mm, the length range is 50mm-90mm, and the rib is bent into the groove with a bending angle of 10°-20°.

[0009] As a further improved technical solution of the present invention, the free end of the rib is arc-shaped with a radius ranging from 2mm to 5mm; the first end wall is rounded next to the rib with a radius ranging from 3mm to 8mm.

[0010] As a further improved technical solution of the present invention, the magnetic pole pressure plate includes a circular ring plate body, a plurality of through grooves distributed circumferentially on the plate body, and an axial hole located in the circular ring.

[0011] As a further improved technical solution of the present invention, the plurality of through grooves are symmetrically distributed in a V-shape in groups of two, and the angle between the two through grooves in each group is in the range of 130°-140°.

[0012] As a further improved technical solution of the present invention, the magnetic pole pressure plate further includes a keyway located on the inner wall of the shaft hole, and the rotating shaft is provided with a convex key that matches the keyway.

[0013] As a further improved technical solution of the present invention, the magnetic pole pressure plate also includes a plurality of fixing holes distributed along the circumference on the plate body, and a fixing hole is provided between two adjacent through slots, and the magnetic pole pressure plate is locked to the rotor core through the fixing holes.

[0014] As a further improved technical solution of the present invention, the two magnetic pole pressure plates are respectively fixed to the two ends of the rotor core, and two internal fans spaced apart from the magnetic pole pressure plates are also fixed on the rotating shaft.

[0015] The beneficial effects of the utility model are as follows: the permanent magnet motor rotor structure adopts the rib of the magnetic pole pressure plate to directly fix the permanent magnet, and the rib of the magnetic pole pressure plate is bent and fixed to fix the permanent magnet, and the effect of fixing the permanent magnet can be achieved without using baffles, screws and gasket components, which reduces manufacturing costs and improves assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a permanent magnet motor rotor structure of the utility model;

[0017] Figure 2 This is a structural schematic diagram of a permanent magnet motor rotor structure in which the ribs of the magnetic pole baffle are not bent;

[0018] Figure 3 yes Figure 2 A partial enlarged schematic diagram;

[0019] Figure 4 This is a schematic structural diagram of a permanent magnet motor rotor structure of the present invention, wherein the rib of the magnetic pole baffle is bent;

[0020] Figure 5 yes Figure 4 Schematic diagram of the permanent magnet fixed by the middle rib. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the various embodiments shown in the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, it should be noted that these embodiments are not intended to limit the present invention, and any equivalent functional, methodological, or structural modifications or substitutions made by persons of ordinary skill in the art based on these embodiments fall within the scope of protection of the present invention.

[0022] Please refer to Figures 1 to 5 The present invention discloses a permanent magnet motor rotor structure 100, which includes a rotating shaft 1, a rotor core 2, a permanent magnet 3 and a magnetic pole pressure plate 4. The rotor core 2 is sleeved on the rotating shaft 1, and the rotor core 2 includes a placement slot 21. The magnetic pole pressure plate 4 is arranged at the end of the rotor core 2. The magnetic pole pressure plate 4 includes a through slot 41 corresponding to the placement slot 21. The permanent magnet 3 passes through the through slot 41 and is embedded in the placement slot 21. The magnetic pole pressure plate 4 also includes a rib 42 located next to the through slot 41 and bent into the through slot 41 after the permanent magnet 3 passes through to resist the permanent magnet 3. The permanent magnet motor rotor structure 100 uses the rib 42 of the pole pressure plate 4 to directly fix the permanent magnet 3. The pole pressure plate 4 has good ductility and the rib 42 is directly processed. After the permanent magnet 3 is inlaid, the rib 42 is bent into the groove 41, and the permanent magnet 3 is fixed by the rib 42. The effect of fixing the permanent magnet can be achieved without using baffles, screws and washers, which reduces manufacturing costs and improves assembly efficiency.

[0023] Please continue reading Figures 1 to 5 Specifically, the pole pressure plate 4 also includes a cut groove 43 connected to the through groove 41, and the rib 42 is suspended between the through groove 41 and the cut groove 43. The rib 42 only needs to be simply bent to make it located in the through groove 41, and the structure is stable, which can effectively fix the permanent magnet 3.

[0024] Furthermore, the through-slot 41 is rectangular and includes a long side wall 411 and a short side wall 412. The permanent magnet 3 is rectangular and can smoothly pass through the through-slot 41 to enter the placement slot 21 during assembly. The slot 43 is recessed from a long side wall 411. The slot 43 includes a first end wall 431 and a second end wall 432. The rib 42 extends integrally from the first end wall 431 to the second end wall 432 and is spaced apart from the second end wall 432. After the L-shaped slot 43 is machined into the long side wall 411, the long side wall 411 naturally forms a suspended rib 42, making it easy to bend. The width of the rib 42 ranges from 4mm to 10mm, and its length ranges from 50mm to 90mm. The rib 42 bends into the through-slot 41, and its bending angle α is 10° to 20°. The free end 421 of the rib 42 is arc-shaped, and its radius ranges from 2mm to 5mm. The first end wall 431 is rounded beside the rib 42, and its radius ranges from 3mm to 8mm.

[0025] Furthermore, the magnetic pole pressure plate 4 includes a circular plate body 44, a plurality of through slots 41 distributed circumferentially on the plate body 44, and an axial hole 45 located in the circular ring. The plurality of through slots 41 are symmetrically distributed in a V-shape in groups of two, and the angle β between the two through slots in each group is 130°-140°. The magnetic pole pressure plate 4 also includes a keyway 46 located on the inner wall of the axial hole 45, and a convex key that cooperates with the keyway 46 is provided on the rotating shaft 1. The magnetic pole pressure plate 4 also includes a plurality of fixing holes 47 distributed along the circumference of the plate body 44, and a fixing hole 47 is provided between two adjacent through slots 41. The magnetic pole pressure plate 4 is locked to the rotor core 2 through the fixing hole 47. The magnetic pole pressure plate 4 is integrally formed of a material with good ductility, with a simple process and a stable structure.

[0026] Furthermore, two magnetic pole pressure plates 4 are respectively fixed to the two ends of the rotor core 2, and two internal fans 5 are also fixed on the rotating shaft 1 and are respectively spaced apart from the magnetic pole pressure plates 4, which has a good heat dissipation effect.

[0027] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0028] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A permanent magnet motor rotor structure, characterized in that: It includes a rotating shaft, a rotor core, a permanent magnet and a magnetic pole pressure plate. The rotor core is sleeved on the rotating shaft. The rotor core includes a placement slot. The magnetic pole pressure plate is arranged at the end of the rotor core. The magnetic pole pressure plate includes a through slot corresponding to the placement slot. The permanent magnet passes through the through slot and is embedded in the placement slot. The magnetic pole pressure plate also includes a rib located next to the through slot and bent into the through slot after the permanent magnet passes through to resist the permanent magnet.

2. The permanent magnet motor rotor structure according to claim 1, characterized in that: The magnetic pole pressure plate further includes a cut groove connected to the through groove, and the rib is suspended between the through groove and the cut groove.

3. The permanent magnet motor rotor structure according to claim 2, characterized in that: The through groove is rectangular and includes a long side wall and a short side wall. The cutting groove is formed by a recessed arrangement in one of the long side walls. The cutting groove includes a first end wall and a second end wall. The retaining edge extends integrally from the first end wall to the second end wall and is spaced apart from the second end wall.

4. The permanent magnet motor rotor structure according to claim 3, characterized in that: The width of the rib is in the range of 4mm-10mm, and the length is in the range of 50mm-90mm. The rib is bent into the through groove, and the bending angle is 10°-20°.

5. The permanent magnet motor rotor structure according to claim 3, characterized in that: The free end of the rib is in an arc shape, and its radius ranges from 2mm to 5mm; the first end wall is arranged with a rounded corner next to the rib, and its rounded corner radius ranges from 3mm to 8mm.

6. The permanent magnet motor rotor structure according to claim 1, characterized in that: The magnetic pole pressure plate includes a circular ring plate body, a plurality of through slots circumferentially distributed on the plate body, and an axial hole located in the circular ring.

7. The permanent magnet motor rotor structure according to claim 6, characterized in that: The plurality of through grooves are arranged in a group of two and are symmetrically distributed in a V shape, and the included angle between the two through grooves in each group is in the range of 130°-140°.

8. The permanent magnet motor rotor structure according to claim 6, characterized in that: The magnetic pole pressure plate further comprises a keyway located on the inner wall of the shaft hole, and the rotating shaft is provided with a convex key matched with the keyway.

9. The permanent magnet motor rotor structure according to claim 6, characterized in that: The magnetic pole pressure plate further includes a plurality of fixing holes distributed along the circumference on the plate body, one fixing hole is provided between two adjacent through slots, and the magnetic pole pressure plate is locked to the rotor core through the fixing holes.

10. The permanent magnet motor rotor structure according to claim 1, characterized in that: The two magnetic pole pressure plates are respectively fixed to the two ends of the rotor core, and two inner fans are also fixed on the rotating shaft and are spaced apart from the magnetic pole pressure plates.

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