Magnet yoke and shaft structure for small and medium-sized synchronous motor

Abstract

The utility model relates to the technical field of synchronous motors, in particular to a magnet yoke and shaft structure for small and medium-sized synchronous motors, which comprises a cast steel magnet yoke, a forged steel shaft body and a magnetic pole punching sheet, the center of the cast steel magnet yoke is provided with a mounting hole, the cast steel magnet yoke is thermally sleeved on the forged steel shaft body, and the magnetic pole punching sheet is mounted on the cast steel magnet yoke. The method has the advantages that the material cost is reduced, and the processing difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of synchronous motors, in particular to a magnetic yoke and shaft structure for small and medium-sized synchronous motors. BACKGROUND

[0002] Small and medium-sized synchronous motors have small stator outer diameters and small radial dimensions of rotor magnetic poles and shafts, in order to ensure structural strength, the current shafts and magnetic yokes are mostly formed in an integrated structure.

[0003] However, it is found in actual production that the integrated structure of the magnetic yoke and the shaft is formed by one-piece forging, and the steel material used for one-time forging has a large size, which also leads to a large amount of wasted material, and the processing difficulty is large, and a large amount of labor cost is wasted. CONTENT OF THE UTILITY MODEL

[0004] In order to reduce the material cost and reduce the processing difficulty, the present application provides a magnetic yoke and shaft structure for small and medium-sized synchronous motors.

[0005] The magnetic yoke and shaft structure for small and medium-sized synchronous motors provided by the present application adopts the following technical scheme:

[0006] A magnetic yoke and shaft structure for small and medium-sized synchronous motors, comprising a cast steel magnetic yoke, a forged steel shaft body and a magnetic pole punching sheet, the center of the cast steel magnetic yoke is provided with a mounting hole, the cast steel magnetic yoke is hot-mounted on the forged steel shaft body, and the magnetic pole punching sheet is mounted on the cast steel magnetic yoke.

[0007] In one of the embodiments, the forged steel shaft body is in interference fit with the mounting hole.

[0008] In one of the embodiments, a plurality of T-tail grooves are arranged on the cast steel magnetic yoke, a T-tail is arranged on the magnetic pole punching sheet and arranged in the T-tail groove, a magnetic pole key is arranged in the T-tail groove and used for pressing the magnetic pole punching sheet against the outer wall of the cast steel magnetic yoke, the depth of the T-tail groove is greater than the length of the T-tail, the T-tail is welded to the bottom surface of the T-tail groove, and the minimum distance between the bottom of the T-tail groove and the inner wall of the mounting hole is greater than or equal to one fourth of the minimum distance between the inner wall of the mounting hole and the outer wall of the cast steel magnetic yoke.

[0009] In one of the embodiments, the end of the T-tail is provided with a plurality of welding grooves.

[0010] In one of the embodiments, the magnetic pole key comprises a main key and a secondary key, the main key and the secondary key are arranged in a wedge-shaped structure, and the wedge-shaped surfaces of the main key and the secondary key are arranged in a right-angled quadrilateral after abutting.

[0011] In one of the embodiments, the elastic deformation part is provided on the wedge surface of the main key or the auxiliary key, the width of the elastic deformation part is not greater than the width of the main key, the elastic deformation part is in linear contact initially, and the elastic deformation part is in surface contact after the magnetic pole key is installed.

[0012] In one of the embodiments, one side of the elastic deformation part is integrally connected to one side edge of the main key, and the other side is bent to the other side of the main key.

[0013] In one of the embodiments, the elastic deformation part comprises a bending part and a connecting part, and the connecting part is inserted into the edge of the main key.

[0014] In one of the embodiments, the cross section of the connecting part is L-shaped, and the edge of the main key is provided with an L-shaped opening slot.

[0015] In one of the embodiments, the other end of the elastic deformation part is abutted against the end surface of the main key.

[0016] In summary, the application has the following beneficial effects:

[0017] 1. The split structure is adopted between the cast steel magnetic yoke and the forged steel shaft body, on the one hand, the shaft is made of forged steel instead of cast steel, thereby reducing the cost, on the other hand, the split design makes the processing simple and convenient, and reduces material waste;

[0018] 2. Through the design of the elastic deformation part, the auxiliary key can be installed in place first, and then the main key is installed, and when the main key is installed, the friction between the main key and the auxiliary key is small because the elastic deformation part is abutted therebetween, so that the auxiliary key is not easily pushed out when the main key moves axially, thereby facilitating the installation of the magnetic pole key. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of embodiment one;

[0020] Figure 2 is a partial structural schematic diagram of embodiment one;

[0021] Figure 3 is a structural schematic diagram of the magnetic pole key in embodiment one;

[0022] Figure 4 is a sectional structure of the main key in embodiment two Figure 1 , which shows the initial state of the elastic deformation part;

[0023] Figure 5 is a sectional structure of the main key in embodiment two Figure 2 , which shows the state after the magnetic pole key is installed;

[0024] Figure 6is a sectional structure diagram of the main key in Example 3.

[0025] In the figure, 100, cast steel yoke; 110, T tail groove; 200, forged steel shaft body; 300, magnetic pole lamination; 310, T tail; 311, welding groove; 400, magnetic pole key; 410, main key; 411, elastic deformation part; 4111, bending part; 4112, connecting part; 412, insertion groove; 420, auxiliary key. DETAILED DESCRIPTION

[0026] The application will be further described in detail below with reference to the accompanying drawings.

[0027] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] Example 1: a magnetic yoke and shaft structure for small and medium-sized synchronous motors, as shown in Figure 1 The cast steel yoke 100 has a mounting hole in the center, the forged steel shaft body 200 is in interference fit with the mounting hole, and the cast steel yoke 100 is heat-fitted on the forged steel shaft body 200.

[0029] The magnetic pole lamination 300 is installed on the cast steel yoke 100. Specifically, the cast steel yoke 100 is provided with a plurality of T tail grooves 110, and the magnetic pole lamination 300 is provided with a T tail 310 installed in the T tail groove 110, and a magnetic pole key 400 is inserted in the T tail groove 110 for pressing the magnetic pole lamination 300 against the outer wall of the cast steel yoke 100.

[0030] Referring to Figure 2 , the depth of the T tail groove 110 is greater than the length of the T tail 310, so that when the T tail 310 is installed in the T tail groove 110, the T tail 310 and the bottom surface of the T tail groove 110 are arranged with a gap. The T tail 310 is provided with a plurality of welding grooves 311, and in this embodiment, the welding grooves 311 are provided with two, and through the arrangement of the welding grooves 311 and the gap, the T tail 310 and the bottom surface of the T tail groove 110 can be connected by welding.

[0031] In addition, in order to increase the radial dimension of the forged steel shaft body 200, the cast steel yoke 100 and the magnetic pole lamination 300, and to ensure the strength of the cast steel yoke 100, the minimum distance a between the bottom of the T tail groove 110 and the inner wall of the mounting hole is greater than or equal to one fourth of the minimum distance b between the inner wall of the mounting hole and the outer wall of the cast steel yoke 100.

[0032] As Figure 3As shown, the magnetic pole key 400 comprises a main key 410 and a secondary key 420, both of which are wedge-shaped, and the wedge surfaces of the main key 410 and the secondary key 420 are right-angled quadrilaterals.

[0033] Embodiment 2: as Figure 4 shown, different from embodiment 1 is that the wedge surface of the main key 410 or the secondary key 420 is provided with an elastic deformation part 411, and the elastic deformation part 411 is taken as an example provided on the main key 410 for description in this embodiment.

[0034] One side of the elastic deformation part 411 is integrally connected to one side edge of the main key 410, and the other side is curved to the other side of the main key 410. Referring to the attached Figure 4 , initially, the elastic deformation part 411 is in a curved structure, so it is in linear contact with the wedge surface of the secondary key 420. Referring to the attached Figure 5 , after the magnetic pole key 400 is installed, the elastic deformation part 411 is flattened or in a flattened state, at this time, the elastic deformation part 411 is in surface contact with the wedge surface of the secondary key 420.

[0035] In addition, it should be noted that in order to avoid the elastic deformation part 411 being hindered by the side wall of the T-tail groove 110 during the flattening process, it is required that the width of the elastic deformation part 411 is not greater than the width of the main key 410.

[0036] In addition, in order to increase the elasticity and structural strength of the elastic deformation part 411, the other end of the curved elastic deformation part 411 is preferably abutted to the end surface of the main key 410.

[0037] Embodiment 3: as Figure 6 shown, different from embodiment 2 is that the elastic deformation part 411 comprises a curved part 4111 and a connecting part 4112, and the connecting part 4112 is inserted into the edge of the main key 410.

[0038] Among them, the cross section of the connecting part 4112 is L-shaped, and the edge of the main key 410 is provided with an L-shaped opening slot 412.

[0039] The embodiments of the specific embodiments are the preferred embodiments of the present application, not limited to the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A magnetic yoke and shaft construction for small and medium sized synchronous motors, characterized in that: The application relates to a magnetic yoke, which comprises a cast steel magnetic yoke (100), a forged steel shaft body (200) and a magnetic pole punching sheet (300), the center of the cast steel magnetic yoke (100) is provided with a mounting hole, the cast steel magnetic yoke (100) is hot-mounted on the forged steel shaft body (200), and the magnetic pole punching sheet (300) is mounted on the cast steel magnetic yoke (100).

2. A magnetic yoke and shaft structure for small and medium-sized synchronous motors according to claim 1, characterized in that: The forged steel shaft body (200) is in interference fit with the mounting hole.

3. A magnetic yoke and shaft structure for small and medium-sized synchronous motors according to claim 1 or 2, characterized in that: The cast steel magnetic yoke (100) is provided with a plurality of T tail grooves (110), the magnetic pole punching sheet (300) is provided with T tails (310) mounted in the T tail grooves (110), the T tail grooves (110) are provided with magnetic pole keys (400) for pressing the magnetic pole punching sheet (300) against the outer wall of the cast steel magnetic yoke (100), the depth of the T tail groove (110) is greater than the length of the T tail (310), the T tail (310) is welded to the bottom surface of the T tail groove (110), and the minimum distance between the bottom of the T tail groove (110) and the inner wall of the mounting hole is greater than or equal to one fourth of the minimum distance between the inner wall of the mounting hole and the outer wall of the cast steel magnetic yoke (100).

4. A magnetic yoke and shaft construction for small and medium size synchronous motors according to claim 3, characterized in that: The end of the T tail (310) is provided with a plurality of welding grooves (311).

5. A magnetic yoke and shaft construction for small and medium size synchronous motors according to claim 3, characterized in that: The magnetic pole key (400) comprises a main key (410) and a secondary key (420), the main key (410) and the secondary key (420) are arranged in wedge-shaped structures, and the wedge surfaces of the main key (410) and the secondary key (420) are right-angled quadrilaterals in rear cross section.

6. A magnetic yoke and shaft construction for small and medium size synchronous motors according to claim 5, characterized in that: The wedge surface of the main key (410) or the secondary key (420) is provided with an elastic deformation part (411), the width of the elastic deformation part (411) is not greater than the width of the main key (410), the elastic deformation part (411) is in linear contact at the beginning, and the elastic deformation part (411) is in surface contact after the magnetic pole key (400) is installed.

7. A magnetic yoke and shaft construction for small and medium size synchronous motors according to claim 6, characterized in that: One side of the elastic deformation part (411) is integrally connected to one side edge of the main key (410), and the other side is bent towards the other side edge of the main key (410).

8. A magnetic yoke and shaft construction for small and medium size synchronous motors according to claim 6, characterized in that: The elastic deformation part (411) comprises a bending part (4111) and a connecting part (4112), and the connecting part (4112) is inserted into the edge of the main key (410).

9. A magnetic yoke and shaft construction for small and medium size synchronous motors according to claim 8, characterized in that: The cross section of the connecting part (4112) is L-shaped, and the edge of the main key (410) is provided with an L-shaped slot (412).

10. A magnetic yoke and shaft structure for small and medium-sized synchronous motors according to claim 7 or 8, characterized in that: The other end of the elastic deformation part (411) is abutted against the end surface of the main key (410).

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