Motor with shielding case

Abstract

The motor with the shielding cover comprises a hollow shell, a rotor and a stator sleeved on the periphery of the rotor are arranged in the shell along the same axial direction, the stator is provided with a plurality of stator grooves for accommodating windings along the circumferential direction, and the plurality of stator grooves are spaced apart from each other along the circumferential direction; the motor further comprises a shielding case, the shielding case is of an annular structure, the shielding case is arranged between the stator and the rotor, the shielding case, the stator and the rotor are arranged along the same axis, and the shielding case is radially limited by the inner surface of the stator. A plurality of raised lines which are arranged at intervals along the circumferential direction are arranged on the periphery of the shielding case along the circumferential direction, and each raised line extends along the axial direction of the shielding case and is at least partially accommodated in the corresponding stator slot along the radial direction; the shielding case is circumferentially limited in the stator slot by a plurality of raised lines; the two axial ends of the shielding cover are directly or indirectly abutted against the two ends of the shell, so that the shielding cover is axially limited. According to the structure, the shielding cover is limited, so that the shielding cover is prevented from moving during potting, and the potting performance is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely relates to a motor with shield case. BACKGROUND

[0002] In order to protect the internal components of motor from moisture, dust and other contaminants, improve the overall performance and reliability of motor, and protect it from the outside world, and in order to better heat conduction and heat dissipation of stator winding, the motor stator is usually potting treatment and fixed in the shell, the stator and rotor in the motor are provided with a shield case, the shield case not only provides necessary insulation protection in the electrical aspect, prevents potential electric corrosion problems, and also plays a stable role in mechanical structure, the shield case and the support ring, rotor and other components at the left and right ends of the motor form a hydraulic oil sealing cavity, the existing sealing cover structure is simple, without circumferential and axial positioning, and overflow, moving and other phenomena may occur during potting, which may cause the overall performance of the motor to decline and potential faults. SUMMARY

[0003] The utility model aims at at least one of the technical problems in the related art.

[0004] Therefore, one purpose of the utility model is to provide a motor with shield case, which comprises a shell, the shell is a hollow structure, a rotor and a stator sleeved on the outer periphery of the rotor are arranged in the shell along the same axial direction, the stator has an inner surface, a plurality of stator slots for accommodating windings are arranged on the stator along the circumferential direction, and the plurality of stator slots are spaced apart from each other along the circumferential direction, the motor further comprises a shield case, the shield case is in the form of a circular ring structure, the shield case is arranged between the stator and the rotor and arranged along the same axial line with the stator and the rotor, and the shield case is radially limited by the inner surface of the stator, a plurality of protrusions are arranged on the outer periphery of the shield case along the circumferential direction, the plurality of protrusions are arranged at intervals along the circumferential direction, each of the plurality of protrusions extends along the axial direction of the shield case and is at least partially accommodated in the corresponding stator slot along the radial direction, the shield case is circumferentially limited in the stator slot by the plurality of protrusions, and the two ends of the shield case along the axial direction directly or indirectly abut against the two ends of the shell to axially limit the shield case.

[0005] Optionally, a first end plate is arranged at a portion of the inner part of the shell near one end, and a second end plate is detachably arranged at the other end of the shell, the first end plate, the second end plate and the stator are arranged along the same axis, one end of the shielding cover is at least partially sleeved on the first end plate, and the other end of the shielding cover is at least partially sleeved on the second end plate. The axial position of the shielding cover is limited by the first end plate and the second end plate, so that the shielding cover is more firmly fixed and is prevented from moving along the axial direction.

[0006] Optionally, each of the plurality of convex strips comprises a first convex part and a second convex part, the first convex part and the second convex part are connected along the axial direction of the shielding cover; a cross section of the first convex part perpendicular to the axial direction of the shielding cover comprises an arc-shaped outer edge; two ends of the second convex part protrude symmetrically along the circumferential direction from a portion of two ends of the first convex part; the first convex part is at least partially accommodated in the corresponding stator slot; the first convex part and the second convex part have the same height along the radial direction and the highest end is close to the inner side of the stator slot, and the second convex part is in abutment with one end of the stator in the axial direction to limit the axial position. The first convex part is accommodated in the stator slot, and the shielding cover is prevented from rotating along the circumferential direction by the clamping of the stator slot, and the shielding cover is prevented from moving along the axial direction by the abutment of one end of the stator with the second convex part.

[0007] Optionally, the motor comprises a first support ring, the first support ring is sleeved on the first end plate, and the first support ring is arranged at one end of the shielding cover. The first support ring is used for limiting the left end of the shielding cover and preventing the shielding cover from moving to the left.

[0008] Optionally, the first support ring is provided with a circumferential first groove along the inner surface of the first support ring near one end of the shielding cover, and one end of the shielding cover is at least partially accommodated in the first groove. The left end of the shielding cover is accommodated in the first groove, and the shielding cover is prevented from moving to the left.

[0009] Optionally, the motor further comprises a second support ring, the second support ring is arranged at the other end of the shielding cover, and the second support ring, the first support ring and the shielding cover are arranged along the same axis. The second support ring is used for limiting the right end of the shielding cover and preventing the shielding cover from moving to the right.

[0010] Optionally, the second support ring is provided with a circumferential second groove along the inner surface of the second support ring near one end of the shielding cover, and the other end of the shielding cover is at least partially accommodated in the second groove. The right end of the shielding cover is accommodated in the second groove, and the shielding cover is prevented from moving to the right.

[0011] Optionally, the plurality of protrusions extend radially outward and are received in corresponding stator slots, the radial cross-section of the protrusions including an arcuate outer edge and the highest end of the protrusions being proximate the outer side of the stator slots.

[0012] Optionally, an edge of the shield proximate the second end plate is provided with a circumferential fold outward in the radial direction.

[0013] Optionally, the plurality of protrusions are provided axially in the middle portion of the shield, the positions of the protrusions being adapted to the stator so as to be received in corresponding stator slots.

[0014] The motor with the shield of the present application is fixed by radial, axial and circumferential structural features inside the motor, which can prevent the shield from being misaligned when the motor stator is filled, avoid the filling glue directly contacting the hydraulic oil, and at the same time, the shield 4 plays a role of isolating the distributed capacitance of the stator and the rotor, avoids the electric corrosion of the rotor bearing, and ensures the performance of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0015] Other features and advantages of the present application will be described below in conjunction with the drawings, which illustrate the present application in more detail based on embodiments.

[0016] Figure 1 is a structural schematic view of an external housing of a motor;

[0017] Figure 2 is an axial sectional structural schematic view of a motor housing

[0018] Figure 3 is a sectional structural schematic view of the motor along an axial line according to the first embodiment;

[0019] Figure 4 is Figure 3 is a local enlarged view of A in FIG.

[0020] Figure 5 is Figure 3 is a local enlarged view of B in FIG.

[0021] Figure 6 is a sectional structural schematic view of the motor along a radial direction according to the first embodiment;

[0022] Figure 7 is Figure 4 a partial enlarged view at C in

[0023] Figure 8 is a structural schematic view of the shield of Example One;

[0024] Figure 9 is a partial structural schematic view of the shield and stator of Example One;

[0025] Figure 10 is a structural schematic view of the first support ring of Example One;

[0026] Figure 11 is a structural schematic view of the second support ring of Example One;

[0027] Figure 12 is a structural schematic view of the motor along the axial direction of Example Two;

[0028] Figure 13 is Figure 11 a partial enlarged view at D in

[0029] Figure 14 is Figure 11 a partial enlarged view at E in

[0030] Figure 15 is a structural schematic view of the motor along the radial direction of Example Two;

[0031] Figure 16 is Figure 14 a partial enlarged view at F in

[0032] Figure 17 is a structural schematic view of the shield of Example Two.

[0033] Explanation of Reference Signs:

[0034] 1 - rotor, 2 - stator, 21 - stator slot, 3 - housing, 31 - left end plate, 311 - bearing seat, 312 - inner surface, 32 - right end plate, 321 - first step, 3211 - inner surface, 322 - second step, 4, 4' - shield, 41 - right protruding part, 42 - left protruding part, 41'- protruding strip, 421 - end face, 43, 43' - left end face, 44, 441'- right end face, 5 - left support ring, 51 - left groove, 6 - right support ring, 61 - right groove, 44', 62 - folded edge, 7 - winding. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for the purpose of illustration only and are not intended to limit the present application. In addition, the terms "first" and "second" are used only for the purpose of description and should not be construed as indicating or implying relative importance or implying the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] The application is a motor with a shield, the motor comprises a shell 3, the shell 3 is a hollow structure, a rotor 1 and a stator 2 sleeved on the outer periphery of the rotor 1 are arranged in the shell 3 along the same axis, the stator 2 has an inner surface, the stator 2 is provided with a plurality of stator slots 21 for accommodating windings 8 along the circumference, the plurality of stator slots 21 are spaced apart from each other along the circumference, the motor further comprises a shield, the shield is in a circular ring structure, the shield is arranged between the stator 2 and the rotor 1 and arranged along the same axis with the stator 2 and the rotor 1, and the shield is radially limited by the inner surface of the stator 2; the outer periphery of the shield is provided with a plurality of protrusions along the circumference, the plurality of protrusions are arranged at intervals along the circumference, each of the plurality of protrusions extends along the axial direction of the shield and is at least partially accommodated in the corresponding stator slot 21 along the radial direction; the shield is circumferentially limited in the stator slot 21 by the plurality of protrusions; the two ends of the shield along the axial direction directly or indirectly abut against the two ends of the shell 3, thereby axially limiting the shield.

[0037] In some embodiments, a portion of the inside of the shell 3 near one end is provided with a left end plate (as an example of "first end plate") 31, and the other end of the shell 3 is detachably provided with a right end plate (as an example of "second end plate") 32, the left end plate 31 and the right end plate 32 are arranged along the same axis with the stator 2, one end of the shield is at least partially sleeved on the left end plate 31, and the other end of the shield is at least partially sleeved on the right end plate 32.

[0038] The motor comprises a rotor 1 and a stator 2 sleeved on the outer periphery of the rotor 1 in the same axial direction, the stator 2 has an inner surface, the stator 2 is provided with a plurality of stator slots 21 for accommodating windings 7 in a circumferential array, and the plurality of stator slots 21 extend outward from the inner surface of the stator 1 in a radial direction to form a plurality of stator slots 21; the motor further comprises a shielding cover, the shielding cover is in a circular ring structure, the shielding cover is arranged between the stator 2 and the rotor 1 and arranged along the same axis as the stator 2 and the rotor 1, and the outer periphery of the shielding cover is provided with a plurality of protrusions in a circumferential array, each of the plurality of protrusions extends in the axial direction of the shielding cover and is at least partially accommodated in the corresponding stator slot 21 in the radial direction; the cross section of the protrusion perpendicular to the axial direction of the shielding cover comprises an arc-shaped outer edge; and the two ends of the shielding cover in the axial direction abut the two ends of the shell 3, respectively.

[0039] As shown in Figure 1 and Figure 2 , the motor of the present application comprises a shell 3, the shell 3 is in a hollow structure, the inside of the shell 3 and the part close to the left end are provided with a left end plate 31, the left end plate 31 extends to the right along its axis to form a bearing seat 311, the outer diameter of the bearing seat 311 is smaller than the outer diameter of the left end plate 31, the bearing seat 311 has a hollow structure to install the bearing of the rotor 1, and the left end plate 31 also has an inner surface 312; the right end of the shell 3 is provided with a right end plate 32, the right end plate 32 is detachably connected with the shell 3, the right end plate 32 extends to the left along its axis to form a continuous first step 321 and a second step 322 in sequence, the outer diameter of the first step 321 is smaller than the outer diameter of the right end plate 32, the outer diameter of the first step 321 is larger than the outer diameter of the second step 322, and the first step 321 has an inner surface 3211; a through hole is formed in the axial direction of the right end plate 32 to accommodate the rotating shaft of the rotor 1; the outer periphery of the rotor 1 is sleeved with a stator 2, the stator 2 is in a circular ring structure, the stator 2 has an inner surface and is provided with a plurality of stator slots 21 extending outward from the inner surface in a radial direction in a circumferential array, and the stator slots 21 are used to accommodate windings 7; a shielding cover is arranged between the stator 2 and the rotor 1, the shielding cover is in a circular ring structure, the stator 2, the rotor 1 and the shielding cover are arranged along the same axis to ensure the stability of the motor; the outer surface of the shielding cover is provided with a plurality of protrusions in a circumferential array, the plurality of protrusions extend in the axial direction of the shielding cover, each of the plurality of protrusions is at least partially accommodated in the corresponding stator slot 21, thus limiting the circumferential direction of the shielding cover and preventing the shielding cover from rotating in the circumferential direction.

[0040] Embodiment one

[0041] In some embodiments, each of the plurality of protrusions comprises a right protrusion (as an example of "first protrusion") 41 and a left protrusion (as an example of "second protrusion") 42, the right protrusion 41 and the left protrusion 42 are connected in the axial direction of the shield 4, the cross section of the right protrusion 41 perpendicular to the axial direction of the shield 4 comprises an arc-shaped outer edge, the two ends of the left protrusion 42 protrude a part of the two ends of the right protrusion 41 symmetrically in the circumferential direction; the right protrusion 41 is at least partially accommodated in the corresponding stator slot 21; the right protrusion 41 and the left protrusion 42 have the same height in the radial direction and the highest end is close to the inner side of the stator slot 21; the left protrusion 42 is in abutment with one end of the stator 2 in the axial direction to limit the axial direction.

[0042] As shown in Figure 8 , the two ends of the plurality of right protrusions 41 in the radial direction are close to but do not extend to the two ends of the shield 4, so the length of the right protrusion 41 in the radial direction is less than the length of the shield 4, and the left end of the plurality of right protrusions 41 is provided with a left protrusion 42 connected thereto, the left protrusion 42 has the same height in the radial direction as the right protrusion 41, and the two ends of the left protrusion 42 protrude the two ends of the right protrusion 41 in the radial direction, so that the left protrusion 42 has an end face 421, as shown in Figure 9 , the end face 421 is in abutment with the left end of the stator 2, and under the action of the stator 2, the shield 4 can be prevented from moving to the right; the shield 4 in the present application is made of a non-magnetic conductive material, including but not limited to plastic, aluminum alloy or stainless steel; the outer surface of the two ends of the shield 4 is provided with a chamfer; as shown in Figures 3 to 5 , a part of the left end of the shield 4 is sleeved on the outer periphery of the bearing seat 311, and a part of the right end of the shield 4 is sleeved on the outer periphery of the second step 322 of the right end plate 32; as shown in Figure 6 and Figure 7 , the plurality of right protrusions 41 of the shield 4 are accommodated in the plurality of stator slots 21, so that the circumferential direction of the shield 4 is limited, and the shield 4 is prevented from rotating in the circumferential direction.

[0043] In some embodiments, the motor comprises a left support ring (as an example of "first support ring") 5, the left support ring 5 is sleeved on the outer periphery of the bearing seat 311, and the left support ring 311 is arranged at one end of the shield 4.

[0044] In some embodiments, the left support ring 5 is provided with a circumferential left groove (as an example of "first groove") 51 on the inner surface of the one end of the shield 4, and the one end of the shield 4 is at least partially accommodated in the left groove 51 of the left support ring 5.

[0045] As shown in Figure 3 and Figure 4As shown, the motor of the present application further comprises a left support ring 5, which is annular in structure and used for limiting the left end of the stator; the left support ring 5 is sleeved on the outer periphery of the bearing seat 311, and the left end of the left support ring 5 abuts against the left end plate 31; as shown Figure 10 As shown, the right end of the left support ring 5 is provided with a circumferential left groove 51 along the inner surface thereof, and the right end of the left support ring does not protrude beyond the right end of the bearing seat 311 to the right, and the left end of the shield cover 4 is at least partially accommodated into the left groove 51, and the left groove 51 and the outer periphery of the bearing seat 311 jointly accommodate the portion of the shield cover 5 close to the left end, preventing the shield cover 4 from moving to the left in the axial direction.

[0046] In some embodiments, the motor further comprises a right support ring (as an example of "second support ring") 6 connected with the right end plate 32, which is arranged at the other end of the shield cover 4, and the right support ring 6, the left support ring 5 and the shield cover 4 are arranged along the same axis.

[0047] In some embodiments, the right end of the right support ring close to the shield cover 4 is provided with a circumferential right groove (as an example of "second groove") 61 along the inner surface thereof, and the other end of the shield cover 4 is at least partially accommodated into the right groove 61 of the right support ring 6.

[0048] As shown Figure 3 and Figure 5 As shown, the motor of the present application further comprises a right support ring 6, which is annular in structure and used for limiting the right end of the stator, and the right support ring 6 is sleeved on the outer periphery of the second step 322 of the right end plate 32; as shown Figure 11 As shown, the right end of the right support ring 6 is provided with a circumferential right groove 61 along the inner surface thereof, and the left end of the right support ring 6 does not protrude beyond the left end of the second step 322 to the left, and the right end of the shield cover 4 is at least partially accommodated into the right groove 61, and the right groove 61 and the outer periphery of the second step 322 jointly accommodate the portion of the shield cover 4 close to the right end, preventing the shield cover 4 from moving to the right in the axial direction.

[0049] The motor of the present embodiment prevents the shield from moving in the axial direction by forming a gap between the left support ring 5 and the outer periphery of the bearing seat 311 to accommodate a portion of the left end of the shield 4, forming a gap between the right support ring 6 and the outer periphery of the second step 322 to accommodate a portion of the right end of the shield 4, and abutting the end face of the plurality of second protrusions 42 on the shield 4 with the left end of the stator 4. In addition, the plurality of first protrusions 41 on the shield 4 are at least partially accommodated in the corresponding stator slots 21 in the circumferential direction, preventing the shield 4 from rotating in the circumferential direction. Thus, by limiting the shield 4 in the radial, axial, and circumferential directions, the shield 4 can be stably fixed between the rotor 1 and the stator 2, avoiding direct contact between the potting glue and the hydraulic oil, and the shield 4' serves to isolate the distributed capacitance of the stator and the rotor, avoiding the electrical corrosion of the rotor bearing.

[0050] Embodiment Two

[0051] The motor of Embodiment Two and the motor of Embodiment One share the same housing, stator, and rotor, and have a shield disposed between the stator and the rotor in the same axial direction. The difference between the two is that the left support ring, the right support ring, and the shield in Embodiment One are designed as an integrated structure in Embodiment Two, which reduces the number of parts compared to the motor of Embodiment One, simplifying the management and installation of parts. Details are as follows:

[0052] In some embodiments, the plurality of protrusions 41' extend radially outward and are accommodated in the corresponding stator slots 21, and the radial cross-section of the plurality of protrusions 41' includes an arc-shaped outer edge, and the highest end of the plurality of protrusions 41' is close to the outer side of the stator slot 21.

[0053] In some embodiments, one end of the shield 4' close to the right end cover 32 is provided with a circumferential folded edge 44' radially outward.

[0054] In some embodiments, the plurality of protrusions 41' are disposed in the middle portion of the shield 4' in the axial direction, and the position of the protrusions 41' is adapted to the stator 2 to be accommodated in the corresponding stator slots 21.

[0055] As Figure 17As shown, the shield 4' of the second embodiment has a longer axial length than the shield 4 of the first embodiment because the shield 4' of the second embodiment includes the structure of the left and right end support rings. The shield 4' of the second embodiment has a circular ring structure. The right end of the shield 4' is provided with a radially outwardly turned edge 44'. The shield 4' is provided with a plurality of protrusions 41' arranged in an array along the outer periphery of the shield 4'. Each of the protrusions 41' extends along the axial direction and has an axial length adapted to the axial length of the stator 2 so as to be completely accommodated in the stator slot 21. The two ends of the protrusion 41' are respectively kept a certain distance from the two ends of the shield 4'. A portion of the shield 4' close to the left end is sleeved on the outer periphery of the bearing seat 311, and the left end of the shield 4' is in contact with the inner wall of the left end plate 31 to prevent the shield 4' from moving leftward along the axial direction. A portion of the shield 4' close to the right end is sleeved on the outer periphery of the second step 322, and the edge 44' of the shield 4' is opposite to the inner surface 3211 of the first step 321. In the second embodiment, the right end surface 441' of the edge 44' is in abutment with the inner surface 3211 of the second step 321 through a sealing ring to seal between the motor stator 2 and the right end plate 32, and to prevent the shield 4' from moving rightward along the axial direction.

[0056] As shown in Figs. 1 and 2, Figure 15 and Figure 16 As shown, the radial height of the protrusions 41' of the second embodiment is higher than that of the first embodiment. The radial cross section of the protrusion 41' includes an arc-shaped outer edge to avoid scratching the winding. The protrusions 41' extend into the stator slot 21 and are close to the outer surface of the stator slot 21. On the one hand, since each protrusion 41' is accommodated in the corresponding stator slot 21, the shield 4' is prevented from rotating along the circumferential direction, thereby ensuring the stability of the shield 4'. On the other hand, since the highest end of the radially extending protrusion 41' is close to the radial outer surface of the stator slot 21, the protrusions 41' replace the insulation paper between the stator slots 21 in the prior art. The protrusions 41' are inserted between the windings 7 in the stator slot 21 to insulate different conductors, prevent current leakage and short circuit, and ensure the safety of the motor. Therefore, the shield 4' of the second embodiment is made of a non-magnetic conductive and electrically insulating material, preferably plastic.

[0057] The shield cover 4' in the motor structure of the embodiment comprises a support ring at both ends of the stator and a structure of insulating paper, the number of internal components of the motor is reduced, and the assembly time is correspondingly reduced, so that the cost can be reduced; in addition, the plurality of protrusions 41' of the shield cover 4' are accommodated in the corresponding stator slots 21 to limit the circumferential direction of the shield cover 4', so as to prevent the shield cover 4' from rotating in the circumferential direction; the two ends of the shield cover 4' abut against the left end plate 31 and the right end plate 32 respectively, so as to prevent the shield cover 4' from moving in the axial direction, so that when the stator 2 is sealed, the shield cover 4' will not move and can be stably fixed between the rotor 1 and the stator 2, so as to avoid that the sealing glue directly contacts the hydraulic oil, and meanwhile, the shield cover 4' plays a role of isolating the distributed capacitance of the stator and the rotor, so as to avoid the electric corrosion of the rotor bearing.

[0058] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements or the interaction relationship between two elements.

[0059] For ordinary skilled persons in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. It is contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification.

[0060] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and modifications to the above embodiments within the scope of the present application.

[0061] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure made by using the content of the present application specification and drawings, or directly or indirectly used in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. An electric machine with a shield, comprising a housing (3) which is a hollow structure, a rotor (1) and a stator (2) sleeved on the outer periphery of the rotor (1) being arranged inside the housing (3) along the same axis, the stator (2) having an inner surface, the stator (2) being provided with a plurality of stator slots (21) for accommodating windings (8) along the circumference, the plurality of stator slots (21) being spaced apart from each other along the circumference; characterized in that, The motor further comprises: A shield cover in a circular ring structure is arranged between the stator (2) and the rotor (1) and along the same axis as the stator (2) and the rotor (1), and is radially limited by the inner surface of the stator (2); the outer periphery of the shield cover is provided with a plurality of convex strips in the circumferential direction, the plurality of convex strips are arranged in the circumferential direction, each of the plurality of convex strips extends in the axial direction of the shield cover and is at least partially accommodated in the corresponding stator slot (21) in the radial direction; the shield cover is circumferentially limited in the stator slot (21) by the plurality of convex strips; the two ends of the shield cover in the axial direction are directly or indirectly in contact with the two ends of the shell (3), and the shield cover is axially limited.

2. The electric machine with a shield according to claim 1, characterized in that, The part near one end of the inside of the shell (3) is provided with a first end plate (31), and the other end of the shell (3) is detachably provided with a second end plate (32), the first end plate (31), the second end plate (32) and the stator (2) are arranged along the same axis, one end of the shield cover is at least partially sleeved on the first end plate (31), and the other end of the shield cover is at least partially sleeved on the second end plate (32).

3. The electric machine with a shield according to claim 2, characterized in that, Each of the plurality of convex strips comprises a first protruding portion (41) and a second protruding portion (42), the first protruding portion (41) and the second protruding portion (42) are connected in the axial direction of the shield cover, the cross section of the first protruding portion (41) perpendicular to the axial direction of the shield cover comprises an arc-shaped outer edge, and the two ends of the second protruding portion (42) symmetrically protrude a part of the two ends of the first protruding portion (41) in the circumferential direction; The first protruding portion (41) is at least partially accommodated in the corresponding stator slot (21); the first protruding portion (41) and the second protruding portion (42) have the same height in the radial direction and the highest end is close to the inner side of the stator slot (21); the second protruding portion (42) is in abutment with one end of the stator (2) in the axial direction to limit the axial direction.

4. The electric machine with a shield according to claim 3, characterized in that, The motor comprises a first support ring (5), the first support ring (5) is sleeved on the first end plate (31), and the first support ring (5) is arranged at one end of the shield cover.

5. The electric machine with a shield according to claim 4, characterized in that, The first support ring (5) is provided with a circumferential first groove (51) on the inner surface near one end of the shield cover, and one end of the shield cover is at least partially accommodated in the first groove (51).

6. The electric machine with a shield according to claim 5, characterized in that, The motor further comprises a second support ring (6), the second support ring (6) is arranged at the other end of the shield cover; the second support ring (6), the first support ring (5) and the shield cover are arranged along the same axis.

7. The electric machine with a shield according to claim 6, characterized in that, The second support ring (6) is provided with a circumferential second groove (61) on the inner surface near one end of the shield cover, and the other end of the shield cover is at least partially accommodated in the second groove (61).

8. The electric machine with a shield according to claim 2, characterized in that, The plurality of said bars extend radially outward and are housed in corresponding stator slots (21), the radial cross-section of said bars comprising an arcuate outer edge and the highest end of said bars being proximate to the outer side of said stator slots (21).

9. The electric machine with a shield according to claim 8, characterized in that, One end of said shield proximate to said second end plate (32) is provided with a circumferential flange extending radially outward.

10. The electric machine with a shield according to claim 9, characterized in that, A plurality of said bars are arranged axially in the middle portion of said shield, the position of said bars being adapted to said stator so as to be housed in corresponding stator slots.

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