Permanent magnet synchronous traction motor rotor with embedded sealing blocks and air gap sealing structure

Abstract

The invention relates to a motor rotor sealing structure, in particular to a permanent magnet synchronous traction motor rotor and air gap sealing structure with an embedded sealing block, which comprises an inverted-T-shaped sealing block, two abdicating grooves are designed on two sides of the groove-shaped lower end of a stator end plate, and the inverted-T-shaped sealing block is axially embedded into the stator end plate. The two radial sides are supported in the abdicating grooves in the two sides of the stator end plate; the end portions of the cantilever type sealing covers extending out of the transmission end cover and the non-transmission end cover are machined into planes, and after the end covers at the two ends of the motor are assembled, the planes of the end portions of the sealing covers are attached to the tooth portions of the stator end plates at the two ends and the inverted-T-shaped sealing blocks. Through redesign of the permanent magnet motor rotor and the air gap sealing structure, an embedded design thought is provided, on one hand, the installation reliability of the sealing structure is improved, on the other hand, the part structure and the assembly structure in the sealing design are simplified, and the motor manufacturing cost is reduced while the sealing requirement of the permanent magnet motor rotor is met; the service life of the motor is prolonged, and reliable operation of the motor is better ensured.

Description

TECHNICAL FIELD

[0001] The application relates to a motor rotor sealing structure, in particular to a permanent magnet synchronous traction motor rotor and an air gap sealing structure with sealing blocks embedded. BACKGROUND

[0002] The permanent magnet synchronous motor has become an important development direction in the future railway transportation field due to the characteristics of high efficiency, energy saving and environmental protection. Unlike the electrically excited motor, the permanent magnet synchronous motor is assembled with permanent magnets, and an air gap magnetic field is established through the permanent magnets. When the current passes through the stator winding, an armature magnetic field is generated in the stator winding, interacts with the magnetic field generated by the permanent magnet, and generates an electromagnetic torque, thereby driving the motor to rotate.

[0003] Because the permanent magnet motor rotor is assembled with permanent magnets, the rotor has strong magnetism, and a large amount of metal powder and dust is generated during the operation of the locomotive vehicle. If the rotor is not protected, the metal powder and dust will enter the motor interior along with the cooling air, be adsorbed on the surface of the permanent magnet rotor, and be accumulated between the stator and rotor air gaps. Long-time operation will make the motor air gap uneven, and in severe cases, will cause the stator and rotor to rub and sweep the bore, resulting in motor operation failure. Therefore, the air gap between the motor rotor and the stator must be closed and sealed for protection during normal operation of the permanent magnet motor. Therefore, it is important to optimize the rotor sealing structure.

[0004] According to the patent CN109687630B, the existing permanent magnet motor rotor sealing structure is shown in Figure 1 and Figure 2 : The permanent magnet motor rotor sealing structure mainly includes a non-drive end cover 1, a sealing strip 2, a sealing plate 3, a stator end plate 4, a stator core 5, a rotor 6, a drive end cover 7, and a machine base 8. The existing permanent magnet motor is processed with a stepped plane on the stator end plate 4 at both ends. After the sealing plate 3 is coated with sealing glue, it is pasted on the stator end plate 4. The slot opening of the motor coil will be filled with a certain height of sealing glue 9, and part of the sealing glue 9 will be pressed on the sealing plate 3, thereby also playing a certain fixing role on the sealing plate 3. The drive end cover 7 and the non-drive end cover 1 of the motor are designed with an extended cantilever sealing cover, and the sealing strip 2 is bonded in the groove at the end of the sealing cover. After the motor drive end cover is assembled, the sealing strip 2 is pressed on the sealing plate 3, thereby playing a role in blocking the cooling air from passing through the rotor, and thus completing the sealing between the permanent magnet rotor and the air gap.

[0005] The structure of the existing permanent magnet motor sealing plate 3 is shown in Figure 3 : The sealing plate 3 is uniformly distributed with a tooth-shaped structure on the outer side, which is used for insertion between the stator coils and corresponds to the stator tooth slot. The sealing plate 3 is pasted on the stator end plate 4, and several sealing plates 3 are pasted around the core circle. The arc surfaces are spliced with each other, thereby being arranged in a circular shape to form a ring-shaped sealing plate, which, together with the sealing strip 2, realizes the sealing of the permanent magnet rotor.

[0006] The disadvantages of the existing permanent magnet motor rotor sealing structure are as follows: 1. The sealing plate mounting method: first, the sealing plate 3 is a laminated plate material, which is bonded to the stator end plate 4 by applying sealant on its A surface, and the sealant in the stator slot will press on the B surface of the sealing plate 3. When the traction motor runs at high speed, the motor itself will heat up, and the ambient temperature will also affect the sealing plate 3 and the sealant in the stator slot, which will expand due to the difference in expansion coefficient. When the motor works for a long time, the radial expansion of the sealant will cause the sealing plate 3 in contact with it to fall off, which will cause the motor to rub and sweep the bore, affecting the safety of operation.

[0007] Secondly, several sealing plates 3 need to be pasted on the stator end plate 4, and the circular arcs are spliced to form a ring-shaped sealing plate, which is extruded with the sealing strip 2 to realize the sealing of the permanent magnet rotor; but the sealing plate 3 and the sealing plate 3 are spliced without similar stop port matching assembly structure, and the outer diameter of the locomotive motor is large, which leads to the difficulty of circular arrangement of the ring-shaped sealing plate composed of several sealing plates, and the assembly size is difficult to control.

[0008] 2. The use of the sealing strip: the existing rotor sealing structure realizes sealing by extruding the sealing strip 2 between the end cover and the sealing plate 3. The sealing strip 2 is made of rubber material and is bonded to the end cover, which cannot be reused when the motor is disassembled, that is, a new sealing strip needs to be replaced every time the motor is disassembled, causing waste. On the one hand, the service life of rubber products is short, and heat aging is serious, so it must be disassembled and replaced regularly, which brings inconvenience to the operation of the motor. SUMMARY

[0009] In order to solve the problem of poor reliability of the existing rotor sealing structure, the application provides a permanent magnet synchronous traction motor rotor and air gap sealing structure with embedded sealing block mounting, which designs a new stator end plate slot type structure and sealing block structure, proposes a new structure of embedded permanent magnet rotor and air gap sealing, meets the sealing requirements of the permanent magnet rotor, improves the installation reliability and usability of the sealing structure, and ensures the safe and reliable operation of the permanent magnet motor.

[0010] The application is implemented by adopting the following technical scheme: a permanent magnet synchronous traction motor rotor and air gap sealing structure with embedded sealing block mounting, comprising a convex-shaped sealing block, two let-out grooves are designed on both sides of the lower end of the stator end plate slot type, the convex-shaped sealing block is axially embedded in the stator end plate, and the radial two sides are supported in the let-out grooves on both sides of the stator end plate; the end part of the cantilever type sealing cover protruding from the transmission end cover and the non-transmission end cover is processed into a plane, the sealing cover end part plane is attached to the tooth part of the stator end plate and the convex-shaped sealing block when the motor end covers are assembled, and the part of the motor coil out of the stator slot is filled with sealant.

[0011] The convex seal block is embedded into the permanent magnet synchronous traction motor rotor and the air gap sealing structure.

[0012] The convex seal block is embedded into the permanent magnet synchronous traction motor rotor and the air gap sealing structure.

[0013] The convex seal block is embedded into the permanent magnet synchronous traction motor rotor and the air gap sealing structure.

[0014] The convex seal block is embedded into the permanent magnet synchronous traction motor rotor and the air gap sealing structure.

[0015] The convex seal block is embedded into the permanent magnet synchronous traction motor rotor and the air gap sealing structure.

[0016] The convex seal block is embedded into the permanent magnet synchronous traction motor rotor and the air gap sealing structure.

[0017] The beneficial effects brought by the technical scheme of the present application are as follows: By redesigning the permanent magnet motor rotor and air gap sealing structure, the embedded design idea is proposed, which improves the installation reliability of the sealing structure, simplifies the structure and assembly structure of the sealing design, meets the sealing requirements of the permanent magnet motor rotor, reduces the manufacturing cost of the motor, prolongs the service life of the motor, and better ensures the reliable operation of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The existing permanent magnet motor rotor sealing structure diagram.

[0019] Figure 2 The existing permanent magnet motor rotor sealing structure local enlarged view.

[0020] Figure 3 The existing permanent magnet motor sealing plate structure diagram.

[0021] Figure 4 The permanent magnet motor rotor sealing structure diagram of the present application.

[0022] Figure 5 The permanent magnet motor rotor sealing structure local enlarged view of the present application.

[0023] Figure 6The permanent magnet motor sealing block installation schematic diagram of the application.

[0024] Figure 7 The permanent magnet motor sealing block structure diagram of the application.

[0025] Figure 8 The permanent magnet motor stator end plate slot type structure diagram of the application.

[0026] In the figure: 1-non-drive end cover, 2-sealing strip, 3-sealing plate, 4-stator end plate, 5-stator core, 6-rotor, 7-drive end cover, 8-machine base, 9-potting glue, 10-sealing block. DETAILED DESCRIPTION EMBODIMENT

[0027] The permanent magnet motor rotor and air gap sealing structure is as shown in Figure 4 , 5 , 6, the convex sealing block 10 is embedded into the stator end plate 4 on both sides of the motor after being smeared with sealing glue, the number of embedded blocks is the same as the number of stator lamination teeth, at the same time, the two sides of the sealing block 10 can be borne on the stator end plate 4, so that the convex sealing block 10 is fixed in the axial and radial directions at the same time, the motor coil out of the stator slot part normally carries out slot potting, and the lower side of the potting glue 9 is still pressed on the top of the convex sealing block 10 after potting; the end part of the cantilever type sealing cover extending out of the drive end cover 7 and the non-drive end cover 1 is processed into a plane and smeared with sealing glue, when the two end covers of the motor are assembled, the plane of the end part of the sealing cover is matched with the tooth part of the two end stator end plates 4 and the convex sealing block 10. The sealing between the permanent magnet motor rotor and the air gap is realized through the cooperation of the two side end covers, the stator end plate 4 and the convex sealing block 10. In the sealing structure, on the one hand, the structure and installation structure of the sealing convex sealing block 10 are innovated, and the risk of failure of the sealing structure under the condition of high temperature rise during long-time operation of the motor is avoided, on the other hand, the sealing strip and other rubber products are no longer used in the sealing structure, and the cost and service life of the motor are saved.

[0028] The structure of the convex sealing block 10 is as shown in Figure 7 , the convex sealing block 10 is used in the application to replace the sealing plate 3 in the prior art, and is used for sealing the stator slot. The convex sealing block 10 in the application adopts an independent assembly structure, does not need to be arranged in a circle, is similar to a whole slot wedge and is embedded into the stator end plate slot type, the structure of the convex sealing block 10 is simple, the assembly consistency is strong, and the assembly stability of the convex sealing block 10 is ensured.

[0029] The stator end plate 4 slot type structure is as shown in Figure 8As shown, in order to ensure that the convex sealing block 10 is assembled into the stator end plate 4, the slot type of the stator end plate 4 in the application is different from the traditional rectangular slot, and two accommodation slots are designed on both sides of the lower end of the slot type, which have the same size as the convex sealing block 10, meet the assembly of the convex sealing block 10, and the structure makes the convex sealing block 10 axially embedded into the stator end plate 4, and the radial two sides can also be borne on the stator end plate 4, which fully ensures the assembly stability of the convex sealing block 10 and avoids the risk of falling.

Claims

1. A permanent magnet synchronous traction motor rotor and air gap sealing structure with seal block embedded installation, characterized in that: Including convex seal block (10), the stator end plate (4) is designed two let place slots at both sides of the slot type lower end, the convex seal block (10) is axially embedded in the stator end plate (4), and the radial two sides are borne in the two sides let place slots of the stator end plate (4);The cantilever type seal cover end of the drive end cover (7) and the non-drive end cover (1) is processed into a plane, when the motor two end covers are assembled, the seal cover end plane is attached with the tooth part of the two end stator end plate (3), the convex seal block (10), the coil of the motor is out of the stator slot mouth part and is sealed with pouring glue (9).

2. The sealed block-embedded permanent magnet synchronous traction motor rotor and air gap sealing structure according to claim 1, characterized in that: The embedded block number of the convex seal block (10) is same with the stator punching piece tooth number.

3. The air-gap sealed permanent magnet synchronous traction motor rotor and air-gap sealing structure of claim 1 or 2, wherein: The convex seal block (10) is embedded on the two side stator end plate (4) after smearing sealant.

4. The air-gap sealed permanent magnet synchronous traction motor rotor and air-gap seal structure of claim 1 or 2, wherein: When assembling, smear sealant on the seal cover end plane.

5. The air-gap sealed permanent magnet synchronous traction motor rotor and air-gap seal structure of claim 1 or 2, wherein: The sealing between the permanent magnet motor rotor and air gap is realized by the cooperation of the two side end covers, the stator end plate (4) and the convex seal block (10).

6. The air-gap sealed permanent magnet synchronous traction motor rotor and air-gap seal structure of claim 1 or 2, wherein: The convex seal block (10) adopts independent assembly structure and is embedded in the stator end plate slot type as a whole.

7. The air-gap sealed permanent magnet synchronous traction motor rotor and air-gap seal structure of claim 1 or 2, wherein: After the slot pouring sealing of the coil of the motor is out of the stator slot mouth part, the pouring glue lower side is pressed on the top of the convex seal block (10).

8. The air-gap sealed permanent magnet synchronous traction motor rotor and air-gap seal structure of claim 3, wherein: The convex seal block (10) adopts independent assembly structure and is embedded in the stator end plate slot type as a whole.

9. The sealed block-embedded mounted permanent magnet synchronous traction motor rotor and air gap sealing structure of claim 4, wherein: The sealing between the permanent magnet motor rotor and air gap is realized by the cooperation of the two side end covers, the stator end plate (4) and the convex seal block (10).

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