A yoke-cooled electric machine stator

Abstract

The present invention discloses a yoke-cooled motor stator, comprising a stator frame, a stator core, windings, a yoke pressure plate, a wedge-shaped pressure strip, and a yoke cooling system. The yoke cooling system comprises a water inlet manifold, a cooling water pipe, and a water outlet manifold. The water inlet manifold and the water outlet manifold are welded to the stator frame. The cooling water pipe is a continuous U-shaped coil, radially compressed by the wedge-shaped pressure strip within the open slot of the stator core yoke. The cooling water pipe inlet and outlet are welded to the water inlet and outlet manifolds, respectively. The present invention has a simple structure, a cooling system with few welding points, high reliability, and the welding points are located outside the motor, making maintenance easy. The cooling water pipe is close to the heat source, providing uniform and efficient cooling, which can greatly improve the life of the motor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of motor cooling, and particularly relates to a yoke cooling motor stator. BACKGROUND

[0002] The existing motor yoke water cooling methods mainly include the following two kinds: one is water jacket cooling technology; and the other is stator core yoke pipe cooling technology.

[0003] The traditional water jacket cooling technology is to embed a cooling water channel in the outer circle of the stator core. The cooling water channel is divided into S-shaped along the axial direction and spiral-shaped along the circumferential direction. The disadvantage of this cooling technology is that the heat source is far away from the cold source, the heat conduction path is long, and the unidirectional flow of the water flow leads to uneven heat dissipation. In addition, the cooling water channel is easy to corrode, the reliability is poor, and the motor life is affected.

[0004] The traditional stator core yoke pipe technology is to insert a cooling water pipe into the yoke and weld the water pipes in series at the end. In this cooling technology, the cooling water pipe is a straight pipe, and a large number of water pipes need to be welded on site. The motor has many welding points inside, the reliability is reduced, and there is a gap between the inserted cooling water pipe and the yoke of the core, the thermal resistance is increased, and the heat dissipation efficiency is low. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a yoke cooling motor stator which has simple structure, uniform cooling, good heat dissipation effect, high reliability and convenient maintenance.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application to solve its technical problems is as follows: a yoke cooling motor stator, comprising a stator frame, a stator core and a winding, the stator frame is a cage-shaped frame with water inlet / outlet main pipes, the stator core is composed of a stator tooth portion on the inner circle and a stator yoke portion on the outer circle, and the yoke portion has a stator lamination with an open slot, the winding is located in the stator tooth portion, and the stator core is fixed with a yoke pressing plate at both ends by means of a draw bar and a bolt; further comprising a yoke cooling system, the yoke cooling system is composed of one water inlet main pipe, one water outlet main pipe and m (m≥2) groups of cooling water pipes arranged in parallel and uniformly in the stator yoke portion, the water inlet main pipe and the water outlet main pipe are embedded and welded on the stator frame, the cooling water pipes are continuous u-shaped coils which pass through the stator core axially n (n≥2) times, the inlet and outlet of each group of cooling water pipes are respectively welded on the water inlet main pipe and the water outlet main pipe after extending radially, and the wedge-shaped pressing strip is knocked into the open slot of the stator yoke portion along the axial direction, so that the cooling water pipes are tightly attached to the stator yoke portion, the thermal resistance is reduced and the heat dissipation efficiency is improved, and the medium in the pipe is oil or water.

[0007] The water inlet main pipe and the water outlet main pipe are arranged in the middle and both ends of the stator frame respectively, and the water pipe inlet and outlet are arranged in the middle and both ends of the stator core respectively, and the one-to-one correspondence is met.

[0008] The number of the opening slots of the stator yoke part satisfies k=mn, and the outer circle of the stator yoke part and the inner circle of the stator frame are welded integrally to transmit torque.

[0009] The cooling water pipe is a continuous u-shaped coil pipe formed by winding a stainless steel seamless steel pipe.

[0010] The water inlet main pipe, the water outlet main pipe and the cooling water pipe are square pipes or round pipes made of stainless steel, copper alloy or titanium alloy.

[0011] The wedge-shaped pressing strip is a metal material with good heat conductivity and certain rigidity, such as aluminum or copper.

[0012] The present application has the following beneficial effects:

[0013] 1. The cooling water pipe of the yoke cooling system is a continuous u-shaped coil pipe, which is uniformly embedded in the opening slots of the stator yoke part, and the wedge-shaped pressing strip is used to make the cooling water pipe tightly contact with the stator yoke part, so that the cooling water pipe is arranged in parallel and close to the heat source, the yoke cooling effect is good, and the heat dissipation is uniform.

[0014] 2. The yoke cooling system does not need to be welded between the water pipes at the end, and only needs to be welded between the inlet and outlet of each group of cooling water pipes and the water inlet and outlet main pipes, so that there is no welding point in the motor, the reliability is high, the welding point is exposed outside the motor, and the maintenance is convenient.

[0015] 3. The cooling water pipe adopts an embedded assembly mode, and the water pipe inlet and outlet can be flexibly arranged at the ends of the stator, which is simple in process and saves space. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a sectional view of the main structure of the present application;

[0017] Figure 2 It is a schematic view of the shaft side of the present application;

[0018] Figure 3 It is a schematic view of the cooperation between the wedge-shaped pressing strip and the cooling water pipe of the present application;

[0019] Figure 4 It is a schematic view of the cooling water pipe of the present application;

[0020] Figure 5Fig. 1 is a schematic view of the position of the water inlet and outlet manifolds of the present application.

[0021] The reference signs are: 1 - stator frame, 2 - stator core, 2a - stator yoke, 2b - stator tooth, 3 - yoke pressing plate, 4 - wedge-shaped pressing strip, 5 - yoke cooling system, 5a - water inlet manifold, 5b - water outlet manifold, 5c - cooling water pipe, 6 - winding. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below with reference to the accompanying drawings and examples.

[0023] Referring to Figure 1 , Figure 2 and Figure 3 , the present application discloses a yoke-cooled motor stator, which comprises a stator frame 1, a stator core 2, a yoke pressing plate 3, a wedge-shaped pressing strip 4, a yoke cooling system 5 and a winding 6. The stator frame 1 is a cage-shaped frame with water inlet / outlet manifolds, which is welded from a circumferential ring plate and an axial rib plate. The stator core 2 is made of a stator lamination stack, in which the inner circle is provided with stator teeth 2b and the outer circle is provided with a stator yoke 2a, and the yoke has 108 open slots. The winding 6 is located in the stator teeth 2b, and the stator yoke 2a and the stator frame 1 are welded together as a whole for torque transmission. The yoke pressing plate 3 is located at both ends of the stator core 2 and is fixed together with the stator core 2 by means of tie rods and bolts. The yoke cooling system 5 is composed of one water inlet manifold 5a, one water outlet manifold 5b and 18 groups of cooling water pipes 5c. The water inlet manifold 5a and the water outlet manifold 5b are embedded and welded on the axial rib plate in the middle of the stator frame 1. The cooling water pipe 5c is a continuous u-shaped coil pipe which axially penetrates the stator core 6 for 18 times. The 18 groups of cooling water pipes 5c are arranged in parallel and uniformly in the stator core yoke 2a. The inlet and outlet of each group of cooling water pipes 5c extend radially and are welded on the water inlet manifold 5a and the water outlet manifold 5b, respectively. The wedge-shaped pressing strip 4 is knocked into the open slots of the stator yoke 2a along the axial direction (see Figure 3 ), so that the cooling water pipe 5c is tightly attached to the stator yoke 2a, thereby reducing thermal resistance and improving heat dissipation efficiency. The wedge-shaped pressing strip 4 is made of metal materials with good thermal conductivity, such as aluminum and copper. The medium in the pipe is oil or water.

[0024] Referring to Figure 4 , Figure 5 , the number k of open slots of the stator yoke 2a satisfies k = mn. The cooling water pipe 5c is a continuous u-shaped coil pipe which is wound from one stainless steel seamless pipe. The water inlet manifold 5a, the water outlet manifold 5b and the cooling water pipe 5c are square or round pipes made of stainless steel, copper alloy or titanium alloy, such as 304, 316, Cu, Bfe10, etc. The wedge-shaped pressing strip 4 is a metal material with good thermal conductivity and certain rigidity.

[0025] Further, the cooling water pipe 5c inlet and outlet radial extension position is set in the middle of the stator core, and the corresponding water inlet pipe 5a and water outlet pipe 5b are set in the middle of the stator frame 1, which maximizes the end space and makes the structure simpler.

[0026] The above is only used to illustrate the specific technical solutions of the present application, and is not limited thereto, the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A yoke-cooled motor stator, comprising a stator frame (1), a stator core (2) and a winding (6), wherein the stator frame (1) is a cage-shaped frame, and is characterized in that: The stator core (2) is formed by laminating stator punching sheets with inner circle stator teeth (2b), outer circle stator yoke (2a) and open slots, the winding (6) is located on the stator teeth (2b), and yoke pressure plates (3) are fixed at both ends of the stator core (2); the stator core (2) also includes a yoke cooling system (5), the yoke cooling system (5) is composed of a water inlet main pipe (5a), a water outlet main pipe (5b) and m groups of parallel evenly arranged on the stator yoke (2a) ) is composed of a cooling water pipe (5c), an inlet main pipe (5a) and an outlet main pipe (5b) are welded on the stator frame (1), the cooling water pipe (5c) is a continuous U-shaped coil that axially passes through the stator core (2) n times, m and n ≥ 2, and the inlet and outlet of each group of cooling water pipes (5c) are extended radially and welded to the inlet main pipe (5a) and the outlet main pipe (5b) respectively, a wedge-shaped pressure strip (4) is axially arranged in the open groove, and the medium in the pipe is oil or water.

2. The yoke-cooled motor stator according to claim 1, characterized in that: The water inlet main pipe (5a) and the water outlet main pipe (5b) are respectively arranged in the middle and at both ends of the stator frame (1).

3. The yoke-cooled motor stator according to claim 2, characterized in that: The number k of the open slots satisfies k=mn, and the outer circle of the stator yoke (2a) and the inner circle of the stator base (1) are welded together.

4. A yoke-cooled motor stator according to claim 1, 2 or 3, characterized in that: The cooling water pipe (5c) is formed by winding a stainless steel seamless pipe.

5. The yoke-cooled motor stator according to claim 4, characterized in that: The water inlet main pipe (5a), the water outlet main pipe (5b) and the cooling water pipe (5c) are square tubes or round tubes made of stainless steel, copper alloy or titanium alloy.

6. The yoke-cooled motor stator according to claim 4, characterized in that: The wedge-shaped beading (4) is made of aluminum or copper.

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