Permanent magnet motor stator with series cooling water circuit

Abstract

The application discloses a kind of series cooling water path permanent magnet motor stator, including stator frame, stator core, winding and series cooling water path system, stator frame is cage frame, series cooling water path system includes the slot water pipe assembly in stator tooth portion, yoke water pipe in stator yoke portion, and inlet / outlet water main pipe in stator end portion, the series cooling water path system in slot water pipe assembly, yoke water pipe and inlet / outlet water main pipe between series connection, connection mode is welding, slot water pipe assembly and yoke water pipe satisfy one-to-one correspondence in quantity.The application is reasonable in design, simple in structure, stable and reliable, easy to maintain, cooling water path is close to heat source, high heat dissipation efficiency, can greatly improve permanent magnet motor power density and the like performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric machines, and particularly relates to a permanent magnet motor stator with series cooling water path. BACKGROUND

[0002] In order to improve performance indexes such as power density, high-performance permanent magnet motors must adopt higher electric load and magnetic load, and the motor thermal load and copper consumption also increase. If the heat generated by the motor stator cannot be quickly discharged, it will cause the temperature of key components such as motor windings and rotor permanent magnets to rise too fast and too high, thereby affecting the stable operation of the motor and greatly reducing the service life of the motor.

[0003] Traditional high-performance permanent magnet motors often adopt frame water cooling or core yoke pipe water cooling or slot pipe water cooling and slot water cooling plus frame water cooling composite cooling technology to cool the motor, and the heat generated by the motor stator is taken away through the circulation of cooling water.

[0004] The traditional frame water cooling technology has the defects of water channel corrosion and long distance from the heat source, the traditional core yoke pipe and slot pipe cooling technology has the defects of complex process, occupation of internal space of the motor, and many welding points, and the existing slot water cooling plus frame water cooling composite cooling technology also has the defects of complex structure, many external interfaces, and high engineering implementation difficulty. SUMMARY

[0005] In order to solve the above technical problems, the application provides a permanent magnet motor stator with series cooling water path, which has the advantages of simple structure, reasonable design, uniform cooling, and good heat dissipation effect.

[0006] In order to achieve the above purpose, the technical scheme adopted by the application to solve the technical problems is as follows: a permanent magnet motor stator with series cooling water path, comprising a stator frame, a stator core and a winding, the stator frame is a cage-shaped frame, the stator core is composed of stator tooth portions on the inner circle and stator yoke portions on the outer circle, and the yoke portions have openings, the winding is located in the stator tooth portions, and the outer circle of the stator core and the inner circle of the stator frame are welded integrally; further comprising a series cooling water path system, the series cooling water path system comprises m (m is an even number) groups of slot water pipe assemblies located in the stator tooth portions, n (n is an even number) yoke water pipes located in the stator yoke portions, and an inlet / outlet water main pipe located at the end of the stator, the slot water pipe assemblies and the yoke water pipes in the series cooling water path system are connected in series with the inlet / outlet water main pipe, the connection mode is welding, the medium in the pipe is oil or water, and the medium in the series cooling water path system has two flow paths: the inlet water main pipe→the slot water pipe assembly→the yoke water pipe→the outlet water main pipe; the inlet water main pipe→the yoke water pipe→the slot water pipe assembly→the outlet water main pipe.

[0007] The slot water pipe assembly in the series cooling water circuit system of the permanent magnet motor stator is uniformly embedded in the stator tooth portion in a reverse phase interval along the circumference, the yoke water pipe is uniformly embedded in the opening of the stator yoke portion, and the water inlet / outlet main pipe is arranged in the ring shape at the stator end portion and is fixed on the stator base by the bracket or the support.

[0008] The slot water pipe assembly of the series cooling water circuit permanent magnet motor stator is composed of k cooling water pipes (k>=1), the cooling water pipe is a seamless steel pipe including a straight line portion and an arc line portion, the straight line portion is embedded in the stator tooth portion, the arc line portion is located at the stator end portion, and the inlet and outlet of the cooling water pipe are welded and connected with the yoke water pipe or the water inlet / outlet main pipe at the same end.

[0009] The yoke water pipe of the series cooling water circuit permanent magnet motor stator has a straight pipe at one end to pass through the opening of the stator yoke portion, and the other end can be bent to be welded with the slot water pipe assembly or the water inlet / outlet main pipe, the yoke water pipe corresponds to the slot water pipe assembly one by one, and the number satisfies n=mk.

[0010] The slot water pipe assembly, the yoke water pipe and the water inlet / outlet main pipe of the series cooling water circuit permanent magnet motor stator are square pipes or round pipes made of stainless steel, copper alloy or titanium alloy.

[0011] The beneficial effects of the present application are:

[0012] 1. The slot water pipe assembly in the series cooling water circuit system of the present application is uniformly embedded in the stator tooth portion, which can effectively block the heat transfer from the stator to the rotor, and the yoke water pipe is uniformly arranged in the stator yoke portion, which can quickly take away the heat generated by the winding, thereby ensuring the stable operation of the permanent magnet motor and improving the service life of the motor.

[0013] 2. The slot water pipe assembly, the yoke water pipe and the water inlet / outlet main pipe in the series cooling water circuit system of the present application are arranged in series, each yoke water pipe corresponds to a slot water pipe, and the cooling water circuit can uniformly take away the heat of the stator.

[0014] 3. The series cooling water circuit system of the present application has only one water circuit, only one set of external cooling water interface is needed, the structure is simple, the engineering implementation difficulty is low, the motor cooling water pipe has few welding points, the reliability is high, and the present application can be widely applied to high power density permanent magnet motors. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a sectional view of the main structure of the present application.

[0016] Figure 2 It is a three-dimensional layout schematic diagram of the present application.

[0017] Figure 3 It is a cooling water circuit schematic diagram of the present application.

[0018] Figure 4 Layout diagram of the slot water pipe assembly of the present application;

[0019] Figure 5 Layout diagram of the slot water pipe assembly and yoke water pipe of the present application;

[0020] Figure 6 Layout diagram of the yoke water pipe of the present application.

[0021] The reference signs are as follows: 1 - stator frame, 2 - stator core, 2a - stator yoke, 2b - stator tooth, 3 - winding, 4 - series cooling water circuit system, 4a - slot water pipe assembly, 4b - yoke water pipe, 4c - water inlet / outlet main pipe. DETAILED DESCRIPTION

[0022] The present application is further described in detail below in conjunction with the accompanying drawings and examples.

[0023] Referring to Figure 1 , Figure 2 and Figure 3 , the present application discloses a series cooling water circuit permanent magnet motor stator, which comprises a stator frame 1, a stator core 2, a winding 3 and a series cooling water circuit system 4. The stator frame 1 is a cage-shaped frame welded by a circumferential ring plate and an axial rib plate. The stator core 2 is formed by laminating stator punching sheets with an inner circle provided with stator teeth 2b and an outer circle provided with a stator yoke 2a with openings. The stator teeth 2b are embedded in the winding 3, and the outer circle of the stator core 2 is welded with the inner circle of the stator frame 1 to form an integrated body for transmitting torque. The series cooling water circuit system 4 comprises m sets of slot water pipe assemblies 4a located at the stator teeth 2b, n yoke water pipes 4b located at the stator yoke 2a and a water inlet / outlet main pipe 4c located at the end of the stator. m and n are even numbers. The slot water pipe assemblies 4a and the yoke water pipes 4b in the series cooling water circuit system 4 are connected in series with the water inlet / outlet main pipe 4c in a welding manner. The medium in the pipes is oil or water. There are two circulation paths of the medium in the series cooling water circuit system 4 (refer to Figure 3 ): water inlet main pipe → slot water pipe assembly 4a → yoke water pipe 4b → water outlet main pipe; water inlet main pipe → yoke water pipe 4b → slot water pipe assembly 4a → water outlet main pipe.

[0024] Referring to Figure 4 , Figure 5 and Figure 6As shown, the notch water pipe assembly 4a in the series cooling water system 4 is uniformly and oppositely embedded in the stator tooth portion 2b, the yoke water pipe 4b is uniformly embedded in the opening of the stator yoke portion 2a, and the inlet / outlet water main pipe 4c is arranged in the ring shape at the end of the stator and is fixed on the stator frame 1 by the bracket or support. The notch water pipe assembly 4a is composed of k cooling water pipes (k≥1), the cooling water pipe is wound by a seamless steel pipe, including the straight line portion and the arc line portion, the straight line portion is embedded in the stator tooth portion 2b, the arc line portion is located at the end of the stator, the water pipes are not crossed, the inlet and outlet of the single cooling water pipe are welded and connected with the yoke water pipe 4b or the inlet / outlet water main pipe 4c at the same end. The yoke water pipe 4b is a straight pipe at one end to pass through the opening of the stator yoke portion 2a, and is bendable at the other end to be welded with the notch water pipe assembly 4a or the inlet / outlet water main pipe 4c, the yoke water pipe 4b corresponds to the notch water pipe assembly 4a one by one, and the number satisfies n=mk.

[0025] Further, the notch water pipe assembly 4a, the yoke water pipe 4b and the inlet / outlet water main pipe 4c are square pipes or round pipes made of stainless steel, copper alloy or titanium alloy.

[0026] The above description is only used to illustrate the specific technical solutions of the present application, and is not limited to the present application, the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the 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 series cooling water channel permanent magnet motor stator, comprising a stator frame (1), a stator core (2) and a winding (3), wherein the stator frame (1) is a cage frame, and is characterized in that: The stator core (2) is formed by laminating an inner circle stator tooth portion (2b), an outer circle stator yoke portion (2a) and an open stator punching sheet, the winding (3) is located on the stator tooth portion (2b), and the outer circle of the stator core (2) is welded to the inner circle of the stator frame (1); and the stator core (2) further comprises a series cooling water system (4), the series cooling water system (4) comprising m groups of slotted water pipe assemblies (4a) located on the stator tooth portion (2b), n yoke water pipes (4b) located on the stator yoke portion (2a) and an inlet / outlet water main pipe (4c) located at the end of the stator, m and n being even numbers, the slotted water pipe assemblies (4a) and the yoke water pipes (4b) are connected in series with the inlet / outlet water main pipe (4c), the connection method being welding, and the medium in the pipe is oil or water; the slotted water pipe assemblies (4a) are evenly and alternately embedded in the stator tooth portion (2b) along the circumference. The stator teeth (2b) and the yoke water pipe (4b) are evenly embedded in the openings of the stator yoke (2a); the inlet / outlet water main pipe (4c) is annular and is fixed to the stator frame (1) by a bracket or a support; the slot water pipe assembly (4a) is composed of k cooling water pipes, k≥1, and the cooling water pipe is a seamless steel pipe including a straight portion and an arc portion, the straight portion is embedded in the stator teeth (2b), and the arc portion is located at the end of the stator, and the inlet and outlet of the cooling water pipe are welded to the yoke water pipe (4b) or the inlet / outlet water main pipe (4c) at the same end; one end of the yoke water pipe (4b) is a straight pipe passing through the opening, and the other end is a bent pipe welded to the slot water pipe assembly (4a) or the inlet / outlet water main pipe (4c), and the number of the yoke water pipe (4b) and the slot water pipe assembly (4a) satisfies n=mk.

2. The stator of a permanent magnet motor with series cooling water circuit according to claim 1, characterized in that: The notched water pipe assembly (4a), the yoke water pipe (4b), and the inlet / outlet water main pipe (4c) are square tubes or round tubes made of stainless steel, copper alloy, or titanium alloy.

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