Parallel cooling water circuit permanent magnet motor stator

Abstract

The application discloses a kind of parallel cooling water path permanent magnet motor stator, including stator frame, stator core, winding and parallel cooling water path system, stator frame is cage frame, parallel cooling water path system includes the slot water pipe assembly embedded in stator tooth portion, yoke water pipe embedded in stator yoke portion, with the transition water pipe of slot water pipe assembly connection and water inlet / outlet main pipe, parallel cooling water path system in slot water pipe assembly and yoke water pipe parallel between, yoke water pipe is directly connected with water inlet / outlet main pipe, slot water pipe assembly import and export are connected with water inlet / outlet main pipe by transition water pipe, and connection mode is welding.The present application is reasonable in design, cooling water path is evenly arranged near heat source, heat dissipation is uniform, efficiency is high, there is no welding spot in motor, there are few welding spots between cooling water pipes, reliability is high, structure is simple, engineering difficulty is low, and can be widely applied in high power density permanent magnet motor field.

Description

TECHNICAL FIELD

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

[0002] In order to improve performance indexes such as power density, a high-performance permanent magnet motor must adopt a 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, this 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 a machine base water cooling or core yoke pipe water cooling or slot pipe water cooling and slot water cooling plus machine base 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 machine base 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 machine base 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 parallel cooling water path permanent magnet motor stator which is simple in structure, reasonable in design, uniform in cooling, and good in heat dissipation effect.

[0006] The technical scheme adopted by the application to solve the technical problems is: a parallel cooling water path permanent magnet motor stator, comprising a stator base, a stator core and a winding, the stator base is a cage-shaped base with an inlet / outlet water main pipe, the stator core is composed of a stator lamination with a stator tooth portion on an inner circle, a stator yoke portion on an outer circle and an open slot in the yoke portion, and the winding is located in the stator tooth portion, and the stator core outer circle and the stator base inner circle are welded integrally; further comprising a parallel cooling water path system, the parallel cooling water path system comprises m (m is an even number) groups of slot opening water pipe assemblies located in the stator tooth portion, n (n is an even number) groups of yoke water pipes embedded in the stator yoke portion, a transition water pipe connected to the slot opening water pipe assembly at the stator end portion, and an inlet / outlet water main pipe embedded and welded in the middle of the stator base, the slot opening water pipe assemblies and the yoke water pipes are connected in parallel in the parallel cooling water path system, the inlet and outlet of the slot opening water pipe assemblies are connected to the inlet / outlet water main pipe through the transition water pipe, the inlet and outlet of the yoke water pipes are directly connected to the inlet / outlet water main pipe, and the cooling medium in the pipes is oil or water.

[0007] In the parallel cooling water path permanent magnet motor stator, the slotted water pipe assemblies in the parallel cooling water path system are evenly and alternately embedded in the stator teeth along the circumference; the yoke water pipes are evenly embedded in the open slots of the stator yoke when the iron cores are stacked and welded to the stator iron core; the transition water pipes are located at the end of the stator and are used to connect the slotted water pipe assemblies and the inlet / outlet water main pipes; the inlet / outlet water main pipes are annularly embedded and welded in the middle of the stator frame.

[0008] The parallel cooling water circuit permanent magnet motor stator has a slotted water pipe assembly consisting of k (k ≥ 1) cooling water pipes. The cooling water pipe is wound from a seamless steel pipe and includes a straight portion and an arc portion. The straight portion is embedded in the stator teeth, and the arc portion is located at the stator end. The water pipes do not cross, and the inlet and outlet of a single cooling water pipe are welded to the transition water pipe at the same end.

[0009] In a permanent magnet motor stator with a parallel cooling water circuit, the yoke water pipe is a continuously bent water pipe comprising n (n>2 and an odd number) groups of straight segments wound from a seamless steel pipe. The inlet and outlet of the yoke water pipe extend radially outward from the middle of the stator frame and are respectively welded to the inlet / outlet water main pipes. The flow resistance between the slot water pipe and the yoke water pipe can be balanced by adjusting the diameter of the yoke water pipe, thereby ensuring that the cooling water pipe evenly removes heat from the stator.

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

[0011] The beneficial effects of the present invention are as follows:

[0012] 1. In the parallel cooling water system of the present invention, the notched water pipe components are evenly embedded in the stator teeth, and the yoke water pipes are evenly arranged on the stator yoke, close to the heat source. The cooling water can quickly remove the heat generated by the winding, and the heat dissipation efficiency is high;

[0013] 2. In the parallel cooling water system of the present invention, the slot water pipe assembly and the yoke water pipe are arranged in parallel. By adjusting the diameter of the yoke water pipe, the flow resistance between the slot water pipe and the yoke water pipe can be balanced to ensure that the cooling water channel evenly removes the stator heat;

[0014] 3. The parallel cooling water system of the present invention has only one set of external cooling water interfaces arranged in the middle of the stator frame, which saves space inside the motor, has a simple process, low engineering difficulty, few welding points on the cooling water pipes and no welding points inside the motor, and has high reliability. It can be widely used in high power density permanent magnet motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0016] Figure 2A two-dimensional layout sectional view of the present application;

[0017] Figure 3 A schematic diagram of the cooling water circuit of the present application;

[0018] Figure 4 A schematic diagram of the layout of the notch water pipe assembly of the present application;

[0019] Figure 5 A schematic diagram of the yoke water pipe of the present application;

[0020] Figure 6 A schematic diagram of the location of the notch water pipe assembly and 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 - parallel cooling water circuit system, 4a - notch water pipe assembly, 4b - yoke water pipe, 4c - transition water pipe, 4d - water inlet / outlet main pipe. DETAILED DESCRIPTION

[0022] The present application is 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 parallel cooling water circuit permanent magnet motor stator, comprising a stator frame 1, a stator core 2, a winding 3 and a parallel cooling water circuit system 4. The stator frame 1 is a cage-shaped frame with a water inlet / outlet main pipe 4d. The stator core 2 is made of stator lamination with an inner circle as the stator tooth 2b, an outer circle as the stator yoke 2a and an open slot in the yoke. The winding 3 is embedded in the stator tooth 2b, and the outer circle of the stator core 2 is welded with the inner circle of the stator frame 1. The parallel cooling water circuit system 4 comprises m (m is an even number) groups of notch water pipe assemblies 4a located in the stator tooth 2b, n (n is an even number) groups of yoke water pipes 4b embedded in the stator yoke 2a, a transition water pipe 4c connected to the notch water pipe assembly 4a at the end of the stator, and a water inlet / outlet main pipe 4d embedded and welded in the middle of the stator frame 1. The notch water pipe assembly 4a and the yoke water pipe 4b in the parallel cooling water circuit system 4 are connected in parallel (see Figure 3 ), the inlet and outlet of the notch water pipe assembly 4a are connected to the water inlet / outlet main pipe 4d through the transition water pipe 4c, and the inlet and outlet of the yoke water pipe 4b are directly connected to the water inlet / outlet main pipe 4d, and the cooling medium in the pipe is oil or water.

[0024] Referring to Figure 4 , Figure 5 and Figure 6As shown, the notch water pipe assembly 4a in the parallel cooling water system 4 is uniformly and oppositely embedded in the stator tooth portion 2b in a circumferential direction, the yoke water pipe 4b is uniformly embedded in the opening slot of the stator yoke portion 2a and welded to the stator core 2 when the core is laminated, the transition water pipe 4c is located at the end of the stator for connecting the notch water pipe assembly 4a and the inlet / outlet water main pipe 4d, and the inlet / outlet water main pipe 4d is annularly embedded and welded in the middle of the stator frame 1. The notch water pipe assembly 4a is composed of k (k≥1) cooling water pipes, the cooling water pipe is wound by 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 2b, and the arc line portion is located at the end of the stator, the water pipes are not crossed, and the inlet and outlet of a single cooling water pipe are welded to the transition water pipe 4c at the same end. The yoke water pipe 4b is a continuous bending water pipe composed of n (n>2) and odd number of straight line segments wound by a seamless steel pipe, the inlet and outlet of the yoke water pipe 4b are radially outwardly extended in the middle of the stator frame 1 and welded to the inlet / outlet water main pipe 4d, respectively, the flow resistance between the notch water pipe 4a and the yoke water pipe 4b can be balanced by adjusting the diameter of the yoke water pipe 4b, and the cooling water path is uniformly used to take away the heat of the stator.

[0025] Further, the notch water pipe assembly 4a, the yoke water pipe 4b, the transition water pipe 4c and the inlet / outlet water main pipe 4d 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 thereto, the protection scope of the present application is not limited thereto, any changes or replacements easily thought of by those skilled in the art within the scope disclosed by the present application 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 parallel 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 stator punching sheets with inner circles forming stator teeth (2b), outer circles forming stator yokes (2a) and open slots. The winding (3) is located on the stator teeth (2b). The outer circle of the stator core (2) is welded to the inner circle of the stator frame (1). The stator core (2) also includes a parallel cooling water system (4). The parallel cooling water system (4) includes m groups of slotted water pipe assemblies (4a) located on the stator teeth (2b) and n groups of yoke water pipes (4b) embedded in the stator yokes (2a). , a transition water pipe (4c) located at the end of the stator and connected to the slot water pipe assembly (4a), and an inlet / outlet water main pipe (4d) welded in the middle of the stator frame (1), m and n are even numbers, the slot water pipe assembly (4a) and the yoke water pipe (4b) are connected in parallel, the inlet and outlet of the slot water pipe assembly (4a) are welded to the inlet / outlet water main pipe (4d) through the transition water pipe (4c), the inlet and outlet of the yoke water pipe (4b) are directly welded to the inlet / outlet water main pipe (4d), and the cooling medium in the pipe is oil or water.

2. The parallel cooling water circuit permanent magnet motor stator according to claim 1, characterized in that: The slotted water pipe assembly (4a) is evenly and alternately embedded in the stator tooth portion (2b) along the circumference, the yoke water pipe (4b) is evenly embedded in the open slot of the stator yoke portion (2a) and welded to the stator core (2), and the inlet / outlet water main pipe (4d) is annular.

3. The parallel cooling water circuit permanent magnet motor stator according to claim 2, characterized in that: The notched water pipe assembly (4a) is composed of k cooling water pipes, k≥1. 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 tooth portion (2b), and the arc portion is located at the stator end. The inlet and outlet of the cooling water pipe are welded to the transition water pipe (4c) at the same end.

4. The parallel cooling water circuit permanent magnet motor stator according to claim 2, characterized in that: The yoke water pipe (4b) is a continuously bent seamless steel pipe comprising n groups of straight segments, where n is greater than 2 and is an odd number. The inlet and outlet of the yoke water pipe (4b) extend radially outward from the middle of the stator frame (1).

5. A parallel cooling water channel permanent magnet motor stator according to any one of claims 1 to 4, characterized in that: The notched water pipe assembly (4a), the yoke water pipe (4b), the transition water pipe (4c), and the inlet / outlet water main pipe (4d) are square pipes or round pipes made of stainless steel, copper alloy, or titanium alloy.

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