Permanent magnet motor stator with series cooling water circuit

Abstract

The application discloses a permanent magnet motor stator with a series cooling water path, which comprises a stator frame, a stator core, a winding and a series cooling water path system. The stator frame is a cage-shaped frame with water inlet / outlet main pipes. The series cooling water path system comprises a slot water pipe assembly located at a stator tooth part, a yoke water pipe located at a stator yoke part, a water collecting pipe, a transition water pipe and the water inlet / outlet main pipes. The slot water pipe assembly, the yoke water pipe, the water collecting pipe, the transition water pipe and the water inlet / outlet main pipes are connected in series. The connection mode is welding. The application has the advantages of simple structure, stability and reliability. The series cooling water path system is close to a heat source, and has uniform cooling and good heat dissipation effect. The application can be widely applied to high-power-density permanent magnet motors.

Description

TECHNICAL FIELD

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

[0002] In order to improve performance indexes such as power density, a high-performance permanent magnet motor must adopt a high electric load and a high magnetic load, and the motor thermal load and copper consumption also increase. If the heat generated by the motor stator cannot be quickly discharged, the temperature of key components such as motor windings and rotor permanent magnets will 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 a core yoke pipe water cooling or a slot pipe water cooling or a 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 easy corrosion of the water channel 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 permanent magnet motor stator with a 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 a series cooling water path, 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 stator punching laminations with an inner circle provided with a stator tooth part and an outer circle provided with a stator yoke part, the stator yoke part is provided with an opening or an open slot, the winding is located in the stator tooth part, and the outer circle of the stator core and the inner circle of the stator base 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 opening water pipe assemblies located in the stator tooth part, a yoke water pipe located in the stator yoke part, an inlet / outlet water collecting pipe, a transition water pipe and an inlet / outlet water main pipe, the slot opening water pipe assemblies, the yoke water pipe, the inlet / outlet water collecting pipe, the transition water pipe and the inlet / outlet water main pipe in the series cooling water path system are connected in series, the connection mode is welding, the medium in the pipes 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 opening water pipe assembly→the outlet water collecting pipe→the yoke water pipe→the transition water pipe→the outlet water main pipe; the inlet water main pipe→the transition water pipe→the yoke water pipe→the inlet water collecting pipe→the slot opening water pipe assembly→the outlet water main pipe.

[0007] The slot water pipe assembly of the permanent magnet motor stator with the series cooling water path is embedded in the stator tooth portion in a uniform and reverse phase-to-phase manner along the circumference, the yoke water pipe and the transition water pipe are uniformly arranged in the stator yoke portion in a one-to-one correspondence, the number of the yoke water pipe is freely set, the cooling effect of the stator yoke portion can be fully ensured, and the inlet / outlet water collecting pipes are annular and arranged at the stator end portion.

[0008] The slot water pipe assembly of the permanent magnet motor stator with the series cooling water path is embedded in the stator tooth portion in a uniform and reverse phase-to-phase manner along the circumference, the yoke water pipe and the transition water pipe are uniformly arranged in the stator yoke portion in a one-to-one correspondence, the number of the yoke water pipe is freely set, the cooling effect of the stator yoke portion can be fully ensured, and the inlet / outlet water collecting pipes are annular and arranged at the stator end portion.

[0009] The slot water pipe assembly of the permanent magnet motor stator with the series cooling water path is embedded in the stator tooth portion in a uniform and reverse phase-to-phase manner along the circumference, the yoke water pipe and the transition water pipe are uniformly arranged in the stator yoke portion in a one-to-one correspondence, the number of the yoke water pipe is freely set, the cooling effect of the stator yoke portion can be fully ensured, and the inlet / outlet water collecting pipes are annular and arranged at the stator end portion.

[0010] The slot water pipe assembly of the permanent magnet motor stator with the series cooling water path is embedded in the stator tooth portion in a uniform and reverse phase-to-phase manner along the circumference, the yoke water pipe and the transition water pipe are uniformly arranged in the stator yoke portion in a one-to-one correspondence, the number of the yoke water pipe is freely set, the cooling effect of the stator yoke portion can be fully ensured, and the inlet / outlet water collecting pipes are annular and arranged at the stator end portion.

[0011] The slot water pipe assembly of the permanent magnet motor stator with the series cooling water path is embedded in the stator tooth portion in a uniform and reverse phase-to-phase manner along the circumference, the yoke water pipe and the transition water pipe are uniformly arranged in the stator yoke portion in a one-to-one correspondence, the number of the yoke water pipe is freely set, the cooling effect of the stator yoke portion can be fully ensured, and the inlet / outlet water collecting pipes are annular and arranged at the stator end portion.

[0012] 1, the slot water pipe assembly of the series cooling water path system is uniformly embedded in the stator tooth portion, the yoke water pipe is uniformly arranged in the stator yoke portion, the cooling water pipe is close to the heat source, the cooling efficiency is high, not only can effectively cool the stator yoke portion, but also can block the transmission of the stator heat to the rotor;

[0013] 2, the slot water pipe assembly, the yoke water pipe, the inlet / outlet water collecting pipe, the transition water pipe and the inlet / outlet water main pipe in the series cooling water path system are arranged in series, without flow resistance matching, the cooling water pipe can uniformly take away the heat;

[0014] 3, the series cooling water path system only has one water path, only needs one set of external cooling water interface, the process is simple, the end space is saved, the motor cooling water pipe has fewer welding points, and the reliability is high, and the series cooling water path system can be widely applied to high-power-density permanent magnet motors. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the main structure section view of the application;

[0016] Figure 2 It is the three-dimensional layout schematic view of the application;

[0017] Figure 3 It is the cooling water circuit schematic view of the 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] 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 - inlet / outlet water collecting pipe, 4d - transition water pipe, 4e - inlet / outlet water main pipe. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings and examples.

[0022] Referring to Figure 1 , Figure 2 and Figure 3 , the present application discloses a series cooling water circuit permanent magnet motor stator, comprising 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 with inlet / outlet water main pipe 4e welded by circumferential ring plate and axial rib plate, the stator core 2 is formed by stacking stator punching sheets with inner circle as stator tooth 2b and outer circle as stator yoke 2a, the stator yoke 2a is provided with openings or open slots, the stator tooth 2b is 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 integral body for torque transmission; the series cooling water circuit system 4 comprises m (m is an even number) groups of slot water pipe assemblies 4a located at the stator tooth 2b, yoke water pipes 4b located at the stator yoke 2a, inlet / outlet water collecting pipes 4c, transition water pipes 4d and inlet / outlet water main pipes 4e, the slot water pipe assemblies 4a, the yoke water pipes 4b, the inlet / outlet water collecting pipes 4c, the transition water pipes 4d and the inlet / outlet water main pipes 4e in the series cooling water circuit system 4 are connected in series, the connection mode is welding, the medium in the pipes is oil or water, and the medium in the series cooling water circuit system 4 has two circulation paths (see Figure 3 ): inlet water main pipe→slot water pipe assembly 4a→outlet water collecting pipe→yoke water pipe 4b→transition water pipe 4d→outlet water main pipe; inlet water main pipe→transition water pipe 4d→yoke water pipe 4b→inlet water collecting pipe→slot water pipe assembly 4a→outlet water main pipe.

[0023] Referring to Figure 4 , Figure 5As 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 and the transition water pipe 4d are uniformly arranged in the stator yoke portion 2a, the number of the yoke water pipe 4b is freely set, and the cooling effect of the stator yoke portion can be fully ensured, and the inlet / outlet water collecting pipe 4c is annular and arranged at the stator end portion. The notch water pipe assembly 4a is composed of n (n≥1) cooling water pipes, the cooling water pipe is composed of 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 stator end portion, the water pipes are not crossed, and the inlet and outlet of a single cooling water pipe are connected to the inlet / outlet water main pipe 4e and the inlet / outlet water collecting pipe 4c at the same end. The yoke water pipe 4b is a straight pipe passing through the stator yoke portion 2a, one end of which is connected to the transition water pipe 4d, and the other end is connected to the inlet / outlet water collecting pipe 4c. The notch water pipe assembly 4a, the yoke water pipe 4b, the inlet / outlet water collecting pipe 4c, the transition water pipe 4d and the inlet / outlet water main pipe 4e are square pipes or round pipes made of stainless steel, copper alloy or titanium alloy.

[0024] 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 permanent magnet motor stator with a series cooling water circuit, comprising a stator frame (1), a stator core (2) and a winding (3), wherein the stator frame (1) is a cage-shaped frame, and is characterized in that: The stator core (2) is formed by laminating stator punchings with an inner circle forming a stator tooth portion (2b) and an outer circle forming a stator yoke portion (2a). The stator yoke portion (2a) is provided with an opening or an open slot. The winding (3) is located on the stator tooth portion (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 series cooling water system (4). The series cooling water system (4) includes m groups of slotted water pipe assemblies (4a) located on the stator tooth portion (2b), yoke water pipes (4b) located on the stator yoke portion (2a), inlet / outlet water collecting pipes (4c), transition water pipes (4d) and inlet / outlet water main pipes (4e). The slotted water pipe assemblies (4a), yoke water pipes (4b), inlet / outlet water collecting pipes (4c), transition water pipes (4d) and inlet / outlet water main pipes (4e) are connected to the stator core (2). The slotted water pipe assembly (4a) is uniformly and alternately embedded in the stator teeth (2b) along the circumference, the number of the yoke water pipes (4b) and the transition water pipes (4d) is the same, and the inlet / outlet water collecting pipe (4c) is arranged in a ring at the end of the stator; the slotted water pipe assembly (4a) is composed of n cooling water pipes, n ≥ 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 respectively connected to the inlet / outlet water main pipe (4e) and the inlet / outlet water collecting pipe (4c) at the same end; the yoke water pipe (4b) is a straight pipe passing through the stator yoke (2a), one end of which is connected to the transition water pipe (4d) and the other end of which is connected to the inlet / outlet water collecting pipe (4c).

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

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