An integrated motor cooling structure and motor

Abstract

The present invention discloses an integrated motor cooling structure and motor. The cooling structure includes stator conductors disposed in stator slots of the stator. Each stator conductor has one end connected to a drive plate on one side of the stator, and the other end passes through the stator slots, bends toward the motor shaft axis at the center of the rotor, and converges and connects at one end of the motor shaft. A stator conductor coolant channel is formed within the stator conductor, and a motor shaft coolant channel is formed within the motor shaft. The stator conductor coolant channel and the motor shaft coolant channel are connected. The other end of the motor shaft is connected to a motor drive cooling unit via a cooling water pipe. The motor drive cooling unit has a motor drive cooling unit coolant channel within it. The cooling medium inlet of the stator conductor coolant channel and the cooling medium outlet of the motor drive cooling unit coolant channel are connected to the supply port and recovery port of the cooling medium circulation system, respectively. This structure improves the cooling effect of the motor and extends the service life of the motor.

Description

Technical Field

[0001] The present invention belongs to the field of motors, and in particular relates to an integrated motor cooling structure and a motor. Background Art

[0002] In recent years, high-speed motors have become a hot topic in motor research. Compared to traditional motors, high-speed motors offer advantages such as high power density, compact size, high efficiency, and high reliability. Furthermore, reluctance motors, which utilize magnetic field modulation principles, offer high torque density and a simple structure. Improving the speed of reluctance motors and designing compact high-speed motors are new development directions for high-speed motors.

[0003] However, high-speed motors face challenges during operation, such as high motor losses, heat dissipation difficulties, and excessive heat generation, due to their compact structure, severe current distortion, high harmonic content, and high motor speed. These issues are the primary limitations on further improving high-speed motor performance. Furthermore, if a high-speed motor utilizes an integrated motor-drive solution, both the motor and the motor controller generate heat during operation. Therefore, a well-designed motor heat dissipation system is required to ensure long-term, reliable operation of the motor and motor controller at a reasonable temperature. Currently, the most widely used cooling methods for high-speed motors are stator ventilation or liquid circulation forced cooling. Air cooling generally only effectively cools the stator, but not the windings on the air outlet side. Furthermore, the housing requires a well-designed water flow path. Therefore, designing an integrated, efficient cooling solution to ensure high-speed motors operate at a reasonable temperature is crucial. Summary of the Invention

[0004] In view of the above deficiencies in the prior art, the object of the present invention is to provide a motor cooling structure solution suitable for the integrated integration of a motor and a driver, thereby improving the motor cooling effect and extending the service life of the motor.

[0005] Another object of the present invention is to provide a motor having the above-mentioned integrated motor cooling structure, which can ensure that the motor operates at a reasonable temperature.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An integrated motor cooling structure includes a stator conductor;

[0008] The stator conductor is arranged in a stator slot of the stator;

[0009] One end of each stator conductor is connected to the drive plate on one side of the stator, and the other end of the stator conductor passes through the stator slot and bends toward the motor shaft center at the center of the rotor, and converges and connects at one end of the motor shaft;

[0010] A stator conductor coolant channel is formed inside the stator conductor, a motor shaft coolant channel is formed inside the motor shaft, and the stator conductor coolant channel is communicated with the motor shaft coolant channel;

[0011] The other end of the motor shaft is connected to the motor drive cooling unit through a cooling water pipe; the motor drive cooling unit has a motor drive cooling unit coolant channel inside; the cooling medium inlet of the stator conductor coolant channel and the cooling medium outlet of the motor drive cooling unit coolant channel are respectively connected to the supply port and the recovery port of the cooling medium circulation system.

[0012] Preferably, the stator conductor is a hollow conduit structure, and the interior is a stator conductor coolant channel; the stator conductor coolant channel includes a main channel and a plurality of convex auxiliary channels arranged along both sides of the main channel.

[0013] Preferably, the stator conductor coolant channel is a V-shaped structure.

[0014] Preferably, the inner and outer walls of the stator conductor are sprayed with rust-proof and insulating coatings.

[0015] Preferably, ground insulation paper needs to be laid in the stator slots.

[0016] Preferably, the cooling medium circulation system is connected in series with the motor and the motor driver.

[0017] Preferably, the coolant channel of the motor-driven cooling unit is arranged in a serpentine structure inside the motor-driven cooling unit.

[0018] Preferably, the medium in the stator conductor coolant channel is water.

[0019] A motor comprising a stator, a rotor and the integrated motor cooling structure;

[0020] The stator is sleeved outside the rotor and has a plurality of stator slots; the stator is sleeved outside the rotor and has a plurality of stator slots; one stator conductor is arranged in each stator slot.

[0021] The stator and rotor are both salient pole structures, and there is an air gap between the stator and the rotor.

[0022] Compared with the existing technology, it has the following advantages:

[0023] Compared with existing cooling solutions, this solution offers a simpler structure. It integrates the motor, motor drive, and cooling structure to meet motor cooling requirements. Stator conductors are provided, each connected to the motor shaft. The other end of the motor shaft is connected to the motor drive cooling unit via a cooling water pipe. Coolant flows through the stator conductors, then into the motor shaft, then into the motor drive cooling unit, and finally returns to the cooling system, forming a cooling water system loop. This structure provides timely water cooling for the motor, improving cooling efficiency while avoiding the need for exhaust vents in traditional designs. This reduces motor noise, extends the motor's service life, and ensures proper operation.

[0024] Furthermore, the stator conductor adopts a hollow conductor structure. The hollow conductor structure adopts a "F"-shaped design to increase the contact area between the coolant and the conductor, improving heat dissipation efficiency. The motor shaft adopts a hollow structure, and cooling water channels are set in the stator conductor, motor shaft, and motor driver cooling unit. The cooling water flows from the stator conductor to the motor shaft and finally into the motor driver cooling unit. This has high cooling efficiency and excellent cooling effect on all parts of the motor. The integrated design of the motor, motor drive, and cooling structure is based on the cooling requirements of the motor to ensure the normal operation of the motor.

[0025] Since the motor of the present invention has an integrated motor cooling structure, it is ensured that the motor operates at a reasonable temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional schematic diagram of the motor cooling structure;

[0027] Figure 2 It is a side view schematic diagram of the motor cooling structure;

[0028] Figure 3 This is a schematic diagram of the motor-driven cooling unit;

[0029] Figure 4 is a schematic diagram of the stator conductor;

[0030] Figure 5 Schematic diagram of cooling water channel;

[0031] Among them, 1. Stator; 2. Rotor; 3. Stator conductor; 4. Stator conductor coolant channel; 5. Motor shaft; 6. Motor shaft coolant channel; 7. Drive plate; 8. Motor drive cooling unit; 9. Cooling water pipeline; 10. Motor drive cooling unit coolant channel; 11. Anti-rust and insulation coating. DETAILED DESCRIPTION

[0032] like Figure 1 and Figure 2As shown, an integrated motor cooling structure of the present invention includes: The stator 1 adopts a winding structure similar to a semi-squirrel cage type. One stator conductor 3 is inserted into each stator slot, and each conductor is one phase; One end of all stator conductors 3 is connected to the drive board 7, and the other end bends towards the axis of the motor shaft 5 after passing through the stator 1, and converges and is fixedly connected at the motor shaft 5.

[0033] The stator conductor 3 adopts a hollow conduit design, serving as the coolant channel 4 for the stator conductor. A water medium with a high thermal conductivity, a relatively large relative density, and good heat dissipation ability is selected inside the hollow conduit for cooling. The heat generated by copper loss and additional loss in the stator conductor 3 is directly taken away by the coolant from the inside of the conductor.

[0034] Preferably, the hollow conduit adopted by the stator conductor 3 is as Figure 4 As shown, the hollow conduit structure of the stator conductor 3 includes a main channel and a plurality of convex auxiliary channels arranged on both sides of the main channel, and the overall shape is similar to a Chinese character '丰' (Feng). This design can increase the contact area between the coolant and the wire, and improve the heat dissipation efficiency.

[0035] Preferably, considering the requirements of rust prevention and insulation, the inner and outer walls of the conduit of the stator conductor 3 need to be sprayed with necessary rust prevention and insulation coatings 11, and ground insulation paper needs to be laid in the slot. Due to the high frequency of the motor current, the skin effect occurs in the stator conductor, and the increase in conductor resistance caused by the hollow conduit design is not obvious.

[0036] As [[ID=…]] Figure 5 shown, the motor shaft 5 adopts a hollow structure, serving as the coolant channel 6 for the motor shaft; After one end of the stator conductor 3 bends towards the axis of the motor shaft 5, it is connected at the motor shaft 5, and the coolant channel 4 of the stator conductor is connected to the coolant channel 6 of the motor shaft. Most of the rotor losses are taken away after heat exchange between the inner wall of the water channel inside the shaft and the cooling water.

[0037] The other end of the rotor shaft 5 passes through the cooling water pipe 9 and is connected to the motor drive cooling unit 8. The coolant flows out from the coolant channel 6 of the motor shaft and then enters the coolant channel 10 of the motor drive cooling unit, and the heat generated by the motor driver is taken away by the motor drive cooling unit 8.

[0038] The cooling system adopts a series connection method of the motor and the motor driver, that is, the coolant first flows through the stator conductor 3, then flows into the motor shaft 5, then flows into the motor driver cooling unit 8, and finally returns to the cooling system, forming a cooling water system cycle.

[0039] The cooling medium inlet and the cooling medium outlet are also respectively connected to the supply port and the recovery port of the cooling medium circulation system, realizing the recycling of the cooling medium and realizing a closed-loop circulation cooling system.

[0040] The present invention also provides a motor having the above-mentioned integrated motor cooling structure, comprising a stator 1, a rotor 2 and the above-mentioned integrated motor cooling structure;

[0041] The stator 1 is sleeved outside the rotor 2 and has a plurality of stator slots. The stator 1 is sleeved outside the rotor 2 and has a plurality of stator slots. One stator conductor 3 is provided in each stator slot.

[0042] Specifically, the stator 1 and the rotor 2 are both salient pole structures, and there is an air gap between the stator and the rotor.

[0043] It should be noted that the integrated motor cooling structure proposed in the present invention is applicable to various motors including but not limited to high-speed permanent magnet motors, DC bias vernier reluctance motors, and the like.

[0044] The above are only preferred embodiments of the present invention and are not limited to the scope of implementation of the present invention. Any equivalent changes and modifications made according to the content of the patent scope of the present invention should be within the technical scope of the present invention.

[0045] The embodiments of the present invention are merely illustrative of this patent and do not limit its scope of protection. Those skilled in the art may also make partial changes thereto, which are within the scope of protection of this patent as long as they do not exceed the spirit of this patent.

Claims

1. An integrated motor cooling structure, characterized in that: including a stator conductor (3); The stator conductor (3) is arranged in a stator slot of the stator (1); One end of each stator conductor (3) is connected to a drive plate (7) on one side of the stator (1), and the other end of the stator conductor (3) passes through the stator slot and bends toward the axis of the motor shaft (5) at the center of the rotor (2), and converges and connects at one end of the motor shaft (5); A stator conductor cooling liquid channel (4) is formed inside the stator conductor (3), a motor shaft cooling liquid channel (6) is formed inside the motor shaft (5), and the stator conductor cooling liquid channel (4) is in communication with the motor shaft cooling liquid channel (6); The other end of the motor shaft (5) is connected to the motor drive cooling unit (8) through a cooling water pipe (9); the motor drive cooling unit (8) has a motor drive cooling unit cooling liquid channel (10) inside; the cooling medium inlet of the stator conductor cooling liquid channel (4) and the cooling medium outlet of the motor drive cooling unit cooling liquid channel (10) are respectively connected to the supply port and the recovery port of the cooling medium circulation system; The cooling medium circulation system is connected in series with the motor and the motor driver: the coolant first flows through the stator conductor (3), then flows into the motor shaft (5), then flows into the motor driver cooling unit (8), and finally returns to the cooling system, forming a cooling water system circulation.

2. The integrated motor cooling structure according to claim 1, characterized in that: The stator conductor (3) is a hollow conduit structure, and the interior thereof is a stator conductor cooling liquid channel (4); the stator conductor cooling liquid channel (4) comprises a main channel and a plurality of convex auxiliary channels arranged along both sides of the main channel.

3. The integrated motor cooling structure according to claim 2, characterized in that: The stator conductor cooling liquid channel (4) is a V-shaped structure.

4. The integrated motor cooling structure according to claim 1, characterized in that: The inner and outer walls of the stator conductor (3) are sprayed with a rust-proof and insulating coating (11).

5. The integrated motor cooling structure according to claim 1, characterized in that: Ground insulation paper needs to be laid in the stator slots.

6. The integrated motor cooling structure according to claim 1, characterized in that: The motor drive cooling unit coolant channel (10) is arranged in a serpentine structure inside the motor drive cooling unit (8).

7. The integrated motor cooling structure according to claim 1, characterized in that: The medium in the stator conductor cooling liquid channel (4) is water.

8. A motor, characterized in that: Comprising a stator (1), a rotor (2) and an integrated motor cooling structure according to any one of claims 1 to 7; The stator (1) is sleeved outside the rotor (2), and the stator (1) has a plurality of stator slots; the stator (1) is sleeved outside the rotor (2), and the stator (1) has a plurality of stator slots; and one stator conductor (3) is arranged in each stator slot.

9. The motor according to claim 8, characterized in that: The stator (1) and the rotor (2) are both salient pole structures, and there is an air gap between the stator and the rotor.

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