Salient-pole generator allowing for enhancement of cooling of pole coils

Abstract

The present invention relates to the technical field of generators, and in particular to a salient-pole generator allowing for enhancement of cooling of pole coils. In the generator of the present invention, an air guide device is provided between poles of every two adjacent pole coils; the air guide device comprises an outer edge circumferential double-sided plate, a central radial plate, and an inner circumferential semi-extension plate which are sequentially arranged and form a whole; the outer edge circumferential double-sided plate is separately connected to the outer edges of rotor cores on two sides; the inner circumferential semi-extension plate is arranged between the inner edge of the leeward side of a pole coil and a stator core and serves as an insulating supporting plate; an air inlet is formed between the central radial plate and an insulating supporting plate at the inner edge of the windward side of the adjacent pole coil; an air outlet is formed in the leeward section of the outer edge circumferential double-sided plate; an insulating plate used for supporting is provided between every two adjacent wire turns of each pole coil; and inter-turn air channels are formed between the insulating plate and the wire turns on two sides. The present invention provides a salient-pole generator allowing for enhancement of cooling of pole coils that is capable of fully using the rotor dynamic pressure energy and greatly increasing the heat dissipation area of the pole coils.

Description

A salient pole generator with enhanced cooling of magnetic pole coils Technical Field

[0001] The present invention belongs to the technical field of generators, and in particular relates to a salient pole generator with enhanced cooling of magnetic pole coils. Background Art

[0002] The pole coils of large motors are typically wound with multiple turns of copper wire. Current flowing through them generates significant ohmic losses, causing the coils to heat up and reach a high temperature. Compared to the stator coils, the high-speed, high-capacity rotors are very compact, leaving the coils with a small effective heat dissipation area. This results in elevated pole coil temperatures and uneven temperature distribution.

[0003] To maintain structural simplicity and reliability, salient-pole synchronous motors typically employ surface cooling for the pole coils. This involves allowing air flowing between the poles to blow across the outer surface of the poles, removing the associated losses and controlling the temperature rise of the pole coils. However, this structure suffers from low air utilization and poor cooling effectiveness. With the increasing speed and capacity of motors, employing improved cooling structures to enhance pole coil cooling has become crucial and even crucial to the success of product development.

[0004] To further enhance the cooling of the pole windings while maintaining a largely unchanged overall ventilation structure, several designers have developed improved cooling structures for the pole coils. These improvements primarily involve creating special air paths or increasing the coil's heat dissipation area. For example, Patent 201620476391.9, "Internal Cooling Air Guide for Salient Pole Motor Pole Coils," discloses a novel heat dissipation structure. This patent enhances the cooling of the pole coils by providing air guides within the yoke ventilation ducts, separating the air paths for cooling gas entering the pole coils and between the poles.

[0005] Patent 201621467353.3 - A Combined Internal and External Cooling Structure for Rotor Pole Windings discloses a novel heat dissipation structure comprising a pole coil. The pole coil is constructed from multiple layers of stacked current-carrying bars. The bars on the axial sides of the pole coil are provided with longitudinal current channels. The bars with longitudinal current channels are arranged adjacent to each other or spaced apart. This structure also reduces the temperature rise of the pole coil.

[0006] Although the above structures can improve the heat dissipation effect of the pole coil, they all drive air circulation by utilizing the radial pressure generated by the rotation of the rotor, and the increase in the heat dissipation area of ​​the pole coil is limited. The improvement in the cooling effect is not obvious enough and cannot adapt well to the trend of further high speed and large capacity of the motor.

[0007] Research shows that the linear speed of the pole coil of a large salient pole motor can be close to 120m / s, which can generate a dynamic pressure of nearly 8000Pa. If the structure can be designed to fully utilize the dynamic pressure energy and significantly increase the heat dissipation area of ​​the pole coil, the temperature of the coil can be significantly reduced.

[0008] Summary of the Invention

[0009] In order to solve the above problems existing in the prior art, the object of the present invention is to provide a salient pole generator with enhanced cooling of the pole coils, which fully utilizes the kinetic pressure energy of the rotor rotation and can significantly increase the heat dissipation area of ​​the pole coils.

[0010] The technical solution adopted in the present invention is:

[0011] A salient pole generator with enhanced cooling of a pole coil comprises a rotor yoke, a rotor core connected to the rotor yoke, a pole coil wound on the rotor core, and insulating support plates arranged between the two ends of the pole coil and the rotor core; an air guide device is arranged between the poles of two adjacent pole coils, the air guide device comprises an outer edge circumferential double-side plate, a center radial plate and an inner circumferential semi-extended plate which are arranged in sequence and form a whole, the outer edge circumferential double-side plates are respectively connected to the outer edges of the rotor cores on both sides, the inner circumferential semi-extended plate is arranged between the inner edge of the leeward side of the pole coil and the stator core and acts as an insulating support plate, an air inlet is formed between the center radial plate and the insulating support plate at the inner edge of the windward side of the pole coil, and an air outlet is arranged on the leeward section of the outer edge circumferential double-side plate; an insulating plate for support is arranged between two adjacent turns of the pole coil, and an inter-turn air duct is formed between the insulating plate and the turns on both sides.

[0012] In this invention, the inner circumferential semi-extended plates are placed only on the leeward side of the pole coils and in contact with the rotor core. The inlet on the windward side of the rotor interpole is open. As the motor rotates, the combined effects of radial pressure and tangential dynamic pressure cause air to flow sequentially through the yoke air duct, the windward area of ​​the rotor interpole, the windward side of the pole coils, the rotor core, the leeward side of the pole coils, the leeward area of ​​the rotor interpole, and the outlets on the outer circumferential plates. This invention leverages the radial pressure and circumferential dynamic pressure of the rotating rotor to direct air flow along a defined path, ensuring sufficient and uniform cooling of the pole coils and rotor core.

[0013] Adjacent turns of the pole coil are supported by insulating plates of a defined thickness, creating a 3mm to 5mm overhead air duct, significantly increasing the heat dissipation area of ​​the coil surface. This invention utilizes a unique air guide structure and inter-turn air ducts within the pole coil, combined with the tangential air ducts within the rotor core, to create a unique enhanced cooling structure that fully utilizes both the radial and tangential dynamic pressures generated by rotor rotation, reducing the pole coil temperature rise by over 30K.

[0014] As a preferred embodiment of the present invention, a wedge-shaped notch is provided in the inner circumferential semi-extended plate near the rotor core, and part of the air enters the leeward side of the magnetic pole coil from the wedge-shaped notch, so that the end of the area between the leeward side of the magnetic pole coil and the rotor core can also be fully cooled, thereby avoiding the formation of an airflow dead zone.

[0015] As a preferred embodiment of the present invention, an arc-shaped windshield is arranged near the inner edge of the magnetic pole coil turns. The arc-shaped windshield can improve the pressure and speed of the airflow entering the leeward side of the magnetic pole coil from the wedge-shaped gap, thereby improving the uniformity of wind speed distribution.

[0016] As a preferred solution of the present invention, the inner circumferential semi-extended plate is provided with ventilation holes near the central radial plate, so that the inner side of the area between the leeward side of the magnetic pole coil and the central radial plate can also be fully cooled, avoiding the formation of airflow dead zones, and further improving the cooling effect on the leeward side of the magnetic pole coil.

[0017] As a preferred solution of the present invention, the rotor yoke is formed by staggered stacking of a plurality of thin steel plates.

[0018] As a preferred solution of the present invention, the rotor core is formed by stacking a number of punching sheets, which are connected as a whole by a tightening screw passing through the axial holes of the punching sheets.

[0019] As a preferred solution of the present invention, the rotor core and the rotor yoke are connected via a T-shaped dovetail structure.

[0020] As a preferred embodiment of the present invention, the width of the tangential air duct of the magnetic pole coil is 3 mm to 5 mm.

[0021] As a preferred solution of the present invention, an air flow space for air flow is reserved between the magnetic pole coil and the rotor core.

[0022] As a preferred embodiment of the present invention, the rotor core is provided with core tangential air ducts. The rotor core is formed by stacking three different specifications of punching sheets, including a whole punching sheet, an upper half punching sheet, and a lower half punching sheet. When a plurality of upper half punching sheets and lower half punching sheets are stacked, a certain number of core tangential air ducts are formed in the axial direction.

[0023] The beneficial effects of the present invention are:

[0024] This invention fully utilizes the radial pressure and circumferential dynamic pressure of the rotating rotor, directing air flow along a defined path to ensure adequate and uniform cooling of the pole coils and rotor core. Adjacent turns of the pole coils are supported by insulating plates of a defined thickness, forming an overhead air duct that significantly increases the heat dissipation area of ​​the coil surface. By combining a unique air guide structure and tangential air ducts for the pole coils with those for the rotor core, this invention creates a unique enhanced cooling structure that fully utilizes both the radial pressure and tangential dynamic pressure generated by rotor rotation, reducing the temperature rise of the pole coils by over 30K. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic structural diagram of the present invention;

[0026] FIG2 is a partial enlarged view of point A in FIG1 .

[0027] In the figure: 1-rotor yoke; 2-rotor core; 3-insulating support plate; 4-pole coil; 5-air guide device; 11-yoke radial air duct; 21-T-type dove tail structure; 22-air flow space; 23-core tangential air duct; 41-inter-turn air duct; 42-arc-shaped wind shield; 51-outer edge circumferential double side plates; 52-center radial plate; 53-inner circumferential semi-extended plate; 54-air inlet; 55-air outlet; 56-wedge-shaped notch; 57-ventilation hole. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features therein may be combined with each other unless there is a conflict.

[0030] As shown in FIG1 , the direction of the rotor indicated by the rotation direction arrow is defined as the windward side, and the other side thereof is defined as the leeward side.

[0031] As shown in Figures 1 and 2, the salient pole generator with enhanced cooling of the pole coils of this embodiment includes a rotor yoke 1, a rotor core 2 is connected to the rotor yoke 1, a pole coil 4 is wound on the rotor core 2, and an insulating support plate 3 is provided between the two ends of the pole coil 4 and the rotor core 2; an air guide device 5 is provided between the poles of two adjacent pole coils 4, and the air guide device 5 includes an outer circumferential double-side plate 51, a center radial plate 52 and an inner circumferential semi-extended plate 53 which are arranged in sequence and form an integral whole, and the outer circumferential double-side plates 51 are respectively connected to the rotor core 2 on both sides. The outer edge is connected, the inner circumferential semi-extended plate 53 is arranged between the inner edge of the leeward side of the pole coil 4 and the stator core and acts as an insulating support plate 3, and an air inlet 54 is formed between the central radial plate 52 and the insulating support plate 3 at the inner edge of the windward side of the pole coil 4. A plurality of air outlets 55 are axially arranged in the middle position of the leeward section of the outer circumferential double-sided plate 51. The shape of the air outlet 55 can be circular, square or other shapes; an insulating plate for support is arranged between two adjacent turns of the pole coil 4, and an inter-turn air duct 41 is formed between the insulating plate and the turns on both sides.

[0032] The rotor yoke 1 is constructed from a stack of thin steel plates of a defined thickness, forming radial yoke air ducts 11 of a defined width between the yokes. Similar to the rotor yoke 1, the rotor core 2 is also constructed from a stack of punchings of a defined thickness, connected by tensioning screws passing through the axial holes of the punchings to form a single unit. The rotor core 2 and rotor yoke 1 are connected as a single unit via a T-shaped dovetail structure 21.

[0033] Between adjacent turns of the magnetic pole coil 4, several insulating plates of a certain thickness are arranged axially. After support, bonding, and pressing, these plates ultimately form 3mm to 5mm wide tangential air ducts on the windward and leeward sides. This allows the entire heat dissipation surface of each copper turn to be exposed to the air. Compared to existing structures, this significantly increases the heat dissipation area and reduces coil temperature rise. An airflow space 22 is provided between the magnetic pole coil 4 and the rotor core 2 for air flow. The width of this airflow space 22 is designed to be 15mm to 25mm.

[0034] The rotor core 2 is provided with a core tangential air duct 23. The rotor core 2 is formed by stacking three different specifications of punching sheets, including a whole punching sheet, an upper half punching sheet, and a lower half punching sheet. When a plurality of upper half punching sheets and lower half punching sheets are stacked, a certain number of core tangential air ducts 23 are formed in the axial direction.

[0035] The inner circumferential semi-extended plate 53 of the present invention is arranged only on the leeward side of the magnetic pole coil 4 and contacts the rotor core 2, while the inlet on the windward side of the rotor interpole is open. As the motor rotates, under the combined effects of radial pressure and tangential dynamic pressure, air flows sequentially through the yoke air duct, the windward region of the rotor interpole, the windward interturn air duct 41, the airflow space 22 between the windward side of the magnetic pole coil 4 and the rotor core 2, the core tangential air duct 23, the leeward interturn air duct 41, the airflow space 22 between the leeward side of the magnetic pole coil 4 and the rotor core 2, the leeward region of the rotor interpole, and the air outlet 55 on the outer circumferential double-sided plate 51. The present invention fully utilizes the radial pressure and circumferential dynamic pressure of the rotor's rotation to direct air flow along a defined path, ensuring that the magnetic pole coil 4 and the rotor core 2 are adequately and evenly cooled.

[0036] Adjacent turns of the pole coil 4 are supported by insulating plates of a defined thickness, creating an overhead air duct 3mm to 5mm thick, significantly increasing the heat dissipation area of ​​the coil surface. The present invention utilizes a unique air guide 5 structure and tangential air ducts along the pole coil 4, in conjunction with the tangential air ducts along the rotor core 2, to form a unique enhanced cooling structure that fully utilizes both the radial pressure and tangential dynamic pressure generated by rotor rotation, reducing the temperature rise of the pole coil 4 by over 30K.

[0037] In the above basic solution, the airflow enters from the windward side of the pole coil 4 and flows out from the leeward side of the pole coil 4. Due to the heat absorption of the gas along the way, the temperature of the leeward side of the pole coil 4 will be higher than the temperature of the windward side of the pole coil 4.

[0038] Therefore, a plurality of wedge-shaped notches 56 are formed axially in the inner circumferential semi-extended plate 53 near the rotor core 2. Some air enters the leeward side of the pole coil 4 through the wedge-shaped notches 56, allowing the end portion of the region between the leeward side of the pole coil 4 and the rotor core 2 to be fully cooled, thereby preventing the formation of airflow dead zones.

[0039] Further research shows that due to the influence of concentrated small-area high-speed air inflow at the wedge-shaped notch 56, the wind speed distribution in the inter-turn air duct 41 on the leeward side of the magnetic pole coil 4 is extremely uneven, specifically, the inner diameter direction is small and the outer diameter direction is large.

[0040] To improve the uniformity of wind speed distribution, curved windshields 42 are placed near the inner edge of the pole coil 4 turns. This alters the pressure and velocity distribution at the inlet, typically the third to fifth turns from the inner diameter. This improved structure can reduce the temperature difference between the windward and leeward coils by 5K to 10K. The wedge-shaped notch 56 and curved windshield 42 reduce the temperature difference between the windward and leeward sides of the pole coil 4, effectively improving the wind speed uniformity of the leeward pole coil 4 turns.

[0041] In the radial ventilation structure of the motor, the main airflow can only flow from the inner edge to the outer edge of the pole interspace. However, the radial air inlet between the poles on the leeward side of the basic scheme is blocked. The area of ​​the wedge-shaped gap 56 in the improved scheme is relatively small, so the heat dissipation condition on the leeward side of the magnetic pole coil 4 is still poor.

[0042] A certain number of ventilation holes 57 are axially opened on the inner circumferential semi-extended plate 53 near the inter-pole position, so that the inner side of the area between the leeward side of the magnetic pole coil 4 and the central radial plate 52 can also be fully cooled, avoiding the formation of airflow dead zones and further improving the cooling effect on the leeward side of the magnetic pole coil 4.

[0043] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that falls within the scope defined by the claims of the present invention falls within the scope of protection of the present invention.

Claims

1. A salient pole generator with enhanced cooling of magnetic pole coils, comprising a rotor yoke (1), a rotor core (2) connected to the rotor yoke (1), a magnetic pole coil (4) wound around the rotor core (2), and insulating support plates (3) provided between the two ends of the magnetic pole coil (4) and the rotor core (2); characterized in that: An air guide device (5) is provided between the poles of two adjacent magnetic pole coils (4). The air guide device (5) comprises an outer circumferential double-side plate (51), a central radial plate (52) and an inner circumferential semi-extended plate (53) which are sequentially provided and form an integral whole. The outer circumferential double-side plate (51) is respectively connected to the outer edges of the rotor cores (2) on both sides. The inner circumferential semi-extended plate (53) is provided between the inner edge of the leeward side of the magnetic pole coil (4) and the stator core and serves as an insulating support plate (3). An air inlet (54) is formed between the central radial plate (52) and the insulating support plate (3) at the inner edge of the windward side of the magnetic pole coil (4). An air outlet (55) is provided on the leeward section of the outer circumferential double-side plate (51). An insulating plate for support is provided between two adjacent turns of the magnetic pole coil (4), and an inter-turn air duct (41) is formed between the insulating plate and the turns on both sides.

2. The salient pole generator with enhanced cooling of the pole coil according to claim 1, characterized in that: The inner circumferential semi-extended plate (53) is provided with a wedge-shaped notch (56) near the rotor core (2).

3. The salient pole generator with enhanced cooling of the pole coil according to claim 2, characterized in that: An arc-shaped windshield (42) is arranged at the position of the turns of the magnetic pole coil (4) close to the inner edge.

4. The salient pole generator with enhanced cooling of the pole coil according to claim 1, characterized in that: The inner circumferential semi-extended plate (53) is provided with a ventilation hole (57) near the central radial plate (52).

5. The salient pole generator with enhanced cooling of magnetic pole coils according to claim 1, characterized in that: The rotor yoke (1) is formed by staggered stacking of a plurality of thin steel plates.

6. The salient pole generator with enhanced cooling of magnetic pole coils according to claim 1, characterized in that: The rotor core (2) is formed by stacking a plurality of punching sheets, and is connected as a whole by a tightening screw through the axial holes of the punching sheets.

7. The salient pole generator with enhanced cooling of magnetic pole coils according to claim 1, characterized in that: The rotor core (2) and the rotor yoke (1) are connected via a T-shaped dovetail structure (21).

8. The salient pole generator with enhanced cooling of magnetic pole coils according to claim 1, characterized in that: The width of the inter-turn air duct (41) is 3 mm to 5 mm.

9. The salient pole generator with enhanced cooling of magnetic pole coils according to claim 1, characterized in that: An airflow space (22) for air flow is reserved between the magnetic pole coil (4) and the rotor core (2).

10. A salient pole generator with enhanced cooling of magnetic pole coils according to any one of claims 1 to 9, characterized in that: An iron core tangential air duct (23) is provided in the rotor iron core (2).

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