A cooling water channel applied to a flywheel energy storage inductor motor and a use method thereof

Abstract

The application discloses a cooling water channel applied to a flywheel energy storage induction sub-motor and a use method thereof, and comprises the cooling water channel; the cooling water channel has a water channel main body; the water channel main body has a water channel outer wall, a water channel inner wall, a water channel end plate and an inner wall water channel wall; the water channel outer wall, the water channel inner wall, the water channel end plate and the inner wall water channel wall constitute a cooling liquid flow channel area; the cooling water channel is additionally arranged on an excitation winding; and the cooling water channel is additionally provided with a water inlet and a water outlet. The cooling water channel has the advantages that assembly is simple and easy to realize, the heat dissipation capacity of the motor is strengthened without significantly increasing the original internal structure complexity of the motor, meanwhile, the outer surface of the cooling water channel is in contact with four most heat-producing parts, i.e. a stator core, a stator back iron, an excitation winding and an armature winding, so that the internal temperature of the motor is effectively reduced, and the reliability of the motor operation is improved.

Description

Technical Field

[0001] This invention relates to the field of mechanical manufacturing and motor cooling device technology, and more specifically, to a cooling water channel and its usage method applied to a flywheel energy storage induction motor. Background Technology

[0002] Currently, pulsed power technology is a key power supply technology for new weapons and modern equipment. It is characterized by slow charging with low power and short-term discharge with high power. Flywheel energy storage, as an inertial energy storage technology, has advantages such as long life, high efficiency, fast response, high energy density, and no pollution, and has good development prospects in the field of pulsed power supply.

[0003] Currently, flywheel energy storage motors mainly use permanent magnet motors, switched reluctance motors, and induction motors. Among them, permanent magnet motors have the advantages of high efficiency, high power density, and no need for external excitation, but they also have the problems of difficulty in adjusting excitation and demagnetization at high temperatures; switched reluctance motors have a simple and reliable structure and adjustable excitation, but their efficiency and power density are relatively low; the rotor of the induction motor is similar to that of a reluctance motor, but it uses stator excitation, which has the advantages of high rotor structural strength and adjustable excitation, making it very suitable for application in the field of flywheel energy storage.

[0004] To minimize the size and weight of flywheel energy storage motors and further improve their power and energy density, they typically operate at high speeds. However, the high frequency of current and magnetic field alternation in high-speed motors generates significant losses in the windings and core, which are converted into heat, causing internal temperatures to rise and leading to adverse consequences such as insulation failure and melting of potting and adhesive materials. This is particularly true for high-speed motors used in high-power pulse power supplies, whose short-duration operation, high-power discharge, and multi-cycle operation make them prone to severe heat accumulation, placing higher demands on their heat dissipation capabilities. Furthermore, the vacuum system typically used inside flywheel energy storage motors to reduce air resistance further diminishes their heat dissipation capacity, posing a significant challenge to thermal management. Therefore, it is necessary to employ special methods to enhance the cooling capacity of flywheel motors.

[0005] In summary, at least one of the following technical problems exists:

[0006] High-speed motors powered by high-power pulse power supplies are prone to severe heat buildup due to their short-duration operation, high-power discharge, and multi-cycle operation. Summary of the Invention

[0007] The main objective of this invention is to provide a cooling water channel for a flywheel energy storage induction motor, in order to solve the problem that high-speed motors with high-power pulse power supplies in the prior art are prone to severe heat accumulation due to their short-time operation, high-power discharge, and multi-cycle operation.

[0008] To achieve the above objectives, according to one aspect of the present invention, a cooling water channel for a flywheel energy storage induction motor is provided, comprising: a cooling water channel having a main body, the main body having an outer wall, an inner wall, an end plate, and an inner wall, the outer wall, the inner wall, the end plate, and the inner wall forming a coolant flow channel region, the cooling water channel being mounted on an excitation winding, and the cooling water channel also having an inlet and an outlet.

[0009] Preferably, the upper and lower ends of the coolant flow channel area are staggered U-shaped radial water channels, and the middle section is an axial water channel connecting the upper and lower radial water channels.

[0010] Preferably, the inlet and outlet of the cooling water channel are located at the bottom center of the U-shaped radial water channel, and the connecting line between the inlet and outlet divides the water channel into two radially symmetrical parts, left and right.

[0011] Preferably, the motor includes a rotor core, an armature winding, a stator core, an excitation winding, and a stator back iron. The stator core is divided into two sections, with a space in the middle for placing the excitation winding. The cooling water channel is located between the two sections of the stator core and shares the installation space with the excitation winding.

[0012] Preferably, the outer wall of the cooling water channel is in contact with the three sides of the excitation winding, the inner wall is in contact with the outer side of the armature winding, and the two end plates are in contact with the end faces of the two stator core sections.

[0013] Preferably, the coolant in the cooling water channel circulates in the following order: upward flow through the lower U-shaped radial channel and the axial channel, and downward flow through the upper U-shaped radial channel and the axial channel.

[0014] Preferably, the heat generated by losses in the armature winding, excitation winding and stator core of the motor is conducted into the cooling water channel wall through the contact surface. The coolant passes through the tortuous water channel, fully exchanges heat with the water channel wall, and flows out from the outlet to carry away the heat.

[0015] Preferably, the excitation winding and the cooling water channel form a circular integral structure, and the cooling water channel is circular with a C-shaped cross-section.

[0016] Preferably, the cooling water channel is a spiral water channel. After the coolant enters from the inlet, it moves forward in a spiral shape, passing through the outer circle of the upper disc, the inner circle of the upper disc, the middle cylinder, the inner circle of the lower disc, and the outer circle of the lower disc before flowing out from the outlet.

[0017] According to another aspect of the present invention, a method for using a cooling water channel in a flywheel energy storage induction motor is provided, comprising: coolant flowing in from the inlet, splitting into two branches on the left and right, and finally converging and flowing out at the outlet; the coolant circulating in the branches in the order of the lower U-shaped radial channel, the axial channel upward, the upper U-shaped radial channel, and the axial channel downward; the heat generated by the losses in the armature winding, the excitation winding and the stator core of the motor is conducted into the cooling water channel wall through the contact surface; the coolant passes through the cooling water channel, fully exchanges heat with the cooling water channel wall, and finally flows out from the outlet, carrying away the heat.

[0018] The technical solution of this invention has the following technical effects:

[0019] The assembly is simple and easy to implement, enhancing the motor's heat dissipation capacity without significantly increasing the complexity of the original internal structure. Simultaneously, the outer surface of this cooling channel comes into contact with the four most heat-generating components—the stator core, stator back iron, excitation winding, and armature winding—effectively reducing the internal temperature of the motor and improving its operational reliability. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A schematic diagram of the cooling water channel for a flywheel energy storage induction motor according to the present invention is shown;

[0022] Figure 2 It shows Figure 1 The diagram shows the internal coolant flow channel structure of the cooling water channel used in the flywheel energy storage induction motor.

[0023] Figure 3 It shows Figure 1 Exploded view of the cooling water channel structure used in the flywheel energy storage induction motor;

[0024] Figure 4 It shows Figure 1 The installation diagram of the cooling water channel for the flywheel energy storage induction motor and the structural diagram of the induction motor.

[0025] Figure 5 It shows Figure 1 The diagram showing the positional relationship between the stator core, excitation winding, and cooling water channel of the cooling water channel used in the flywheel energy storage induction motor.

[0026] Figure 6 It shows Figure 1A diagram showing the overall flow direction of the coolant in the cooling water channel used in the flywheel energy storage induction motor;

[0027] Figure 7 It shows Figure 1 Detailed diagram of the coolant flow path used in the cooling water channel of the flywheel energy storage induction motor;

[0028] Figure 8 It shows Figure 1 A two-dimensional schematic diagram of the coolant flow direction in the cooling water channel of the flywheel energy storage induction motor.

[0029] The above figures include the following reference numerals:

[0030] 1. Water channel body; 2. Water inlet; 3. Water outlet; 4. Coolant flow channel area; 5. Water channel outer wall; 6. Water channel inner wall; 7. Water channel end plate; 8. Inner water channel wall; 9. Rotor core; 10. Armature winding; 11. Stator core; 12. Excitation winding; 13. Stator back iron. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] like Figures 1 to 8 As shown, an embodiment of the present invention provides a cooling water channel for a flywheel energy storage induction motor, comprising: a cooling water channel having a water channel body 1, the water channel body 1 having an outer wall 5, an inner wall 6, an end plate 7, and an inner wall water channel 8, the outer wall 5, the inner wall 6, the end plate 7, and the inner wall water channel 8 forming a coolant flow channel region 4, the cooling water channel being installed on an excitation winding 12, and the cooling water channel also having an inlet 2 and an outlet 3.

[0033] Example 1

[0034] This embodiment addresses the cooling water channel of an inductor flywheel energy storage motor used in high-power pulse power supply applications. The aim is to improve the heat dissipation problem of high-power inductor flywheel energy storage motors by providing a cooling water channel. The cooling water channel comprises a main body 1, which has an outer wall 5, an inner wall 6, an end plate 7, and an inner channel wall 8. The outer wall 5, inner wall 6, end plate 7, and inner channel wall 8 constitute a coolant flow channel region 4. The excitation winding 12 forms a ring with the cooling water channel. The overall structure is circular, with a C-shaped cross-section for the cooling water channels. The upper and lower ends of the coolant flow channel area 4 are staggered U-shaped radial channels, while the middle section is an axial channel connecting the upper and lower radial channels. The cooling water channels also have inlets 2 and outlets 3, located at the center of the bottom of the U-shaped radial channels. The connecting line between inlets 2 and outlets 3 divides the channel into two radially symmetrical parts. The coolant flows through the lower U-shaped radial channels... The cooling water channel flows upwards, then downwards in the upper U-shaped radial channel, and finally downwards, in a cyclical pattern. The motor includes a rotor core 9, an armature winding 10, a stator core 11, an excitation winding 12, and a stator back iron 13. The stator core 11 is divided into two sections, with a space in the middle for the excitation winding 12. The cooling water channel is located between the two sections of the stator core 11, sharing the installation space with the excitation winding 12. The cooling water channel is installed on the excitation winding 12, and its outer wall 5 is in contact with the excitation winding 12 on three sides. The inner wall 6 of the water channel contacts the outer side of the armature winding 10, and the end plates 7 of the water channels on both sides contact the end faces of the two stator cores 11. The heat generated by the losses in the armature winding 10, the excitation winding 12 and the stator core 11 in the motor is conducted into the cooling water channel wall through the contact surface. The coolant passes through the tortuous water channel and fully exchanges heat with the water channel wall. It flows out from the outlet 3 and carries away the heat. By adding a circular cooling water channel around the excitation winding 12 of the induction flywheel motor, the heat dissipation capacity of the motor is enhanced.

[0035] In summary, the cooling water channel is circular with a C-shaped cross-section, comprising the main body 1, inlet 2, and outlet 3. The coolant flow area 4 within the main body 1 is defined by the outer wall 5, inner wall 6, end plate 7, and inner wall 8. The upper and lower ends are staggered U-shaped radial channels, while the middle section is an axial channel connecting the upper and lower radial channels. The inlet 2 and outlet 3 are located at the bottom center of the U-shaped radial channel, and the connecting line between inlet 2 and outlet 3 divides the channel into two radially symmetrical parts. The structure of a traditional same-pole induction motor can be divided into five parts: rotor core 9, armature winding 10, stator core 11, excitation winding 12, and stator back iron 13. The stator core 11 is divided into two sections, with a space in the middle for the excitation winding 12. The cooling water channel involved in this invention is located between the two stator core sections 11, sharing the installation space with the excitation winding 12. The outer wall 5 of the water channel contacts the excitation winding 12 on three sides, the inner wall 6 of the water channel contacts the outer side of the armature winding 10, and the end plates 7 of the water channel on both sides contact the end faces of the two stator core sections 11. At the same time, in order to install the water inlet 2 and outlet 3 of the water channel, it is necessary to make openings of the same size at corresponding positions on the original motor stator back iron 13.

[0036] Example 2

[0037] In another embodiment of the present invention, a method for using a cooling water channel in a flywheel energy storage induction motor is provided, comprising: coolant flowing in from inlet 2, splitting into two branches on the left and right, and finally converging and flowing out at outlet 3; the coolant circulating in the branches in the order of lower U-shaped radial channel, axial channel upward, upper U-shaped radial channel, axial channel downward; heat generated by losses in the armature winding 10, excitation winding 12 and stator core 11 of the motor is conducted into the cooling water channel wall through the contact surface; the coolant passes through the cooling water channel, fully exchanges heat with the cooling water channel wall, and finally flows out from outlet 3, carrying away the heat.

[0038] Example 3

[0039] Based on Example 1, the reciprocating water channel in the above technical solution is replaced with a spiral water channel, that is, after the coolant enters from the inlet 2, it moves forward in a spiral shape, passing through the outer circle of the upper disk, the inner circle of the upper disk, the middle cylinder, the inner circle of the lower disk, the outer circle of the lower disk, and finally flows out from the outlet 3.

[0040] Example 4

[0041] In the manufacturing process of this invention, the cooling water channel is divided into three parts, including the water channel body 1 and the two side water channel end plates 7. The two side water channel end plates 7 serve as the upper and lower walls of the water channel and are simple disc-shaped. The middle water channel body 1 includes all other structures of the cooling water channel, including the water channel outer wall 5, the water channel inner wall 6, and the inner wall water channel 8. After the three parts are machined separately using a machine tool, the two side end plates are attached to both sides of the water channel body 1, and then welded along the inner and outer circles to form a complete cooling water channel.

[0042] Example 5

[0043] The assembly process of the induction motor with cooling water channel involved in this invention is as follows: First, the excitation winding 12 is wound on the welded cooling water channel and potted with high thermal conductivity resin to form a ring-shaped whole with the excitation winding 12 and the cooling water channel. Then, the stator core 11, the cooling water channel, and the stator core 11 are installed into the stator back iron 13 in sequence using an interference fit. Note that the installation threaded holes of the water inlet 2 and water outlet 3 of the cooling water channel should be aligned with the pre-reserved openings on the stator back iron 13. Then, the armature winding 10 is installed inside the stator core 11 and potted as a whole with high thermal conductivity resin to complete the assembly of the stator part. Finally, the water inlet 2 and water outlet 3 are screwed into the cooling water channel through the opening of the back iron to complete the installation of the water inlet 2 and water outlet 3. At this point, the motor cooling water channel is installed.

[0044] Working principle:

[0045] During operation, the coolant flows in from inlet 2, splits into two branches (left and right), and finally converges at outlet 3 before flowing out. The coolant flows in the branches in a cyclical pattern: upward flow through the lower U-shaped radial channel and then the axial channel; downward flow through the upper U-shaped radial channel and then the axial channel. Alternatively, after entering from inlet 2, the coolant spirals forward, passing through the outer and inner circles of the upper disc, the middle cylinder, the inner and outer circles of the lower disc, and finally flows out from outlet 3. Heat generated by losses in the armature winding 10, excitation winding 12, and stator core 11 of the motor is conducted through the contact surface into the channel wall. The coolant, passing through the tortuous channel, exchanges heat thoroughly with the channel wall before finally flowing out from outlet 3, carrying away the heat.

[0046] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0047] The assembly is simple and easy to implement, enhancing the motor's heat dissipation capacity without significantly increasing the complexity of the original internal structure. At the same time, the outer surface of the cooling channel comes into contact with the four parts that generate the most heat: the stator core 11, the stator back iron 13, the excitation winding 12, and the armature winding 10, effectively reducing the internal temperature of the motor and improving the reliability of motor operation.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A cooling water channel for a flywheel energy storage induction motor, characterized in that, include: The cooling water channel has a main body, which includes an outer wall, an inner wall, an end plate, and an inner channel wall. The outer wall, inner wall, end plate, and inner channel wall constitute a coolant flow channel area. The cooling water channel is installed on the excitation winding and also has an inlet and an outlet. The motor includes a rotor core, armature winding, stator core, excitation winding, and stator back iron. The stator core is divided into two sections, with a space in the middle for the excitation winding. The cooling water channel is located between the two stator core sections, sharing the installation space with the excitation winding. The outer wall of the cooling water channel contacts the excitation winding on three sides, the inner wall contacts the outer side of the armature winding, and the end plates on both sides contact the end faces of the two stator core sections. The heat generated by losses in the armature winding, excitation winding, and stator core is conducted into the cooling water channel wall through the contact surface. The coolant passes through the tortuous water channel, fully exchanging heat with the water channel wall, and flows out from the outlet to carry away the heat. The excitation winding and the cooling water channel form a circular integral structure, and the cooling water channel is circular with a C-shaped cross-section.

2. The cooling water channel applied to the flywheel energy storage induction sub-motor as described in claim 1, characterized in that, The coolant flow channel area has U-shaped radial channels arranged in an alternating pattern at both the upper and lower ends, and an axial channel connecting the upper and lower radial channels in the middle section.

3. The cooling water channel applied to the flywheel energy storage induction motor as described in claim 1, characterized in that, The inlet and outlet of the cooling water channel are located at the bottom center of the U-shaped radial water channel, and the connecting line between the inlet and outlet divides the water channel into two radially symmetrical parts, left and right.

4. The cooling water channel applied to the flywheel energy storage induction sub-motor as described in claim 1, characterized in that, The coolant in the cooling water channel circulates in the following order: upward flow through the lower U-shaped radial channel and axial channel, and downward flow through the upper U-shaped radial channel and axial channel.

5. The cooling water channel applied to the flywheel energy storage induction sub-motor as described in claim 1, characterized in that, The cooling water channel is a spiral channel. After the coolant enters from the inlet, it moves forward in a spiral shape, passing through the outer circle of the upper disc, the inner circle of the upper disc, the middle cylinder, the inner circle of the lower disc, and the outer circle of the lower disc before flowing out from the outlet.

6. A method of using a cooling water channel for a flywheel energy storage induction motor, based on the cooling water channel for a flywheel energy storage induction motor as described in any one of claims 1-5, characterized in that, include: The coolant flows in from the inlet, splits into two branches on the left and right, and finally merges at the outlet. The coolant circulates in the branches in the order of the lower U-shaped radial channel, the axial channel upward, the upper U-shaped radial channel, and the axial channel downward. The heat generated by the losses in the armature winding, excitation winding and stator core of the motor is conducted into the cooling channel wall through the contact surface. The coolant passes through the cooling channel and fully exchanges heat with the cooling channel wall, and finally flows out from the outlet, carrying away the heat.

Images