A multi-channel water cooling system for brushless DC motors

Abstract

A multi-channel water-cooling system for a brushless DC motor comprises a motor body, which includes a housing and a stator assembly mounted within the housing. A circular liquid ring is mounted between the housing and the stator assembly, with both its water inlet and outlet connected to an external water tank. The outer surface of the circular liquid ring is provided with a plurality of circular water channels, each with an independent water inlet and outlet. This multi-channel heat dissipation system improves heat dissipation efficiency and effectively reduces motor temperature.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical manufacturing, and in particular relates to a multi-channel water-cooling and heat dissipation system for a brushless DC motor. Background Art

[0002] A permanent magnet brushless motor is a permanent magnet motor that uses electronic circuit commutation or current control. There are two types of permanent magnet brushless motors: sine wave drive and square wave drive. Sine wave drive permanent magnet motors are called permanent magnet AC servo motors, while square wave drive permanent magnet motors are called brushless DC motors. Due to their excellent performance, brushless DC motors are widely used in various electronic devices and appliances, such as tape recorders, record players, electric massagers, computer hard drives, optical drives, and various toys. They are also widely used in various industries, including automobiles, motorcycles, ships, aviation, and machinery.

[0003] For some lower-power brushless DC motors, they often don't generate much heat during operation, causing minimal damage to the motor. Therefore, there's often no cooling method. Alternatively, for higher-power brushless DC motors, heat dissipation is achieved by machining heat sink fins onto the outside of the motor housing to increase the heat dissipation area. For higher-power brushless DC motors, air cooling and liquid cooling are also used to further reduce the temperature of the motor body, thereby increasing the motor's service life and ensuring motor performance. Traditional liquid cooling involves adding cooling channels inside the motor housing, allowing cooling water to flow in. This water removes heat from the motor stator, thereby reducing the overall motor temperature. However, due to the limited cooling water inlet and the long distance the cooling channels need to travel to cover the entire motor, the motor's heat dissipation near the outlet is poor, resulting in uneven heat dissipation across the motor. Summary of the Invention

[0004] In order to solve the above problems existing in the current technology, the present invention provides a multi-channel water-cooling heat dissipation system for a brushless DC motor, which can effectively reduce the overall temperature of the motor, has strong heat dissipation capacity, high efficiency, easy maintenance and easy manufacturing.

[0005] The technical solution adopted in the present invention is:

[0006] A multi-channel water-cooling system for a brushless DC motor comprises a motor body, a housing, and a stator assembly mounted within the housing. The system is characterized by a circular liquid ring installed between the housing and the stator assembly, the water inlet and outlet of which are both connected to an external water tank. The outer surface of the circular liquid ring is provided with a plurality of circular water channels, each with an independent water inlet and outlet. This multi-channel heat dissipation system improves heat dissipation efficiency and effectively reduces motor temperature.

[0007] Furthermore, each water channel of the circular liquid circuit ring is blocked to form two semicircular water channels, and the water inlets and outlets of the two semicircular water channels are located on the same side. The present invention reduces the flow distance of the water channel and further improves the heat dissipation efficiency.

[0008] Furthermore, the top of the casing is provided with a water inlet corresponding one-to-one to the water inlet of the water channel, and the bottom of the casing is provided with a water return port corresponding one-to-one to the water outlet of the water channel.

[0009] Furthermore, the water outlet of the external water tank is connected to the water inlet of the casing in a one-to-one correspondence through a diverter pipe, and the water inlet of the external water tank is connected to the water return port of the casing in a one-to-one correspondence through a diverter pipe.

[0010] Furthermore, a water pump is provided between the water outlet of the external water tank and the inlet of the diversion pipe.

[0011] Furthermore, the axial length of the circular liquid circuit ring is the same as the length of the stator assembly, and the entire motor stator can be covered to reduce the temperature.

[0012] Furthermore, the outer surface of the housing is provided with a plurality of heat dissipation fins for assisting heat dissipation.

[0013] Furthermore, the motor body also includes a front cover and a rear cover installed on both sides of the casing, and a rotor assembly rotatably installed in the stator assembly.

[0014] Furthermore, both ends of the rotor assembly are rotatably connected to the front end cover and the casing through bearings.

[0015] Furthermore, a winding coil lead-out box is provided on the rear end cover.

[0016] The beneficial effects of the present invention are as follows: the heat dissipation water channel of the motor adopts a multi-channel heat dissipation method, which reduces the circulation distance of the water channel, improves the heat dissipation efficiency of the coolant, and can effectively reduce the temperature of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the explosion structure of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the circular liquid circuit ring of the present invention.

[0019] Figure 3 It is a structural schematic diagram of the casing of the present invention.

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the diverter pipe of the present invention.

[0021] In the figure: 1. Front cover fixing screw; 2. Front cover; 3. Sealing ring; 4. First bearing; 5. Rotor assembly; 6. Stator assembly; 7. Circular liquid ring; 71. Water channel; 8. Casing; 81. Water inlet; 82. Water return port; 83. Heat sink fin; 9. Second bearing; 10. Winding coil lead-out box; 11. Rear cover fixing screw. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all possible alternatives, improvements and equivalents within the scope of the claims.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more, unless otherwise clearly defined.

[0024] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0025] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0026] See also Figure 1-4 This embodiment provides a multi-channel water cooling system for a brushless DC motor, including a motor body, a circular liquid ring 7, and an external water tank (not shown in the figure).

[0027] The motor body described in this embodiment is the main experimental object of this heat dissipation system, an inductive brushless DC motor. The motor body includes a housing 8, a stator assembly 6 installed in the housing 8, a front cover 2 and a rear cover installed on both sides of the housing 8, and a rotor assembly 5 rotatably installed in the stator assembly 6. The front cover 2 is fixed to the end face of the housing 8 by a front cover fixing screw 1, and the rear cover is fixed to the other end face of the housing 8 by a rear cover fixing screw 11. One end of the rotor assembly 5 is rotatably connected to the front cover 2 via a first bearing 4. A sealing ring 3 is provided between the first bearing 4 and the front cover 2. The other end of the rotor assembly 5 is rotatably connected to the housing 8 via a second bearing 9. A winding coil lead-out box 10 is provided on the rear cover.

[0028] The circular liquid circuit ring 7 of this embodiment is installed between the housing 8 and the stator assembly 6. The water inlet and outlet of the circular liquid circuit ring 7 are both connected to the external water tank. The outer surface of the circular liquid circuit ring 7 is provided with a plurality of circular water channels 71, each of which is provided with an independent water inlet and outlet. The present invention provides multi-channel heat dissipation, improves heat dissipation efficiency, and effectively reduces the temperature of the motor. Each circular water channel 71 of the circular liquid circuit ring 7 is blocked to form two semicircular water channels, with the water inlet and outlet of the two semicircular water channels located on the same side. The present invention reduces the circulation distance of the water channel and further improves the heat dissipation efficiency. Specifically, the circular liquid cooling ring 7 described in this embodiment is a cylindrical barrel-shaped structure. The circular liquid circuit ring 7 and the casing 8 cooperate with each other and are installed on the motor. The length of the circular liquid circuit ring 7 is the same as the length of the motor stator. Twelve water channels are opened on both sides around the circular liquid circuit ring 7, which can cover the entire motor stator. Each water channel is distributed vertically in a semicircle from top to bottom, which can effectively reduce the circulation distance of the water channel and improve the cooling efficiency.

[0029] The top of the housing 8 in this embodiment is provided with water inlets 81 corresponding one-to-one with the water inlets of the water channel 71, and the bottom of the housing 8 is provided with water return ports 82 corresponding one-to-one with the water outlets of the water channel 71. Specifically, in this embodiment, there are twelve pairs of water inlets 81 and water return ports 82 at the top and bottom of the housing 8, which can correspond to the circular liquid circuit ring 7.

[0030] In this embodiment, the water outlet of the external water tank is connected to the water inlet 81 of the housing 8 in a one-to-one correspondence via a diverter pipe. The water inlet of the external water tank is also connected to the water return port 82 of the housing 8 in a one-to-one correspondence via a diverter pipe. Specifically, the diverter pipe can divide the coolant into twelve branches, which are then delivered into the interior of the circular liquid circuit ring 7 through the water inlet 81 of the housing 8. A water pump is provided between the water outlet of the external water tank and the inlet of the diverter pipe.

[0031] In this embodiment, heat dissipation fins 83 are processed on the outside of the housing 8, which can cooperate with the internal liquid cooling to dissipate heat, increase the contact area between the motor and the outside world, and improve the heat dissipation intensity.

[0032] The circular liquid ring 7 described in the present invention serves as the primary circulation channel and carrier for the coolant. The housing 8 connects the circular liquid ring 7 to the external waterway. The diverter pipe diverts the water pumped from the pump and delivers it to the circular liquid ring 7. The coolant passes through the external water tank, where it is pumped out by the pump, diverted by the diverter pipe, and then delivered to the water inlet 81 on the housing 8. The water then enters the circular liquid ring 7, ultimately flowing out of the return port 82 on the housing 8 and back to the external water tank.

[0033] When the brushless DC motor water-cooling system of the present invention is in operation, coolant is stored in an external water tank. The pump is activated to extract the coolant and send it into a shunt pipe. The coolant passes through the shunt pipe and the shunt section, dividing it into twelve branches. These branches are then fed into the circular liquid circuit ring 7 through the water inlet 81 of the housing 8. The coolant then flows from the top of the motor to the bottom, removing heat from the motor. The coolant then flows out of the return port 82 at the bottom of the housing 8 and back into the external water tank. In the external water tank, the coolant is cooled and re-enters the next cycle. Simultaneously, the heat dissipation fins 83 on the housing 8 also assist in dissipating heat from the motor.

[0034] The present invention divides each heat dissipation water channel into multiple independent sub-water channels, covering the entire motor stator. Cooling water enters through the top of the motor and flows out from the bottom of the motor, which can effectively reduce the overall temperature of the motor, has strong heat dissipation capacity, high efficiency, easy maintenance and easy manufacturing.

Claims

1. A multi-channel water cooling system for a brushless DC motor, comprising a motor body, the motor body comprising a housing and a stator assembly mounted within the housing, characterized in that: A circular liquid circuit ring is installed between the housing and the stator assembly, and the water inlet and outlet of the circular liquid circuit ring are both connected to the external water tank; the outer surface of the circular liquid circuit ring is provided with a plurality of circular water channels, each of which is provided with an independent water inlet and outlet; Each water channel of the circular liquid circuit ring is blocked to form two semicircular water channels, the water inlets and outlets of the two semicircular water channels are located on the same side; each heat dissipation water channel is divided into multiple independent sub-water channels, covering the entire motor stator, and cooling water enters through the top of the motor and flows out from the bottom of the motor; The top of the housing is provided with a water inlet corresponding one-to-one to the water inlet of the water channel, and the bottom of the housing is provided with a water return port corresponding one-to-one to the water outlet of the water channel; The water outlet of the external water tank is connected to the water inlet of the casing in a one-to-one correspondence through a diverter pipe, and the water inlet of the external water tank is connected to the water return port of the casing in a one-to-one correspondence through a diverter pipe.

2. The multi-channel water cooling system for a brushless DC motor according to claim 1, characterized in that: A water pump is provided between the water outlet end of the external water tank and the inlet end of the diversion pipe.

3. The multi-channel water cooling system for a brushless DC motor according to claim 1, characterized in that: The axial length of the circular liquid circuit ring is the same as the length of the stator assembly.

4. The multi-channel water cooling system for a brushless DC motor according to claim 1, characterized in that: The outer surface of the housing is provided with a plurality of heat dissipation fins for assisting heat dissipation.

5. The multi-channel water cooling system for a brushless DC motor according to claim 1, characterized in that: The motor body further comprises a front end cover and a rear end cover mounted on both sides of the casing, and a rotor assembly rotatably mounted in the stator assembly.

6. The multi-channel water cooling system for a brushless DC motor according to claim 5, characterized in that: Both ends of the rotor assembly are rotatably connected to the front end cover and the casing through bearings.

7. The multi-channel water cooling system for a brushless DC motor according to claim 5, characterized in that: The rear end cover is provided with a winding coil lead-out box.

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