Five-axis rotary table driven by liquid cooling permanent magnet synchronous motor

Abstract

According to the five-axis rotary table driven by the liquid cooling permanent magnet synchronous motor, a liquid cooling channel is formed between the inner side of the five-axis rotary table and the outer side of the permanent magnet synchronous motor, circulation is formed through the liquid cooling channel and an external heat exchanger through a pipeline, and one end of the liquid cooling channel takes away heat generated by the motor; the other end of the liquid cooling channel circulates the cooling liquid cooled by the heat exchanger to the outer side of the permanent magnet synchronous motor for continuous cooling, so that heat dissipation of the motor is facilitated; the liquid cooling channel is of a multi-layer parallel structure, the flow is large, the flow speed is high, liquid can be rapidly fed and discharged, and uniform and efficient heat dissipation is achieved; a temperature sensor is arranged in the enameled wire coil and used for transmitting temperature data in the coil to a machine tool control system and detecting the real-time temperature of the motor, and meanwhile the heat exchanger adjusts the temperature of input liquid according to the monitored temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of five-axis turntables, and more specifically, to a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor. Background Art

[0002] The five-axis cradle turntable is a type of CNC turntable and is a common component for machine tool processing. Among them, the axis rotating around the X-axis is defined as the A-axis, and the axis rotating around the Z-axis is defined as the C-axis. The five-axis cradle turntable clamps the parts to be processed on the C-axis workbench through the combination of the A-axis and the C-axis, and meets the needs of part processing through the linkage control of the five-axis system and the cutting of the tool. The current mainstream five-axis turntable is manufactured by servo motor driving the worm gear or the reduction wheel. The private servo motor of this type of turntable has low power and does not generate much heat. In addition, it does not directly drive the turntable workbench, but only drives the mechanical reduction mechanism, so it can be used without cooling. However, this mechanical turntable will produce mechanical wear while conducting, resulting in low precision of the turntable. Therefore, a higher-precision DD direct-drive turntable is required, and the low-power direct-drive five-axis turntable has low current, low torque, low heat, and can be used without water cooling. However, as the market demand for high-power direct-drive rotary tables arises, the temperature of large direct-drive motors will increase with the increase in power. If the temperature rise cannot be controlled, it will cause thermal elongation of materials and affect the machining accuracy of machine tools, or it will cause the coil to burn out and the machine will need to be overhauled. Therefore, the cooling of high-power five-axis rotary tables has become a technical problem that needs to be solved urgently.

[0003] The technology closest to the existing one is, Publication No.: CN208977279U, a workpiece clamping shaft liquid-cooled rare earth permanent magnet torque motor direct-driven turntable, the utility model discloses a workpiece clamping shaft liquid-cooled rare earth permanent magnet torque motor direct-driven turntable, comprising: a workpiece clamping shaft direct-driven turntable housing, a rare earth permanent magnet motor stator, a rare earth permanent magnet motor rotor, a transmission shaft and a dustproof component; the rare earth permanent magnet motor stator is fixedly mounted on the inner wall of the workpiece clamping shaft direct-driven turntable housing; the rare earth permanent magnet motor rotor is rotatably built into the workpiece clamping shaft direct-driven turntable housing; the middle part of the transmission shaft is fixedly connected to the rare earth permanent magnet motor rotor; the workpiece clamping shaft liquid-cooled rare earth permanent magnet torque motor direct-driven turntable directly drives the transmission shaft to rotate by the rare earth permanent magnet motor stator and rare earth permanent magnet motor rotor arranged therein.

[0004] The five-axis turntable is provided with a coolant flow groove to enclose and form the coolant flow cavity for cooling, but the liquid flow rate of the cooling flow cavity is low, and the liquid cannot be quickly and evenly inflow and outflow, the temperature cannot be reduced efficiently and evenly, and the real-time temperature of the motor cannot be monitored.

[0005] In view of this, the present invention proposes a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor, which can efficiently reduce the temperature and monitor the motor temperature in real time. Summary of the invention

[0006] The purpose of the present invention is to provide a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor, which can efficiently reduce the temperature and monitor the motor temperature in real time.

[0007] A five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor comprises a five-axis turntable 1, a permanent magnet synchronous motor 2 and a first liquid cooling channel 3, wherein the five-axis turntable 1 is provided with a permanent magnet synchronous motor 2 at the bottom, the permanent magnet synchronous motor 2 is used to drive the five-axis turntable 1 to rotate, a water jacket shell 9 is provided on the inner side of the outer shell of the five-axis turntable 1, the water jacket shell 9 is integrally formed with the five-axis turntable 1 or is detachably connected, a first liquid cooling channel 3 is formed between the inner side of the outer shell of the five-axis turntable 1 and the outer side of the permanent magnet synchronous motor 2, the first liquid cooling channel 3 forms a circulation through a pipeline and an external heat exchanger, one end of the first liquid cooling channel 3 takes away the heat generated by the permanent magnet synchronous motor 2, and the other end of the first liquid cooling channel 3 circulates the coolant cooled by the heat exchanger to the outer side of the permanent magnet synchronous motor 2 for continuous cooling.

[0008] In some embodiments, the permanent magnet synchronous motor 2 includes a stator coil water jacket 5, a motor silicon steel sheet 6, and a rotating shaft 7. The stator coil water jacket 5 is provided on the inner side of the five-axis turntable 1, and the outer side of the stator coil water jacket 5 and the inner side of the five-axis turntable 1 form a first liquid cooling channel 3. The other side of the stator coil water jacket 5 is provided with a motor silicon steel sheet 6 and wraps the largest outer circle of the motor silicon steel sheet 6. The inner circle tooth grooves of the motor silicon steel sheet 6 are wound with enameled wire coils, and a rotating shaft 7 is provided in the center surrounded by the enameled wire coils. The driving end of the rotating shaft 7 is connected to the turntable of the five-axis turntable 1, and a circle of permanent magnets 8 are inlaid on the axial direction of the outer diameter of the rotating shaft 7.

[0009] Furthermore, the first liquid cooling channel 3 is a spiral structure or a multi-layer parallel structure 4, and the multi-layer parallel structure 4 is more preferably used, which has a large flow rate and a high flow velocity.

[0010] In some embodiments, the multi-layer parallel structure 4 includes a plurality of baffles 41, and a plurality of baffles 41 are arranged in parallel and at intervals on the outer wall of the stator coil water jacket 5 or the inner side of the five-axis turntable 1 near the end of the stator coil water jacket 5, and a strip-shaped liquid cooling channel 42 is formed between adjacent baffles 41. The plurality of strip-shaped liquid cooling channels 42 are arranged in parallel, and a water outlet 43 is arranged between adjacent baffles 41. If a water outlet is provided on a baffle 41, another water outlet 43 is provided on the adjacent baffle 41 at 180 degrees opposite to the baffle 41. The heat exchanger outputs the liquid into the bottom strip-shaped liquid cooling channel 42, and finally reaches the top strip-shaped liquid cooling channel 42 and is discharged into the heat exchanger circulation.

[0011] Furthermore, adjacent water outlets 43 are arranged opposite to each other, wherein only one water outlet is arranged on the same side, so as to achieve the effect of uniform liquid inflow.

[0012] In some embodiments, the enameled wire coil between the inner side of the stator coil water jacket 5 and the inner circle of the motor silicon steel sheet 6 is potted with epoxy resin glue to prevent the enameled wire coil from current breakdown and waterproof and dustproof.

[0013] In some embodiments, a temperature sensor is provided inside the enameled wire coil, preferably at one-half of the inside of the enameled wire coil. The temperature sensor is used to transmit the temperature data inside the coil to the machine tool control system and detect the real-time temperature of the motor. At the same time, the heat exchanger adjusts the input liquid temperature according to the monitored temperature.

[0014] In some embodiments, a ring encoder is further provided at the bottom of the permanent magnet synchronous motor 2 for recording the number of rotations and the rotation speed of the permanent magnet synchronous motor 2 , and the ring encoder is one of a magnetic grating, a time grating, and a grating.

[0015] In some embodiments, the rotating shaft 7 of the permanent magnet synchronous motor 2 is an integrally formed structure or a split structure.

[0016] In some embodiments, at least one step is provided inside the stator coil water jacket 5 , and the end of the motor silicon steel sheet 6 abuts against the top of the step, which plays a role in height positioning when the motor silicon steel sheet 6 is installed.

[0017] In some embodiments, the water outlet 43 processed on the baffle 41 is in the shape of a square notch or a crescent-shaped notch that is tangent to the outer circle of the bottom of the strip-shaped liquid cooling channel 42 .

[0018] In some embodiments, a swing arm shaft 10 is also provided at one horizontal end of the five-axis turntable 1, and a swing arm drive motor 11 is provided on the side of the swing arm shaft 10. The swing arm shaft 10 and the swing arm drive motor 11 form a second liquid cooling channel. The structure of the second liquid cooling channel is consistent with the structure of the first liquid cooling channel 3, so that it can be quickly cooled down during driving, which is convenient for the heat dissipation of the swing arm drive motor 11.

[0019] Beneficial effects of the present invention: The present invention proposes a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor, a first liquid cooling channel 3 is formed on the inner side of the five-axis turntable 1 and the outer side of the permanent magnet synchronous motor 2, a circulation is formed through the first liquid cooling channel 3 through a pipeline and an external heat exchanger, one end of the first liquid cooling channel 3 takes away the heat generated by the motor, and the other end of the first liquid cooling channel 3 circulates the coolant cooled by the heat exchanger to the outside of the permanent magnet synchronous motor 2 for continuous cooling, which is convenient for the heat dissipation of the motor; the first liquid cooling channel 3 is a multi-layer parallel structure 4, with a large flow rate and a high flow rate, and can quickly carry out liquid inlet and outlet, and evenly and efficiently dissipate heat; a temperature sensor is provided in the enameled wire coil, and the temperature sensor transmits the temperature data in the coil to the machine tool control system to perform real-time temperature monitoring of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor according to the present application.

[0021] Figure 2 This is a top view of a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor according to the present application.

[0022] Figure 3 This is an AA cross-sectional view of a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor according to the present application.

[0023] Figure 4 This is a schematic structural diagram of a stator coil water jacket driven by a liquid-cooled permanent magnet synchronous motor according to the present application.

[0024] Figure 5 This is a top view of a stator coil water jacket driven by a liquid-cooled permanent magnet synchronous motor according to the present application.

[0025] Figure 6 This is a BB cross-sectional view of a stator coil water jacket driven by a liquid-cooled permanent magnet synchronous motor according to the present application.

[0026] Figure 7 This is a three-dimensional diagram of a stator coil water jacket driven by a liquid-cooled permanent magnet synchronous motor according to the present application.

[0027] Main component symbols

[0028] Five-axis turntable 1, permanent magnet synchronous motor 2, liquid cooling channel 3, multi-layer parallel structure 4, baffle 41, strip liquid cooling channel 42, water outlet 43, stator coil water jacket 5, motor silicon steel sheet 6, rotating shaft 7, permanent magnet 8, water jacket housing 9, swing arm shaft 10.

[0029] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0030] The following examples are described to assist the understanding of the present application, and the examples are not and should not be interpreted in any way as limiting the scope of protection of the present application.

[0031] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together (including within a single system or component).

[0032] At the same time, the connections between components or systems are not intended to be limited to direct connections, rather, the data between these components may be modified, reformatted, or otherwise changed by intermediate components. In addition, additional or fewer connections may be used. It should also be noted that the terms "coupled," "connected," or "input" should be understood to include direct connections, indirect connections through one or more intermediate devices, and wireless connections. Embodiment 1:

[0033] like Figure 1 As shown in FIG. 1 , it is a schematic diagram of the overall structure of a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor of the present application; Figure 2 , which is a top view of a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor of the present application; Figure 3 The figure shows an AA cross-sectional view of a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor according to the present application.

[0034] A five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor comprises a five-axis turntable 1, a permanent magnet synchronous motor 2 and a first liquid cooling channel 3, wherein the five-axis turntable 1 is provided with a permanent magnet synchronous motor 2 at the bottom, the permanent magnet synchronous motor 2 is used to drive the five-axis turntable 1 to rotate, a water jacket shell 9 is provided on the inner side of the outer shell of the five-axis turntable 1, the water jacket shell 9 is integrally formed with the five-axis turntable 1 or is detachably connected, a first liquid cooling channel 3 is formed between the inner side of the outer shell of the five-axis turntable 1 and the outer side of the permanent magnet synchronous motor 2, the first liquid cooling channel 3 forms a circulation through a pipeline and an external heat exchanger, one end of the first liquid cooling channel 3 takes away the heat generated by the permanent magnet synchronous motor 2, and the other end of the first liquid cooling channel 3 circulates the coolant cooled by the heat exchanger to the outer side of the permanent magnet synchronous motor 2 for continuous cooling.

[0035] The permanent magnet synchronous motor 2 includes a stator coil water jacket 5, a motor silicon steel sheet 6, and a rotating shaft 7. The stator coil water jacket 5 is provided on the inner side of the five-axis turntable 1, and the outer side of the stator coil water jacket 5 and the inner side of the five-axis turntable 1 form a first liquid cooling channel 3. The other side of the stator coil water jacket 5 is provided with a motor silicon steel sheet 6 and wraps the maximum outer circle of the motor silicon steel sheet 6. The inner circle tooth grooves of the motor silicon steel sheet 6 are wound with enameled wire coils, and the center surrounded by the enameled wire coils is provided with a rotating shaft 7. The driving end of the rotating shaft 7 is connected to the turntable of the five-axis turntable 1, and a circle of permanent magnets 8 are inlaid on the axial direction of the outer diameter of the rotating shaft 7.

[0036] The first liquid cooling channel 3 is a spiral structure.

[0037] The enameled wire coil between the inner side of the stator coil water jacket 5 and the inner circle of the motor silicon steel sheet 6 is potted with epoxy resin glue to prevent the enameled wire coil from current breakdown and waterproof and dustproof.

[0038] A temperature sensor is provided inside the enameled wire coil, which is used to transmit the temperature data inside the coil to the machine tool control system and detect the real-time temperature of the motor. At the same time, the heat exchanger adjusts the input liquid temperature according to the monitored temperature.

[0039] A ring encoder is also provided at the bottom of the permanent magnet synchronous motor 2 for recording the number of rotations and the rotation speed of the permanent magnet synchronous motor 2 . The ring encoder is one of a magnetic grating, a time grating and a grating.

[0040] The rotating shaft 7 of the permanent magnet synchronous motor 2 is one of an integrally formed structure and a split structure.

[0041] At least one step is provided inside the stator coil water jacket 5 , and the end of the motor silicon steel sheet 6 abuts against the top of the step, which plays a role in height positioning when the motor silicon steel sheet 6 is installed.

[0042] The water outlet 43 processed on the blocking strip 41 is in the shape of a square notch or a crescent-shaped notch that is tangent to the outer circle of the bottom of the strip-shaped liquid cooling channel 42 .

[0043] A swing arm shaft 10 is also provided at one horizontal end of the five-axis turntable 1, and a swing arm drive motor 11 is provided on the side of the swing arm shaft 10. The swing arm shaft 10 and the swing arm drive motor 11 form a second liquid cooling channel. The structure of the second liquid cooling channel is consistent with the structure of the first liquid cooling channel 3, so that it can be quickly cooled down during driving, which is convenient for the heat dissipation of the swing arm drive motor 11.

[0044] Embodiment 2:

[0045] like Figure 1 As shown in FIG. 1 , it is a schematic diagram of the overall structure of a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor of the present application; Figure 2 , which is a top view of a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor of the present application; Figure 3 As shown in FIG. , it is an AA cross-sectional view of a five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor of the present application; Figure 4 As shown in FIG. 1 , it is a schematic diagram of the structure of a stator coil water jacket driven by a liquid-cooled permanent magnet synchronous motor of the present application; Figure 5 As shown in FIG. 1 , it is a top view of a stator coil water jacket driven by a liquid-cooled permanent magnet synchronous motor of the present application; Figure 6 As shown, it is a BB cross-sectional view of a stator coil water jacket driven by a liquid-cooled permanent magnet synchronous motor of the present application; Figure 7 The figure shows a three-dimensional diagram of a stator coil water jacket driven by a liquid-cooled permanent magnet synchronous motor according to the present application.

[0046] A five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor comprises a five-axis turntable 1, a permanent magnet synchronous motor 2 and a first liquid cooling channel 3, wherein the five-axis turntable 1 is provided with a permanent magnet synchronous motor 2 at the bottom, the permanent magnet synchronous motor 2 is used to drive the five-axis turntable 1 to rotate, a water jacket shell 9 is provided on the inner side of the outer shell of the five-axis turntable 1, the water jacket shell 9 is integrally formed with the five-axis turntable 1 or is detachably connected, a first liquid cooling channel 3 is formed between the inner side of the outer shell of the five-axis turntable 1 and the outer side of the permanent magnet synchronous motor 2, the first liquid cooling channel 3 forms a circulation through a pipeline and an external heat exchanger, one end of the first liquid cooling channel 3 takes away the heat generated by the permanent magnet synchronous motor 2, and the other end of the first liquid cooling channel 3 circulates the coolant cooled by the heat exchanger to the outer side of the permanent magnet synchronous motor 2 for continuous cooling.

[0047] The permanent magnet synchronous motor 2 includes a stator coil water jacket 5, a motor silicon steel sheet 6, and a rotating shaft 7. The stator coil water jacket 5 is provided on the inner side of the five-axis turntable 1, and the outer side of the stator coil water jacket 5 and the inner side of the five-axis turntable 1 form a first liquid cooling channel 3. The other side of the stator coil water jacket 5 is provided with a motor silicon steel sheet 6 and wraps the maximum outer circle of the motor silicon steel sheet 6. The inner circle tooth grooves of the motor silicon steel sheet 6 are wound with enameled wire coils, and the center surrounded by the enameled wire coils is provided with a rotating shaft 7. The driving end of the rotating shaft 7 is connected to the turntable of the five-axis turntable 1, and a circle of permanent magnets 8 are inlaid on the axial direction of the outer diameter of the rotating shaft 7.

[0048] The first liquid cooling channel 3 is a multi-layer parallel structure 4 with a large flow rate and a high flow velocity.

[0049] The multi-layer parallel structure 4 includes a plurality of baffles 41. A plurality of baffles 41 are arranged in parallel and at intervals on the outer wall of the stator coil water jacket 5 or the inner side of the five-axis turntable 1 near the end of the stator coil water jacket 5. A strip-shaped liquid cooling channel 42 is formed between adjacent baffles 41. The plurality of strip-shaped liquid cooling channels 42 are arranged in parallel. A water outlet 43 is arranged between adjacent baffles 41. If a water outlet is provided on one baffle 41, another water outlet 43 is provided on the adjacent baffle 41 at 180 degrees opposite to the baffle 41. The heat exchanger outputs the liquid into the bottom strip-shaped liquid cooling channel 42, and finally reaches the top strip-shaped liquid cooling channel 42 and is discharged into the heat exchanger circulation.

[0050] Adjacent water inlets 43 are arranged opposite to each other, wherein only one water inlet is arranged on the same side, so as to achieve the effect of uniform liquid inlet.

[0051] The enameled wire coil between the inner side of the stator coil water jacket 5 and the inner circle of the motor silicon steel sheet 6 is potted with epoxy resin glue to prevent the enameled wire coil from current breakdown and waterproof and dustproof.

[0052] A temperature sensor is provided at one-half of the enameled wire coil. The temperature sensor is used to transmit the temperature data inside the coil to the machine tool control system and detect the real-time temperature of the motor. At the same time, the heat exchanger adjusts the input liquid temperature according to the monitored temperature.

[0053] A ring encoder is also provided at the bottom of the permanent magnet synchronous motor 2 for recording the number of rotations and the rotation speed of the permanent magnet synchronous motor 2 . The ring encoder is one of a magnetic grating, a time grating and a grating.

[0054] The rotating shaft 7 of the permanent magnet synchronous motor 2 is one of an integrally formed structure and a split structure.

[0055] At least one step is provided inside the stator coil water jacket 5 , and the end of the motor silicon steel sheet 6 abuts against the top of the step, which plays a role in height positioning when the motor silicon steel sheet 6 is installed.

[0056] The water outlet 43 processed on the blocking strip 41 is in the shape of a square notch or a crescent-shaped notch that is tangent to the outer circle of the bottom of the strip-shaped liquid cooling channel 42 .

[0057] A swing arm shaft 10 is also provided at one horizontal end of the five-axis turntable 1, and a swing arm drive motor 11 is provided on the side of the swing arm shaft 10. The swing arm shaft 10 and the swing arm drive motor 11 form a second liquid cooling channel. The structure of the second liquid cooling channel is consistent with the structure of the first liquid cooling channel 3, so that it can be quickly cooled down during driving, which is convenient for the heat dissipation of the swing arm drive motor 11.

[0058] Although the present application has disclosed multiple aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art, and several modifications and improvements may be made without departing from the concept of the present application, all of which belong to the protection scope of the present application. The multiple aspects and embodiments disclosed in the present application are only for illustration and are not intended to limit the present application. The actual protection scope of the present application shall be subject to the claims.

Claims

1. A five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor, comprising a five-axis turntable (1), a permanent magnet synchronous motor (2), and a first liquid cooling channel (3), characterized in that: A permanent magnet synchronous motor (2) is provided at the bottom of the five-axis turntable (1), and the permanent magnet synchronous motor (2) is used to drive the worktable of the five-axis turntable (1) to rotate. A water jacket shell (9) is provided on the inner side of the outer shell of the five-axis turntable (1), and the water jacket shell (9) is integrally formed with the five-axis turntable (1) or detachably connected. A first liquid cooling channel (3) is formed between the inner side of the outer shell of the five-axis turntable (1) and the outer side of the permanent magnet synchronous motor (2). The first liquid cooling channel (3) forms a circulation through a pipeline and an external heat exchanger. One end of the first liquid cooling channel (3) takes away the heat generated by the permanent magnet synchronous motor (2), and the other end of the first liquid cooling channel (3) circulates the cooling liquid cooled by the heat exchanger to the outer side of the permanent magnet synchronous motor (2) for continuous cooling.

2. The five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor as claimed in claim 1, characterized in that: The permanent magnet synchronous motor (2) comprises a stator coil water jacket (5), a motor silicon steel sheet (6), and a rotating shaft (7). The stator coil water jacket (5) is provided on the inner side of the five-axis turntable (1). The outer side of the stator coil water jacket (5) and the inner side of the five-axis turntable (1) form a first liquid cooling channel (3). The other side of the stator coil water jacket (5) is provided with a motor silicon steel sheet (6) and wraps the largest outer circle of the motor silicon steel sheet (6). An enameled wire coil is wound on the inner circle tooth groove of the motor silicon steel sheet (6). The center surrounded by the enameled wire coil is provided with a rotating shaft (7). The driving end of the rotating shaft (7) is connected to the turntable of the five-axis turntable (1). A circle of permanent magnets (8) is embedded in the axial direction of one circle of the outer diameter of the rotating shaft (7).

3. The five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor as claimed in claim 1, characterized in that: The first liquid cooling channel (3) is one of a spiral structure or a multi-layer parallel structure (4).

4. The five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor as claimed in claim 3, characterized in that: The multi-layer parallel structure (4) comprises a plurality of baffles (41), and a plurality of baffles (41) are arranged in parallel and at intervals on the outer wall of the stator coil water jacket (5) or the inner side of the five-axis turntable (1) near the end of the stator coil water jacket (5). A strip-shaped liquid cooling channel (42) is formed between adjacent baffles (41). The plurality of strip-shaped liquid cooling channels (42) are arranged in parallel, and a water outlet (43) is arranged between adjacent baffles (41). A baffle (41) is provided with a water outlet, and another water outlet (43) is arranged on the adjacent baffle 180 degrees opposite to the baffle (41). Liquid output from the heat exchanger enters the bottom strip-shaped liquid cooling channel (42), and finally reaches the top strip-shaped liquid cooling channel (42) and is discharged into the heat exchanger for circulation.

5. The five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor as claimed in claim 3, characterized in that: Adjacent water outlets (43) are arranged opposite to each other, wherein only one water outlet is arranged on the same side, so as to achieve the effect of uniform liquid inflow.

6. The five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor as claimed in claim 2, characterized in that: The enameled wire coil between the inner side of the stator coil water jacket (5) and the inner circle of the motor silicon steel sheet (6) is potted with epoxy resin glue to prevent the enameled wire coil from current breakdown and to prevent water and dust.

7. The five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor as claimed in claim 2, characterized in that: A temperature sensor is provided inside the enameled wire coil, which is used to transmit the temperature data inside the coil to the machine tool control system and detect the real-time temperature of the motor. At the same time, the heat exchanger adjusts the input liquid temperature according to the monitored temperature.

8. The five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor as claimed in claim 2, characterized in that: The rotating shaft (7) of the permanent magnet synchronous motor (2) is one of an integrally formed structure or a split structure.

9. The five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor as claimed in claim 1, characterized in that: At least one step is provided on the inner side of the stator coil water jacket (5), and the end of the motor silicon steel sheet (6) abuts against the top of the step, thus playing a role in height positioning when the motor silicon steel sheet (6) is installed.

10. The five-axis turntable driven by a liquid-cooled permanent magnet synchronous motor as claimed in claim 1, characterized in that: The water outlet (43) processed on the baffle (41) is in the shape of a square notch or a crescent-shaped notch that is tangent to the outer circle of the bottom of the strip-shaped liquid cooling channel (42).

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