Hollow cup motor coil winding device and method thereof

Abstract

The application is a hollow cup motor coil winding device and method with flat winding, high size precision and high production efficiency. A shaft pipe is coaxially sleeved on a rotating shaft, and a first jack set and a second jack set are arranged on the shaft pipe. The coil is wound based on the outer diameter of the shaft pipe. Therefore, when the coil with different inner diameters and lengths is wound, only the shaft pipe needs to be replaced, thereby improving the versatility of the tooling. After the coil is wound, the coil is directly taken off from the rotating shaft together with the shaft pipe, and is synchronously sleeved on a shaping column of a rounding unit to be shaped. During the shaping, the outer diameter of the shaft pipe is still used as the reference, thereby ensuring the precision of the inner diameter of the shaped coil.

Description

Technical Field

[0001] This invention relates to the field of hollow cup motor technology, and specifically to a hollow cup motor coil winding device and method. Background Technology

[0002] Hollow cup motors do not use a toothed iron core to house the windings. Instead, they use cup-shaped windings made of enameled wire. Therefore, they can effectively improve the motor power and the motor response speed, which is unmatched by other motors.

[0003] As the core component of a hollow cup motor, the coil winding is generally available in various types, such as skewed winding and polygonal (rhomboid, hexagonal, etc.). In existing technologies, the winding element is not directly wound into a cylindrical shape. Instead, a suitable tooling is first used to wind the winding element into a flat winding strip. This winding strip is formed by connecting multiple phase windings in series, and the conductors on the two sides of each phase winding are pulled together in sequence until they are guided to a position where they are in close contact with each other. Then, the flat winding strip is rolled into a cylindrical shape and bonded and cured using a suitable tooling. The entire process has high requirements for the manufacturing process. In actual winding design, due to the requirements of winding wire diameter, number of turns, and single-phase width, the width cannot accommodate the winding of a single layer. In this case, a multi-layer winding method is often used. However, although this method solves the winding requirements, in actual operation, the second layer of winding often squeezes the first layer of winding, and the third layer of winding squeezes the first and second layers of winding. This leads to the displacement of the lower layer winding, an increase in winding width, and uneven winding distribution. The first phase winding and the second phase winding are mixed, and the finished coil is wide in the middle and thin at both ends, resulting in an uneven winding strip. This leads to a low product yield and fluctuations in the final electrical performance of the motor.

[0004] In particular, cored motors used in medical devices, such as catheter pumps used in ventricular assist devices, can (partially) replace cardiac function, providing hemodynamic support for patients with cardiogenic shock or heart failure. After percutaneous implantation in the heart, the in-body motor drives the impeller to rotate, enabling the catheter pump to achieve a pumping flow rate of 2.5-6.0 L / min at a speed of 30,000-50,000 rpm, supporting short-term (days or weeks) or long-term (weeks or months) life-sustaining applications. Limited by the inner diameter of blood vessels, the outer diameter of catheter pumps is generally no more than 7 mm. The structural dimensions constrain motor performance, meaning that the motor must have a high rotor speed and large torque while maintaining a small geometric size. For cored motor coils, if there are overlapping sections along the entire circumference, it not only increases the winding diameter but also affects the winding utilization rate, reducing motor efficiency. Summary of the Invention

[0005] One objective of this invention is to provide a hollow cup motor coil winding device that features smooth winding, high dimensional accuracy, and high production efficiency.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a hollow cup motor coil winding device, comprising:

[0007] The winding unit includes a rotating shaft, one end of which is connected to a rotating mechanism and the other end is cantilevered. A shaft tube is coaxially sleeved on the rotating shaft, and the two form a detachable connection. The shaft tube is provided with a first set of insertion holes and a second set of insertion holes at intervals along its axial direction. Insert rods for winding copper wire are inserted into the insertion hole sets. The winding unit with this structure changes the traditional method of winding the coil of a hollow cup motor after winding, and instead winds the wire directly on the shaft tube so that the entire coil no longer has any overlapping parts.

[0008] The rounding unit includes a roller assembly consisting of two rollers arranged close together. A shaping post for mounting the coil semi-finished product is positioned between the two rollers, with its axis perpendicular to the rollers. Power drives the two rollers to move closer together to shape the coil semi-finished product or to move them away from each other. Because the copper wire in the coil semi-finished product wound by the winding unit is loose, with a small diameter in the middle and large diameter at both ends, the overall shape of the coil is uncertain and irregular, and the core is also uncertain. Therefore, it cannot be directly assembled into a motor. Furthermore, the loose copper wire also results in an excessively large outer diameter of the coil semi-finished product, making it unsuitable for use in the motor of an interventional pump. Therefore, the coil semi-finished product wound by the winding unit needs to be rounded. The two rollers continuously roll and shape the coil semi-finished product, thereby compressing and rounding the loose copper wire. Only a small amount of mechanical compression is needed to compress the loose copper wire in the coil semi-finished product without damaging the outer insulation layer of the copper wire.

[0009] The outer diameter of the rotating shaft is equal to the outer diameter of the shaping column and matches the inner diameter of the shaft tube. The shaft tube is coaxially sleeved on the rotating shaft, and the first and second insertion hole groups are opened on the shaft tube. The outer diameter of the shaft tube is used as the reference for winding the coil. Therefore, when used to wind coils with different inner diameters and lengths, only the shaft tube needs to be replaced, improving the versatility of the tooling. When performing the rounding operation after the coil is wound, due to the presence of the shaft tube, the coil and the shaft tube can be directly removed from the rotating shaft and simultaneously placed on the shaping column of the rounding unit for shaping. During shaping, the outer diameter of the shaft tube is still used as the reference, thereby ensuring the accuracy of the inner diameter of the coil after shaping. Because the shaft tube itself has a certain strength, and the inner diameter of the shaft tube matches the outer diameter of the shaping column of the round unit, when the shaft tube is sleeved on the outer circumference of the shaping column, the solid shaping column can reliably support the shaft tube. When the rollers roll and round the coil semi-finished product on it, the shaft tube can maintain its original shape without deformation. On the other hand, because the radius of the coil semi-finished product is very small, the two rollers only need to provide a small amount of mechanical pressure to achieve the pressing of the copper wire. This mechanical pressure will not cause any deformation to the shaft tube.

[0010] This invention reduces the diameter of the hollow cup motor coil while improving winding utilization and motor efficiency. Furthermore, since the winding process eliminates the need for rounding steps, it simplifies production and saves labor costs. When this hollow cup motor coil is applied to the motor of a ductal pump, compared to traditional motors, the motor of this invention can provide a smaller outer diameter and greater torque, thus increasing the overall blood flow rate of the ductal pump and meeting the physiological needs of the human body.

[0011] Furthermore, the first socket group includes a plurality of sockets evenly spaced along the circumference, and the second socket group includes a plurality of sockets evenly spaced along the circumference, with the sockets of the first socket group and the second socket group arranged in a one-to-one correspondence, and a plug rod is inserted into the socket.

[0012] Depending on the type of hollow cup motor coil to be wound, insert rods can be selected and placed in appropriate numbers and positions within the sockets. Other sockets remain unused. To achieve this, the rods and sockets are detachably connected. A magnet is embedded in the end of the rod near the socket, and the magnet is magnetically attracted to the socket. The sockets define the position of the rods, but the actual fixing effect comes from the magnetic attraction between the embedded magnet and the shaft / tube. This connection method makes the installation and removal of the rods very convenient.

[0013] Both rollers have annular grooves along their circumference. The curvature centers of the two closest annular grooves on the two rollers coincide, and the axis of the shaping column passes through this curvature center. When the power drives the two rollers to approach each other and roll the coil semi-finished product, the annular grooves can round the coil semi-finished product.

[0014] When the two rollers are brought close together by the power drive, the grooves on the two rollers form a complete circle, the diameter of which matches the diameter of the finished coil. The two roller shafts are parallel, at the same height, and arranged in a horizontal plane, while the shaping column is arranged in a vertical plane, with its core passing through the grooves to form the center of the complete circle. The diameter of the complete circle matches the diameter of the finished coil, thus compacting and rounding the coil semi-finished product. This ensures that the diameter of the finished coil matches the design value and that its core has high precision. When assembled into the motor, this guarantees the coaxiality of the finished coil with the housing and rotor, improving the motor's efficiency.

[0015] The shaping column is fixedly connected to the piston rod of the lifting and rotating cylinder. The lifting and rotating cylinder drives the shaping column to move up and down and / or rotate along its axis, which reduces the rounding time and improves the rounding efficiency.

[0016] The line connecting the corresponding sockets in the first and second socket groups is arranged parallel to the axis of the rotating shaft. In other words, the number, orientation, and position of the multiple sockets in the first and second socket groups are the same.

[0017] Furthermore, the first and second socket groups each contain 6n sockets, where n is an integer ≥ 1. When n = 1, the structure of the winding fixture is as follows: Figure 1 , Figure 2 As shown, the wound hollow cup motor coil is a standard three-phase motor winding, with each coil group spanning a mechanical angle of 120°. When n=2, the wound hollow cup motor coil is a three-phase motor winding, with each phase containing two coil groups, each coil group spanning a mechanical angle of 60°, and so on. Depending on the specific type of hollow cup motor coil to be wound, inserting the insert rods 23 into appropriate numbers and positions of the sockets, leaving the other sockets (a) unused, allows for the winding of various hollow cup motor coils using the same winding unit, improving the versatility of the winding unit.

[0018] Preferably, the plug rods on one socket group and the plug rods on another socket group that are 180° apart form the same winding frame, which is for the oblique winding coil of a three-phase motor.

[0019] To ensure a reliable connection between the shaft and the rotating mechanism, a connecting shaft section is provided at one end of the shaft near the rotating mechanism. This connecting shaft section is inserted into the rotating mechanism and rotates synchronously. A wire-embedding groove is provided on the outer wall of the connecting shaft section to fix one end of the copper wire during winding, ensuring the copper wire remains flat. Six wire-embedding grooves are evenly spaced along the circumference of the connecting shaft section. These six grooves can be aligned with the insertion holes or staggered, as long as the end of the copper wire is fixed. The misalignment does not affect the winding effect. The winding fixture in this invention can wind both star-shaped and delta-shaped windings. A star-shaped winding refers to connecting the three ends of the motor windings together, with the first three phases serving as the power supply terminals, outputting 220V. A delta-shaped winding refers to connecting the beginning and end of the three-phase windings together, with all three endpoints serving as power supply terminals, outputting 380V. In this way, even when each phase contains more than one coil group, it can still be ensured that each phase coil group has only one lead and one output, and the entire hollow cup motor coil has only 6 wires. This simplifies the time and difficulty of welding each wire to the corresponding commutator segment, resulting in high reliability and very high production efficiency. It also simplifies the control system used to control the motor.

[0020] The outer shaft tubes of the first and second socket groups are equipped with detection marks or convex rings as reference lines for the position of the copper wire (this is calculated based on the characteristics of the specific coil). When the wound copper wire exceeds the detection mark or convex ring position by too much, or fails to reach the detection mark or convex ring and the difference is large, it indicates that the number of turns of the copper wire is incorrect. This allows for a preliminary inspection of the number of turns of the copper wire during winding, thereby improving the product qualification rate.

[0021] Another objective of this invention is to provide a method for winding hollow cup motor coils that results in smooth winding, high dimensional accuracy, and high production efficiency.

[0022] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a method for winding a hollow cup motor coil, comprising the following steps:

[0023] S1) Select a shaft tube with a suitable outer diameter according to the specifications of the finished coil to be wound, and fit the shaft tube around the outer circumference of the rotating shaft;

[0024] S2) Select the appropriate number of insert rods and insert them into the corresponding sockets;

[0025] S3) Insert one end of the copper wire into the winding groove, and wind it manually or with a winding machine in the winding space of the two sets of plugs staggered by 180°. After winding to the required number of turns, cut the lead wire of the copper wire (A) to form a single-phase winding.

[0026] S4) After the single-phase winding is completed, the next single-phase winding is wound in the same way to obtain a coil semi-finished product.

[0027] S5) Remove the insertion rod and take the coil semi-finished product together with the shaft tube off the rotating shaft;

[0028] S6) Fit the shaft tube from step S5) onto the shaping column of the rounding unit, start the rounding unit, and drive the two rollers to move closer to each other to perform a rounding operation on the coil semi-finished product to obtain the coil finished product.

[0029] S7) First, remove the finished coil along with the shaft tube from the shaping column, and then remove the finished coil from the shaft tube to obtain a separate finished coil.

[0030] When a single-phase winding contains two or more coil groups, after winding one coil group, directly wind the next coil group of the same phase.

[0031] In step S6), while the annular grooves on the two rollers form a complete circle to shape the coil semi-finished product, the lifting rotary cylinder drives the shaping column to perform periodic lifting and rotating movements.

[0032] The coil is wound using the outer diameter of the shaft tube as a reference. During the rounding operation after the coil winding is complete, the presence of the shaft tube allows the semi-finished coil, along with the shaft tube, to be directly removed from the rotating shaft and simultaneously placed onto the shaping post of the rounding unit for shaping. During shaping, the outer diameter of the shaft tube is still used as the reference, thus ensuring the accuracy of the inner diameter of the finished coil after shaping. Therefore, when used to wind coils with different inner diameters and lengths, only the shaft tube needs to be replaced, improving the versatility of the tooling. Attached Figure Description

[0033] Figure 1 This is a 3D view of the winding unit;

[0034] Figure 2 for Figure 1 A schematic diagram of the structure after removing the insert rod;

[0035] Figure 3 A schematic diagram of the structure when the roller groups of a complete circular unit are far apart from each other;

[0036] Figure 4 This is a schematic diagram of the structure when the roller groups of a complete circular unit are close to each other;

[0037] Figure 5 for Figure 3 The main view;

[0038] Figure 6 for Figure 4 The main view;

[0039] Figure 7 This is a schematic diagram of the structure after the complete circle unit is formed.

[0040] Figure 8 This is a picture of the finished coil. Detailed Implementation

[0041] The following is combined Figures 1-8 The present invention will be further described in detail below. These embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0042] A hollow cup motor coil winding device, comprising:

[0043] The winding unit includes a rotating shaft 10, one end of which is connected to a rotating mechanism and the other end is cantilevered. A shaft tube 20 is coaxially sleeved on the rotating shaft 10 and the two form a detachable connection. The shaft tube 20 is provided with a first insertion hole group 21 and a second insertion hole group 22 at intervals along its axial direction. Insert rods 23 for winding copper wire A are inserted into the insertion hole groups.

[0044] The rounding unit includes a roller group consisting of two roller shafts 31 arranged close to each other. A shaping column 33 for fitting the coil semi-finished product B is provided between the two rollers 32. The axis of the shaping column 33 is arranged perpendicular to the roller shafts 31. The two rollers 32 are driven to move closer to each other to shape the coil semi-finished product B or to move the two rollers 32 away from each other.

[0045] The outer diameter of the rotating shaft 10 is equal to the outer diameter of the shaping column 33 and matches the inner diameter of the shaft tube 20.

[0046] The coil is wound using the outer diameter of the shaft tube 20 as a reference. During the rounding operation after the coil winding is complete, the presence of the shaft tube 20 allows the semi-finished coil B, along with the shaft tube 20, to be directly removed from the rotating shaft 10 and simultaneously placed onto the shaping post 33 of the rounding unit for shaping. During shaping, the outer diameter of the shaft tube 20 is still used as a reference, thus ensuring the accuracy of the inner diameter of the finished coil C after shaping. Therefore, when used to wind coils of different inner diameters and lengths, only the shaft tube 20 needs to be replaced. To accommodate coils of different diameters, different shaft tubes 20 have different outer diameters and different distances between their insertion holes a and the two insertion hole groups, but their inner diameters are all equal. They can all mate with the same rotating shaft 10 and the same shaping post 33, and the inner diameter of the shaft tube 20 is equal to the outer diameter of the rotating shaft 10 and the outer diameter of the shaping post 33, thereby improving the versatility of the tooling. There are various models of duct pumps, but the production of hollow cup motor coils for all models of duct pumps can be achieved by using only one set of winding unit and complete circle unit, in conjunction with various different specifications of shaft tube 20, which greatly reduces costs.

[0047] Furthermore, the first socket group 21 includes a plurality of sockets a evenly spaced along the circumference, and the second socket group 22 includes a plurality of sockets a evenly spaced along the circumference, and the sockets a of the first socket group 21 and the second socket group 22 are arranged in a one-to-one correspondence, and a plug rod 23 is inserted into the socket a.

[0048] As a preferred embodiment, the insertion rod 23 and the insertion hole a form a detachable connection. A magnet is embedded in one end of the insertion rod 23 near the insertion hole a, and the magnet is magnetically fixed to the insertion hole a. This structure facilitates installation and disassembly, and also limits the relative position of the shaft tube 20 and the rotating shaft 10.

[0049] Both rollers 32 have annular grooves 321 circumferentially formed on their surfaces. The centers of curvature of the two annular grooves 321 at their closest positions on the two rollers 32 coincide, and the axis of the shaping column 33 passes through these centers of curvature. Here, "closest position" refers to... Figure 7 As shown, the roller 32 is located at the horizontal plane passing through the two roller shafts 31.

[0050] When the two rollers 32 are driven to approach each other, the groove surfaces of the annular grooves 321 on the two rollers 32 form a complete circle. The diameter of the complete circle matches the diameter of the finished coil C, ensuring that the outer diameter and core of the finished coil C are aligned after the circle is formed.

[0051] As a preferred embodiment, the two rollers 31 are parallel, at the same height, and both are arranged in a horizontal plane, while the shaping column 33 is arranged in a vertical plane, with the core of the shaping column 33 passing through the groove surface 321a to form the center of a complete circle. The angle between the rollers 31 and the shaping column 33 is not limited to this one, as long as their relative positional relationship is maintained.

[0052] The shaping column 33 is fixedly connected to the piston rod of the lifting and rotating cylinder. The lifting and rotating cylinder drives the shaping column 33 to move up and down and / or rotate along its axis.

[0053] The line connecting the corresponding sockets a of the first socket group 21 and the second socket group 22 is arranged parallel to the axis of the rotating shaft 10.

[0054] The first socket group 21 and the second socket group 22 each contain 6n sockets a, where n is an integer ≥ 1.

[0055] The plug 23 on one socket group and the plug 23 on another socket group that are offset by 180° form the same winding frame.

[0056] In order to reliably connect with the rotating mechanism, a connecting shaft section 11 is provided at one end of the rotating shaft 10 near the rotating mechanism. The connecting shaft section 11 is inserted into the rotating mechanism and rotates synchronously. A wire groove (not shown in the figure) is provided on the outer wall of the connecting shaft section 11. The wire groove is evenly and spaced out in six places in the circumferential direction of the connecting shaft section 11.

[0057] Furthermore, the shaft tube 20 on the outer side of the first socket group 21 and the second socket group 22 is provided with detection marks or raised rings b for preliminary inspection.

[0058] The winding device in this invention reduces the diameter of the hollow cup motor coil and improves the utilization rate of the winding, thereby increasing the efficiency of the motor. After winding, there is no need for rounding or other steps, simplifying the production process and saving labor costs. When this hollow cup motor coil is applied to the motor of a catheter pump, compared with traditional motors, the motor of this invention can provide a smaller outer diameter and greater torque, thus increasing the overall blood flow of the catheter pump and meeting the physiological needs of the human body.

[0059] A method for winding a coil for a hollow cup motor includes the following steps:

[0060] S1) Select a shaft tube 20 with a suitable outer diameter according to the specifications of the finished coil C and fit the shaft tube 20 around the outer circumference of the rotating shaft 10. The specifications here include, but are not limited to, the diameter, length and number of holes of the finished coil C. The inner diameter of the shaft tube 20 matches the outer diameter of the rotating shaft 10. The friction between the two, plus the fact that the rotating shaft 10 rotates very slowly when winding the copper wire A, means that the shaft tube 20 will hardly rotate.

[0061] S2) Select an appropriate number of insert rods 23 according to the specific form of the hollow cup motor coil to be wound and insert them into the corresponding insertion holes a; since the end of the insert rod 23 is provided with a magnet, the insert rod 23 can be attracted to the rotating shaft 10, further eliminating the possibility of the shaft tube 20 rotating around the rotating shaft 10, thereby ensuring the stability of the wound coil.

[0062] S3) Insert one end of copper wire A into the winding groove. The wire is wound manually or by a winding machine in the winding space of the insertion rods 23 staggered by 180° in the two sets of insertion holes. Copper wire A is wound with the outer diameter of shaft tube 20 as the reference. After the required number of turns is reached, the lead wire of copper wire A is cut to form a single-phase winding.

[0063] S4) After the single-phase winding is completed, the next single-phase winding is wound in the same way to obtain coil semi-finished product B; there is no overlap between the coils, which can improve the utilization rate of the winding and make the motor efficiency higher than that of conventional DC brushless hollow cup motor.

[0064] S5) First, remove the insertion rod 23, and the limit of the shaft tube 20 is released. At this time, remove the coil semi-finished product B together with the shaft tube 20 from the rotating shaft 10.

[0065] S6) Fit the shaft tube 20 from step S5) onto the shaping column 33 of the rounding unit, start the rounding unit, and at this time, the outer diameter of the shaft tube 20 is still used as the reference for rounding. The power drives the two rollers 32 to move closer to each other to perform rounding operation on the coil semi-finished product B, and finally obtain the coil finished product C.

[0066] S7) First, remove the finished coil C together with the shaft tube 20 from the shaping column 33, and then remove the finished coil C from the shaft tube 20 to obtain the individual finished coil C.

[0067] When a single-phase winding contains two or more coil groups, after winding one coil group, directly wind the next coil group of the same phase. Taking a three-phase winding with two coils in a single-phase winding as an example, each coil spans a mechanical angle of 60°. After winding the first coil of that phase winding, directly wind the second coil of the same phase winding across 120 degrees, then cut it to form a complete single-phase winding. Then, use the same method to wind the next single-phase winding. The advantage of this is that it can save the time of changing wires in the middle and improve the winding efficiency.

[0068] In step S6), while the groove surfaces of the annular grooves 321 on the two rollers 32 form a complete circle to shape the coil semi-finished product B, the lifting rotary cylinder drives the shaping column 33 to perform periodic lifting and rotating movements. Therefore, the entire coil semi-finished product B can be rolled and rounded from top to bottom on the entire circumference.

Claims

1. A device for winding coils of a hollow cup motor, characterized in that: The winding unit includes a rotating shaft (10), one end of which is connected to a rotating mechanism and the other end is cantilevered. A shaft tube (20) is coaxially sleeved on the rotating shaft (10) and the two form a detachable connection. The shaft tube (20) is provided with a first insertion hole group (21) and a second insertion hole group (22) at intervals along its axial direction. A plug rod (23) for winding copper wire (A) is inserted into the insertion hole group. The rounding unit includes a roller group consisting of two roller shafts (31) arranged close to each other. A shaping column (33) for fitting the coil semi-finished product (B) is provided between the two rollers (32). The axis of the shaping column (33) is arranged perpendicular to the roller shafts (31). The two rollers (32) are driven to move closer to each other to shape the coil semi-finished product (B) or to move the two rollers (32) away from each other. The outer diameter of the rotating shaft (10) is equal to the outer diameter of the shaping column (33) and matches the inner diameter of the shaft tube (20).

2. A hollow cup motor coil winding apparatus according to claim 1, characterised in that: The first socket group (21) includes a plurality of sockets (a) evenly spaced along the circumference, and the second socket group (22) includes a plurality of sockets (a) evenly spaced along the circumference. The sockets (a) of the first socket group (21) and the second socket group (22) are arranged in a one-to-one correspondence, and a plug rod (23) is inserted into the socket (a).

3. A hollow cup motor coil winding apparatus according to claim 2, characterised in that: The plug rod (23) and the socket (a) form a detachable connection. A magnet is embedded in one end of the plug rod (23) near the socket (a), and the magnet is magnetically fixed to the socket (a).

4. The hollow cup motor coil winding device according to claim 1, characterized in that: Both rollers (32) have annular grooves (321) along their circumference on their roller surfaces. The curvature centers of the two annular grooves (321) at the closest positions on the two rollers (32) coincide, and the axis of the shaping column (33) passes through the curvature center.

5. The hollow cup motor coil winding device according to claim 4, characterized in that: When the two rollers (32) are driven to approach each other, the groove surfaces of the annular grooves (321) on the two rollers (32) form a complete circle, and the diameter of the complete circle matches the diameter of the finished coil (C).

6. The hollow cup motor coil winding device according to claim 5, characterized in that: The two rollers (31) are parallel, at the same height and both are arranged in the horizontal plane, and the shaping column (33) is arranged in the vertical plane, and the core of the shaping column (33) passes through the groove surface to form the center of a complete circle.

7. The hollow cup motor coil winding device according to claim 6, characterized in that: The shaping column (33) is fixedly connected to the piston rod of the lifting and rotating cylinder. The lifting and rotating cylinder drives the shaping column (33) to move up and down and / or rotate along its axis.

8. The hollow cup motor coil winding device according to claim 2 or 3, characterized in that: The line connecting the corresponding sockets (a) of the first socket group (21) and the second socket group (22) is arranged parallel to the axis of the rotating shaft (10).

9. The hollow cup motor coil winding device according to claim 2 or 3, characterized in that: The first socket group (21) and the second socket group (22) each contain 6n sockets (a), where n is an integer ≥ 1.

10. The hollow cup motor coil winding device according to claim 2 or 3, characterized in that: The plug (23) on one socket group and the plug (23) on another socket group that are offset by 180° form the same winding frame.

11. The hollow cup motor coil winding device according to claim 1, characterized in that: A connecting shaft section (11) is provided at one end of the rotating shaft (10) near the rotating mechanism. The connecting shaft section (11) is inserted into the rotating mechanism and rotates synchronously. A wire groove is provided on the outer wall of the connecting shaft section (11). The wire groove is provided in six evenly spaced grooves in the circumferential direction of the connecting shaft section (11).

12. The hollow cup motor coil winding device according to claim 1, characterized in that: The shaft tube (20) on the outside of the first socket group (21) and the second socket group (22) is provided with detection marks or convex rings (b).

13. A method for winding a hollow cup motor coil, comprising the hollow cup motor coil winding apparatus according to any one of claims 1-12, characterized in that, Includes the following steps: S1) Select a shaft tube (20) with a suitable outer diameter according to the specifications of the finished coil (C) to be wound, and fit the shaft tube (20) on the outer circumference of the rotating shaft (10); S2) Select an appropriate number of insert rods (23) and insert them into the corresponding holes (a); S3) Insert one end of the copper wire (A) into the winding groove, and manually or by winding machine wind the wire in the winding space of the insertion rod (23) staggered by 180° in the two sets of insertion holes. When the required number of turns is reached, cut the lead wire of the copper wire (A) to form a single-phase winding. S4) After the single-phase winding is completed, the next single-phase winding is wound in the same way to obtain the coil semi-finished product (B); S5) Remove the insert (23) and take the coil semi-finished product (B) together with the shaft tube (20) off the rotating shaft (10); S6) Fit the shaft tube (20) from step S5) onto the shaping column (33) of the rounding unit, start the rounding unit, and drive the two rollers (32) to move closer to each other to perform a rounding operation on the coil semi-finished product (B) to obtain the coil finished product (C). S7) First, remove the finished coil (C) together with the shaft tube (20) from the shaping column (33), and then remove the finished coil (C) from the shaft tube (20) to obtain a separate finished coil (C).

14. The method for winding a hollow cup motor coil according to claim 13, characterized in that: When a single-phase winding contains two or more coil groups, after winding one coil group, directly wind the next coil group of the same phase.

15. The method for winding a hollow cup motor coil according to claim 13, characterized in that: In step S6), the groove surfaces of the annular grooves (321) on the two rollers (32) form a complete circle to shape the coil semi-finished product (B). At the same time, the lifting rotary cylinder drives the shaping column (33) to perform periodic lifting and rotating movements.

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