A four-pole hollow cup motor structure

Abstract

The utility model relates to brushless DC motor technical field, and disclose a kind of four magnetic pole hollow cup motor structure, including shell, front end cover and back cover assembly, the front end cover and back cover assembly center place is provided with transmission rod, the transmission rod outer side is fixedly installed with coil winding, the shell inside is fixedly installed with permanent magnet, the coil winding includes installation cover and locating post, the locating post outer side is fixedly installed with winding coil. This four magnetic pole hollow cup motor structure, through the design of multiple winding coils, in adjacent winding coil, the locating groove of another is embedded in the clamping post of one winding coil, the fixation between winding coil and position calibration can be realized, by integrated structure can rotate synchronously with transmission rod, avoid the electromagnetic imbalance caused by single coil loosening, can simplify assembly process, through front bearing, rear bearing support transmission rod rotation, cooperate with sealing ring one and sealing ring two and sealing pad one and sealing pad two can realize double sealing.

Description

Technical Field

[0001] This utility model relates to the field of brushless DC motor technology, specifically a four-pole hollow cup motor structure. Background Technology

[0002] Coreless brushless motors belong to the category of DC permanent magnet servo micro motors. The main difference between them and ordinary brushless DC motors is that the armature core lacks slots. The motor windings are manufactured into a cup shape using a special winding process. Compared to traditional slotted motors, they offer the following advantages: 1. High efficiency: Coreless motors generally have an efficiency of over 70%, with some products even approaching 90%, while traditional slotted motors of the same size and weight have efficiencies below 70%; 2. Small size, light weight, and high power and torque density: Due to increased efficiency and reduced losses, the power density of coreless motors is significantly improved. Compared to traditional slotted motors, their size and weight can be reduced by 30%. 3. Good control performance: Small torque fluctuation caused by no cogging effect, smooth motor operation; low electromechanical time constant, good dynamic response, very low motor inductance, conventional electrical time constant within 0.1ms, electromechanical time constant around 2ms, rapid motor response, precise control, suitable for high-precision drive systems, such as communication, robotics, security, aerospace, steering control systems, etc. With the expansion of the application scope of products such as model aircraft, drones, robots, gimbals, etc., requirements for drive motors have been put forward for light weight, miniaturization, high power density, high torque density, high efficiency, high dynamic response, high reliability, and safety.

[0003] Currently, due to technological limitations, most coreless brushless motors use a single pole pair, hexagonal winding structure, and delta connection method. This type of motor has a relatively high speed, but a low back EMF and motor torque coefficient, making it impossible to develop coreless brushless DC motors with high torque density and power density.

[0004] Chinese Utility Model Patent Publication No. CN111884385A discloses a hollow cup brushless DC motor. The specification of this hollow cup brushless DC motor reveals that it employs concentric windings and a layout with no overlapping windings, resulting in a short air gap with a limited number of turns. This allows for a multi-layer winding layout within a limited annular air gap, thereby improving winding space utilization, reducing resistance per unit back EMF, and minimizing copper losses. This effectively improves motor efficiency, torque density, and power density. However, while this hollow cup brushless DC motor effectively improves motor efficiency, torque density, and power density, it lacks a connection structure between multiple winding coils. This not only makes it difficult to fix and calibrate the winding coils but also easily leads to electromagnetic imbalance caused by loosening of individual coils. Furthermore, the lack of an overall assembly process results in poor overall practicality. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a four-pole hollow cup motor structure, which can effectively solve the problems in the prior art. Although it can effectively improve the motor efficiency, torque density and power density, it does not design a connection structure between multiple winding coils. This not only makes it difficult to fix and calibrate the winding coils, but also easily leads to electromagnetic imbalance caused by the loosening of a single coil. Furthermore, the lack of an overall assembly process results in poor overall practicality.

[0006] The technical solution adopted by this utility model is: a four-pole hollow cup motor structure, including a shell, a front cover and a rear cover assembly, a transmission rod is provided at the center of the front cover and the rear cover assembly, a coil winding is fixedly installed at the outer edge of the transmission rod, and a permanent magnet is fixedly installed inside the shell;

[0007] The coil winding includes a mounting cover and a positioning post. The coil winding is fixedly installed on the outer edge of the positioning post. A positioning groove is opened at one end of the coil winding near the rear cover assembly, and a locking post is fixedly installed at the other end of the coil winding away from the rear cover assembly.

[0008] Preferably, the rear cover assembly includes a rear end cover, and a shaft seat and a retainer are fixedly installed at one end of the rear end cover near the outer shell, the retainer being adapted to the outer shell.

[0009] Through the above technical solution, the rear end cover of the rear cover assembly supports the transmission rod through the shaft seat. With the fixing of the clamp and the outer shell, the coaxial positioning of the rear end cover and the outer shell and the radial support of the transmission rod can be achieved. This can stabilize the rear end of the motor, improve the rotation accuracy of the transmission rod, and reduce motor noise and component wear caused by radial runout.

[0010] Preferably, a positioning post is fixedly installed at one end of the mounting cover near the rear cover assembly, and a slot is provided through the outer edge of the winding coil, with the slot corresponding one-to-one with the positioning post.

[0011] Through the above technical solution, the cooperation between the slot and the positioning post allows multiple winding coils to be quickly aligned by inserting the positioning post into the slot during installation. This operation can be repeated to achieve rapid alignment of multiple winding coils and also prevents the winding coils from shifting easily during rotation.

[0012] Preferably, the positioning posts are provided in two identical sets, and each set of the positioning posts has two identical posts, and the two sets of positioning posts are distributed in a ring about the center line of the mounting cover.

[0013] The above technical solution allows four winding coils to be fixed by two sets of ring-shaped positioning posts. The ring layout ensures that the winding coils are evenly distributed around the circumference and correspond one-to-one with the magnetic poles of the permanent magnet inside the shell. The symmetrical structure ensures that the electromagnetic force generated by each winding coil after being energized is evenly applied to the transmission rod, avoiding the displacement of the transmission rod caused by unilateral force.

[0014] Preferably, there are multiple identical winding coils, and one of the winding coils has a locking post that engages with a positioning groove.

[0015] Through the above technical solution, and through the design of multiple winding coils, in adjacent winding coils, the locking post of one winding coil is embedded in the positioning groove of another, which can realize the fixation and position calibration between winding coils. Through the integrated structure, it can rotate synchronously with the transmission rod, avoiding electromagnetic imbalance caused by the loosening of a single coil, and simplifying the assembly process.

[0016] Preferably, a front bearing and a rear bearing are fixedly installed on the outer edge of the transmission rod. A sealing ring 1 and a sealing ring 2 are provided at both ends of the transmission rod located on the front bearing, and a sealing gasket 1 and a sealing gasket 2 are provided at both ends of the transmission rod located on the rear bearing.

[0017] The above technical solution supports the rotation of the transmission rod through the front and rear bearings. With the cooperation of sealing ring one and sealing ring two, as well as sealing gasket one and sealing gasket two, a double seal can be achieved, which can not only play the role of transmission, but also play the role of sealing, thus preventing internal contamination.

[0018] Preferably, a locking block is fixedly installed at one end of the outer shell near the front cover, the locking block is engaged with the front cover, and the front cover and the outer shell are welded together.

[0019] Through the above technical solution, the design of the locking block allows the locking block of the outer shell to be initially positioned by locking with the front cover, and then fixed by welding to achieve a rigid connection between the outer shell and the front cover, ensuring the overall structural stability of the motor.

[0020] Compared with the prior art, this utility model provides a four-pole hollow cup motor structure, which has the following beneficial effects:

[0021] 1. The structure of this four-pole hollow cup motor, through the design of the locking block, allows the locking block of the outer shell to be initially positioned by locking with the front cover, and then fixed by welding to achieve a rigid connection between the outer shell and the front cover, ensuring the stability of the overall structure of the motor. The rear cover of the rear cover assembly supports the transmission rod through the shaft seat. With the fixing of the locking piece and the outer shell, the coaxial positioning of the rear cover and the outer shell and the radial support of the transmission rod can be achieved.

[0022] 2. This four-pole hollow cup motor structure, through the design of multiple winding coils, in adjacent winding coils, the locking post of one winding coil is embedded in the positioning groove of another, which can realize the fixation and position calibration between the winding coils. Through the integrated structure, it can rotate synchronously with the transmission rod, avoiding electromagnetic imbalance caused by the loosening of a single coil, which can simplify the assembly process. The transmission rod is supported by the front bearing and the rear bearing, and double sealing can be achieved with the cooperation of sealing ring one and sealing ring two and sealing gasket one and sealing gasket two. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0025] Figure 3 This is a schematic cross-sectional view of the present invention.

[0026] Figure 4 This is a three-dimensional structural diagram of the back cover assembly of this utility model;

[0027] Figure 5 This is a schematic diagram of the disassembled structure of the outer shell and back cover of this utility model;

[0028] Figure 6 This is a schematic diagram showing the disassembled structure of the coil winding and permanent magnet of this utility model;

[0029] Figure 7 This is a three-dimensional structural diagram of the coil winding of this utility model.

[0030] The components are as follows: 1. Outer shell; 2. Clamping block; 3. Front end cover; 4. Front bearing; 5. Sealing ring one; 6. Sealing ring two; 7. Rear cover assembly; 701. Rear end cover; 702. Shaft seat; 703. Clamping piece; 8. Rear bearing; 9. Sealing gasket one; 10. Sealing gasket two; 11. Transmission rod; 12. Coil winding; 1201. Mounting cover; 1202. Positioning post; 1203. Winding coil; 1204. Clamping slot; 1205. Positioning groove; 1206. Clamping post; 13. Permanent magnet. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1: As Figure 1-7 As shown, the present invention provides a four-pole hollow cup motor structure, including a shell 1, a front cover 3 and a rear cover assembly 7. A transmission rod 11 is provided at the center of the front cover 3 and the rear cover assembly 7. A coil winding 12 is fixedly installed at the outer edge of the transmission rod 11. A permanent magnet 13 is fixedly installed inside the shell 1.

[0033] The coil winding 12 includes a mounting cover 1201 and a positioning post 1202. A winding coil 1203 is fixedly mounted on the outer edge of the positioning post 1202. A positioning groove 1205 is provided at one end of the winding coil 1203 near the rear cover assembly 7. A locking post 1206 is fixedly mounted at one end of the winding coil 1203 away from the rear cover assembly 7.

[0034] Specifically, the rear cover assembly 7 includes a rear cover 701. A shaft seat 702 and a clamp 703 are fixedly installed on one end of the rear cover 701 near the outer shell 1. The clamp 703 is adapted to the outer shell 1. The advantage is that the rear cover 701 of the rear cover assembly 7 supports the transmission rod 11 through the shaft seat 702. With the clamp 703 and the outer shell 1 being fixed, the coaxial positioning of the rear cover 701 and the outer shell 1 and the radial support of the transmission rod 11 can be achieved. This can make the rear end of the motor stable, improve the rotation accuracy of the transmission rod 11, and reduce motor noise and component wear caused by radial runout.

[0035] Specifically, a positioning post 1202 is fixedly installed on one end of the mounting cover 1201 near the rear cover assembly 7, and a slot 1204 is provided through the outer edge of the winding coil 1203. The slot 1204 corresponds one-to-one with the positioning post 1202. The advantage is that, through the cooperation of the slot 1204 and the positioning post 1202, when installing the winding coil 1203, the positioning post 1202 can be inserted into the slot 1204, which can quickly align multiple winding coils 1203. This operation can be repeated to achieve quick alignment of multiple winding coils 1203, and can also prevent the winding coil 1203 from easily shifting during rotation.

[0036] Specifically, there are two identical sets of positioning posts 1202, with two identical posts in each set. The two sets of positioning posts 1202 are arranged in a ring around the center line of the mounting cover 1201. The advantage is that the four winding coils 1203 can be fixed by the two sets of ring-shaped positioning posts 1202 respectively. The ring layout makes the winding coils 1203 evenly distributed around the circumference and corresponds one-to-one with the magnetic poles of the permanent magnet 13 inside the outer shell 1. The symmetrical structure allows the electromagnetic force generated by each winding coil 1203 after being energized to act evenly on the transmission rod 11, avoiding the displacement of the transmission rod 11 caused by unilateral force.

[0037] Example 2: Figure 2-7 As shown, this is an improvement on the previous embodiment.

[0038] Specifically, multiple winding coils 1203 are provided. The locking post 1206 on one winding coil 1203 is engaged with the positioning groove 1205. The advantage is that, through the design of multiple winding coils 1203, the locking post 1206 of one winding coil 1203 is embedded in the positioning groove 1205 of another adjacent winding coil 1203, which can realize the fixation and position calibration between winding coils 1203. Through the integrated structure, it can rotate synchronously with the transmission rod 11, avoiding electromagnetic imbalance caused by the loosening of a single coil, and simplifying the assembly process.

[0039] Specifically, a front bearing 4 and a rear bearing 8 are fixedly installed on the outer edge of the transmission rod 11. Both ends of the transmission rod 11 at the front bearing 4 are provided with a sealing ring 5 and a sealing ring 6, and both ends of the transmission rod 11 at the rear bearing 8 are provided with a sealing gasket 9 and a sealing gasket 10. The advantage is that the transmission rod 11 is supported by the front bearing 4 and the rear bearing 8 to rotate. With the sealing rings 5 ​​and 6 and the sealing gaskets 9 and 10, a double seal can be achieved, which can play both the role of transmission and the role of sealing, thus preventing internal contamination.

[0040] Specifically, a locking block 2 is fixedly installed at one end of the outer casing 1 near the front cover 3. The locking block 2 is engaged with the front cover 3, and the front cover 3 and the outer casing 1 are welded together. The advantage is that the design of the locking block 2 allows the locking block 2 of the outer casing 1 to be initially positioned by engaging with the front cover 3, and then fixed by welding to achieve a rigid connection between the outer casing 1 and the front cover 3, ensuring the overall stability of the motor structure.

[0041] Working Principle: During use, the rear end cover 701 of the rear cover assembly 7 supports the transmission rod 11 via the shaft seat 702. Combined with the fixing of the clamp 703 to the outer shell 1, coaxial positioning of the rear end cover 701 and the outer shell 1 and radial support of the transmission rod 11 are achieved. This stabilizes the rear end of the motor, improves the rotational accuracy of the transmission rod 11, and reduces motor noise and component wear caused by radial runout. The cooperation between the slot 1204 and the positioning post 1202 allows for quick alignment of multiple winding coils 1203 when installing them, by inserting the positioning post 1202 into the slot 1204. This operation can be repeated to achieve rapid alignment of multiple winding coils 1203 and prevent displacement of the winding coils 1203 during rotation. Two sets of annularly distributed positioning posts 1202 can fix four winding coils 1203 respectively, and the annular layout ensures that the winding coils 1203 are evenly distributed circumferentially and aligned one-to-one with the magnetic poles of the permanent magnet 13 inside the outer shell 1. Correspondingly, the symmetrical structure ensures that the electromagnetic force generated by each winding coil 1203 after being energized is evenly applied to the transmission rod 11, avoiding the displacement of the transmission rod 11 caused by unilateral force. Through the design of multiple winding coils 1203, in adjacent winding coils 1203, the locking post 1206 of one winding coil 1203 is embedded into the positioning groove 1205 of another, which can realize the fixation and position calibration between winding coils 1203. Through the integrated structure, it can rotate synchronously with the transmission rod 11, avoiding electromagnetic imbalance caused by the loosening of a single coil, which can simplify the assembly process. The transmission rod 11 is supported by the front bearing 4 and the rear bearing 8. With the cooperation of sealing ring 1 5 and sealing ring 2 6 and sealing gasket 1 9 and sealing gasket 2 10, double sealing can be achieved, which can play both the role of transmission and sealing, preventing internal contamination. Through the design of the locking block 2, the locking block 2 of the outer shell 1 can be initially positioned by locking with the front cover 3, and then fixed by welding to achieve a rigid connection between the outer shell 1 and the front cover 3, ensuring the overall structural stability of the motor.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A four-pole hollow cup motor structure, comprising a housing (1), a front cover (3), and a rear cover assembly (7), characterized in that: A transmission rod (11) is provided at the center of the front cover (3) and the rear cover assembly (7). A coil winding (12) is fixedly installed on the outer edge of the transmission rod (11). A permanent magnet (13) is fixedly installed inside the outer shell (1). The coil winding (12) includes a mounting cover (1201) and a positioning post (1202). A winding coil (1203) is fixedly mounted on the outer edge of the positioning post (1202). A positioning groove (1205) is provided at one end of the winding coil (1203) near the rear cover assembly (7). A locking post (1206) is fixedly mounted at one end of the winding coil (1203) away from the rear cover assembly (7).

2. The four-pole hollow cup motor structure according to claim 1, characterized in that: The rear cover assembly (7) includes a rear cover (701), and a bearing seat (702) and a clip (703) are fixedly installed on one end of the rear cover (701) near the outer shell (1). The clip (703) is adapted to the outer shell (1).

3. The four-pole hollow cup motor structure according to claim 1, characterized in that: The mounting cover (1201) is fixedly installed with a positioning post (1202) at one end near the rear cover assembly (7). A slot (1204) is provided through the outer edge of the winding coil (1203), and the slot (1204) corresponds one-to-one with the positioning post (1202).

4. The four-pole hollow cup motor structure according to claim 1, characterized in that: The positioning posts (1202) are provided in two identical sets, and each set of the positioning posts (1202) has two identical posts. The two sets of positioning posts (1202) are distributed in a ring about the center line of the mounting cover (1201).

5. The four-pole hollow cup motor structure according to claim 1, characterized in that: Multiple winding coils (1203) are provided, and a locking post (1206) on one winding coil (1203) is engaged with a positioning groove (1205).

6. The four-pole hollow cup motor structure according to claim 1, characterized in that: A front bearing (4) and a rear bearing (8) are fixedly installed on the outer edge of the transmission rod (11). A sealing ring 1 (5) and a sealing ring 2 (6) are provided at both ends of the transmission rod (11) located on the front bearing (4). A sealing gasket 1 (9) and a sealing gasket 2 (10) are provided at both ends of the transmission rod (11) located on the rear bearing (8).

7. The four-pole hollow cup motor structure according to claim 1, characterized in that: A locking block (2) is fixedly installed at one end of the outer shell (1) near the front cover (3). The locking block (2) is engaged with the front cover (3), and the front cover (3) and the outer shell (1) are welded together.

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