Coreless stator motor

Abstract

The utility model discloses a coreless stator motor, which comprises a motor mounting base, a stator system, a rotor system and a planetary gear transmission system, the stator system comprises a stator support circular track and a plurality of winding units, the stator support circular track is fixedly mounted on the motor mounting base, and the inner circumferential surface of the stator support circular track is provided with a radially recessed annular groove; each winding unit comprises a winding supporting framework and a stator winding, the periphery of the stator supporting ring rail is sleeved with the winding supporting framework, and the stator winding is wound on the winding supporting framework; and the rotor system is rotationally arranged in the annular groove and is in transmission connection with the power input end of the planetary gear transmission system. The overall structure is compact. Through the combination of an odd number of groups of dielectric isolation blocks and permanent magnet units, the air gap flux density uniformity is improved. High-torque transmission of power is achieved through a planetary gear transmission system, and energy loss is reduced. And each group of planet gears corresponds to one group of stator windings, so that the overall operation is stable.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a coreless stator motor. Background Technology

[0002] Traditional electric motors typically employ an iron-core stator structure, which suffers from high iron losses, low efficiency, and heavy weight. While coreless stator motors can reduce iron losses, current technologies exhibit complex overall structures and struggle to achieve a compact layout while maintaining high transmission efficiency, making them unsuitable for applications with tight space constraints. Furthermore, existing planetary gear transmission systems used in coreless motors suffer from insufficient vibration suppression and uneven magnetic flux distribution. Therefore, there is an urgent need for a coreless stator motor to optimize the overall structural layout and achieve efficient and stable operation. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a coreless stator motor.

[0004] The technical solution of this utility model is as follows: it includes a motor mounting base, a stator system, a rotor system, and a planetary gear transmission system. The stator system includes a stator support ring rail and several winding units. The stator support ring rail is fixedly installed on the motor mounting base, and its inner circumferential surface is provided with a radially recessed annular groove. Each winding unit includes a winding support frame and a stator winding. The winding support frame is sleeved on the outer circumference of the stator support ring rail, and the stator winding is wound on the winding support frame. The rotor system is rotatably disposed in the annular groove and is connected to the power input end of the planetary gear transmission system.

[0005] A further technical solution is as follows: the rotor system includes a bearing ring and an annular magnetic yoke, the bearing ring is embedded in an annular groove, and the outer circumferential surface of the annular magnetic yoke contacts the inner circumferential surface of the bearing ring to form a sliding bearing pair.

[0006] A further technical solution is that the annular magnetic yoke is provided with an axially recessed receiving cavity, and a permanent magnet unit is embedded in the receiving cavity.

[0007] A further technical solution is that the annular magnetic yoke is provided with a recessed cavity along the axial direction, the cavity being continuously distributed along the circumference of the annular magnetic yoke, and multiple sets of alternating permanent magnet units and dielectric isolation blocks are embedded in the cavity.

[0008] A further technical solution is that the number of permanent magnet units and dielectric isolation blocks is odd, and the number of groups is ≥3.

[0009] A further technical solution is as follows: the planetary gear transmission system includes an internal gear ring disposed on the inner circumferential surface of the stator support ring, and also includes a sun gear and planet gears meshing with the sun gear, wherein the planet gears mesh with the internal gear ring.

[0010] A further technical solution is that there are multiple planetary gears, which are spaced apart around the sun gear, and each planetary gear is rotatably mounted on the stator support ring rail via a bearing.

[0011] A further technical solution is as follows: the stator support ring rail is provided with multiple planetary carriers extending toward the central axis, each planetary carrier is provided with a connecting rod extending in the same direction as the central axis, and each planetary gear is rotatably connected to the corresponding connecting rod through a bearing.

[0012] A further technical solution is that the number of planetary gears is 3 to 5 sets, and each set of planetary gears is evenly distributed around the sun gear.

[0013] A further technical solution is that the number of the winding support frame corresponds to the number of planetary gears and is evenly distributed along the circumference of the stator support ring rail.

[0014] The beneficial technical effects of this utility model are as follows: By sequentially arranging the stator system, rotor system, and planetary gear transmission system radially towards the central axis, a flattened integrated design is formed, reducing axial space occupation and resulting in a compact overall structure. The combination of odd-numbered dielectric isolation blocks and permanent magnet units improves the uniformity of air gap magnetic flux density. The planetary gear transmission system achieves high torque transmission, while the coreless stator reduces energy loss. By setting stator windings corresponding to the number of planetary gears, torque pulsation can be suppressed and electromagnetic-mechanical coupling optimized; simultaneously, each set of planetary gears corresponds to one set of stator windings, ensuring a spatially balanced distribution of the points of application of electromagnetic and mechanical forces. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall axial structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the overall radial structure of this utility model;

[0017] Figure 3 This is a utility model Figure 2 Schematic diagram of sectional view along direction AA;

[0018] Figure 4 This is an exploded view of the overall structure of this utility model;

[0019] The components are: 1. Motor mounting base; 2. Stator system; 21. Stator support ring rail; 211. Annular groove; 22. Winding support frame; 23. Stator winding; 3. Rotor system; 31. Bearing ring; 32. Annular magnetic yoke; 33. Receiving cavity; 34. Permanent magnet unit; 35. Dielectric isolation block; 4. Planetary gear transmission system; 41. Planet carrier; 42. Planet gear; 43. Sun gear; 44. Connecting rod. Detailed Implementation

[0020] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] like Figures 1 to 4 As shown, this utility model discloses a coreless stator motor, including a motor mounting base 1, a stator system 2, a rotor system 3 and a planetary gear transmission system 4. The stator system 2 is fixed to the motor mounting base 1 by a stator support ring rail 21.

[0022] Specifically, the stator support ring rail 21 is locked and fixed to the motor mounting base 1 by locking screws. The stator system 2 includes a magnetic field control circuit and several winding units. Each winding unit includes a winding support frame 22 and a stator winding 23. The winding support frame 22 is sleeved on the outer circumference of the stator support ring rail 21, and the stator winding 23 is wound on the winding support frame 22. The magnetic field control circuit is electrically connected to the stator winding 23 and is used to provide an adjustable phase drive current to the stator winding 23, so that the magnetic field changes according to a preset law.

[0023] In this embodiment, the inner circumferential surface of the stator support ring rail 21 is provided with a radially recessed annular groove 211. The cross-section of the annular groove 211 is U-shaped and continuously distributed along the inner ring of the stator support ring rail 21. The rotor system 3 achieves low-friction rotation relative to the stator support ring rail 21 through the bearing ring 31.

[0024] Specifically, the bearing ring 31 has a closed annular structure and is fitted into the annular groove 211. The bearing ring 31 is made of a self-lubricating material; preferably, the bearing ring 31 is made of graphite-filled polytetrafluoroethylene material.

[0025] The rotor system 3 is used to convert the alternating magnetic field energy generated by the stator winding 23 into mechanical energy. The rotor system 3 includes an annular magnetic yoke 32, the outer peripheral surface of which contacts the inner peripheral surface of the bearing ring 31 to form a sliding bearing pair, enabling the annular magnetic yoke 32 to rotate around the central axis of the stator support ring rail 21. Preferably, the annular magnetic yoke 32 is made of a high-strength composite material, such as carbon fiber reinforced polymer.

[0026] The annular magnetic yoke 32 is provided with a recessed cavity 33 along the axial direction. The cavity 33 is continuously distributed along the circumference of the annular magnetic yoke 32. Several permanent magnet units 34 are embedded in the cavity 33. The magnetization direction of each permanent magnet unit 34 is arranged according to a preset rule (such as a Halbach array) to optimize the air gap magnetic flux density distribution.

[0027] Adjacent permanent magnet units 34 are magnetically isolated by dielectric isolation blocks 35. Preferably, the dielectric isolation blocks 35 are epoxy resin isolation blocks to effectively block the leakage magnetic path between permanent magnet units 34 and avoid magnetic short circuits; at the same time, the tensile strength and bonding strength of the epoxy resin isolation blocks can withstand the centrifugal force during high-speed rotation, preventing displacement of the permanent magnet units 34.

[0028] In this embodiment, five groups of permanent magnet units 34 are used, and five groups of dielectric isolation blocks 35 are correspondingly provided. The five groups of permanent magnet units 34 form an asymmetrical layout, which suppresses specific order vibrations and reduces the risk of resonance. Moreover, the five-pole structure design of the permanent magnet can achieve an approximately sinusoidal magnetic field distribution and reduce torque pulsation; at the same time, when the odd number of poles (five poles) is combined with the Halbach array, a more uniform air gap magnetic flux density can be generated.

[0029] In use, the stator winding 23 generates an alternating magnetic field that rotates circumferentially under energized excitation. This alternating magnetic field drives each segmented permanent magnet unit 34 to rotate, while the annular yoke 32 rotates around the central axis of the stator support ring rail 21 under the rotational drive of the permanent magnet unit 34. The power of its rotation is output through the planetary gear transmission system 4.

[0030] The planetary gear transmission system 4 includes a planet carrier assembly fixed to the stator support ring rail 21, multiple planet gears 42, and a sun gear 43. The planet carrier assembly includes multiple planet carriers 41 extending along the central axis of the stator support ring rail 21, and each planet carrier 41 is provided with a connecting rod 44 extending in the same direction as the central axis. The multiple planet gears 42 mesh with internal gear rings 45 provided on the inner circumference of the stator support ring rail 21, and are rotatably mounted on the corresponding connecting rods 44 through bearings. The sun gear 43 meshes with each planet gear 42, and the rotational power of the annular magnetic yoke 32 is transmitted to the sun gear 43 through each planet gear 42, and finally output to the external load.

[0031] The planetary gears 42 can be provided in 3 to 5 sets according to the actual working conditions. Each set of planetary gears 42 is rotatably mounted on the corresponding tie rod 44 of the planetary carrier 41 assembly through bearings. The 3 to 5 sets of winding support frames 22 corresponding to the number of planetary gears 42 are evenly distributed on the stator support ring rail 21 in the circumferential direction to achieve electromagnetic-mechanical coupling optimization.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A coreless stator motor, comprising a motor mounting base (1), a stator system (2), a rotor system (3), and a planetary gear transmission system (4), characterized in that: The stator system (2) includes a stator support ring rail (21) and several winding units. The stator support ring rail (21) is fixedly installed on the motor mounting base (1), and its inner circumferential surface is provided with a radially recessed annular groove (211). Each winding unit includes a winding support frame (22) and a stator winding (23). The winding support frame (22) is sleeved on the outer periphery of the stator support ring rail (21), and the stator winding (23) is wound on the winding support frame (22). The rotor system (3) is rotatably disposed in the annular groove (211) and is connected to the power input end of the planetary gear transmission system (4).

2. The coreless stator motor according to claim 1, characterized in that: The rotor system (3) includes a bearing ring (31) and an annular magnetic yoke (32). The bearing ring (31) is embedded in an annular groove (211). The outer circumferential surface of the annular magnetic yoke (32) is in contact with the inner circumferential surface of the bearing ring (31) and forms a sliding bearing pair.

3. A coreless stator motor according to claim 2, characterized in that: The annular magnetic yoke (32) is provided with an axially recessed receiving cavity (33), and a permanent magnet unit (34) is embedded in the receiving cavity (33).

4. A coreless stator motor according to claim 2, characterized in that: The annular magnetic yoke (32) is provided with a recessed cavity (33) along the axial direction. The cavity (33) is continuously distributed along the circumference of the annular magnetic yoke (32). Multiple sets of alternating permanent magnet units (34) and dielectric isolation blocks (35) are embedded in the cavity (33).

5. A coreless stator motor according to claim 4, characterized in that: The number of permanent magnet units (34) and dielectric isolation blocks (35) is odd, and the number of groups is ≥3.

6. A coreless stator motor according to claim 1, characterized in that: The planetary gear transmission system (4) includes an internal gear ring (45) disposed on the inner circumferential surface of the stator support ring rail (21), and also includes a sun gear (43) and planet gears (42) meshing with the sun gear (43), wherein the planet gears (42) mesh with the internal gear ring (45).

7. A coreless stator motor according to claim 6, characterized in that: The number of planetary gears (42) is multiple, and the multiple planetary gears (42) are arranged at intervals around the sun gear (43). Each planetary gear (42) is rotatably mounted on the stator support ring rail (21) through a bearing.

8. A coreless stator motor according to claim 7, characterized in that: The stator support ring rail (21) is provided with multiple planetary carriers (41) extending toward the central axis. Each planetary carrier (41) is provided with a connecting rod (44) extending in the same direction as the central axis. Each planetary gear (42) is rotatably connected to the corresponding connecting rod (44) through a bearing.

9. A coreless stator motor according to claim 7, characterized in that: The number of planetary gears (42) is 3 to 5 sets, and each set of planetary gears (42) is evenly distributed around the sun gear (43).

10. A coreless stator motor according to claim 9, characterized in that: The number of winding support frames (22) corresponds to the number of planetary gears (42) and is evenly distributed circumferentially along the stator support ring (21).

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