A three-phase permanent magnet direct current brushless motor

Abstract

The utility model relates to a kind of three-phase permanent magnet DC brushless motor, comprising: shell, fixedly connected in the stator of shell and rotationally connected in the rotor of shell, further comprising: fixed cover, three electrically conductive rings, three-phase wire, rotating cover and the electrically conductive column corresponding to electrically conductive ring, fixed cover is fixedly connected on the lateral wall of shell, three electrically conductive rings are all fixedly connected on fixed cover, and the circumferential center of three electrically conductive rings is overlapped, three electrically conductive rings diameter then gradually reduces inwards in turn, and the three electrically conductive rings are electrically connected with stator respectively, rotating cover is rotationally connected on fixed cover, electrically conductive column is fixedly connected on rotating cover, and one end is slidably connected with electrically conductive column, electrically conductive column can rotate along the circumferential direction of electrically conductive ring, one end of electrically conductive column is fixedly connected with three-phase wire output end, reduce the metal fatigue fracture and insulation layer abrasion caused by repeated torsion in wire winding position.

Description

Technical Field

[0001] This utility model relates to the technical field of three-phase permanent magnet brushless DC motors, and in particular to a three-phase permanent magnet brushless DC motor. Background Technology

[0002] Traditional three-phase permanent magnet brushless DC motors employ a housing-enclosed structure, containing a stator core assembly arranged in a circumferential array. This assembly is rigidly connected to the housing via interference fit or bolt fastening. The rotor consists of permanent magnets and a shaft forming a single rotating unit, radially positioned via rolling bearings in the front and rear end covers. The three-phase power supply wires are stranded bundles, introduced through the housing's through-holes and directly wound around the stator winding terminals. This open connection method has the following mechanical drawbacks:

[0003] 1. Weak point in wire harness fixation: No wire stress relief mechanism is set up. When the motor body needs to adjust the installation angle due to working conditions, torsional load will be generated at the entanglement of the wire harness and the stator terminal. Long-term action may lead to fatigue fracture of the metal terminal or wear of the insulation layer.

[0004] 2. Lack of anti-rotation protection: The wiring holes in the housing are smooth through-holes, leaving a gap between the wire harness and the hole wall. Under equipment vibration or external pulling conditions, the wire harness is prone to circumferential displacement, which in turn causes the internal terminals to generate rotational torque. Utility Model Content

[0005] The purpose of this invention is to solve the problems in the prior art and to propose a three-phase permanent magnet brushless DC motor that can reduce wire bundle breakage.

[0006] To achieve the above objectives, this utility model proposes a three-phase permanent magnet brushless DC motor, comprising: a housing, a stator fixedly connected within the housing, and a rotor rotatably connected within the housing, characterized in that...

[0007] It also includes: a fixed cover, three conductive rings, three-phase wires, a rotating cover, and conductive posts corresponding to the conductive rings;

[0008] The fixed cover is fixedly connected to the side wall of the housing, and the three conductive rings are all fixedly connected to the fixed cover. The centers of the three conductive rings overlap, and the diameters of the three conductive rings gradually decrease inward. The three conductive rings are electrically connected to the stator respectively.

[0009] The rotating cover is rotatably connected to the fixed cover, the conductive post is fixedly connected to the rotating cover, and one end is slidably connected to the conductive post. The conductive post can rotate along the circumference of the conductive ring.

[0010] One end of the conductive post is fixedly connected to the output end of the three-phase wire.

[0011] Preferably, the rotating cover includes two connecting covers, which are detached and fixed together by bolts, and the connecting covers are rotatably connected to the top surface of the fixed cover.

[0012] Preferably, an L-shaped limiting ring is detachably connected to the fixed cover, and a rotating ring is fixedly connected to the bottom surface of the connecting cover, with the limiting ring and the top surface of the rotating ring in contact.

[0013] Preferably, a fixed slider is elastically slidably connected to the side wall of the limiting ring away from the rotating ring, and a fixed groove is provided on the fixed cover for the fixed slider to enter.

[0014] Preferably, a ball bearing is rotatably connected to the limiting ring, and the ball bearing is in contact with the top surface of the rotating ring.

[0015] Preferably, an insulating block is provided between adjacent guide rings, and one end of the insulating block is fixedly connected to the top surface of the fixed cover.

[0016] Preferably, one of the connecting covers is fixedly connected to a positioning rod, and the other connecting cover is provided with a positioning groove for the positioning rod to enter.

[0017] Compared with existing technologies, the advantages of this invention are as follows: This invention, through the sliding contact design of the conductive post and the concentric conductive ring, completely reduces the inherent torsional load problem of traditional wire harness connections. When the motor installation angle needs to be adjusted, the rotating cover drives the conductive post to slide freely along the circumference of the conductive ring, so that the external cable and the internal winding form dynamic isolation, reducing metal fatigue fracture and insulation wear caused by repeated torsion at the wire winding part.

[0018] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the position of the stator of this utility model;

[0021] Figure 3 This is a schematic diagram showing the position of the fixed slider of this utility model;

[0022] Figure 4 This is a schematic diagram showing the position of the positioning rod of this utility model.

[0023] In the diagram: 1. Housing; 2. Stator; 3. Rotor; 4. Fixing cover; 5. Conductive ring; 6. Three-phase wire; 7. Rotating cover; 8. Conductive column; 9. Connecting cover; 10. Limiting ring; 11. Rotating ring; 12. Fixing slider; 13. Fixing groove; 14. Ball bearing; 15. Insulating block; 16. Positioning rod; 17. Positioning groove. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] A three-phase permanent magnet brushless DC motor includes: a housing, a stator fixedly connected within the housing, and a rotor rotatably connected within the housing.

[0029] The motor in this utility model also includes: a fixed cover, three conductive rings, three-phase wires, a rotating cover, and conductive posts corresponding to the conductive rings;

[0030] The fixed cover is fixedly connected to the side wall of the housing. Three conductive rings are fixedly connected to the fixed cover, and the centers of the three conductive rings overlap. The diameters of the three conductive rings gradually decrease inward. The three conductive rings are electrically connected to the stator. The rotating cover is rotatably connected to the fixed cover. The conductive post is fixedly connected to the rotating cover, and one end of the conductive post is slidably connected to the conductive post. The conductive post can rotate along the circumference of the conductive ring. One end of the conductive post is fixedly connected to the output end of the three-phase wire. Therefore, when the operator rotates the motor to adjust the position, the rotating cover rotates, and the rotation of the rotating cover drives the conductive post to rotate inside the conductive ring.

[0031] Specifically, the rotating cover includes two connecting covers, which are detached and fixed together by bolts. The connecting covers are rotatably connected to the top surface of the fixed cover. By unscrewing the bolts and removing the connecting covers, they can be disassembled so that personnel can separate the connecting covers from the fixed cover. One of the connecting covers is fixedly connected to a positioning rod, and the other connecting cover has a positioning groove for the positioning rod to enter. The positioning rod enters the positioning groove to be used for positioning between the two connecting covers.

[0032] Specifically, an L-shaped limiting ring is detachably connected to the fixed cover, and a rotating ring is fixedly connected to the bottom surface of the connecting cover. The limiting ring and the top surface of the rotating ring are in contact, and a ball is rotatably connected to the limiting ring. The ball is in contact with the top surface of the rotating ring. The limiting ring is used to limit the rotating ring, thereby indirectly limiting the connecting cover, while the ball is used to reduce the friction between the limiting ring and the rotating ring.

[0033] Specifically, a fixed slider is elastically slidably connected to the side wall of the limiting ring away from the rotating ring. A fixed groove is provided on the fixed cover for the fixed slider to enter. An insulating block is provided between adjacent guide rings. One end of the insulating block is fixedly connected to the top surface of the fixed cover. The fixed slider is elastically slidably connected by a spring. The spring is fixedly connected to the limiting ring, and one end is fixedly connected to the fixed slider. Therefore, the spring will cause the fixed slider to enter the fixed groove, thereby achieving the fixation of the limiting ring.

[0034] The principle of this invention is as follows: When the motor is working, the external DC power supply is converted into three-phase AC power by the controller and transmitted to the conductive posts through three-phase wires. The conductive posts are rigidly connected to the rotating cover, and their ends always maintain sliding contact with the corresponding conductive rings. Three concentrically arranged conductive rings are respectively connected to the three-phase stator windings, forming U, V, and W phase current paths. When the permanent magnet of the motor rotor rotates, the rotating magnetic field generated by the stator windings interacts with the permanent magnet magnetic field of the rotor, driving the rotor to rotate continuously. The rotating cover adopts a double-connecting cover interlocking design, and the positioning rod and positioning groove ensure assembly accuracy. The rotating ring and the limiting ring set inside form axial constraints, and the ball structure effectively reduces rotational friction. The limiting ring is quickly disassembled and assembled by embedding a spring-loaded fixed slider into the sliding groove of the fixed cover, and the insulating block ensures electrical isolation between adjacent conductive rings. When adjusting the motor installation angle, the external force drives the rotating cover to move the conductive posts along the circumference of the conductive rings. Since the conductive rings are fixedly connected to the stator windings, and the conductive posts are relatively stationary with respect to the external cables, the motor can maintain stable power supply at any rotation position, realizing the synchronous completion of mechanical angle adjustment and power transmission.

[0035] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A three-phase permanent magnet brushless DC motor, comprising: The housing (1), the stator (2) fixedly connected within the housing (1), and the rotor (3) rotatably connected within the housing (1) are characterized in that, It also includes: a fixed cover (4), three conductive rings (5), three-phase wires (6), a rotating cover (7), and conductive posts (8) corresponding to the conductive rings (5); The fixed cover (4) is fixedly connected to the side wall of the housing (1), and the three conductive rings (5) are all fixedly connected to the fixed cover (4). The three conductive rings (5) overlap in circumference, and the diameters of the three conductive rings (5) gradually decrease inward. The three conductive rings (5) are electrically connected to the stator (2) respectively. The rotating cover (7) is rotatably connected to the fixed cover (4), the conductive post (8) is fixedly connected to the rotating cover (7), and one end is slidably connected to the conductive post (8). The conductive post (8) can rotate along the circumference of the conductive ring (5). One end of the conductive post (8) is fixedly connected to the output end of the three-phase wire (6).

2. A three-phase permanent magnet brushless DC motor according to claim 1, characterized in that, The rotating cover (7) includes two connecting covers (9), which are fixed together by bolts and are rotatably connected to the top surface of the fixed cover (4).

3. A three-phase permanent magnet brushless DC motor according to claim 2, characterized in that, An L-shaped limiting ring (10) is detachably connected to the fixed cover (4), and a rotating ring (11) is fixedly connected to the bottom surface of the connecting cover (9). The limiting ring (10) is in contact with the top surface of the rotating ring (11).

4. A three-phase permanent magnet brushless DC motor according to claim 3, characterized in that, A fixed slider (12) is elastically slidably connected to the side wall of the limiting ring (10) away from the rotating ring (11), and a fixed groove (13) is provided on the fixed cover (4) for the fixed slider (12) to enter.

5. A three-phase permanent magnet brushless DC motor according to claim 4, characterized in that, A ball bearing (14) is rotatably connected to the limiting ring (10), and the ball bearing (14) is in contact with the top surface of the rotating ring (11).

6. A three-phase permanent magnet brushless DC motor according to claim 1, characterized in that, An insulating block (15) is provided between adjacent conductive rings, and one end of the insulating block (15) is fixedly connected to the top surface of the fixing cover (4).

7. A three-phase permanent magnet brushless DC motor according to claim 2, characterized in that, One of the connecting covers (9) is fixedly connected to a positioning rod (16), and the other connecting cover (9) is provided with a positioning groove (17) for the positioning rod (16) to enter.

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