Mining DC permanent magnet drive micro motor

Abstract

This utility model discloses a DC permanent magnet driven micro motor for mining, relating to the field of motor technology. It aims to solve the problem of difficulty in meeting explosion-proof requirements and posing significant safety hazards in environments containing explosive gases such as methane. The motor includes a casing and stator assembly, rotor assembly, control elements, cables, threaded connectors, gaskets, and sealing rings. By converting it to a low-voltage DC motor, compared to traditional three-phase asynchronous motors, it significantly reduces the risk of electric shock and other safety hazards, resulting in a substantial improvement in safety performance. Compared to bulky three-phase asynchronous motors, this motor, through its low-voltage DC design and L-shaped casing cross-section, shortens the overall length while ensuring sufficient internal component installation space, achieving a miniaturized design. This allows it to better adapt to space-constrained scenarios in mining equipment, such as the lubrication systems of methane pump stations and water pump rooms.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a DC permanent magnet drive micro motor for mining. Background Technology

[0002] In harsh environments such as mining operations, various equipment places extremely high demands on the reliability, sealing, miniaturization, and explosion-proof safety of drive motors. Traditional mining drive motors mostly use three-phase asynchronous motors. These motors are bulky and have poor compatibility in space-constrained environments such as lubrication systems in mining equipment. Furthermore, their safety performance is inadequate; in environments containing explosive gases such as methane, they fail to meet explosion-proof requirements, posing significant safety hazards. Moreover, traditional motors are mostly of the excitation type, requiring excitation windings to generate a magnetic field, resulting in high energy losses. The complex winding structure also makes them prone to failure in dusty and humid environments.

[0003] Therefore, this application provides a micro DC permanent magnet drive motor for mining to meet the requirements. Utility Model Content

[0004] The purpose of this application is to provide a DC permanent magnet driven micro motor for mining, which aims to solve the problem that it is difficult to meet explosion-proof requirements in environments containing explosive gases such as methane, which poses a great safety hazard.

[0005] To achieve the above objectives, this application provides the following technical solution: a mining DC permanent magnet drive micro motor, including a body and stator assembly, a rotor assembly, control elements, cables, threaded joints, gaskets, and sealing rings; The fuselage also includes a front cover and a housing, and a rear cover. The housing has an L-shaped structure with an L-section, and a front cover and a rear cover are respectively provided at the front and rear ends of the housing. The stator assembly and rotor assembly are housed inside the housing. The control element is connected to the stator assembly and rotor assembly. The cable is inserted into the housing, with one end connected to the control element and the other end led out through a threaded connector. Washers and seals are placed at the connection between the threaded connector and the housing.

[0006] Preferably, the stator assembly is a permanent magnet stator assembly.

[0007] Preferably, the control element includes a control circuit for controlling the motor speed and direction.

[0008] Preferably, the sealing ring is a rubber sealing ring.

[0009] Preferably, the front cover and the rear cover are connected to the housing by bolts.

[0010] In summary, the technical effects and advantages of this utility model are as follows: This invention, by replacing the motor with a low-voltage DC motor, significantly reduces the safety risks such as electric shock compared to traditional three-phase asynchronous motors, and significantly improves safety performance. Compared to bulky three-phase asynchronous motors, this motor, through its low-voltage DC design and special L-shaped casing structure, shortens the overall length while ensuring sufficient space for internal component installation, achieving a miniaturized design. This makes it better suited for space-constrained scenarios in mining equipment, such as the lubrication systems of gas pump stations and water pump rooms.

[0011] This invention, through the built-in and integrated speed and direction control circuits of the control element, can directly receive external commands and adjust current parameters via cable, resulting in a faster response speed and significantly improved operability compared to traditional three-phase asynchronous motors. Furthermore, the modular overall structure, with detachable connections between the front and rear covers and the housing, facilitates compatibility and installation with valve switching control in the lubrication systems of various mining equipment (such as belt conveyors, scraper conveyors, coal mining machines, and tunneling machines). Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic cross-sectional view of section AA of the present invention; Figure 3 This is a side view of the present invention.

[0014] In the diagram: 1. Front cover; 2. Housing; 3. Stator assembly; 4. Rotor assembly; 5. Control element; 6. Cable; 7. Threaded connector; 8. Washer; 9. Sealing ring; 10. Rear cover. Detailed Implementation

[0015] 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.

[0016] Example: Reference Figure 1-3The shown mining DC permanent magnet drive micro motor includes a housing and stator assembly 3, rotor assembly 4, and control element 5. The stator assembly 3 and rotor assembly 4 are installed inside the housing, and the control element 5 is provided on one side. The control element 5 protrudes from the housing through a connecting cable 6.

[0017] As one embodiment of this invention, the housing 2 is made of high-strength alloy material, possesses explosion-proof performance, and has an L-shaped cross-section. Its transverse section is used to accommodate the stator assembly 3 and the rotor assembly 4, while the longitudinal section reserves a mounting cavity for the control element 5. The overall structure ensures both strength and reduces volume, resulting in a significant reduction in size compared to traditional three-phase asynchronous motors. The front and rear ends of the housing 2 are respectively provided with flange faces with bolt holes for connecting the front cover 1 and the rear cover 10, and the connection between the housing and the end covers meets the protection requirements of explosion-proof enclosure "d".

[0018] In one embodiment of this invention, the stator assembly 3 and rotor assembly 4 are configured as follows: The stator assembly 3 is a permanent magnet stator, consisting of an annular permanent magnet and a fixed bracket. It is fixed to the inner wall of the transverse section of the housing 2 by an interference fit to ensure magnetic field stability. The rotor assembly 4 includes an armature winding and a shaft. The two ends of the shaft are respectively mounted in the bearing seats of the front end cover 1 and the rear end cover 10 via bearings, and maintain an air gap of 0.2-0.5mm with the stator assembly 3 to avoid friction and ensure electromagnetic induction efficiency. This brushless DC design makes the motor operation more stable and enhances its controllability.

[0019] As one implementation method in this embodiment, the control element 5 is integrated on a circuit board and includes a current regulation module, a direction control module and a protection circuit. It is fixed in the mounting cavity of the longitudinal section of the housing 2 by screws. Its input end is connected to the cable 6 through wires, and its output end is connected to the armature winding of the rotor assembly 4 through brushes. It can adjust the current magnitude and direction in real time to achieve precise control of the motor speed and direction. Compared with the traditional three-phase asynchronous motor, the controllability is greatly improved.

[0020] As one implementation method in this embodiment, the sealing and lead-out structure is as follows: the cable 6 is a mining flame-retardant cable, one end of which passes through the reserved hole in the longitudinal section of the housing 2 and is welded to the control element 5, and the other end is led out through the threaded connector 7; the threaded connector 7 and the connection hole of the housing 2 are threaded together, and a metal washer 8 and a rubber sealing ring 9 are sequentially fitted in between. After tightening the threaded connector 7, the washer 8 can prevent the sealing ring 9 from being over-compressed, and the sealing ring 9 fills the gap through elastic deformation to achieve double sealing, ensuring explosion-proof performance and overall sealing performance.

[0021] As one implementation method in this embodiment, the end cap connection is as follows: both the front end cap 1 and the rear end cap 10 are made of cast iron and have explosion-proof performance. The inner side is provided with a sealing groove that matches the flange surface of the housing and has a built-in nitrile rubber sealing ring. The M6 ​​bolts are tightened evenly to ensure that there are no gaps on the mating surface, further blocking the intrusion path of external impurities, while meeting the explosion-proof requirements.

[0022] The working principle of this utility is as follows: Before use, the cable (6) is properly connected to the external power supply and control equipment through the threaded connector (7). The gasket (8) and sealing ring (9) can ensure that the connection is well sealed and prevent dust, moisture and other substances in the mining environment from affecting the circuit connection. After the external power supply is turned on, the current flows into the motor through the cable (6) and first reaches the control element (5). The control circuit in the control element (5) processes and regulates the current, such as adjusting the magnitude and direction of the current according to the set operating parameters; The appropriate current, after being processed by the control element (5), is delivered to the armature winding on the rotor assembly (4). When the current passes through the armature winding, under the action of the magnetic field generated by the permanent magnet in the stator assembly (3), the conductors in the armature winding are subjected to electromagnetic force according to the principle of electromagnetic induction (left-hand rule). These electromagnetic forces form electromagnetic torque, which drives the rotor assembly (4) to start rotating, thereby driving the load equipment connected to the motor shaft to operate and completing the motor starting process.

[0023] Inside the housing (2), the stator assembly (3) is first precisely installed to ensure its accurate position and firm fixation, so as to ensure that the magnetic field generated by the permanent magnet is stable and uniform. Then the rotor assembly (4) is coaxially installed inside the stator assembly (3) to ensure that the air gap between the two meets the design requirements. If the air gap is too large, it will affect the motor performance; if it is too small, it may cause the rotor to rub against the stator and damage the motor. The front cover (1) and the rear cover (10) are connected to the housing (2) by bolts. During installation, it is necessary to ensure that the bolt tightening torque is uniform to avoid deformation of the end cover due to uneven force, which would affect the sealing of the motor and the normal operation of the internal components. At the same time, sealant or sealing rings are usually provided on the mating surface between the end cover and the housing to further enhance the sealing effect and prevent external impurities from entering. The control element (5) is usually installed in a suitable position inside the housing (2) and reliably fixed by fasteners to prevent damage from vibration during motor operation. The cable (6) should be neatly arranged inside the motor to avoid interference with other components, and the cable connection should be secure to prevent loosening and poor contact.

[0024] The electromechanical connections involved in this utility model are common practices used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments; they are common knowledge.

[0025] Components not described in detail in this article are existing technologies.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A micro DC permanent magnet driven motor for mining, characterized in that: Includes fuselage and stator assembly (3), rotor assembly (4), control elements (5), cables (6), threaded joints (7), gaskets (8), and sealing rings (9); The fuselage also includes a front cover (1), a housing (2), and a rear cover (10). The housing (2) has an L-shaped structure with an L-section, and the front cover (1) and the rear cover (10) are respectively provided at the front and rear ends of the housing (2). The stator assembly (3) and rotor assembly (4) are disposed inside the housing (2). The control element (5) is connected to the stator assembly (3) and rotor assembly (4). The cable (6) is inserted into the housing (2), with one end connected to the control element (5) and the other end led out through the threaded connector (7). The gasket (8) and sealing ring (9) are disposed at the connection between the threaded connector (7) and the housing (2).

2. The mining DC permanent magnet drive micro motor according to claim 1, characterized in that: The stator assembly (3) is a permanent magnet stator assembly.

3. The mining DC permanent magnet drive micro motor according to claim 1, characterized in that: The control element (5) includes a control circuit for controlling the motor speed and direction.

4. The mining DC permanent magnet drive micro motor according to claim 1, characterized in that: The sealing ring (9) is a rubber sealing ring.

5. The mining DC permanent magnet drive micro motor according to claim 1, characterized in that: The front cover (1) and the rear cover (10) are connected to the housing (2) by bolts.

Images