Small low-radiation high-reliability electric mechanism

Abstract

The invention discloses a small-sized low-radiation high-reliability electric mechanism. The small-sized low-radiation high-reliability electric mechanism is characterized by comprising a motor unit and a speed reducer unit, the motor unit comprises a shell assembly and a rotor assembly; the rotor assembly is rotationally arranged in the shell assembly; the shell assembly comprises a shell and a stator arranged in the shell; a middle cover is also arranged in the shell; a rear cover is arranged on the left side of the shell; the rotor assembly comprises a rotor, a rotor iron core is arranged on a shaft of the rotor, and a magnetic pole N and a magnetic pole S are uniformly and alternately bonded on the rotor iron core; a protective sleeve is arranged outside the magnetic pole; a dynamic balance ring I and a dynamic balance ring II are arranged at two ends of the rotor iron core; the left end and the right end of the rotor are matched with the middle cover and the shell through bearings respectively. A circuit board assembly and a steel sleeve assembly are arranged on the left side of the middle cover. And a rear cover inner sleeve and a rear cover nut are arranged below the left side of the rear cover. The structure is low in radiation and good in reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of motor reducers, and in particular relates to a small-sized, low-radiation and high-reliability electric mechanism. Background Art

[0002] The electric mechanism usually includes a motor and a reducer, which are connected by an intermediate component. Its performance directly affects the quality of the system. With the widespread use of electric mechanism products in more and more environments, the requirements for the miniaturization and environmental resistance of electric mechanisms are becoming more and more stringent. The electric mechanisms in the existing technology can no longer effectively meet the corresponding requirements.

[0003] Therefore, there is an urgent need for a product that has a compact structure, small size, light weight, high reliability, a sealed structure, and can meet electromagnetic compatibility requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a small, low-radiation, high-reliability electric mechanism having the advantages of compact structure, small size, light weight and high reliability, thereby solving the problems in the prior art.

[0005] The present invention is achieved through the following technical solutions: a small, low-radiation, high-reliability electric mechanism, characterized in that: it includes a motor unit and a reducer unit; the motor unit includes a housing assembly and a rotor assembly; the rotor assembly is rotatably arranged in the housing assembly; the housing assembly includes a housing and a stator arranged in the housing; an intermediate cover is also arranged in the housing; a rear cover is arranged on the left side of the housing; the rotor assembly includes a rotor, a rotor core is arranged on the shaft of the rotor, and magnetic poles N and magnetic poles S are evenly and alternately bonded on the rotor core; a protective sleeve is arranged outside the magnetic pole, and dynamic balancing rings I and dynamic balancing rings II are arranged at both ends of the rotor core; the left and right ends of the rotor are respectively matched with the intermediate cover and the housing through bearings, and a circuit board assembly and a steel sleeve assembly are arranged on the left side of the intermediate cover; a rear cover inner sleeve and a rear cover nut are arranged at the lower left side of the rear cover.

[0006] Furthermore: the motor unit and the reducer unit are fixed by radial countersunk screws, and a gear is arranged at the shaft extension end of the motor unit, and the gear is meshed with the reduction structure in the reducer.

[0007] Further: the housing of the motor unit and the housing of the reducer are both made of stainless steel.

[0008] Further: the circuit board assembly includes a circuit board, a Hall sensor and a ceramic capacitor, the Hall sensor is horizontally assembled on the circuit board; the circuit board assembly is fixed on the middle cover by screws.

[0009] Further: the steel sleeve assembly is composed of a steel sleeve and magnetic steel, the steel sleeve is alternately equipped with tile-shaped magnetic steel, and N and S are alternately assembled into a circle; the magnetization of the magnetic steel is axial magnetization; the magnetic steel cooperates with the Hall sensor in the circuit board assembly.

[0010] Furthermore: the steel sleeve assembly is fixed on the rotor assembly through a hexagonal nut, the steel sleeve assembly and the rotor assembly are circumferentially matched, and a flat structure is adopted at the matching position; a five-leaf gasket is assembled between the hexagonal nut and the steel sleeve assembly.

[0011] Furthermore: a gap is left between the steel sleeve assembly and the circuit board assembly, and the rotation position of the rotor assembly is detected by a Hall sensor on the circuit board assembly.

[0012] Furthermore: the rear cover inner sleeve is fixedly arranged on the rear cover, the rear cover nut and the rear cover inner sleeve are threadedly matched, and a sealing ring is arranged between the two.

[0013] The advantages of the present invention are as follows: in this solution, the reducer motor is directly meshed and the Hall element is horizontally assembled, which is compact in space and highly utilized; a new anti-rotation and fixing structure is designed, and a stator and rotor keyway, a protective sleeve, a hexagonal nut and a five-leaf gasket structure are adopted, and marine-resistant materials are adopted, which have good environmental resistance and improve product reliability; a multiple sealing structure is adopted to achieve the overall sealing of the electric mechanism, and a new structure of sealing ring grooves and no-dead-angle potting is adopted to achieve the overall sealing of the electric mechanism, and improve the reliability of the electric mechanism in rain, humidity, heat, salt spray and other environments; an electrically continuous shielding structure is designed to make the overall external structure of the electric mechanism electrically continuous, improve the overall shielding efficiency of the electric mechanism, perform electromagnetic shielding protection on the lead wire, and design a special connection structure between the shell and the lead wire to ensure that the electric mechanism achieves the purpose of low radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the motor unit of the present invention; Figure 3 This is a schematic diagram of the position structure of the wiring terminals of the present invention; Figure 4 is a schematic diagram of the rotor assembly structure; Figure 5 It is a schematic diagram of the rotor side structure; Figure 6 It is a schematic diagram of the steel sleeve assembly structure.

[0015] Description of the serial numbers in the figure: 1-motor unit, 2-seal ring, 3-reducer; 11-housing, 12-rotor assembly, 13-circuit board assembly, 14-middle cover, 15-rear cover, 16-sealing ring, 17-steel sleeve assembly, 18-bearing, 19-hexagonal nut, 110-rear cover inner sleeve, 111-rear cover nut, 112-sealing ring, 113-gear, 114-pressing piece, 115-yin and yang studs, 116-screws, 117-terminal; 118-stator; 121-dynamic balancing ring I, 122-protective cover, 123-rotor, 124-dynamic balancing ring II; 1231- rotor core, 1232- magnetic pole N, 1233- magnetic pole S, 1234- shaft, 1235- key; 171-Steel sleeve, 172-Magnetic steel. DETAILED DESCRIPTION

[0016] Reference Figure 1-6 The present invention provides a small-sized, low-radiation, and highly reliable electric mechanism, comprising a motor unit 1 and a reducer 3, which are connected as a whole, and a sealing ring 2 is arranged in the middle; The motor unit comprises a housing assembly and a rotor assembly 12; the rotor assembly body is rotatably arranged in the housing assembly; the housing assembly comprises a housing 11 and a stator 118 arranged in the housing; an intermediate cover 14 is also arranged in the housing; at the rear side of the housing ( Figure 2 A rear cover 15 is provided on the left side of the middle; a sealing ring 16 is provided between the rear cover and the housing; The rotor assembly includes a rotor 123, on which a rotor core 1231 is arranged on the rotor shaft 1234, and magnetic poles N1232 and magnetic poles S1233 are evenly and alternately bonded to the rotor core; a protective cover 122 is arranged outside the magnetic pole, and dynamic balancing rings I121 and II124 are arranged on both sides of the rotor core; the left and right ends of the rotor are respectively matched with the middle cover 14 and the shell 11 through bearings 18, and a circuit board assembly 13 and a steel sleeve assembly 17 are arranged on the left side of the middle cover; a rear cover inner sleeve 110 and a rear cover nut 111 are arranged at the lower left side of the rear cover.

[0017] Preferably, the middle cover is fixed on the housing by radial screws. The circuit board assembly 13 is fixed on the middle cover, and the steel sleeve assembly 17 is arranged on the rotor shaft.

[0018] Preferably, the motor unit and the reducer are fixed by radial countersunk screws, a sealing ring 2 is arranged in the middle, a gear 113 is arranged at the axial extension end of the motor unit, and the gear is directly meshed with the reduction structure in the reducer.

[0019] Preferably, the housing of the motor unit and the housing of the reducer are both made of stainless steel.

[0020] Preferably, the circuit board assembly includes a circuit board, a Hall sensor and a ceramic capacitor, and the specific connection method is the existing technology; the circuit board assembly is fixed to the middle cover 14 by screws.

[0021] Preferably, the steel sleeve assembly is composed of a steel sleeve 171 and a magnetic steel 172. The steel sleeve is alternately equipped with tile-shaped magnetic steels, and the N and S magnetic poles are alternately assembled into a circle. The magnetization of the magnetic steel is axial magnetization.

[0022] Preferably: the steel sleeve assembly is transferred and fixed on the rotor assembly, and is assembled and fixed on the rotor assembly through the hexagonal nut 19. The steel sleeve assembly and the rotor assembly are circumferentially matched, and a flat structure is adopted at the matching point to prevent relative rotation; a five-leaf gasket is assembled between the hexagonal nut and the steel sleeve assembly.

[0023] Preferably, a gap is left between the steel sleeve assembly and the circuit board assembly, and the rotation position of the rotor assembly is detected by a Hall sensor on the circuit board assembly.

[0024] Preferably: in order to improve the strength of the shield and prevent the shield from slipping out of the lead-out hole, the shield end is processed to lead out the shield wire, fixed to the middle cover by the wire pressing piece 114 and the screw 116, and finally connected to the terminal 117, and the terminal is fixed by the male and female studs 115, the outer diameter of the male and female studs is round, so as to avoid scratching when the shield wire passes through the male and female studs; Preferably, the rear cover inner sleeve is fixed or integrally arranged on the rear cover, and is in the shape of an external threaded cylinder. The rear cover nut and the rear cover inner sleeve are threadedly matched, and a sealing ring 112 is arranged between the two.

[0025] Embodiment: This embodiment is a small, low-radiation, high-reliability electric mechanism, including a motor unit, a sealing ring and a reducer. The motor unit is mainly composed of a housing assembly 11, a rotor assembly 12, a circuit board assembly 13, an intermediate cover 14, a rear cover 15, a sealing ring 16, a steel sleeve assembly 17, a bearing 18, a hexagonal nut 19, a rear cover inner sleeve 110, a rear cover nut 111, a wire pressing piece 114, a male and female stud 115, a countersunk screw and a gear 113. The circuit board assembly is mainly composed of a Hall sensor, and the steel sleeve assembly is mainly composed of a steel sleeve and a magnetic steel.

[0026] The motor unit and the reducer are fixed by radial countersunk screws. The shaft extension end of the motor unit is equipped with gears, which are directly meshed with the reducer through the gears. The housing of the motor unit and the reducer are both made of stainless steel. Circumferential grooves are designed on the mating surfaces of the two, and a sealing ring 2 is installed in the groove to ensure the sealing of the motor unit and the reducer. The close contact between the motor unit and the reducer ensures the electrical continuity between the two. The internal space is compact and has a high utilization rate.

[0027] The rotor assembly is composed of a rotor 123, a dynamic balance ring I121, a dynamic balance ring II124 and a protective sleeve 122; the rotor is composed of a rotor core 1231, a shaft 1234, a key 1235, a magnetic pole N1232 and a magnetic pole S1233. The rotor core is assembled by stacking rotor punchings and is pressed together with the rotor core by a key to prevent the rotor core from rotating radially.

[0028] The rotor core has positioning teeth, and the magnetic poles N and S are evenly and alternately bonded between adjacent positioning teeth. The magnetic poles are protected by a protective cover made of stainless steel, which has an interference fit with the rotor to prevent the magnetic poles from falling off during rotation.

[0029] The dynamic balancing rings I and II are made of stainless steel and have an interference fit with the rotor; the dynamic balancing ring ends are subjected to dynamic balancing by adopting the weight removal method.

[0030] The circuit board assembly consists of a circuit board, a Hall sensor, and a ceramic capacitor. The circuit board assembly is fixed to the middle cover by screws. The internal space of the motor is limited and the Hall element is large, so the Hall sensor is designed to lie flat. The lead wires of the circuit board assembly are wrapped with conductive cloth and fixed to the middle cover with a wire clamp. They are then shielded together with the stator lead wires and protected with heat shrink tubing. In order to improve the strength of the shield and prevent the shield from falling out of the lead-out hole, the shield end is processed and then the shield wire is led out, fixed to the middle cover by a wire pressing piece and screws, and finally connected to the terminal. The terminal is fixed with a structure of male and female studs. The outer diameter of the male and female studs is round, which avoids scratches when the shield wire passes through the male and female studs. The steel sleeve assembly consists of a steel sleeve and magnetic steel. The steel sleeve is alternately equipped with tile-shaped magnetic steel, and N and S are alternately assembled into a circle. The magnetizing direction of the magnetic steel is different from the previous one, and it is magnetized in the axial direction alone. The steel sleeve assembly is assembled and fixed on the rotor assembly through a hexagonal nut, and a five-leaf gasket is installed between the two. The five-leaf gasket is bent to prevent the hexagonal nut from loosening. The steel sleeve assembly maintains a certain distance from the circuit board assembly assembled and fixed on the middle cover, and the rotation position of the rotor assembly is detected by the Hall sensor on the circuit board assembly.

[0031] The rear cover of the motor unit is made of stainless steel. A groove along the circumference is designed at the joint with the housing assembly. A sealing ring is installed in the groove to ensure the seal between the rear cover and the housing assembly. The rear cover is fixed by screws, and the screws are tightened on the male and female studs. The housing assembly is mainly composed of a housing, a stator, a stator key and an insulating pad. The housing and the stator mating surface are designed with a keyway, and the stator key is assembled inside. The stator key prevents the stator from radial rotation, thereby improving product reliability. The lead wire of the electric mechanism is led out in the axial direction of the rear cover. The structural design of the lead wire adopts the structure of the rear cover inner sleeve and the rear cover nut. The rear cover inner sleeve is welded and fixed on the rear cover. After the shielded lead wire passes through the rear cover inner sleeve and is led out, the lead wire is covered with a sealing ring, and then the rear cover nut is tightened and assembled to the rear cover inner sleeve. Through the extrusion of the rear cover nut, the sealing ring tightens the lead wire, which plays a sealing role. At the outlet hole of the lead-out wire in the rear cover, the gap between the outlet hole and the lead-out wire is sealed with silicone rubber; The middle cover is fixed to the housing assembly by four screws evenly distributed radially. The stator side surface of the middle cover after assembly is sprayed with insulating paint to improve product reliability.

[0032] The motor unit and the reducer of the electric mechanism described in this embodiment are fixed by radial screws, and a gear is installed at the shaft extension end of the motor unit, which is directly meshed with the reduction structure in the reducer; the electric mechanism has a compact structure, and the product structure is optimized and weight reduction measures are taken during design to reduce product weight and improve space utilization; the stator and rotor both adopt a keyway anti-rotation fixing structure in structure, and a fixing ring structure is used to fix the stator axially, thereby improving the structural reliability of the electric mechanism; the sensor rotor assembly adopts a combined structure of a hexagonal nut and a five-leaf gasket to prevent the hexagonal nut from loosening; The rotor adopts a protective sleeve structure to protect the magnetic steel and prevent the magnetic steel from loosening; the materials used in the design of the electric mechanism are all marine environment-resistant materials, which can ensure the stable operation of the electric mechanism in the marine environment; the electric mechanism is sealed by a multiple sealing structure, and an annular sealing groove is designed on the mating surface between the motor unit and the reducer, and between the housing assembly and the back cover, and a sealing ring is installed in the groove to improve the sealing of the motor; the lead-out hole position is treated with potting silicone rubber, and a sealing ring groove, potting glue potting and O-ring structure are used to ensure good sealing at the lead-out line. The electrically continuous shielding structure is adopted, and the overall external structure of the electric mechanism is electrically continuous through the mechanical structures such as the back cover, the inner sleeve of the back cover, the back cover nut, and the wire pressing piece, which improves the overall shielding efficiency of the electric mechanism, provides electromagnetic shielding protection for the lead-out wire, and designs a special connection structure between the shell and the lead-out wire to ensure that the electric mechanism achieves the purpose of low radiation.

Claims

1. A small, low-radiation, high-reliability electric mechanism, characterized by: It includes a motor unit and a reducer unit; The motor unit comprises a housing assembly and a rotor assembly; the rotor assembly is rotatably arranged in the housing assembly; the housing assembly comprises a housing and a stator arranged in the housing; an intermediate cover is also arranged in the housing; a rear cover is arranged on the left side of the housing; The rotor assembly includes a rotor, a rotor core is arranged on the rotor shaft, and magnetic poles N and magnetic poles S are evenly and alternately bonded on the rotor core; a protective sleeve is arranged outside the magnetic pole, and dynamic balancing rings I and II are arranged at both ends of the rotor core; the left and right ends of the rotor are respectively matched with the middle cover and the shell through bearings, and a circuit board assembly and a steel sleeve assembly are arranged on the left side of the middle cover; a rear cover inner sleeve and a rear cover nut are arranged at the lower left side of the rear cover.

2. According to claim 1, a small-sized, low-radiation, high-reliability electric mechanism is characterized by: The motor unit and the reducer unit are fixed by radial countersunk screws. A gear is arranged at the shaft extension end of the motor unit, and the gear is meshed with the reduction structure in the reducer.

3. According to claim 1, a small-sized, low-radiation, high-reliability electric mechanism is characterized by: The housing of the motor unit and the reducer housing are both made of stainless steel.

4. According to claim 1, a small-sized, low-radiation, high-reliability electric mechanism is characterized by: The circuit board assembly comprises a circuit board, a Hall sensor and a ceramic capacitor. The Hall sensor is horizontally assembled on the circuit board. The circuit board assembly is fixed on the middle cover by screws.

5. According to claim 1, a small-sized, low-radiation, high-reliability electric mechanism is characterized by: The steel sleeve assembly consists of a steel sleeve and magnetic steel. The steel sleeve is alternately equipped with tile-shaped magnetic steel, and N and S are alternately assembled into a circle; the magnetization of the magnetic steel is axial magnetization; the magnetic steel cooperates with the Hall sensor in the circuit board assembly.

6. A small-sized, low-radiation, high-reliability electric mechanism according to claim 1, characterized in that: The steel sleeve assembly is fixed to the rotor assembly through a hexagonal nut. The steel sleeve assembly and the rotor assembly are circumferentially matched, and a flat structure is adopted at the matching position; a five-leaf gasket is assembled between the hexagonal nut and the steel sleeve assembly.

7. A small-sized, low-radiation, high-reliability electric mechanism according to claim 1, characterized in that: A gap is left between the steel sleeve assembly and the circuit board assembly, and the rotation position of the rotor assembly is detected by a Hall sensor on the circuit board assembly.

8. The small-sized, low-radiation, high-reliability electric mechanism according to claim 1, characterized in that: The rear cover inner sleeve is fixedly arranged on the rear cover, the rear cover nut and the rear cover inner sleeve are threadedly matched, and a sealing ring is arranged between the two.

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