Plastic package integrated single-bearing motor

Abstract

The invention discloses a plastic package integrated single-bearing motor, and relates to the technical field of motors, the plastic package integrated single-bearing motor comprises a casing, a rear end cover, a wire clamp, a front end cover, a stator assembly and a rotor assembly, the casing is internally provided with a stator accommodating cavity, the inner side of the stator accommodating cavity is provided with a rotor accommodating cavity, the stator assembly is arranged in the stator accommodating cavity, and the rotor assembly is arranged in the rotor accommodating cavity. Compared with a traditional plastic package motor, the motor has the advantages that a single-bearing structure is adopted, the rotor assembly is sleeved with the bearing, the bearing is located between the stator assembly and the rotor assembly, a hollow structure is formed, a shaft is not connected, the structure is simplified, and the overall weight of the motor is reduced; and the motor operation stability is improved, the raw material cost is reduced, the installation is more convenient, the motor is suitable for large-scale automatic production, the labor cost and the time cost in the production process can be reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a plastic-encapsulated single-bearing motor. Background Art

[0002] Plastic encapsulated motors use plastic encapsulation technology to encapsulate the stator core, windings, etc. of the motor as a whole with engineering plastics, which can eliminate the traditional motor stator insulation treatment process and the metal casing of ordinary motors. This kind of micro motor is used in household appliances such as vacuum cleaners, range hoods, air conditioners, washing machines, and instrument fans.

[0003] The plastic-encapsulated motor consists of a plastic-encapsulated stator, shaft, rotor, bearing, end cover, thermal protector, lead wire, socket, etc. The stator core of the plastic-encapsulated motor is made of two semicircular cores assembled into a full circle. The semicircular core is made of high-quality cold-rolled silicon steel sheets on a high-speed punch press with a carbide progressive die, and then punched and laminated into a semicircular core by FASTEC or VICS self-buckled core. After the semicircular core is made, two semicircular insulating sheaths are respectively put on the two ends of the semicircular core, and then the wires are wound and assembled, and then it can be plastic-encapsulated. When plastic-encapsulating, the stator core and lead wires with embedded coils are first loaded into the metal mold for injection molding, and then injection molding is performed.

[0004] Plastic-encapsulated motors use the principle of electromagnetic induction to convert electrical energy into mechanical energy. When current passes through the motor's coil, a magnetic field is generated, which interacts with the magnetic field in the rotor to generate torque, causing the rotor to rotate and realize the conversion of electrical energy into mechanical energy.

[0005] Traditional plastic-encapsulated motors are generally provided with bearings on both ends of the rotating shaft and the rotor. As shown in patents CN117013721A and CN119051298A, both adopt a double-bearing structure and are sleeved on the rotating shaft. In actual use, two bearing components are required, which directly increases the cost of raw materials. At the same time, the double bearings require more precise operations and higher assembly process requirements during the installation process, which increases labor costs and time costs, thereby increasing the overall production cost. The motor structure is relatively complex, the volume is increased, and the stability is poor. In some application scenarios with strict requirements on space dimensions, such as small household appliances, portable devices, etc., the double-bearing motor may not meet the installation requirements due to its large volume. Both bearings will generate friction during the operation of the motor, thereby increasing energy loss and reducing the efficiency of the motor. In addition, the bearings may have problems such as wear, poor lubrication, and fatigue damage. Once one of the bearings fails, it will not only affect the normal operation of the motor, but may also damage the other bearing and other components of the motor, increasing the difficulty and cost of maintenance. To this end, we propose a plastic-encapsulated integrated single-bearing motor to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that traditional plastic-encapsulated motors need to use two bearing components in actual use, which directly increases the cost of raw materials, makes the motor structure relatively complex, increases the volume, increases energy loss, reduces the efficiency of the motor, and increases the difficulty and cost of maintenance, and proposes a plastic-encapsulated single-bearing motor.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technology: a plastic-encapsulated single-bearing motor: comprising a housing, a rear end cover, a wire clamp, a front end cover, a stator assembly and a rotor assembly, wherein a stator accommodating cavity is provided in the housing and a rotor accommodating cavity is provided inside the stator accommodating cavity, wherein: The stator assembly is arranged in the stator accommodating cavity, the rotor assembly is arranged in the rotor accommodating cavity, and the rotor assembly is rotatably connected to the inside of the casing; The front end cover is installed on the front side of the casing, and the rear end cover is installed on the rear side of the casing; A bearing is sleeved on one end of the outer wall of the rotor assembly, and the bearing is located between the stator assembly and the rotor assembly.

[0008] As a further description of the above technology, a plastic-encapsulated single-bearing motor is provided: the stator assembly includes a stator insulation frame, a stator core and a stator winding, the stator insulation frame is directly cast on the surface of the stator insulation frame, the stator insulation frame is provided with a stator winding, and the stator winding is arranged between the stator insulation frame and the stator core.

[0009] As a further description of the above-mentioned technology, a plastic-sealed single-bearing motor: the stator insulation frame is made of highly heat-resistant and pressure-resistant materials such as nylon.

[0010] As a further description of a plastic-encapsulated single-bearing motor of the above technology: the wire clamp is arranged on one side of the rear end cover, and the wire clamp and the rear end cover are fixed by screws.

[0011] As a further description of the above-mentioned technology, a plastic-encapsulated single-bearing motor: the rotor assembly is composed of a rotor core and a rotor winding.

[0012] As a further description of a plastic-encapsulated single-bearing motor of the above technology: the housing is injection-molded with BMC (bulk molding compound) material to form a whole with the rear end cover, the stator assembly and the wire clamp.

[0013] As a further description of the above-mentioned technology, a plastic-encapsulated single-bearing motor is provided with a plurality of mounting holes on one side of the outer wall of the rear end cover for mounting and fixing the motor. In summary, due to the use of the above-mentioned technology, a plastic-encapsulated single-bearing motor has the following beneficial effects: Compared with traditional plastic-sealed motors, the present invention adopts a single bearing structure, and the bearing sleeve is arranged on the rotor assembly and is located between the stator assembly and the rotor assembly to form a hollow structure without connecting the shaft, thereby simplifying the structure, reducing the overall weight of the motor, improving the stability of the motor operation, and reducing the cost of raw materials. The installation is more convenient and suitable for large-scale automated production, which can reduce the labor cost and time cost in the production process and improve production efficiency. The overall structure of the motor is relatively simple, small in size and light in weight, which saves installation space and is easy to install and carry. It is also conducive to the miniaturization and lightweight design of the equipment and is suitable for some application scenarios with strict requirements on space dimensions. It has strong applicability, increases the efficiency of the motor operation, and reduces the difficulty and cost of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It shows a schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of another viewing angle of the overall structure provided by an embodiment of the present invention is shown; Figure 3 It shows a schematic diagram of an exploded structure of the overall structure provided in an embodiment of the present invention; Figure 4 A schematic structural diagram of a stator assembly provided in an embodiment of the present invention is shown; Figure 5 A schematic diagram of the rear end cover structure provided according to an embodiment of the present invention is shown.

[0015] Figure numerals: 1, housing; 2, rear end cover; 3, wire clamp; 4, front end cover; 5, stator assembly; 51, stator insulation frame; 52, stator core; 53, stator winding; 6, rotor assembly; 7, bearing. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technology of a plastic-encapsulated integrated single-bearing motor in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention provides a plastic-encapsulated single-bearing motor, see Figure 1-5 As shown, it includes a housing 1, a rear end cover 2, a wire clamp 3, a front end cover 4, a stator assembly 5 and a rotor assembly 6. A stator accommodating cavity is provided in the housing 1 and a rotor accommodating cavity is provided inside the stator accommodating cavity, wherein: The stator assembly 5 is disposed in the stator accommodating cavity, the rotor assembly 6 is disposed in the rotor accommodating cavity, and the rotor assembly 6 is rotatably connected to the inside of the housing 1; The front cover 4 is installed on the front side of the housing 1, and the rear cover 2 is installed on the rear side of the housing 1; A bearing 7 is sleeved on one end of the outer wall of the rotor assembly 6 , and the bearing 7 is located between the stator assembly 5 and the rotor assembly 6 .

[0018] In the embodiment of the present application, when in use, the plastic-encapsulated integrated single-bearing motor has a working principle similar to that of a traditional motor. Based on the law of electromagnetic induction, current flows through the stator winding 53 to generate a rotating magnetic field. This magnetic field interacts with the rotor assembly 6. The rotor assembly 6 is acted upon by a force in the magnetic field and begins to rotate, thereby converting electrical energy into mechanical energy. Compared with traditional plastic-encapsulated motors, the motor adopts a single-bearing structure, and the bearing sleeve is arranged on the rotor assembly 6 and is located between the stator assembly 5 and the rotor assembly 6 to form a hollow structure without connecting the shaft, thereby improving the stability of the motor operation and reducing the cost of raw materials. The installation is more convenient and the production cost is reduced. The overall structure of the motor is relatively simple and the volume is small. It is suitable for some application scenarios with strict requirements on space dimensions. It has strong applicability, increases the efficiency of the motor operation, and reduces the difficulty and cost of maintenance.

[0019] Furthermore, the stator assembly 5 includes a stator insulation frame 51, a stator core 52 and a stator winding 53. The stator insulation frame 51 is directly cast on the surface of the stator insulation frame 51. The stator winding 53 is arranged on the stator insulation frame 51, and the stator winding 53 is arranged between the stator insulation frame 51 and the stator core 52. The stator insulation frame 51 is made of high heat-resistant and pressure-resistant materials such as nylon. When in use, the stator core 52 is an important part of the motor magnetic circuit and is usually made of 0.35-0.5mm The stator core is made of thick silicon steel sheets stacked together, and the surface of the silicon steel sheets has an insulating coating, which can reduce hysteresis and eddy current losses and improve the efficiency of the motor. The inner circle of the stator core is evenly distributed with slots for embedding the stator winding. Its shape and size have an important influence on the performance of the motor. The stacked core can allow the magnetic lines to pass smoothly with less loss, providing a good magnetic circuit for the normal operation of the motor. The stator winding 53 is wound by insulated wires. According to the different types and design requirements of the motor, the winding can adopt different winding methods and wiring methods, such as single-layer winding, double-layer winding, etc. These windings are embedded in the slots of the stator core according to a certain rule. Through reasonable arrangement and connection, when three-phase alternating current is passed, a rotating magnetic field can be generated to drive the rotor to rotate. The material of the winding is generally copper or aluminum, and its insulation performance is crucial to the reliability and safety of the motor.

[0020] Furthermore, the wire clamp 3 is arranged on one side of the rear end cover 2, and the wire clamp 3 and the rear end cover 2 are fixed by screws. When in use, the wire clamp 3 is arranged to facilitate fixing the wire.

[0021] Furthermore, the rotor assembly 6 is composed of a rotor core and a rotor winding. When in use, the rotor core is part of the motor magnetic circuit and is generally made of laminated silicon steel sheets. The silicon steel sheets have high magnetic permeability and low hysteresis loss, can effectively conduct magnetism, reduce energy loss caused by hysteresis and eddy current effects during motor operation, and improve the efficiency of the motor. There is usually insulation treatment between the rotor core laminations to further reduce eddy current losses. Slots for installing rotor windings or cast aluminum bars are evenly distributed on the outer circle. The rotor winding is wound with insulated wires and embedded in the rotor core slots according to a certain rule. It is connected to the external circuit through collector rings and brushes and can be used to adjust the motor's performance parameters such as speed and torque. In cage rotors, cast aluminum is usually used to cast aluminum liquid in the slots of the rotor core to form cage-like bars and end rings to form a closed loop. This structure is simple, strong, low cost and reliable in operation.

[0022] Furthermore, the housing 1 is injection molded with the rear end cover 2, the stator assembly 5 and the wire clamp 3 into one piece through BMC material. When in use, the sealing is better, and the plastic packaging material can effectively prevent dust, moisture and other external substances from entering the interior of the motor, protect the motor components from corrosion, and increase the service life of the motor in harsh environments, such as humid, dusty or corrosive gas environments.

[0023] Furthermore, a plurality of mounting holes are provided on one side of the outer wall of the rear end cover 2 for mounting and fixing the motor. When in use, the motor can be conveniently fixed by screws.

[0024] The working principle of the present invention is similar to that of the traditional motor. Based on the law of electromagnetic induction, the current flows through the stator winding 53 to generate a rotating magnetic field. This magnetic field interacts with the rotor assembly 6. The rotor assembly 6 is acted upon by the force in the magnetic field and begins to rotate, thereby converting electrical energy into mechanical energy. Compared with the traditional plastic-sealed motor, the motor adopts a single-bearing structure, and the bearing sleeve is arranged on the rotor assembly 6 and is located between the stator assembly 5 and the rotor assembly 6 to form a hollow structure without connecting the shaft, thereby improving the stability of the motor operation and reducing the cost of raw materials. The installation is more convenient and the production cost is reduced. The overall structure of the motor is relatively simple and the volume is small. It is suitable for some application scenarios with strict requirements on space dimensions. It has strong applicability, increases the efficiency of the motor operation, and reduces the difficulty and cost of maintenance.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes to a plastic-encapsulated single-bearing motor and its inventive concept according to the technology of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plastic-encapsulated single-bearing motor, comprising a housing (1), characterized in that: It also includes a rear end cover (2), a wire clamp (3), a front end cover (4), a stator assembly (5) and a rotor assembly (6), wherein a stator accommodating cavity is provided in the housing (1), and a rotor accommodating cavity is provided inside the stator accommodating cavity, wherein: The stator assembly (5) is arranged in the stator accommodating cavity, the rotor assembly (6) is arranged in the rotor accommodating cavity, and the rotor assembly (6) is rotatably connected to the interior of the casing (1); The front cover (4) is mounted on the front side of the housing (1), and the rear cover (2) is mounted on the rear side of the housing (1); A bearing (7) is sleeved on one end of the outer wall of the rotor assembly (6), and the bearing (7) is located between the stator assembly (5) and the rotor assembly (6).

2. The plastic-encapsulated single-bearing motor according to claim 1, characterized in that: The stator assembly (5) comprises a stator insulation frame (51), a stator iron core (52) and a stator winding (53); the stator insulation frame (51) is directly cast on the surface of the stator insulation frame (51); the stator winding (53) is provided on the stator insulation frame (51); and the stator winding (53) is arranged between the stator insulation frame (51) and the stator iron core (52).

3. The plastic-encapsulated single-bearing motor according to claim 1, characterized in that: The wire clamp (3) is arranged on one side of the rear end cover (2), and the wire clamp (3) and the rear end cover (2) are fixed by screws.

4. The plastic-encapsulated single-bearing motor according to claim 1, characterized in that: The rotor assembly (6) consists of a rotor core and a rotor winding.

5. The plastic-encapsulated single-bearing motor according to claim 1, characterized in that: The housing (1) is formed into one piece by injection molding the rear end cover (2), the stator assembly (5) and the wire clamp (3) using BMC material.

6. The plastic-encapsulated single-bearing motor according to claim 1, characterized in that: A plurality of mounting holes are provided on one side of the outer wall of the rear end cover (2) for mounting and fixing the motor.

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