A spoke salient pole DD motor for a drum washing machine

Abstract

The application relates to the field of motor technology, in particular to a SPOKE salient pole DD motor for a drum washing machine, which comprises a shell connected with an inner drum of the washing machine, a stator assembly connected with an outer drum of the washing machine and a rotor assembly installed on the shell, the rotor assembly comprises a rotor core and first permanent magnets and second permanent magnets arranged on the rotor core, the rotor core is arranged in a circular ring, a plurality of first permanent magnets and second permanent magnets are alternately arranged in sequence along the circumference of the rotor core, the first permanent magnets are arranged along the radial direction of the rotor core, and the second permanent magnets are arranged along the tangential direction of the rotor core. The application has the effects of improving the magnetic leakage problem of a conventional SPOKE salient pole DD motor, improving the motor performance and efficiency, and the motor in the scheme has low production cost and the structure is easy to mass-produce.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a SPOKE salient pole DD motor for a drum washing machine. Background Technology

[0002] With the continuous advancement of technology, drum washing machines are increasingly favored by consumers due to their advantages such as high efficiency, energy saving, and superior cleaning power. Among the core components of drum washing machines, the performance of the motor directly affects the overall operating effect. Currently, direct drive (DD) motors are widely used in drum washing machines due to their compact structure, high transmission efficiency, and low noise.

[0003] Among DD motors, the SPOKE salient pole DD motor has the best performance. However, its magnetic leakage problem is quite prominent. Magnetic leakage not only reduces the motor's performance and efficiency, but may also interfere with surrounding electronic components, affecting the overall performance of the washing machine. To avoid magnetic leakage, the rotor core is designed with multiple independent core blocks, which not only makes the manufacturing process complex, but also consumes a lot of materials and makes it difficult to control costs, making it difficult for the SPOKE salient pole DD motor to achieve mass production. Utility Model Content

[0004] In order to improve the leakage magnetic field problem of traditional SPOKE salient pole DD motors, increase motor efficiency, and optimize motor structure, this application provides a SPOKE salient pole DD motor for drum washing machines.

[0005] This application provides a SPOKE salient-pole DD motor for a drum washing machine, which adopts the following technical solution: A SPOKE salient pole DD motor for a drum washing machine includes a housing connected to the inner drum of the washing machine, a stator assembly connected to the outer drum of the washing machine, and a rotor assembly mounted on the housing. The rotor assembly includes a rotor core and a first permanent magnet and a second permanent magnet disposed on the rotor core. The rotor core is wound into a ring. A plurality of first permanent magnets and second permanent magnets are alternately arranged along the circumference of the rotor core. The first permanent magnets are arranged radially along the rotor core, and the second permanent magnets are arranged tangentially along the rotor core.

[0006] Preferably, the rotor core is provided with a first slot and a second slot for mounting a first permanent magnet and a second permanent magnet, respectively, and the first permanent magnet and the second permanent magnet are fixed in the first slot and the second slot respectively by adhesive.

[0007] Preferably, the outer casing is made of galvanized sheet material, and the rotor core is embedded in the inner ring of the outer casing.

[0008] Preferably, the outer casing has a central spline at its center, and the outer casing and the central spline are fixedly connected.

[0009] Preferably, the stator assembly includes a stator core, an injection-molded housing, and windings. The injection-molded housing is injection-molded and covers the outside of the stator core. The injection-molded housing extends toward the center of the stator core and is provided with an injection-molded flange for connecting to the outer drum of the washing machine. The windings are disposed outside the stator teeth of the stator core covered by the injection-molded housing.

[0010] Preferably, the stator core is made of stacked silicon steel sheets.

[0011] Preferably, the winding is made of enameled wire.

[0012] In summary, this application includes the following beneficial technical effects: This utility model provides a SPOKE salient pole DD motor for a drum washing machine. By employing a first permanent magnet and a second permanent magnet arranged radially and tangentially, the difference in inductance between the quadrature and direct axes is increased, and the reluctance torque is utilized more fully. This effectively optimizes the magnetic field distribution, reduces magnetic leakage, and simultaneously reduces the d-axis magnetic permeability, thereby improving torque output capability, increasing motor efficiency and performance, reducing interference to surrounding electronic components, and using a continuously wound rotor core to reduce material consumption. Thus, it achieves the effects of improving the magnetic leakage problem of traditional SPOKE salient pole DD motors, increasing motor efficiency, and optimizing motor structure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the SPOKE salient pole DD motor used in a drum washing machine according to an embodiment of this application; Figure 2 This is a schematic diagram illustrating the rotor assembly in an embodiment of this application; Figure 3 This is a schematic diagram illustrating the rotor core in the embodiments of this application; Figure 4 This is a schematic diagram illustrating the stator assembly in an embodiment of this application; Figure 5 This is a schematic diagram illustrating the winding of the rotor core in an embodiment of this application; Figure 6 This is a schematic diagram illustrating the first connection method between the outer shell and the central spline in the embodiments of this application; Figure 7 This is a schematic diagram illustrating the second connection method between the outer shell and the central spline in an embodiment of this application; Figure 8 This is a schematic diagram illustrating a third connection method between the outer shell and the central spline in an embodiment of this application.

[0014] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Center spline; 2. Stator assembly; 21. Stator core; 22. Injection molded shell; 23. Winding; 3. Rotor assembly; 31. Rotor core; 311. First slot; 312. Second slot; 313. Metal magnetic ring; 32. First permanent magnet; 33. Second permanent magnet. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0016] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or specific orientation structure and operation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0017] Embodiment 1 of this application discloses a SPOKE salient-pole DD motor for a drum washing machine. (See also...) Figures 1-6 The SPOKE salient pole DD motor for drum washing machines includes a housing 1 connected to the inner drum of the washing machine, a stator assembly 2 connected to the outer drum of the washing machine, and a rotor assembly 3 mounted on the housing 1. The rotor assembly 3 includes a rotor core 31 and a first permanent magnet 32 ​​and a second permanent magnet 33 disposed on the rotor core 31. The rotor core 31 is continuously wound and formed, and fixedly connected by means of cap buckles, pins, welding, etc. Compared with the traditional method of arranging several individual core blocks in a circular and equidistant manner, the manufacturing process reduces material consumption and lowers costs.

[0018] The rotor core 31 is provided with a first slot 311 and a second slot 312. Several first slots 311 and second slots 312 are arranged at equal intervals along the circumference of the rotor core 31. The first permanent magnet 32 ​​and the second permanent magnet are installed in the first slots 311 and the second slots 312 by adhesive. The first permanent magnet 32 ​​is arranged radially along the rotor core 31, and the second permanent magnet 33 is arranged tangentially along the rotor core 31. The first permanent magnet 32 ​​and the second permanent magnet are arranged alternately in sequence.

[0019] The outer casing 1 is made of galvanized sheet material, and the rotor core 31 is embedded in the inner ring of the outer casing 1.

[0020] The outer shell 1 has a central spline 11 at its center. The central spline 11 is manufactured by machining and is fixed to the outer shell 1 by welding.

[0021] The stator assembly 2 includes a stator core 21, an injection-molded housing 22, and a winding 23. The stator core 21 is made of laminated silicon steel sheets. During the lamination process, the lamination dimensions and perpendicularity of the silicon steel sheets are strictly controlled to ensure the quality of the stator core 21. The injection-molded housing 22 is injection-molded and covers the outside of the stator core. An injection-molded flange for connecting the outer drum of the washing machine is provided on the injection-molded housing 22 extending towards the center of the stator core 21. The winding 23 is made of enameled wire and is located outside the stator teeth of the stator core 21 covered by the injection-molded housing 22.

[0022] The implementation principle of a SPOKE salient pole DD motor for a drum washing machine according to an embodiment of this application is as follows: When the motor is powered on, the winding 23 on the stator generates a rotating magnetic field. The first permanent magnet 32 ​​and the second permanent magnet 33 on the rotor are subjected to electromagnetic force under the action of the rotating magnetic field, thereby driving the rotor to rotate. Due to the use of radially and tangentially arranged first permanent magnets 32 and second permanent magnets 33, the difference between the quadrature and direct axes inductance is greater, the reluctance torque is utilized more fully, the magnetic field distribution can be effectively optimized, and the occurrence of magnetic leakage phenomenon can be reduced. The first permanent magnets 32 and the second permanent magnets 33 cooperate with each other, making the rotor magnetic field more uniform and improving the efficiency and performance of the motor.

[0023] Meanwhile, by rationally designing the rotor core 31 and selecting appropriate materials and processes, the feasibility of production was ensured.

[0024] The specific difference between Embodiment 2 and Embodiment 1 lies in the connection method between the outer shell 1 and the central spline 11, such as... Figure 7 As shown, the details are as follows: The central spline 11 is made of powder metallurgy and is manufactured using a mold. Its sidewalls are provided with annular bosses. The central spline 11 and the outer shell 1 are fixed to each other by an injection molding structure.

[0025] In the above embodiments one and two, the galvanized steel shell 1, in addition to serving as a connection for the parts in the rotor assembly 3, can also serve as a magnetic yoke, providing the magnetic flux path required for the magnetic field of the first permanent magnet 32 ​​and the second permanent magnet 33.

[0026] The specific difference between Embodiment 3 and Embodiment 1 also lies in the connection method between the outer shell 1 and the central spline 11, such as... Figure 8 As shown, the details are as follows: To reduce production costs, the outer shell 1 can be replaced with plastic material, i.e., injection molded parts. In this case, the magnetic circuit problem of the first permanent magnet 32 ​​and the second permanent magnet 33 needs to be considered. A metal magnetic ring 313 is installed outside the rotor core 31, and finally fixed to the powder metallurgy center spline 11 through the injection molding structure.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of this utility model, and the protection scope of this utility model is not limited to the above embodiments. All technical solutions within the scope of this utility model's concept are within the protection scope of this utility model. It should be pointed out that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A SPOKE salient pole DD motor for a drum washing machine, characterized by: The washing machine includes a housing (1) connected to the inner drum, a stator assembly (2) connected to the outer drum, and a rotor assembly (3) mounted on the housing (1). The rotor assembly (3) includes a rotor core (31) and a first permanent magnet (32) and a second permanent magnet (33) disposed on the rotor core (31). The rotor core (31) is wound into a ring. Several first permanent magnets (32) and second permanent magnets are alternately arranged along its circumference on the rotor core (31). The first permanent magnets (32) are arranged radially along the rotor core (31), and the second permanent magnets (33) are arranged tangentially along the rotor core (31).

2. A SPOKE salient-pole DD motor for a drum washing machine according to claim 1, characterized in that: The rotor core (31) is provided with a first slot (311) and a second slot (312) for installing a first permanent magnet (32) and a second permanent magnet (33). The first permanent magnet (32) and the second permanent magnet (33) are fixed in the first slot (311) and the second slot (312) respectively by adhesive.

3. A SPOKE salient pole DD motor for a drum washing machine according to claim 1, characterized in that: The outer shell (1) is made of galvanized sheet material, and the rotor core (31) is embedded in the inner ring of the outer shell (1).

4. A SPOKE salient-pole DD motor for a drum washing machine according to claim 3, characterized in that: The outer shell (1) has a central spline (11) at its center, and the outer shell (1) and the central spline (11) are fixedly connected.

5. A SPOKE salient pole DD motor for a drum washing machine according to claim 1, characterized in that: The stator assembly (2) includes a stator core (21), an injection-molded housing (22), and a winding (23). The injection-molded housing (22) is injection-molded and covers the outside of the stator core. The injection-molded housing (22) extends toward the center of the stator core (21) and is provided with an injection-molded flange for connecting the outer tub of the washing machine. The winding (23) is located outside the stator teeth of the stator core (21) covered by the injection-molded housing (22).

6. A SPOKE salient pole DD motor for a drum washing machine according to claim 5, characterized in that: The stator core (21) is made of stacked silicon steel sheets.

7. A SPOKE salient-pole DD motor for a drum washing machine according to claim 5, characterized in that: The winding (23) is made of enameled wire.

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