Motor assembly and motor

Abstract

The application provides an electric machine assembly and an electric machine. The electric machine assembly comprises a stator assembly including a winding; the winding is provided with a first extension part and a second extension part connected at ends, the first extension part is arranged to extend along a radial direction of the stator assembly, and the second extension part is arranged to extend along an axial direction of the stator assembly; a rotor assembly including a squirrel cage rotor mechanism, the squirrel cage rotor mechanism includes a first bar and a second bar, the first bar is arranged to extend along a radial direction of the rotor assembly and is connected with a rotating shaft of the rotor assembly; the second bar is arranged to extend along an axial direction of the rotating shaft; the first bar and the first extension part are oppositely arranged, and the second bar and the second extension part are oppositely arranged. The application is arranged to be acted on by a magnetic field in the radial direction and the axial direction, so that the electric machine simultaneously has axial magnetic flux and radial magnetic flux, and thus the action force of the radial magnetic flux and the axial magnetic flux on the rotor can be simultaneously regulated.

Description

Technical Field

[0001] This application belongs to the field of motor technology, specifically relating to a motor assembly and a motor. Background Technology

[0002] In recent years, with the continuous expansion of the home appliance market, motors, as a crucial core component of these appliances, have seen increasingly wider applications and uses. Existing motor structures can be divided into two categories: radial flux motors and axial flux motors. The difference lies in the direction of the magnetic flux: axial flux is axial, parallel to the mechanical axis of rotation; radial flux is radial, perpendicular to the mechanical axis of rotation. When alternating current flows through the stator windings, a rotating magnetic field is formed. The stator windings can only exert force on the rotor in a single direction—either axial or radial flux—resulting in relatively low motor output torque. Summary of the Invention

[0003] Therefore, this application provides a motor assembly and a motor that can solve the problem in the prior art where the stator winding can only exert force on the rotor in a single direction, either axial or radial magnetic flux, resulting in a small motor output torque.

[0004] To address the aforementioned problems, this application provides a motor assembly, comprising:

[0005] A stator assembly includes a winding; the winding has a first extension and a second extension connected at its ends, the first extension extending in the radial direction of the stator assembly and the second extension extending in the axial direction of the stator assembly.

[0006] The rotor assembly includes a squirrel cage rotor mechanism, the squirrel cage rotor mechanism including a first guide bar and a second guide bar connected at both ends, the first guide bar extending radially along the rotation axis of the rotor assembly; the second guide bar extending axially along the rotation axis.

[0007] The first guide bar and the first extension portion are arranged opposite to each other, and the second guide bar and the second extension portion are arranged opposite to each other.

[0008] Optionally, the winding further includes a third extension portion, one end of which is connected to the other end of the second extension portion. The first extension portion extends toward the shaft, and the third extension portion extends away from the shaft. The squirrel cage rotor mechanism further includes a third guide bar, one end of which is connected to the other end of the second guide bar. The third guide bar is disposed opposite to the third extension portion. The first guide bar extends toward the shaft, and the third guide bar extends in a radial direction away from the shaft.

[0009] Optionally, a first gap is provided between the first guide strip and the first extension portion, a second gap is provided between the second guide strip and the second extension portion, and a third gap is provided between the third guide strip and the third extension portion, wherein the size of the first gap, the size of the second gap, and the size of the third gap are the same.

[0010] Optionally, an outer end ring is connected to the end of the third guide bar away from the rotating shaft, and the outer end ring covers the outer periphery of the third extension.

[0011] Optionally, the number of the first guide strip, the second guide strip, and the third guide strip is at least 2.

[0012] Optionally, the winding is configured as a fan shape formed by enameled wire, and the fan shape is bent into an L-shaped structure formed by the first extension and the second extension, or bent into a Z-shaped structure formed by the first extension, the second extension and the third extension.

[0013] According to another aspect of this application, an electric motor is provided, including the motor assembly described above.

[0014] Optionally, the number of windings is set to n, satisfying n = 2mp, where m is the number of phases of the motor; p is the number of pole pairs of the motor; each phase of the motor includes multiple coils connected in series, and the winding coils of different phases are evenly arranged with cross intervals.

[0015] Optionally, the stator assembly further includes a housing, the housing being configured as a circular groove, the windings being attached to the inner wall of the circular groove, and the rotor assembly being disposed in the circular groove.

[0016] Optionally, a bearing chamber is provided at the bottom center of the circular groove, and the rotating shaft passes through the bearing in the bearing chamber; limiting members are provided on both axial sides of the bearing and are locked on the rotating shaft, the limiting members including open retaining rings.

[0017] This application provides a motor assembly, comprising: a stator assembly including a winding; the winding having a first extension and a second extension connected at its ends, the first extension extending radially along the stator assembly and the second extension extending axially along the stator assembly; and a rotor assembly including a squirrel-cage rotor mechanism, the squirrel-cage rotor mechanism including a first guide bar and a second guide bar, the first guide bar extending radially along the rotor assembly and connected to the rotor shaft of the rotor assembly; the second guide bar extending axially along the shaft; the first guide bar and the first extension are arranged opposite to each other, and the second guide bar and the second extension are arranged opposite to each other.

[0018] This application sets up magnetic fields in both the radial and axial directions, so that the motor has both axial and radial magnetic flux. Therefore, it is possible to simultaneously control the force exerted on the rotor by the radial and axial magnetic flux, thereby improving the output torque of the motor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the motor assembly according to an embodiment of this application;

[0020] Figure 2 This is an exploded view of the motor assembly according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the stator assembly according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the winding structure according to an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the winding lay-up state according to an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the rotor assembly according to an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of the magnetic circuit of the motor assembly according to an embodiment of this application;

[0026] Figure 8 This is a cross-sectional view of the motor assembly according to an embodiment of this application.

[0027] The reference numerals in the attached figures are as follows:

[0028] 1. Rotor assembly; 11. First guide bar; 12. Second guide bar; 13. Third guide bar; 14. Outer end ring; 2. Stator assembly; 21. First extension; 22. Second extension; 23. Third extension; 24. Bearing housing; 25. Housing; 3. Shaft; 4. Bearing; 5. Open retaining ring. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] See also Figures 1 to 8 As shown, according to an embodiment of this application, a motor assembly includes:

[0032] Stator assembly 2 includes a winding; the winding is provided with a first extension 21 and a second extension 22 connected at its ends, the first extension 21 extending along the radial direction of the stator assembly 2, and the second extension 22 extending along the axial direction of the stator assembly 2.

[0033] The rotor assembly 1 includes a squirrel cage rotor mechanism, which includes a first guide bar 11 and a second guide bar 12 connected at their ends. The first guide bar 11 extends radially along the rotation axis 3 of the rotor assembly 1, and the second guide bar 12 extends axially along the rotation axis 3.

[0034] The first guide bar 11 and the first extension 21 are arranged opposite to each other, and the second guide bar 12 and the second extension 22 are arranged opposite to each other.

[0035] This application sets up magnetic fields in both the radial and axial directions, so that the motor has both axial and radial magnetic flux. Therefore, it is possible to simultaneously control the force exerted on the rotor by the radial and axial magnetic flux, thereby improving the output torque of the motor.

[0036] This application employs a composite magnetic field combination technology with different directions to ensure that the rotor generates torque in the same direction, and the output torques on the shaft 3 are superimposed, thereby significantly improving the magnetic performance of the stator winding. It fully utilizes the spatial structure of the stator winding magnetic circuit, solves the bottleneck technical problem in the industry where the magnetic field cannot be fully utilized due to motor structure limitations, and greatly improves motor efficiency, improves the motor heat dissipation system, and reduces motor cost.

[0037] like Figure 7As shown, the motor assembly of this application can ensure that the winding generates a rotating magnetic field when an alternating current is applied. The first guide bar 11 and the second guide bar 12 can effectively cut the axial magnetic flux and radial magnetic flux generated by the winding, so that the direction of the torque generated by the rotor is consistent. The output torque on the rotating shaft 3 is superimposed on each other, making full use of the spatial structure of the stator winding magnetic circuit to drive the rotor assembly 1 to rotate.

[0038] In existing motor structures, some windings are located outside the stator core end and do not participate in the conversion of electromagnetic energy. They are only used to form a circuit and have no substantial function. The higher the stator end winding protrudes, the greater the loss and the lower the motor efficiency.

[0039] This application can use the portion of the conventional stator winding located outside the stator core end as a radially extending first extension 21, so that the entire winding forms an L-shaped structure. In this way, the non-functional portion of the conventional structure can participate in the conversion of electromagnetic energy, reducing losses and increasing motor efficiency.

[0040] This application uses a squirrel-cage rotor assembly 1 with an overall "hollowed-out" design. The motor has a good heat dissipation system in both the axial and radial directions during rotation, so that the heat generated can be quickly and effectively dissipated, thus improving the quality of the motor.

[0041] In some embodiments, the winding is further provided with a third extension portion 23, one end of which is connected to the other end of the second extension portion 22. The first extension portion 21 extends toward the rotating shaft 3, and the third extension portion 23 extends away from the rotating shaft 3. The squirrel cage rotor mechanism further includes a third guide bar 13, one end of which is connected to the other end of the second guide bar 12. The third guide bar 13 is disposed opposite to the third extension portion 23. The first guide bar 11 extends toward the rotating shaft 3, and the third guide bar 13 extends in a radial direction away from the rotating shaft 3.

[0042] The protruding windings at both ends of the stator core are respectively designated as the first extension 21 and the third extension 23. At the same time, the rotor assembly 1 is adapted to further improve the efficiency of the entire motor assembly.

[0043] In traditional motor structures, the exposed windings at both ends of the stator core consume a large amount of enameled wire, resulting in relatively high costs. This application makes full use of this portion of enameled wire, thereby reducing costs while improving motor efficiency.

[0044] For the stator assembly 2 and rotor assembly 1, the extension section and guide bar can be arranged in other similar structures and methods, that is, to satisfy the situation where axial and radial magnetic flux exist at the same time, and the quantity can be set as needed.

[0045] In some embodiments, a first gap is provided between the first guide bar 11 and the first extension portion 21, a second gap is provided between the second guide bar 12 and the second extension portion 22, and a third gap is provided between the third guide bar 13 and the third extension portion 23, wherein the size of the first gap, the size of the second gap, and the size of the third gap are the same.

[0046] The arrangement of opposing magnetic field elements ensures better cooperation between rotor assembly 1 and stator assembly 2, including axis alignment, resulting in structural stability and high efficiency.

[0047] In some embodiments, an outer end ring 14 is connected to one end of the third guide bar 13 away from the rotating shaft 3, and the outer end ring 14 covers the outer periphery of the third extension portion 23.

[0048] Setting the outer end ring 14 to be larger than the third extension 23 reduces magnetic leakage and also protects the winding.

[0049] In some embodiments, the number of the first guide bar 11, the second guide bar 12, and the third guide bar 13 is at least 2.

[0050] Setting multiple conductor bars can improve the efficiency of effectively cutting the axial and radial magnetic flux generated by the windings, and thus improve motor efficiency.

[0051] In some embodiments, the winding is configured as a fan shape formed by enameled wire, and the fan shape is bent into an L-shaped structure formed by the first extension portion 21 and the second extension portion 22, or bent into a Z-shaped structure formed by the first extension portion 21, the second extension portion 22 and the third extension portion 23.

[0052] Because the extensions of the windings extend in different directions, the windings are designed as a fan shape formed by the surrounding enameled wire, such as... Figure 5 The planar structure shown is then bent to form an L-shaped structure consisting of the first extension 21 and the second extension 22, or a Z-shaped structure consisting of the first extension 21, the second extension 22 and the third extension 23. The manufacturing process and structure are both simple.

[0053] According to another aspect of this application, an electric motor is provided, including the motor assembly described above.

[0054] In some embodiments, the number of windings is set to n, satisfying n = 2mp, where m is the number of phases of the motor; p is the number of pole pairs of the motor; the winding of each phase of the motor includes multiple coils connected in series, and the winding coils of different phases are evenly arranged with cross intervals.

[0055] The number of windings in this application satisfies n = 2mp, where m is the number of phases of the motor, generally defined as m ≥ 2; p is the number of pole pairs of the motor, defined as a positive integer. Each phase of the motor winding includes multiple coils connected in series. The coils of different phases are evenly arranged with alternating intervals, meaning that for multiple coils connected in series in a certain phase winding, adjacent coils have opposite winding directions, forming N\S magnetic pole pairs with adjacent windings. For example... Figure 5 As shown, the main phase has four winding coils. Two windings arranged opposite each other are connected, and both contain the same total number of turns, but with opposite winding directions: 1 clockwise, 2 counterclockwise, 3 clockwise, and 4 counterclockwise. This pattern can be used to extrapolate different winding configurations for motors with varying numbers of phases and poles.

[0056] In some embodiments, the stator assembly 2 further includes a housing 25, which is configured as a circular groove, the winding is attached to the inner wall of the circular groove, and the rotor assembly 1 is disposed in the circular groove.

[0057] The housing 25 with a circular slot is used. The L-shaped winding is attached to the inner wall of the circular slot, or the Z-shaped winding is partially attached to the end face of the slot opening. It is cured and glued with glue to form a solid whole. It is then formed into a stator assembly 2 by injection molding. The rotor assembly 1 is arranged in the circular slot at intervals.

[0058] In some embodiments, a bearing chamber 24 is provided at the bottom center of the circular groove, and the rotating shaft 3 passes through the bearing 4 and is installed in the bearing chamber 24; the bearing 4 is provided with limiting members on both axial sides that are locked onto the rotating shaft 3, and the limiting members include open retaining rings 5.

[0059] The rotor shaft 3 restricts the bearing 4 in the bearing chamber 24 on the stator assembly 2 through the open retaining ring 5. The shaft 3 is always fitted with an interference fit, and the interference is generally set to 5 to 20 μm, thus forming a composite flux motor.

[0060] The manufacturing process of the motor assembly in this application generally includes:

[0061] Step 1: Using specific special tooling and a high-precision winding machine, multiple "fan-shaped" coils are wound according to the predetermined winding electromagnetic scheme. The winding machine should have excellent winding coil arrangement capabilities. Then, using specific tooling, the windings are shaped and pressed into a "stepped" shape, and then cured and bonded with glue to ensure that chemical cross-linking occurs after adjacent coils are bonded, i.e., an infusible adhesive film, forming a solid whole, thus completing the stator winding production. The preferred material for the winding coils is self-adhesive enameled copper wire or self-adhesive enameled aluminum wire.

[0062] Step 2: Connect the cured winding wire ends and wire tails to the inner terminals of the power supply terminals respectively. Use the injection mold to limit and fix the "step-shaped" winding and terminals. Then, injection mold the whole piece. The injection molded blank forms the bearing 4 chamber 24 and mounting holes and other shapes and structures to complete the stator assembly 2. The injection molding material is preferably nylon or PBT plastic.

[0063] Step 3: Using a die-casting mold, the mechanical rotating shaft 3, the first guide bar 11, the second guide bar 12, the third guide bar 13 and the outer end ring 14 are die-cast into a single unit according to the predetermined electromagnetic scheme, thus completing the manufacturing of rotor assembly 1. The die-casting material is preferably aluminum or copper.

[0064] Step 4: Install the mechanical rotating shaft 3 end of rotor assembly 1 with bearing 4, and use open retaining ring 5 to limit the bearing 4 to prevent axial movement. Place bearing 4 inside bearing 4 chamber 24 of stator assembly 2, and ensure that the central axis of stator assembly 2 coincides with the central axis of rotor assembly 1 to complete the assembly and manufacturing of composite flux motor.

[0065] It will be readily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above description is merely a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A motor assembly, characterized in that, include: The stator assembly (2) includes a winding; the winding is provided with a first extension (21) and a second extension (22) connected at the ends, the first extension (21) is provided to extend in the radial direction of the stator assembly (2), and the second extension (22) is provided to extend in the axial direction of the stator assembly (2); The rotor assembly (1) includes a squirrel cage rotor mechanism, which includes a first guide bar (11) and a second guide bar (12) connected at both ends. The first guide bar (11) extends radially along the shaft (3) of the rotor assembly (1), and the second guide bar (12) extends axially along the shaft (3). The first guide bar (11) and the first extension (21) are arranged opposite to each other, and the second guide bar (12) and the second extension (22) are arranged opposite to each other; the winding is also provided with a third extension (23), one end of the third extension (23) is connected to the other end of the second extension (22), the first extension (21) extends toward the shaft (3), and the third extension (23) extends away from the shaft (3); the squirrel cage rotor mechanism also includes a third guide bar (13), one end of the third guide bar (13) is connected to the other end of the second guide bar (12), and the third guide bar (13) is arranged opposite to the third extension (23); the first guide bar (11) extends toward the shaft (3), and the third guide bar (13) extends in a radial direction away from the shaft (3).

2. The motor assembly according to claim 1, characterized in that, A first gap is provided between the first guide bar (11) and the first extension part (21), a second gap is provided between the second guide bar (12) and the second extension part (22), and a third gap is provided between the third guide bar (13) and the third extension part (23). The size of the first gap, the size of the second gap, and the size of the third gap are the same.

3. The motor assembly according to claim 1, characterized in that, The third guide bar (13) has an outer end ring (14) connected to one end away from the rotating shaft (3), and the outer end ring (14) covers the outer periphery of the third extension (23).

4. The motor assembly according to claim 1, characterized in that, The number of the first guide bar (11), the second guide bar (12) and the third guide bar (13) is at least 2.

5. The motor assembly according to any one of claims 1-4, characterized in that, The winding is configured as a fan shape formed by enameled wire, and the fan shape is bent into a Z-shaped structure formed by the first extension (21), the second extension (22) and the third extension (23).

6. An electric motor, characterized in that, Includes the motor assembly as described in any one of claims 1-5.

7. The motor according to claim 6, characterized in that, The number of windings is set to n, satisfying n=2mp, where m is the number of phases of the motor; p is the number of pole pairs of the motor; each phase of the motor winding includes multiple coils connected in series, and the winding coils of different phases are evenly arranged with cross intervals.

8. The motor according to claim 7, characterized in that, The stator assembly (2) further includes a housing (25), which is configured as a circular groove, the winding is attached to the inner wall of the circular groove, and the rotor assembly (1) is disposed in the circular groove.

9. The motor according to claim 8, characterized in that, The bottom center of the circular groove is provided with a bearing (4) chamber (24), and the rotating shaft (3) passes through the bearing (4) in the bearing (4) chamber (24); the bearing (4) is provided with limiting members on both sides of the axial direction, which are locked on the rotating shaft (3), and the limiting members include open retaining rings (5).

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