Motor

Abstract

The utility model provides a motor. The motor comprises a stator assembly and a motor shell. The stator assembly has a stator core and an enameled wire wound around the stator assembly. The motor shell is of an integrated injection molding structure and comprises a shell wall, a first enameled wire fixing part and a second enameled wire fixing part. The shell wall wraps the annular outer surface of the stator core, the first enameled wire fixing portion and the second enameled wire fixing portion are connected with the shell wall and wrap enameled wires on the two sides of the stator assembly in the axial direction respectively, and the stator assembly is fixed between the first enameled wire fixing portion and the second enameled wire fixing portion through the first enameled wire fixing portion and the second enameled wire fixing portion.

Description

Technical Field

[0001] The present disclosure relates to the field of electric machines. Background Art

[0002] Currently, motor casings are generally divided into aluminum casings and cast iron casings.

[0003] Aluminum shell motor: The manufacturing material is aluminum. Its advantages are that it is not easy to rust, light weight, good heat dissipation, good thermal conductivity, can be die-cast, good plasticity, higher elongation than cast iron, low noise, and good movement stability. The disadvantages of aluminum shell motors are high price and low hardness, and they are suitable for installing small power motors.

[0004] Cast iron motor: Nowadays, most motor housings are made of cast iron. The advantages of cast iron motors are high hardness, good resistance to external pressure, not easy to deform, and low price. The disadvantages of cast iron motors are easy to rust, heavy weight, poorer thermal conductivity than aluminum shell motors, cannot be die-casted, poorer plasticity than aluminum shell motors, and lower elongation than aluminum shell motors. They are noisy and not as stable as aluminum shell motors.

[0005] Regardless of whether it is an aluminum shell motor or a cast iron motor, the motor assembly must involve the process of pressing the motor stator into the shell. The motor stator assembly process is to first heat the motor shell, hoist the motor stator above the vertical motor shell, align the stator and the shell, match the positioning key in the shell with the keyway on the stator, and slowly hoist the stator vertically into the shell; due to the error of the positioning key on the shell and the error of the stator keyway, the hoisting process will be stuck, making it impossible to install the stator in place at one time. It is necessary to apply a certain pressure to the stator during the assembly process to install it in place. Since the end of the stator winding cannot be pressed, it is easy to cause assembly failure and waste. Especially for high-power motors, due to their large size and weight, large heating equipment is required when heating the motor shell, which is not conducive to mass production and small factories, and it is also easy to be dangerous when hoisting and moving the motor shell and stator. The above reasons make the motor stator assembly process complicated.

[0006] In addition, the stator is installed into the motor casing, and the stator and the casing are not an integrated structure, so the shock absorption and noise reduction effect is not good; the enameled wire of the stator is exposed to the air and is very easy to vibrate with the vibration of the motor during operation, especially when the motor starts and stops, thus generating high-frequency harmonics, increasing losses and reducing efficiency.

[0007] Therefore, a motor with excellent performance is needed to reduce problems such as noise and assembly difficulty. Utility Model Content

[0008] The purpose of the present disclosure is to at least solve the shortcomings existing in the prior art. The present disclosure proposes a motor, characterized in that it includes a stator assembly, a stator core with a circular ring structure and an enameled wire wound around the stator assembly, the enameled wire protruding from the stator core on both sides of the axial direction of the stator core; a motor housing, which is an integrated structure and is open at both ends in the axial direction, the motor housing includes a housing wall, a first enameled wire fixing portion and a second enameled wire fixing portion, the housing wall covers the annular outer surface of the stator core, the first enameled wire fixing portion and the second enameled wire fixing portion are connected to the housing wall The enameled wire is connected and respectively coated on both sides of the stator assembly in the axial direction, and the first enameled wire fixing part and the second enameled wire fixing part fix the stator assembly therebetween; a rotor assembly is magnetically matched with the stator assembly and can be pivotally mounted on the motor housing relative to the stator assembly; a rotating shaft is matched with the rotor assembly to pivot together; a first cover is used to cover the motor housing at the first end of the motor housing; a second cover is used to cover the motor housing at the second end of the motor housing, wherein the distance between the first cover and the stator assembly is less than the distance between the second cover and the stator assembly. At least one of the first cover and the second cover is provided with a through hole allowing the rotating shaft to extend.

[0009] For example, according to some embodiments of the present disclosure, the motor housing further includes a partition wall, which is perpendicular to the axial direction and divides the motor housing into a first chamber and a second chamber, and the first chamber accommodates the rotor assembly.

[0010] For example, according to some embodiments of the present disclosure, the motor further includes a control circuit board for controlling the operation of the motor, and the control circuit board is accommodated in the second chamber.

[0011] For example, according to some embodiments of the present disclosure, the control circuit board is mounted on the second cover.

[0012] For example, according to some embodiments of the present disclosure, a first groove is provided on a side of the first cover facing the first chamber, and the first groove is used to accommodate a first bearing.

[0013] For example, according to some embodiments of the present disclosure, a second groove is provided on a side of the partition wall facing the first chamber, the second groove is used to accommodate a second bearing, and the rotating shaft is pivotally engaged with the first bearing and the second bearing.

[0014] For example, according to some embodiments of the present disclosure, the rotor assembly includes a plastic magnetic rotor frame and permanent magnets, the rotor frame is an annular structure made of plastic magnetic material and symmetrical about the central axis, and the permanent magnets are arranged in the rotor frame and symmetrical about the central axis.

[0015] For example, according to some embodiments of the present disclosure, the outer periphery of the plastic magnetic rotor skeleton is covered with a magnetic ring made of permanent magnetic material.

[0016] For example, according to some embodiments of the present disclosure, the partition wall is connected to the housing wall through one of a first enameled wire fixing portion and a second enameled wire fixing portion.

[0017] For example, according to some embodiments of the present disclosure, the motor housing also includes an electrical display mounting portion, which is connected to the periphery of the housing wall and is used to install a display component and / or a control component, the display component is used to display the operating parameters and operating status of the motor, and the control component is used to apply instructions to the motor.

[0018] For example, according to some embodiments of the present disclosure, the motor further includes a cooling fan, and the cooling fan is connected to the rotating shaft through a speed changing device and is driven by the rotating shaft.

[0019] For example, according to some embodiments of the present disclosure, the motor housing, the first cover, and the second cover are all structures integrally injection-molded by BMC material. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic cross-sectional view of a motor according to an embodiment of the present disclosure is shown;

[0021] Figure 2 Show the root cause Figure 1 A partial cross-sectional perspective schematic diagram of a motor housing and a stator assembly of a motor;

[0022] Figure 3 A schematic diagram showing the assembly steps of a stator assembly according to one embodiment of the present disclosure;

[0023] Figure 4 A schematic diagram showing a portion of a rotor assembly according to one embodiment of the present disclosure;

[0024] Figure 5 A schematic diagram showing a portion of a rotor assembly according to another embodiment of the present disclosure;

[0025] Figure 6 A three-dimensional schematic diagram of a motor according to another embodiment of the present disclosure is shown;

[0026] Figure 7 Shown including according to Figure 1 3D schematic diagram of the motor.

[0027] Reference numerals

[0028] 1st stator assembly, 11st stator core, 12th enameled wire,

[0029] 2 motor housing, 21 first enameled wire fixing portion, 22 second enameled wire fixing portion, 23 housing wall, 24 partition wall, 241 second groove, 25 first chamber, 26 second chamber, 27 electrical display mounting portion, 3 rotor assembly, 31 rotating shaft, 32 plastic magnetic rotor frame, 33 permanent magnet, 34 magnetic ring, 41 first cover, 411 first groove, 42 second cover,

[0030] 51 first bearing, 52 second bearing,

[0031] 61 display component, 62 control component, 63 junction box, 64 control circuit board

[0032] 71 cooling fan, 72 fan cover, 73 speed change device

[0033] s1 first step, s2 second step, s3 third step, s4 fourth step, s5 fifth step DETAILED DESCRIPTION

[0034] In order to make the purpose, scheme and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0035] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0036] In the present disclosure, for the convenience of description, the direction in which the rotating shaft extends is designated as the axial direction of the motor.

[0037] Figure 1 The cross-sectional schematic diagram of a motor according to an embodiment of the present disclosure is shown. The motor according to the present disclosure includes a stator assembly 1, a rotor assembly 3, a motor housing 2, a first cover 41 and a second cover 42. The motor housing is made of high-strength, long glass fiber BMC material and is integrally formed by injection molding. During injection molding, the wound stator assembly 1 is first placed into the mold. During the injection molding, the motor housing 2 wraps the stator and is integrally formed. The motor housing 2 and the stator assembly 1 form a solid whole. Figure 2As shown, the assembly process of the stator assembly is saved. The enameled wire 12 of the stator assembly 1 is wrapped in the motor housing 2, which saves the process of stator varnishing after winding, thus simplifying the production process.

[0038] Specifically, the stator assembly 1 is first introduced. The stator assembly 1 according to the present disclosure includes a stator core 11 and an enameled wire. The stator assembly 1 can be, for example, Figure 3 The steps shown are formed. Figure 3 The assembly steps shown include five steps s1-s5, Figure 3 The stator components in the figure are all plan views observed along the axial direction. First, a straight stator core 11 is manufactured. The straight stator core 11 is connected into a straight bar by a plurality of connected "T"-shaped parts, as shown in s1. Then, the enameled wire 12 is wound on the straight stator core, specifically, the enameled wire is wound on each "T"-shaped part, as shown in s2. Due to the volume of the enameled wire itself, the enameled wire 12 protrudes from the stator core 11 on both sides in the axial direction of the stator core 11, as shown in Figure 1 and Figure 2 As shown. Further, optionally, a plurality of (for example, two as shown in the figure) straight stator cores can be selected and connected into a longer straight stator core, as shown in s3 and s4, and the connection can be achieved, for example, by welding, crimping, bonding, and other methods commonly used in the art. Furthermore, the straight stator core 11 is wrapped into a ring shape, and the two ends are connected, and the connection can be achieved, for example, by welding, crimping, bonding, and other methods commonly used in the art to form a ring-shaped stator assembly 1. The winding and circular welding in this assembly step can be completed fully automatically on the production line, which is conducive to industrial production.

[0039] Next, the motor housing 2 according to the present disclosure is described. The motor housing 2 is an integrated structure, such as an integrated injection molding structure. More specifically, during injection molding, the above-mentioned wound stator assembly 1 is first placed in a mold, and a BMC material, for example, is injected. During the molding process, the BMC material coats the enameled wire and solidifies and molds, and the motor housing 2 wraps the stator and is integrally molded, so that the motor housing 2 and the stator assembly 1 form a whole that is consolidated together. This reduces the process of pressing the motor stator into the shell, simplifies the production process, and is particularly suitable for the production of high-power motors. In addition, the BMC material is insulated to prevent leakage caused by the rupture of the enameled wire. In addition, the BMC material is also fireproof, explosion-proof, and corrosion-resistant, which improves the overall safety of the motor. In particular, the first cover and the second cover are also integrally injection molded by the BMC material, and have the advantages of the above-mentioned BMC material.

[0040] The motor housing 2 may be open at both ends in the axial direction thereof, specifically at the first end and the second end, and may be covered with a first cover 41 and a second cover 42 at the first end and the second end, respectively, as described in detail later. The motor housing 2 may include a housing wall 23, a first enameled wire fixing portion 21, a second enameled wire fixing portion 22, and a partition wall 24, such as Figure 1 and Figure 2 As shown. The first enameled wire fixing portion 21 and the second enameled wire fixing portion 22 are connected to the housing wall 23 and are spaced apart from each other. The partition wall 24 is perpendicular to the axial direction and divides the motor housing 2 into a first chamber 25 and a second chamber 26 (described in detail later), wherein the first chamber 25 accommodates the rotor assembly 3 (described in detail later). The partition wall 24 can be connected to the housing wall 23 through one of the first enameled wire fixing portion 21 and the second enameled wire fixing portion 22, as shown. Figure 2 As shown, it is connected to the housing wall 23 via the second enameled wire fixing portion 22 .

[0041] The shell wall 23 covers the annular outer surface of the stator core 11 to be fixed with the stator core 11, so that the stator core 11 is fixed relative to the motor housing 2 and provides protection for the stator core 11. Comparing the structure according to the present disclosure with the structure in which the motor housing and the stator assembly are connected by connecting ribs, the latter is not suitable for high-power motors due to the limited mechanical strength of the connecting ribs, because the stator assembly of the high-power motor is very heavy and cannot be supported by the connecting ribs alone. Once the connecting ribs are damaged, the motor will be damaged. This structure is unreliable and is particularly unsuitable for harsh working environments. According to the present disclosure, the shell wall 23 of the motor housing 2 is directly fixed with the annular outer surface of the stator assembly, which greatly improves the connection strength, has a good support effect on the large-mass stator, has a good shock absorption effect, and is particularly suitable for the manufacture of high-power motors.

[0042] Furthermore, the first enameled wire fixing portion 21 and the second enameled wire fixing portion 22 respectively cover the enameled wire 12 on both sides of the stator assembly 1 in the axial direction, and the first enameled wire fixing portion 21 and the second enameled wire fixing portion 22 fix the stator assembly 1 therebetween. During the injection molding process of the motor housing, the BMC material covers the enameled wire and solidifies it, and is connected to the inner surface of the one-piece molded housing at the same time. After the injection molding is completed, the first enameled wire fixing portion 21 and the second enameled wire fixing portion 22 are equivalent to a platform protruding radially toward the axis of the housing wall 23 of the motor housing 1, providing support for the stator assembly in the axial direction, and by covering and fixing the enameled wire, the vibration of the stator and the enameled wire caused by the vibration of the motor operation is reduced, vibration and noise are reduced, high-frequency harmonics are reduced, and losses are reduced.

[0043] The motor according to the present disclosure further includes a first cover 41 and a second cover 42, the first cover 41 and the second cover 42 cover the motor housing 2 at the first end and the second end of the motor housing 2, respectively. Figure 1 As shown. The distance between the first cover 41 and the stator assembly 1 is smaller than the distance between the second cover 42 and the stator assembly 1. Figure 1 At least one of the first cover 41 and the second cover 42 is provided with a through hole for allowing the rotating shaft 31 (described later) to extend out, in particular, as shown in FIG. Figure 1 As shown, both the first cover 41 and the second cover 42 have through holes for the rotating shaft 31 to pass through and extend out.

[0044] In addition, a first groove 411 is provided on one side of the first cover 41 facing the first chamber 25, and the first groove 411 is used to accommodate the first bearing 51. Figure 1 A second groove 241 is provided on one side of the partition wall 24 facing the first chamber 25. The second groove 241 is used to accommodate the second bearing 52. The rotating shaft 31 is pivotally matched with the first bearing 51 and the second bearing 52. Figure 1 The one-piece motor housing prevents electrical corrosion of the bearings and helps absorb bearing vibration, reduce vibration and noise.

[0045] The motor according to the present disclosure may further include a control circuit board 64 disposed in the motor, and the control circuit board 64 is used to control the operation of the motor. Specifically, the control circuit board is accommodated in the second chamber 26. The second chamber is arranged in consideration of the trend of integrated motor drive, and a space for accommodating the control circuit board is reserved inside the injection molded housing, so that the control circuit board can be built-in.

[0046] In particular, the control circuit board 64 is mounted on the second cover 42, and when the second cover 42 is matched with the second end, it is located in the second chamber 26. Mounting on the second cover 42 improves the stability of the control circuit board 64, helps prevent the support of the control circuit board 64, and strengthens the protection of the control circuit board 64. In addition, it is convenient for disassembly and assembly of the control circuit board 64, and when maintenance is required, the entire control circuit board 64 can be taken out from the motor housing by simply removing the second cover 42, which is convenient for subsequent maintenance.

[0047] Furthermore, the motor housing 2 also includes an electrical appliance display mounting portion 27, such as Figure 2 As shown, the electrical appliance display mounting portion 27 is connected to the outer periphery of the housing wall 24 for mounting a display component 61 and / or a control component 62. Figure 7 As shown, the display component 61 is used to display the parameters and operating status of the motor, and the control component 62 is used to apply instructions to the motor. In particular, the motor may also include a junction box 63 for accommodating electrical components such as leads, circuit boards, etc., on which the display component 61 and / or the control component 62 are installed, so as to provide additional protection for the electrical components. The arrangement of the electrical display mounting portion reserved outside the housing wall facilitates the setting of the motor operating parameters and the checking of the motor working status at any time, which meets market demand.

[0048] Figure 4 A schematic diagram of a portion of a rotor assembly 3 according to an embodiment of the present disclosure is shown. The rotor assembly 31 may include a plastic magnetic rotor frame 32 and a permanent magnet 33, wherein the rotor frame 32 is an annular structure made of a plastic magnetic material and symmetrical about the central axis, and the permanent magnet 33 is arranged in the rotor frame and symmetrical about the central axis of the rotor frame. In particular, a plurality of permanent magnet slots are arranged in the circumferential direction inside the plastic magnetic rotor frame 32, and the permanent magnets are arranged in the corresponding permanent magnet slots, and then the rotor assembly is formed by integral injection molding to fix the permanent magnets and increase the strength of the rotor assembly. In addition, the rotating shaft 31 and the rotor assembly 3 cooperate to pivot together, so as to transmit the pivoting motion of the rotor assembly 3 through the rotating shaft 31 to the load connected to the rotating shaft 31 and the optional cooling fan 71 (described later). The rotor assembly 3 of this structure is suitable for a low-power rotor structure, with a simple structure and stable movement.

[0049] Figure 5 A schematic diagram showing a portion of a rotor assembly 3 according to another embodiment of the present disclosure is shown. Figure 4 A magnetic ring 34 is also provided on the basis of the rotor assembly shown. The magnetic ring 34 is sleeved on the outer periphery of the plastic magnetic rotor frame 32, and the magnetic ring is composed of materials such as neodymium iron boron, samarium iron nitrogen, and samarium cobalt. Since a magnetic ring composed of permanent magnetic materials such as neodymium iron boron is provided on the periphery of the plastic magnetic rotor frame 32, the rotor has a composite magnetic circuit structure, which reduces the amount of materials such as neodymium iron boron while maintaining the rotor performance unchanged, thereby reducing costs. In addition, the magnetic ring provides additional strength, so it is used in high-power rotor structures.

[0050] Furthermore, if Figure 6 As shown, the motor according to the present disclosure may further include a cooling fan 71. The provision of the cooling fan may further increase the heat dissipation performance of the motor. The cooling fan 71 is preferably covered by a fan cover 72 (e.g. Figure 1 and Figure 7 In addition, the cooling fan 71 can be connected to the rotating shaft 31 through a speed change device 73 and driven by the rotating shaft. The speed change device can be a speed change device driven by a permanent magnet. This permanent magnet driven speed change device can make the cooling fan have a higher speed when the motor speed is low, thereby improving the heat dissipation efficiency of the motor. The power source is provided by the rotating shaft, and no additional heat dissipation power source is required, thereby improving the efficiency of the motor.

[0051] It should be understood that the above description is intended to illustrate rather than limit. For example, the above embodiments (and / or aspects thereof) can be used in combination with each other. In addition, without departing from the scope of the present disclosure, many modifications can be made to adapt specific situations or materials to the teachings of the present disclosure. The functions or performances of the various elements or modules described herein are only for illustration and are by no means restrictive, but are merely exemplary embodiments. After reading the above description, many other embodiments and modifications within the spirit and scope of the claims will be apparent to those skilled in the art. Therefore, the scope of the present disclosure should be determined with reference to the full scope of the equivalents given by the attached claims and these claims.

[0052] In the following claims, the terms “including” and “in which” are used as the plain-English equivalents of the respective terms “comprising” and “wherein.” Moreover, in the following claims, the terms “first,” “second,” and “third,” etc. are used merely as labels, and are not intended to impose numerical requirements on their objects.

Claims

1. A motor, characterized in that: include A stator assembly, a stator core having a circular ring structure and an enameled wire wound around the stator assembly, wherein the enameled wire protrudes from the stator core on both sides of the stator core in the axial direction. The motor housing is an integrated structure and is open at both ends in the axial direction. The motor housing includes a housing wall, a first enameled wire fixing portion and a second enameled wire fixing portion. The housing wall covers the annular outer surface of the stator core. The first enameled wire fixing portion and the second enameled wire fixing portion are connected to the housing wall and cover the enameled wires on both sides of the axial direction of the stator assembly respectively. The first enameled wire fixing portion and the second enameled wire fixing portion fix the stator assembly therebetween. a rotor assembly, magnetically matched with the stator assembly and pivotally mounted to the motor housing relative to the stator assembly, a rotating shaft, cooperating with the rotor assembly to pivot together, a first cover, covering the motor housing at a first end of the motor housing, a second cover, covering the motor housing at a second end of the motor housing, wherein the distance between the first cover and the stator assembly is smaller than the distance between the second cover and the stator assembly, At least one of the first cover and the second cover is provided with a through hole allowing the rotating shaft to extend out.

2. The motor according to claim 1, characterized in that The motor housing further includes a partition wall that is perpendicular to the axial direction and partitions the motor housing into a first chamber and a second chamber, the first chamber accommodating the rotor assembly.

3. The motor according to claim 2, characterized in that The motor also includes a control circuit board for controlling the operation of the motor. The control circuit board is accommodated in the second chamber.

4. The motor according to claim 3, characterized in that The control circuit board is mounted on the second cover.

5. The motor according to claim 2, characterized in that: A first groove is provided on a side of the first cover facing the first chamber, and the first groove is used to accommodate a first bearing.

6. The motor according to claim 5, characterized in that A second groove is provided on one side of the partition wall facing the first chamber. The second groove is used to accommodate a second bearing. The rotating shaft is pivotally matched with the first bearing and the second bearing.

7. The motor according to claim 6, characterized in that The rotor assembly comprises a plastic magnetic rotor frame and permanent magnets. The rotor frame is an annular structure made of plastic magnetic material and symmetrical about a central axis. The permanent magnets are arranged in the rotor frame and symmetrical about the central axis.

8. The motor according to claim 7, characterized in that The outer periphery of the plastic magnetic rotor frame is sleeved with a magnetic ring made of permanent magnetic material.

9. The motor according to claim 2, characterized in that The partition wall is connected to the housing wall via one of a first enameled wire fixing portion and a second enameled wire fixing portion.

10. The motor according to claim 1, characterized in that The motor housing also includes an electrical display mounting portion, which is connected to the outer periphery of the housing wall and is used to mount a display component and / or a control component. The display component is used to display the parameters and operating status of the motor, and the control component is used to apply instructions to the motor.

11. The motor according to any one of claims 1 to 10, characterized in that: The motor further comprises a cooling fan, which is connected to the rotating shaft via a speed changing device and driven by the rotating shaft.

12. The motor according to any one of claims 1 to 10, characterized in that: The motor housing, the first cover and the second cover are all structures integrally injection-molded by BMC material.

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