High air gap flux density structure in magnetic circuit of rotating mechanism

Abstract

The invention provides a high air gap flux density structure in a magnetic circuit of a rotating mechanism, which belongs to the technical field of rotating motors and comprises a shell assembly, a rotor assembly arranged in the shell assembly and a rotating shaft assembly used for supporting the rotor assembly. The rotor assembly comprises a permanent magnet set and flange covers arranged at the two ends of the permanent magnet set and used for fixing the permanent magnet set. According to the high air gap flux density structure in the magnetic circuit of the rotating mechanism provided by the invention, a structure with two fixed ends is adopted, so that the distance between the permanent magnet and the magnetizer is further reduced, the air gap flux density is high, the motor output torque is high, and the power density of the motor is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of rotating electrical machines, and in particular provides a high air gap magnetic density structure in a magnetic circuit of a rotating mechanism. Background Art

[0002] In motor design, the size of the air gap flux determines the size of the motor torque coefficient, and the size of the torque coefficient determines the size of the motor output torque under the same current, thereby determining the size of the motor power density. The air gap flux is closely related to the size of the air gap, so reducing the air gap distance will significantly increase the size of the air gap flux. At present, the effective air gap distance of the rotating motor is affected by the rotor permanent magnet sleeve and is difficult to further reduce, so that the effective air gap distance is subject to certain restrictions and it is difficult to meet the use requirements of high air gap flux. Summary of the invention

[0003] The purpose of this application is to address the problem that the air gap of existing rotating motors is difficult to further reduce, and to propose a high air gap magnetic density structure with fixed two ends to further reduce the distance between the permanent magnet and the magnetic conductor, thereby increasing the air gap magnetic density, making the motor output higher torque, and improving the power density of the motor.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a high air gap magnetic density structure in the magnetic circuit of a rotating mechanism, comprising a shell assembly, a rotor assembly arranged in the shell assembly, and a rotating shaft assembly for supporting the rotor assembly, the rotor assembly comprising a permanent magnet group and flange covers arranged at both ends of the permanent magnet group for fixing the permanent magnet group.

[0005] The high air gap magnetic density structure in the magnetic circuit of the rotating mechanism provided by the present invention also has the following technical features: the shell assembly includes a shell, a magnetic circuit element fixed in the shell and cooperating with the rotor assembly, and an end cover cooperating with the shell to support the rotating shaft assembly; the shell and the end cover are fixed by countersunk screws.

[0006] The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism provided by the present invention also has the following technical features: the rotor assembly also includes a support frame for fixing the permanent magnet group, the support frame is arranged on the inner circle of the permanent magnet group, and the support frame is connected to the flange cover by screws.

[0007] The high air gap magnetic density structure in the magnetic circuit of the rotating mechanism provided by the present invention also has the following technical feature: the support frame is provided with a keyway for fixing the support frame on the rotating shaft assembly.

[0008] The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism provided by the present invention also has the following technical characteristics: the permanent magnet group includes an even number of evenly distributed permanent magnets, and the radial polarities of adjacent permanent magnets are opposite.

[0009] The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism provided by the present invention also has the following technical features: the flange cover is a disc structure, and the disc structure is provided with a flange cover lip for fixing the permanent magnet group, the inner circular surface of the flange cover lip of the flange cover lip is used to fix the permanent magnet group, and both ends of the permanent magnets in the permanent magnet group are provided with permanent magnet radial fixing circular surfaces for permanent magnet installation, the permanent magnet radial fixing step surface is tightly matched with the inner circular surface of the flange cover lip, the flange cover lip end face of the flange cover lip is aligned with the axial installation step surface of the permanent magnet, and the wall thickness between the inner circular surface of the flange cover lip and the outer circle of the flange cover is not greater than the height of the axial installation step surface of the permanent magnet.

[0010] The high air gap magnetic density structure in the magnetic circuit of the rotating mechanism provided by the present invention also has the following technical features: the rotating shaft assembly includes a rotating shaft passing through the rotor assembly and a gear arranged at one end of the rotating shaft.

[0011] The high air gap magnetic density structure in the magnetic circuit of the rotating mechanism provided by the present invention also has such technical characteristics that the magnetic density structure also includes a spacer ring arranged between the rotor assembly and the housing assembly, a bearing for supporting and connecting the rotor assembly and the housing assembly, and a flat key for connecting the rotor assembly and the shaft assembly.

[0012] The high air gap magnetic density structure in the rotating mechanism magnetic circuit provided by the present invention also has the following technical characteristics: the magnetic circuit element is one selected from a hysteresis ring, a motor coil stator lamination assembly or a hollow cup coil assembly, and the magnetic circuit element is fixed concentrically with the shell.

[0013] Beneficial Effects

[0014] The high air gap flux density structure in the rotating mechanism magnetic circuit provided by the present invention adopts a structure with fixed ends, so that the distance between the permanent magnet and the magnetizer is further reduced, the air gap flux density is high, the motor output torque is high, and the power density of the motor is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A half-section schematic diagram of an assembly of a high air gap magnetic density structure provided by the present invention;

[0017] Figure 2 A schematic diagram of the assembly of a rotor assembly provided by an embodiment of the present invention;

[0018] Figure 3 A partially enlarged schematic diagram of the assembly cross section of a rotor assembly provided in an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of the permanent magnet structure provided by an embodiment of the present invention;

[0020] Figure 5 A schematic diagram of the structure of a flange cover provided in an embodiment of the present invention;

[0021] Figure 6 A partially enlarged schematic diagram of a cross section of a flange cover provided in an embodiment of the present invention;

[0022] Figure 7 A schematic diagram of a support structure provided by an embodiment of the present invention;

[0023] Figure 8 A schematic diagram of the structure of a magnetic circuit element provided in an embodiment of the present invention,

[0024] Among them, 1: shaft assembly; 2: bearing; 3: housing assembly; 4: rotor assembly; 5: magnetic circuit element; 6: countersunk screw; 7: bearing cover; 8: gear; 9: first spacer ring; 10: flat key; 11: second spacer ring; 12: flange cover; 12a: countersunk hole; 12b: inner circular surface of flange cover lip; 12c: center hole of flange cover; 12e: end surface of flange cover lip; 13: support frame; 13a: keyway; 13b: bracket mounting surface; 14: permanent magnet; 14a: radial fixing circular surface of permanent magnet; 14b: working surface of permanent magnet pole; 14c: axial mounting step surface of permanent magnet; 14d: side surface of permanent magnet; 14e: mounting surface of permanent magnet; 15: countersunk screw. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings and examples, but it should be noted that these implementation methods are not limitations of the present application, and equivalent changes or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these implementation methods are all within the scope of protection of the present application.

[0026] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the creation of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the creation of the present application.

[0027] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0028] 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 an indirect connection 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 invention of this application can be understood by specific circumstances.

[0029] like Figure 1-8 As shown, an embodiment of the present application provides a high air gap magnetic density structure in the magnetic circuit of a rotating mechanism, including a shell assembly 3, a rotor assembly 4 arranged in the shell assembly 3, and a shaft assembly 1 for supporting the rotor assembly 4, wherein the rotor assembly 4 includes a permanent magnet group and flange covers 12 arranged at both ends of the permanent magnet group for fixing the permanent magnet group.

[0030] In some embodiments, the housing assembly 3 includes a housing, a magnetic circuit element 5 fixed in the housing and cooperating with the rotor assembly, and a bearing cover 7 cooperating with the housing to support the shaft assembly. The housing and the end cover are fixed by countersunk screws 6.

[0031] In some embodiments, the rotor assembly 4 also includes a support frame 13 for fixing the permanent magnet group, the support frame 13 is arranged on the inner circle of the permanent magnet group, the permanent magnet mounting surface 14e is fitted and fixedly connected with the bracket mounting surface 13b, and the permanent magnet side surfaces 14d of adjacent permanent magnets 14 are reinforced with permanent magnet glue, and the glue can be optionally anchor 101 glue, and the support frame 13 and the countersunk screw 15 pass through the countersunk hole 12a to connect the flange cover 12 to the support frame 13.

[0032] In some embodiments, the support frame 13 is provided with a keyway 13 a for fixing the support frame 13 on the shaft assembly 1 .

[0033] In some embodiments, the permanent magnet group includes an even number of evenly distributed permanent magnets, and the radial polarities of adjacent permanent magnets are opposite.

[0034] In some embodiments, the flange cover 12 is a disc structure, and the disc structure is provided with a flange cover lip for fixing the permanent magnet group, and the inner circular surface 12b of the flange cover lip is used to fix the permanent magnet group, and both ends of the permanent magnets 14 in the permanent magnet group are provided with permanent magnet radial fixing circular surfaces 14a for permanent magnet installation, and the permanent magnet radial fixing step surface 14a is tightly matched with the inner circular surface 12b of the flange cover lip, and the flange cover lip end surface 12e of the flange cover lip is aligned with the permanent magnet axial installation step surface 14c, and the wall thickness between the inner circular surface 12b of the flange cover lip and the outer circle of the flange cover 12 is not greater than the height of the permanent magnet axial installation step surface 14c. The center hole 12c of the flange cover is concentrically sleeved on the shaft assembly 1.

[0035] In some embodiments, the shaft assembly 1 includes a shaft passing through the rotor assembly 4 and a gear disposed at one end of the shaft.

[0036] In some embodiments, the magnetic density structure further includes a spacer ring disposed between the rotor assembly 4 and the housing assembly 3, a bearing 2 for supporting and connecting the rotor assembly 4 and the housing assembly 3, and a flat key 10 for connecting the rotor assembly 4 and the shaft assembly 1. The spacer ring includes a first spacer ring 9 and a second spacer ring 10.

[0037] In some embodiments, the magnetic circuit element 5 is one selected from a hysteresis ring, a motor coil stator lamination assembly, or a coreless cup coil assembly.

[0038] In some embodiments, the magnetic circuit element 5 is a hysteresis ring, and the working air gap between the inner diameter of the hysteresis ring and the working surface 14b of the permanent magnet pole of the outer diameter of the rotor assembly is 0.1 mm to 0.3 mm.

[0039] In some embodiments, the magnetic circuit element 5 is a motor coil stator lamination assembly, and the working air gap between the inner diameter of the motor coil stator lamination assembly and the outer diameter of the permanent magnet pole working surface 14b of the rotor assembly 4 is 0.1mm to 0.3mm.

[0040] In some embodiments, the magnetic circuit element 5 is a coreless coil assembly, and the working air gap between the inner diameter of the coreless coil assembly and the working surface 14b of the permanent magnet pole of the outer diameter of the rotor assembly is 0.1 mm to 0.3 mm.

[0041] In some embodiments, the shell of the shell assembly 3 is provided with an integral gear on its circumference, or it may be a separate gear, so that the shell is connected to an external transmission for rotation.

[0042] In some embodiments, the shell of the shell assembly 3 is constrained to be fixed and not to rotate.

[0043] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A high air gap magnetic density structure in a rotating mechanism magnetic circuit, characterized in that: It includes a housing assembly, a rotor assembly arranged in the housing assembly, and a rotating shaft assembly for supporting the rotor assembly. The rotor assembly includes a permanent magnet group and flange covers arranged at two ends of the permanent magnet group for fixing the permanent magnet group.

2. The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism according to claim 1, characterized in that: The housing assembly comprises a housing, a magnetic circuit element fixed in the housing and cooperating with the rotor assembly, and an end cover cooperating with the housing and used to support the shaft assembly. The shell and the end cover are fixed by countersunk screws.

3. The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism according to claim 1, characterized in that: The rotor assembly also includes a support frame for fixing the permanent magnet group, the support frame is arranged on the inner circle of the permanent magnet group, and the support frame is connected to the flange cover by screws.

4. The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism according to claim 3, characterized in that: The support frame is provided with a keyway for fixing the support frame on the rotating shaft assembly.

5. The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism according to claim 1, characterized in that: The permanent magnet group includes an even number of evenly distributed permanent magnets, and the radial polarities of adjacent permanent magnets are opposite.

6. The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism according to claim 1, characterized in that: The flange cover is a disc structure, and the disc structure is provided with a flange cover lip for fixing the permanent magnet group. The inner circular surface of the flange cover lip of the flange cover lip is used to fix the permanent magnet group, and both ends of the permanent magnets in the permanent magnet group are provided with permanent magnet radial fixing circular surfaces for permanent magnet installation, the permanent magnet radial fixing step surface is tightly matched with the inner circular surface of the flange cover lip, the flange cover lip end face of the flange cover lip is aligned with the axial installation step surface of the permanent magnet, and the wall thickness between the inner circular surface of the flange cover lip and the outer circle of the flange cover is not greater than the height of the axial installation step surface of the permanent magnet.

7. The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism according to claim 1, characterized in that: The rotating shaft assembly comprises a rotating shaft passing through the rotor assembly and a gear arranged at one end of the rotating shaft.

8. The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism according to claim 1, characterized in that: The magnetic density structure also includes a spacer ring arranged between the rotor assembly and the housing assembly, a bearing for supporting and connecting the rotor assembly and the housing assembly, and a flat key for connecting the rotor assembly and the rotating shaft assembly.

9. The high air gap magnetic flux density structure in the magnetic circuit of the rotating mechanism according to claim 2, characterized in that: The magnetic circuit element is one selected from a hysteresis ring, a motor coil stator lamination assembly or a hollow cup coil assembly, and the magnetic circuit element is fixed concentrically with the shell.

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