Dynamic balancing test method for outer rotor of permanent magnet direct drive motor

Abstract

A dynamic balancing test method for an outer rotor of a permanent magnet direct drive motor, comprising: assembling a dynamic balancing dummy shaft (1), a left expansion sleeve (2), a right expansion sleeve (3), a front end cover (8), a rear end cover (6) and a rotor (7) into a whole; numbering the components and drawing corresponding marking lines, then detaching the whole dynamic balancing dummy shaft (1) from the rotor (7), and then on the basis of the corresponding marking lines, reassembling the dynamic balancing dummy shaft (1), the right expansion sleeve (3) and a locking nut (4); on the basis of set parameters, performing a dynamic balancing test on the whole assembled dynamic balancing dummy shaft (1); then on the basis of the corresponding marking lines, reassembling the dynamic balancing dummy shaft (1) to the rotor (7); and on the basis of set parameters, reducing the weight of the entire rotor (7) having the dynamic balancing dummy shaft (1) by means of weight reduction bosses reserved at two ends of the rotor (7), so as to complete dynamic balancing check of the rotor (7).

Description

A dynamic balancing test method for the outer rotor of a permanent magnet direct-drive motor Technical Field

[0001] The present invention relates to the technical field of dynamic balance verification, and in particular to a dynamic balance test method for an outer rotor of a permanent magnet direct-drive motor. Background Art

[0002] At present, the rotor of conventional permanent magnet direct drive motor has an inner rotor structure, and the dynamic balancing of the rotor adopts the weighting method of adding balancing blocks to perform dynamic balancing verification, so as to ensure that the rotor imbalance after dynamic balancing meets the design requirements. This method is only applicable to rotors with a rotating shaft, which is convenient for the dynamic balancing machine to support, and the balancing block mounting grooves or mounting screw holes are processed on the pressure plates at both ends of the rotor. However, for the new outer rotor with no rotating shaft structure and no balancing block mounting grooves or mounting screw holes at both ends, the existing method cannot be used for dynamic balancing verification. How to achieve reliable, safe and efficient dynamic balancing test for the motor rotor of this new structure is a problem that must be solved in motor manufacturing technology.

[0003] Based on this, the applicant proposed a dynamic balancing test method for the outer rotor of a permanent magnet direct-drive motor to solve the above technical problems. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for dynamic balancing the outer rotor of a permanent magnet direct-drive motor.

[0005] The present invention is solved by the following technical solutions:

[0006] A method for dynamic balancing an outer rotor of a permanent magnet direct drive motor comprises the following steps:

[0007] Step A: Install the front end cover and the rear end cover to the corresponding positions at both ends of the rotor and tighten the bolts, and mark A at the same time;

[0008] Step B: Install the left expansion sleeve and the right expansion sleeve onto the rear end cover and the front end cover respectively, install the front outer cover onto the front end cover and tighten the bolts, and mark B.

[0009] Step C: Lift the assembled rotor vertically and place it on a vertical support platform with the front end facing downward. Lift the dynamic balancing dummy shaft to the top of the rotor, align it with the center of the rotor, and slowly lower it until the front and rear conical surfaces of the dynamic balancing dummy shaft contact the right and left expansion sleeves respectively. Install the lock nut onto the corresponding thread on the front end of the dynamic balancing dummy shaft and tighten it. Mark C at the same time.

[0010] Step D: After disassembling the balancing dummy shaft, front end outer cover, lock nut and right expansion sleeve assembled on the rotor, reinstall the right expansion sleeve on the front end conical surface of the balancing dummy shaft according to mark C, and re-tighten the lock nut in place according to mark C. Hoist the reassembled balancing dummy shaft, right expansion sleeve and lock nut onto the automatic weight removal balancing machine, set the dynamic balancing machine parameter S, start the automatic weight removal balancing machine to complete the dynamic balancing test of the dynamic balancing dummy shaft as a whole and record the final imbalance on both sides. 、 ;

[0011] Step E: Remove the locking nut and right expansion sleeve on the dynamic balancing dummy shaft. Reassemble the disassembled right expansion sleeve, dynamic balancing dummy shaft and the front end outer cover removed in step D with the rotor according to mark B and mark C respectively. Then tighten the locking nut according to mark C. Hoist the assembled rotor as a whole onto the automatic weight removal dynamic balancing machine, set the dynamic balancing machine parameter Q, start the automatic weight removal dynamic balancing machine to complete the rotor weight removal dynamic balancing test and record the final imbalance on both sides. 、 ;

[0012] Step F: Lift the rotor as a whole onto the vertical support platform, remove the locking nut, dynamic balancing dummy shaft, left expansion sleeve and right expansion sleeve, turn the rotor over and place it horizontally, and remove the front outer cover, rear outer cover, front end cover and rear end cover.

[0013] Preferably, the mark A in step A includes an identification line A marked at the connection between the rotor and the front end cover corresponding to the position of the front end cover, and an identification line B marked at the connection between the rotor and the rear end cover corresponding to the position of the rear end cover.

[0014] Preferably, the mark A in step A also includes a number marked on the head of each bolt, and the same number marked on the position of the corresponding bolt on the front end cover and the rear end cover.

[0015] Preferably, the mark B in step B includes an identification line C marked at the connection between the left expansion sleeve and the rear end cover, which corresponds to the position of the rear end cover, and an identification line D marked at the connection between the right expansion sleeve and the front end cover, which corresponds to the position of the front end cover. It also includes an identification line E marked at the connection between the front outer cover and the front end cover, which corresponds to the position of the front end cover.

[0016] Preferably, in step C, the dynamic balancing dummy shaft is hoisted through the process screw holes provided at the rear end.

[0017] Preferably, the mark C in step C includes an identification line F marked at the connection between the rear end conical surface of the dynamic balancing dummy shaft and the left expansion sleeve, and an identification line G marked at the connection between the front end conical surface of the dynamic balancing dummy shaft and the right expansion sleeve.

[0018] Preferably, the mark C in step C also includes an anti-loosening marking line marked at the connection between the dynamic balancing dummy shaft and the locking nut.

[0019] Preferably, the dynamic balancing machine parameters S in step D include the distance a from the dynamic balancing machine roller support point to the rear end dummy shaft deweighting point, the distance b from the rear end dummy shaft deweighting point to the front end dummy shaft deweighting point, the distance c from the front end dummy shaft deweighting point to the dynamic balancing machine roller support point, the working radius of the front end dummy shaft deweighting point, and the distance c from the front end dummy shaft deweighting point to the dynamic balancing machine roller support point. And the working radius of the rear end fake shaft de-weighting The speed of the dynamic balancing machine is set according to the rated speed N of the motor, and the maximum allowable unbalance is calculated according to the national standard G1.0. 、 set up,

[0020] According to the dynamic balance calculation of the rigid rotor,

[0021] ,

[0022] ,

[0023] And the unbalance calculation formula,

[0024] ,

[0025] Where, Indicates the permissible unbalance per unit mass of the rotor ( ), represents the rotor operating angular velocity, ,in is the rotor speed, Indicates the balance level, which is divided into 11 balance levels. Indicates the allowable unbalance of the rotor. represents the rotor mass, Indicates the permissible residual unbalance for each correction plane, Indicates the working radius,

[0026] get,

[0027] ,

[0028] .

[0029] Preferably, middle, .

[0030] Preferably, the dynamic balancing machine parameters Q in step E include the distance A from the dynamic balancing machine roller support point to the rear end weight removal boss, the distance B from the rear end weight removal boss to the front end weight removal boss, the distance C from the front end weight removal boss to the dynamic balancing machine roller support point, and the working radius of the front end weight removal boss. And the working radius of the rear end de-weighting boss The speed of the dynamic balancing machine is set according to the rated speed N of the motor, and the maximum allowable unbalance is calculated according to the national standard G2.5. 、 set up,

[0031] According to the dynamic balance calculation of the rigid rotor,

[0032] ,

[0033] ,

[0034] And the unbalance calculation formula,

[0035] ,

[0036] Where, Indicates the permissible unbalance per unit mass of the rotor ( ), represents the rotor operating angular velocity, ,in is the rotor speed, Indicates the balance level, which is divided into 11 balance levels. Indicates the allowable unbalance of the rotor. represents the rotor mass, Indicates the permissible residual unbalance for each correction plane, Indicates the working radius,

[0037] get,

[0038] ,

[0039] .

[0040] Preferably, middle, .

[0041] Preferably, after the rotor weight removal dynamic balancing test is completed in step E, uniform numbers are marked on the surfaces of the rotor and the joints of each component.

[0042] Preferably, the taper of the front end tapered surface and the rear end tapered surface is the same as the taper of the tapered surface A in the left expansion sleeve and the tapered surface B in the right expansion sleeve, and the taper ranges from 15 degrees to 20 degrees.

[0043] Preferably, the roughness of the front end tapered surface and the rear end tapered surface is no more than 1.6 microns.

[0044] Preferably, the contact rate between the left expansion sleeve and the rear end conical surface and the contact rate between the right expansion sleeve and the front end conical surface are both not less than 85%.

[0045] Preferably, the axial width of the front end conical surface is greater than the width of the corresponding mounting groove A in the front end end cover, and the axial width of the rear end conical surface is greater than the width of the corresponding mounting groove B in the rear end end cover.

[0046] Preferably, the surface roughness of the left expansion sleeve and the right expansion sleeve is not greater than 1.6 microns.

[0047] Preferably, the left expansion sleeve and the rear end cover adopt a transition fit, and the right expansion sleeve and the front end cover adopt a transition fit.

[0048] Preferably, the locking nut includes a large end circular ring portion and a small head portion, the outer diameter of the large end circular ring portion is smaller than the inner diameter of the front end outer cover, the inner diameter of the large end circular ring portion is larger than the minimum diameter of the tapered surface B, and the small head portion is processed into a hexagonal nut shape.

[0049] The beneficial effects of the present invention are: realizing dynamic balancing verification of an outer rotor with a new shaftless structure and no balancing block mounting slots or mounting screw holes at both ends; the device has a simple and reliable structure, strong practicality, convenient operation and maintenance, low cost, easy disassembly and assembly, and is suitable for small-batch manufacturing of new outer rotors. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying any creative work.

[0051] FIG1 is a schematic diagram of the overall structure of the permanent magnet direct drive motor outer rotor dynamic balancing test fixture with the rotor of the present invention.

[0052] FIG2 is a reference diagram of the overall dynamic balancing parameters of the rotor of the permanent magnet direct drive motor outer rotor dynamic balancing test fixture of the present invention.

[0053] FIG3 is a schematic diagram of the vertical installation structure of the permanent magnet direct drive motor outer rotor dynamic balancing test fixture of the present invention.

[0054] FIG4 is a schematic diagram of the structure of the permanent magnet direct drive motor outer rotor dynamic balancing test fixture of the present invention.

[0055] FIG5 is a reference diagram of test parameters of a tooling for a dynamic balancing test of an outer rotor of a permanent magnet direct drive motor according to the present invention.

[0056] FIG6 is a cross-sectional view of the dynamic balancing dummy shaft structure of the present invention.

[0057] FIG7 is a schematic structural diagram of the locking nut of the present invention.

[0058] FIG8 is a cross-sectional view of the locking nut structure of the present invention.

[0059] FIG9 is a schematic diagram of the left expansion sleeve of the present invention.

[0060] FIG10 is a schematic diagram of a rotational cross-section taken along line AA in FIG9 .

[0061] FIG11 is a cross-sectional schematic diagram of a section taken along line BB in FIG10 .

[0062] FIG12 is a schematic diagram of the right expansion sleeve of the present invention.

[0063] FIG13 is a schematic diagram of a rotational cross-section taken along line CC of FIG12 .

[0064] FIG14 is a schematic cross-sectional view taken along line DD in FIG13 .

[0065] In the figure: 1. Dynamic balancing dummy shaft, 2. Left expansion sleeve, 3. Right expansion sleeve, 4. Locking nut, 5. Rear end outer cover, 6. Rear end end cover, 7. Rotor, 8. Front end cover, 9. Front end outer cover, 10. Vertical support platform, 11. Process screw hole, 12. Rear end conical surface, 13. Front end conical surface, 14. Thread. Implementation Method

[0066] The following will provide a clear and complete description of the technical solutions of various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments described in the present invention, all other embodiments derived by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0067] As shown in Figures 1 to 14, a method for dynamic balancing the outer rotor of a permanent magnet direct drive motor includes the following steps: Step A: Install the front end cover 8 and the rear end cover 6 to the corresponding positions at both ends of the rotor 7, use a marker to mark the position identification line A corresponding to the front end cover 8 at the connection between the rotor 7 and the front end cover 8, and mark the position identification line B corresponding to the rear end cover 6 at the connection between the rotor 7 and the rear end cover 6, and tighten the bolts, mark the number on each bolt head with a marker, and mark the same position on the front end cover 8 and the rear end cover 6 with a marker. Numbering; Step B: Install the left expansion sleeve 2 and the right expansion sleeve 3 onto the rear end cover 6 and the front end cover 8 respectively, use a marker to mark the position identification line C corresponding to the rear end cover 6 at the connection between the left expansion sleeve 2 and the rear end cover 6, and mark the position identification line D corresponding to the front end cover 8 at the connection between the right expansion sleeve 3 and the front end cover 8, install the front end cover 9 onto the front end cover 8 and tighten the bolts, use a marker to mark the position identification line E corresponding to the front end cover 8 at the connection between the front end cover 9 and the front end cover 8; Step C: Lift the assembled rotor 7 vertically and place it on the vertical support platform 1 with the front end facing down 0, lift the dynamic balancing dummy shaft 1 to the top of the rotor 7 through the process screw hole 11 set at the rear end, align it with the center of the rotor 7 and slowly drop it until the front end conical surface 13 and the rear end conical surface 12 of the dynamic balancing dummy shaft 1 are respectively in contact with the right expansion sleeve 3 and the left expansion sleeve 2, use a marker to mark the identification line F at the connection between the rear end conical surface 12 of the dynamic balancing dummy shaft 1 and the left expansion sleeve 2, and mark the identification line G at the connection between the front end conical surface 13 of the dynamic balancing dummy shaft 1 and the right expansion sleeve 3, install the locking nut 4 on the corresponding thread 14 at the front end of the dynamic balancing dummy shaft 1 and complete the tightening, use a marker to mark the dynamic balancing dummy shaft 1 and the locking nut Mark the anti-loosening mark line at the connection of nut 4; Step D: After disassembling the dynamic balancing dummy shaft 1, front end outer cover 9, locking nut 4 and right expansion sleeve 3 assembled on the rotor 7, reinstall the right expansion sleeve 3 on the front end conical surface 13 of the dynamic balancing dummy shaft 1 according to mark C, and re-tighten the locking nut 4 in place according to mark C. Hoist the reassembled dynamic balancing dummy shaft 1, right expansion sleeve 3 and locking nut 4 as a whole onto the automatic weight removal dynamic balancing machine, set the dynamic balancing machine parameter S, start the automatic weight removal dynamic balancing machine to complete the dynamic balancing test of the dynamic balancing dummy shaft as a whole and record the final imbalance on both sides. Step E: Remove the locking nut 4 and the right expansion sleeve 3 on the dynamic balancing dummy shaft 1. Reassemble the disassembled right expansion sleeve 3, the dynamic balancing dummy shaft 1, and the front end outer cover 9 removed in step D with the rotor 7 according to marks B and C respectively. Then tighten the locking nut 4 according to mark C. Hoist the assembled rotor 7 as a whole onto the automatic weight removal dynamic balancing machine, set the dynamic balancing machine parameter Q, start the automatic weight removal dynamic balancing machine to complete the rotor weight removal dynamic balancing test and record the final imbalance on both sides. , mark the surfaces of the rotor 7 and the joints of each component with a marker; Step F: hoist the rotor 7 as a whole onto the vertical support platform 10, remove the locking nut 4, the dynamic balancing dummy shaft 1, the left expansion sleeve 2 and the right expansion sleeve 3, turn the rotor 7 over and place it horizontally, and remove the front outer cover 9, the rear outer cover 5, the front end cover 8 and the rear end cover 6.

[0068] The dynamic balancing machine parameters S in step D include the distance a from the dynamic balancing machine roller support point to the rear end dummy shaft weight removal point, the distance b from the rear end dummy shaft weight removal point to the front end dummy shaft weight removal point, the distance c from the front end dummy shaft weight removal point to the dynamic balancing machine roller support point, and the working radius of the front end dummy shaft weight removal point. And the working radius of the rear end fake shaft de-weighting The speed of the dynamic balancing machine is set according to the rated speed N of the motor, and the maximum allowable unbalance is calculated according to the national standard G1.0. set up,

[0069] According to the dynamic balance calculation of the rigid rotor,

[0070] ,

[0071] ,

[0072] And the unbalance calculation formula,

[0073] ,

[0074] Where, Indicates the permissible unbalance per unit mass of the rotor ( ), represents the rotor operating angular velocity, ,in is the rotor speed, Indicates the balance level, which is divided into 11 balance levels. Indicates the allowable unbalance of the rotor. represents the rotor mass, Indicates the permissible residual unbalance for each correction plane, Indicates the working radius,

[0075] get,

[0076] ,in ,

[0077] ,in .

[0078] when and , the test is qualified, otherwise it is necessary to continue to remove duplicates and test again until it is qualified.

[0079] The dynamic balancing machine parameters Q in step E include the distance A from the dynamic balancing machine roller support point to the rear end weight removal boss, the distance B from the rear end weight removal boss to the front end weight removal boss, the distance C from the front end weight removal boss to the dynamic balancing machine roller support point, and the working radius of the front end weight removal boss. And the working radius of the rear end de-weighting boss The speed of the dynamic balancing machine is set according to the rated speed N of the motor, and the maximum allowable unbalance is calculated according to the national standard G2.5. 、 set up,

[0080] According to the dynamic balance calculation of the rigid rotor,

[0081] ,

[0082] ,

[0083] And the unbalance calculation formula,

[0084] ,

[0085] Where, Indicates the permissible unbalance per unit mass of the rotor ( ), represents the rotor operating angular velocity, ,in is the rotor speed, Indicates the balance level, which is divided into 11 balance levels. Indicates the allowable unbalance of the rotor. represents the rotor mass, Indicates the permissible residual unbalance for each correction plane, Indicates the working radius,

[0086] get,

[0087] ,in ,

[0088] ,in .

[0089] when and , the test is qualified, otherwise it is necessary to continue to remove duplicates and test again until it is qualified.

[0090] The taper of the front end conical surface 13 and the rear end conical surface 12 is the same as the taper of the taper surface A in the left expansion sleeve 2 and the taper surface B in the right expansion sleeve 3, and the taper range is 15 degrees to 20 degrees. The roughness of the front end conical surface 13 and the rear end conical surface 12 is not greater than 1.6 microns. The contact rate between the left expansion sleeve 2 and the rear end conical surface 12 and the contact rate between the right expansion sleeve 3 and the front end conical surface 13 are not less than 85%. The axial width of the front end conical surface 13 is greater than the width of the corresponding mounting groove A in the front end cover 8. The axial width of the rear end conical surface 12 is greater than the width of the corresponding mounting groove B in the rear end cover 6. The surface roughness of the left expansion sleeve 2 and the right expansion sleeve 3 is not greater than 1.6 microns. The left expansion sleeve 2 and the rear end cover 6 adopt a transition fit, and the right expansion sleeve 3 and the front end cover 8 adopt a transition fit. The locking nut 4 includes a large end circular ring portion and a small head portion. The outer diameter of the large end circular ring portion is smaller than the inner diameter of the front end outer cover 9, and the inner diameter of the large end circular ring portion is greater than the minimum diameter of the tapered surface B. The small head portion is processed into a hexagonal nut shape.

[0091] In other embodiments, the dynamic balancing dummy shaft 1 and the rotor 7 may be fixed by means of bolts or the like.

[0092] In other embodiments, the rotor de-weighting dynamic balancing test can be verified by welding the balancing block using a weighting method.

[0093] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference numerals in the claims should not be construed as limiting the claim to which they relate.

[0094] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0095] Type your sequence listing free description paragraph here.

Claims

1. A dynamic balance test method for the outer rotor of a permanent magnet direct drive motor, characterized in that: It includes the following steps: Step A: Install the front end cover (8) and the rear end cover (6) to the corresponding positions at both ends of the rotor (7) respectively and tighten the bolts. Mark the corresponding position marking line A of the front end cover (8) at the connection between the rotor (7) and the front end cover (8), and mark the corresponding position marking line B of the rear end cover (6) at the connection between the rotor (7) and the rear end cover (6). Mark the number on the head of each bolt, and mark the same number at the positions of the corresponding bolts on the front end cover (8) and the rear end cover (6); Step B: Install the left expansion sleeve (2) and the right expansion sleeve (3) to the rear end cover (6) and the front end cover (8) respectively. Install the front outer cover (9) to the front end cover (8) and tighten the bolts. Mark the corresponding position marking line C of the rear end cover (6) at the connection between the left expansion sleeve (2) and the rear end cover (6), and mark the corresponding position marking line D of the front end cover (8) at the connection between the right expansion sleeve (3) and the front end cover (8). Mark the corresponding position marking line E of the front end cover (8) at the connection between the front outer cover (9) and the front end cover (8); Step C: After vertically lifting the assembled rotor (7) and placing it with the front end down on the vertical support table (10), hoist the dynamic balance dummy shaft (1) directly above the rotor (7). After aligning the center of the rotor (7), slowly lower it until the front tapered surface (13) and the rear tapered surface (12) of the dynamic balance dummy shaft (1) are respectively in contact with the right expansion sleeve (3) and the left expansion sleeve (2). Mark the marking line F at the connection between the rear tapered surface (12) of the dynamic balance dummy shaft (1) and the left expansion sleeve (2), and mark the marking line G at the connection between the front tapered surface (13) of the dynamic balance dummy shaft (1) and the right expansion sleeve (3). Install the locking nut (4) on the corresponding thread (14) at the front end of the dynamic balance dummy shaft (1) and complete the tightening. Mark the anti-loosening marking line at the connection between the dynamic balance dummy shaft (1) and the locking nut (4); Step D: After disassembling the dynamic balance dummy shaft (1), front end outer cover (9), locking nut (4) and right expansion sleeve (3) assembled on the rotor (7), reinstall the right expansion sleeve (3) onto the front end taper surface (13) of the dynamic balance dummy shaft (1) according to the marking line G, tighten the locking nut (4) back in place according to the anti-loosening marking line, hoist the assembled whole of the dynamic balance dummy shaft (1), right expansion sleeve (3) and locking nut (4) onto the automatic weight removal dynamic balancing machine, set the parameters S of the dynamic balancing machine, start the automatic weight removal dynamic balancing machine to complete the dynamic balance test of the whole dynamic balance dummy shaft and record the final unbalance on both sides. 、 ； Step E: Remove the locking nut (4) and the right expansion sleeve (3) on the dynamic balance dummy shaft (1). After disassembly, reassemble the right expansion sleeve (3), the dynamic balance dummy shaft (1), and the front outer cover (9) removed in Step D onto the rotor (7) respectively according to the marking lines D, E, F, and G. Subsequently, install the locking nut (4) tightly according to the anti-loosening marking line. Hoist the assembled rotor (7) as a whole onto the automatic weight removal dynamic balancing machine, set the parameter Q of the dynamic balancing machine, start the automatic weight removal dynamic balancing machine to complete the rotor weight removal dynamic balance test, and record the final unbalance on both sides. 、 ； Step F: Hoist the entire rotor (7) onto the vertical support table (10). After removing the locking nut (4), the dynamic balance dummy shaft (1), the left expansion sleeve (2) and the right expansion sleeve (3), turn the rotor (7) over and place it horizontally, and remove the front outer cover (9), the rear outer cover (5), the front end cover (8) and the rear end cover (6).

2. A dynamic balance test method for the outer rotor of a permanent magnet direct drive motor according to claim 1, characterized in that: In step C, the dynamic balance dummy shaft (1) is hoisted through the process screw hole (11) provided at the rear end.

3. A dynamic balance test method for the outer rotor of a permanent magnet direct drive motor according to claim 1, characterized in that: The dynamic balancing machine parameter S in step D includes the distance a from the support point of the dynamic balancing machine roller to the weight removal point on the rear false shaft, the distance b from the weight removal point on the rear false shaft to the weight removal point on the front false shaft, the distance c from the weight removal point on the front false shaft to the support point of the dynamic balancing machine roller, the working radius at the weight removal point on the front false shaft and the working radius at the weight removal point on the rear false shaft The rotational speed of the dynamic balancing machine is set according to the rated rotational speed N of the motor, and the maximum allowable unbalance is set according to the calculated value required by national standard G1.0 , set. According to the dynamic balance calculation of a rigid rotor, ， ， and the unbalance calculation formula, ， wherein, Indicates the allowable unbalance per unit mass of the rotor ( ）， represents the working angular velocity of the rotor, , where is the rotor speed, Indicates the balance grade, which is divided into 11 balance grades in total. Indicates the allowable unbalance of the rotor. Indicates the rotor mass, Indicates the allowable residual unbalance for each correction plane. represents the working radius, obtained, ， 。 4. A dynamic balance test method for the outer rotor of a permanent magnet direct drive motor according to claim 3, characterized in that: In .

5. A dynamic balance test method for the outer rotor of a permanent magnet direct drive motor according to claim 1, characterized in that: The dynamic balancing machine parameters Q in step E include the distance A from the support point of the dynamic balancing machine roller to the rear weight removal boss, the distance B from the rear weight removal boss to the front weight removal boss, the distance C from the front weight removal boss to the support point of the dynamic balancing machine roller, the working radius of the front weight removal boss and the working radius of the rear weight removal boss The rotational speed of the dynamic balancing machine is set according to the rated rotational speed N of the motor, and the maximum allowable unbalance is set according to the calculated value required by the national standard G2.5 , set. According to the dynamic balance calculation of a rigid rotor, ， ， and the unbalance calculation formula, ， In the formula, Indicates the allowable unbalance per unit mass of the rotor ( ）， represents the working angular velocity of the rotor, , where is the rotor speed, Indicates the balance level, which is divided into 11 balance levels in total. Indicates the allowable unbalance of the rotor. Denotes the rotor mass, Indicates the allowable residual unbalance for each correction plane. represents the working radius, obtained, ， 。 6. A dynamic balance test method for the outer rotor of a permanent magnet direct drive motor according to claim 5, characterized in that: among 。 7. A dynamic balance test method for the outer rotor of a permanent magnet direct drive motor according to claim 1, characterized in that: After completing the rotor weight removal dynamic balance test in step E, uniformly number the surfaces of the rotor (7) and the connections of each component.

8. [Corrected according to Rule 91 on 06.12.2023]

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