WO2025112079A1 - Dynamic balancing test method for outer rotor of permanent magnet direct drive motor - Google Patents

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

The 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

At present, the rotor of conventional permanent magnet direct-drive motor is an inner rotor structure, and the dynamic balancing of the rotor is carried out by adding a weight method with a balancing block to ensure that the imbalance of the rotor meets the design requirements after dynamic balancing. 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 this new structure of motor rotor to complete the dynamic balancing test reliably, safely and efficiently is a problem that must be solved in motor manufacturing technology.

Based on this, the applicant proposed a permanent magnet direct drive motor outer rotor dynamic balancing test method to solve the above technical problems.

Summary of the invention

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

The present invention is solved by the following technical solutions:

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

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;

Step B: Install the left expansion sleeve and the right expansion sleeve on the rear end cover and the front end cover respectively, install the front outer cover on the front end cover and tighten the bolts, and mark B at the same time;

Step C: Lift the assembled rotor vertically and place it on a vertical support table with the front end facing downwards. Lift the dynamic balancing dummy shaft to the top of the rotor, align it with the center of the rotor and slowly drop it until the front and rear conical surfaces of the dynamic balancing dummy shaft abut against the right expansion sleeve and the left expansion sleeve respectively. Install the locking nut on the corresponding thread at the front end of the dynamic balancing dummy shaft and tighten it. At the same time, mark C.

Step D: After disassembling the dummy shaft, front end outer cover, locking nut and right expansion sleeve assembled on the rotor, reinstall the right expansion sleeve on the front end conical surface of the dummy shaft according to mark C, and re-tighten the locking nut in place according to mark C. Hoist the reassembled dummy shaft, right expansion sleeve and locking nut 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 overall dynamic balancing test of the dummy shaft and record the final imbalance on both sides. , ;

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 and install the locking nut according to mark C. Lift 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. , ;

Step F: hoist 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.

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.

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.

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 and corresponding 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 and corresponding to the position of the front end cover, and also includes an identification line E marked at the connection between the front outer cover and the front end cover and corresponding to the position of the front end cover.

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

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.

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.

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 dummy shaft weight removal 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,

According to the rigid rotor dynamic balance calculation,

,

,

And the unbalance calculation formula,

,

In the formula, 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 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,

get,

,

.

Preferably, middle, .

Preferably, the dynamic balancing machine parameter Q in step E includes 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,

According to the rigid rotor dynamic balance calculation,

,

,

And the unbalance calculation formula,

,

In the formula, 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 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,

get,

,

.

Preferably, middle, .

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.

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.

Preferably, the roughness of the front end conical surface and the rear end conical surface is no more than 1.6 microns.

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 not less than 85%.

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.

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

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.

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.

The beneficial effects of the present invention are: realizing dynamic balancing verification of an outer rotor without a rotating shaft structure and without balancing block mounting grooves or mounting screw holes at both ends; the device has a simple and reliable structure, strong practicality, convenient operation and maintenance, low cost, and is easy to disassemble and assemble, and is suitable for small-batch manufacturing of new outer rotors.

BRIEF DESCRIPTION OF THE DRAWINGS

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 creative work.

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.

FIG. 2 is a reference diagram of overall dynamic balancing parameters of the rotor of the permanent magnet direct drive motor outer rotor dynamic balancing test fixture of the present invention.

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.

FIG. 4 is a schematic diagram of the structure of the permanent magnet direct drive motor outer rotor dynamic balancing test fixture of the present invention.

FIG. 5 is a reference diagram of test parameters of a tooling test for a permanent magnet direct drive motor outer rotor dynamic balancing test according to the present invention.

FIG. 6 is a cross-sectional view of the dynamic balancing dummy shaft structure of the present invention.

FIG. 7 is a schematic structural diagram of the locking nut of the present invention.

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

FIG. 9 is a schematic diagram of the left expansion sleeve of the present invention.

Fig. 10 is a schematic diagram of a rotational cross-section taken along the line A-A in Fig. 9 .

Fig. 11 is a schematic cross-sectional view of the B-B section of Fig. 10 .

FIG. 12 is a schematic diagram of the right expansion sleeve of the present invention.

Fig. 13 is a schematic diagram of a rotational cross-section taken at C-C in Fig. 12 .

Fig. 14 is a schematic cross-sectional view of the D-D section of Fig. 13 .

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 cone, 13. front end cone, 14. thread.

Implementation

The following will clearly and completely describe the technical solutions of various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments described in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Example

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 pen to mark the position corresponding to the front end cover 8 at the connection between the rotor 7 and the front end cover 8, and mark the position corresponding to the rear end cover 6 at the connection between the rotor 7 and the rear end cover 6. Mark the line A, tighten the bolts, mark the number on each bolt head with a marker pen, and mark the same position on the front end cover 8 and the rear end cover 6 with a marker pen. 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 pen 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 outer cover 9 onto the front end cover 8 and tighten the bolts, and use a marker pen to mark the position identification line E corresponding to the front end cover 8 at the connection between the front end outer 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 downward 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 use a marker to 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 4. Mark the anti-loosening mark line at the connection of nut 4; Step D: After disassembling the dynamic balancing dummy shaft 1, the front end outer cover 9, the locking nut 4 and the 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 the mark C, and re-tighten the locking nut 4 in place according to the mark C, and hoist the reassembled dynamic balancing dummy shaft 1, the right expansion sleeve 3 and the 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 overall dynamic balancing test of the dynamic balancing dummy shaft 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 the mark B and mark C respectively, then tighten and install the locking nut 4 according to the 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 , use a marker to mark the surfaces of the rotor 7 and the joints of each component with a uniform number; 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 end outer cover 9, the rear end outer cover 5, the front end end cover 8 and the rear end cover 6.

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 dummy shaft weight removal 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,

According to the rigid rotor dynamic balance calculation,

,

,

And the unbalance calculation formula,

,

In the formula, 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,

get,

,in ,

,in .

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

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,

According to the rigid rotor dynamic balance calculation,

,

,

And the unbalance calculation formula,

,

In the formula, 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,

get,

,in ,

,in .

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

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 annular portion and a small head. The outer diameter of the large end annular portion is smaller than the inner diameter of the front end outer cover 9, and the inner diameter of the large end annular portion is greater than the minimum diameter of the tapered surface B. The small head is processed into a hexagonal nut shape.

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

In other embodiments, the rotor unweighting dynamic balancing test can be verified by welding the balancing block using the weight-adding method.

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 present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Type your sequence listing free description paragraph here.

Claims (8)

A method for dynamic balancing an outer rotor of a permanent magnet direct drive motor, characterized in that it comprises 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 position corresponding to the front end cover (8) at the connection between the rotor (7) and the front end cover (8) with an identification line A, and mark the position corresponding to the rear end cover (6) at the connection between the rotor (7) and the rear end cover (6) with an identification line B, mark the number on the head of each bolt, and mark the same number on the position corresponding to the bolt 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) onto the rear end cover (6) and the front end cover (8) respectively, install the front end outer cover (9) onto the front end cover (8) and tighten the bolts, 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), 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), and mark the position identification line E corresponding to the front end cover (8) at the connection between the front end outer cover (9) and the front end cover (8); Step C: After the assembled rotor (7) is lifted vertically, it is placed on a vertical support platform (10) with the front end facing downwards, and the dynamic balancing dummy shaft (1) is lifted to the top of the rotor (7), aligned with the center of the rotor (7), and then slowly dropped 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), and an identification line F is marked at the connection between the rear end conical surface (12) of the dynamic balancing dummy shaft (1) and the left expansion sleeve (2), and an identification line G is marked at the connection between the front end conical surface (13) of the dynamic balancing dummy shaft (1) and the right expansion sleeve (3), and the locking nut (4) is installed on the corresponding thread (14) at the front end of the dynamic balancing dummy shaft (1) and tightened, and an anti-loosening marking line is marked at the connection between the dynamic balancing dummy shaft (1) and the locking nut (4); Step D: After disassembling the dynamic balancing dummy shaft (1), the front end outer cover (9), the locking nut (4) and the 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 the marking line G, and re-tighten the locking nut (4) in place according to the anti-loosening marking line. Hoist the reassembled dynamic balancing dummy shaft (1), the right expansion sleeve (3) and the 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 the marking lines D, E, F and G respectively. Then tighten and install the locking nut (4) according to the anti-loosening marking lines. Lift 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. , ; 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 end outer cover (9), the rear end outer cover (5), the front end end cover (8) and the rear end cover (6). The method for dynamic balancing an outer rotor of a permanent magnet direct drive motor according to claim 1 is characterized in that: in step C, the dynamic balancing dummy shaft (1) is hoisted through the process screw hole (11) provided at the rear end. A method for dynamic balancing 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 a distance a from the roller support point of the dynamic balancing machine to the rear end dummy shaft deweighting part, b from the rear end dummy shaft deweighting part to the front end dummy shaft deweighting part, c from the front end dummy shaft deweighting part to the roller support point of the dynamic balancing machine, and a working radius of the front end dummy shaft deweighting part. And the working radius of the rear end dummy shaft weight removal 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, According to the rigid rotor dynamic balance calculation, , , And the unbalance calculation formula, , In the formula, 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 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, get, , . The method for dynamic balancing the outer rotor of a permanent magnet direct drive motor according to claim 3 is characterized in that: middle, . According to a method for dynamic balancing the outer rotor of a permanent magnet direct-drive motor according to claim 1, it is characterized in that: the dynamic balancing machine parameter Q in step E includes 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, According to the rigid rotor dynamic balance calculation, , , And the unbalance calculation formula, , In the formula, 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 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, get, , . The method for dynamic balancing the outer rotor of a permanent magnet direct drive motor according to claim 5 is characterized in that: middle, . A method for dynamic balancing the outer rotor of a permanent magnet direct drive motor according to claim 1, characterized in that: after the rotor weight removal dynamic balancing test is completed in step E, a uniform number is marked on the surface of the rotor (7) and the connection points of each component. [Corrected 06.12.2023 in accordance with Article 91]