阅读说明：本技术 一种永磁变桨电机带制动器的电机转子动平衡校准方法 (Dynamic balance calibration method for motor rotor with brake of permanent magnet variable pitch motor ) 是由 王亚威 赵志明 高志伟 江安乐 史勇 于 2021-07-23 设计创作，主要内容包括：一种永磁变桨电机带制动器的电机转子动平衡校准方法如下：第一.事先制作填平键以及动平衡校准键；第二.永磁变桨电机带制动器的电机转子动平衡校准步骤如下：步骤一.将电机转子的第一键槽装配第一填平键,第二键槽装配动平衡校准键；步骤二.对步骤一得到的电机转子根据转子初始重心偏移量,做静平衡校准；步骤三.对步骤二得到的电机转子做动平衡校准；步骤四.将步骤三得到的电机转子中的动平衡校准键替换成标准平键,再安装上制动器法兰以及制动器转子,并取下第一填平键,最后获得动平衡校准后带制动器的电机转子。本发明能够有效规避由于安装了制动器而带来的二次不平衡影响。(A dynamic balance calibration method for a motor rotor with a brake of a permanent magnet variable pitch motor comprises the following steps: firstly, a leveling key and a dynamic balance calibration key are manufactured in advance; secondly, the dynamic balance calibration step of the motor rotor with the brake of the permanent magnet variable pitch motor is as follows: assembling a first leveling key on a first key groove of a motor rotor, and assembling a dynamic balance calibration key on a second key groove; step two, performing static balance calibration on the motor rotor obtained in the step one according to the initial gravity center offset of the rotor; step three, performing dynamic balance calibration on the motor rotor obtained in the step two; and step four, replacing the dynamic balance calibration key in the motor rotor obtained in the step three with a standard flat key, then installing a brake flange and the brake rotor, and taking down the first flat key to finally obtain the motor rotor with the brake after dynamic balance calibration. The invention can effectively avoid the secondary unbalance influence caused by the installation of the brake.)

1. A dynamic balance calibration method for a motor rotor with a brake of a permanent magnet variable pitch motor,

the permanent magnet variable pitch motor comprises a motor rotor (1) and a brake; two ends of the motor rotor (1) are respectively provided with a rotor front end plate (13) and a rotor rear end plate (14) which can be used for removing weight during dynamic balance calibration; the motor rotor (1) is provided with a shaft extension end and a non-shaft extension end, the brake is positioned and installed at the non-shaft extension end, the shaft extension end is provided with a first key groove (11), the non-shaft extension end is provided with a second key groove (12), and the non-shaft extension end is provided with a shaft shoulder (15); the brake is matched and assembled on the motor rotor (1) through a standard flat key (4) and the second key groove (12); the brake comprises a brake flange (2) and a brake rotor (3), a mounting groove (21) is formed in the brake flange (2), the brake flange (2) is matched with the standard flat key (4) through the mounting groove (21), and the standard flat key (4) is matched with the second key groove (12) and assembled on the non-shaft-extending end of the motor rotor (1);

the method is characterized in that: the dynamic balance calibration method of the motor rotor with the brake of the permanent magnet variable pitch motor comprises the following steps:

firstly, a leveling key and a dynamic balance calibration key (7) are manufactured in advance for use in dynamic balance calibration;

the leveling key is divided into a first leveling key (5) and a second leveling key (6);

the first leveling key (5) is used for matching the missing mass and the missing shape of the first key groove (11), the mass of the first leveling key (5) is the missing mass of the shaft extension end in the first key groove (11), so that when the first leveling key (5) is installed in the first key groove (11), the first key groove (11) is leveled and the mass of the shaft extension end is uniformly distributed;

the second leveling key (6) is used for matching the missing mass and the missing shape of the second key groove (12), the mass of the first leveling key (5) is the missing mass of the non-shaft extension end in the second key groove (12), so that when the second leveling key (6) is installed in the second key groove (12), the second key groove (12) is leveled and the mass of the non-shaft extension end is uniformly distributed;

the dynamic balance calibration key (7) is composed of a first key body (71) and a second key body (72), the first key body (71) is used for matching the missing mass and the missing shape of the second key groove (12), and the second key body (72) is used for matching the missing shape of the mounting groove (21) of the brake flange (2);

the calculation process of the mass of the dynamic balance calibration key (7) is as follows:

assembling the first key groove (11) of the motor rotor (1) with the first leveling key (5), assembling the second key groove (12) with the second leveling key (6), and then calculating the total mass of the motor rotor (1) and the gravity center offset of the motor rotor (1) after the first leveling key (5) and the second leveling key (6) are assembled by using three-dimensional software with functions of automatically calculating the product mass and the product gravity center offset, or obtaining the total mass of the motor rotor (1) and the gravity center offset of the motor rotor (1) after the first leveling key (5) and the second leveling key (6) are assembled by adopting a manual calculation mode;

punching and removing the weight of the rotor front end plate (13) and the rotor rear end plate (14) until the gravity center of the motor rotor (1) is coincided with the rotation axis of the motor rotor (1);

replacing the second leveling key (6) with the standard leveling key (4), assembling the brake rotor (3) on the motor rotor (1) through the brake flange (2) and the standard leveling key (4), calculating the total mass of the motor rotor (1) with the brake by using the three-dimensional software with the functions of automatically calculating the product mass and the product gravity center offset, or obtaining the total mass of the motor rotor (1) with the brake by adopting a manual calculation mode;

calculating the gravity center offset of the motor rotor (1) with the brake by using the three-dimensional software with the functions of automatically calculating the product quality and automatically calculating the gravity center offset of the product;

substituting the gravity center offset of the permanent magnet variable pitch motor, the total mass of the permanent magnet variable pitch motor and the radius of a brake flange (2) into an unbalance formula to obtain the unbalance;

the unbalance formula is as follows:

wherein M is the unbalance, M is the total mass of the permanent magnet variable pitch motor, x and y are the offset of the gravity center on the x axis and the y axis respectively, and R is the radius of the installation shaft hole of the brake flange (2);

the unbalance amount is compensated to the second leveling key (6), and the quality of the dynamic balance calibration key (7) is obtained;

secondly, the dynamic balance calibration step of the motor rotor with the brake of the permanent magnet variable pitch motor is as follows:

firstly, assembling a first key groove (11) of the motor rotor (1) with the first leveling key (5), and assembling a second key groove (12) with the dynamic balance calibration key (7);

performing static balance calibration on the motor rotor (1) obtained in the step one according to the initial gravity center offset of the rotor, specifically, cutting off the weight on one side of the shaft shoulder (15) along the opening direction of the second key groove (12) until the gravity center of the motor rotor (1) is coincided with the axis of the motor rotor (1), so that the motor rotor (1) is in a static balance state;

step three, performing dynamic balance calibration on the motor rotor (1) obtained in the step two, specifically, punching and removing the weight of the rotor front end plate (13) and the rotor rear end plate (14) until the gravity center of the motor rotor (1) coincides with the rotation axis of the motor rotor (1) in the dynamic balance calibration;

and step four, replacing the dynamic balance calibration key (7) in the motor rotor (1) obtained in the step three with the standard flat key (4), installing the brake flange (2) and the brake rotor (3), removing the first leveling key (5), and finally obtaining the motor rotor (1) with the brake after dynamic balance calibration.

2. The method for calibrating the dynamic balance of the motor rotor with the brake of the permanent magnet pitch-variable motor according to claim 1, is characterized in that: and the calculation of the mass of the dynamic balance calibration key (7) adopts three-dimensional software simulation calculation.

3. The method for calibrating the dynamic balance of the motor rotor with the brake of the permanent magnet pitch-variable motor according to claim 1, is characterized in that: the first leveling key (5) and the second leveling key (6) are semicircular keys.

4. The method for calibrating the dynamic balance of the motor rotor with the brake of the permanent magnet pitch-variable motor according to claim 1, is characterized in that: the second leveling key (6) is made of steel, and the brake flange (2) is made of aluminum alloy.

Technical Field

The invention relates to the technical field of dynamic balance of a permanent magnet pitch-variable motor, in particular to a dynamic balance calibration method for a motor rotor with a brake of the permanent magnet pitch-variable motor.

Background

In the rotating process of the motor rotor, centrifugal force is generated due to the fact that the gravity center deviates from the axis, the centrifugal force is larger when the motor rotates at a higher speed, vibration is generated in the rotating process of the motor rotor, and the service life of a bearing is influenced. It is therefore necessary to calibrate the rotor of the machine so that its centre of gravity lies on the axis.

An electromagnetic brake is arranged in the variable pitch motor, and a general dynamic balance calibration method is to install semicircular flat keys at a shaft extension end and a non-shaft extension end and then perform de-weight calibration on front and rear end plates of a motor rotor. In actual operation, the brake rotor and the motor rotor are fixedly installed through a common flat key and rotate together. Therefore, it is not sufficient to dynamically balance the motor rotor alone, and a new unbalance amount is generated after the brake rotor is installed. Another method for calibrating dynamic balance is to use balance mud to perform weighted dynamic balance on the front and rear end plates of the rotor after the rotor of the brake is installed. After the brake rotor is installed, the brake flange is close to the rear end plate of the rotor, no drill bit drilling space exists, and the weight removing operation cannot be carried out. When using balanced mud to aggravate, long-time balanced mud can age gradually, including the inside vibration of fan etc. balanced mud can face the risk that drops. In actual production, the motor is burnt out due to the falling of the balance mud, and more companies give up the process of using the balance mud.

Only the dynamic balance of the motor rotor is calibrated, and the unbalance amount of the rotor of the installed brake can generate difference, so that the unbalance accuracy of the motor rotor is reduced. And the drilling and the weight removal can not be carried out due to interference after the brake rotor is installed. For the permanent magnet variable pitch motor rotor, a novel counterweight-removing dynamic balance scheme is needed.

Therefore, how to solve the above-mentioned deficiencies of the prior art is a problem to be solved by the present invention.

Disclosure of Invention

The invention aims to provide a dynamic balance calibration method for a motor rotor with a brake of a permanent magnet variable pitch motor.

In order to achieve the purpose, the invention adopts the technical scheme that:

a dynamic balance calibration method for a motor rotor with a brake of a permanent magnet variable pitch motor,

the permanent magnet variable pitch motor comprises a motor rotor and a brake; the two ends of the motor rotor are respectively provided with a rotor front end plate and a rotor rear end plate which can be used for removing weight during dynamic balance calibration; the motor rotor is provided with a shaft extension end and a non-shaft extension end, the brake is positioned and installed at the non-shaft extension end, the shaft extension end is provided with a first key groove, the non-shaft extension end is provided with a second key groove, and the non-shaft extension end is provided with a shaft shoulder; the brake is matched and assembled on the motor rotor through a standard flat key and the second key groove; the brake comprises a brake flange and a brake rotor, wherein the brake flange is provided with a mounting groove, the brake flange is matched with the standard flat key through the mounting groove, and the standard flat key is matched with the second key groove and assembled on the non-shaft-extending end of the motor rotor;

the dynamic balance calibration method of the motor rotor with the brake of the permanent magnet variable pitch motor comprises the following steps:

firstly, a leveling key and a dynamic balance calibration key are manufactured in advance for use in dynamic balance calibration;

the leveling key is divided into a first leveling key and a second leveling key;

the first leveling key is used for matching the missing mass and the missing shape of the first key groove, and the mass of the first leveling key is the missing mass of the shaft extension end in the first key groove, so that when the first leveling key is installed in the first key groove, the first key groove is leveled and the mass of the shaft extension end is uniformly distributed;

the second leveling key is used for matching the missing mass and the missing shape of the second key groove, and the mass of the first leveling key is the missing mass of the non-shaft-extension end in the second key groove, so that when the second leveling key is installed in the second key groove, the second key groove is leveled and the mass of the non-shaft-extension end is uniformly distributed;

the dynamic balance calibration key is composed of a first key body and a second key body, the first key body is used for matching the missing mass and the missing shape of the second key groove, and the second key body is used for matching the missing shape of the mounting groove of the brake flange;

the calculation process of the mass of the dynamic balance calibration key is as follows:

assembling the first key groove of the motor rotor with the first leveling key, assembling the second key groove with the second leveling key, calculating the total mass of the motor rotor through mass accumulation, and then calculating the total mass of the motor rotor and the gravity center offset of the motor rotor after assembling the first leveling key and the second leveling key by using three-dimensional software with functions of automatically calculating the product mass and the product gravity center offset, or obtaining the total mass of the motor rotor and the gravity center offset of the motor rotor after assembling the first leveling key and the second leveling key by adopting a manual calculation mode;

punching and removing the weight of the front end plate and the rear end plate of the rotor until the gravity center of the motor rotor is coincided with the rotation axis of the motor rotor;

replacing the second leveling key with the standard leveling key, assembling the brake rotor on the motor rotor through the brake flange and the standard leveling key, and calculating the total mass of the motor rotor with the brake by using the three-dimensional software with the functions of automatically calculating the product quality and the product gravity center offset, or obtaining the total mass of the motor rotor with the brake by adopting a manual calculation mode;

calculating the gravity center offset of the motor rotor with the brake by using the three-dimensional software with the functions of automatically calculating the product quality and automatically calculating the gravity center offset of the product, or obtaining the gravity center offset of the motor rotor with the brake by adopting a manual calculation mode;

substituting the gravity center offset of the permanent magnet variable pitch motor, the total mass of the permanent magnet variable pitch motor and the radius of a brake flange into an unbalance formula to obtain the unbalance;

the unbalance formula is as follows:

the method comprises the following steps that M is an unbalance amount, M is the total mass of the permanent magnet variable pitch motor, x and y are offsets of a gravity center on an x axis and a y axis respectively, and R is the radius of a flange mounting shaft hole of a brake;

compensating the unbalance amount to the second leveling key to obtain the quality of the dynamic balance calibration key;

secondly, the dynamic balance calibration step of the permanent magnet variable pitch motor is as follows:

assembling a first key groove of the motor rotor with the first leveling key, and assembling the second key groove with the dynamic balance calibration key;

performing static balance calibration on the motor rotor obtained in the step one according to the initial gravity center offset of the rotor, specifically, cutting off and removing the weight on one side of the shaft shoulder along the opening direction of the second key groove until the gravity center of the motor rotor is coincided with the axis of the motor rotor so as to enable the motor rotor to be in a static balance state;

performing dynamic balance calibration on the motor rotor obtained in the step two, specifically, punching and removing the weight of the front end plate and the rear end plate of the rotor until the gravity center of the motor rotor coincides with the rotation axis of the motor rotor in the dynamic balance calibration;

and step four, replacing the dynamic balance calibration key in the motor rotor obtained in the step three with the standard flat key, then installing the brake flange and the brake rotor, and taking down the first flat key to finally obtain the motor rotor with the brake after dynamic balance calibration.

The relevant content in the above technical solution is explained as follows:

1. in the above scheme, in the second step of the calculation process of the mass of the dynamic balance calibration key, the motor rotor is subjected to dynamic balance calibration by punching and de-weighting the rotor front end plate and the rotor rear end plate, so that the electronic rotor is in a dynamic balance state before the brake is installed.

2. In the above scheme, the first key groove is leveled by the first leveling key, and the second key groove is leveled by the dynamic balance calibration key and includes the compensation amount of the unbalance amount, so that the dynamic balance calibration of the motor rotor with the brake can be completed without installing a brake flange.

3. In the above scheme, the second body of the dynamic balance calibration key is higher than the second key groove, so that the motor rotor is statically unbalanced, and the number of holes drilled during the later dynamic balance calibration is increased, and therefore static balance calibration can be completed on the motor rotor provided with the dynamic balance calibration key through the second step.

4. In the above scheme, the calculation of the mass of the dynamic balance calibration key adopts three-dimensional software simulation calculation, and the three-dimensional software can be three-dimensional software with an automatic calculation function, such as CAD, pro or Solidworks. In other embodiments, the calculation of the mass of the dynamic balance calibration key may also be obtained by manual operation, and this is not limited in this embodiment.

5. In the above solution, the first leveling key and the second leveling key are semicircular keys.

6. In the above scheme, the second leveling key is made of steel, and the brake flange is made of aluminum alloy.

The working principle and the advantages of the invention are as follows:

1. according to the invention, the secondary unbalance caused by assembling the brake flange and the brake rotor is calculated in advance, and the dynamic balance calibration key is controlled according to the unbalance, so that the secondary unbalance influence caused by installing the brake flange and the brake rotor can be effectively avoided;

2. according to the invention, the motor rotor reaches a static balance state by cutting off and removing the weight at one side of the opening direction of the second key groove of the shaft shoulder, so that the initial unbalance can be greatly reduced, and the number of drilled holes is less than 2.

Drawings

FIG. 1 is a flow chart of an embodiment of the present invention;

FIG. 2 is a flow chart of calculating the mass of a dynamic balance calibration key in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a motor rotor according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a motor rotor after a leveling key is assembled according to an embodiment of the invention;

FIG. 5 is a schematic view of the motor rotor assembled with the brake according to the embodiment of the present invention;

FIG. 6 is a partial cross-sectional view of FIG. 5;

FIG. 7 is a schematic structural diagram of the assembled motor rotor in step two of the embodiment of the present invention;

FIG. 8 is a perspective view of the assembled motor rotor in step two according to the embodiment of the present invention;

FIG. 9 is a schematic view of a dynamic structure of a permanent magnet pitch motor after dynamic balance calibration according to an embodiment of the invention;

FIG. 10 is a schematic structural view of a brake flange according to an embodiment of the present invention;

FIG. 11 is a schematic structural view of a brake rotor according to an embodiment of the present invention;

FIG. 12 is an exploded view of a second flat key and a second keyway in accordance with an embodiment of the present invention;

FIG. 13 is an exploded view of a dynamic balance calibration key and second keyway and mounting groove in accordance with an embodiment of the present invention;

FIG. 14 is an exploded view of a standard flat key and second keyway and mounting slot according to an embodiment of the present invention.

In the above drawings: 1. a motor rotor; 2. a brake flange; 3. a brake rotor; 4. a standard flat key; 5. a first leveling key; 6. a second leveling key; 7. a dynamic balance calibration key; 11. a first keyway; 12. a second keyway; 13. a rotor front end plate; 14. a rotor rear end plate; 15. a shaft shoulder; 21. mounting grooves; 71. a first key body; 72. a second key body.

Detailed Description

The invention is further described with reference to the following figures and examples:

example (b): the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure may be shown and described, and which, when modified and varied by the techniques taught herein, can be made by those skilled in the art without departing from the spirit and scope of the disclosure.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms "a", "an", "the" and "the", as used herein, also include the plural forms.

The terms "first," "second," and the like, as used herein, do not denote any order or importance, nor do they denote any order or importance, but rather are used to distinguish one element from another element or operation described in such technical terms.

As used herein, "connected" or "positioned" refers to two or more elements or devices being in direct physical contact with each other or in indirect physical contact with each other, and may also refer to two or more elements or devices being in operation or acting on each other.

As used herein, the terms "comprising," "including," "having," and the like are open-ended terms that mean including, but not limited to.

As used herein, the term (terms), unless otherwise indicated, shall generally have the ordinary meaning as commonly understood by one of ordinary skill in the art, in this written description and in the claims. Certain words used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the disclosure.

The terms "front", "rear", "upper", "lower", "left" and "right" used herein are directional terms, and are used only for describing the positional relationship between the structures, and are not intended to limit the protection schemes and the actual directions of the embodiments.

Referring to the attached drawings 1-14, a dynamic balance calibration method for a motor rotor with a brake of a permanent magnet pitch-variable motor is disclosed, wherein the permanent magnet pitch-variable motor comprises a motor rotor 1 and a brake; the two ends of the motor rotor 1 are respectively provided with a rotor front end plate 13 and a rotor rear end plate 14 which can be used for removing weight during dynamic balance calibration. The motor rotor 1 is provided with a shaft extension end and a non-shaft extension end, the brake is fixedly installed at the non-shaft extension end, the shaft extension end is provided with a first key groove 11, the non-shaft extension end is provided with a second key groove 12, and the non-shaft extension end is provided with a shaft shoulder 15. The brake is matched and assembled on the motor rotor 1 through a standard flat key 4 and the second key groove 12. The stopper includes stopper flange 2 and stopper rotor 3, mounting groove 21 has been seted up on the stopper flange 2, stopper flange 2 passes through mounting groove 21 with the cooperation of standard flat key 4, standard flat key 4 with second keyway 12 cooperate the assembly in on the non-axle extension end of electric motor rotor 1.

The dynamic balance calibration method of the motor rotor with the brake of the permanent magnet variable pitch motor comprises the following steps:

firstly, a leveling key and a dynamic balance calibration key 7 are manufactured in advance for use in dynamic balance calibration.

The flat keys are divided into a first flat key 5 and a second flat key 6. The first leveling key 5 and the second leveling key 6 are semicircular keys. The second leveling key 6 is made of steel, and the brake flange 2 is made of aluminum alloy.

The first leveling key 5 is used for matching the missing mass and the missing shape of the first key groove 11, and the mass of the first leveling key 5 is the missing mass of the shaft extension end in the first key groove 11, so that when the first leveling key 5 is installed in the first key groove 11, the first key groove 11 is leveled and the mass of the shaft extension end is uniformly distributed.

The second leveling key 6 is used for matching the missing mass and the missing shape of the second key groove 12, and the mass of the first leveling key 5 is the missing mass of the non-shaft-extension end in the second key groove 12, so that when the second leveling key 6 is installed in the second key groove 12, the second key groove 12 is leveled and the mass of the non-shaft-extension end is uniformly distributed.

Referring to fig. 13, the dynamic balance calibration key 7 is composed of a first key body 71 and a second key body 72, the first key body 71 is used for matching the missing mass and the missing shape of the second key groove 12, and the second key body 72 is used for matching the missing shape of the mounting groove 21 of the brake flange 2.

The calculation process of the mass of the dynamic balance calibration key 7 is as follows:

referring to fig. 4, the first key groove 11 of the motor rotor 1 is assembled with the first leveling key 5, the second key groove 12 is assembled with the second leveling key 6, the total mass of the motor rotor 1 is calculated through mass accumulation, then the total mass of the motor rotor 1 and the gravity center offset of the motor rotor 1 after the first leveling key 5 and the second leveling key 6 are assembled are calculated by using three-dimensional software with functions of automatically calculating the product mass and the product gravity center offset, or the total mass of the motor rotor 1 and the gravity center offset of the motor rotor 1 after the first leveling key 5 and the second leveling key 6 are assembled are obtained by adopting a manual calculation mode, and the gravity center offset of the motor rotor 1 after the first leveling key 5 and the second leveling key 6 are assembled is the offset of the gravity center of the motor rotor 1 on the X axis and the Y axis.

The total mass of the motor rotor 1 and the calculation method of the gravity center offset of the motor rotor 1 after the first leveling key 5 and the second leveling key 6 are assembled are both in the prior art, which is not the innovation point of the present application, and are not described herein again.

And secondly, punching and removing the weight of the front rotor end plate 13 and the rear rotor end plate 14 until the gravity center of the motor rotor 1 coincides with the rotation axis of the motor rotor 1. The motor rotor 1 is thus calibrated for dynamic balance so that the electronic rotor 1 is in dynamic balance before the brake is installed.

And thirdly, as shown in fig. 5, replacing the second leveling key 6 with the standard leveling key 4, assembling the brake rotor 3 on the motor rotor 1 through the brake flange 2 and the standard leveling key 4, and calculating the total mass of the motor rotor 1 with the brake by using the three-dimensional software with the functions of automatically calculating the product mass and the product gravity center offset, or obtaining the total mass of the motor rotor 1 with the brake by adopting a manual calculation mode.

And fourthly, calculating the gravity center offset of the motor rotor 1 with the brake by using the three-dimensional software with the functions of automatically calculating the product quality and automatically calculating the gravity center offset of the product, or obtaining the gravity center offset of the motor rotor 1 with the brake by adopting a manual calculation mode. The method for obtaining the gravity center offset of the motor rotor 1 with the brake is the prior art, is not an innovation point of the present application, and is not described herein.

Substituting the gravity center offset of the permanent magnet variable pitch motor, the total mass of the permanent magnet variable pitch motor and the radius of the brake flange 2 into an unbalance formula to obtain the unbalance;

the unbalance formula is as follows:

wherein M is the unbalance amount, M is the total mass of the permanent magnet pitch-variable motor, x and y are the offset of the gravity center on the x axis and the y axis respectively, and R is the radius of the installation shaft hole of the brake flange 2.

The unbalance amount may be calculated by using three-dimensional software having an automatic unbalance amount calculation function or may be calculated manually, which is not limited in this embodiment.

And sixthly, compensating the unbalance amount to the second leveling key 6 to obtain the quality of the dynamic balance calibration key 7. Therefore, the first key body 71 of the dynamic balance calibration key 7 has the same shape and mass as the second leveling key 6, and the mass of the second key body 72 is an unbalance amount.

In this embodiment, the calculation process of the mass of the dynamic balance calibration key 7 is simulated and calculated by using three-dimensional software, and the three-dimensional software may be three-dimensional software with an automatic calculation function, such as CAD, pro, Solidworks, or the like. In other embodiments, the calculation of the mass of the dynamic balance calibration key 7 may also be obtained by manual operation, which is not limited in this embodiment.

Secondly, the dynamic balance calibration step of the motor rotor with the brake of the permanent magnet variable pitch motor is as follows:

firstly, the first key groove 11 of the motor rotor 1 is assembled with the first leveling key 5, and the second key groove 12 is assembled with the dynamic balance calibration key 7.

The first leveling key 5 levels the first key groove 11, and the dynamic balance calibration key 7 enables the second key groove 12 to be leveled and includes compensation amount of unbalance amount, so that dynamic balance calibration of the motor rotor 1 with the brake can be completed without installing a brake flange.

And step two, for the motor rotor obtained in the step one, according to the initial rotor gravity center offset, and according to the initial rotor gravity center offset, 1, performing static balance calibration on the motor rotor obtained in the step one, specifically, cutting off and removing the weight on one side of the shaft shoulder 15 along the opening direction of the second key groove 12 until the gravity center of the motor rotor 1 coincides with the axis of the motor rotor 1, so that the motor rotor 1 is in a static balance state.

Because the second key body 72 of the dynamic balance calibration key 7 is higher than the second key groove 12, the motor rotor 1 is statically unbalanced, and the number of holes drilled during the later dynamic balance calibration is increased, so that the motor rotor 1 can reach a static balance state through the second step, the initial unbalance amount can be greatly reduced, and the number of drilled holes is less than 2.

And step three, performing dynamic balance calibration on the motor rotor 1 obtained in the step two, specifically, punching and removing the weight of the rotor front end plate 13 and the rotor rear end plate 14 until the gravity center of the motor rotor 1 coincides with the rotation axis of the motor rotor 1 in the dynamic balance calibration.

And step four, replacing the dynamic balance calibration key 7 in the motor rotor 1 obtained in the step three with the standard flat key 4, then installing the brake flange 2 and the brake rotor 3, removing the first flat filling key 5, and finally obtaining the motor rotor 1 with the brake after dynamic balance calibration.

In summary, compared with the prior art, the invention has the following advantages:

1. according to the invention, the secondary unbalance caused by assembling the brake flange and the brake rotor is calculated in advance, and the dynamic balance calibration key is controlled according to the unbalance, so that the secondary unbalance influence caused by installing the brake flange and the brake rotor can be effectively avoided;

2. according to the invention, the motor rotor reaches a static balance state by cutting off and removing the weight at one side of the opening direction of the second key groove of the shaft shoulder, so that the initial unbalance can be greatly reduced, and the number of drilled holes is less than 2.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.