CN108683306B - Press mounting method for motor rotor punching sheet - Google Patents

Press mounting method for motor rotor punching sheet Download PDF

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Publication number
CN108683306B
CN108683306B CN201810531986.3A CN201810531986A CN108683306B CN 108683306 B CN108683306 B CN 108683306B CN 201810531986 A CN201810531986 A CN 201810531986A CN 108683306 B CN108683306 B CN 108683306B
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China
Prior art keywords
rotor punching
punching sheet
pressure
rotor
maintaining
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CN201810531986.3A
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CN108683306A (en
Inventor
黄志强
杨振中
姚秋华
段宗玉
石江
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CRRC Zhuzhou Electric Co Ltd
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CRRC Zhuzhou Electric Co Ltd
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Priority to CN201810531986.3A priority Critical patent/CN108683306B/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K15/00Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies

Abstract

The invention discloses a press mounting method of a motor rotor punching sheet, which comprises the following steps: dividing the laminated rotor punching sheets into at least two groups of rotor punching sheet groups according to a preset principle, and heating each group of rotor punching sheet groups; sleeving the heated first group of rotor punching sheets into a rotating shaft, maintaining the pressure, and cooling to below a preset temperature; and continuously sleeving the next group of the heated rotor punching sheet group into the rotating shaft, maintaining the pressure, cooling to below a preset temperature, repeating the step until all the groups of the heated rotor punching sheet groups are sleeved into the rotating shaft, maintaining the pressure, and cooling to below the preset temperature. By applying the press-fitting method of the motor rotor punching sheet provided by the invention, pressure-maintaining cooling is carried out by certain pressure-maintaining force in each section of press-fitting process in a sectional press-fitting mode, so that no gap exists between the rotor core and the stop shaft shoulder of the rotating shaft after cooling, and the quality of the rotor core is ensured.

Description

Press mounting method for motor rotor punching sheet
Technical Field
The invention relates to the technical field of motors, in particular to a press-fitting method of motor rotor punching sheets.
Background
The motor rotor iron core is generally formed by laminating hundreds of silicon steel sheets and even thousands of silicon steel sheets, the length of the common medium-sized motor rotor iron core is generally 200-800 mm, according to the traditional process flow, after the rotor iron core is laminated, 4 pull rods are arranged on a laminating die, pull rod nuts are symmetrically screwed by a spanner, and a laminating die dummy shaft is withdrawn. The motor rotor is integrally heated to a certain temperature, and the whole rotor is sleeved on the rotating shaft in a hot mode.
The punching sheet of the motor rotor core and the rotating shaft are generally assembled through interference fit, the interference magnitude is determined by transmitted torque, motor rotating speed, temperature rise and other factors, part of the motor rotating shaft core is slender, namely the length of the core is long, and a matching shaft hole is small, when the motor is subjected to core hot sleeving in the prior art, the rotor core shrinks in the axial direction along with the temperature reduction of the rotor core, and a gap of 1-2 mm exists between the rotor core and a shaft stop shoulder, so that the rotor moves seriously in the axial direction in the motor operation process.
In summary, how to effectively solve the problems of serious axial movement of the rotor in the operation process of the motor and the like is a problem to be solved by those skilled in the art at present.
Disclosure of Invention
In view of the above, the present invention provides a press-fitting method for a rotor sheet of a motor, which can effectively solve the problem that a rotor moves seriously in an axial direction during the operation of the motor.
In order to achieve the purpose, the invention provides the following technical scheme:
a press-fitting method of a motor rotor punching sheet comprises the following steps:
dividing the laminated rotor punching sheets into at least two groups of rotor punching sheet groups according to a preset principle, and heating each group of rotor punching sheet groups;
sleeving the heated first group of rotor punching sheets into a rotating shaft, maintaining the pressure, and cooling to below a preset temperature;
and continuously sleeving the next group of the heated rotor punching sheet group into the rotating shaft, maintaining the pressure, cooling to below a preset temperature, repeating the step until all the groups of the heated rotor punching sheet groups are sleeved into the rotating shaft, maintaining the pressure, and cooling to below the preset temperature.
Preferably, in the press-fitting method for the motor rotor punching sheet, the preset temperature is 50 ℃.
Preferably, in the press-fitting method for the motor rotor punching sheet, the pressure maintaining specifically includes:
and (5) placing under an oil press for pressure maintaining.
Preferably, in the press-fitting method for the rotor punching sheet of the motor, the number of the rotor punching sheets included in each group of the rotor punching sheet groups is equal.
Preferably, in the press-fitting method for the rotor sheet of the motor, the preset principle specifically includes:
and ensuring that the pressure maintaining force of each group is greater than the pushing force after grouping, wherein the pressure maintaining force is the pressure for ensuring the pressure between the rotor punching sheets to perform pressure maintaining cooling, and the pushing force is the minimum pushing force caused by the interference magnitude of the rotor punching sheets.
Preferably, in the press-fitting method for the rotor sheets of the motor, the next set of the heated rotor sheets is sleeved on the rotating shaft, and the method specifically includes:
and continuously positioning the next group of the heated rotor punching sheet group adjacent to the previous group of the heated rotor punching sheet group through a rotor punching sheet groove, and sleeving the rotor punching sheet group into the rotating shaft to align the rotor punching sheet group and the rotating shaft.
The method for press-mounting the rotor punching sheet of the motor comprises the steps of dividing the laminated rotor punching sheet into at least two groups of rotor punching sheet groups according to a preset principle, and heating each group of rotor punching sheet groups respectively. And then sleeving the first group of heated rotor punching sheets into the rotating shaft, maintaining the pressure, cooling to below a preset temperature, continuously sleeving the next group of heated rotor punching sheets into the rotating shaft, maintaining the pressure, cooling to below the preset temperature, sequentially sleeving the groups of heated rotor punching sheets into the rotating shaft, maintaining the pressure, and cooling to below the preset temperature to complete the press mounting of the rotor punching sheets. Through the mode of sectional press mounting, in the process of each section of press mounting, the pressure maintaining cooling is carried out through certain pressure maintaining force, and after the cooling, no gap exists between the rotor core and the stop shaft shoulder of the rotating shaft, so that the quality of the rotor core is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a press-fitting method for a motor rotor punching sheet according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a motor rotor punching segment heat sleeve.
The drawings are numbered as follows:
rotor punching sheet group 1.
Detailed Description
The embodiment of the invention discloses a press-fitting method of a motor rotor punching sheet, which aims to solve the problem of a gap between an iron core and a shaft shoulder and avoid axial movement of a rotor during operation.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, fig. 1 is a schematic flow chart illustrating a press-fitting method for a motor rotor punching sheet according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a motor rotor punching segment heat sleeve.
In a specific embodiment, the press-fitting method for the motor rotor punching sheet provided by the invention comprises the following steps:
s1: dividing the laminated rotor punching sheets into at least two groups of rotor punching sheet groups 1 according to a preset principle, and heating each group of rotor punching sheet groups 1;
the method comprises the steps that preparation before shaft sleeving is carried out, after rotor punching sheets are laminated, the rotor punching sheets are divided into at least two groups of rotor punching sheet groups 1 according to a preset principle, and each group of rotor punching sheet groups 1 is heated. Specifically, each group of the rotor punching sheet groups 1 can be heated at the same time, and each group of the rotor punching sheet groups 1 can also be heated in sequence. The specific requirements of heating can be found in the prior art and are not specifically limited herein.
S2: sleeving the heated first group of rotor punching sheet groups 1 into a rotating shaft, maintaining the pressure, and cooling to below a preset temperature;
and after heating, sleeving the first rotor punching sheet group 1 into the rotating shaft, maintaining pressure and cooling, and finishing press mounting of the section of the rotor punching sheet group 1 when the rotor punching sheet group is cooled to be below a preset temperature. The serial numbers of the rotor punching sheet groups 1 can be sequentially sequenced from one end to the other end so as to facilitate the shaft sleeving. Other arrangements may be installed as well as required, and are not limited in particular herein.
S3: and continuously sleeving the next group of the heated rotor punching sheet groups 1 into the rotating shaft, maintaining the pressure, cooling to below the preset temperature, repeating the step until all the groups of the heated rotor punching sheet groups 1 are sleeved into the rotating shaft, maintaining the pressure, and cooling to below the preset temperature. After the first group of rotor punching sheet groups 1 are cooled to below the preset temperature, sleeve shaft of the next group of rotor punching sheet groups 1 is carried out, and the specific sleeve shaft process is the same as the sleeve shaft step of the first group of rotor punching sheet groups 1. And sequentially sleeving shafts of the rotor punching sheets 1 in such a way, and maintaining the pressure when the rotating shaft is sleeved in the last rotor punching sheet group 1, and cooling to below the preset temperature to complete the press mounting of the whole rotor punching sheet.
The method for press-mounting the rotor punching sheet of the motor comprises the steps of dividing the laminated rotor punching sheet into at least two groups of rotor punching sheet groups 1 according to a preset principle, and heating each group of rotor punching sheet groups 1 respectively. And then sleeving the heated first group of rotor punching sheet groups 1 into the rotating shaft, maintaining the pressure, cooling to below a preset temperature, continuously sleeving the heated next group of rotor punching sheet groups 1 into the rotating shaft, maintaining the pressure, cooling to below the preset temperature, sequentially sleeving the heated rotor punching sheet groups 1 into the rotating shaft, maintaining the pressure, and cooling to below the preset temperature to complete the press mounting of the rotor punching sheets. Through the mode of sectional press mounting, in the process of each section of press mounting, the pressure maintaining cooling is carried out through certain pressure maintaining force, and after the cooling, no gap exists between the rotor core and the stop shaft shoulder of the rotating shaft, so that the quality of the rotor core is ensured.
Specifically, the preset temperature is 50 ℃. Namely, when the rotor punching sheet group 1 is cooled to below 50 ℃ under the pressure maintaining condition, the sleeve shaft of the next rotor punching sheet group 1 can be carried out. The preset temperature value may also be adjusted as needed.
Further, the pressure maintaining specifically comprises:
and (5) placing under an oil press for pressure maintaining. That is, in step S2 and step S3, when the pressure maintaining cooling is performed on each set of rotor punching sheet set 1, the pressure maintaining can be performed by the hydraulic press. The oil press is adopted to control the pressure conveniently, and the operation is simple. Other conventional equipment capable of providing pressure may also be used for holding pressure as desired.
Specifically, the number of the rotor sheets included in each group of the rotor sheet groups 1 is equal. That is, the preset principle may be specifically that a preset number of rotor sheets are a group, and the size of the specific preset number may be set as required to meet the final press-fitting requirement, and is not specifically limited herein. The number of the rotor punching sheets of each group of rotor punching sheets is equal, so that pressure maintaining and cooling are facilitated. According to the requirement, the preset principle can also be other set rules, and the number of the rotor punching sheets included in each rotor punching sheet group 1 can also be different.
In the foregoing embodiments, the preset rule specifically includes:
and ensuring that the pressure maintaining force of each group after grouping is greater than the pushing force, wherein the pressure maintaining force is the pressure for ensuring the pressure between the rotor punching sheets to perform pressure maintaining cooling, and the pushing force is the minimum pushing force caused by the interference magnitude of the rotor punching sheets. Namely, when grouping, the pressure maintaining is determined by combining the pressure of pressure maintaining cooling, and the number of the inner rotor punching sheets in the group is required to meet the condition that the pressure maintaining force is greater than the minimum thrust caused by the interference of the rotor punching sheets. According to the principle, the subsequent pressure maintaining cooling process and sleeve shaft operation can be ensured. The pressure maintaining force is larger than the pushing force, so that a gap is not formed between the rotor punching sheets in the rotor punching sheet group 1 for pressure maintaining each time. According to the requirement, the preset principle can also be directly set as a group according to a certain number of rotor punching sheets.
On the basis of the above embodiments, in step S3, the next set of heated rotor punching sheet set 1 is sleeved on the rotating shaft, which specifically includes:
and continuously positioning the next group of the heated rotor punching sheet groups 1 adjacent to the previous group of the rotor punching sheet groups 1 through the rotor punching sheet slots, and sleeving the rotating shaft to align the two groups of the heated rotor punching sheet groups. Namely, the heated rotor punching sheet group 1 is sleeved into the rotating shaft in sequence, pressure maintaining is carried out, and the rotor punching sheet group is cooled to a preset temperature. When two adjacent rotor punching sheet groups 1 are sleeved, the rotor punching sheets are positioned through the rotor punching sheet grooves, and the alignment of the rotor punching sheets is ensured. The rotor punching sheet can be positioned by other positioning structures or methods according to needs so as to ensure the alignment of the rotor punching sheets.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. A press-fitting method of a motor rotor punching sheet is characterized by comprising the following steps:
dividing the laminated rotor punching sheets into at least two groups of rotor punching sheet groups according to a preset principle, and heating each group of rotor punching sheet groups;
sleeving the heated first group of rotor punching sheets into a rotating shaft, maintaining the pressure, and cooling to below a preset temperature;
continuously sleeving the next group of the heated rotor punching sheet group into the rotating shaft, maintaining the pressure, cooling to below a preset temperature, repeating the step until all the groups of the heated rotor punching sheet groups are sleeved into the rotating shaft, maintaining the pressure, and cooling to below the preset temperature;
the preset principle specifically includes:
and ensuring that the pressure maintaining force of each group is greater than the pushing force after grouping, wherein the pressure maintaining force is the pressure for ensuring the pressure between the rotor punching sheets to perform pressure maintaining cooling, and the pushing force is the minimum pushing force caused by the interference magnitude of the rotor punching sheets.
2. A press fitting method for motor rotor punching sheets according to claim 1, wherein the preset temperature is 50 ℃.
3. The press-fitting method for the motor rotor punching sheet according to claim 1, wherein the pressure maintaining specifically comprises:
and (5) placing under an oil press for pressure maintaining.
4. A press fitting method for motor rotor sheets according to claim 1, wherein the number of the rotor sheets included in each group of the rotor sheet groups is equal.
5. A press fitting method for motor rotor punching sheets according to any one of claims 1-4, wherein the step of continuously sleeving the next set of heated rotor punching sheets on the rotating shaft specifically comprises the steps of:
and continuously positioning the next group of the heated rotor punching sheet group adjacent to the previous group of the heated rotor punching sheet group through a rotor punching sheet groove, and sleeving the rotor punching sheet group into the rotating shaft to align the rotor punching sheet group and the rotating shaft.
CN201810531986.3A 2018-05-29 2018-05-29 Press mounting method for motor rotor punching sheet Active CN108683306B (en)

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Application Number Priority Date Filing Date Title
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CN108683306B true CN108683306B (en) 2020-08-07

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110784076A (en) * 2019-11-13 2020-02-11 中车戚墅堰机车有限公司 Press mounting device and press mounting process for squirrel cage rotating shaft of alternating-current traction motor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101222165A (en) * 2007-01-09 2008-07-16 上海电气集团上海电机厂有限公司 Press mounting method of electric machine rotor iron core
JP2008199831A (en) * 2007-02-15 2008-08-28 Aichi Elec Co Motor manufacturing method, and motor, compressor and vehicle using the manufacturing method
CN102208849A (en) * 2011-03-07 2011-10-05 江苏通达动力科技股份有限公司 Hot sleeve shaft technology of wind-power rotor
CN104410221A (en) * 2014-12-17 2015-03-11 哈尔滨电气动力装备有限公司 Thermal laminating technology for large shielded motor rotor punching plates
CN106981958A (en) * 2017-05-23 2017-07-25 中达电机股份有限公司 A kind of internal permanent magnet synchronous motor rotor assembling method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101222165A (en) * 2007-01-09 2008-07-16 上海电气集团上海电机厂有限公司 Press mounting method of electric machine rotor iron core
JP2008199831A (en) * 2007-02-15 2008-08-28 Aichi Elec Co Motor manufacturing method, and motor, compressor and vehicle using the manufacturing method
CN102208849A (en) * 2011-03-07 2011-10-05 江苏通达动力科技股份有限公司 Hot sleeve shaft technology of wind-power rotor
CN104410221A (en) * 2014-12-17 2015-03-11 哈尔滨电气动力装备有限公司 Thermal laminating technology for large shielded motor rotor punching plates
CN106981958A (en) * 2017-05-23 2017-07-25 中达电机股份有限公司 A kind of internal permanent magnet synchronous motor rotor assembling method

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