CN112531994A - Stator heating method - Google Patents
Stator heating method Download PDFInfo
- Publication number
- CN112531994A CN112531994A CN202011335264.4A CN202011335264A CN112531994A CN 112531994 A CN112531994 A CN 112531994A CN 202011335264 A CN202011335264 A CN 202011335264A CN 112531994 A CN112531994 A CN 112531994A
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- China
- Prior art keywords
- stator
- resin
- heating
- coil
- varnish
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
Abstract
The invention discloses a stator heating method, which comprises the following steps: firstly, roughening the surface of a stator, then cleaning and drying the stator to remove moisture attached to the end part of a stator coil, preheating the stator for later use, adding a resin material into an extruding machine, extruding molten resin through the extruding machine, and adding a proper amount of diluent into the molten resin; the stator preheating device has the advantages of reducing the heating time of the stator, efficiently and uniformly preheating the stator to a fixed temperature range, improving the heating efficiency of the stator, further improving the production quality and the production efficiency of the stator, solving the defects that the resin is not preheated at present, long time is needed for curing the resin, the liquidity is obviously poor during resin molding, and unfilled and the like can be caused, thereby reducing the production quality of the stator, and further prolonging the service life of the stator.
Description
Technical Field
The invention relates to the technical field of stator production and processing, in particular to a stator heating method.
Background
The asynchronous motor is also called as an induction motor and comprises a shell, an end cover, a stator, a rotor, a bearing and the like, wherein the stator is a static part of the motor or a generator and comprises a machine base, a stator core, a stator winding and the like, and the rotor is a rotating part of the motor and comprises a rotor core, a rotor winding, a rotating shaft and the like. The main function of the stator is to generate a rotating magnetic field, and the main function of the rotor is to be cut by magnetic lines of force in the rotating magnetic field to generate current. The asynchronous motor generates electromagnetic torque through interaction of an air gap rotating magnetic field and induction current of a rotor winding, so that electromechanical energy is converted into mechanical energy.
In a stator used in a motor, in a state in which a wire coil is wound around a stator core, coil ends are insulated and protected by a varnish impregnation method in which a varnish is impregnated between the wire coils and heated to cure the varnish, or a resin molding method in which a resin is injected into the coil ends of the stator by a mold and molded, and an insulating resin is filled between the wire coils.
In the production and processing of the stator, the stator usually needs to be put into a mold for insert injection molding, but the stator is not preheated at present, a long time is needed for curing resin, and if the stator is not heated, the fluidity is obviously deteriorated during resin molding, and defects such as unfilled phenomenon may be caused, thereby seriously affecting the production quality of the stator.
Disclosure of Invention
The invention aims to provide a stator heating method, which has the advantages of reducing the heating time of a stator, efficiently and uniformly preheating the stator to a fixed temperature range, improving the heating efficiency of the stator, further improving the production quality and the production efficiency of the stator, and solving the problem that the production quality of the stator is reduced because the stator is not preheated at present, long time is needed for curing resin, the flowability is obviously poor during resin molding, and the defects of non-filling and the like are possibly caused.
In order to achieve the purpose, the invention provides the following technical scheme: a method of heating a stator, the method comprising the steps of:
(1) a preheating procedure: firstly, roughening the surface of a stator, then cleaning and drying the stator to remove moisture attached to the end part of a stator coil, and preheating the stator for later use;
(2) resin molding: adding a resin material into an extruding machine, extruding molten resin by the extruding machine, adding a proper amount of diluent into the molten resin, injecting the resin to the coil end part of the stator by using a mould, configuring a shielding body for high-frequency induction heating, and molding the resin at the coil end part by the high-frequency induction heating;
(3) coil processing: fixing the stator in a paint spraying device, spraying varnish on the surface of the stator to enable the varnish to be uniformly distributed in gaps of the stator coil, preheating the stator to reduce the viscosity of the varnish and avoid the varnish from dropping, and transferring the stator to a curing process after paint spraying is finished;
(4) heating and curing: the stator after the paint spraying treatment is placed in a heating device for graded heating and curing, and hot air with a preset temperature is sprayed to the stator, so that the uneven temperature of the stator heated in the heating device can be uniformly heated, and the condition of poor molding caused by midway solidification is reduced;
(5) stator molding: after solidification, the stators are arranged in order and cooled in a natural state, and the stators with excellent production quality can be obtained.
Preferably, in the step (1), the preheating temperature of the stator is 80-100 ℃, and the heat treatment time is 1 h.
Preferably, in the step (1), the preheating is performed by disposing a high-frequency induction coil near a coil end of the stator, and then energizing the induction coil to perform high-frequency induction heating on the stator.
Preferably, in the step (2), a thermosetting resin is used as a raw material in the resin molding process, and the thermosetting resin is an epoxy resin.
Preferably, in the step (2), the diluent is one of butanediol or glycerol, and the dosage of the diluent is 5-20%.
Preferably, in the step (2), the heating temperature for heating and molding the resin is 120-150 ℃, and the heating time is 2 hours.
Preferably, in the step (3), the varnish sprayed on the stator coil is an insulating varnish, and the varnish is composed of resin as a main film-forming substance plus a solvent.
Preferably, in the step (4), the treatment temperatures of the staged curing are 60 ℃, 80 ℃, 100 ℃ and 120 ℃, respectively, and the treatment time is 2 hours.
Compared with the prior art, the invention has the following beneficial effects:
the stator preheating device has the advantages of reducing the heating time of the stator, efficiently and uniformly preheating the stator to a fixed temperature range, improving the heating efficiency of the stator, further improving the production quality and the production efficiency of the stator, and solving the problems that the flowability is obviously poor during resin molding, the defects of non-filling and the like are possibly caused due to the fact that the resin needs to be cured for a long time without preheating the stator at present, so that the production quality of the stator is reduced, the service life of the stator can be prolonged, and the working performance of a motor is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.
A method of heating a stator, the method comprising the steps of:
(1) a preheating procedure: firstly, roughening the surface of a stator, then cleaning and drying the stator to remove moisture attached to the end part of a stator coil, and preheating the stator for later use;
(2) resin molding: adding a resin material into an extruding machine, extruding molten resin by the extruding machine, adding a proper amount of diluent into the molten resin, injecting the resin to the coil end part of the stator by using a mould, configuring a shielding body for high-frequency induction heating, and molding the resin at the coil end part by the high-frequency induction heating;
(3) coil processing: fixing the stator in a paint spraying device, spraying varnish on the surface of the stator to enable the varnish to be uniformly distributed in gaps of the stator coil, preheating the stator to reduce the viscosity of the varnish and avoid the varnish from dropping, and transferring the stator to a curing process after paint spraying is finished;
(4) heating and curing: the stator after the paint spraying treatment is placed in a heating device for graded heating and curing, and hot air with a preset temperature is sprayed to the stator, so that the uneven temperature of the stator heated in the heating device can be uniformly heated, and the condition of poor molding caused by midway solidification is reduced;
(5) stator molding: after solidification, the stators are arranged in order and cooled in a natural state, and the stators with excellent production quality can be obtained.
The first embodiment is as follows:
a method of heating a stator, the method comprising the steps of:
(1) a preheating procedure: firstly, roughening the surface of a stator, then cleaning and drying the stator to remove moisture attached to the end part of a stator coil, preheating the stator for later use, wherein the preheating temperature of the stator is 80-100 ℃, and the heat treatment time is 1 h;
(2) resin molding: adding a resin material into an extruding machine, extruding molten resin by the extruding machine, adding a proper amount of diluent into the molten resin, injecting the resin to the coil end part of the stator by using a mould, configuring a shielding body for high-frequency induction heating, and molding the resin at the coil end part by the high-frequency induction heating;
(3) coil processing: fixing the stator in a paint spraying device, spraying varnish on the surface of the stator to enable the varnish to be uniformly distributed in gaps of the stator coil, preheating the stator to reduce the viscosity of the varnish and avoid the varnish from dropping, and transferring the stator to a curing process after paint spraying is finished;
(4) heating and curing: the stator after the paint spraying treatment is placed in a heating device for graded heating and curing, and hot air with a preset temperature is sprayed to the stator, so that the uneven temperature of the stator heated in the heating device can be uniformly heated, and the condition of poor molding caused by midway solidification is reduced;
(5) stator molding: after solidification, the stators are arranged in order and cooled in a natural state, and the stators with excellent production quality can be obtained.
Example two:
a method of heating a stator, the method comprising the steps of:
(1) a preheating procedure: firstly, roughening the surface of a stator, then cleaning and drying the stator to remove moisture attached to the end part of a stator coil, preheating the stator for later use, wherein the preheating temperature of the stator is 80-100 ℃, and the heat treatment time is 1 h;
(2) resin molding: adding a resin material into an extruding machine, extruding molten resin by the extruding machine, adding a proper amount of diluent into the molten resin, injecting the resin to the coil end of a stator by using a mold, configuring a shielding body for high-frequency induction heating, and forming the resin at the coil end by the high-frequency induction heating, wherein the resin molding process adopts thermosetting resin as a raw material, the thermosetting resin is epoxy resin, the diluent is one of butanediol or glycerol, the diluent is 5-20%, the heating temperature during the resin heating forming is 120-150 ℃, the heating time is 2 hours, the coil end can be protected, the insulating capacity of the end of the stator coil is increased, the curing rate of the resin can be increased, and the production and processing efficiency of the stator is increased;
(3) coil processing: fixing the stator in a paint spraying device, spraying varnish on the surface of the stator to enable the varnish to be uniformly distributed in gaps of the stator coil, preheating the stator to reduce the viscosity of the varnish and avoid the varnish from dropping, and transferring the stator to a curing process after paint spraying is finished;
(4) heating and curing: the stator after the paint spraying treatment is placed in a heating device for graded heating and curing, and hot air with a preset temperature is sprayed to the stator, so that the uneven temperature of the stator heated in the heating device can be uniformly heated, and the condition of poor molding caused by midway solidification is reduced;
(5) stator molding: after solidification, the stators are arranged in order and cooled in a natural state, and the stators with excellent production quality can be obtained.
Example three:
a method of heating a stator, the method comprising the steps of:
(1) a preheating procedure: firstly, roughening the surface of a stator, then cleaning and drying the stator to remove moisture attached to the end part of a stator coil, preheating the stator for later use, wherein the preheating temperature of the stator is 80-100 ℃, and the heat treatment time is 1 h;
(2) resin molding: adding a resin material into an extruding machine, extruding molten resin by the extruding machine, adding a proper amount of diluent into the molten resin, injecting the resin to the coil end of a stator by using a mold, configuring a shielding body for high-frequency induction heating, and forming the resin at the coil end by the high-frequency induction heating, wherein the resin molding process adopts thermosetting resin as a raw material, the thermosetting resin is epoxy resin, the diluent is one of butanediol or glycerol, the diluent is 5-20%, the heating temperature during the resin heating forming is 120-150 ℃, the heating time is 2 hours, the coil end can be protected, the insulating capacity of the end of the stator coil is increased, the curing rate of the resin can be increased, and the production and processing efficiency of the stator is increased;
(3) coil processing: fixing the stator in a paint spraying device, spraying varnish on the surface of the stator to enable the varnish to be uniformly distributed in gaps of the stator coil, preheating the stator in order to reduce the viscosity of the varnish and avoid the varnish from dropping, transferring the stator to a curing process after paint spraying is finished, wherein the varnish sprayed on the stator coil is insulating varnish, and the varnish is formed by adding a solvent and resin serving as a main film forming substance, so that the varnish can fully enter the gaps between the stator coils, the structural strength of an electronic coil is increased, and the stator coil is prevented from being broken in the working process;
(4) heating and curing: the stator after paint spraying treatment is placed in a heating device for graded heating and curing, the uneven temperature of the stator heated in the heating device can be uniformly heated by spraying hot air with a preset temperature to the stator, the condition that poor forming is caused by midway solidification is reduced, the treatment temperature of graded curing is respectively 60 ℃, 80 ℃, 100 ℃ and 120 ℃, the treatment time is 2 hours, the curing effect of varnish can be increased, the varnish is ensured to be dried more fully, and the production quality of the stator can be improved. The service life of the stator is prolonged;
(5) stator molding: after solidification, the stators are arranged in order and cooled in a natural state, and the stators with excellent production quality can be obtained.
The stator preheating device has the advantages of reducing the heating time of the stator, efficiently and uniformly preheating the stator to a fixed temperature range, improving the heating efficiency of the stator, further improving the production quality and the production efficiency of the stator, and solving the problems that the flowability is obviously poor during resin molding, the defects of non-filling and the like are possibly caused due to the fact that the resin needs to be cured for a long time without preheating the stator at present, so that the production quality of the stator is reduced, the service life of the stator can be prolonged, and the working performance of a motor is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A stator heating method, characterized by: the method comprises the following steps:
(1) a preheating procedure: firstly, roughening the surface of a stator, then cleaning and drying the stator to remove moisture attached to the end part of a stator coil, and preheating the stator for later use;
(2) resin molding: adding a resin material into an extruding machine, extruding molten resin by the extruding machine, adding a proper amount of diluent into the molten resin, injecting the resin to the coil end part of the stator by using a mould, configuring a shielding body for high-frequency induction heating, and molding the resin at the coil end part by the high-frequency induction heating;
(3) coil processing: fixing the stator in a paint spraying device, spraying varnish on the surface of the stator to enable the varnish to be uniformly distributed in gaps of the stator coil, preheating the stator to reduce the viscosity of the varnish and avoid the varnish from dropping, and transferring the stator to a curing process after paint spraying is finished;
(4) heating and curing: the stator after the paint spraying treatment is placed in a heating device for graded heating and curing, and hot air with a preset temperature is sprayed to the stator, so that the uneven temperature of the stator heated in the heating device can be uniformly heated, and the condition of poor molding caused by midway solidification is reduced;
(5) stator molding: after solidification, the stators are arranged in order and cooled in a natural state, and the stators with excellent production quality can be obtained.
2. A stator heating method according to claim 1, wherein: in the step (1), the preheating temperature of the stator is 80-100 ℃, and the heat treatment time is 1 h.
3. A stator heating method according to claim 1, wherein: in the step (1), the preheating method is to arrange a high-frequency induction coil near the coil end of the stator, and then the induction coil is electrified to perform high-frequency induction heating on the stator.
4. A stator heating method according to claim 1, wherein: in the step (2), thermosetting resin is used as a raw material in the resin molding process, and the thermosetting resin is epoxy resin.
5. A stator heating method according to claim 1, wherein: in the step (2), the diluent is one of butanediol or glycerol, and the dosage of the diluent is 5-20%.
6. A stator heating method according to claim 1, wherein: in the step (2), the heating temperature of the resin during heating and forming is 120-150 ℃, and the heating time is 2 hours.
7. A stator heating method according to claim 1, wherein: in the step (3), the varnish sprayed on the stator coil is insulating varnish, and the varnish is composed of resin as a main film forming material and a solvent.
8. A stator heating method according to claim 1, wherein: in the step (4), the treatment temperatures of the graded curing are respectively 60 ℃, 80 ℃, 100 ℃ and 120 ℃, and the treatment time is 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011335264.4A CN112531994A (en) | 2020-11-24 | 2020-11-24 | Stator heating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011335264.4A CN112531994A (en) | 2020-11-24 | 2020-11-24 | Stator heating method |
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| Publication Number | Publication Date |
|---|---|
| CN112531994A true CN112531994A (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011335264.4A Pending CN112531994A (en) | 2020-11-24 | 2020-11-24 | Stator heating method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09260158A (en) * | 1996-03-27 | 1997-10-03 | Hitachi Ltd | Resin-molded coil |
| CN1745510A (en) * | 2003-04-28 | 2006-03-08 | 三菱电机株式会社 | Method for manufacturing stator of rotary motor |
| CN101548453A (en) * | 2007-01-12 | 2009-09-30 | 株式会社Oet | Apparatus and method for heating stator coil |
| CN101627526A (en) * | 2007-02-08 | 2010-01-13 | 丰田自动车株式会社 | Method and device for heating stator |
| CN105321705A (en) * | 2015-10-14 | 2016-02-10 | 国家电网公司 | Pouring technology for dry-type transformer coils |
| CN106100251A (en) * | 2016-07-19 | 2016-11-09 | 西安微电机研究所 | A kind of manufacture method of straight winding thin-walled hollow rotor cup |
-
2020
- 2020-11-24 CN CN202011335264.4A patent/CN112531994A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09260158A (en) * | 1996-03-27 | 1997-10-03 | Hitachi Ltd | Resin-molded coil |
| CN1745510A (en) * | 2003-04-28 | 2006-03-08 | 三菱电机株式会社 | Method for manufacturing stator of rotary motor |
| CN101548453A (en) * | 2007-01-12 | 2009-09-30 | 株式会社Oet | Apparatus and method for heating stator coil |
| CN101627526A (en) * | 2007-02-08 | 2010-01-13 | 丰田自动车株式会社 | Method and device for heating stator |
| CN105321705A (en) * | 2015-10-14 | 2016-02-10 | 国家电网公司 | Pouring technology for dry-type transformer coils |
| CN106100251A (en) * | 2016-07-19 | 2016-11-09 | 西安微电机研究所 | A kind of manufacture method of straight winding thin-walled hollow rotor cup |
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Application publication date: 20210319 |