CN104426303A - Assembling method for permanent magnet direct-current motors and permanent magnet direct-current motor assembled by same - Google Patents
Assembling method for permanent magnet direct-current motors and permanent magnet direct-current motor assembled by same Download PDFInfo
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- CN104426303A CN104426303A CN201310365612.6A CN201310365612A CN104426303A CN 104426303 A CN104426303 A CN 104426303A CN 201310365612 A CN201310365612 A CN 201310365612A CN 104426303 A CN104426303 A CN 104426303A
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Abstract
The invention relates to an assembling method for permanent magnet direct-current motors and a permanent magnet direct-current motor assembled by the same. The permanent magnet direct-current motor comprises a cylindrical metal shell and a cylindrical permanent magnet. The assembling method comprises the following steps: (a) heating the shell to a predetermined heating temperature; (b) pressing the permanent magnet into a predetermined installation position in the shell along the axial direction of the shell; (c) preserving heat for a period of time; and (d) cooling the shell and the permanent magnet, wherein the shell and the permanent magnet are in interference fit with each other. The invention further relates to a permanent magnet direct-current motor assembled by the method. The assembling method of the invention is time-saving and efficient. The permanent magnet and the shell of the permanent magnet direct-current motor of the invention are highly concentric.
Description
Technical field
The present invention relates to a kind of assembly method for permanent magnet DC motor, relate more specifically to assembly method set of permanent magnets installed in motor housing, in addition, also relate to the permanent magnet DC motor that assembly method thus obtains.
Background technology
In the prior art, the DC micro-motor being generally used for automotive seat Wei Ge adjustment is permanent magnet DC motor, and the most frequently used pole material is ferrite or neodymium iron boron etc.The pole piece be made up of these pole material can adopt the form of magnetic cylinder or magnet ring.At present, when assembling motor, before magnetic cylinder is loaded motor housing, spreading glue (industrial is generally A/B glue, the A/B glue of the special brand of such as Kraft) between magnetic cylinder and shell in advance, then, magnetic cylinder is loaded shell (being matched in clearance) between the two, afterwards, the magnetic cylinder be set in together and shell Fang Ge are toasted one hour, to ensure magnetic cylinder pulling-out force in the enclosure in the high-temperature cabinet of baking temperature about 85 DEG C.
In existing assemble method, this bake process not only expends man-hour, and magnetic cylinder has slight demagnetization phenomenon in high-temperature cabinet, thus causes motor power output to reduce.In addition, because the coating thickness of glue is uneven, the concentricity causing magnetic cylinder to install in the enclosure is not high, and noise is large in the running to cause assembled motor.
Therefore, the present invention is intended to find a kind of assembly method for permanent magnet DC motor or permanent magnet DC motor that can overcome above-mentioned one or more problem in prior art.
Summary of the invention
One aspect of the present invention provides a kind of assembly method for permanent magnet DC motor, this permanent magnet DC motor comprises the shell of metal tubular and the permanent magnet of tubular, and this assembly method makes it possible to be installed in the enclosure by permanent magnet with high assembly line operating efficiency, high concentricity.
Above-mentioned purpose is realized by the assembly method with following technical characteristic:
This assembly method comprises step: a) described shell is heated to predetermined heating-up temperature; B) described permanent magnet is pressed into described shell to predetermined An Zhuan Wei Ge along the axis of described shell; C) a period of time is incubated; And d) cool described shell and permanent magnet, wherein, between described shell and described permanent magnet, form interference fit.By described assembly method, advantageously guarantee the inwall of shell and the outer wall height close contact of permanent magnet, thus obtain high concentricity.
In a preferred embodiment, before a) step or while carrying out a) step at the inwall coating anaerobic adhesive of described shell.The use of anaerobic adhesive makes it possible to the assembling intensity added further between strong permanent magnet and shell.Before a) step, anaerobic adhesive is coated on outer casing inner wall and can guarantees that the uniformity that anaerobic adhesive applies is better.And carrying out a) being coated on outer casing inner wall by anaerobic adhesive while step reducing because anaerobic adhesive solidifies the resistance of pressing in caused, and whole assembly technology required time can be shortened further.
In one embodiment, described permanent magnet is made up of neodymium iron boron, and described shell is made up of plated steel sheet, and described predetermined heating-up temperature is 100 DEG C.Permanent magnet height in the enclosure can be obtained by this assembly method and concentricity is installed.
Advantageously, in c) step, temperature retention time is the several seconds, is preferably 2 seconds.The temperature retention time of several seconds is just enough to the viscous force guaranteeing that anaerobic adhesive applies between permanent magnet and shell, and thus avoid in existing assembly method the baking time reaching 1 hour, therefore the operating efficiency on whole assembly line can improve greatly.
Advantageously, in b) step, the axis of described shell is vertical direction, and described permanent magnet is from top to bottom pressed in described shell.Permanent magnet is pressed into shell from top to bottom, simple comparatively speaking, and it is low to control cost.
In a preferred embodiment, described a) step comprises and heats described shell with the electrical heating wire be wrapped on the outer wall of described shell.Heating casing is carried out by electrical heating wire, simple, and facilitate regulating and controlling, therefore operating cost and control cost low.
Advantageously, the region corresponding with pre-Dingan County dress position Ge of described permanent magnet on the outer wall of described shell is wrapped at described electrical heating wire.Because heating is just for the Ju Bu Wei Ge of shell, make it possible to while almost ensureing to assemble effect on an equal basis, the power consumption of heating can be down to minimum.
In a preferred embodiment, before a) step or carrying out a) while step or in a) step and b) between step, described shell is removably mounted on fixed pedestal, described permanent magnet is arranged on stationary fixture and aims at location relative to described shell.
In an advantageous embodiment, in b) step, by the breach of She Ge in one end of described permanent magnet or boss Yu She Ge at the boss of the Xiang Ying Wei Ge of the inwall of described shell or coordinating of breach guarantee the An Zhuan Wei Ge of described permanent magnet in described shell.By means of location structures such as above-mentioned boss or breach, guarantee that permanent magnet is in enclosure axis compression distance upwards (or permanent magnet axial location on shell), thus, make it possible to according to design in advance to assemble permanent magnet, and then the axis peace dress position Ge avoiding causing permanent magnet on shell due to misoperation and different design in advance.In addition, permanent magnet can also advantageously to be realized in whole assembling process relative to the aligning of shell.
According to a further aspect in the invention, provide a kind of permanent magnet DC motor, comprise the shell of metal tubular and the permanent magnet of tubular, wherein said permanent magnet is installed in the housing by above-mentioned assembly method.
Can guarantee concentricity high between shell and permanent magnet according to permanent magnet DC motor of the present invention and guarantee that motor has low noise level, in addition, permanent magnet DC motor of the present invention is easy to assembly, and technique is consuming time short, and assembly line efficiency is high.
Permanent magnet DC motor of the present invention is suitable in the car especially, such as, be used as the motor of adjusting seat horizontal direction movement, in order to promote the comfortableness of car load.
Accompanying drawing explanation
Fig. 1 illustrates the general assembly schematic diagram according to permanent magnet DC motor of the present invention;
Fig. 2 illustrates the stereogram of the package assembly according to shell of the present invention and magnetic cylinder;
Fig. 3 illustrates the enlarged partial isometric view of the package assembly according to shell of the present invention and magnetic cylinder; And
Fig. 4 illustrates the stereogram of the magnetic cylinder according to permanent magnet DC motor of the present invention.
Reference numerals list
1 permanent magnet DC motor
2 shells
21 boss
3 permanent magnets
31 breach
4 rotor assemblies
41 rotors
42 commutators
43 rotating shafts
Embodiment
Below will be concrete with reference to various embodiments of the present invention, the example of described embodiment is shown in the drawings.As possible, all use identical Reference numeral to represent identical or similar parts in all of the figs.
The permanent magnet DC motor 1 of a kind of small-sized efficient shown in Fig. 1, it comprises shell 2, permanent magnet 3, rotor assembly 4 etc.Wherein, rotor assembly 4 comprises rotor 41, commutator 43 and rotating shaft 44 etc.Shell 2 is by metal cylindrical outer casing.Permanent magnet 3 is magnetic cylinder or the magnet ring of cartridge form or loop type.Permanent magnet 3 can be made up of materials such as Agglutinate neodymium-iron-boron, aluminium nickel cobalts.In a preferred embodiment, shell 2 is made up of plated steel sheet, and permanent magnet 3 is made up of neodymium iron boron.
In an embodiment according to the present invention, permanent magnet 3 is fixed by being press-fitted incompatible shell 2 inwall of being close to.Particularly preferably, permanent magnet 3 is assembled in shell 2 by " hot pressing " mode.
Described herein " hot pressing " refers to when shell is heated to predetermined temperature, permanent magnet is pressed into the pre-Dingan County dress position Ge to permanent magnet in the shell be heated, then, the assembly be made up of shell and permanent magnet is cooled, by the assembling of the high concentricity realized between shell and permanent magnet of expanding with heat and contract with cold of shell.
Particularly, the internal diameter of reasonable design shell and the external diameter of permanent magnet in advance, guarantee that fit tolerance between shell and permanent magnet is in rational scope of design, namely ensure that the gap between permanent magnet and shell makes permanent magnet easily load and permanent magnet and shell can be made to be in the state of interference fit.
According to the present invention, the process be assembled to by permanent magnet in shell is divided into following several stages:
-the preparatory stage: by shell removably and be arranged on vertically on fixed pedestal.Permanent magnet is removably mounted on stationary fixture.Located relative to the aligning of shell by the control realization permanent magnet of the movement to stationary fixture.Electrical heating wire on ambient envelope cover, the region sheathed electrical heating wire corresponding with pre-Dingan County dress position Ge of permanent magnet preferably on the outer wall of shell.The inwall of shell applies one deck anaerobic adhesive equably.There is no specific execution sequence between above-mentioned preparatory process, consider from the angle shortening technique spent time, can executed in parallel multiple operations wherein in exercisable scope.
-the heating period: to electrical heating wire energising, shell is heated to predetermined heating-up temperature (in the region corresponding with permanent magnet pre-Dingan County dress position Ge of shell, this predetermined heating-up temperature is more than 100 DEG C to the measurement point cloth Ge of this temperature usually).By can guarantee the predetermined temperature reaching shell within the as far as possible short time to the real-time regulation and control of heater strip heating power.Mode of heating for shell is not limited to the given example with electrical heating wire heating casing.It may occur to persons skilled in the art that the mode of other available heating casings, such as, shell is had the heating collar etc. of heat medium as in heating bathing pool or by the local sleeve of shell wherein circulates.In the specific embodiment that shell 2 is made up of plated steel sheet wherein, permanent magnet 3 is made up of neodymium iron boron, predetermined heating-up temperature is 100 DEG C.
-press-in the stage: the displacement being controlled stationary fixture by controller, pressure is applied to permanent magnet, make permanent magnet axially wriggling to the axial depths position Ge of shell along shell from top to bottom, thus permanent magnet is pressed into the pre-Dingan County dress position Ge to permanent magnet in shell.In the process of press in of permanent magnet, uninterrupted to the heating of shell.Shell after being heated can expand in certain amplitude diametrically, thus vacates necessary space to the immigration of permanent magnet.
-holding stage: when permanent magnet arrives its pre-Dingan County dress position Ge in the enclosure, stop exerting pressure to permanent magnet, and adjust the heating power of electrical heating wire, make shell be in keeping warm mode.Shell is made to maintain a period of time under this keeping warm mode.This time period is generally the several seconds.In the specific embodiment that shell 2 is made up of plated steel sheet wherein, permanent magnet 3 is made up of neodymium iron boron, this time period is preferably 2 seconds.
-cooling stage: pull down shell from fixed pedestal and thus take off the assembly be made up of permanent magnet and shell, this assembly being cooled to normal temperature state, thus completing permanent magnet to the assembling in shell.At cooling stage, permanent magnet 3 and shell 2 cool naturally, permanent magnet and shell all can slightly shrink due to the reduction of temperature, because the amplitude of deformation of shell 2 is large compared with the amplitude of deformation of permanent magnet 3, therefore shell is made radial direction, inwardly can be adjacent to permanent magnet further, and then guarantee concentricity high between shell and permanent magnet, thus be conducive to the noise reducing the permanent magnet DC motor assembled.
In fact, consuming time in order to shorten technique, the process portion in the preparatory stage can carry out or carry out between heating period and press-in stage together with the heating process in the heating period.Those skilled in the art can adjust accordingly according to the comfort level of concrete operations or requirement consuming time etc.
As shown in Figure 2, the perisporium of permanent magnet 3 and the inwall of shell 2 are close to.Because permanent magnet 3 is installed in shell 2 by the mode of " hot pressing ", therefore, compared with traditional mounting process, the baking time of shell and permanent magnet can be omitted, reduce the possibility of permanent magnet demagnetization in bake process, moreover, due to the shortening of whole assembly technology spent time, the operating efficiency on assembly line greatly can be improved.
In one embodiment, anaerobic adhesive also can be coated on the inwall of shell while to shell heating, thus is more conducive to shortening whole assembly technology spent time further.Usually, the condition of cure of anaerobic adhesive is: (1) starvation, and gap General Requirements is less than 0.2mm; (2) there is active initiation center, as metal, promoter.Before permanent magnet is pressed into shell, the condition of cure of anaerobic adhesive does not also reach.And only have when permanent magnet is pressed in shell, uncured anaerobic adhesive between permanent magnet and shell progressively fills up gap between permanent magnet and shell (although be interference fit between the two, but the roughness had due to local, surface still can provide spatial accommodation to anaerobic adhesive).Now, the condition of cure of anaerobic adhesive begins to take shape.
When being in keeping warm mode (comparatively speaking at holding stage shell and permanent magnet, under shell is in higher temperature) time, higher temperature due to shell is more conducive to the rapid curing of anaerobic adhesive, anaerobic adhesive curing rate is accelerated, therefore, temperature retention time maintains the several seconds to be just enough to obtain enough viscous force, thus guarantees the relative sliding that can not produce permanent magnet and shell when taking out shell and permanent magnet.It is short that whole press-in stage and holding stage amount to the duration, and heated portion only has the outer surface of permanent magnet, and because permanent magnet itself has low heat conductivility, the contact of permanent magnet outer surface and high temperature enclosure short time can not cause the demagnetization of permanent magnet.Along with the cold events at cooling stage housing, between permanent magnet and shell, form the interference fit of appropriateness, the anaerobic adhesive between permanent magnet and shell is in oxygen-free environment, and thus in the situation not needing extra baking, anaerobic adhesive can keep good viscosity.
Composition graphs 3 and Fig. 4 can find out, in further advantageous embodiment, Shang an end face of permanent magnet 3, She Ge has two symmetrical locating notches 31, a predetermined axle at shell 2 on the inwall of shell is provided with inwardly protruded boss 21 to Ge place, position, this boss 21 matches with the locating notch 31 on permanent magnet 3 end face, makes it possible to guarantee that permanent magnet 3 is fixed on the Ge place, dress position of pre-Dingan County in shell 2.Certainly, those skilled in the art also easily expect: on the inwall of shell 2, establish Ge to be with reeded bulge-structure at predetermined axial and circumferential position Ge, establish Ge along the axially extended projection of permanent magnet at the position Ge that answers mutually of the predetermined end face of permanent magnet 3, realize permanent magnet location and installation in the enclosure by the cooperation of the projection on the groove on described shell and described permanent magnet.By means of above-mentioned location structure, be both conducive to permanent magnet in the preparatory stage and, relative to the aligning positioning work of shell, the control to permanent magnet compression distance in the press-in stage can also be conducive to.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, to those skilled in the art, multiple improvement and modification can be made when not departing from scope of the present invention to Zhuan Ge of the present invention.Those skilled in the art is by considering that disclosed in this specification, content also can obtain other embodiment.This specification and example only should be regarded as exemplary, and true scope of the present invention is by claims and equivalents.
Claims (10)
1., for assembling an assembly method for permanent magnet DC motor, this permanent magnet DC motor comprises the shell of metal tubular and the permanent magnet of tubular, and this assembly method comprises step:
A) described shell is heated to predetermined heating-up temperature;
B) described permanent magnet is pressed into described shell to predetermined installation site along the axis of described shell;
C) a period of time is incubated; And
D) cool described shell and permanent magnet, wherein, between described shell and described permanent magnet, form interference fit.
2. assembly method according to claim 1, is characterized in that, at the inwall coating anaerobic adhesive of described shell before a) step or while carrying out a) step.
3. assembly method according to claim 1 and 2, is characterized in that, described permanent magnet is made up of neodymium iron boron, and described shell is made up of plated steel sheet, and described predetermined heating-up temperature is 100 DEG C.
4. assembly method according to claim 3, is characterized in that, in c) step, temperature retention time is the several seconds, is preferably 2 seconds.
5. assembly method according to claim 4, is characterized in that, in b) step, the axis of described shell is vertical direction, and described permanent magnet is from top to bottom pressed in described shell.
6. assembly method according to claim 1 and 2, is characterized in that, described a) step comprises and heats described shell with the electrical heating wire be wrapped on the outer wall of described shell.
7. assembly method according to claim 6, is characterized in that, described electrical heating wire is wrapped in the region corresponding with the predetermined installation site of described permanent magnet on the outer wall of described shell.
8. assembly method according to claim 1 and 2, it is characterized in that, before a) step or carrying out a) while step or in a) step and b) between step, described shell is removably mounted on fixed pedestal, described permanent magnet is arranged on stationary fixture and aims at location relative to described shell.
9. assembly method according to claim 1 and 2, it is characterized in that, in b) step, by be arranged on the breach of one end of described permanent magnet or boss be arranged on described shell inwall relevant position boss or coordinating of breach guarantee the installation site of described permanent magnet in described shell.
10. a permanent magnet DC motor, comprises the shell of metal tubular and the permanent magnet of tubular, and wherein said permanent magnet is by installing in the housing according to the assembly method one of claim 1-9 Suo Shu.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310365612.6A CN104426303B (en) | 2013-08-21 | 2013-08-21 | The motor assembled for the assembly method of permanent magnet DC motor and by this method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310365612.6A CN104426303B (en) | 2013-08-21 | 2013-08-21 | The motor assembled for the assembly method of permanent magnet DC motor and by this method |
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| CN104426303A true CN104426303A (en) | 2015-03-18 |
| CN104426303B CN104426303B (en) | 2017-07-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106052990A (en) * | 2016-05-23 | 2016-10-26 | 脉创测控装备科技（苏州）有限公司 | New method of reducing vibrating table impedance |
| CN108000112A (en) * | 2018-01-16 | 2018-05-08 | 恒速控股有限公司 | A kind of motor assembling line and its stator press-loading transmission equipment |
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| CN103051115A (en) * | 2012-12-31 | 2013-04-17 | 广东超力微电机有限公司 | Assembling machine for micromotor stator assemblies |
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| US5874794A (en) * | 1995-07-28 | 1999-02-23 | Ryobi North America, Inc. | Method for securing magnets to a permanent magnet motor shell and a motor made therefrom |
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| CN108000112A (en) * | 2018-01-16 | 2018-05-08 | 恒速控股有限公司 | A kind of motor assembling line and its stator press-loading transmission equipment |
Also Published As
| Publication number | Publication date |
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| CN104426303B (en) | 2017-07-28 |
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