CN104425096A - Magnetizing apparatus and magnetizing method - Google Patents

Magnetizing apparatus and magnetizing method Download PDF

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Publication number
CN104425096A
CN104425096A CN201410362364.4A CN201410362364A CN104425096A CN 104425096 A CN104425096 A CN 104425096A CN 201410362364 A CN201410362364 A CN 201410362364A CN 104425096 A CN104425096 A CN 104425096A
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China
Prior art keywords
magnetized
magnetite
magnetizer
coil
accommodation space
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CN201410362364.4A
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Chinese (zh)
Inventor
简铭宏
刘育达
黄广淼
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Metal Industries Research and Development Centre
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Metal Industries Research and Development Centre
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Publication of CN104425096A publication Critical patent/CN104425096A/en
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Abstract

A magnetizing device and a magnetizing method are provided, the magnetizing method comprises the following steps: providing a magnetic roller, the magnetic roller comprising: the magnetic iron core comprises an axis and a plurality of magnets to be magnetized, wherein the magnets to be magnetized are fixedly arranged on the axis; placing the magnets to be magnetized of the magnetic roller in a plurality of accommodating spaces surrounded by a coil, wherein the accommodating spaces correspond to the magnets to be magnetized; the coil is electrified, and meanwhile, a forward magnetic field is generated by part of the accommodating spaces and a reverse magnetic field is generated by the other part of the accommodating spaces. The invention also provides a magnetizing device which is used for magnetizing the magnetic roller. Compared with the prior art of the process of magnetizing and then assembling, the invention can avoid the problems of magnet fragmentation and inaccurate placement position caused by over-strong attraction force.

Description

Magnetizing equipment and magnetization method
Technical field
The present invention relates to a kind of magnetizing equipment and magnetization method, particularly a kind ofly carry out the magnetizing equipment that magnetizes and magnetization method for magnetic rollers.
Background technology
Magnetic rollers can be used for the cutting fluid or the lubricating fluid water that purify machining or transmission, machining board or transmission board is increased the service life and transmission quality have higher stability and precision, improves the utilization rate of cutting fluid by this.
As shown in Figure 1, rate is re-used in order to what improve this cutting fluid, generally that the cutting fluid with borings 901 (this borings 901 is the ferromagnetic material of tool) is imported a filter 910, to carry out the detached job of this cutting fluid and borings 901.This filter 910 comprises arrival end 911, magnetic rollers 912, liquid outlet end 913 and a chip port of export 914, this magnetic rollers 912 comprises an axle center 912a, this axle center 912a is fixedly arranged between liquid outlet end 913 and the chip port of export 914, this axle center 912a is provided with multiple magnetite 912b near the side of this liquid outlet end 913, this magnetic rollers 912 separately comprises the outer peripheral face that an outer tube 912c is sheathed on this axle center 912a and multiple magnetite 912b, and this outer tube 912c can rotate relative to this axle center 912a and multiple magnetite 912b.
After entering the arrival end 911 of this filter 910 with the cutting fluid of multiple borings 901, the plurality of borings 901 can be adsorbed on the side that this outer tube 912c has magnetite 912b relatively, flow to this liquid outlet end 913 to avoid the plurality of borings 901 along with cutting fluid.Because the axle center 912a near the chip port of export 914 does not arrange magnetite 912b, therefore when the plurality of borings 901 rotates to this chip port of export 914 along with outer tube 912c, the plurality of borings 901 can be made to fall to this chip port of export 914, to complete the detached job of cutting fluid and borings 901 because magnetic attraction disappears.
During current manufacture magnetic rollers, first distinctly can be magnetized by multiple magnetite, and then magnetite is attached at the outer surface in axle center, to form magnetic rollers, this is the technique of assembling afterwards that first magnetizes.But when magnetite is attached at the outer surface in axle center, magnetic force and the magnetic force between magnetite and axle center between two magnetites, difficulty when magnetite all can be caused to be attached at axle center.
Therefore, just have and need to provide a kind of magnetizer for magnetic rollers, to solve aforesaid problem.
Summary of the invention
The object of the present invention is to provide a kind of magnetizing equipment that magnetic rollers is magnetized and method, to solve aforesaid problem.
For reaching above-mentioned purpose, the invention provides a kind of magnetizing equipment, in order to magnetize to a magnetic rollers, this magnetic rollers comprises an axle center and multiple magnetite to be magnetized, those magnetites to be magnetized are installed on this axle center, this magnetizing equipment comprises one first magnetizer and one second magnetizer, arrangement those magnetites to be magnetized corresponding of this first magnetizer and this second magnetizer, in order to magnetize to those magnetites to be magnetized simultaneously, this first magnetizer and this second magnetizer comprise respectively: a housing, its inside has an accommodation space, in order to place this magnetite to be magnetized arbitrary of this magnetic rollers, to magnetize to this magnetite to be magnetized, and a coil, around this accommodation space, wherein this coil of this first magnetizer and this coil of this second magnetizer are same circuit.
For reaching above-mentioned purpose, the present invention reoffers a kind of magnetization method, comprise the following steps: to provide a magnetic rollers, this magnetic rollers comprises: an axle center and one first magnetite to be magnetized and one second magnetite to be magnetized, and this first magnetite to be magnetized and this second magnetite to be magnetized are installed on this axle center; Place this first magnetite to be magnetized of this magnetic rollers in the accommodation space being surrounded with a coil; And this coil is forward energized, make generation one forward magnetic field in this accommodation space.
For reaching above-mentioned purpose, the present invention provides again a kind of magnetization method, and comprise the following steps: to provide a magnetic rollers, this magnetic rollers comprises: an axle center and multiple magnetite to be magnetized, and those magnetites to be magnetized are installed on this axle center; Place those magnetites to be magnetized of this magnetic rollers in the multiple accommodation spaces being surrounded with a coil, and those accommodation spaces those magnetites to be magnetized corresponding; Be energized to this coil, those accommodation spaces simultaneously making those accommodation spaces of part produce forward magnetic field and an another part produce an opposing magnetic field.
Magnetic rollers described in the present invention is applicable to first assemble the technique magnetized afterwards, those magnetites of this magnetic rollers are first installed in the outer surface in the axle center of this magnetic rollers, and then the magnetite of magnetic rollers is placed on be surrounded with coil accommodation space in magnetize.When coil produces magnetic field, the magnetic density in accommodation space is maximum and evenly, the efficiency therefore magnetized can be higher.The magnetization method of the first embodiment of the present invention only need control sense of current, just can control magnetite magnetize after magnetic direction.The magnetization method of the second embodiment of the present invention uses magnetizer of the present invention, because once magnetizing to multiple magnetite to be magnetized, and magnetizing the time of the roller that can deperm.Compared to the technique of assembling afterwards that first magnetizes of prior art, the present invention can avoid magnetite to cause excessively by force the cracked problem coarse with placement location of magnetite because of suction.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Accompanying drawing explanation
Fig. 1 is the cutaway view of the use situation of existing magnetic rollers;
Fig. 2 is the stereogram of magnetic rollers;
Fig. 3 is the cutaway view of magnetic rollers;
Fig. 4 is single magnetizer stereogram;
Fig. 5 and Fig. 6 is that the to be magnetized magnetite of single magnetizer to magnetic rollers magnetizes the cutaway view of action;
Fig. 7 is the magnetization method flow chart of the first embodiment of the present invention;
Fig. 8 is the magnetizing equipment stereogram of one embodiment of the invention;
Fig. 9 is that the to be magnetized magnetite of magnetizing equipment of the present invention to magnetic rollers magnetizes the cutaway view of action;
Figure 10 is the magnetization method flow chart of the second embodiment of the present invention.
Wherein, Reference numeral
100 magnetizer 110 housings
112 accommodation space 114 surfaces
120 coil 130 power-supply controller of electric
140 forward opposing magnetic fields, magnetic field 150
200 magnetizing equipment 210 magnetizers
211 first magnetizer 212 second magnetizers
220 housing 230 coils
231 coil 232 coils
240 accommodation space 241 accommodation spaces
242 accommodation space 250 power-supply controller of electric
800 magnetic rollers 810 axle center
812 surperficial 814 magnetic sections
816 without magnetic region section 820 magnetite to be magnetized
821 first magnetite 822 second to be magnetized magnetite to be magnetized
830 balance weight 901 borings
910 filter 911 arrival ends
912 magnetic rollers 912a axle center
912b magnetite 912c outer tube
The 913 liquid outlet end 914 chip ports of export
The L longitudinal axis
S100 ~ S112 step
S200 ~ S206 step
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present invention and operation principle are described in detail:
Fig. 2 is the stereogram of magnetic rollers.Fig. 3 is the cutaway view of magnetic rollers.This magnetic rollers 800 comprises: an axle center 810 and multiple magnetite to be magnetized 820.This axle center 810 has a longitudinal axis L and a surface 812, and this surface 812 is around this longitudinal axis L.There is a magnetic section 814 and on this surface 812 without magnetic region section 816 along the circumferencial direction definition of this longitudinal axis L.Those magnetites 820 to be magnetized are installed in the surface 812 in this axle center 810, and position is at this magnetic section 814.Those magnetites 820 to be magnetized arrange in the mode of matrix.One balance weight 830 is installed in the outer surface 812 in this axle center 810, and position at this without magnetic region section 816.
Fig. 4 is single magnetizer stereogram.Fig. 5 is that the to be magnetized magnetite of single magnetizer to magnetic rollers magnetizes the phantom of action.This magnetizer 100 is in order to magnetize to magnetic rollers 800 (as Fig. 1).This magnetizer 100 comprises: housing 110 and a coil 120.The inside of this housing 110 has an accommodation space 112, in order to place this magnetite 820 to be magnetized arbitrary of this magnetic rollers 800.Preferably, the shape of corresponding this magnetite 820 to be magnetized arbitrary of shape of this accommodation space 112, makes this magnetite 820 to be magnetized fill up substantially in this accommodation space 112.This coil 120 is set in the surface 114 of this housing 110, and around this accommodation space 112.What should be specified is, " filling up " that the present embodiment is sayed refers to that the shape of magnetite 820 to be magnetized, size are corresponding with accommodation space 112, when being positioned in accommodation space 112 wait the magnetite 820 that magnetizes, this accommodation space 112 can be filled up, for magnetite 820 to be magnetized being inserted accommodation space 112 and take out from accommodation space 112, between magnetite 820 to be magnetized and this accommodation space 112, still have gap.
The power supply of this magnetizer 100 can utilize a power-supply controller of electric 130 to provide.This power-supply controller of electric 130 is electrically connected this coil 120, in order to provide a forward current or a reverse current to this coil 120.Forward current in above-mentioned and reverse current, its difference is that the direction that electric current flows in coil 120 is rightabout.When coil 120 is by forward current, forward magnetic field 140 (as shown in Figure 5) can be produced in accommodation space 112.When coil 120 is by reverse current, opposing magnetic field 150 (as shown in Figure 6) can be produced in accommodation space 112.The magnetic direction of this forward magnetic field 140 and this opposing magnetic field 150 is rightabout.
Fig. 7 is the magnetization method flow chart of the first embodiment of the present invention.This magnetization method comprises the following steps:
Step S100: magnetic rollers is provided.In this step, the magnetic rollers 800 that illustrates for Fig. 1 of this magnetic rollers.Those magnetites 820 to be magnetized have been installed in the surface 812 in this axle center 810.Those magnetites 820 to be magnetized comprise the first magnetite 821 to be magnetized and one second magnetite 822 to be magnetized.
Step S102: place the first magnetite to be magnetized of magnetic rollers in the accommodation space being surrounded with coil.In this step, as shown in Figure 5, this first magnetite 821 to be magnetized of this magnetic rollers 800 is contained in the accommodation space 112 of this magnetizer 100.
The shape of shape correspondence first magnetite 821 to be magnetized of accommodation space 112, therefore when first of magnetic rollers 800 is positioned in accommodation space 112 wait the magnetite 821 that magnetizes, the first magnetite 821 to be magnetized fills up in this accommodation space 112.
Step S104: coil is forward energized.In this step, as shown in Figures 4 and 5, start this power-supply controller of electric 130, and set this power-supply controller of electric 130 and produce forward current.When forward current enters this coil 120, meeting generation one forward magnetic field 140 simultaneously in the accommodation space 112 of this housing 110.When first after the magnetite 821 that magnetizes is subject to the impact in forward magnetic field 140, will start to magnetize.
Step S106: stop being energized to coil.In this step, as shown in Figures 4 and 5, after the intensity that the magnetic force of the magnetite 821 that magnetizes reaches predetermined, form the first magnetite when first, then close this power-supply controller of electric 130, then this first magnetite is left this accommodation space 112.
Step S108: place the second magnetite to be magnetized of magnetic rollers in accommodation space.In this step, as shown in Fig. 4 and Fig. 6, the second magnetite 822 to be magnetized is aimed at this accommodation space 112, then the second magnetite 822 to be magnetized is placed in this accommodation space 112.
Step S110: coil is oppositely energized.In this step, as shown in Fig. 4 and Fig. 6, start this power-supply controller of electric 130, and set this power-supply controller of electric 130 and produce reverse current.When reverse current enters this coil 120, in the accommodation space 112 of this housing 110, an opposing magnetic field 150 can be produced simultaneously.When second after the magnetite 822 that magnetizes is subject to the impact of opposing magnetic field 150, will start to magnetize.
Step S112: stop being energized to coil.In this step, as shown in Fig. 4 and Fig. 6, after the intensity that the magnetic force of the magnetite 822 that magnetizes reaches predetermined, form the second magnetite when second, then close this power-supply controller of electric 130, then this second magnetite is left this accommodation space 112.
By that analogy, sequentially other magnetites 820 to be magnetized are magnetized.
Fig. 8 is the magnetizing equipment stereogram of one embodiment of the invention.Fig. 9 is that the to be magnetized magnetite of those magnetizers to magnetic rollers magnetizes the phantom of action.This magnetizing equipment is in order to magnetize to a magnetic rollers.This magnetic rollers is the magnetic rollers 800 shown in Fig. 2.This magnetizing equipment 200 comprises multiple magnetizer 210, and for convenience of description, those magnetizers 210 comprise one first magnetizer 211 and one second magnetizer 212 to be described.Arrangement mode those magnetites 820 to be magnetized corresponding of this first magnetizer 211 and this second magnetizer 212.This first magnetizer 211 and this second magnetizer 212 comprise respectively: housing 220 and a coil 230.This housing 220 inside has an accommodation space 240, in order to place this magnetite 820 to be magnetized arbitrary of this magnetic rollers 800, to magnetize to this magnetite 820 to be magnetized.This coil 230 is set in the surface of this housing 220, and around this accommodation space 240.This coil 231 of this first magnetizer 211 can be same circuit with this coil 232 of this second magnetizer 212.In embodiments of the present invention, can by six magnetizers 210 with 3 × 2 mode arrange, and the coil 230 of those magnetizers 210 can by same circuit around forming.This first magnetizer 211 this second magnetizer 212 adjacent, and this coil 231 of this first magnetizer 211 is contrary around the direction of winding of this accommodation space 242 with this coil 232 of this second magnetizer 212 around the direction of winding of this accommodation space 241.
This magnetizing equipment also comprises a power-supply controller of electric 250.This power-supply controller of electric 250 is electrically connected this coil 230 of those magnetizers 210, in order to provide an electric current to this coil 230.When this coil 230 inflow current of those magnetizers 210, because this first magnetizer 211 is rightabout with the direction of winding of the coil 231,232 of this second magnetizer 212, the magnetic direction of this first magnetizer 211 is contrary direction with the magnetic direction of this second magnetizer 212.
The material of this housing 220 can be metal, preferably, the material of this housing 220 is non-magnet_conductible material, as non-magnetic stainless steel, in order to after power-supply controller of electric 250 pairs of coils 230 are energized, can produce higher magnetic field of effectively magnetizing, magnetite is filled the full current needs closed low, the heat therefore produced is also lower.
Figure 10 is the magnetization method flow chart of the second embodiment of the present invention.Please refer to Fig. 8 and Fig. 9, this magnetization method comprises the following steps:
Step S200: magnetic rollers is provided.In this step, the magnetic rollers 800 that illustrates for Fig. 2 of this magnetic rollers.Those magnetites 820 to be magnetized comprise the first magnetite 821 to be magnetized and one second magnetite 822 to be magnetized.
Step S202: place those magnetites to be magnetized of magnetic rollers in the multiple accommodation spaces being surrounded with a coil, and those accommodation spaces those magnetites to be magnetized corresponding.In this step, this first magnetite 821 to be magnetized of this magnetic rollers 800 is contained in this accommodation space 241 of the first magnetizer 231, and this second magnetite 822 to be magnetized is contained in this accommodation space 242 of the second magnetizer 212.The shape of shape correspondence first magnetite 821 to be magnetized of this accommodation space 241 of this first magnetizer 211, the shape of shape correspondence second magnetite 821 to be magnetized of this accommodation space 242 of this second magnetizer 212.When first and second of magnetic rollers 800 is in the accommodation space 241,242 that the magnetite 821,822 that magnetizes is positioned over this first and second magnetizer 211,212 respectively, first and second magnetite 821,822 to be magnetized fills up respectively in this accommodation space 241,242 of this first and second magnetizer 211,212.Will be understood that, " filling up " that the present embodiment is sayed refers to that the shape of magnetite 820 to be magnetized, size are corresponding with accommodation space 240, when to be positioned in accommodation space 240 wait the magnetite 820 that magnetizes, this accommodation space 240 can be filled up, only for magnetite 820 to be magnetized can be inserted accommodation space 240 and to take out from accommodation space 240, between magnetite 820 to be magnetized and this accommodation space 240, still have gap.
Step S204: be energized to coil, those accommodation spaces simultaneously making those accommodation spaces of part produce forward magnetic field and an another part produce an opposing magnetic field.In this step, start this power-supply controller of electric 250, when electric current enters this coil 230, in those accommodation spaces 240, a magnetic field can be produced simultaneously.This coil 231 of this first magnetizer 211 is contrary around the direction of winding of this accommodation space 242 with this coil 232 of the second magnetizer 212 around the direction of winding of this accommodation space 241, and the magnetic direction in the magnetic direction in this accommodation space 242 of therefore this first magnetizer 211 and this accommodation space 242 of this second magnetizer 212 is rightabout.Such as, the magnetic field in this accommodation space 241 of this first magnetizer 211 be forward magnetic field 261 time, the magnetic field in this accommodation space 242 of this second magnetizer 212 is just opposing magnetic field 262.The magnetic direction of this forward magnetic field 261 and this opposing magnetic field 262 is rightabout.
Step S206: stop being energized to coil.In this step, when forming first and second magnetite after the intensity that first and second magnetic force wait the magnetite 821,822 that magnetizes reaches predetermined, close this power-supply controller of electric 250, then by this first and two magnetite leave this accommodation space 240.
Afterwards, then for other magnetite to be magnetized 820, step S202 ~ S206 is repeated, to magnetize.
Magnetic rollers described in the present invention is applicable to first assemble the technique magnetized afterwards, those magnetites of this magnetic rollers are first installed in the outer surface in the axle center of this magnetic rollers, and then the magnetite of magnetic rollers is placed on be surrounded with coil accommodation space in magnetize.When coil produces magnetic field, the magnetic density in accommodation space is maximum and evenly, the efficiency therefore magnetized can be higher.The magnetization method of the first embodiment of the present invention only need control sense of current, just can control magnetite magnetize after magnetic direction.The magnetization method of the second embodiment of the present invention uses magnetizer of the present invention, because once magnetizing to multiple magnetite to be magnetized, and magnetizing the time of the roller that can deperm.Compared to the technique of assembling afterwards that first magnetizes of prior art, the present invention can avoid magnetite to cause excessively by force the cracked problem coarse with placement location of magnetite because of suction.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.

Claims (10)

1. a magnetizing equipment, in order to magnetize to a magnetic rollers, this magnetic rollers comprises an axle center and multiple magnetite to be magnetized, those magnetites to be magnetized are installed on this axle center, this magnetizing equipment comprises one first magnetizer and one second magnetizer, and arrangement those magnetites to be magnetized corresponding of this first magnetizer and this second magnetizer, in order to magnetize to those magnetites to be magnetized simultaneously, it is characterized in that, this first magnetizer and this second magnetizer comprise respectively:
One housing, its inside has an accommodation space, in order to place this magnetite to be magnetized arbitrary of this magnetic rollers, to magnetize to this magnetite to be magnetized; And
One coil, around this accommodation space;
Wherein this coil of this first magnetizer and this coil of this second magnetizer are same circuit.
2. magnetizing equipment according to claim 1, is characterized in that, the material of this housing of this first and second magnetizer is metal.
3. magnetizing equipment according to claim 1, is characterized in that, the material of this housing of this first and second magnetizer is non-magnet_conductible material.
4. magnetizing equipment according to claim 1, is characterized in that, this magnetite to be magnetized arbitrary fills up in this accommodation space of this first or second magnetizer.
5. magnetizing equipment according to claim 1, is characterized in that, more comprises a power-supply controller of electric, is electrically connected this coil of those magnetizers, in order to provide an electric current to this coil.
6. magnetizing equipment according to claim 1, it is characterized in that, this first magnetizer this second magnetizer adjacent, and the direction of winding of this this accommodation space of coil encircling of this first magnetizer is contrary with the direction of winding of this this accommodation space of coil encircling of the second magnetizer.
7. a magnetization method, is characterized in that, comprises the following steps:
There is provided a magnetic rollers, this magnetic rollers comprises: an axle center, one first magnetite to be magnetized and one second magnetite to be magnetized, and this first magnetite to be magnetized and this second magnetite to be magnetized are installed on this axle center;
Place this first magnetite to be magnetized of this magnetic rollers in the accommodation space being surrounded with a coil; And
This coil is forward energized, makes generation one forward magnetic field in this accommodation space.
8. magnetization method according to claim 7, is characterized in that, more comprises the following steps:
Stop being energized to this coil;
Place this second magnetite to be magnetized of this magnetic rollers in this accommodation space; And
This coil is oppositely energized, makes to produce an opposing magnetic field in this accommodation space.
9. magnetization method according to claim 8, is characterized in that, the magnetic direction of this forward magnetic field and this opposing magnetic field is rightabout.
10. a magnetization method, is characterized in that, comprises the following steps:
There is provided a magnetic rollers, this magnetic rollers comprises: an axle center and multiple magnetite to be magnetized, and those magnetites to be magnetized are installed on this axle center;
Place those magnetites to be magnetized of this magnetic rollers in the multiple accommodation spaces being surrounded with a coil, and those accommodation spaces those magnetites to be magnetized corresponding; And
Be energized to this coil, those accommodation spaces simultaneously making those accommodation spaces of part produce forward magnetic field and an another part produce an opposing magnetic field.
CN201410362364.4A 2013-09-06 2014-07-28 Magnetizing apparatus and magnetizing method Pending CN104425096A (en)

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TW102132293 2013-09-06
TW102132293A TWI501263B (en) 2013-09-06 2013-09-06 Magnetizing equipment and magnetizing method

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109195079A (en) * 2018-08-14 2019-01-11 歌尔股份有限公司 The assemble method and magnetic charging system of magnetic circuit system
CN110189884A (en) * 2019-06-04 2019-08-30 浙江英洛华磁业有限公司 A kind of small pole span multipole magnetization method of plane
CN110998763A (en) * 2017-08-11 2020-04-10 菲尼克斯电气公司 Method for magnetizing at least two magnets of different magnetic coercive field strengths

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US11302689B1 (en) * 2021-01-13 2022-04-12 Hong Kong Applied Science and Technology Research Institute Company Limited Transistor-injected silicon-controlled rectifier (SCR) with perpendicular trigger and discharge paths

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US7057323B2 (en) * 2003-03-27 2006-06-06 Emerson Electric Co. Modular flux controllable permanent magnet dynamoelectric machine

Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN110998763A (en) * 2017-08-11 2020-04-10 菲尼克斯电气公司 Method for magnetizing at least two magnets of different magnetic coercive field strengths
CN109195079A (en) * 2018-08-14 2019-01-11 歌尔股份有限公司 The assemble method and magnetic charging system of magnetic circuit system
CN109195079B (en) * 2018-08-14 2020-11-20 歌尔股份有限公司 Magnetic circuit system assembling method and magnetizing system
CN110189884A (en) * 2019-06-04 2019-08-30 浙江英洛华磁业有限公司 A kind of small pole span multipole magnetization method of plane

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Application publication date: 20150318