CN101572159A - High pressure resistant rotary electromagnet with low inertia - Google Patents
High pressure resistant rotary electromagnet with low inertia Download PDFInfo
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- CN101572159A CN101572159A CNA2009100959830A CN200910095983A CN101572159A CN 101572159 A CN101572159 A CN 101572159A CN A2009100959830 A CNA2009100959830 A CN A2009100959830A CN 200910095983 A CN200910095983 A CN 200910095983A CN 101572159 A CN101572159 A CN 101572159A
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Abstract
The invention relates to a high pressure resistant rotary electromagnet with low inertia, comprising a stator part, a rotor part, a front end cover and a rear end cover; wherein, the stator part comprises four stator cores, a first magnetism isolating ring, a second magnetism isolating ring, a first control coil, a second control coil and a permanent-magnet; the stator cores are distributed at the outer ring of the rotor in a shape of half opening, openings of the first and the second stator cores are corresponding to each other and form a first cavity, and the first magnetism isolating ring is positioned inside the first cavity; openings of the third and the fourth stator cores are corresponding to each other and form a second cavity, and the second magnetism isolating ring is positioned inside the second cavity; the permanent-magnet is positioned between the second stator core and the third stator core and is magnetized to be N and S poles along the axial direction; the outer circumference surface of the rotor are provided with rotor teeth having the number being the same as that of all the stator cores. The invention has good high pressure resistant property, and is suitable for working in a wet state.
Description
Technical field
The invention belongs to the electromechanical converter that electrohydraulic digital valve is used in fluid transmission and the control field, relate in particular to a kind of high pressure resistant rotary electromagnet with low inertia.
Background technology
Whether valve has fluid to enter can be divided into two kinds of dry type and wet types with electromechanical converter according to the armature working chamber, the latter compares with the former, can be immersed in the fluid when allowing armature work owing to its structural high pressure resistant property, thereby has good heat dissipation, it is little to rub, commutation and when resetting impact noise little, therefore the advantage that stable working and life-span are long is used increasingly extensive.
The composite stepper motor of conventional electrohydraulic digital valve electromechanical converter for controlling according to the AC servo mode, there is no the sealed high-voltage resistant structure between its control coil and the working rotor chamber, in a single day fluid enter working chamber, thereby control coil will directly be immersed in the damage that causes motor in the fluid, thereby can't work under the wet type state; In addition, the rotor of conventional composite stepper motor is overrided to form for the solid silicon steel disc, and its moment of inertia is big, response speed is slower, thereby limited the frequency range of valve down to whole electrohydraulic servo system, thereby for the use occasion that needs fast dynamic response, and inapplicable.
Summary of the invention
In order to overcome existing electrohydraulic digital valve, the invention provides a kind of high pressure resistant rotary electromagnet with low inertia that has good high pressure resistant property, adapts to work under the wet type state with the no sealed high-voltage resistant structure of electromechanical converter, the deficiency that can't under the wet type state, work.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of high pressure resistant rotary electromagnet with low inertia, comprise stator component, rotor part, front end housing and rear end cap, described stator component is positioned at the outside of rotor part, described rotor part comprises rotor and armature spindle, rotor is installed on the armature spindle, the two ends of described armature spindle are installed in respectively on front end housing and the rear end cap, described stator component comprises first stator core, second stator core, the 3rd stator core, the 4th stator core, first magnetism-isolating loop, second magnetism-isolating loop, first control coil, second control coil and permanent magnet, described first stator core, second stator core, the 3rd stator core, the 4th stator core all is the half opening shape, described first stator core, second stator core, the 3rd stator core, the 4th stator core is arranged in the rotor outer ring, the opening of described first stator core and second stator core is relative and form first cavity, first magnetism-isolating loop is positioned at described first cavity, and described first control coil is looped around a phase of forming current excitation on first magnetism-isolating loop; The opening of described the 3rd stator core and the 4th stator core is relative and form second cavity, and described second magnetism-isolating loop is positioned at described second cavity, and described second control coil is looped around another phase of forming current excitation on second magnetism-isolating loop; Described permanent magnet changes into the N utmost point and the S utmost point between described second stator core and the 3rd stator core and by axial magnetic; The inner peripheral surface of described first stator core, second stator core, the 3rd stator core, the 4th stator core all has equally distributed a plurality of little tooth, and the number of teeth of four stator cores is identical; 1/2 tooth pitch of the tooth of leading along clockwise direction second stator core of the tooth of described first stator core, the tooth of second stator core falls behind 1/4 tooth pitch of tooth of the 3rd stator core, 1/2 tooth pitch of the tooth of leading along clockwise direction the 4th stator core of the tooth of the 3rd stator core along clockwise direction; Have the rotor tooth identical on the outer circumference surface of described rotor with each stator core number of teeth; Described first magnetism-isolating loop and described first stator core, second stator core all are tightly connected; Described second magnetism-isolating loop and described the 3rd stator core, the 4th stator core all are tightly connected, and the sidewall of described first stator core and described front end housing are tightly connected, and the sidewall of described the 4th stator core and described rear end cap are tightly connected.
As preferred a kind of scheme, the inner face of described first magnetism-isolating loop has first annular groove and second annular groove, and the described first annular groove built-in ring also contacts with first stator core; The described second annular groove built-in ring also contacts with second stator core; The inner face of described second magnetism-isolating loop has the 3rd annular groove and Fourth Ring connected in star, and described the 3rd annular groove built-in ring also contacts with the 3rd stator core; Described Fourth Ring connected in star built-in ring also contacts with the 4th stator core; The sidewall of described second stator core has the five rings connected in star, the sidewall of described the 3rd stator core has the 6th annular groove, described five rings connected in star built-in ring also contacts with the sidewall of described permanent magnet, and described the 6th annular groove built-in ring also contacts with another sidewall of described permanent magnet; Described front end housing inwall has the 7th annular groove, the inwall of described rear end cap has the 8th annular groove, described the 7th annular groove built-in ring also contacts with described first stator core, and described the 8th annular groove built-in ring also contacts with described the 4th stator core.
Further, described rotor is the drag cup rotor.
Further again, described front end housing, rear end cap, first magnetism-isolating loop, second magnetism-isolating loop and armature spindle are the non-magnetizer that non-magnet_conductible material is made; Described first stator core, second stator core, the 3rd stator core, the 4th stator core and rotor are the magnetic conductor that soft magnetic material is made.
Described armature spindle is supported in front end housing and the rear end cap by two cover bearings.
Beneficial effect of the present invention mainly shows: 1, adopted simple and reliable high pressure resistant structure, the system that makes possesses the ability of working under the wet type state; 2, rotor moment of inertia is little, the frequency response height, and response speed is fast, and dynamic property is good; 3, commutate and impact when resetting and noise little, working stability; 4, the control coil temperature rise is low, and lifetime of system is long; 5, the friction of motion parts is little, and greasy property is good, helps keeping for a long time precision.
Description of drawings
Fig. 1 is a structural principle schematic diagram of the present invention.
Fig. 2 is a drag cup rotor structure schematic diagram of the present invention.
Fig. 3 a (1), 3b (1), 3c (1) and 3d (1) be Fig. 1 I-I to, II-II to, III-III to IV-IV to cutaway view, wherein:
Fig. 3 a (2) is the A portion enlarged drawing of Fig. 3 a (1);
Fig. 3 b (2) is the B portion enlarged drawing of Fig. 3 b (1);
Fig. 3 c (2) is the C portion enlarged drawing of Fig. 3 c (1);
Fig. 3 d (2) is the D portion enlarged drawing of Fig. 3 d (1).
Fig. 4 a, 4b, 4c, 4d and 4e are operation principle schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1～Fig. 4 e, a kind of high pressure resistant rotary electromagnet with low inertia, comprise stator component, rotor part, front end housing 1 and rear end cap 17, described stator component is positioned at the outside of rotor part, described rotor part comprises rotor and armature spindle, rotor is installed on the armature spindle 5, the two ends of described armature spindle 5 are installed in respectively on front end housing 1 and the rear end cap 17, described stator component comprises first stator core 6, second stator core 11, the 3rd stator core 14, the 4th stator core 15, first magnetism-isolating loop 7, second magnetism-isolating loop 21, first control coil 9, second control coil 20 and permanent magnet 23, described first stator core 6, second stator core 11, the 3rd stator core 14, the 4th stator core 15 all is the half opening shape, described first stator core 6, second stator core 11, the 3rd stator core 14, the 4th stator core 15 is arranged in the rotor outer ring, the opening of described first stator core 6 and second stator core 11 is relative and form first cavity, first magnetism-isolating loop 7 is positioned at described first cavity, and described first control coil 9 is looped around a phase of forming current excitation on first magnetism-isolating loop 7; The opening of described the 3rd stator core 14 and the 4th stator core 15 is relative and form second cavity, and described second magnetism-isolating loop 21 is positioned at described second cavity, and described second control coil 20 is looped around another phase of forming current excitation on second magnetism-isolating loop 21; Described permanent magnet 23 changes into the N utmost point and the S utmost point between described second stator core 11 and the 3rd stator core 14 and by axial magnetic; The inner peripheral surface of described first stator core 6, second stator core 11, the 3rd stator core 14, the 4th stator core 15 all has equally distributed a plurality of little tooth, and the number of teeth of four stator cores is identical; 1/2 tooth pitch of the tooth of leading along clockwise direction second stator core of the tooth of described first stator core, the tooth of second stator core falls behind 1/4 tooth pitch of tooth of the 3rd stator core, 1/2 tooth pitch of the tooth of leading along clockwise direction the 4th stator core of the tooth of the 3rd stator core along clockwise direction; Have the rotor tooth identical on the outer circumference surface of described rotor with each stator core number of teeth; Described first magnetism-isolating loop 7 all is tightly connected with described first stator core 6, second stator core 11; Described second magnetism-isolating loop 21 all is tightly connected with described the 3rd stator core 14, the 4th stator core 15, and the sidewall of described first stator core 6 and described front end housing 1 are tightly connected, and the sidewall of described the 4th stator core 15 and described rear end cap 17 are tightly connected.
Present embodiment is an example with the structure of 51 teeth that evenly distribute on the electromagnet rotor, and the invention will be further described in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2, the present invention includes first stator core 6, second stator core 11, the 3rd stator core 14, the 4th stator core 15, first magnetism-isolating loop 7, second magnetism-isolating loop 21, first control coil 9, second control coil 20, permanent magnet 23, drag cup rotor 3, armature spindle 5, front end housing 1, rear end cap 17 and sealing ring 2,8,10,12,13,16,19,22; The opening of first stator core 6 and second stator core 11 is relative and form first cavity, built-in first magnetism-isolating loop 7, first control coil 9 is looped around a phase of forming current excitation on first magnetism-isolating loop 7, the opening of the 3rd stator core 14 and the 4th stator core 15 is relative and form second cavity, built-in second magnetism-isolating loop 21, second control coil 20 is looped around another phase of forming current excitation on second magnetism-isolating loop 21, and permanent magnet 23 is placed on the centre of second stator core 11 and the 3rd stator core 14 and is changed into the N utmost point and S level by axial magnetic.
When fluid enters the working rotor chamber, the outside of second stator core 11 and the 3rd stator core 14 respectively has a cannelure and is used for placing sealing ring 12,13, the inboard of front end housing 1 and rear end cap 17 respectively has a cannelure and is used for placing sealing ring 2,16, leaks out the fit clearance of fluid between the electromagnet parts preventing; First magnetism-isolating loop 7, second magnetism-isolating loop, 21 endoporus respectively have the uniform cannelure in a pair of left and right sides, are used for placing sealing ring 8,10,22,19, make control coil 9,20 and to be full of the working rotor chamber of fluid isolated; Above-mentioned is high pressure resistant simple and reliable for structure, realize easily, thereby the system that makes has had the ability of working under the wet type state.
For reducing the moment of inertia of rotor, having designed drag cup rotor 3 matches with armature spindle 5, have a plurality of rotor tooths identical with the stator core number of teeth on its outer circumference surface, whole rotor part is supported in front end housing 1 and the rear end cap 17 by bearing 4,18, can rotate around central axis.
For satisfying the requirement of permanent magnetism polar flux and Current Control magnetic flux, front end housing 1, rear end cap 17, first magnetism-isolating loop 7, second magnetism-isolating loop 21 and armature spindle 5 are the non-magnetizer that non-magnet material is made, and first stator core 6, second stator core 11, the 3rd stator core 14, the 4th stator core 15 and drag cup rotor 3 are the good magnetic conductor that soft magnetic material is made; For strengthening heat radiation, reduce the temperature rise of first control coil 9, second control coil 20, the material of first magnetism-isolating loop 7, second magnetism-isolating loop 21 also should have good heat-conducting.
Shown in Fig. 3 a (1), 3a (2), 3b (1), 3b (2), 3c (1), 3c (2), 3d (1) and 3d (2), for realizing the continuous rotation of high pressure resistant rotary electromagnet with low inertia, 1/2 tooth pitch of the tooth of leading along clockwise direction second stator core of the tooth of described first stator core, the tooth of second stator core falls behind 1/4 tooth pitch of tooth of the 3rd stator core, 1/2 tooth pitch of the tooth of leading along clockwise direction the 4th stator core of the tooth of the 3rd stator core along clockwise direction.
Operation principle: shown in Fig. 4 a, first stator core 6, second stator core 11, the 3rd stator core 14, the 4th stator core 15 form the working gas gap δ of four sections annulars respectively with drag cup rotor 3
1, δ
2, δ
3And δ
4, be represented by dotted lines the polarizing magnetic field that permanent magnet produces among the figure, represent the magnetic field that Control current produces with solid line.In the time of second control coil 20, first control coil, 9 obstructed electric currents, working gas gap δ
1, δ
2, δ
3And δ
4In have only permanent magnet to produce polarizing magnetic field because each section stator side set respectively, thereby total magnetic conductance of whole permanent magnetic circuit has nothing to do with rotor-position, electromagnet does not produce torque; Make that the rotor-position shown in Fig. 4 a is an initial position, when second control coil 20, when first control coil 9 feeds the electric current of ⊙ direction (outside along paper) shown in Fig. 4 b, Current Control magnetic field and permanent-magnet pole magnetizing field are at working gas gap δ
1, δ
2, δ
3And δ
4Middle mutual superposition, wherein working gas gap δ
1And δ
4Following controlling magnetic field is identical with permanent-magnet pole magnetizing field direction, and magnetic field intensity strengthens; Working gas gap δ
2And δ
3Following current field is opposite with permanent-magnet pole magnetizing field direction, and magnetic field intensity weakens, and drag cup rotor 3 was subjected to clockwise moment and turned over 1/4 rotor slot-pitch and be in the position shown in Fig. 4 b this moment; When second control coil 20 feeds
When the electric current of direction (along paper inwards) and the sense of current of first control coil 9 are constant, working gas gap δ
1And δ
3Following magnetic field intensity strengthens; Working gas gap δ
2And δ
4Following magnetic field intensity weakens, and drag cup rotor 3 continued to be subjected to clockwise moment and turned over 1/4 rotor slot-pitch and be in the position shown in Fig. 4 c this moment; With should second control coil 20 and first control coil 9 all feed
During the electric current of direction, working gas gap δ
2And δ
3Following electromagnetic field intensity strengthens, working gas gap δ
1And δ
4Following magnetic field intensity weakens, and drag cup rotor 3 was subjected to clockwise moment and turned over 1/4 rotor slot-pitch again and be in the position shown in Fig. 4 d this moment; When second control coil 20 feeds the ⊙ directional current and 9 feedings of first control coil
During directional current, working gas gap δ
2And δ
4Following electromagnetic field intensity strengthens, working gas gap δ
1And δ
3Following magnetic field intensity weakens, and drag cup rotor 3 turns over 1/4 rotor slot-pitch more clockwise and is in the position shown in Fig. 4 e at this moment.Can see that under the differential stack of Current Control magnetic field and permanent-magnet pole magnetizing field, every through four kinds of step modes variations, rotor will turn over an angular pitch.Repeat above-mentioned step mode, rotor will rotate continuously with the step pitch clockwise direction of 1/4 rotor slot-pitch; Change step mode, also can realize the counter clockwise direction motion of rotor.
Above-mentioned embodiment is used for explaining the present invention, rather than limits the invention, and in the protection range of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.
Claims (5)
1, a kind of high pressure resistant rotary electromagnet with low inertia, comprise stator component, rotor part, front end housing and rear end cap, described stator component is positioned at the outside of rotor part, described rotor part comprises rotor and armature spindle, rotor is installed on the armature spindle, the two ends of described armature spindle are installed in respectively on front end housing and the rear end cap, it is characterized in that: described stator component comprises first stator core, second stator core, the 3rd stator core, the 4th stator core, first magnetism-isolating loop, second magnetism-isolating loop, first control coil, second control coil and permanent magnet, described first stator core, second stator core, the 3rd stator core, the 4th stator core all is the half opening shape, described first stator core, second stator core, the 3rd stator core, the 4th stator core is arranged in the rotor outer ring, the opening of described first stator core and second stator core is relative and form first cavity, first magnetism-isolating loop is positioned at described first cavity, and described first control coil is looped around a phase of forming current excitation on first magnetism-isolating loop; The opening of described the 3rd stator core and the 4th stator core is relative and form second cavity, and described second magnetism-isolating loop is positioned at described second cavity, and described second control coil is looped around another phase of forming current excitation on second magnetism-isolating loop; Described permanent magnet changes into the N utmost point and the S utmost point between described second stator core and the 3rd stator core and by axial magnetic; The inner peripheral surface of described first stator core, second stator core, the 3rd stator core, the 4th stator core all has equally distributed a plurality of little tooth, and the number of teeth of four stator cores is identical; 1/2 tooth pitch of the tooth of leading along clockwise direction second stator core of the tooth of described first stator core, the tooth of second stator core falls behind 1/4 tooth pitch of tooth of the 3rd stator core, 1/2 tooth pitch of the tooth of leading along clockwise direction the 4th stator core of the tooth of the 3rd stator core along clockwise direction; Have the rotor tooth identical on the outer circumference surface of described rotor with each stator core number of teeth;
Described first magnetism-isolating loop and described first stator core, second stator core all are tightly connected; Described second magnetism-isolating loop and described the 3rd stator core, the 4th stator core all are tightly connected, and the sidewall of described first stator core and described front end housing are tightly connected, and the sidewall of described the 4th stator core and described rear end cap are tightly connected.
2, high pressure resistant rotary electromagnet with low inertia as claimed in claim 1 is characterized in that: the inner face of described first magnetism-isolating loop has first annular groove and second annular groove, and the described first annular groove built-in ring also contacts with first stator core; The described second annular groove built-in ring also contacts with second stator core; The inner face of described second magnetism-isolating loop has the 3rd annular groove and Fourth Ring connected in star, and described the 3rd annular groove built-in ring also contacts with the 3rd stator core; Described Fourth Ring connected in star built-in ring also contacts with the 4th stator core; The sidewall of described second stator core has the five rings connected in star, the sidewall of described the 3rd stator core has the 6th annular groove, described five rings connected in star built-in ring also contacts with the sidewall of described permanent magnet, and described the 6th annular groove built-in ring also contacts with another sidewall of described permanent magnet; Described front end housing inwall has the 7th annular groove, the inwall of described rear end cap has the 8th annular groove, described the 7th annular groove built-in ring also contacts with described first stator core, and described the 8th annular groove built-in ring also contacts with described the 4th stator core.
3, high pressure resistant rotary electromagnet with low inertia as claimed in claim 1 or 2 is characterized in that: described rotor is the drag cup rotor.
4, high pressure resistant rotary electromagnet with low inertia as claimed in claim 3 is characterized in that: described front end housing, rear end cap, first magnetism-isolating loop, second magnetism-isolating loop and armature spindle are the non-magnetizer that non-magnet_conductible material is made; Described first stator core, second stator core, the 3rd stator core, the 4th stator core and rotor are the magnetic conductor that soft magnetic material is made.
5, high pressure resistant rotary electromagnet with low inertia as claimed in claim 3 is characterized in that: described armature spindle is supported in front end housing and the rear end cap by two cover bearings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100959830A CN101572159B (en) | 2009-02-26 | 2009-02-26 | High pressure resistant rotary electromagnet with low inertia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100959830A CN101572159B (en) | 2009-02-26 | 2009-02-26 | High pressure resistant rotary electromagnet with low inertia |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101572159A true CN101572159A (en) | 2009-11-04 |
| CN101572159B CN101572159B (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100959830A Expired - Fee Related CN101572159B (en) | 2009-02-26 | 2009-02-26 | High pressure resistant rotary electromagnet with low inertia |
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| CN101800112A (en) * | 2010-03-31 | 2010-08-11 | 浙江工业大学 | High-voltage resistant bidirectional rotary high-speed switch electromagnet |
| CN102142757A (en) * | 2011-03-09 | 2011-08-03 | 浙江工业大学 | Sheet-inserting type rotary electromagnet |
| CN102878135A (en) * | 2012-09-18 | 2013-01-16 | 浙江工业大学 | Direct acting 2D electric-hydraulic proportional digital valve |
| CN103378705A (en) * | 2012-04-25 | 2013-10-30 | 刘羿辰 | Electromagnetic actuating converter capable of being adjusted according to performance matching |
| CN105375660A (en) * | 2015-11-16 | 2016-03-02 | 浙江工业大学之江学院 | Wet-type high-voltage resistant rotation electromagnet with symmetric dual-magnetic steel magnetic paths |
| CN105375658A (en) * | 2015-11-16 | 2016-03-02 | 浙江工业大学 | Wet high-speed rotating motor with double-toothed stator and rotor |
| CN106160282A (en) * | 2016-08-28 | 2016-11-23 | 浙江工业大学 | Wet type high-speed electric expreess locomotive with helical form teeth groove |
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| CN201374638Y (en) * | 2009-02-26 | 2009-12-30 | 浙江工业大学 | High-voltage-resistant low-inertia rotary electromagnet |
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| CN101800112B (en) * | 2010-03-31 | 2012-06-27 | 浙江工业大学 | High-voltage resistant bidirectional rotary high-speed switch electromagnet |
| CN101800112A (en) * | 2010-03-31 | 2010-08-11 | 浙江工业大学 | High-voltage resistant bidirectional rotary high-speed switch electromagnet |
| CN102142757A (en) * | 2011-03-09 | 2011-08-03 | 浙江工业大学 | Sheet-inserting type rotary electromagnet |
| CN102142757B (en) * | 2011-03-09 | 2012-12-12 | 浙江工业大学 | Sheet-inserting type rotary electromagnet |
| CN103378705A (en) * | 2012-04-25 | 2013-10-30 | 刘羿辰 | Electromagnetic actuating converter capable of being adjusted according to performance matching |
| CN103378705B (en) * | 2012-04-25 | 2016-09-28 | 刘羿辰 | Electromagnetic actuating converter capable of being adjusted according to performance matching |
| CN102878135A (en) * | 2012-09-18 | 2013-01-16 | 浙江工业大学 | Direct acting 2D electric-hydraulic proportional digital valve |
| CN105375660A (en) * | 2015-11-16 | 2016-03-02 | 浙江工业大学之江学院 | Wet-type high-voltage resistant rotation electromagnet with symmetric dual-magnetic steel magnetic paths |
| CN105375658A (en) * | 2015-11-16 | 2016-03-02 | 浙江工业大学 | Wet high-speed rotating motor with double-toothed stator and rotor |
| CN105375660B (en) * | 2015-11-16 | 2017-12-05 | 浙江工业大学之江学院 | A kind of high pressure resistant rotary magnet of double symmetrical wet types of Alnico magnetic circuit |
| CN106160282B (en) * | 2016-08-28 | 2019-01-08 | 浙江工业大学 | Wet type high-speed motor with helical form tooth socket |
| CN106160282A (en) * | 2016-08-28 | 2016-11-23 | 浙江工业大学 | Wet type high-speed electric expreess locomotive with helical form teeth groove |
| CN106788611A (en) * | 2016-12-05 | 2017-05-31 | 上海航天控制技术研究所 | A kind of rotation communicator based on magnetic coupling |
| CN106788611B (en) * | 2016-12-05 | 2020-11-10 | 上海航天控制技术研究所 | Rotary communication device based on magnetic field coupling |
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| CN111542901B (en) * | 2017-12-19 | 2022-02-01 | 亚萨合莱有限公司 | Actuator comprising a soft-magnetic body and method |
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| CN111670341B (en) * | 2019-01-09 | 2022-07-15 | 深圳市大疆创新科技有限公司 | Driver, scanning module and laser measuring device |
| CN110880850A (en) * | 2019-11-11 | 2020-03-13 | 华中科技大学 | Stator permanent magnet type moving iron core type spring-free linear oscillation motor |
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