CN101527492B

CN101527492B - High-voltage and low-inertia direct-acting electro-mechanical converter

Info

Publication number: CN101527492B
Application number: CN2009100970933A
Authority: CN
Inventors: 孟彬; 阮健; 邢彤; 鲁立中
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2009-04-01
Filing date: 2009-04-01
Publication date: 2010-12-08
Anticipated expiration: 2029-04-01
Also published as: CN101527492A

Abstract

A high pressure resistant low-inertia direct-operated electro-mechanical conversion device comprises yoke steel parts, keeper parts, front end housings and back end housings; a first yoke steel, a second yoke steel, a third yoke steel and a fourth yoke steel are all of half-opening shape and are arranged on an outer ring of the keeper; the openings of the first yoke steel and the second yoke steel are opposite to each other and form a first cavity; a first magnetism isolating ring is positioned in the first cavity; a first control coil circles around the first magnetism isolating ring; the openings of the third yoke steel and the fourth yoke steel are opposite to each other and form a second cavity; a second magnetism isolating ring is positioned in the second cavity; a second control coil circles around the second magnetism isolating ring; a permanent magnet is positioned between the second yoke steel and the third yoke steel; joints between each magnetism isolating ring and each yoke steel, a side wall and the back end housing of the first yoke steel and a side wall and the front end housing of the fourth yoke steel are hermetically connected. The device can be directly connected with a digital valve plug, has good high pressure resistance and adapts to working in wet state.

Description

High pressure resistant low-inertia direct-operated electro-mechanical conversion

Technical field

The invention belongs to the electric energy that electrohydraulic digital valve is used in fluid transmission and the control field-mechanical energy switching mechanism, relate in particular to a kind of high pressure resistant low-inertia direct-operated electro-mechanical conversion.

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, in order to realize the straight-line conversion of digital valve spool that rotatablely moves from stepping motor, must between motor and hydraulic valve body, increase mechanical switch links such as leading screw or cam, and the existence of mechanical switch link has brought a series of gap, friction and wear problem, causes controlling unknown dead band and null offset; Moreover 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 low-inertia direct-operated electro-mechanical conversion that can directly link to each other, have good high pressure resistant property, adapt to work under the wet type state with the digital valve spool with the no sealed high-voltage resistant structure of electromechanical converter, the deficiency that can't under the wet type state, work and have the mechanical switch link.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of high pressure resistant low-inertia direct-operated electro-mechanical conversion, comprise the yoke parts, armature assembly, front end housing and rear end cap, described yoke parts are positioned at the outside of armature assembly, described armature assembly comprises armature and push rod, armature is installed on the push rod, one end of described push rod is installed on the front end housing, described yoke parts comprise first yoke, second yoke, the 3rd yoke, the 4th yoke, first magnetism-isolating loop, second magnetism-isolating loop, first control coil, second control coil and permanent magnet, described first yoke, second yoke, the 3rd yoke, the 4th yoke all is the half opening shape, described first yoke, second yoke, the 3rd yoke, the 4th yoke is arranged in the armature outer ring, the opening of described first yoke and second yoke 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 yoke and the 4th yoke 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 yoke and the 3rd yoke and by axial magnetic; The inner peripheral surface of described first yoke, second yoke, the 3rd yoke, the 4th yoke all has axially equally distributed a plurality of little teeth, and its facewidth and groove width equate, and the number of teeth of four yokes is identical; Distance between distance between first yoke and second yoke and the 3rd yoke and the 4th yoke equates, and the distance between first yoke and second yoke is the integral multiple of tooth pitch; The axial dimension of permanent magnet be tooth pitch (K-1/4) doubly, K is any positive integer; Have axially equally distributed a plurality of little teeth on the outer circumference surface of described armature, the facewidth equals groove width, and its tooth pitch requires and the tooth pitch of yoke equates; Described first magnetism-isolating loop and described first yoke, second yoke all are tightly connected; Described second magnetism-isolating loop and described the 3rd yoke, the 4th yoke all are tightly connected, and the sidewall of described first yoke and described rear end cap are tightly connected, and the sidewall of described the 4th yoke and described front end housing 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 yoke; The described second annular groove built-in ring also contacts with second yoke; 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 yoke; Described Fourth Ring connected in star built-in ring also contacts with the 4th yoke; The sidewall of described second yoke has the five rings connected in star, the sidewall of described the 3rd yoke 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, and the inwall of described rear end cap has the 8th annular groove, and described the 7th annular groove built-in ring also contacts with described the 4th yoke, and described the 8th annular groove built-in ring also contacts with described first yoke.

Further, described push rod is supported in the front end housing by linear bearing.

Further again, described armature is the drag cup shape.

Described front end housing, rear end cap, first magnetism-isolating loop, second magnetism-isolating loop and push rod are the non-magnetizer that non-magnet_conductible material is made; Described first yoke, second yoke, the 3rd yoke, the 4th yoke and drag cup armature are the magnetic conductor that soft magnetic material is made.

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, cancelled the mechanical switch link, electromechanical converter can directly link to each other with spool, has avoided the gap owing to the mechanical switch link, the departure that friction and wear brings; 3, armature motion inertia is little, the frequency response height, and response speed is fast, and dynamic property is good; 4, commutate and impact when resetting and noise little, working stability; 5, the control coil temperature rise is low, and lifetime of system is long; 6, 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 physical dimension schematic diagram of the present invention.

Fig. 3 a, 3b, 3c, 3d and 3e 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. 3 e, a kind of high pressure resistant low-inertia direct-operated electro-mechanical conversion, comprise the yoke parts, armature assembly, front end housing 16 and rear end cap 1, described yoke parts are positioned at the outside of armature assembly, described armature assembly comprise the drag cup shape armature 4 and can with the direct-connected push rod 5 of spool, drag cup armature 4 is installed on the push rod 5, one end of described push rod 5 is supported on the front end housing 16 by linear bearing 17, described yoke parts comprise first yoke 2, second yoke 10, the 3rd yoke 12, the 4th yoke 14, first magnetism-isolating loop 7, second magnetism-isolating loop 20, first control coil 8, second control coil 13 and permanent magnet 11, described first yoke 2, second yoke 10, the 3rd yoke 12, the 4th yoke 14 all is the half opening shape, described first yoke 2, second yoke 10, the 3rd yoke 12, the 4th yoke 14 is arranged in the armature outer ring, the opening of described first yoke 2 and second yoke 10 is relative and form first cavity, first magnetism-isolating loop 7 is positioned at described first cavity, and described first control coil 8 is looped around a phase of forming current excitation on first magnetism-isolating loop 7; The opening of described the 3rd yoke 12 and the 4th yoke 14 is relative and form second cavity, and described second magnetism-isolating loop 20 is positioned at described second cavity, and described second control coil 13 is looped around another phase of forming current excitation on second magnetism-isolating loop 20; Described permanent magnet 11 changes into the N utmost point and the S utmost point between described second yoke 10 and the 3rd yoke 12 and by axial magnetic; The inner peripheral surface of described first yoke 2, second yoke 10, the 3rd yoke 12, the 4th yoke 14 all has axially equally distributed a plurality of little teeth, and its facewidth and groove width equate, and the number of teeth of four yokes is identical; Be to realize continuous motion, between the distance between first yoke 2 and second yoke 10, the 3rd yoke 12 and the 4th yoke 14 apart from S _KMust equate, and require to be tooth pitch P _tIntegral multiple; The axial dimension G of permanent magnet 11 _KRequire to be tooth pitch P _t(K-1/4) doubly, K is any positive integer; Described first magnetism-isolating loop 7 all is tightly connected with described first yoke 2, second yoke 10; Described second magnetism-isolating loop 20 all is tightly connected with described the 3rd yoke 12, the 4th yoke 14, and the sidewall of described first yoke 2 and described rear end cap 1 are tightly connected, and the sidewall of described the 4th yoke 14 and described front end housing 16 are tightly connected.

The inner face of described first magnetism-isolating loop 7 has first annular groove and second annular groove, and the described first annular groove built-in ring also contacts with first yoke 2; The described second annular groove built-in ring also contacts with second yoke 10; The inner face of described second magnetism-isolating loop 20 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 yoke 12; Described Fourth Ring connected in star built-in ring also contacts with the 4th yoke 14; The sidewall of described second yoke 10 has the five rings connected in star, the sidewall of described the 3rd yoke 12 has the 6th annular groove, described five rings connected in star built-in ring also contacts with the sidewall of described permanent magnet 11, and described the 6th annular groove built-in ring also contacts with another sidewall of described permanent magnet 11; Described front end housing 16 inwalls have the 7th annular groove, the inwall of described rear end cap 1 has the 8th annular groove, described the 7th annular groove built-in ring also contacts with described the 4th yoke 14, and described the 8th annular groove built-in ring also contacts with described first yoke 2.

Present embodiment is an example with the structure of 15 teeth that evenly distribute on evenly distribute on each yoke of electromechanical converter 3 teeth, the armature, 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 yoke 2, second yoke 10, the 3rd yoke 12, the 4th yoke 14, first magnetism-isolating loop 7, second magnetism-isolating loop 20, first control coil 8, second control coil 13, permanent magnet 11, drag cup armature 4, push rod 5, front end housing 16, rear end cap 1 and

sealing ring

9,3,6,22,21,19,18,15; The opening of first yoke 2 and second yoke 10 is relative and form first cavity, built-in first magnetism-isolating loop 7, first control coil 8 is looped around a phase of forming current excitation on first magnetism-isolating loop 7, the opening of the 3rd yoke 12 and Di Di four yokes 14 is relative and form second cavity, built-in second magnetism-isolating loop 20, second control coil 13 is looped around another phase of forming current excitation on second magnetism-isolating loop 20, and permanent magnet 11 is placed on the centre of second yoke 10 and the 3rd yoke 12 and is changed into the N utmost point and S level by axial magnetic.

When fluid enters the armature working chamber, the outside of second yoke 10 and the 3rd yoke 12 respectively has an annular groove and is used for placing the 5th sealing ring 22, the 6th sealing ring 21, the inboard of front end housing 16 and rear end cap 1 respectively has an annular groove and is used for placing the 7th sealing ring 15, the 8th sealing ring 9, leaks out the fit clearance of fluid between the electromechanical converter parts preventing; First magnetism-isolating loop 7, second magnetism-isolating loop, 20 endoporus respectively have the uniform annular groove in a pair of left and right sides, be used for placing first sealing ring 3, second sealing ring 6, the 3rd sealing ring 19, the 4th sealing ring 18, make

control coil

8,13 and to be full of the armature working 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.

The inner peripheral surface of first yoke 2, second yoke 10, the 3rd yoke 12, the 4th yoke 14 all has axially equally distributed little tooth, and its facewidth and groove width equate, and the number of teeth of four yokes is identical; If be not subjected to the restriction of machining, the number of teeth is many more, and the response speed of electromechanical converter is high more, and dynamic property is good more, and nonlinearity erron is more little, and the characteristic of its multipolar system grading control is obvious more.

For obtaining high dynamic response, the armature 4 that has designed the drag cup shape matches with push rod 5, has the rotor tooth that axially equally distributed, the facewidth and groove width equate on its outer circumference surface, and it is equal with the tooth pitch of yoke that its tooth pitch requires, and is P _tWhole armature assembly is supported in the front end housing 16 by linear bearing 17, can rotate around central axis.

For satisfying the requirement of permanent magnetism polar flux and Current Control magnetic flux, front end housing 16, rear end cap 1, first magnetism-isolating loop 7, second magnetism-isolating loop 20 and push rod 5 are the non-magnetizer that non-magnet material is made, and first yoke 2, second yoke 10, the 3rd yoke 12, the 4th yoke 14 and drag cup armature 4 are the good magnetic conductor that soft magnetic material is made; For strengthening heat radiation, reduce the temperature rise of first control coil 8, second control coil 13, the material of first magnetism-isolating loop 7, second magnetism-isolating loop 20 also should have good heat-conducting.

As shown in Figure 2, for realizing the continuous motion of electromechanical converter, the distance between the distance between first yoke 2 and second yoke 10, the 3rd yoke 12 and the 4th yoke 14 must equate, with S _kRepresent this distance, S _kBe necessary for tooth pitch P _tIntegral multiple, thereby can guarantee the tooth alignment of the tooth of first yoke 2 and armature the time, the tooth center of second yoke 10 is just in time facing to the center of armature teeth groove; The axial dimension G of permanent magnet 11 _KRequirement remains tooth pitch P _t(K-1/4) doubly, K is any positive integer, thereby when guaranteeing the tooth alignment of the tooth of first yoke 2 and armature, the tooth center of the 3rd yoke 12 and the 4th yoke 14 all just in time is in respectively between armature tooth center and the groove center, does good position for next step motion of electromechanical converter and prepares.

The operation principle of present embodiment: shown in Fig. 3 a, first yoke 2, second yoke 10, the 3rd yoke 12, the 4th yoke 14 form four sections effective working gas gaps with drag cup armature 4 respectively; The size of representing suffered magnetic force with the density degree of each utmost point lower magnetic force line distribution, in the time of second control coil 13, first control coil, 8 obstructed electric currents, the polarizing magnetic field that each extremely descends to have only in the working gas gap permanent magnet to produce, this moment, the total magnetic conductance and the rotor-position of whole permanent magnetic circuit were irrelevant, and electromechanical converter does not produce thrust; Make that the armature position shown in Fig. 3 a is an initial position, when second control coil 13, first control coil 8 feed shown in Fig. 3 b

During the electric current of direction (inwards) along paper, Current Control magnetic field and permanent-magnet pole magnetizing field be mutual superposition in each working gas gap under extremely, wherein 12 times controlling magnetic fields of second yoke 10 and the 3rd yoke are identical with permanent-magnet pole magnetizing field direction, magnetic field intensity mutual superposition and strengthening; First yoke 2 is opposite with permanent-magnet pole magnetizing field direction with 14 times current fields of the 4th yoke, magnetic field intensity is cancelled out each other and is weakened, the thrust that drag cup armature 4 is subjected to the right moves 1/4 tooth pitch and is in the position shown in Fig. 3 b, this moment, whole magnetic circuit magnetic conductance reached maximum, and armature is in stable equilibrium position; When second control coil 13 feeds the electric current of ⊙ directions (outside along paper) and the sense of current of first control coil 8 when constant,

second yoke

10 and 14 times magnetic field intensity mutual superposition of the 4th yoke and strengthen;

First yoke

2 and 12 times magnetic field intensitys of the 3rd yoke are cancelled out each other and are weakened, and the thrust that drag cup armature 4 continues to be subjected to the right moves 1/4 tooth pitch and is in the position shown in Fig. 3 c, and this moment, whole magnetic circuit magnetic conductance reached maximum, and armature is in stable equilibrium position; With should second control coil 13 and first control coil 8 when all feeding the electric current of ⊙ direction,

first yoke

2 and 14 times magnetic field intensity mutual superposition of the 4th yoke and strengthen,

second yoke

10 and 12 times magnetic field intensitys of the 3rd yoke are cancelled out each other and are weakened, and the thrust that drag cup armature 4 is subjected to the right moves 1/4 tooth pitch again and is in the position shown in Fig. 3 d; When second control coil 13 feeds

When directional current and first control coil 8 feed the ⊙ directional currents,

first yoke

2 and 12 times magnetic field intensity mutual superposition of the 3rd yoke and strengthen,

second yoke

10 and 14 times magnetic field intensitys of the 4th yoke are cancelled out each other and are weakened, and the thrust that drag cup armature 4 is subjected to the right moves 1/4 tooth pitch and is in the position shown in Fig. 3 e.Comparison diagram 3a and Fig. 3 e 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, armature will move past a tooth pitch.Repeat above-mentioned step mode, armature will go down with the continuous to the right step motion of the step pitch of 1/4 tooth pitch; Change step mode, also can realize the opposite direction motion of armature; If two control coils feed the sine-wave current that phase difference is 90 degree simultaneously, then can realize the level and smooth continuous motion uniformly of armature.

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

1. A high-voltage-resistant low-inertia direct-acting electro-mechanical converter, comprising a yoke part, an armature part, a front end cover and a rear end cover, the yoke part is positioned at the outside of the armature part, and the armature part comprises an armature and Push rod, the armature is installed on the push rod, one end of the push rod is installed on the front end cover, it is characterized in that: the armature is a hollow cup shape, and the yoke parts include a first yoke and a second yoke , the third yoke, the fourth yoke, the first magnetic isolation ring, the second magnetic isolation ring, the first control coil, the second control coil and the permanent magnet, the first yoke, the second yoke, the third Both the yoke and the fourth yoke are semi-open, the first yoke, the second yoke, the third yoke, and the fourth yoke are arranged on the outer ring of the armature, and the first yoke and the second yoke The openings of the yoke are opposite and form a first cavity, the first magnetic isolation ring is located in the first cavity, and the first control coil is wound around the first magnetic isolation ring to form a phase of current excitation; the first magnetic isolation ring The openings of the three yokes and the fourth yoke are opposite to form a second cavity, the second magnetic isolation ring is located in the second cavity, and the second control coil is wound around the second magnetic isolation ring to form a current Another phase of excitation; the permanent magnet is located between the second yoke and the third yoke and is axially magnetized into N pole and S pole; the first yoke, the second yoke, the third yoke The inner circumferential surfaces of the yoke and the fourth yoke are provided with a plurality of small teeth evenly distributed in the axial direction, the tooth width and the groove width are equal, and the number of teeth of the four yokes is the same; the first yoke and the second yoke The distance between them is equal to the distance between the third yoke and the fourth yoke, and the distance between the first yoke and the second yoke is an integer multiple of the tooth pitch; the axial dimension of the permanent magnet is the tooth pitch (K-1/4) times, K is any positive integer; the outer peripheral surface of the armature is provided with a plurality of small teeth evenly distributed in the axial direction, the tooth width is equal to the slot width, and the tooth pitch requirement is the same as that of the yoke The tooth pitch is equal; the first magnetic isolation ring is sealed and connected with the first yoke and the second yoke; the second magnetic isolation ring is sealed and connected with the third yoke and the fourth yoke, The side wall of the first yoke is in sealing connection with the rear end cover, and the side wall of the fourth yoke is in sealing connection with the front end cover.

2. The high-voltage resistant low inertia direct-acting electro-mechanical converter according to claim 1, characterized in that: the inner surface of the first magnetic isolation ring is provided with a first annular groove and a second annular groove, so that The first annular groove is equipped with a sealing ring and is in contact with the first yoke; the second annular groove is equipped with a sealing ring and is in contact with the second yoke; the inner surface of the second magnetic isolation ring is provided with a third annular concave Groove and the fourth annular groove, the third annular groove is equipped with a sealing ring and is in contact with the third yoke; the fourth annular groove is equipped with a sealing ring and is in contact with the fourth yoke; the second yoke The side wall of the third yoke has a fifth annular groove, the side wall of the third yoke has a sixth annular groove, and the fifth annular groove is equipped with a sealing ring and is in contact with the side wall of the permanent magnet. The sixth annular groove is equipped with a sealing ring and is in contact with the other side wall of the permanent magnet; the inner wall of the front end cover has a seventh annular groove, and the inner wall of the rear end cover has an eighth annular groove, The seventh annular groove contains a sealing ring and contacts with the fourth yoke, and the eighth annular groove contains a sealing ring and contacts with the first yoke.

3. The high-voltage resistant low-inertia direct-acting electro-mechanical converter according to claim 1 or 2, wherein the push rod is supported in the front end cover through a linear bearing.

4. The high-voltage resistant low inertia direct-acting electro-mechanical converter according to claim 3, characterized in that: the front end cover, the rear end cover, the first magnetic isolation ring, the second magnetic isolation ring and the push rod All are non-magnetic bodies made of non-magnetic materials; the first yoke, the second yoke, the third yoke, the fourth yoke and the hollow cup armature are all magnetic bodies made of soft magnetic materials.