JP2015119631A - Linear drive device for pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a simple structure easily capable of displacing a movable element in both directions in a linear drive device for a pump.SOLUTION: A linear drive device 101 includes constituting members mutually adjusted and disposed so that, by fully using a first operable electromagnetic drive device 102a, a second operable electromagnetic drive device 102b, and a drive piston 110 capable of driving in an axial direction with drive devices thereof, each of the drive devices may drive the drive piston in a direction directed from a non-operated drive device toward the operated drive device.

Description

  In general, in a prior art ABS / ESP brake control system, a rotary electric motor, as well as a driven shaft, is used to drive a radially arranged hydraulic pump element that works mostly linearly. The eccentric body provided is used. These elements pump the driving medium from or to the wheel brake via a valve. For this reason, linear drives that are already partially used in other areas can also be a suitable variant embodiment.

  According to the prior art, for example, Patent Document 1 is known. Patent Document 1 describes a swing type compressor having an oscillator motor based on the principle of magnetoresistance. In this case, since the working coil is disposed on the stationary stator and the mover is made of a highly magnetically permeable material, current supply to the movable part is omitted. The working coil may be configured as an AC excitation coil provided on the magnetic pole of the stator. The windings of the two yokes of the stator act in one direction in common with respect to the displacement of the mover. Displacement is possible in both directions. Furthermore, a substantially rotationally symmetric configuration of the stator and the rotor is described. According to a preferred embodiment, a drive module having two outputs is described. Two reciprocating pistons operate in these outputs, and these reciprocating pistons are driven by the drive module and used to compress the refrigerant.

  According to the prior art, Patent Document 2 is further known, which includes at least one exciting coil that can be loaded with an electric current, a first return point, A reversible linear drive device having a magnetic mover movable in an alternating magnetic field between the return point and the return point is disclosed. The linear drive device has two E-shaped yokes each having three arms facing each other in a paired manner. One excitation coil is attached, each surrounding a central arm. The two exciting coils are loaded with current by a control circuit, and at this time, the current direction is defined such that the central arm forms pole pieces of different magnetic poles. By loading the windings with current, the mover is displaced leftward or rightward depending on the current direction. The substantially rod-shaped mover has a permanent magnet having four poles in its central region. The mover is connected to a piston that is reversibly movable in the compression chamber.

  Further, Patent Document 3 is known, and this Patent Document 3 describes a linear compressor. Each linear drive has a separate drive. Nevertheless, the displacement of the piston can take place in two opposite directions. The piston acts in both directions in the compression chamber. Furthermore, a spring element for assisting resetting is provided. This linear compressor is configured in a cylindrical shape.

German Patent Publication No. 1942945 International Publication No. 2008/046849 Specification JP 2002-031054 A

  A linear drive device according to the present invention includes a first operable electromagnetic drive device, a second operable electromagnetic drive device, and a drive piston that can be driven in the axial direction by the drive device. ing. The core of the present invention is that the components are adjusted to each other such that each actuated drive device drives the drive piston in a direction from an unactuated drive device to an actuated drive device, and It can be arranged.

  According to a preferred embodiment of the present invention, the linear drive device has an electromagnetic drive device each configured as a magnetoresistive drive device. In this case, each electromagnetic driving device has a stator composed of a stator core and coil windings, and a mover composed of a passive portion and a ferromagnetic active portion. A magnetoresistive drive has the advantage that expensive materials such as permanent magnets can be omitted. The magnetic field on the stator side is possible, for example, by using coil windings. On the other hand, the magnetization of the ferromagnetic active part of the mover on the mover side is formed by the magnetic field of the stator. In addition, the magnetoresistive drive is relatively simple in structure and control.

  The stator coil winding is housed in the coil housing portion of the stator. For this purpose, an opening in the stator core is required. This opening is used as a housing for the stator coil windings. The opening of the stator core means, for example, that the leg of the stator core and thus the stator core is completely interrupted at this point. In order to make this possible, the stator core may be configured in a U-shape in a suitable manner. Of course, other shapes are possible, for example, O-shaped, V-shaped, and omega-shaped. The opening in the stator core likewise allows the mover to be pushed into the opening in order to be able to adjust the minimum magnetoresistive position. The shape of the stator core and its opening are configured so that the maximum magnetic flux is obtained at a predetermined magnetomotive force for each position of the mover. The opening of the stator core can preferably be reduced by incorporating other elements. If the coil housing portion is not completely filled with the stator coil winding, the inner chamber of the stator core remains at that location. The inner chamber of the stator core further preferably allows displacement of the mover into this inner chamber.

  In a preferred form, a group of movers unique to each stator is arranged correspondingly. This provides an improved spatial separation between the two drives compared to a solution with only one mover group. This relaxes the limitations in designing the drive, or the same part of another system can be used. Each operation area of the electromagnetic drive device can be better configured and expanded. The mover group includes a passive portion, a so-called mover support, and an active portion, a so-called mover.

  Furthermore, in connection with reducing the necessary components, the two movers of the linear drive are preferably connected via a common passive part of the mover, the so-called mover support. The mover of the linear drive device may preferably be constituted by two mover groups combined with a drive piston.

  The mover is positioned so that it can have an optimal effect on the overall system in relation to its function. Furthermore, the active parts of the mover group are positioned relative to each other on a common mover support so that the mover can be displaced when the second mover is pushed to its overlap position. The minimum magnetoresistive position at which the mover is pushed during operation of the correspondingly arranged drive device is called the overlap position of the mover. In this case, each movable element is displaced in a predetermined displacement direction by operating the correspondingly arranged driving device. In this case, a force is also applied to the passive part of the movable element group connected to the active part of the movable element, that is, the aforementioned movable element support, and the movable element support is respectively moved along the vibration axis of the movable element. It can be displaced to the corresponding position in the displacement direction. The second mover connected via the mover support is similarly displaced. Thus, the mover can be displaced away from its overlap position by a simple and non-failing system, as well as by existing components. In addition, an indirect connection of the two movers configured directly or otherwise is also advantageous in order to allow a simple and inexpensive solution for displacing the movers.

  The stator coil housing of the linear drive device according to the invention, as well as the stator core opening required for this purpose, are open in the radial direction with respect to the drive piston in a preferred manner. According to an alternative embodiment, the opening of the coil housing, ie the stator core, is open in the axial direction with respect to the drive piston. Furthermore, the drive piston may be configured as a single or multiple pump piston acting in the compression chamber on both sides of the linear drive.

  In the case where a stator core having an opening for accommodating a coil winding, which is opened in a radial direction with respect to the drive piston, is provided, each is an action center plane of effective magnetic flux lines generated by the drive device. The axial spacing of the drive pistons between the two first surfaces located radially with respect to the drive piston is preferably located radially with respect to the drive piston and the strength of the respective mover. Greater than the axial distance of the drive piston between the two second surfaces, each centered in relation to the magnetic active part. Thereby, in a preferred manner, the actuator is displaced in the direction towards the compression chamber, in this case between the mover arranged corresponding to the actuated drive and the face of the drive piston acting in the compression chamber. It is guaranteed that a short thrust action interval is obtained.

  Two embodiments are provided when a stator core is provided that has an opening for accommodating the coil windings that opens in the axial direction of the drive piston. According to the first embodiment, the openings of the stator core are opened in opposite directions, and according to an alternative arrangement, the openings of the stator core are opened facing each other. It is configured.

  When a stator core having openings for accommodating coil windings, which are open in the axial direction of the drive piston, is provided and these openings are open in opposite directions, the linear drive device according to the present invention According to the embodiment, preferably, when the driving device is operated, the mover is generated by the driving device when moving toward the inner chamber of the correspondingly arranged stator (or in the direction of exiting the inner chamber). Axial spacing of the drive piston between the two first surfaces which are the respective intersecting surfaces of the clamped effective magnetic flux lines and the ferromagnetic active part of each mover that penetrates into the open coil housing Is greater than the axial distance of the drive piston between the two second surfaces that are located radially with respect to the drive piston and that are each centrally associated with the ferromagnetic active portion of each mover. Small (youthful Large).

  Implementation of a linear drive device according to the invention when a stator core with openings for accommodating coil windings is provided which opens in the axial direction of the drive piston and these openings are open facing each other According to the aspect, preferably, when the drive device is operated, the mover is generated by the drive device when moving toward the inner chamber of the correspondingly arranged stator (or in the direction of exiting from the inner chamber). The axial distance of the drive piston between the two first surfaces that are the respective intersecting surfaces of the effective magnetic flux lines formed and the ferromagnetic active portion of each mover that enters the open coil housing portion is Greater than the axial distance of the drive piston between the two second surfaces that are located radially with respect to the drive piston and that are each centrally associated with the ferromagnetic active portion of each mover (Youth It is small).

  According to the four preferred embodiments of the linear drive device according to the invention having axially aligned coil receiving portions, in the arrangement, the actuators are each displaced in a direction towards the compression chamber, It is possible to obtain a shorter thrust action interval between the mover arranged corresponding to the actuated drive device and the surface of the drive piston acting in the compression chamber. Thus, depending on the drive piston or the respective embodiment, the load on the mover support is reduced and thus the risk of buckling of the drive piston or mover support is reduced. The embodiment reduces the cost for constructing the element structurally rugged and thus increases the operational reliability of the overall system.

  According to a preferred embodiment of the linear drive device according to the present invention, the spacing and positioning of the stator cores from each other, the spacing and positioning of the components of the mover group, and the mutual components of the stator core and the mover group Spacing and positioning are possible by using spacer elements. This allows simple and inexpensive assembly as well as accurate alignment. Similarly, no adverse changes occur during product use. Therefore, high operational reliability is guaranteed.

  According to an alternative preferred embodiment, the use of an additional spacer element is achieved by connecting the stator core and the mover element to a correspondingly arranged component, for example a pump housing or a mover support. Can be omitted. For this reason, in addition to screw fixing and bonding and other connection types, especially crimp fixing of elements is suitable.

  According to one embodiment of the linear drive device according to the invention, preferably at least one spring element is used. This spring element is displaced by an actuated drive. That is, the drive can also provide the force necessary to compress or displace the spring. Preferably, the spring element is used for energy storage and to reset individual components of the actuator or mover group displaced by the actuated drive, the need for other reset systems Can be avoided. Moreover, since the spring stabilizes the harmonious movement of the mover, maximum efficiency is obtained in the vicinity of mechanical resonance. Similarly, this preferably causes a reaction force for the displacement and / or a damping of the displacement. More preferably, the preloaded spring also promotes displacement in one direction. In this case, the use of the spring element in the linear drive device is not limited to this, but is particularly suitable in relation to the function. The spring element may be constituted by one or a plurality of spring elements.

  Furthermore, various types of springs can be suitably used for the drive device, and various types of springs can be combined. In this case, the spring is, for example, a disc spring, a leaf spring, a compression coil spring, a free-form spring, or other component having spring elasticity and / or damping action, and a combination of these configurations. And / or may consist of a plurality of elements.

  The arrangement of the spring elements is possible at a plurality of positions of the linear drive. In a preferred form, the spring element is on one side between a mover or mover support or an element connected thereto and on the other side a housing or a housing-fixed bearing or an element connected thereto. It may be arranged. An alternative and preferred arrangement is the active or passive part of the mover or the mover spacer element or elements connected to it on one side and the stator or stator spacer element or connected to it on the other side Between the elements. This provides a very simple and inexpensive solution with a few changes to existing components. According to an alternative embodiment which is advantageous in relation to the installation space, the spring element is on one side a mover, in particular a free space of the mover, for example a mover groove, facing the mover, in particular the coil housing, and the other. On the side, it is arranged between the stator, in particular a protruding auxiliary element incorporated between the coil housing and the coil winding, for example a projection of the coil support incorporated in the stator.

  Furthermore, it has been found that the spring element is preferably made of a non-ferromagnetic material. This is particularly suitable if the spring element is positioned in the magnetic field of the drive device or in the peripheral region of the magnetic field.

  By using a special arrangement of non-magnetic material or certain components, electromagnetic short-circuit loops in the linear drive are avoided in a suitable manner. Such an electromagnetic short circuit loop may adversely affect the generation of force in the drive. For this purpose, for example, non-magnetic spacer rings are provided for insulating the covering, the intermediate cover and possibly other components from the drive device. The nonmagnetic mover accommodating portion also blocks the mover from the drive piston.

  For accommodating and / or supporting at least one spring element, preferably the components of the linear drive, in particular the stator spacer element and the mover spacer element, are suitable for accommodating and / or supporting the spring member. It is configured in a different shape.

  The linear drive further preferably has at least one axially movable drive piston, which is displaced by a passive part of the mover group of the linear drive connected to this drive piston. You can be kidnapped. The passive part of the mover group may further be connected to one or more drive pistons or pump pistons. Of course, such a function can also be obtained directly via the mover in addition to the passive part of the mover group.

  Depending on the direction of displacement by the respective drive device, the drive piston acts as a pump piston in the pump element. Due to such an action, the drive piston compresses the medium and / or pumps the medium in the pump element. The drive piston can act in the various pump elements even in the reverse direction.

  According to a preferred embodiment, each drive piston acts in a pump element located at a shorter spatial distance relative to the actuated drive, which displaces the pump element in the displacement direction. Thereby, the thrust action interval of the drive piston is kept short in a suitable manner.

  The linear drive device according to the invention is preferably configured as a piston pump device and comprises a piston pump with a drive piston, or a pump piston, and a linear drive device for operating the drive piston or pump piston. It's okay.

  The stator spacer element may further comprise an enlarged active cooling surface to improve the cooling function. This enlarged active cooling surface can be replaced by a recess in the spacer element.

  For the linear drive, a housing is preferably provided, which housing may be made of a diamagnetic material having an acoustic damping action. Furthermore, the housing may be made of a material having good thermal conductivity. This property can be improved by adding metal particles or other materials with good thermal conductivity.

  For example, to improve the magnetic field configuration in the intermediate region, the opening of the stator core is preferably reduced. For this purpose, one or more ferromagnetic elements can be incorporated in the openings in order to adapt the remaining gap spacing on demand.

It is a longitudinal cross-sectional view of the linear drive device which has the coil accommodating part open | released with respect to a needle | mover radially, and the structural member arrangement | positioning with a long thrust action | operation space | interval. It is a longitudinal cross-sectional view of the linear drive device which has the coil accommodating part opened to an axial direction with respect to a needle | mover, and the structural member arrangement | positioning with a long thrust action | operation space | interval. It is a longitudinal cross-sectional view of the linear drive device which has the coil accommodating part open | released with respect to a needle | mover radially, and the structural member arrangement | positioning with a short thrust action | operation space | interval. It is a longitudinal cross-sectional view of the linear drive device which has the coil accommodation part which mutually opens axially with respect to a needle | mover, and the structural member arrangement | positioning with the shortened thrust action | operation space | interval. It is a longitudinal cross-sectional view of the linear drive device which has the component accommodation arrangement | positioning with the coil accommodating part open | released to an axial direction with respect to a needle | mover, and a mutually reverse direction, and the shortened thrust action space | interval. It is a longitudinal cross-sectional view of a part of a linear drive device provided with a spring device between a stator spacer element and a mover spacer element. It is a longitudinal cross-sectional view of a part of a linear drive device provided with another spring device between a stator spacer element and a mover spacer element. It is a longitudinal cross-sectional view of a part of a linear drive device provided with a spring device between a spring support portion of a winding support and a mover annular groove. It is a longitudinal cross-sectional view of a part of a linear drive device provided with a spring device between the mover housing and the mover. FIG. 6 is a longitudinal sectional view of a part of a linear drive device with a mover element and a stator element according to another arrangement and embodiment.

  Hereinafter, the present invention will be described in detail using embodiments shown in the drawings, but the present invention is not limited to the illustrated embodiments.

  FIG. 1 is a longitudinal cross-sectional view of a linear drive device 101 having a coil housing portion 128 of stator cores 104a and 104b that opens radially to an actuator 108 in a component arrangement having a long thrust action interval 127. Show.

  The linear drive device 101 includes a first drive device 102a and a second drive device 102b configured as electromagnetic drive devices. These first and second driving devices are each configured as a magnetoresistive driving device. For this purpose, each driving device 102a or 102b has a stator 103a or 103b and a movable element group 129a or 129b arranged corresponding to each stator. The mover group 129a or 129b includes an active part (mover) 111a or 111b and a passive part (mover support) 109a or 109b.

  In addition to the active portions 111a and 111b of the mover groups 129a and 129b, the actuator 108 further includes a passive portion 109 of the mover groups 129a and 129b. The passive part 109 supports and connects the two active parts 111a and 111b. The passive portion 109 is integrally formed and is further connected to the drive piston 110. As a result, the drive piston 110 is displaced into one of the two compression chambers 117 in accordance with the displacement in the respective displacement direction 113 by the actuated drive device 102a or 102b.

  The driving devices 102a and 102b are configured in a cylindrical shape. The stator 103a or 103b includes a stator core 104 or 104b, respectively, and these stator cores surround the actuator 108 in a circular shape. The stator cores 104a and 104b are configured as a coil housing portion 128. Stator cores 104a and 104b are each open radially to actuator 108 in the illustrated embodiment.

  In this case, in particular, each stator core 104a or 104b has two free ends and is configured in a U shape. The free ends of the stator cores 104a and 104b partition the coil housing portion 128 of the stator coil winding 105a or 105b in the axial direction. The stator windings 105a or 105b are accommodated in the grooves of the U-shaped stator core 104a or 104b, and these stator windings 105a or 105b temporarily move the active portion of the actuator 108, particularly the mover. At least partially surrounding. A movable element group 129a or 129b is arranged corresponding to each stator 103a or 103b. The movers 111a and 111b are configured as active elements of the actuator 108 and are made of a ferromagnetic material. The movers 111a and 111b are connected to the mover support 109 and the drive piston 110 via the mover support 109 so as to be interlocked with each other. In this case, the mover 111a or 111b has the same axial length as the correspondingly disposed stator cores 104a or 104b.

  Each of the stator windings 105a or 105b has one electrical contact 106. As a result, current can be supplied alternately to the coil periodically. Magnetic fields are generated by the electrical contacts of the stator windings 105a or 105b via the respective stator cores 104a or 104b, and effective magnetic flux lines 107a or 107b are formed when current is supplied. In relation to the magnetic field, a radially extending working center plane 121 of the stator core 104a or 104b can be defined for each drive device 102a or 102b. Based on the configuration of the drive devices 102a and 102b and the configuration of the positioning of these drive devices 102a and 102b, the distance between the action center planes 121 of the two drive devices 102a and 102b is defined.

  Similarly, the magnetic field around the effective magnetic flux line 107a or 107b acts on the ferromagnetic material of the correspondingly disposed movable element 11a or 111b, and further forms the magnetic field and the effective magnetic flux line 107a or 107b, respectively. In connection with the ferromagnetic region of the mover 111a or 111b, a central plane 123 extending radially with respect to the actuator 108 for the mover 111a or 111b may be defined. Based on the configuration of the movers 111a and 111b and the configuration of the positioning of the movers 111a and 111b, the distance 124 between the center planes 123 of the active areas of the two movers 111a and 111b is defined.

  The movable elements 111a or 111b arranged corresponding to the respective driving devices 102a or 102b are movable corresponding to the driven devices 102a or 102b operated in the configuration of the magnetic field and effective magnetic flux lines 107a or 107b, respectively. It is pushed to the position of the minimum magnetic resistance between the child 111a or 111b. This position is referred to as an overlap position of each movable element 111a or 111b. In this case, each movable element 111a or 111b is displaced in a predetermined displacement direction 113 by actuating the corresponding driving device 102a or 102b. At this time, a force also acts on the actuator 108 connected to the mover 111a or 111b, and the actuator 108 is displaced to a corresponding position along the vibration axis 112 of the actuator 108 in each displacement direction 113.

  FIG. 1 shows the actuated drive 102a in one displaced end position. The illustrated displacement direction 113 indicates the displacement in the right direction that has already been performed by the driving device 102a. Further, in FIG. 1, the current supply to the driving device 102a is interrupted, and the driving device 102b is activated. As a result, an effective magnetic flux line 107b is formed. In the next step, the effective magnetic flux line 107b displaces the actuator 108 in the opposite displacement direction, that is, in the left direction. Similarly, for another drawing, the direction of displacement for the movement to the already performed end position for the actuated drive 102a is shown.

  The two movers 111a and 111b are arranged so that when the overlap position of one mover, in FIG. 1, the mover 111a exists, the other mover, in FIG. 1, the mover 111b comes out of the overlap position. They are arranged corresponding to each other so that they can be pushed. Therefore, a spacer element 126 is provided between the movers 111a and 111b, and the spacer element 126 can shift the two movers 111a and 111b in the axial direction. A spacer element 125 is also provided between the stator cores 104a and 104b, but the displacement due to the spacer element 125 is slight in the illustrated embodiment.

  One of the movers, in FIG. 1, the mover 111a is in an overlap position, and the current supply to the coil windings of the stator arranged corresponding to the mover 111a, in FIG. Instead, when current is supplied to the coil winding of the other stator, in FIG. 1, the coil winding 105b, the other mover, in FIG. It is pushed to the overlap position, to the right in FIG. This step is not shown in FIG.

  Accordingly, by alternately supplying current to the two coil windings 105a and 105b, the vibration motion of the actuator 108 can be generated. This oscillating motion is transmitted, for example, into the drive piston 110 and thus into the compression chamber 117 of the pump housing 116 by an interlocking connection.

  The driving devices 102a and 102b are substantially cylindrically configured in a rotationally symmetrical manner. Similarly, the actuator housing 114 has a cylindrical shape. In the illustrated embodiment, the connection element 115 allows the closure of the drives 102a and 102b, positioning and centering, and the connection of the linear drive 101 to the pump housing 116. The pump housing 116 has a compression chamber 117, and the drive piston 110 acts in the compression chamber 117. The connecting element 115 is further used to hold the guide ring 118, the support ring 119 and the seal ring 120.

  The thrust action interval is an interval existing between the mover arranged corresponding to the actuated drive device and the end face of the drive piston that is displaced in the compression chamber in the displacement direction. In the embodiment shown in FIG. 1, the thrust action interval 127 is the end face of the drive piston 110 that is displaced into the compression chamber 117 in the displacement direction 113 and the mover 111 a disposed corresponding to the actuated drive device 102 a. It is the interval between. Due to the configuration of the spacer elements 125 and 126 and the positioning of the stators 103a and 103b and the positioning of the movers 111a and 111b, in the illustrated embodiment, the actuator moves from left to right when the left drive is actuated. To be sedated. Along with this, the driving piston is pushed into the compression chamber arranged on the right side by the driving device on the left side. As a result, a long thrust action interval of the thrust rod is obtained from the starting end of the left movable element 111a to the spacer element 126, the right movable element 111b, and the remaining portion, that is, the movable element support 109 and the drive piston 110. It is done.

  FIG. 2 shows another embodiment of a linear drive device 201 having a component arrangement with a coil receiving portion 128 of the stator cores 104a, 104b and a long thrust acting interval 127 that opens axially with respect to the actuator. The longitudinal cross-sectional view of is shown. Preferably, in this arrangement, the mass of the ferromagnetic active element is small, only element 111a or 111b is ferromagnetic and the remaining elements are made of light metal, for example.

  Basically, reference is made to the configuration in the embodiment shown in FIG. The fundamental difference is that the stator cores 104a and 104b have a coil housing portion 128 that opens in the axial direction with respect to the actuator. FIG. 2 further shows an embodiment in which two driving devices 102a and 102b having two stator cores 104a and 104b are provided. In this embodiment, a coil housing portion 128 of the stator core 104a and a fixed portion are fixed. The coil accommodating portion 128 of the child core 104b is opposite to each other, and the movable element 111a or 111b is placed in the correspondingly arranged stator 103a or 103b when the driving device 102a or 102b is operated. It is pushed into the chamber 208.

  The coil accommodating portion 128 of the stator core 104a or 104b in the axial direction with respect to the actuator 108 is, for example, that the leg of the stator core 104a or 104b and eventually the stator core are completely in the axial direction with respect to the actuator 108. It means that it has been interrupted. In this embodiment, the opening due to the interruption is used as an accommodating portion for the mover 111a or 111b arranged correspondingly. For this reason, the shape and dimensions of the coil housing part 128 are adapted to the invading mover.

  The mover 111 a or 111 b is connected to the drive piston 110 via the mover support 109. In the illustrated embodiment, the mover support 109 is configured as a hollow shaft with a deformed end member. The drive piston 110 is integrally formed and is partially surrounded by the mover support 109. Both ends of the drive piston 110 act alternately as pistons on each one of two compression chambers (not shown) existing on both sides.

  Stator coil windings 105a and 105b are incorporated in the stator cores 104a and 104b. These stator coil windings 105a and 105b sufficiently fill the inner chamber 208 of the respective stator 103a or 103b. By supplying current to the coil windings 105a or 105b via the respective electrical contacts 106, a magnetic field is formed in the stator core 104a or 104b, and this magnetic field is applied to the coil housing portion 128 of the respective stator core 104a or 104b. Here, it acts on the associated mover 111a or 111b. The formed effective magnetic flux line 107a or 107b and the associated mover 111a or 111b have an intersection, and each of the effective magnetic flux line 107a or 107b and the mover 111a or 111b passes through this intersection. An intersection plane 206 is defined.

  The movers 111a and 111b attached to both sides of the mover support 109 are made of a ferromagnetic material. These movers 111a or 111b are similarly magnetized by the magnetic field of the associated magnetoresistive driving device 102a or 102b. In this case, the center plane 123 of the ferromagnetic active portion of the mover group 129a or 129b can be defined for each mover 111a or 111b. Further, a distance 124 between the two mover center planes 123 can be defined.

  From two stators 103a and 103b, each comprising a stator core 104a, 104b and stator coil windings 105a, 105b and possibly a spacer element 125 between the stator drive units as shown in FIG. For the stator group 202 formed, a reference position 203 of the stator group 202 can be defined, and this reference position 203 is a geometric center in the radial direction with respect to the cylindrical shaped part of the stator group 202. Indicated by face. A reference position 204 for the actuator can also be defined for the actuator 108 formed from the mover 111a or 111b and the mover support 109, and this reference position 204 is defined with respect to the cylindrical molding portion of the actuator 108. Indicated by a radial geometric center plane.

  When a current is supplied to the coil winding 105a or 105b in each stator core 104a or 104b, a magnetic flux is formed along the effective magnetic flux line 107a or 107b, and accordingly, each stator core 104a or 104b and its A magnetic field is formed in the coil housing part 128. This magnetic field pushes the mover 111a or 111b to a position having the minimum magnetic resistance. This position is shown in a cross-sectional view in which the mover 111a or 111b is disposed in the respective coil housing portion 128, that is, the mover housing portion of the stator core 104a or 104b. ) Obtained when the center of gravity coincides with the (geometric) center of gravity of the mover housing.

  In the embodiment shown in FIG. 2, the position of the minimum magnetic resistance is indicated by the mover 111a and the associated stator core 104a and stator coil winding 105a. In this case, the center plane 123 of the ferromagnetic active part of the movable element 111a of the actuated driving device 102a coincides with the intersecting surface 206 of the movable element and the effective magnetic flux line. Accordingly, the mover 111a is displaced rightward in the displacement direction 113 as indicated by reference numeral 205.

  The length of the mover support 109 and the positioning of the movers 111a and 111b are formed in the widths of the two driving devices 102a and 102b, the widths of the respective coil accommodating portions 128, and the coil accommodating portions 128. It is adjusted to the effective magnetic flux lines 107a and 107b. In the embodiment shown in FIG. 2, the coil accommodating portions 128 of the driving devices 102 a and 102 b are arranged in the opposite directions in the axial direction. In this case, the length of the mover support 109 and the mover support 109 The positioning of the movers 111a and 111b with respect to the width of the two drive devices 102a and 102b is adjusted in the following manner, that is, the mover 111a or 111b arranged corresponding to each drive device is The widths of the two driving devices 102a and 102b are adjusted so that the driving devices 102a or 102b are pushed toward the inner chamber 208 of the correspondingly arranged stator 103a or 103b.

  In this case, the interval 124 between the two mover elements 111a and 111b is larger than the interval 207 between the two intersecting surfaces 206 between the movers of the two drive devices 102a and 102b and the effective magnetic flux lines. As a result, a longer thrust action interval 127 is obtained. In this long thrust action interval 127, for example, in FIG. 2, the movable element 111a pushed into the associated coil housing portion 128 by the actuated driving device 102a The force acting on the mover 111a is transmitted in the right direction through the entire length of the mover support 109 and the drive piston 110 connected to the mover support 109, for example, into the facing compression chamber 117 shown in FIG.

  FIG. 3 is a longitudinal sectional view of the linear drive device 101 having the coil housing portions 128 of the stators 103a and 103b that open radially to the actuator 108 in a component arrangement according to the invention having a short thrust action interval 127. Indicates. Basically, reference is made to the above arrangement for the embodiment of FIG. The fundamental difference is that shorter thrust action intervals are realized by the arrangement, sizing and adjustment of the components of the linear drive according to the invention.

  Further, each stator core 104a or 104b has two free ends configured in a U-shape. A movable element 111a or 111b is arranged corresponding to each stator 103a or 103b. The mover 111a or 111b has the same axial length as the corresponding stator core 104a or 104b. The movers 111a and 111b are configured as active elements of the mover groups 129a and 129b, and are made of a ferromagnetic material. The movers 111a and 111b are connected to each other via a mover support 109 as a passive portion of the mover groups 129a and 129b. In the overlap position of one mover, for example, 111a in FIG. 3, the other mover, for example, 111b in FIG. 3 is pushed in a direction to exit from the overlap position.

  In the embodiment shown in FIG. 3, a spacer element is provided between the stators 103a and 103b. Similarly, a spacer element is provided between the movers 111a and 111b. These spacer elements are dimensionally designed, adjusted and arranged so that the distance between the movable element center planes is smaller than the distance between the operation center planes of the driving device. This provides a shorter thrust action interval.

  The thrust action interval is an interval between the mover provided corresponding to each actuated drive device and the end face of the drive piston that is displaced in the compression chamber in the displacement direction.

  With the configuration of the spacer elements 125 and 126, the positioning of the stators 103a and 103b, and the positioning of the movers 111a and 111b, in the embodiment shown in FIG. You can get exercise. As a result, the drive piston is pushed into the compression chamber arranged on the left side by the drive device on the left side. As a result, a short thrust action interval of the thrust rod is obtained directly from the starting end of the left armature 111a to the remaining portion, that is, the armature support 109 and the drive piston 110.

  FIG. 4 shows a longitudinal section of a linear drive device 201 having a coil housing part 128 of the stators 103a and 103b that opens axially with respect to the actuator 108 in a component arrangement according to the invention having a shortened thrust action interval 127. A plane view is shown. Basically, reference is made to the above arrangement for the embodiment of FIG. The fundamental difference is that a shortened thrust action interval is realized by the configuration, arrangement and adjustment of the components of the linear drive device according to the invention. In this case, the mass transferred in the embodiment of FIG. This makes it possible to obtain a high frequency and thereby a large volumetric flow rate of the pump.

  FIG. 4 shows an embodiment in which two driving devices 102a and 102b having two stator cores 104a and 104b are provided. In these stator cores 104a and 104b, the coil housing part 128 of the stator 103a and the coil housing part 128 of the stator 103b face each other, and the movable element 111a or 111b operates the respective driving device 102a or 102b. By doing so, it is pushed toward the inner chamber 208 of the correspondingly arranged stator 103a or 103b.

  The gap spacing of the opening of the stator core 104a or 104b formed by the coil housing 128 is reduced in the illustrated embodiment by incorporating a ferromagnetic ring element 403, and in relation to shape and size, the opening It is adapted to the mover 111a or 111b pushed in.

  The mover support 109 has a sleeve shape and is attached to an integral drive piston 110. The mover support 109 has a chamfered end and a flange at the center. Another mover support 402 as another element is attached to this flange, and this another mover support 402 is simultaneously configured as a spacer element of the two movers 111a and 111b. Defines the interval 124 of the movable element central surface 123.

  The effective magnetic flux line 107a or 107b formed in the drive device 102a or 102b and the associated mover 111a or 111b have an intersection, and one effective magnetic flux line 107a or 107b passes through this intersection. The intersection plane 206 can be defined by the mover 111a or 111b.

  Further, a spacer element 125 is provided between the driving devices 102a and 102b, and this spacer element 125 is configured as a stopper element, a centering and a housing part at the same time. The spacer element 125 defines an interval 207 between the intersecting surfaces 206 of the mover and the effective magnetic flux lines.

  Furthermore, FIG. 4 shows the possibility to avoid a short-circuit loop due to the magnetic flux in the magnetic field. The short-circuit loop of the magnetic flux is generated by the magnetically conductive components that are in direct contact with each other. Thus, non-magnetic spacer elements or sleeves 401 are used to separate the components and possibly to form an air gap between the magnet cores of the stators 103a, 103b and the pump housing 116. . Further, the spacer element 125 between the driving devices 102a and 102b and the mover support 109 may be manufactured to separate the drive piston 110 from the movers 111a and 111b made of a nonmagnetic material.

  In the embodiment shown in FIG. 4 having the coil accommodating portions 128 facing each other in the axial direction of the driving devices 102 a and 102 b, the length of the movable element support 402 and the movable elements 111 a and 111 b in the movable element support 402. Positioning is such that the mover 111a or 111b arranged corresponding to one driving device is pushed toward the inner chamber 208 of the stator 103a or 103b arranged correspondingly when the driving device 102a or 102b is operated. And the arrangement of the two driving devices 102a and 102b with the spacer element 125 interposed therebetween. In this case, the distance 124 between the two movable elements 111a and 111b is smaller than the distance 207 between the two intersecting surfaces 206 between the movable elements 111a and 111b of the two driving devices 102a and 102b and the effective magnetic flux lines.

  This results in a shortened thrust action interval 127 in the embodiment of FIG. 4, in which, for example, the actuated drive device 102b is pushed into the associated opening of the stator core 104b in this shortened thrust action interval 127. The movable element 111b exerts a force acting on the movable element on the adjacent compression chamber 117 shown on the right side in FIG. Communicate within.

  FIG. 5 shows a longitudinal section of a linear drive device 201 with a coil housing part 128 of the stators 103a, 103b that opens axially with respect to the actuator 108 in a component arrangement according to the invention with a short thrust action interval 127. The figure is shown. Basically, reference is made to the configuration relating to the embodiment of FIGS. The fundamental difference is that shorter thrust action intervals are realized by the configuration, arrangement and adjustment of the components of the linear drive device according to the invention.

  The length of the mover support 109 and the positioning of the movers 111a and 111b are formed in the widths of the two driving devices 102a and 102b, the respective openings of the coil housing portions 128 of the stators 103a and 103b, and the stator. Are aligned with the effective magnetic flux lines 107a and 107b. In the embodiment shown in FIG. 5 having the axially opposite coil housing portions 128 of the stators 103a and 103b, the mover 111a or 111b arranged corresponding to each drive device is the drive device 102a or 102b. The length of the mover support 109 and the mover support so that the inner chamber 208 of each stator 103a or 103b is pushed into the respective openings of the coil housing portions 128 of the stators 103a and 103b during the operation of The positioning of the movers 111a and 111b at 109 is adjusted to the width of the two drive devices 102a and 102b.

  FIG. 5 shows an embodiment in which two driving devices 102a and 102b having two stator cores 104a and 104b are provided. In this embodiment, the coil housing portion 128 of the stator 103a and the coil housing portion 128 of the stator 103b are opposite to each other, and the mover 111a is fixed from the inner chamber 208 of the stator 103a by the operation of the driving device 102a. It is pushed leftward into the opening of the coil housing part 128 of the child 103a.

  In this case, the interval 124 between the two mover elements 111a and 111b is smaller than the interval 207 between the two intersecting surfaces 206 of the movers 111a and 111b and the effective magnetic flux lines of the two drive devices 102a and 102b. Thereby, a shorter thrust action interval 127 is obtained, and in this thrust action interval 127, the mover 111a pushed into the corresponding opening of the coil housing portion 128 by the actuated driving device 102a is applied to this mover. The acting force is transmitted, for example, into the compression chamber 117 located in the vicinity, shown on the left side in FIG. 1, only through the end of the mover support 109 and the connected drive piston 110.

  FIG. 6 shows a longitudinal sectional view of a part of the linear drive device 101 in which the spring element 601 is disposed between the stator spacer element 603 and the mover spacer element 602a or 602b. One or more spring elements 601 are supported and supported by a stator spacer element 603. On the opposite side, the spring element 601 is supported by the mover spacer element 602a or 602b.

  The spring element 601 is used to reset the actuator 108 displaced in the displacement direction 113 of the actuated drive device 102. The energy required for resetting is temporarily stored in the spring element 601 when the actuator 108 is displaced. At this time, the spring element 601 is supported by the stator spacer element 603. In the illustrated embodiment, the spring element 601 is formed as a disc spring. Also possible are embodiments as coil springs, leaf springs, etc., as well as embodiments of simple form or for example combined as a set.

  FIG. 6 further shows another possibility to avoid a short circuit loop due to the magnetic flux. For this purpose, a non-magnetic spacer ring 604 is fitted laterally between the drive device 102a or 102b and a connection element 115 for connection to a pump housing 116 (not shown), for example. This connecting element is also configured for positioning the drive devices 102a, 102b.

  FIG. 7 shows a longitudinal sectional view of a part of a linear drive device 101 having a spring element 601 with another arrangement between a stator spacer element 603 and a mover spacer element 602. Basically, reference is made to the above embodiment. A fundamental difference is that a spring support portion configured as an intermediate flange is integrally incorporated in the mover spacer element 602. Further, other elements 701a and 701b are provided for supporting the movable elements 111a and 111b and the movable element spacer element 602 and keeping the distance therebetween.

  FIG. 8 is a longitudinal sectional view of a part of the linear drive device 101 having a spring element 601 with another arrangement between the spring support 802 of the winding support 801 and the annular groove 803 of the mover 111a or 111b. Show. Basically, reference is made to the above embodiment. The fundamental difference is that the spring element 601 is positioned in the hollow chamber of the mover annular groove 803.

  In this case, the mover annular groove 803 is used as a support element on one side for the spring element 601. The other end of the spring element 601 is supported by a winding support 801, and this winding support 801 is positioned between the coil winding 105a or 105b and the stator core 104a or 104b. . Further, the stator cores 104a and 104b are positioned relative to each other by a stator spacer element 804. The stator spacer element 804 has an intermediate flange, which is configured as a stopper 805 for the movers 111a and 111b.

  FIG. 9 shows a longitudinal sectional view of a part of the linear drive device 101 having a spring element 601 with another arrangement between the mover housing 114 or the connection element 115 and the mover 111a or 111b. Basically, reference is made to the above embodiment.

  In addition, a variation of the stator spacer element 125 according to FIG. 1 or the stator support and spacer element 804 shown in FIG. 9 is shown. In this case, the spacer element 804 has a recess 901. The recess 901 increases the active cooling surface. The recess 901 has a cooling structure (not shown) for improving heat loss.

  FIG. 10 shows a longitudinal sectional view of a part of a linear drive device having another arrangement and configuration of the actuator 108 and the elements of the drive devices 102a and 102b.

  Each stator core 104a or 104b further has two free ends. These free ends are substantially U-shaped. In this case, of course, the material notch and the shape conformity are formed according to the optimum configuration of the effective magnetic flux lines. The mover 111a or 111b is disposed corresponding to each stator 103a or 103b. The mover 111a or 111b has a reduced axial length in relation to the correspondingly disposed stator core 104a or 104b. The movers 111a and 111b are configured as active elements of the actuator 108 and are made of a ferromagnetic material. These movers 111 a and 111 b are connected to each other via a mover support 109. In the overlap position of the mover, for example, 111a in FIG. 3, each of the other movers, such as 111b, in FIG. 3 is pushed in a direction to exit from the overlap position.

  With such a configuration of the movers 111a and 111b and the stators 103a and 103b, the spacer element between the movers and the spacer element between the stators can be omitted. In the illustrated embodiment, the stator spacer element 125 and the mover spacer element 126 are, of course, configured as thinner non-magnetic components and are used to avoid magnetic shorting loops.

DESCRIPTION OF SYMBOLS 101 Linear drive device 102a 1st drive device 102b 2nd drive device 103a, 103b Stator 104a, 104b Stator core 105a, 105b Stator (coil) winding 106 Electrical contact 107a, 107b Effective magnetic flux line 108 Actuator 109, 109a, 109b Passive part (mover support)
110 Drive piston 111a, 111b Active part (mover)
112 Vibration axis 113 Displacement direction 114 Housing 115 Connection element 116 Housing 117 Compression chamber 118 Guide ring 119 Support ring 120 Seal ring 121 Action center plane 122 Distance 123 Center face 124 Distance 125 Stator spacer element 126 Movable spacer element 127 Thrust action interval 128 Coil housing portion 129a, 129b Movable element group 201 Linear drive device 202 Stator group 203, 204 Reference position 205 Displacement 206 Crossing surface 207 Distance 208 Inner chamber 402 Movable element support body 403 Ring element 601 Spring element 602a, 602b Movable element spacer Element 603 Stator spacer element 604 Spacer ring 701a, 701b Element 801 Winding support 802 Support part 803 annular groove 804 spacer element 901 recess

Claims (19)

A linear drive device (101, 102),
A first operable electromagnetic drive (102a);
A second operable electromagnetic drive (102b);
A drive piston (110) that can be driven axially by the drive devices (102a, 102b);
In the type having
Each actuated drive device (102a, 102b) drives the drive piston (110) from a non-actuated drive device in a direction (113) toward the actuated drive device (102a, 102b). Characteristic, linear drive device (101, 102).   The electromagnetic driving devices (102a, 102b) are respectively configured as magnetoresistive driving devices, and include a stator core (104a, 104b), a coil housing portion (128), and a stator coil winding (105a, 105b). And a movable member group (129a, 129b) comprising a passive part (109), in particular a movable part support, and a ferromagnetic active part (111a, 111b), in particular a movable part. The linear drive device (101, 102) according to claim 1, characterized in that:   The linear drive device (101, 102) according to claim 1, wherein each stator (103a, 103b) is provided with a single movable element group (129a, 129b).   The two ferromagnetic active parts (movers) (111a, 111b) of the mover group (129a, 129b) are the passive parts (mover support) (109) of the mover group (129a, 129b). The linear drive device according to claim 3, wherein the linear drive devices are connected to each other via a single line. The stator core (104a, 104b) has a coil housing part (128) for the stator coil winding (105a, 105b) that opens radially to the drive piston (110). And
Two first surfaces (in the radial direction with respect to the drive piston (110)), which are the action center surfaces of the effective magnetic flux lines (107a, 107b) generated by the drive devices (102a, 102b), respectively. 121), the axial interval (122) of the drive piston (110) is located in the radial direction with respect to the drive piston (110), and the strong groups of the mover groups (129a, 129b). The axial distance (124) of the drive piston (110) between the two second surfaces (123) located in the center in relation to the magnetic active parts (111a, 111b), respectively. The linear drive device (101) according to claim 1 or 2. The stator core (104a, 104b) has a coil housing (128) for the stator coil winding (105a, 105b) that opens in the axial direction of the drive piston (110); These coil housing parts (128) are opened in opposite directions,
When the movable element group (129a, 129b) moves toward the inner chamber (208) of the correspondingly arranged stator (103a, 103b) when the driving device (102a, 102b) is operated, The effective magnetic flux lines (107a, 107b) generated by the drive devices (102a, 102b) and the ferromagnetic elements of the mover groups (129a, 129b) entering the open coil housing portion (128). The axial distance (207) of the drive piston (110) between the two first surfaces (206) that are the respective intersecting surfaces with the active portions (111a, 111b) of the drive piston (110) In relation to the ferromagnetic active portions (111a, 111b) of each of the mover groups (129a, 129b). Between two of said second surface (123) located in the axial direction of or smaller than the distance (124) of the drive piston (110), or,
When the movable element group (129a, 129b) moves in the direction of exiting the inner chamber (208) of the correspondingly arranged stator (103a, 103b) when the driving device (102a, 102b) is operated, The effective magnetic flux lines (107a, 107b) generated by the drive devices (102a, 102b) and the strong forces of the movable element groups (129a, 129b) entering the open coil housing portion (128). The axial distance (207) of the drive piston (110) between the two first surfaces (206), which are the respective intersecting surfaces with the magnetic active portions (111a, 111b), is the drive piston (110). ) And in relation to the ferromagnetic active portions (111a, 111b) of the mover groups (129a, 129b), respectively. Between two of said second surface located at the center (123), greater than the axial spacing (124) of the drive piston (110),
A linear drive (201) according to claim 1 or 2, characterized in that. The stator (103a, 103b) has a coil housing portion (128) for the stator coil winding (105a, 105b) that opens in the axial direction of the drive piston, and these coil housings. Parts (128) are open facing each other,
When the movable element group (129a, 129b) moves toward the inner chamber (208) of the correspondingly arranged stator (103a, 103b) when the driving device (102a, 102b) is operated, The effective magnetic flux lines (107a, 107b) generated by the drive devices (102a, 102b) and the ferromagnetic elements of the mover groups (129a, 129b) entering the open coil housing portion (128). The axial distance (207) of the drive piston (110) between the two first surfaces (206), which are the respective intersecting surfaces with the active portions (111a, 111b) of the drive piston (110). ) And in relation to the ferromagnetic active portions (111a, 111b) of the mover groups (129a, 129b), respectively. Between two of said second surface (123) located in the central axial direction of the greater than the distance (124) of the drive piston (110), or,
When the movable element group (129a, 129b) moves in the direction of exiting the inner chamber (208) of the correspondingly arranged stator (103a, 103b) when the driving device (102a, 102b) is operated, The effective magnetic flux lines (107a, 107b) generated by the drive devices (102a, 102b) and the strong forces of the movable element groups (129a, 129b) entering the open coil housing portion (128). The axial distance (207) of the drive piston (110) between the two first surfaces (206), which are the respective intersecting surfaces with the magnetic active portions (111a, 111b), is the drive piston (110). ) And in relation to the ferromagnetic active portions (111a, 111b) of the mover groups (129a, 129b), respectively. Between two of said second surface (123) located in the center, smaller than the axial spacing (124) of the drive piston (110),
A linear drive (201) according to claim 1 or 2, characterized in that. The stators (103a, 103b) are positioned spaced apart from one another by at least one spacer element (125) and / or
The mover groups (129a, 129b) are positioned at a distance from each other by at least one spacer element (126);
The linear drive device (101, 201) according to claim 1, characterized by that. In particular,
For energy storage and reset and / or
To produce a reaction force and / or to attenuate the displacement and / or
To assist displacement and / or
For other purposes,
At least one spring element (601) for at least one mover group (129a, 129b) displaced by the actuated drive (102a, 102b) is provided;
The linear drive device (101, 102) according to claim 1, characterized by that.   At least one drive piston (110) moved in the axial direction acts on the pump element according to the displacement direction (113) of each drive device (102a, 102b), and in particular in the pump element, a compression chamber ( 117. Linear drive (101, 201) according to claim 1, characterized in that it acts to compress and / or pump the medium within 117).   In accordance with the displacement direction (113) of each drive device (102a, 102b), at least one drive piston (110) moving in the axial direction is driven in the pump element, in particular the activated drive device (102a, 102a, 102b). The linear drive device (101, 201) according to claim 1 or 10, characterized in that it acts in the compression chamber (117) located at a shorter spatial interval with respect to 102b).   12. A piston pump with one drive piston (110) and a linear drive device (101, 201) for operating the drive piston (110), in particular a linear drive according to any one of claims 1 to 11 A piston pump device, characterized in that it has a device (101, 102). The spring element (601) is
The active part (111a, 111b) or the passive part (109) of the movable element group (129a, 129b) or an element connected to the active part or the passive part, and a housing (116, 114) or a connecting element ( 115) or between a housing-fixed bearing or an element connected to this bearing and / or
The active part (111a, 111b) or the passive part (109) of the movable element group (129a, 129b), the movable element spacer element (126) or an element connected to the spacer element (126), and the fixed Between the child (103a, 103b) or the stator spacer element (125) or an element connected to the stator spacer element (125) and / or
The active part (111a, 111b) or the passive part (109) of the mover group (129a, 129b) and the coil housing part of the stator (103a, 103b), particularly the stator (103a, 103b) Between the winding support (801) incorporated in (128),
10. Linear drive (101, 102) according to claim 9, characterized in that it is arranged.   Linear drive (101, 102) according to claim 9, characterized in that the spring element (601) is made of a non-ferromagnetic material.   The spring element (601) is a disc spring, leaf spring, compression coil spring, free-form spring, or other component having spring elasticity and / or damping action, and a combination of these configurations Linear drive (101, 201) according to claim 9, characterized in that it is in shape and / or composed of a plurality of elements.   The stator spacer element (125) and / or the mover spacer element (126) are configured in a shape suitable for receiving and / or supporting at least one spring element (601). The linear drive device (101, 201) according to claim 8 or 9.   The stator spacer element (125) comprises an enlarged active cooling surface, the enlarged active cooling surface being formed by a recess (901) in the spacer element. The linear drive device (101, 201) according to 8. An actuator housing (114) and a pump housing (116) are provided for the linear drive,
The actuator housing (114) and the pump housing (116) are made of a particularly diamagnetic material having an acoustic damping action and / or
The actuator housing (114) as well as the pump housing (116) are made of a material having good thermal conductivity, especially by adding metal particles,
The linear drive device (101, 201) according to claim 1, characterized by that.   3. A gap according to claim 1 or 2, characterized in that the gap spacing of the opening of the stator core (104a, 104b), in particular the coil housing (128), is reduced by incorporating a ferromagnetic element. Linear drive device (101, 201).

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