Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
  • H02K41/02—Linear motors; Sectional motors
  • H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
  • H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/08—Structural association with bearings

Definitions

• the present invention relates to an arrangement for mounting a support of a linear electric motor.
• the present invention more particularly relates to an arrangement for mounting a support of a linear electric motor comprising a primer secured to the support and a secondary integral with a structure, of the type in which the support extends vertically and is movably mounted. on the structure in a longitudinal direction of displacement by means of guide means and of the type in which the vertical support comprises a main plate carrying the primary and at least a first, so-called upper, hooking wing comprising part of the means guide means for cooperating with another complementary part that includes the structure.
• connection between the guide elements and the support plate is made by means of compensation elements of a first and a second type which are capable of deforming respectively in at least one determined direction. in order to absorb the thermal expansion to avoid transmitting to the guide means the corresponding efforts that affect the operation thereof.
• the machines such as packaging machines, conventionally comprise a transfer device which, consisting of belts or chains driven by an asynchronous electric motor, is for example intended to convey the packages between different workstations. the machine.
• Linear motors have never been used to make a transfer device, in particular to perform successive and repeated operations at high speeds, because of the technical problems, including the warming of the engine as an unacceptable problem for such applications. .
• the object of the present invention is to propose, in the face of prejudices of the state of the art, a new arrangement for mounting a support of a linear motor which is particularly simple and reliable while being capable of compensating fully the thermal expansion caused by heating of the primary.
• the invention proposes an arrangement for mounting a support of a linear of the type described above, characterized in that the support is suspended relative to the structure via the means, said higher, of guiding so that the support is able to expand freely in a main direction of expansion, that is to say vertically downwards to compensate for the thermal expansion of the support material under the heating effect of the primary and that the upper guide means are not affected.
• the cantilevered mounting of the support which is suspended with respect to the structure makes it possible to simplify the guide means by only implementing a guide rail, which makes it possible to reduce the number of components and, incidentally, the cost .
• the guide means are arranged between the upper fastening flange and the portion of the structure located transversely vis-à-vis so that the support is suspended relative to the structure;
• the guide means are respectively constituted by an upper longitudinal rail which is integral with the structure and by complementary movable means, such as pads, which are integral with the upper attachment flange; the free bottom portion of the main plate of the support constitutes a deformable zone intended to allow, when the primer is heated during operation, the thermal expansion of the support material along the vertical main direction of expansion and in a direction in the opposite direction at the upper hanging wing;
• the support comprises a second flange, said lower, extending vertically downwardly from the main plate and the lower flange is the deformable area of the support;
• the lower flange of the support comprises positioning means which, integral with the second lower flange, are free to move relative to the structure in the vertical direction of expansion when there is thermal expansion of the support; and which are capable of moving longitudinally along a member carried by the structure so as to enhance the mechanical strength of the support and maintain a constant gap in the transverse direction by compensating for the attraction forces exerted between the primary and the secondary;
• the support belongs to a transfer device of a packaging machine comprising means, such as a gripping member of a package, which are secured to the support so as to be driven longitudinally in displacement.
• FIG. 1 is a perspective view which shows schematically, exploded, an arrangement comprising a linear motor and a support according to the invention which is mounted movably on a structure;
• FIG. 2 is a cross-sectional view along a vertical plane of the arrangement of FIG. 1 represented in the assembled position;
• Figure 3 is a cross-sectional view similar to Figure 2 showing an alternative embodiment.
• FIG. 1 shows an arrangement 10 comprising mainly a support 12 for a linear motor 14 according to a preferred embodiment of assembly according to FIG. the invention and part of a structure 16, such as a frame of a machine (not shown).
• the linear electric motor 14 is a linear motor of the "flat" type which consists respectively of a primary 18 of generally parallelepipedal shape and a secondary 20.
• the primary 18 is secured to the support 12 so as to form a moving element relative to the structure 16 which the secondary 20 is secured to.
• the support 12 carrying the primary 18 is generally parallelepipedal plate-shaped and extends for example here in a vertical plane.
• the secondary 20 is arranged vertically and transversely vis-à-vis the primary 18 at a transverse distance corresponding to a value "e" determined air gap.
• the secondary 20 extends here rectilinearly in the longitudinal direction to form a magnet path determining the path of movement of the support 12 and the primary 18 relative to the structure 16.
• the support 12 is mounted to move on the structure 16 with respect to which it moves horizontally in the longitudinal direction through the guide means 22.
• the support 12 here vertical, comprises a main plate 24 carrying the primary 18 and at least a first attachment wing 26, said upper attachment wing.
• the main guide means 22 are arranged vertically above the primary 18 between the first upper attachment wing 26 of the support 12 and the structure 16.
• the first upper attachment wing 26 comprises a movable portion of the guide means 22 intended to cooperate with another complementary fixed part that the structure comprises.
• the movable portion being here constituted by pads 28 before and rear which are slidable on a longitudinal rail 30, said upper.
• the support 12 is suspended relative to the structure 16 by means of said upper guide means 22 so that the support 12 is able to expand freely in a main direction of expansion , that is to say vertically downwards to compensate for the thermal expansion of the material of the support 12 under the heating effect of the primary 18 and that the upper guide means 22 are not affected.
• the support 12 extends vertically and generally parallel to the structure 16, the support 12 being suspended relative to said structure 16 by means of said upper guide means 22. so that the part of the support 12 extending vertically below the upper attachment flange 26 is free to expand downward under the heating effect of the primary 18 transmitted in particular to the central plate 24 of the support 12. Thanks to this arrangement 10, the support 12 is thus free to expand to completely compensate for the thermal expansion of the support material 12.
• the free bottom portion of the main plate 24 of the support 12 constitutes a deformable zone 32 intended to allow, when the element 18 heats up during operation, the thermal expansion of the material of the support 12 in the vertical main direction of expansion and in a direction opposite to the upper hooking wing 26.
• the primary 18 is heated and a large amount of heat is transmitted by conduction to the main plate 24 and causes the expansion of the material.
• FIG. 3 shows an alternative embodiment in which the support 12 comprises a second wing 34, called the lower attachment wing, extending vertically downwards from the main plate 24.
• the deformable zone 32 of the support 12 is mainly constituted by said second lower wing 34.
• the second lower flange 34 of the support 12 comprises positioning means 36 which cooperate with the structure 16 and which, integral with the second lower flange 34, are free to move in the vertical direction of expansion when there is thermal expansion of the support 12.
• the positioning means 36 comprise a spacer which is capable of moving longitudinally, for example by means of a wheel (not shown), along an element 38 forming a track carried by the structure
• the positioning means 36 make it possible in particular to reinforce the mechanical strength of the support 12 and to maintain an airgap "e" in the transverse direction which is constant and this by compensating for the forces of attraction exerted between the primary 18 and the secondary 20 .
• the support 12 belongs to a transfer device of a packaging machine comprising means 40, such as a gripping member of a package, which are secured to the support so as to be driven. in displacement, here longitudinally.
• a linear motor is capable in such a transfer device of driving the gripping members by obtaining high accelerations, a high speed of movement and a high accuracy in positioning.
• a linear motor is capable in such a transfer device of driving the gripping members by obtaining high accelerations, a high speed of movement and a high accuracy in positioning.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Electromagnetism (AREA)
• Power Engineering (AREA)
• Linear Motors (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37395922

Family Applications (1)

Country Status (7)

Families Citing this family (3)

Family Cites Families (17)

• 2006
  • 2006-04-20 FR FR0651392A patent/FR2900286A1/fr not_active Withdrawn
• 2007
  • 2007-04-17 EP EP07728165A patent/EP2008355A1/de not_active Withdrawn
  • 2007-04-17 WO PCT/EP2007/053700 patent/WO2007122136A1/fr not_active Ceased
  • 2007-04-17 CN CN200780013990.0A patent/CN101427448A/zh active Pending
  • 2007-04-17 JP JP2009505864A patent/JP2009535003A/ja active Pending
  • 2007-04-17 US US12/297,779 patent/US20090101769A1/en not_active Abandoned
  • 2007-04-17 MX MX2008013186A patent/MX2008013186A/es not_active Application Discontinuation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events