Electromagnetic contactor, method for adjusting gap between contacts of electromagnetic contactor, method for calculating stroke amount of electromagnetic contactor, and method for calculating compression amount of electromagnetic contactor

Abstract

The present invention provides an electromagnetic contactor capable of setting a gap between contacts to an appropriate value by a simple assembly work even if the dimensions of constituent parts have some variations, and capable of achieving a reduction in manufacturing cost. This electromagnetic contactor is provided with: a fixed contact (3) having a fixed contact point (9); an electromagnet unit (5) that connects a movable contact (4) having a movable contact point (10) that comes into contact with and separates from the fixed contact point via a contact point support (11); and a sealed container (2) that houses the fixed contact, the movable contact, and the electromagnet unit in the same space. The electromagnet unit (5) is provided with unit-side connecting parts (25a, 25b) which are connected from the moving direction of the movable contact to container-side connecting parts (33, 36) provided in the sealed container, and flat-plate-shaped spacers (34, 37) for adjusting the inter-contact gap (G) between the fixed contact and the movable contact are disposed between the container-side connecting parts and the unit-side connecting parts.

Description

Technical Field

[0001] The invention relates to an electromagnetic contactor with adjustable gap between contacts, a method for adjusting the gap between contacts of the electromagnetic contactor, and a method for calculating the stroke amount and the compression amount of the electromagnetic contactor. Background Art

[0002] For example, the electromagnetic contactor described in Patent Document 1 includes a fixed contact having a fixed contact, an electromagnet unit connected to a movable contact having a movable contact capable of contacting and separating with the fixed contact via a contact support, and a sealed container accommodating the fixed contact, the movable contact and the electromagnet unit in the same space. The electromagnetic contactor improves the isolation performance by stretching the arc generated between the fixed contact and the movable contact into a large arc extinguishing space in the sealed container.

[0003] In the electromagnetic contactor, various values ​​of the gap between the fixed contact and the movable contact, the stroke amount, and the compression amount of the contact spring provided on the contact support are set.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2023-81586 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In order to improve the isolation performance and vibration and impact resistance of the electromagnetic contactor, in the past, the operation of adjusting the gap between the contacts to an appropriate value became a time-consuming operation to form a part with improved dimensional accuracy. In addition, the operation of setting the stroke amount and the operation of setting the compression amount also became a time-consuming operation. Therefore, there is a problem in the manufacturing cost of the electromagnetic contactor.

[0009] Therefore, an object of the present invention is to provide an electromagnetic contactor and a method for adjusting the gap between contacts of the electromagnetic contactor, which can set the gap between contacts to an appropriate value by simple assembly work even if there are some variations in the dimensions of the constituent parts, and can reduce the manufacturing cost.

[0010] Another object of the present invention is to provide a method for calculating a stroke amount and a method for calculating a compression amount of an electromagnetic contactor, which can set a stroke amount and a compression amount (WipeAmount) by a simple operation.

[0011] Technical solutions to solve problems

[0012] In order to achieve the above-mentioned purpose, one embodiment of the present invention provides an electromagnetic contactor, which includes: a fixed contact having a fixed contact; an electromagnet unit, which is connected to a movable contact having a movable contact capable of contacting and separating with the fixed contact via a contact support; and a closed container that accommodates the fixed contact, the movable contact and the electromagnet unit in the same space, wherein a unit-side connecting portion is provided in the electromagnet unit and is connected to a container-side connecting portion provided in the closed container from the moving direction of the movable contact, and a flat-plate-shaped spacer for adjusting the inter-contact gap between the fixed contact and the movable contact is arranged in a sandwiched manner between the container-side connecting portion and the unit-side connecting portion.

[0013] In addition, a method for adjusting the gap between contacts of an electromagnetic contactor is provided, the electromagnetic contactor comprising: a fixed contact having a fixed contact; an electromagnet unit connected to a movable contact having a movable contact capable of contacting and separating with the fixed contact via a contact support; and a sealed container accommodating the fixed contact, the movable contact and the electromagnet unit in the same space, wherein a unit-side connecting portion connected to a container-side connecting portion provided in the sealed container in a moving direction of the movable contact is provided in the electromagnet unit, and a flat plate-shaped spacer for adjusting the gap between the contacts is arranged between the container-side connecting portion and the unit-side connecting portion to adjust the gap between the fixed contact and the movable contact. The inter-contact gap between moving contacts, the inter-contact gap adjustment method comprising: before connecting the electromagnet unit to the sealed container, the step of measuring a first distance L1 between a first surface of a unit-side connecting portion of the electromagnet unit abutting against a spacer and the movable contact along the moving direction of the movable contact; the step of measuring a second distance L2 between a second surface of a container-side connecting portion abutting against the spacer and the fixed contact along the moving direction of the movable contact; and the step of setting the thickness T of the spacer by the following formula (a) when the target value of the inter-contact gap is Gt and the thickness of the spacer is T,

[0014] T=Gt-(L2-L1)……(a)

[0015] The container-side connecting portion and the unit-side connecting portion are connected so as to sandwich a spacer having a thickness T, thereby adjusting the inter-contact gap between the fixed contact and the movable contact.

[0016] In addition, a method for calculating the stroke of an electromagnetic contactor uses the first distance L1 measured by the above-mentioned method for adjusting the gap between contacts of the electromagnetic contactor to calculate the stroke of the electromagnetic contactor. Before connecting the electromagnet unit to the sealed container, the third distance L3 between the first surface of the unit-side connecting portion abutting against the spacer and the movable contact along the moving direction of the movable contact is measured when the electromagnet unit is in an energized state, and the stroke S is calculated by the following formula (b).

[0017] S=L3-L1……(b)

[0018] Furthermore, a method for calculating the compression amount of an electromagnetic contactor uses the target value Gt of the contact gap used in the above-mentioned method for adjusting the contact gap of the electromagnetic contactor and the stroke amount S calculated by the above-mentioned method for calculating the stroke amount of the electromagnetic contactor to calculate the compression amount W using the following formula (c).

[0019] W=S-Gt……(c)

[0020] Effects of the Invention

[0021] According to the electromagnetic contactor and the method for adjusting the gap between contacts of the electromagnetic contactor of the present invention, the gap between contacts can be set to an appropriate value by simply assembling the components through normal operations without increasing the dimensional accuracy of the components, thereby achieving a reduction in manufacturing cost.

[0022] Furthermore, according to the stroke amount calculation method and the compression amount calculation method of the electromagnetic contactor of the present invention, the stroke amount and the compression amount can be set by a simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view showing the electromagnetic contactor of the present invention.

[0024] Figure 2 This is a developed perspective view showing a state in which a unit-side connecting portion of an electromagnet unit is connected to a container-side connecting portion of a capsule casing provided in the electromagnetic contactor of the present invention via a spacer.

[0025] Figure 3 The diagram shows a first distance between the electromagnet unit and a second distance between the capsule casings measured in order to select a spacer having a predetermined thickness.

[0026] Figure 4 The diagram shows an electromagnet unit in a non-excited state and an excited state for measuring the stroke amount of an electromagnetic contactor. DETAILED DESCRIPTION

[0027] Next, the embodiments of the present invention are described with reference to the accompanying drawings. In the following description of the accompanying drawings, the same or similar parts are marked with the same or similar reference numerals. However, the accompanying drawings are schematic diagrams, and it should be noted that the relationship between thickness and plane size, the ratio of thickness of each layer, etc. are different from reality. Therefore, the specific thickness and size should be determined by referring to the following description. In addition, of course, the drawings also include parts with different relationship and ratio of size between each other.

[0028] In addition, the embodiments shown below are examples of devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention does not specify the material, shape, structure, and arrangement of the components as described below. The technical concept of the present invention can be modified in various ways within the technical scope specified by the scope of the claimed rights.

[0029] In addition, terms indicating directions such as “upper”, “lower”, “left” and “right” described in the following description are used with reference to the directions of the drawings.

[0030] Figure 1 It is a figure which shows the electromagnetic contactor 1 which concerns on 1st Embodiment of this invention.

[0031] The electromagnetic contactor 1 is a sealed high-voltage contactor that uses electromagnetic force to open and close the main circuit, including a sealed container 2 made of resin with electrical insulation, and a pair of fixed contacts 3, a movable contact 4 and an electromagnet unit 5 housed in the sealed container 2. The electromagnet unit 5 drives the movable contact 4 in the direction of contact and separation with the pair of fixed contacts 3.

[0032] The sealed container 2 is composed of a capsule shell 6 and a capsule cap 7 .

[0033] The capsule housing 6 is Figure 1 The capsule cap 7 is a square cylindrical member with its lower end (one end) open and its upper end (the other end) closed. The capsule cap 7 is a lid-shaped member. The lower end of the capsule shell 6 and the open end of the capsule cap 7 are fitted together and fastened with a self-tapping screw (not shown).

[0034] The pair of fixed contacts 3 are electrodes formed of a conductive metal in a substantially cylindrical shape, and are integrated by insert molding in a state of penetrating the wall of the capsule case 6. A threaded hole 8 is formed on the upper portion of the pair of fixed contacts 3, and the threaded hole 8 is exposed on the outside of the capsule case 6. The terminal screws (not shown) on the primary and secondary sides of the main circuit are engaged with these threaded holes 8. The lower side of the pair of fixed contacts 3 protrudes into the interior of the capsule case 6, and a fixed contact point 9 is formed on their lower portion.

[0035] The movable contact 4 is a conductive metal. Figure 1 The movable contact 4 is formed in a flat plate shape extending in the left-right direction and arranged opposite to the pair of fixed contacts 3. A pair of movable contacts 10 capable of contacting and separating with the fixed contacts 9 of the pair of fixed contacts 3 are formed at both ends of the movable contact 4 in the left-right direction.

[0036] The movable contact 4 is connected to the electromagnet unit 5 via the contact support 11. The contact support 11 includes a base 12 connected to the electromagnet unit 5, a pressing member 13 for holding the movable contact 4, and a contact spring 14 set to a compression amount described later for applying contact pressure to the movable contact 4. The contact spring 14 is a compression coil spring, which is interposed between the base 12 and the movable contact 4. Figure 1 In this way, the movable contact 4 is elastically supported by the contact spring 14, and the contact pressure between the movable contact 10 and the fixed contact 9 is kept constant.

[0037] The electromagnet unit 5 includes a bobbin 20 , a sliding collar 21 , a movable plunger 22 , an armature 23 , a pair of outer yokes 24 , a pair of bottom yokes 25 a and 25 b , a plunger ring 26 , a return spring 27 , a permanent magnet 28 , and an auxiliary yoke 29 .

[0038] The bobbin 20 is a winding frame formed of a resin having electrical insulation properties, and a coil 31 is wound around a cylindrical bobbin 30 extending in the up-down direction.

[0039] The slide collar 21 is formed into a cylindrical shape by using a resin having electrical insulation properties, and is inserted into and fitted into the inner side of the bobbin 30 from the lower side in the vertical direction.

[0040] The movable plunger 22 is formed as a movable iron core in a cylindrical shape extending in the vertical direction, and is guided to advance and retreat in the axial direction by fitting with the inner side of the sliding collar 21. The upper side of the movable plunger 22 in the vertical direction is connected to the base 12 of the contact support 11 via the connecting portion 32. The armature 23 is a disc-shaped yoke, and is fixed to the lower end of the movable plunger 22.

[0041] The pair of outer yokes 24 are plate-shaped yokes fixed to the left and right sides of the bobbin 30. The pair of bottom yokes 25a and 25b are fixed to extend to the left and right sides on the same extension line from the lower portions of the pair of outer yokes 24.

[0042] The plunger ring 26 is a cylindrical yoke extending in the vertical direction, and is inserted into the inner side of the winding shaft 30 from the upper side in the vertical direction and fitted, and is fixed to the upper upper piece in the vertical direction of the pair of outer yokes 24. The inner diameter of the plunger ring 26 is larger than the outer diameter of the movable plunger 22, and is set to maintain a predetermined gap with the movable plunger 22.

[0043] The return spring 27 is a compression coil spring, and is inserted through the movable plunger 22 in a state of being sandwiched between the armature 23 and the plunger ring 26 , and urges the movable plunger 22 downward in the vertical direction relative to the winding frame 20 .

[0044] The permanent magnet 28 is a rectangular flat plate with a circular hole formed therein, and is arranged to contact the lower portions of the pair of bottom yokes 25a and 25b and surround the armature 23. The auxiliary yoke 29 is a flat plate yoke, and is attached to the lower portion of the permanent magnet 28. The unit-side connecting portion of the present invention corresponds to the pair of bottom yokes 25a and 25b.

[0045] The movable contact 4 is connected to the electromagnet unit 5 via the contact support 11. Figure 1 As shown in the enlarged portion of the main part of the figure marked 1A, a bottom yoke 25a of the electromagnet unit 5 abuts against the first shell side mounting surface 33 formed on the opening periphery of the lower part of the capsule shell 6 with the first spacer 34 in between, and a fixing screw 35 passing through the bottom yoke 25a is screwed into the capsule shell 6.

[0046] In addition, if Figure 2 As shown, a second housing side mounting surface 36 is formed at a position symmetrical to the first housing side mounting surface 33 with respect to the central axis of the capsule housing 6 at the opening periphery of the capsule housing 6. The other bottom yoke 25b of the electromagnet unit 5 abuts against the second housing side mounting surface 36 with the second spacer 37 interposed therebetween, and a fixing screw 35 penetrating the other bottom yoke 25b is screwed into the capsule housing 6. In addition, the second surface and the container side connecting portion of the present invention correspond to the first housing side mounting surface 33 and the second housing side mounting surface 36.

[0047] A pair of bottom yokes 25a, 25b abut against a first shell side mounting surface 33 and a second shell side mounting surface 36 arranged on the opening periphery of the capsule shell 6 via a first spacer 34 and a second spacer 37, and a fixing screw 35 passing through them is screwed into the capsule shell 6, thereby assembling the electromagnet unit 5 to the capsule shell 6.

[0048] like Figure 2 As shown in the figure, positioning protrusions 33a and 36a are formed on the first housing side mounting surface 33 and the second housing side mounting surface 36, and positioning holes 34a and 37a are formed on the first spacer 34 and the second spacer 37. When the first spacer 34 and the second spacer 37 are arranged on the first housing side mounting surface 33 and the second housing side mounting surface 36, the positioning protrusions 33a and 36a are inserted into the positioning holes 34a and 37a to position the first spacer 34 and the second spacer 37.

[0049] In the above-mentioned electromagnetic contactor 1, in the non-excitation state where the coil 31 of the electromagnet unit 5 is not energized, the movable plunger 22 is displaced downward by the magnetic force of the permanent magnet 28 and the repulsive force of the return spring 27, and the armature 23 is attracted to the auxiliary yoke 29. At this time, the contact support 11 is also displaced downward, so that the movable contact 10 is separated from the pair of fixed contacts 9 and becomes an open state.

[0050] On the other hand, when the coil 31 of the electromagnet unit 5 is energized and magnetized, the armature 23 is attracted to the bottom yoke 25, whereby the movable plunger 22 is displaced upward against the magnetic force of the permanent magnet 28 and the repulsive force of the return spring 27. At this time, the contact support 11 is also displaced upward, so that the movable contact 10 contacts the pair of fixed contacts 9 and becomes in the on state.

[0051] Here, the electromagnetic contactor 1 of this embodiment adjusts the thickness of the first spacer 34 and the second spacer 37 so that the inter-contact gap G between the fixed contact 9 and the movable contact 10 in the disconnected state becomes the target value Gt. The target value Gt is the inter-contact gap that can improve the isolation performance and vibration and impact resistance of the electromagnetic contactor 1.

[0052] Next, refer to Figure 2 and Figure 3 A procedure for adjusting the inter-contact gap G of the electromagnetic contactor 1 according to the present embodiment will be described.

[0053] First, if Figure 3 As shown, a first distance L1 between the contact surface 25b1 of the other bottom yoke 25b of the electromagnet unit 5 in the non-excitation state, which is in contact with the second spacer 37, and the movable contact 10 is measured using a measuring instrument such as a laser displacement meter. In addition, the dimension between the contact surface 25a1 of the bottom yoke 25a of the electromagnet unit 5, which is in contact with the first spacer 34, and the movable contact 10 is also the same dimension (first distance L1).

[0054] In addition, a second distance L2 between the first housing side mounting surface 33 of the capsule housing 6 and the fixed contact 9 of the fixed contact 3 is measured using a measuring instrument such as a laser displacement meter. In addition, the dimension between the second housing side mounting surface 36 and the fixed contact 9 is also the same dimension (second distance L2). In addition, the first surface of the present invention corresponds to the abutment surfaces 25a1 and 25b1.

[0055] The second distance L2 is set to a value larger than the first distance L1, and as shown in the following formula (1), the contact gap Ga when no adjustment is made is calculated by subtracting the first distance L1 from the second distance L2.

[0056] Ga=L2-L1……(1)

[0057] Next, as shown in the following formula (2), the insufficient gap amount Gn is calculated by subtracting the inter-contact gap Ga when no adjustment is made from the target value Gt.

[0058] Gn=Gt-Ga……(2)

[0059] Next, the first spacer 34 and the second spacer 37 having the same thickness as the insufficient gap amount Gn are selected.

[0060] Then, if Figure 2 As shown, the first spacer 34 and the second spacer 37 having the same thickness as the insufficient gap amount Gn are overlapped with the first shell side mounting surface 33 and the second shell side mounting surface 36 of the capsule shell 6. Next, one bottom yoke 25a and the other bottom yoke 25b of the electromagnet unit 5 are overlapped on the first spacer 34 and the second spacer 37, and the electromagnet unit 5 is assembled to the capsule shell 6 by screwing in the fixing screw 35, so that the inter-contact gap G between the fixed contact 9 and the movable contact 10 is adjusted to the target value Gt (refer to Figure 1 ).

[0061] Therefore, the electromagnetic contactor 1 of this embodiment only selects the first distance L1 of the electromagnet unit 5 in the non-excitation state, the second distance L2 of the capsule housing 6, and the first spacer 34 and the second spacer 37 of the thickness such that the gap G between contacts becomes the target value Gt, and even if there are some deviations in the dimensions of the components of the movable contact 4, the contact support 11, and the electromagnet unit 5, the gap G between contacts can be adjusted by a simple assembly operation. Therefore, the manufacturing cost of the electromagnetic contactor 1 can be reduced.

[0062] Next, a procedure for calculating the stroke amount S and the compression amount W of the electromagnetic contactor 1 according to the present embodiment will be described.

[0063] like Figure 4 As shown in the right side figure of FIG. 1 , a third distance L3 between the abutting surface 25 a 1 of one bottom yoke 25 a of the electromagnet unit 5 in the excited state and the movable contact 10 is measured using a measuring instrument such as a laser displacement meter.

[0064] Then, as shown in the following formula (3), the stroke amount S of the electromagnetic contactor 1 is calculated by subtracting the first distance L1 (the electromagnet unit 5 is in a non-excited state) from the third distance L3.

[0065] S=L3-L1……(3)

[0066] On the other hand, the compression amount W of the contact spring 14 of the contact support 11 that applies contact pressure to the movable contact 4 when the movable contact 10 contacts the pair of fixed contacts 9 and becomes the ON state is calculated by subtracting the inter-contact gap G from the stroke amount S as shown in the following formula (4).

[0067] W=S-G……(4)

[0068] Therefore, the electromagnetic contactor 1 of the first embodiment can easily calculate the stroke amount S and the compression amount W by simply calculating the first distance L1 of the electromagnet unit 5 in the non-excited state, the third distance L3 of the electromagnet unit 5 in the excited state, and the inter-contact gap G.

[0069] Description of Reference Numerals

[0070] 1Electromagnetic contactor

[0071] 2 airtight containers

[0072] 3 Fixed contacts

[0073] 4 movable contacts

[0074] 5 Electromagnet unit

[0075] 6 capsule shell

[0076] 7 capsule caps

[0077] 8 threaded holes

[0078] 9 Fixed contacts

[0079] 10 movable contacts

[0080] 11Contact support

[0081] 12 Base

[0082] 13 Pressing parts

[0083] 14Contact spring

[0084] 20 Winding rack

[0085] 21 Sliding collar

[0086] 22 Movable plunger

[0087] 23 Armature

[0088] 24 Outer yoke

[0089] 25a, 25b bottom yoke

[0090] 26 plunger ring

[0091] 27 Return spring

[0092] 28Permanent magnet

[0093] 29 Auxiliary yoke

[0094] 30 winding spools

[0095] 31 coils

[0096] 32 connection part

[0097] 33 first housing side mounting surface

[0098] 33a, 36a positioning protrusions

[0099] 34 first spacer

[0100] 34a, 37a positioning holes

[0101] 35 fixing screw

[0102] 36 Second housing side mounting surface

[0103] 37 Second spacer

[0104] G gap between contacts

[0105] Gt Target value of the gap between contacts

[0106] Contact gap when Ga is not adjusted

[0107] Gn insufficient clearance

[0108] L1 first distance

[0109] L2 Second Distance

[0110] L3 third distance

[0111] S Stroke

[0112] W compression amount.

Claims

1. An electromagnetic contactor, characterized in that: include: A fixed contact having a fixed contact point; an electromagnet unit connected to a movable contact having a movable contact point capable of contacting and separating with the fixed contact point via a contact point support; and The fixed contact, the movable contact and the electromagnet unit are housed in a sealed container in the same space. The electromagnet unit is provided with a unit-side connection portion connected to a container-side connection portion provided in the sealed container from a moving direction of the movable contact. A flat plate-shaped spacer for adjusting an inter-contact gap between the fixed contact and the movable contact is disposed between the container-side connecting portion and the unit-side connecting portion in a sandwiched manner.

2. The electromagnetic contactor according to claim 1, characterized in that: The sealed container comprises a cylindrical capsule shell with one end open and the other end closed, and a capsule cap closing the open end of the capsule shell. The fixed contact is formed integrally with the other closed end of the capsule shell so that the fixed contact protrudes into the interior of the capsule shell. The container-side connecting portion is a housing-side mounting surface formed on a peripheral edge of an open end of the capsule housing, and the spacer is disposed so as to be sandwiched between the housing-side mounting surface and the unit-side connecting portion.

3. The electromagnetic contactor according to claim 1 or 2, characterized in that: The distance between the first surface of the unit-side connecting portion abutting against the spacer and the movable contact point along the moving direction of the movable contact when the electromagnet unit is in a non-excitation state is a first distance L1, The distance between the second surface of the container-side connecting portion abutting against the spacer and the fixed contact along the moving direction of the movable contact is defined as a second distance L2. When the target value of the contact gap is Gt, The thickness T of the spacer is set by the following formula (a): T=Gt-(L2-L1)......(a).

4. A method for adjusting the gap between contacts of an electromagnetic contactor, wherein: The electromagnetic contactor comprises: A fixed contact having a fixed contact point; an electromagnet unit connected to a movable contact having a movable contact point capable of contacting and separating with the fixed contact point via a contact point support; and The fixed contact, the movable contact and the electromagnet unit are housed in a sealed container in the same space. The electromagnet unit is provided with a unit-side connection portion connected to a container-side connection portion provided in the sealed container from a moving direction of the movable contact. A flat plate-shaped spacer for adjusting the gap between contacts is arranged between the container-side connecting portion and the unit-side connecting portion to adjust the gap between contacts between the fixed contact and the movable contact. The contact gap adjustment method comprises: Before connecting the electromagnet unit to the sealed container, a step of measuring a first distance L1 between a first surface of the unit-side connecting portion abutting against the spacer and the movable contact point along the moving direction of the movable contact when the electromagnet unit is in a non-excited state; a step of measuring a second distance L2 between a second surface of the container-side connecting portion abutting against the spacer and the fixed contact along a moving direction of the movable contact; and When the target value of the inter-contact gap is Gt and the thickness of the spacer is T, the step of setting the thickness T of the spacer by the following formula (a) is performed. T=Gt-(L2-L1)……(a) The container-side connecting portion and the unit-side connecting portion are connected to each other with the spacer having a thickness T interposed therebetween, thereby adjusting the inter-contact gap between the fixed contact and the movable contact.

5. A method for calculating the stroke of an electromagnetic contactor, characterized in that: The stroke amount of the electromagnetic contactor is calculated using the first distance L1 measured by the method for adjusting the gap between contacts of the electromagnetic contactor according to claim 4, Before connecting the electromagnet unit to the sealed container, a third distance L3 between the first surface of the unit-side connecting portion abutting against the spacer and the movable contact along the moving direction of the movable contact is measured when the electromagnet unit is in an excited state. The stroke S is calculated by the following formula (b): S=L3-L1……(b).

6. A method for calculating the compression amount of an electromagnetic contactor, characterized in that: The compression amount W is calculated by the following formula (c) using the target value Gt of the inter-contact gap used in the method for adjusting the inter-contact gap of the electromagnetic contactor according to claim 4 and the stroke amount S calculated by the method for calculating the stroke amount of the electromagnetic contactor according to claim 5: W=S-Gt……(c).

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