Switch and winding switching device

Abstract

The present invention aims for high reliability and long life by eliminating sliding. The switch of the present invention includes: a first terminal and a second terminal, which are adjacently mounted on a fixing member; a movable shaft that can move in a first direction and a second direction; a plurality of movable members mounted on the movable shaft; and a movable slice connected to two of the plurality of movable members and applying a force in a direction in which the two movable members are separated. This switch can switch between a first mode, an intermediate mode, and a second mode. In the first mode, the movement of the movable member in the first direction causes the movable member to be pressed by the fixing member, deforming the movable slice so as to protrude in the direction of the terminal, thereby bringing the movable slice into contact with the first terminal. The intermediate mode is a state where the deformation of the movable slice caused by the movable member is released, and the movable slice is not in contact with either the first terminal or the second terminal. The second mode is a state where the movement of the movable member in the second direction causes the movable member to be pressed by the fixing member, deforming the movable slice so as to protrude in the direction of the terminal, thereby bringing the movable slice into contact with the second terminal.

Description

Technical Field

[0001] The present invention relates to a switch, and more particularly to a technology of a winding switching device suitable for switching the windings of a rotating electric machine. Background Art

[0002] The driving motors of electric vehicles such as electric cars and hybrid cars have low system efficiency in the low-speed range, and it is necessary to improve the energy efficiency. Therefore, there is a winding switching technology for switching windings in the low-speed range and the high-speed range. For example, in the low-speed range, a series connection is set to increase the voltage, thereby reducing the current to 1 / 2 of the conventional value. As a result, the conduction loss and switching loss of the inverter semiconductor elements are halved, so the inverter efficiency is improved, the system efficiency is increased, and the energy consumption can be reduced.

[0003] As the background art in this technical field, there is Japanese Patent Laid-Open No. 2017-70112 (Patent Document 1). Japanese Patent Laid-Open No. 2017-70112 discloses a winding switching device that switches the wiring state of the windings of a motor equipped with a plurality of windings, and includes a device main body, a movable body, and a driving device that drives the device main body and the movable body in the switching direction. The device main body includes a plurality of electrodes to which the ends of the windings are respectively connected. The movable body includes a series connection circuit portion and a double parallel connection circuit portion. The series connection circuit portion includes a plurality of partner side electrodes that contact the electrodes of the device main body and a series connection circuit that connects the windings in series, and the series connection circuit portion includes a plurality of partner side electrodes that contact the electrodes of the device main body and a double parallel connection circuit that connects the windings in parallel (refer to the abstract).

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Laid-Open No. 2017-70112 Gazette Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] In the technology described in the above-mentioned Patent Document 1, the contact resistance is reduced by pressing the contacts against each other by the elastic force of a spring, so there is a problem that the sliding portion wears out during the switching of the contacts.

[0009] An object of the present invention is to achieve high reliability and long life of the switch by switching the connection in a state where the contacts are separated from the terminals during the switching of the contacts, that is, without sliding.

[0010] Technical Means for Solving the Problems

[0011] A representative example of the invention disclosed in the present application is shown below. That is, a switch that switches an electrical connection state, characterized by comprising: a first terminal and a second terminal, which are adjacently mounted on a fixing member; a movable shaft that can move along a first direction and a second direction opposite to the first direction; a plurality of movable members that are mounted on the movable shaft; and a movable slice that is connected to two of the plurality of movable members and applies a force in a direction separating the two movable members. This switch can switch between a first mode, an intermediate mode, and a second mode. In the first mode, the movement of the movable member in the first direction causes the movable member to be pushed by the fixing member, deforming the movable slice so as to protrude in the direction of the terminal, and thus the movable slice contacts the first terminal. In the intermediate mode, the deformation of the movable slice caused by the movable member is released, and the movable slice contacts neither the first terminal nor the second terminal. In the second mode, the movement of the movable member in the second direction causes the movable member to be pushed by the fixing member, deforming the movable slice so as to protrude in the direction of the terminal, and thus the movable slice contacts the second terminal.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to reduce the contact resistance while reducing the wear during contact switching. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments. Description of the Drawings

[0014] Figure 1 A perspective view of the winding switching device of Embodiment 1.

[0015] Figure 2 A cross-sectional view of the winding switching device of Embodiment 1.

[0016] Figure 3 A diagram showing the operation of the movable slice of Embodiment 1.

[0017] Figure 4 A diagram showing a connection example of the winding switching device of Embodiment 1.

[0018] Figure 5 A cross-sectional view showing the contact portion between the fixing member and the movable member of Embodiment 1.

[0019] Figure 6 A diagram showing a plate-like member during the formation of the movable slice of Embodiment 1.

[0020] Figure 7 For showing in order to Figure 6 A diagram showing the state in which the plate-like member shown is curled to be mounted as the movable slice.

[0021] Figure 8 As viewed axially Figure 7 Schematic diagram of the movable slice shown

[0022] Figure 9 Schematic diagram showing a cross section of the winding switching device of Embodiment 1

[0023] Figure 10 Cross-sectional view of the winding switching device of Embodiment 2 Detailed implementation mode

[0024] Next, a winding switching device, which is an example of a device using the switch of the present invention, will be described

[0025] 〈Embodiment 1〉

[0026] Figure 1 This is a perspective view of the winding switching device of Embodiment 1 of the present invention. The fixing member 1 and the terminals 51 to 54 are shown in a three-quarter cross-section after cutting off one-quarter

[0027] Figure 1 The winding switching device shown has a fixing member 1, a movable shaft 2, a plurality of movable members 31 to 36, movable slices 41 to 44, and terminals 51 to 54. The fixing member 1 is formed in a cylindrical shape. The movable shaft 2 can move axially inside the fixing member 1. The plurality of movable members 31 to 36 are mounted around the movable shaft 2 in a manner that allows them to slide axially. The movable slices 41 to 44 are mounted between adjacent movable members 31 to 36. The terminals 51 to 54 are mounted on the inner circumference of the fixing member 1. The movable members 31 to 36 are biased in the direction of creating a gap 37 due to the springiness of the movable slices 41 to 44. There is a gap 37 between adjacent movable members 31 to 36 in a state where the movable members 31 and 36 at both ends are not in contact with the fixing member 1

[0028] Constitute Figure 1 The switch of the winding switching device shown has, in its minimum configuration, a fixing member 1, a movable shaft 2, a plurality of movable members 31, 32, a movable slice 41, and terminals 51, 52. The fixing member 1 is formed in a cylindrical shape. The movable shaft 2 can move axially inside the fixing member 1. The plurality of movable members 31, 32 are mounted around the movable shaft 2 in a manner that allows them to slide axially. The movable slice 41 is mounted between adjacent movable members 31, 32. The terminals 51, 52 are mounted adjacent to each other on the inner circumference of the fixing member 1

[0029] The fixing member 1 is formed in a cylindrical shape with a hollow interior to form the housing of the winding switching device. The shape of the outer side surface of the fixing member 1 can be the cylindrical shape shown in the figure or other shapes. The fixing member 1 is formed of an insulator (resin) and is provided with holes capable of leading out the electrical signals flowing through the terminals 51 to 54 to the outside. The terminals 51 to 54 are formed of a conductor (such as metal) and are fixedly formed in a cylindrical shape on the inner circumference of the fixing member 1. A gap is provided between adjacent terminals 51 to 54 to maintain insulation.

[0030] The movable shaft 2 is formed in a cylindrical shape capable of moving axially inside the fixing member 1, and grooves for engaging the movable members 31 to 36 are provided on its outer peripheral surface (refer to Figure 2 ). The movable shaft 2 is formed of an insulator (resin).

[0031] The movable members 31 to 36 are annular and are engaged with the engaging grooves of the movable shaft 2, and are installed across the entire outer circumference of the movable shaft 2 in such a manner as to be able to move axially in the engaging grooves. A movable slice 41 is installed between the movable member 31 and the movable member 32 with the contact point protruding toward the outer peripheral side, a movable slice 42 is installed between the movable member 32 and the movable member 33 with the contact point protruding toward the outer peripheral side, a movable slice 43 is installed between the movable member 34 and the movable member 35 with the contact point protruding toward the outer peripheral side, and a movable slice 44 is installed between the movable member 35 and the movable member 36 with the contact point protruding toward the outer peripheral side.

[0032] The movable members 31 to 36 are formed of an insulator (resin) or a conductor (metal). When the movable member 32 is formed of a conductor, the movable slice 41 and the movable slice 42 are electrically connected via the movable member 32. On the other hand, when the movable member 32 is formed of an insulator, a conducting member (such as a jumper wire) for electrically connecting the movable slice 41 and the movable slice 42 is required, and as a method of electrical connection, the movable slice 41 and the movable slice 42 can be integrally formed. Similarly, when the movable member 35 is formed of a conductor, the movable slice 43 and the movable slice 44 are electrically connected via the movable member 32. On the other hand, when the movable member 35 is formed of an insulator, a conducting member (such as a jumper wire) for electrically connecting the movable slice 43 and the movable slice 44 is required, and as a method of electrical connection, the movable slice 43 and the movable slice 44 can be integrally formed.

[0033] Since the movable members 31 to 36 and the movable shaft 2 need to slide, it is advisable to perform processing (such as PTFE fluorination) on the inner side surface of the movable members 31 to 36 and the outer side surface of the movable shaft 2 to reduce the sliding resistance and improve the lubricity. A partition member 38 formed of an annular insulator is provided between the movable member 33 and the movable member 34 to insulate between the movable slice 42 and the movable slice 43. The partition member 38 can move axially along the movable shaft 2 as the movable members 33 and 34 move.

[0034] As described later, the movable slices 41 to 44 are spring-like members formed by processing a metal plate, and are respectively installed between adjacent movable members 31 to 36. For example, the movable slices 41 to 44 are preferably installed in such a manner as to be sandwiched between the opposing steps of the adjacent movable members 31 to 36. In addition, when the movable slices 41 to 44 are installed in such a manner as to be inserted into the opposing grooves of the adjacent movable members 31 to 36, the movable slices 41 to 44 are not easily detached even when the movable members 31 to 36 move. The movable slices 41 to 44 are spring-like and protrude toward the outer peripheral side, and when not compressed in the axial direction, they apply a force in the direction of separating from the movable members 31 to 36 to create a gap 37 between the adjacent movable members 31 to 36.

[0035] A sealing material should be provided between the movable shaft 2 and the fixed member 1 so as to be able to maintain the airtightness of the internal space of the fixed member 1. An insulating gas (such as sulfur hexafluoride gas) should be sealed in the airtight internal space of the fixed member 1. By sealing the insulating gas in the internal space of the fixed member 1, the contacts can be arranged in the insulating gas, thereby suppressing arc discharge during connection switching and enabling switching of the contacts in a state where current is flowing.

[0036] Next, with reference to Figures 2 to 4 , the operation of the winding switching device of this embodiment will be described. Figure 2 is a cross-sectional view of the winding switching device, showing the process of switching from the first mode to the second mode. Figure 2 (A) of Figure 2 shows the first mode, Figure 2 (B) and Figure 2 (C) of Figure 3 show intermediate modes of the process of switching from the first mode to the second mode, Figure 4 (D) of

[0037] In the winding switching device of this embodiment, the relative relationship between the movable slices 41 to 44 and the terminals 51 to 54 is changed by the movement of the movable shaft 2, thereby changing the connection of the terminals 51 to 54. The movable shaft 2 can be moved manually or can be driven by an actuator as shown in Figure 10 .

[0038] In Figure 2In the first mode shown in (A) below, a force pushing from the right side of the illustration is applied to the movable shaft 2. The movable shaft 2 moves to the left, and the step at the end of the engaging groove of the movable shaft 2 abuts against the movable member 36 and pushes the movable member 36 to the left. At this time, the movable member 31 abuts against the fixed member 1. Therefore, the movable members 31 to 36 are sandwiched between the step at the end of the engaging groove of the movable shaft 2 and the fixed member 1, and are squeezed by the fixed member 1 and the movable shaft. The gap 37 between the movable members 31 to 36 disappears (or the gap 37 becomes smaller). The movable slices 41 to 44 are axially biased and become shorter than the free length. The protruding amount of the movable slices 41 to 44 in the outer peripheral direction increases, and the movable slices 41 to 44 are respectively squeezed against the terminals 51 to 54, and the movable slices 41 to 44 come into contact with the terminals 51 to 54 respectively (refer to Figure 3 (A)).

[0039] In the first mode, the movable slices 41 to 44 are respectively connected to the terminals 51 to 54. Therefore, the terminal 51 is electrically connected to the terminal 52, and the terminal 53 is electrically connected to the terminal 54.

[0040] In Figure 2 the intermediate mode shown in (B) below, the force applied to the movable shaft 2 disappears (or becomes weaker than the spring force of the movable slices 41 to 44), and the movable shaft 2 is released. At this time, the axial pressing force on the movable slices 41 to 44 disappears, and the movable slices 41 to 44 extend axially and tend to return to the free length, and a gap 37 is generated between the movable members 31 to 36. In addition, the protruding amounts of the movable slices 41 to 44 in the outer peripheral direction (terminals 51 to 54) are reduced, the movable slices 41 to 44 are separated from the terminals 51 to 54, and the movable slices 41 to 44 are no longer electrically connected to the terminals 51 to 54 (refer to Figure 3 (B)).

[0041] In Figure 2 the intermediate mode shown in (C) below, a force pulling to the right side of the illustration is applied to the movable shaft 2, and the movable shaft 2 moves to the right in a state where the movable slices 41 to 44 are separated from the terminals 51 to 54. When the movable shaft 2 moves, the movable slices 41 to 44 are separated from the terminals 51 to 54, so the electrical contact can be made non-sliding, thereby improving the reliability of the contact and extending the life of the contact.

[0042] In Figure 2In the second mode shown in (D), a force pulling toward the right side in the drawing is applied to the movable shaft 2. The movable shaft 2 moves further to the right side, and the step at the end of the engaging groove of the movable shaft 2 abuts against the movable member 31 and pushes the movable member 31 to the right side. At this time, the movable member 36 abuts against the fixed member 1. Therefore, the movable members 31 to 36 are clamped between the step at the end of the engaging groove of the movable shaft 2 and the fixed member 1, are squeezed by the fixed member 1 and the movable shaft, the gap 37 between the movable members 31 to 36 disappears (or the gap 37 becomes smaller), the protruding amounts of the movable slices 41 to 44 in the outer peripheral direction increase, and the movable slices 41 to 44 come into contact with the terminals 51 to 54 respectively. In the first mode, the movable slices 41 to 43 are respectively connected to the terminals 52 to 54, so the terminal 52 and the terminal 53 are electrically connected.

[0043] That is, when a force in the sliding direction greater than the spring force of the movable slice 41 is applied to the movable member 32 from the movable shaft 2 via the movable members 36 to 33, the gap 37 between the two movable members 31 and 32 disappears (or becomes smaller), the height of the movable slice 41 in the direction facing the terminal becomes higher, so the connection with the terminal 51 can be achieved. When the force in the sliding direction applied to the movable member 31 becomes smaller than the spring force of the movable slice 41, the spring force of the movable slice 41 causes the two movable members 31 and 32 connected by the movable slice 41 to slide in the separating direction. When the movable slice 41 elongates in the sliding direction, the height of the movable slice 41 in the direction facing the terminal becomes lower, and the terminal 51 and the movable slice 41 are separated. Thereafter, when the movable members 31 to 36 move in the sliding direction as the movable shaft 2 moves and a force in the sliding direction greater than the spring force of the movable slice 41 is applied to the movable member 31, the gap 37 between the two movable members 31 and 32 disappears (or becomes smaller), the height of the movable slice 41 in the direction facing the terminal becomes higher, so the connection with the terminal 52 can be achieved.

[0044] The winding switching device of the present embodiment changes the facing relationship between the movable slices 41 to 44 and the terminals 51 to 54 by the movement of the movable shaft 2. In the first mode, the terminal 51 and the terminal 52 are electrically connected, and the terminal 53 and the terminal 54 are electrically connected. As shown in Figure 4 (A), the first winding 61 and the second winding 62 are connected in parallel. In addition, in the second mode, the terminal 52 and the terminal 53 are electrically connected. As shown in Figure 4 (C), the first winding 61 and the second winding 62 are connected in series.

[0045] For example, in the case of a rotating electric machine for driving an electric vehicle, in a high-speed range, it is advisable to connect the first winding 61 and the second winding 62 in parallel in the first mode, and in a low-speed range, it is advisable to connect the first winding 61 and the second winding 62 in series in the second mode. The rotating electric machine for driving an electric vehicle generally has a low system efficiency in the low-speed range. By connecting the windings in series in the low-speed range to increase the voltage and halve the current, it is possible to reduce the conduction loss and switching loss of the power elements of the inverter, thereby improving the efficiency of the inverter and reducing power consumption.

[0046] Figure 5 It is a cross-sectional view showing the contact portion between the fixed member 1 and the movable member 31.

[0047] As described above, when a force is applied to push the movable shaft 2 from the right side in the drawing, the movable shaft 2 moves to the left and pushes the movable member 36 to the left, and the movable member 31 comes into contact with the fixed member 1. The portion where the movable member 31 contacts the fixed member 1 is preferably formed of a resin material, particularly preferably a soft resin material. For example, it is advisable to install a soft resin edge at the portion where the fixed member 1 contacts the movable member 31. Similarly, the portion where the movable member 36 contacts the fixed member 1 is preferably formed of a resin material, particularly preferably a soft resin material. The soft resin material forming a part of the fixed member 1 serves as a shock-absorbing material, which can reduce the sound generated when the fixed member 1 contacts the movable members 31 and 36, thereby reducing the operating sound of the winding switching device.

[0048] Next, with reference to Figures 6 to 9 , the movable slice 41 will be described. Figure 6 It is a view showing a plate-like member during the formation of the movable slice 41, Figure 7 It is a view showing a state in which the plate-like member shown in Figure 6 is wound into a circle in order to be installed as the movable slice 41, Figure 8 It is a schematic view of the movable slice 41 shown in Figure 7 viewed from the axial direction, Figure 9 It is a schematic cross-sectional view showing the position of the movable slice 41 of the winding switching device. Furthermore, although the movable slice 41 is described, the other movable slices 42 to 44 are also configured in the same way.

[0049] As described above, the movable slices 41 to 44 are formed into a spring shape by processing a metal plate. The movable slices 41 to 44 are formed by processing the metal plate into Figure 6 a shape as shown, with a plurality of central portions 411, end portions 412 forming both ends of the central portion 411, and a frame 413 connecting the plurality of end portions 412. The central portion 411 is formed in a flat plate shape, and the end portion 412 is formed with a width narrower than that of the central portion 411.

[0050] Thereafter, the movable slice 41 is likeFigure 7 , Figure 8 As shown, the end portion 412 is bent into a circular shape and attached to the movable members 31 to 36. In this state, when the movable slice 41 is axially pressed between the two frames 413, the central portion 411 deforms so as to protrude toward the outer periphery, thereby changing the height of the central portion 411. As Figure 9 shown, the height of the movable slice 41 increases due to the axial force applied, and it is pressed against the terminal 51 provided on the inner surface of the fixed member 1. The movable slice 41 comes into contact with the terminal 51 to conduct electricity. In particular, for the movable slice 41, the end portion 412 is formed thinner than the central portion 411. Even if the end portion 412 is bent, each central portion 411 can be formed into a flat bent shape (refer to Figure 8 ), so the axial rigidity is reduced and the axial springiness is increased. The central portion 411 can be deformed with a weaker force, thereby reducing the driving force of the winding switching device.

[0051] In addition, since a plurality of central portions 411 are arranged in a circular shape to form the movable slice 41, the deviation of the contact force between each central portion 411 and the terminal 51 can be suppressed. Further, since the central portion 411 presses the terminal 51 over the entire circumference, deformation of the terminal 51 caused by the contact of the central portion 411 does not occur, and the fixed member 1 can be formed thinner, thereby miniaturizing the winding switching device.

[0052] In addition, the central portion 411 is connected to the frame 413 via the narrow end portion 412. By adjusting the widths of the central portion 411 and the end portion 412, both the axial driving force of the movable shaft 2 and the contact pressure of the movable slices 41 to 44 against the terminals 51 to 54 can be appropriately adjusted.

[0053] In addition, the central portion 411 can be mass-produced by press working so that the shapes of the central portions 411 are consistent, improving the reliability of the winding switching device. Furthermore, the central portion 411 can be manufactured inexpensively, thereby reducing costs.

[0054] As described above, in the winding switching device of Embodiment 1, when the force applied in the sliding direction of the movable members 31 to 36 is made smaller than the spring force of the movable slices 41 to 44, the spring force of the movable slices 41 to 44 causes the two movable members 31 to 36 connected by the movable slices 41 to 44 to slide in the separating direction. When the movable slices 41 to 44 elongate in the sliding direction, the radial height of the movable slices 41 to 44 becomes lower, and the movable slices 41 to 44 are separated from the terminals 51 to 54. When a force in the sliding direction greater than the spring force of the movable slices 41 to 44 is applied to the movable members 31 to 36 through the movable shaft 2, the gap 37 between the adjacent movable members 31 to 36 disappears (or the gap 37 becomes smaller), the movable slices 41 to 44 become higher in the radial direction, the movable slices 41 to 44 come into contact with the terminals 51 to 54, and the movable slices 41 to 44 are connected to the terminals 51 to 54. Thus, by adopting a structure that slides in the direction of the movable shaft 2, the power in one direction causes the movable slices 41 to 44 to move in a state where the contacts are separated, so that the wear of the terminals 51 to 54 can be reduced. In addition, partial contact of the sliding portion can be eliminated and the wear of the sliding portion can be reduced.

[0055] <Embodiment 2>

[0056] Figure 10 FIG. is a cross-sectional view of the winding switching device of Embodiment 2.

[0057] The winding switching device of Embodiment 2 is provided with an actuator 70 that drives the movable shaft 2 of the winding switching device of Embodiment 1. The actuator 70 is composed of a coil 71 mounted on the fixed member 1 and a magnet 72 mounted on the movable shaft 2. When a direct current in a specified direction flows through the coil 71, the magnet 72 is pushed out by the magnetic force generated by the coil 71, and the movable shaft 2 is forced to the left, becoming the first mode. On the other hand, when a direct current in the reverse direction flows through the coil 71, the magnet 72 is pulled in by the magnetic force generated by the coil 71, so the movable shaft 2 is forced to the right, becoming the second mode.

[0058] In the winding switching device of Embodiment 2, by providing a driving unit (actuator 70) that moves the movable shaft 2, the system can be miniaturized compared to the case where the driving unit is provided outside the winding switching device. In addition, if a ball screw or the like is used for the driving unit, wear will occur and it will affect the connection of the contacts. However, in the winding switching device of Embodiment 2, the driving unit can also be made non-contact, which can improve the durability and achieve a long service life.

[0059] As described above, the switch of the winding switching device constituting the embodiment of the present invention includes a first terminal 51, a second terminal 52, a movable shaft 2, two movable members 31, 32, and a movable slice 41. The first terminal 51 and the second terminal 52 are adjacently mounted on a fixed member 1. The movable shaft 2 can move in a first direction and a second direction opposite to the first direction. The two movable members 31, 32 are mounted on the movable shaft 2. The movable slice 41 is connected to the two movable members 31, 32 and is biased in a direction in which the two movable members 31, 32 are separated from each other. This switch can switch between a first mode, an intermediate mode, and a second mode. In the first mode, the movement of the movable members 31, 32 in the first direction causes the movable member 32 (via other movable members 33 to 36) to be pushed by the fixed member 1, deforming the movable slice 41 so as to protrude in the direction of the terminal 51, and the movable slice 41 contacts the first terminal 51. In the intermediate mode, the deformation of the movable slice 41 caused by the movable members 31, 32 is released, and the movable slice 41 does not contact either the first terminal 51 or the second terminal 52. In the second mode, the movement of the movable member 31 in the second direction causes the movable member 31 to be pushed by the fixed member 1, deforming the movable slice 41 so as to protrude in the direction of the terminal 52, and the movable slice 41 contacts the second terminal 52. Therefore, it is possible to achieve the switching of the connection in a state where the terminals 51, 52 and the movable slice 41 are separated, reduce the contact resistance between the terminals 51, 52 and the movable slice 41 while reducing wear, improve the reliability of the switch, extend the lifespan, and achieve maintenance-free operation.

[0060] In addition, the winding switching device according to an embodiment of the present invention includes a first terminal 51, a second terminal 52, a third terminal 53, a fourth terminal 54, a movable shaft 2, a plurality of movable members 31 to 36, and a plurality of movable slices 41 to 44. The first terminal 51 and the second terminal 52 are connected to a winding 61, and the third terminal 53 and the fourth terminal 54 are connected to a second winding 62. The movable shaft 2 can move in a first direction and a second direction opposite to the first direction. The plurality of movable members 31 to 36 are mounted on the movable shaft 2. The plurality of movable slices 41 to 44 are connected to two of the plurality of movable members 31 to 36 and are biased in a direction in which the two movable members 31 to 36 are separated. The movable slices 41 to 44 include two first movable slices 41 and 42 that are electrically connected and two second movable slices 43 and 44 that are electrically connected. The winding switching device can switch between a first mode, an intermediate mode, and a second mode. In the first mode, the movement of the movable members 31 to 36 in the first direction causes the two first movable slices 41 and 42 to move to positions facing the first terminal 51 and the second terminal 52, respectively, and the two second movable slices 43 and 44 to move to positions facing the third terminal 53 and the fourth terminal 54, respectively. The movable member 36 contacts the fixed member 1, and the movable slices 41 to 44 are deformed so as to protrude in the direction of the terminals 51 to 54. The movable slices 41 to 44 contact the corresponding terminals 51 to 54, respectively. In the intermediate mode, the deformation of the movable slices 41 to 44 caused by the movable members 31 to 36 is released, and the movable slices 41 to 44 do not contact the terminals 51 to 54. In the second mode, the movement of the movable members 31 to 36 in the second direction causes the two first movable slices 41 and 42 to move to positions facing the second terminal 52 and the third terminal 53, respectively, and one of the second movable slices 43 and 44 to move to a position facing the fourth terminal 54. The movable member 31 contacts the fixed member 1, and the movable slices 41 to 44 are deformed so as to protrude in the direction of the terminals 51 to 54. The movable slices 41 to 44 contact the corresponding terminals 51 to 54, respectively. Therefore, the connection is switched in a state where the terminals 51, 52 and the movable slice 41 are separated, so that the contact resistance between the terminals 51, 52 and the movable slice 41 can be reduced while wear is reduced, and the reliability of the switch can be improved and the life can be extended. In addition, by switching the connection between the terminals, the wiring of the motor can be switched from series to parallel during the acceleration of the electric vehicle, so that the motor current can be reduced while ensuring the torque required in the low-speed range, and thus the inverter efficiency in the low-speed range can be improved and the power consumption can be improved.

[0061] In addition, the movable slice 41 is formed in an annular shape and disposed on the outer periphery of the movable shaft 2. The terminals 51 are formed in an annular shape on the outer periphery of the movable slice 41 so as to face each other in the radial direction. Therefore, the deviation of the contact force between each contact point (central portion 411) in the movable slice 41 and the terminal 51 can be reduced. In addition, the terminals 51 will not move due to the contact force, so the firmness of the fixing member 1 is not required, and the fixing member 1 can be miniaturized.

[0062] In addition, the movable slice 41 is composed of a plurality of central portions 411 and end portions 412 formed narrower than the central portions 411 on both sides of the central portions 411. Therefore, the driving force in the sliding direction and the contact pressure of the movable slice 41 can be adjusted according to the specifications of the winding switching device.

[0063] In addition, the central portion 411 has a shape that is relatively long in the axial direction and is connected to a frame 413 extending in the circumferential direction via the end portion 412. The movable slice 41 is formed by processing a metal plate. Therefore, for example, the movable slice 41 can be mass-produced by stamping, so that the deviation of the shape of the movable slice 41 is reduced, the reliability of the winding switching device can be improved, and the manufacturing cost can be reduced.

[0064] In addition, the central portion 411 is formed to have spring elasticity through bending processing of the metal plate, so the rigidity in the axial direction is reduced, and the driving force of the movable shaft 2 can be reduced.

[0065] In addition, in the contact portion 39 between the fixing member 1 and the movable members 31 and 36, at least one of them is formed of resin. Therefore, the impact when the fixing member 1 contacts the movable members 31 and 36 is alleviated by the resin, and the sound when the fixing member 1 contacts the movable members 31 and 36 (that is, the operating sound of the winding switching device) can be reduced.

[0066] In addition, the fixing member 1 is in a cylindrical shape that can seal the interior, and an insulating gas is sealed inside. Therefore, arc discharge during contact point switching can be prevented, and the contact points can be switched while current is flowing.

[0067] In addition, a coil 71 that generates a magnetic field by energization is mounted on the fixing member 1, and at least one magnet 72 is mounted on the movable shaft 2. The movable shaft 2 moves in the first direction by the electromagnetic force between the coil 71 and the magnet 72. Therefore, by disposing the actuator 70 that drives the movable shaft 2 inside the winding switching device, the device can be miniaturized.

[0068] Furthermore, the present invention includes various modifications and equivalent configurations within the scope of the appended claims, and is not limited to the embodiments described above. For example, the embodiments described above are detailed descriptions for explaining the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the configurations described. In addition, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. In addition, the configuration of another embodiment can be added to the configuration of one embodiment. In addition, addition, deletion, or replacement of other configurations can be performed on a part of the configuration of each embodiment.

[0069] Symbol Explanation

[0070] 1... fixing member

[0071] 2... movable shaft

[0072] 31 - 36... movable members

[0073] 37... gap

[0074] 38... separator

[0075] 41 - 44... movable slices

[0076] 51 - 54... terminals

[0077] 61... first winding

[0078] 62... second winding

[0079] 70... actuator

[0080] 71... coil

[0081] 72... magnet

[0082] 411... central part

[0083] 412... end part

[0084] 413... frame.

Claims

1. A switch that switches its electrical connection state, characterized in that, Comprising: A first terminal to a fourth terminal, which are adjacently mounted on a fixing member; A movable shaft that can move along a first direction and a second direction opposite to the first direction; A plurality of movable members, which are mounted on the movable shaft; And A plurality of movable slices, which are connected to two of the plurality of movable members and apply a force in a direction in which the two movable members are separated; This switch can switch between a first mode, an intermediate mode, and a second mode by the movement of the movable shaft; In the first mode, the movement of the movable member in the first direction causes the movable member to be pressed by the fixing member, and the movable slice is deformed in a manner of protruding toward the terminal, so that the movable slice contacts the first terminal to the fourth terminal respectively; In the intermediate mode, the deformation of the movable slice caused by the movable member is released, and the movable slice does not contact the first terminal and the second terminal; In the second mode, the movement of the movable member in the second direction causes the movable member to be pressed by the fixing member, and the movable slice is deformed in a manner of protruding toward the terminal, so that the movable slice contacts the second terminal to the fourth terminal respectively.

2. A winding switching device that switches the connection of windings, characterized in that, Comprising: A first terminal and a second terminal, which are connected to a first winding and are adjacently mounted on a fixing member; A third terminal and a fourth terminal, which are connected to a second winding and are adjacently mounted on a fixing member; A movable shaft that can move along a first direction and a second direction opposite to the first direction; A plurality of movable members, which are mounted on the movable shaft; And A plurality of movable slices, which are connected to two of the plurality of movable members and apply a force in a direction in which the two movable members are separated; The movable slice includes two first movable slices that are electrically connected and two second movable slices that are electrically connected; This winding switching device can switch between a first mode, an intermediate mode, and a second mode by the movement of the movable shaft; In the first mode, the movement of the movable member in the first direction causes the two first movable slices to each move to a position facing the first terminal and the second terminal, and the two second movable slices to each move to a position facing the third terminal and the fourth terminal. The movable member contacts the fixing member, and the movable slice is deformed in a manner of protruding toward the terminal, so that the movable slice contacts the facing terminal respectively; In the intermediate mode, the deformation of the movable slice caused by the movable member is released, and the movable slice does not contact the terminal; In the second mode, the movement of the movable member in the second direction causes the two first movable slices to each move to a position facing the second terminal and the third terminal, and one of the second movable slices to move to a position facing the fourth terminal. The movable member contacts the fixing member, and the movable slice is deformed in a manner of protruding toward the terminal, so that the movable slice contacts the facing terminal respectively.

3. The winding switching device according to claim 2, wherein The movable slice is formed in an annular shape and disposed on the outer periphery of the movable shaft. The terminals are formed in an annular shape on the outer periphery of the movable slice so as to face each other in the radial direction.

4. The winding switching device according to claim 2, wherein: The movable slice is composed of a plurality of central portions and end portions formed on both sides of each central portion and narrower than the central portion.

5. The winding switching device according to claim 4, wherein: Each of the central portions has a shape that is longer in the axial direction and is connected to a frame extending in the circumferential direction via the end portions. The movable slice is formed by processing a metal plate.

6. The winding switching device according to claim 5, wherein: The central portion is formed to have spring elasticity by bending the metal plate.

7. The winding switching device according to claim 2, wherein: At least one of the contact portions between the fixed member and the movable member is formed of resin.

8. The winding switching device according to claim 2, wherein: The fixed member is in a cylindrical shape capable of sealing the interior, and an insulating gas is enclosed therein.

9. The winding switching device according to claim 2, wherein: A coil that generates a magnetic field by energization is mounted on the fixed member. At least one magnet is mounted on the movable shaft. The movable shaft moves in the first direction by the electromagnetic force between the coil and the magnet.

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