JP2003036776A - Contact switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the configuration of a device, miniaturize and reduce the weight of the device, and reduce the cost required for constituting the device, by reducing the number of parts for a high-voltage part related to a pre-charge operation at the start of electrification. SOLUTION: A contact switch 10 comprises a pair of terminal electrodes 21 and 21, a movable contact 26 abuttable to the pair of terminal electrodes 21 and 21, and a shaft spring 28 and an electromagnetic coil 29 which reciprocate the pair of terminal electrodes 21 and 21 against the movable contact 26. The pair of terminal electrodes 21 and 21 are provided with movable resistance contacts 23 and 23 which contact the movable point 26 before the pair of terminal electrodes 21 and 21 abut the movable contact 26. The movable resistance contact 23 is so connected to the terminal electrode 21 through a spring 22 as to protrude toward the movable contact 26, while the movable resistance contact 23 advances/retracts from the inside of the terminal electrode 21 under the elastic deformation of the spring 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact switchgear for protecting high-voltage electrical components mounted on, for example, electric vehicles and hybrid vehicles.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram of a motor control device 1 according to an example of the prior art. The motor control device 1 includes a motor 2, a power source 4 for exchanging electric energy with the motor 2 via an inverter 3 having a smoothing capacitor 3a, a main switch 5a and a main fuse 5b.
And a main relay 6 provided on the output side of the power source 4 for power
And a pre-charge relay 7 and a pre-charge resistor 8 connected in parallel to the main relay 6, a main relay driver 9a and a pre-charge relay driver 9b.

When the current supplied from the power source 4 to the electric load of the motor 3 is large, the main relay 6 is released and the precharge relay 7 is closed so that the current flows through the precharge resistor 8. Controlled by. That is, when the voltage difference between the voltage of the power source 4 for driving and the voltage between the terminals of the smoothing capacitor 3a is large, such as when the inverter 3 is started, the precharge for gradually charging the smoothing capacitor 3a via the precharge resistor 8. When the operation is performed and the charging is completed, the main relay 6 is turned “ON” to directly energize the power source 4 for power supply, thereby suppressing an excessive inrush current. This prevents the contacts of the main relay 6 from being welded and the smoothing capacitor 3a from being damaged.

[0004]

By the way, in the motor control device 1 according to the above-mentioned prior art, the main relay 6 is used.
And a precharge relay 7 and a precharge resistor 8
If the device is configured to include the relay drivers 9a and 9b, the cost will increase. Furthermore, for example, when the motor control device 1 is mounted in an electric vehicle, a hybrid vehicle, or the like, an excessive rush current may flow,
If the precharge relay 7 corresponding to a large current is provided, the cost will increase. Moreover, since the weight of the precharge relay 7 is increased by supporting a large current, it becomes difficult to reduce the weight and size of the device. Further, each relay 6 and 7 needs to be independently controlled, which causes a problem that control processing becomes complicated.

The present invention has been made in view of the above circumstances, and simplifies the structure of the device by reducing the number of high-voltage parts involved in the precharge operation at the start of energization, thereby contributing to weight reduction and size reduction. It is an object of the present invention to provide a contact switchgear capable of reducing the cost required for the configuration of the device.

[0006]

In order to solve the above problems and achieve the above object, a contact opening / closing device according to the present invention comprises a pair of terminal electrodes (for example, in the embodiments described later). Terminal electrodes 21, 21), a movable contact capable of abutting the pair of terminal electrodes (for example, a movable contact 26 in an embodiment described later), and a movable contact for moving the movable contact forward and backward with respect to the pair of terminal electrodes. Contact drive means (for example, the shaft spring 2 in the embodiment described later)
8 and an electromagnetic coil 29 and a driver 48), which is provided on either one of the pair of terminal electrodes and the movable contact, and is in contact with the pair of terminal electrodes and the movable contact. Prior to the above, a movable resistance contact (for example, movable resistance contacts 23, 23 in the embodiments described later) that comes into contact with the other of the pair of terminal electrodes and the movable contact is provided.

According to the contact opening / closing device having the above-mentioned structure, when the movable contact is moved toward the pair of terminal electrodes by the movable contact drive means, first, the movable resistance provided on either one of the pair of terminal electrodes and the movable contact. The contact comes into contact with the other of the pair of terminal electrodes and the movable contact. As a result, a current flows between the pair of terminal electrodes and the movable contact via the movable resistance contact. Then, when the movable contact is further moved toward the pair of terminal electrodes, the pair of terminal electrodes and the movable contact come into contact with each other, and the current flows directly without passing through the movable resistance contact.

That is, for example, a main relay provided on the output side of a DC power source for supplying electric power to an inverter circuit has a function of short-circuiting a pair of terminal electrodes by a movable contact, and is connected in parallel to the main relay, for example. A single contact switching device realizes the function of controlling the inrush current by flowing a current between a pair of terminal electrodes through a resistor at the start of energization such as a precharge relay and a precharge resistor. be able to. As a result, by reducing the number of high-voltage components, the configuration of the device can be simplified, contributing to weight reduction and downsizing, and the cost required for the configuration of the device can be reduced.

Further, in the contact opening / closing device of the present invention as defined in claim 2, one of the pair of terminal electrodes and the movable contact accommodates the movable resistance contact in such a manner that the movable resistance contact can be retracted and retracted (for example, described later). The inside) of the terminal electrode 21 in the embodiment. According to the contact opening / closing device having the above-mentioned configuration, the movable resistance contact is provided so as to project from either one of the pair of terminal electrodes and the movable contact toward the other of the pair of terminal electrodes and the movable contact. Prior to the contact between the terminal electrode and the movable contact, the movable resistance contact can be brought into contact with the other of the pair of terminal electrodes and the movable contact. Moreover, when the movable resistance contact is accommodated in the accommodating portion provided on either one of the pair of terminal electrodes and the movable contact, the pair of terminal electrodes and the movable contact can be directly brought into contact with each other without passing through the movable resistance contact. it can. This makes it possible to easily change the energization state between the pair of terminal electrodes simply by moving the movable contact forward and backward with respect to the pair of terminal electrodes.

Further, in the contact opening / closing device of the present invention as defined in claim 3, the movable resistance contact is provided with an elastic member (eg,
It is characterized in that it is provided on either one of the pair of terminal electrodes and the movable contact via a spring 22) in an embodiment described later. According to the contact opening / closing device having the above-described configuration, for example, elastic deformation of an elastic member such as a coil spring causes the movable resistance contact to project from either one of the pair of terminal electrodes and the movable contact, and the pair of terminal electrodes and the movable contact. It can be housed inside either one.
For example, when the movable contact is moved toward the pair of terminal electrodes by the movable contact driving means, the movable resistance contact provided on either one of the pair of terminal electrodes and the movable contact does not correspond to one of the pair of terminal electrodes and the movable contact. Or it is in a state of protruding toward the other.

When the movable resistance contact comes into contact with the other of the pair of terminal electrodes and the movable contact as the movable contact moves, the elastic member elastically compresses, and the movable resistance contact becomes the pair of terminal electrode and the movable contact. It will gradually be housed inside one of them. Then, when the movable resistance contact is completely housed inside either one of the pair of terminal electrodes and the movable contact, the pair of terminal electrodes and the movable contact come into contact with each other, and the current flows directly without passing through the movable resistance contact. Comes to flow.
This makes it possible to easily change the energized state between the pair of terminal electrodes simply by moving the movable contact forward and backward with respect to the pair of terminal electrodes and elastically deforming the elastic member.

Further, in the contact opening / closing device of the present invention as defined in claim 4, the movable contact driving means includes a driving electromagnetic coil (for example, an electromagnetic coil 29 in an embodiment described later) and the electromagnetic coil. And an operating position changing means (for example, a driver 48 in an embodiment to be described later) for moving the movable contact to an appropriate operating position by controlling the energization ratio. According to the contact opening / closing device having the above-described configuration, for example, in the movable contact driving means including a linear solenoid or the like in which the plunger makes a linear motion in the electromagnetic coil, it is provided in the plunger or the like by controlling the energization rate to the electromagnetic coil. The movement of the movable contact can be controlled. Accordingly, the movable contact can be easily moved back and forth with respect to the pair of terminal electrodes.

Further, in the contact opening / closing device of the present invention as defined in claim 5, the operating position changing means sets the energization rate to the electromagnetic coil to a predetermined value for a predetermined time (for example, in an embodiment described later). , After holding the movable contact 26 at the value of the energization ratio MR required to move the distance Yb against the restoring force of the shaft spring 28, a value larger than this predetermined value (for example, in the embodiment described later). , The value of the energization ratio MR required for the movable contact 26 to move by the distance Yc against the restoring force of the shaft spring 28).

According to the contact opening / closing device having the above-mentioned structure, the movable resistance contact provided with the predetermined value of the energization rate to the electromagnetic coil is provided on either one of the pair of terminal electrodes and the movable contact. Set it to a value corresponding to the operating position of the movable contact when it comes into contact with either of the other contacts. Then, by holding this predetermined value for a predetermined time, it is possible to suppress the inrush current by causing a current to flow between the pair of terminal electrodes and the movable contact through the movable resistance contact, and for example, to energize the inverter circuit. The precharge operation can be easily performed without damaging the circuit components at the time of starting. Next, if the duty factor is changed to a value larger than a predetermined value and the movable contact is moved toward the pair of terminal electrodes,
The pair of terminal electrodes and the movable contact can be directly brought into contact with each other without passing through the movable resistance contact, and for example, the power can be directly supplied from the power source to the inverter circuit after the precharge operation for the inverter circuit is completed.

The above-mentioned contact switching device of the present invention is provided between the inverter circuit (for example, the inverter 44 in the embodiment described later) and the DC power supply (for example, the power supply 45, 45 in the embodiment described later). It is connected by wiring. According to the contact opening / closing device configured as described above, for example, an inverter provided for smoothly driving a motor when converting the DC power supplied from the DC power supply into AC power by the inverter and supplying the AC power to the motor or the like. It is possible to prevent an excessive inrush current from flowing into the smoothing capacitor and to prevent the smoothing capacitor from being damaged. That is, when the voltage difference between the DC power supply voltage and the smoothing capacitor terminal voltage is large, such as when starting the inverter, the smoothing capacitor is gradually charged (pre-charged) via the movable resistance contact, and charging is completed. In this case, the direct current is supplied from the direct current power supply without passing through the movable resistance contact.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a contact switching device of the present invention will be described below with reference to the accompanying drawings. 1 is a side sectional view showing a configuration of a contact opening / closing device 10 according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a motor control device 41 including the contact opening / closing device 10 shown in FIG. The contact opening / closing device 10 according to the present embodiment is a motor control device 41 mounted on, for example, an electric vehicle or a hybrid vehicle.
1, a pair of terminal electrodes 21 and 21, springs 22 and 22, movable resistance contacts 23 and 23, insert bolts 24 and 24, magnets 25 and 25, and movable contacts, as shown in FIG. 26, the under plate 27, the shaft spring 28, and the electromagnetic coil 29.
, Core 30, yoke 31, upper case 32
, Lower case 33, shaft (plunger) 34
, The outer mold 35, and a driver 48 described later.
And is configured.

As shown in FIG. 1, in the contact switchgear 10, for example, the openings of an upper case 32 and a lower case 33, which are formed of an electrically insulating material and have a bottomed cylindrical shape, are arranged to face each other. And, for partitioning the internal space of each case 32, 33 between both openings,
For example, a substantially disk-shaped under plate 27 is provided, and the outer peripheral portion of the under plate 27 is fixed so as to be sandwiched by both openings from both sides. Outer peripheral portions of the upper case 32 and the lower case 33 are covered with an outer mold 35, and, for example, two magnets 25 are arranged between the upper case 32 and the outer mold 35 so as to face each other.

A pair of terminal electrodes 21 and 21 which can be connected to an external electric circuit and are spaced apart from each other are formed in, for example, a substantially cylindrical shape and penetrate the outer mold 35 and the bottom of the upper case 32. It is fixed at. That is, one end 21 a of the terminal electrode 21 projects into the upper case 32, and the other end thereof is the outer mold 35.
Protruding toward the outside of. A screw thread 21b is provided on the inner peripheral surface on the other end side of the terminal electrode 21, and the screw thread 21b is provided.
An insert bolt 24 is screwed onto the. Further, on the inner peripheral surface on the one end 21a side of the terminal electrode 21, there is provided a locking portion 21c having a diameter reduced by one step from the inner peripheral surface.

The insert bolt 24 has a spring 22.
One end is fixed, and the other end of the spring 22 is connected to a movable resistance contact 23 which is slidable inside the one end 21a side of the terminal electrode 21. The movable resistance contact 23 is formed, for example, in a substantially cylindrical shape, and the terminal electrode 2 is formed on the outer peripheral surface on one end side of the movable resistance contact 23 to which the spring 22 is connected.
An engaging portion 23a that engages with the first engaging portion 21c is provided. That is, when the engaging portion 23 a of the movable resistance contact 23 engages with the inward protruding portion (stepped portion) of the locking portion 21 c of the terminal electrode 21, the movement of the movable resistance contact 23 in the terminal electrode 21. Is regulated, and the movable resistance contact 2
3 is the upper case 3 from one end 21a side of the terminal electrode 21.
It is prevented from slipping out of the inside of 2.

Further, the engaging portion 23a of the movable resistance contact 23
Is engaged with the locking portion 21 c of the terminal electrode 21, the other end 23 b of the movable resistance contact 23 is connected to the one end 21 of the terminal electrode 21.
It is set so as to protrude toward the inside of the upper case 32 from a. Further, the movable resistance contact 23 is formed so as to be completely housed inside the terminal electrode 21 by elastic compression of the spring 22.

Inside the upper case 32, there is provided a movable contact 26 capable of contacting the pair of terminal electrodes 21, 21 and the movable resistance contacts 23, 23. For example, the movable contact 26 formed in a substantially disc shape passes through a through hole 27 a provided in the under plate 27 and the upper case 32.
Is connected to one end of a shaft 34 protruding inside.

Inside the lower case 33, for example, the shaft 34 forms a solenoid such as a linear solenoid that linearly moves in the electromagnetic coil 29 in the axial direction.
9, a yoke 31 including the electromagnetic coil 29, a shaft 34 penetrating the electromagnetic coil 29, and the electromagnetic coil 2
The core 3 connected to the other end of the shaft 34 protruding from 9
0 and are provided. Furthermore, the under plate 27
Between the yoke and the yoke 31, the shaft 34 is provided with, for example, a disk-shaped spring locking portion 34a, one end of the shaft spring 28 is connected to the spring locking portion 34a, and the other end of the shaft spring 28 is connected. It is connected to the under plate 27.

Here, the shaft 34 is the electromagnetic coil 29.
The core 30 is attracted to the inside of the yoke 31 by the magnetic attraction force generated by the excitation of the magnet, and the core 30 moves from the lower case 33 toward the upper case 32. It moves toward the terminal electrodes 21, 21 and the movable resistance contacts 23, 23 so as to be close to each other. On the other hand, when the excitation of the electromagnetic coil 29 is stopped or the magnitude of the excitation is weakened, the shaft spring 28 elastically compresses between the under plate 27 and the spring locking portion 34a, and the shaft 34 is moved from the upper case 32 to the lower case. A force for moving the movable contact 26 toward 33 is generated, and the movable contact 26 moves in a direction away from the pair of terminal electrodes 21, 21 and the movable resistance contacts 23, 23.

That is, when the electromagnetic coil 29 is excited,
The shaft 34 can be stopped at a predetermined position where the magnetic attraction force and the restoring force of the shaft spring 28 are balanced, and the movable contact 26, the pair of terminal electrodes 21 and 21 and the movable contact 26 can be moved according to the exciting current to the electromagnetic coil 29. Positioning relative to the resistance contacts 23, 23 is possible. In addition, when the electromagnetic coil 29 is not excited, the movable contact 26 connected to one end of the shaft 34 is
The movable resistance contact 23 is set to be separated from the other end 23b by a predetermined distance.

Further, as shown in FIG. 2, for example, the motor control device 4 having the contact switching device 10 according to the present embodiment.
Reference numeral 1 denotes a motor 42, two power sources 45 and 45 for exchanging electric energy with the motor 42 via an inverter 44 having a smoothing capacitor 43, and two power sources 45 and 45 connected in series. A main switch 46 and a main fuse 47 provided between the power supply 45 and the power supply 45, and a driver 48 for driving the electromagnetic coil 29 of the contact opening / closing device 10 provided on the output side of the power supplies 45, 45.

The motor 42 has, for example, three phases (U phase, V phase,
It has respective input / output terminals U, V, W of W phase). The inverter 44 is, for example, a PWM inverter based on pulse width modulation (PWM), and is configured to include a bridge circuit 44a that is bridge-connected using a plurality of switching elements, and a smoothing capacitor 43. And
For example, when the motor 42 operates as an electric motor, the inverter 44 converts a direct current input from the power sources 45, 45 via the direct current input / output terminal 44D and the ground terminal 44G into an alternating current, and converts this alternating current. It is sent to each input / output terminal U, V, W of the motor 42.

The bridge circuit 44a includes transistors SU1, SU2, SV1, S which are a plurality of switching elements.
It is configured to include V2, SW1 and SW2. These transistors SU1, SU2, SV1, SV2, SW
Diodes KU1, KU2, KV1, KV2, KW1 and KW are provided between the collector and the emitter of SW1 and SW2, respectively.
2 are arranged and each transistor SU1, SU2, SV
1, the anodes of the diodes KU1, KU2, KV1, KV2, KW1 and KW2 are connected to the emitters of SV2, SW1 and SW2, and the diodes K to the collectors of the diodes K1 and KV2.
The cathodes of U1, KU2, KV1, KV2, KW1 and KW2 are connected.

The collectors of the transistors SU1, SV1, SW1 are all connected to the DC input / output terminal 44D. The emitter of the transistor SU1 is the transistor SU
2, the emitter of the transistor SV1 is connected to the collector of the transistor SV2, and the emitter of the transistor SW1 is connected to the collector of the transistor SW2. Each transistor SU2, SV2
The emitters of SW2 are all connected to the ground terminal 44G. The U-phase input / output terminal U is connected to the emitter of the transistor SU1 and the collector of the transistor SU2, the V-phase input / output terminal V is connected to the emitter of the transistor SV1 and the collector of the transistor SV2, and the W-phase input / output terminal W is a transistor. It is connected to the emitter of SW1 and the collector of transistor SW2. The smoothing capacitor 43 is connected between the DC input / output terminal 44D and the ground terminal 44G.

The contact opening / closing device 10 according to this embodiment has the above-mentioned structure. Next, the operation of the contact opening / closing device 10 will be described with reference to the accompanying drawings. 3 to 5 are side sectional views of the contact opening / closing device 10 showing the operating position of the movable contact 26 that changes according to the energization rate to the electromagnetic coil 29, and FIG. 6 is a view between the terminals of the pair of terminal electrodes 21 and 21. Voltage V
mr and a current Imr between the pair of terminal electrodes 21 and 21,
FIG. 7 is a graph showing a change with respect to the electromagnetic coil 29 in a duty ratio MR, and FIG.
9 is a graph showing a change in the operating position of the movable contact 26 in accordance with the above, and FIG. 8 is a graph showing a change in ON / OFF in pulse width modulation in the driver 48.

First, when the energization ratio MR to the electromagnetic coil 29 is zero, for example, in the operating position (moving contact operating position) A shown in FIG. 6, the moving contact 26 moves the moving resistance as shown in FIG. It is in a state of being separated from the other end 23b of the contact point 23 by a predetermined distance, and the inter-terminal voltage Vmr of the pair of terminal electrodes 21 and 21 and the current Imr between the terminal electrodes 21 and 21.
Are both zero. The duty ratio MR to the electromagnetic coil 29 is, for example, as shown in FIG. 8, a ratio of the pulse width b in the ON state in the pulse width modulation in the driver 48 to the pulse width a for one period {(b / a ) × 100}. The terminal voltage Vmr of the terminal electrodes 21 and 21 is the difference (Vb-V) between the power supply voltage Vb of the power supply 45, 45 and the terminal voltage Vc of the smoothing capacitor 43.
It is defined by c).

Next, for example, in the operating position (moving contact operating position) B shown in FIG. 6, the energization ratio MR to the electromagnetic coil 29 is set to a predetermined value (for example, 60) for a predetermined time T1.
%), The shaft 34 moves from the lower case 33 toward the upper case 32 by the magnetic attraction force generated by the excitation of the electromagnetic coil 29. Then, as shown in FIG. 4, the movable contact 26 connected to one end of the shaft 34 is connected to the other end 23 of the movable resistance contacts 23, 23.
The magnetic attraction force of the electromagnetic coil 29 and the restoring force of the shaft spring 28 balance with each other in a state of being in contact with b and 23b, and the shaft 34 stands still. That is, for example, in FIG.
As shown in FIG.
For the distance (moving contact lift amount) Yb to reach the other ends 23b, 23b of the moving contacts 2, 23
6 is the distance Yb against the restoring force of the shaft spring 28.
Value of the energization ratio MR required to move only (for example, 60
%) Is set.

In this case, for example, as shown in FIG. 6, a current flows between the pair of terminal electrodes 21, 21 and the movable contact 26 via the movable resistance contacts 23, 23, and the inverter 44
The smoothing capacitor 43 is gradually charged. As a result, the inter-terminal voltage Vc of the smoothing capacitor 43 gradually increases, and the inter-terminal voltage Vmr of the pair of terminal electrodes 21, 21 and the current Imr between the terminal electrodes 21, 21 change to a decreasing tendency.

Next, when the inter-terminal voltage Vmr of the terminal electrodes 21 and 21 becomes equal to or lower than a predetermined precharge end voltage VmrE, as in the operation position (moving contact operation position) C shown in FIG. The duty ratio MR for the coil 29 is set to a value larger than a predetermined value (for example, 90 to 100%). As a result, the magnetic attraction force generated by the excitation of the electromagnetic coil 29 causes the shaft 34 to move further.
It moves from the lower case 33 toward the upper case 32. Then, as shown in FIG. 5, the movable contact 26 connected to one end of the shaft 34 pushes the movable resistance contacts 23, 23 into the insides of the terminal electrodes 21, 21, and the terminal electrodes 21,
In a state of being in contact with one ends 21a, 21a of 21, the magnetic attraction force of the electromagnetic coil 29 and the restoring force of the shaft spring 28 are balanced, and the shaft 34 stands still. That is, for example, as shown in FIG. 7, the movable contact 26 is actually moved to the shaft with respect to the distance (moving contact lift amount) Yc until the movable contact 26 reaches the ends 21a, 21a of the terminal electrodes 21, 21 in advance. The value (eg, 90 to 100%) of the energization ratio MR required to move the distance Yc against the restoring force of the spring 28 is set.

In this case, for example, as shown in FIG. 6, a current flows between the pair of terminal electrodes 21, 21 and the movable contact 26 without passing through the movable resistance contacts 23, 23, and the inverter 4
4, the power is directly supplied from the power sources 45, 45.

As described above, according to the contact opening / closing device 10 of the present embodiment, the pair of terminal electrodes 21, 21 are connected to the movable contact 26 on the output side of the power supply 45, 45 for supplying electric power to the inverter 44. The single contact switching device 10 realizes the function of simply short-circuiting by means of the single contact switching device 10 and the function of passing a current between the pair of terminal electrodes 21, 21 via the movable resistance contacts 23, 23 when the energization of the inverter 44 is started. can do. As a result, by reducing the number of high-voltage components, the configuration of the device can be simplified, contributing to weight reduction and downsizing, and the cost required for the configuration of the device can be reduced. Moreover, the single contact switching device 10
On the other hand, since only the single driver 48 is required, it is possible to reduce the cost required for the configuration of the device and prevent the energization control process for the electromagnetic coil 29 from becoming complicated. .

In the present embodiment, the movable resistance contact 23 is provided so as to be able to project into and retract from the inside of the terminal electrode 21, but for example, the movable contact 26 is provided with concave portions capable of accommodating the movable resistance contacts 23 and 23. Alternatively, the movable resistance contacts 23, 23 may be provided so as to be retractable in and from these recesses.

[0037]

As described above, according to the contact switching device of the present invention as set forth in claim 1, the function of short-circuiting the pair of terminal electrodes by the movable contact and the function between the pair of terminal electrodes at the start of energization or the like are provided. It is possible to realize the function of passing a current through the resistor to suppress the inrush current with a single contact switching device. As a result, by reducing the number of high-voltage components, the configuration of the device can be simplified, contributing to weight reduction and downsizing, and the cost required for the configuration of the device can be reduced. Further, according to the contact opening / closing device of the present invention as set forth in claim 2, it is possible to easily change the energization state between the pair of terminal electrodes only by moving the movable contact forward and backward with respect to the pair of terminal electrodes. Further, according to the contact opening / closing device of the third aspect of the present invention, the movable contact is moved forward and backward with respect to the pair of terminal electrodes, and the elastic member is elastically deformed.
The energization state between the pair of terminal electrodes can be easily changed.

Further, according to the contact opening / closing device of the fourth aspect of the present invention, the movable contact can be easily advanced and retracted with respect to the pair of terminal electrodes. Further, according to the contact opening / closing device of the fifth aspect of the present invention, the energization state between the pair of terminal electrodes can be easily changed by changing the energization rate to the electromagnetic coil.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a configuration of a contact opening / closing device according to an embodiment of the present invention.

2 is a configuration diagram of a motor control device including the contact opening / closing device shown in FIG. 1. FIG.

FIG. 3 is a side cross-sectional view of the contact opening / closing device showing the operating position of the movable contact that changes according to the energization rate to the electromagnetic coil.

FIG. 4 is a side cross-sectional view of the contact opening / closing device showing the operating position of the movable contact that changes according to the energization rate of the electromagnetic coil.

FIG. 5 is a side cross-sectional view of the contact opening / closing device showing the operating position of the movable contact that changes according to the energization rate of the electromagnetic coil.

FIG. 6 is a graph showing changes in inter-terminal voltage Vmr between a pair of terminal electrodes, current Imr between a pair of terminal electrodes, and duty ratio MR for an electromagnetic coil.

FIG. 7 is a graph showing a change in the operating position of the movable contact according to the energization rate MR with respect to the electromagnetic coil.

FIG. 8: ON / OFF in pulse width modulation in driver
It is a graph which shows change of OFF.

FIG. 9 is a configuration diagram of a motor control device according to an example of a conventional technique.

[Explanation of symbols]

10 Contact Switching Device 21 Terminal Electrode 22 Spring (Elastic Member) 23 Movable Resistance Contact 26 Movable Contact 28 Shaft Spring (Movable Contact Driving Means) 29 Electromagnetic Coil (Movable Contact Driving Means) 44 Inverter 45 Power Source (DC Power Source) 48 Driver (Movable contact driving means, operating position changing means)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01R 13/629 H01R 13/629 (72) Inventor Hiromichi Imai 1-4-1, Chuo, Wako-shi, Saitama Stock Incorporated in Honda R & D Co., Ltd. (72) Inventor Koichi Hasegawa 1-4-1 Chuo, Wako, Saitama Stock company Honda R & D institute F-term (reference) 5E021 FB20 FC14 FC40 HA05 5G057 AA19 KK05 YY13 5H115 PA08 PG04 PI13 PU02 PU21 SE03 TO12 TU02 TZ04 TZ09

Claims (5)

[Claims] 1. A contact opening / closing device comprising a pair of terminal electrodes, a movable contact capable of abutting on the pair of terminal electrodes, and a movable contact drive means for moving the movable contact forward and backward with respect to the pair of terminal electrodes. Which is provided on any one of the pair of terminal electrodes and the movable contact, and prior to contact between the pair of terminal electrodes and the movable contact, either of the pair of terminal electrodes and the movable contact. A contact opening / closing device comprising a movable resistance contact that contacts the other. 2. The contact opening / closing device according to claim 1, wherein any one of the pair of terminal electrodes and the movable contact has an accommodating portion that accommodates the movable resistance contact so as to be retractable. 3. The contact opening / closing device according to claim 2, wherein the movable resistance contact is provided on one of the pair of terminal electrodes and the movable contact via an elastic member. 4. The movable contact driving means includes an electromagnetic coil for driving, and an operating position changing means for moving the movable contact to an appropriate operating position by controlling the energization rate of the electromagnetic coil. Claims 1 to 3 characterized in that
The contact switchgear according to any one of 1. 5. The operating position changing means holds the energization rate to the electromagnetic coil at a predetermined value for a predetermined time and then changes the value to a value larger than the predetermined value. The contact switchgear according to.