JP2001074611A - Tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a noise component contained in an electric signal acquired from a material to be tested by recovering the component generated from an inverter in a tester having the inverter. SOLUTION: This tester for an automobile comprises a torque detector 11 coupled to an automotive engine 10 of a material to be tested, an AC dynamometer 12, an inverter 13, and an AC power source 14. A three-phase output wire 29 for connecting the dynamometer 12 to the inverter 13 and an earth wire 30 for returning the component from the dynamometer 12 are wound on a common-mode choke coil 34 near the inverter 13 in the same number of turns in the same direction. Thus, an inductance of the wire 30 ideally becomes zero, and the component can be recovered from the dynamometer 12 to the inverter 13 through the wire 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test apparatus provided with a power conversion device such as an inverter, for acquiring an electric signal from an automobile part or the like and performing a test such as a durability test.

[0002]

2. Description of the Related Art In recent years, an AC (alternating current) system using an inverter has become mainstream as a dynamometer used for a test apparatus for a vehicle. As a switching element constituting an inverter used in such an automobile test apparatus, not only a bipolar transistor but also an IGBT (Insula) capable of switching at a higher speed.
tedGate Bipolar Transistor) may also be used.

[0003]

In an automobile test apparatus, a strain gauge sensor, a temperature sensor, and the like are used in order to grasp characteristics of an engine to be tested, an electric vehicle motor, a transmission, and the like. Obtains a weak electric signal from an automobile part or the like to grasp the characteristics and the like of each part. However,
The noise current flowing out of the AC dynamometer having the above-described inverter may affect an electric signal obtained by a strain sensor or the like, and may cause a problem that an accurate test cannot be performed.

[0004] The present invention has been made in view of the above circumstances, and in a test apparatus having a power converter,
It is an object of the present invention to provide a test apparatus capable of collecting a noise component generated by the power conversion apparatus and reducing noise included in an electric signal obtained from a device under test for a test.

[0005]

According to a first aspect of the present invention, there is provided a test apparatus, comprising: a power supply; a power converter connected to the power supply; and a power converter connected to the power converter. An electrical device, and a test apparatus including an electrical signal acquisition unit for acquiring an electrical signal from the device under test, a power line connecting the power conversion device and the electrical device,
One end thereof is attached to the electric device, and a noise return line that acquires a noise component from the electric device and returns the noise component to the power conversion device, wherein the power line and the noise return line are arranged in the same direction as a common mode choke coil. It is characterized by winding several turns on the same turn.

According to a second aspect of the present invention, a test apparatus obtains an electric signal from a power source, a power converter connected to the power source, an electric device connected to the power converter, and a device under test. A test apparatus comprising an electric signal acquisition unit, comprising: a power line connecting the power supply and the power conversion device; and a ground wire of the power conversion device, wherein the power line and the ground wire are the same as a common mode choke coil. It is characterized by being wound several turns in the same direction.

According to a third aspect of the present invention, a test apparatus obtains an electric signal from a power supply, a power converter connected to the power supply, an electric device connected to the power converter, and a device under test. In a test apparatus including an electric signal acquisition unit, a power line connecting the power conversion device and the electric device is provided, and an electromagnetic / electrostatic shielded cable line is used as the power line, and the cable line is subjected to the power conversion. It is characterized by being connected to a device.

According to a fourth aspect of the present invention, there is provided a test apparatus for obtaining an electric signal from a power supply, a power converter connected to the power supply, an electric device connected to the power converter, and a device under test. A test apparatus comprising an electric signal acquisition unit, comprising: a power line connecting the power supply and the power conversion device; and using an electromagnetic / electrostatic shielded cable line as the power line. It is characterized by being connected to.

According to a fifth aspect of the present invention, in the test apparatus of the first aspect, an electromagnetic / electrostatic shielded cable is used as the power line and the noise return line, and the cable is connected to the cable. It is characterized by being connected to a power converter.

According to a sixth aspect of the present invention, in the test apparatus of the second aspect, an electromagnetic / electrostatic shielded cable line is used as the power line and the ground line. It is characterized by being connected to a power converter.

According to a seventh aspect of the present invention, in the test apparatus according to any one of the first to sixth aspects, the electric device is an AC motor having a rotating shaft, and the rotating shaft has a common mode. It is characterized by having a choke coil penetrated.

The test apparatus according to claim 8 is the test apparatus according to claim 7, wherein the rotating shaft of the AC motor is connected to a rotating power source, and the electric signal obtaining means includes: An electric signal is obtained by the rotation of the rotary power source, and based on the obtained electrical signal, a torque detection unit that detects a generated torque of the rotary power source,
The apparatus further includes a support for supporting the rotary power source and the AC motor, and the torque detection unit is supported while maintaining insulation from the support.

According to a ninth aspect of the present invention, in the test apparatus according to any one of the first to eighth aspects, the electric signal acquiring means acquires an electric signal from an automobile or a component used in the automobile. It is characterized by doing.

According to a tenth aspect of the present invention, there is provided a test apparatus according to any one of the first to eighth aspects.
The electric signal acquiring means acquires an electric signal from an aircraft or a component used in an aircraft.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. A. First Embodiment First, FIG. 1 shows a configuration of an automobile test apparatus according to a first embodiment of the present invention. As shown in FIG. 1, the vehicle test apparatus includes a torque detector (electric signal acquisition means) 11 for detecting a torque of an automobile engine 10 as a device under test,
A dynamometer (electric device) 12, an inverter unit (power conversion device) 13, and an AC power supply 14 are provided.

The torque detector 11 is a motor
Are connected via a coupling 20 to the rotating shaft of
A weak electric signal is detected from the rotation of the rotating shaft of the automobile engine 10 and sent to the amplifier 21. The electric signal detected in this way is amplified by the amplifier 21 so that an electric signal corresponding to the detected torque can be obtained. Here, the power supply 22 is a power supply that supplies power to the amplifier 21.

The AC dynamometer 12 is a general AC motor having a rotor 23 disposed inside a housing 25 and a stator coil 24 disposed around the rotor 23. The AC dynamometer 12 has a rotating shaft 26 connected to the rotor 23, and the rotating shaft 26 is connected to a rotating shaft 27 of the torque detector 11 connected to the automobile engine 10 via a coupling 28. ing. Therefore, the rotating shaft 26 of the AC dynamometer 12 is adapted to be rotated with the rotation of the automobile engine 10, and in this case, the AC dynamometer 12 functions as an AC generator.

The rotating shaft 2 of the AC dynamometer 12
6 is penetrated by a common mode choke coil 48. The noise generated by the inverter unit 13 described below includes the inverter unit 13, the housing 25 of the AC dynamometer 12, the floating capacitor, the stator coil 24, and the rotor 2.
3. Flow will occur along a transmission route such as the rotating shaft 26 and the torque detector 11, but by providing the common mode choke coil 48 in this manner, transmission of noise from the rotating shaft 26 to the torque detector 11 can be suppressed. it can.

In this embodiment, the vehicle engine 10 and the AC dynamometer 12 are supported by the support base 9, but the torque detector 11 for handling a weak electric signal is supported by the support member 8 made of an insulating material. I have. By supporting the torque detector 11 in a state of being floated from the support 9 in this manner, insulation from the support 9 can be maintained. Thereby, it is possible to reduce transmission of a noise current component or the like generated by the inverter unit 13 to the torque detector 11 via the housing 25 and the support 9 of the AC dynamometer 12, The influence on the obtained electric signal can be reduced. At this time, since the torque detector 11 is smaller and lighter than the AC dynamometer 12, the structure for supporting the torque detector 11 via the support member 8 described above does not become large.

AC dynamometer 12 and inverter 1
3 is connected by a three-phase output line (power line) 29. A ground line (noise return line) 30 having one end attached to the housing 25 of the AC dynamometer 12 is connected to a ground line 31 inside the inverter unit 13. That is, the ground wire 30 of the AC dynamometer 12
Are connected to a ground electrode via a ground line 31 of the inverter unit 13. In addition to the function as a ground line, the ground line 30 has a function of returning a noise current component generated by the inverter unit 13 and flowing out to the AC dynamometer 12 side from the AC dynamometer 12 to the inverter unit 13 side. I have. Therefore, it is preferable that the diameter of the ground wire 30 be equal to or more than 1/3 of the diameter of the three-phase output wire 29.
A wire whose diameter is sufficiently larger than the ground wire used for the C dynamometer 12 is used. This makes it easier for the noise current component to flow from the AC dynamometer 12 to the ground wire 30.

Here, the AC dynamometer 12 and the inverter unit 13 are connected by a cable 32 in which a three-phase output wire 29 and a ground wire 30 are bundled and electromagnetically and electrostatically shielded. The cable 32 electromagnetically and electrostatically shields the ground wire 30 of the three-phase output line 29 up to the connection position between the inverter 13 and the three-phase output line 29. As the electromagnetic / electrostatic shielded cable 32, a cable having a structure as shown in FIGS. 2 and 3 can be used. By connecting the electromagnetically and electrostatically shielded cable 32 to the inverter unit 13 as described above, the high frequency leakage current component caused by the floating capacitor between the three-phase output line 29 and the ground can be reduced.
Thus, the high-frequency leakage current component can be prevented from flowing out to the ground electrode through the second shield portion.

The three-phase output line 29 and the ground line 30
The same number of turns are wound around the common mode choke coil 34 in the same direction in the vicinity of the connection with the inverter 13. By winding the three-phase output line 29 and the ground wire 30 around the common mode choke coil 34 in this way, the inductance is ideal for a current flowing from the AC dynamometer 12 to the ground wire 30 in the direction of the inverter unit 13. Will be zero. Therefore, a noise current component can be recovered from the AC dynamometer 12 to the inverter unit 13. On the other hand, when a current flows in the opposite direction, the common mode choke coil 34 exhibits a large inductance, and
Outflow of the noise component current into the AC dynamometer 12 can be suppressed.

The inverter unit 13 and the AC power supply 14 are connected by a three-phase input line (power line) 33. Here, the inverter unit 13 and the AC power supply 14 are connected to the three-phase input line 3.
3 and the ground wire 31 are bundled and connected by a cable 36 (the covering structure is the same as that of the cable 32).
Electrostatic / electromagnetic shielding up to the point of connection. This makes it possible to recover the high-frequency leakage current component due to the floating capacitor between the three-phase input line 33 and the ground to the inverter unit 13 side via the shield portion of the cable 36, and the high-frequency leakage current component flows to the ground electrode. Can be suppressed.

The three-phase input line 33 and the ground line 31
The same number of turns are wound around the common mode choke coil 37 in the same direction in the vicinity of the connection with the inverter unit 13. By winding the three-phase input line 33 and the ground wire 31 around the common mode choke coil 37 in this way, the inductance is ideally reduced with respect to the current flowing from the AC power supply 14 to the inverter portion 13 through the ground wire 31. It becomes zero, and shows a large inductance for a current flowing in the opposite direction. Therefore, the noise current component generated by the inverter unit 13 does not flow out to the ground electrode via the ground line 31 and can be collected by the inverter unit 13.

The AC dynamometer 12 is provided with a rotational speed detector 42, which detects the rotational speed of the rotating shaft 26 of the AC dynamometer 12. The rotation speed detector 42 may detect the rotation speed using a resolver, or may use a pulse encoder. The rotation speed signal detected by the rotation speed detector 42 is transmitted to the inverter 13 via the rotation detection signal line 41.
Sent to Here, the power supply 43 is a control power supply,
It is connected to the rotation detection signal line 41 via the inverter unit 13. At this time, the rotation detection signal line 41 is connected to the common mode choke coil 4 near the inverter unit 13.
4, thereby suppressing the noise current component from flowing out of the inverter unit 13.

In the vehicle test apparatus according to this embodiment,
As described above, the three-phase output line 29 and the ground lines 30 and 3
Since the phase input line 33 and the ground line 31 are wound around the common mode choke coil 34 and the common mode choke coil 37, respectively, a high frequency noise component generated due to the switching element forming the inverter unit 13 is The noise component can be collected by the inverter unit 13, which is a noise source, and the noise component can be prevented from flowing out to the ground electrode. In such an automobile test apparatus,
In addition to the inverter unit 13 and the AC dynamometer 12,
As shown in the present embodiment, the torque detector 11 that obtains a weak electric signal and detects torque is provided. Therefore, noise may occur in the electric signal obtained by the torque detector 11 due to the current flowing to the ground electrode. Recently, an IG capable of high-speed switching has been used as a switching element constituting the inverter unit 13.
In many cases, a BT (Insulated Gate Bipolar Transistor) is used. In this case, a high-frequency noise component generated by the inverter unit 13 is larger than that of an inverter using a bipolar transistor as a switching element. On the other hand, in the vehicle test apparatus according to the present embodiment, since the leakage current to the ground electrode can be suppressed as described above, even if an inverter using an IGBT as a switching element is used, the torque detector 11 It is possible to reduce the occurrence of noise in the detection result of.

B. Second Embodiment Next, an automobile test apparatus according to a second embodiment of the present invention will be described. In the above-described first embodiment, the three-phase input / output line of the inverter unit 13 and the ground line are wound around the common mode choke coil. However, as in the second embodiment described below, the DC output line and the ground line are connected. May be wound around a common mode choke coil.

As shown in FIG. 4, the vehicle test apparatus further includes a converter (power converter) 50 and a DC / DC converter (power converter) 51 in addition to the configuration of the above-described vehicle test apparatus. The DC / DC converter 51 is connected to an electric device (eg, a fuel cell) 52 as a device under test by a DC 2 output line (power line) 53. In this case, the DC / DC converter 51 operates to absorb the electric power stored in the electric device 52 via the DC 2 output line 53 and return the electric power to the AC power supply 14 side. By performing such an operation, the performance of the electric device 52 is tested. However, since this configuration is the same as that of a known vehicle test device used for a performance test of a fuel cell or the like, details thereof are described. Description of the configuration is omitted.
The device under test to which the DC / DC converter 51 is connected via the DC 2 output line 53 is not limited to the above-described fuel cell, but may be an inverter / motor (electric device) for an electric vehicle or the like. In this case, the DC / DC converter 51 functions as a device that supplies power to the connected inverter in various patterns, thereby supplying power to the inverter motor for the electric vehicle from the battery for the vehicle. It is possible to create a natural situation. Thus, the DC / DC converter 51
Creates a situation simulating the case of connection with an automobile battery, and performs a performance test of an inverter / motor for an electric automobile.

The DC / DC converter 51 and the electric device 52 as a device under test acquire a noise current component from the electric device 52 in addition to the DC 2 output line 53 described above, and
/ DC converter 51 is connected by a noise return line 56 returning to the side. Here, the DC / DC converter 51 and the electric device 52 are connected by a cable 57 (the same covering structure as the cable 32 of the first embodiment) in which a DC 2 output line 53 and a noise return line 56 are bundled. Thereby, the DC 2 output line 53 and the noise return line 56
Are electromagnetically and electrostatically shielded up to the connection position with the DC / DC converter 51. As a result, the high-frequency leakage current component is recovered by the DC / DC converter 51 through the shield portion of the cable 57 in the same manner as in the first embodiment described above.
The leakage of the high-frequency leakage current component from the DC 2 output line 53 to the ground electrode is suppressed.

The DC 2 output line 53 and the noise return line 56 are connected near the DC / DC converter 51
The same number of turns are wound around the common mode choke coil 58 in the same direction. In this way, by winding around the DC 2 output line 53 and the common mode choke coil 58, the noise component current can be recovered from the electric device 52 to the DC / DC converter 51 via the noise return line 56. Here, the noise return line 56 is DC
Inside the DC / DC converter 51, the noise return line 56 is connected to the ground electrode via the ground line 59, and is connected to the ground electrode in addition to the function of returning noise. Also functions as a line.

The converter 50 is connected to the DC / DC converter 51 and the inverter unit 13 and converts AC power supplied from the AC power supply 14 to DC power, or supplied from the DC / DC converter 51 and the inverter unit 13. DC power to AC power. Here, as the three-phase input line (power line) 55 connecting the AC power supply 14 and the converter 50, a cable 60 (the same covering structure as the cable 32) which is shielded by electromagnetic and electrostatic is used.
The phase input line 55 is electromagnetically and electrostatically shielded up to the converter 50. This suppresses the leakage of the high-frequency leakage current component from the three-phase input line 55 to the ground electrode.

In the vicinity of the converter 50, the three-phase input line 55 and the ground line 61 of the converter 50 are wound around the common mode choke coil 62 in the same direction and the same number of turns. By winding the three-phase input line 55 and the ground wire 61 around the common mode choke coil 62 in this manner, the noise current generated by the converter 50 is prevented from flowing out to the ground pole via the ground wire 61.

As described above, if the common mode choke coil is provided in the DC / DC converter 51 for transmitting and receiving DC power to and from the device under test as described above, it is possible to suppress the flow of noise current to the ground electrode. it can. Therefore, similarly to the first embodiment described above, it is possible to suppress an adverse effect on a device that acquires a weak electric signal such as the torque detector 11.

C. Modification In the first and second embodiments described above, the DC / D
Although the test apparatus for a vehicle having the C converter 51 and the AC dynamometer 12 has been described, the present invention can be applied to a test apparatus having another electric device. In the first embodiment, an automobile engine is taken as a device under test. However, in the present invention, a mechanical device such as a transmission or a vehicle-mounted motor can be used as a device under test. Further, in the second embodiment, the fuel cell is taken as the electric device of the device under test, but a battery such as a lead storage battery for an automobile can also be used as the electric device.

In addition to the test apparatus for automobiles, the present invention can be applied as a test apparatus for other transportation equipment such as an aircraft.

[0036]

As described above, according to the present invention,
In a test apparatus having a power converter, a noise component generated by the power converter can be collected, and noise included in an electric signal acquired from a device under test for a test can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an automobile test apparatus according to a first embodiment of the present invention.

FIG. 2 is a table showing a structure of a cable used in the vehicle test apparatus.

FIG. 3 is a sectional view showing the cable.

FIG. 4 is a block diagram illustrating a configuration of an automobile test apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

9 ... support base, 10 ... engine or mechanical device (device under test such as automobile engine, transmission, etc.), 11
...... Torque detector (electric signal acquisition means), 12 AC
Dynamometer (electric device), 13 inverter unit (power conversion device), 14 AC power supply, 26 rotating shaft, 29 three-phase output line (power line), 30 ground line (noise return line) ), 31 ... ground wire, 32 ... cable, 33 ... three-phase input line (power line), 34 ... common mode choke coil, 36 ... cable, 37 ...
Common mode choke coil, 48 Common mode choke coil, 50 Converter (power conversion device)
51 DC / DC converter (power conversion device), 52
…… Electric device (test object such as fuel cell, lead-acid battery), 5
3 ... DC 2 output line (power line), 55 ... 3 phase input line (power line), 56 ... noise return line, 57 ... cable, 58 ... common mode choke coil, 60 ...
Cable, 61: Ground wire, 62: Common mode choke coil

Claims (10)

[Claims] 1. A test apparatus comprising: a power supply; a power conversion device connected to the power supply; an electric device connected to the power conversion device; and an electric signal acquisition unit for acquiring an electric signal from a device under test. A power line connecting the power converter and the electric device, and a noise return line having one end attached to the electric device, acquiring a noise component from the electric device, and returning the noise component to the power converter. A test apparatus wherein a power line and the noise return line are wound around a common mode choke coil in the same direction by the same number of turns. 2. A test apparatus comprising: a power supply; a power conversion device connected to the power supply; an electric device connected to the power conversion device; and an electric signal acquisition unit for acquiring an electric signal from a device under test. A power line connecting the power supply and the power converter, and a ground line of the power converter, wherein the power line and the ground line are wound around a common mode choke coil in the same direction by the same number of turns. Characteristic test equipment. 3. A test apparatus comprising: a power supply; a power conversion device connected to the power supply; an electric device connected to the power conversion device; and an electric signal acquisition unit for acquiring an electric signal from the device under test. A power line for connecting the power conversion device and the electric device, wherein a cable line that is electromagnetically and electrostatically shielded is used as the power line, and the cable line is connected to the power conversion device. apparatus. 4. A test apparatus comprising: a power supply; a power conversion device connected to the power supply; an electric device connected to the power conversion device; and an electric signal acquisition unit for acquiring an electric signal from the device under test. A power line for connecting the power supply and the power conversion device, wherein a cable line that is electromagnetically and electrostatically shielded is used as the power line, and the cable line is connected to the power conversion device. . 5. The test apparatus according to claim 1, wherein an electromagnetic / electrostatic shielded cable line is used as the power line and the noise return line, and the cable line is connected to the power converter. 6. The power line and the ground line,
The test apparatus according to claim 2, wherein an electromagnetic / electrostatic shielded cable line is used, and the cable line is connected to the power converter. 7. The test apparatus according to claim 1, wherein the electric device is an AC motor having a rotating shaft, and a common mode choke coil is passed through the rotating shaft. 8. The rotating shaft of the AC motor is connected to a rotating power source, and the electric signal acquiring unit acquires an electric signal by rotation of the rotating power source, and based on the acquired electric signal. And a support base for supporting the rotary power source and the AC motor. The torque detection unit further insulates the support base from the support base. The test apparatus according to claim 7, wherein the test apparatus is supported while being maintained. 9. The test apparatus according to claim 1, wherein the electric signal acquiring unit acquires an electric signal from an automobile or a component used in the automobile. 10. The test apparatus according to claim 1, wherein the electric signal acquiring unit acquires an electric signal from an aircraft or a part used in the aircraft.