JP3033255B2 - Torsion shaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsional vibrator used to test a specimen such as an automobile joint by applying a torsional vibration to the specimen.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a conventional torsional vibrator. In the figure, 10 is a specimen, 2
0, 20A are motors of the same rating (induction motor), 21,
21A is a speed detector (pulse generator) PLG,
22 and 22A are lock devices, 30 and 30A are inverters, 31 is a reference speed command device, 32 is a vibration command device, and 33 is a switch. The vibration command device 32 generates a vibration command signal ΔN shown in FIG.

[0003] In this arrangement, when no given vibration command signal by vibration command 32, electric motor 20, the motor 20A together, is a bamboo undergoing reference speed command N _K from the reference speed command unit 31 Therefore, they rotate at the same rotational speed N _K. In this state, closing the switch 33, from the vibration command unit 32, when generating the vibration command signal, the reference rotational speed command signal N _K from the reference speed command unit 31 the vibration command signal is added A signal is given to the inverter 30A as a speed command signal, and
Torsion due to the speed difference A is added.

[0004]

In the conventional torsion tester, only the speed difference between the motors 20 and 20A is controlled, and the rotation angles θ of both motor rotating shafts are ignored. If the required accuracy of the torsion test is high, there is a problem that it cannot be adequately dealt with. In addition, this torsion test machine cannot perform torque excitation, so that one There is an inconvenience that the torsional test by the speed difference excitation and the torsional test by the torque excitation cannot be performed with the shaker.

[0005] The present invention has been made to solve this problem, and an object of the present invention is to provide a torsional vibrator capable of performing a more precise torsional test than in the past.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a locking device for locking a first motor, a second motor, one end of a specimen and a shaft of the first motor, and A lock device that locks the other end of the specimen and the shaft of the second motor, a first inverter that performs speed feedback control on the first motor, and a second inverter that performs speed feedback control on the second motor. And a torsional vibrator having a vibration commander that varies a speed command given to the first inverter with respect to the second inverter, wherein a synchronizing means for synchronizing rotation angles of both electric motors is provided. .

According to a second aspect of the present invention, the synchronizing means is a synchro electric machine connected to the respective rotating shafts of the first electric motor and the second electric motor.

According to a third aspect of the present invention, there is provided a lock device for locking the first motor, the second motor, one end of the specimen and the shaft of the first motor, and the other end of the specimen and the second motor. A lock device that locks the shaft of the motor, a first inverter that controls the speed of the first motor in a feedback manner, a second inverter that controls the torque of the second motor, and a reference to the second inverter. A configuration is provided with a reference torque commander for giving a torque command and a vibration commander for giving a variable torque command to the second inverter. Torsional shaker.

According to a fourth aspect of the present invention, there is provided a lock device for locking the first motor, the second motor, one end of the specimen and the shaft of the first motor, and the other end of the specimen and the second motor. A locking device that locks the shaft of the motor, a first inverter that performs speed feedback control of the first motor, a second inverter that performs speed feed control of the second motor, and a reference speed command to both of the inverters. A reference speed commander for providing a vibration command, a vibration commander for supplying a vibration command to one of the two inverters, a synchronization means for synchronizing the rotation angles of the two electric motors, and for electrically opening the synchronization means A first switch, a torque commander for providing a reference torque command to the one inverter, and a second switch for selectively connecting the reference speed commander and the torque commander to the one inverter. And a pitch, and a structure the vibration command device can be switched output torque fluctuations / variations speed command signal.

[0010]

According to the first aspect of the present invention, since there is a synchronizing means, it is possible to prevent a deviation of the rotation angles of both electric motors and perform a torsion test of the specimen.

According to the third aspect of the present invention, since the output deviation between the reference torque command device and the vibration command device is given to the second inverter, it is possible to apply torsional torque vibration to the specimen.

[0012] Torque can be applied.

According to the fourth aspect of the present invention, since the vibration command device can output the differential speed vibration command and the torque vibration command signal,
By switching both switches, with one shaker,
Both differential velocity excitation and torque excitation can be performed.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numerals 40 and 40A denote synchro electric machines whose secondary sides are connected via a resistor R, and their primary sides are both connected to an excitation power supply (voltage; v _o , frequency; f _o ) AC. ing. One end of the rotating shaft of the synchro electric machine 40 is connected to the electric motor 20 via the lock device 22, and one end of the rotating shaft is connected to the co-specimen 10. Synchro Electric 4
In 0A, one end of the rotation shaft is connected to the electric motor 20A via the lock device 22A, and one end of the rotation shaft is connected to the co-specimen 10. 41 is a detector for detecting and amplifying a secondary induced voltage v ₂ of synchronous electrical machine 40 and 40A. Reference numeral 42 denotes a rotation angle detector that detects the rotation angle θ of the co-specimen 10 from the detection value of the detector 41. Other configurations are the same as those in FIG.

FIG. 4 exemplifies a vibration command signal generated by the vibration command device (differential speed vibration command device) 32 of the present embodiment. (A) is a constant level vibration command signal, (b) is a sine wave vibration command signal, and (c) is a triangular wave vibration command signal.

In this configuration, when the vibration command signal from the vibration command device 32 is not given, both the motor 20 and the motor 20A rotate at the same rotation speed N _K. In this state, closing the switches 33 and generate a sine wave vibration command signal ΔNsinωt from vibration command 32 shown in FIG. 4 (b), the reference rotational speed command signal N _K from the reference speed command unit 31 The signal to which the vibration command signal is added is given to inverter 30A as a speed command signal.

[0018] Consequently, in the period t ₁ ~t ₂ of FIG. 4 (b), the output frequency f ₂ of the inverter 30A inverter 3
0, which is higher than the output frequency f ₁ , during the period t ₂ -f of FIG.
In t _3, the output frequency f ₂ of the inverter 30A is lower than the output frequency f ₁ of the inverter 30, vibration twist pressurized angle varies with a constant period is applied to the specimen 10.

Since the synchro electric machines 40 and 40A generate a synchronizing force so that the slip frequency is the same, the rotation angle θ ₁ of the rotating shaft of the motor 20 and the rotating angle θ ₂ of the rotating shaft of the motor 20 are different. Synchronize (θ = θ ₁ = θ ₂ ). The rotation angle θ is detected by the rotation angle detector 42 and guided to a display or a recording device (not shown).

FIG. 2 is a block diagram showing the torsional torque vibrator. In the figure, 50 and 50A are torque detectors. The torque detector 50 is the lock device 22
Connected to the electric motor 20 through the
3, which is connected to the co-specimen 10 via a shaft 3 and detects a torque T ₁ generated by the electric motor 20 and a rotation speed N ₁ of the electric motor 20. Torque detector 50A is Jikuyui via the lock device 23A to co specimen 10 while being Jikuyui the motor 20A through a locking device 22A, the rotational speed of the torque T ₂ and the electric motor 20A of the motor 20 occurs N Detect ₂
Reference numeral 51 denotes a torque difference detector that detects a relative torque difference ΔT from a detection value T ₁ of the torque detector 50 and a detection value T ₂ of the torque detector 50. This detected relative torque difference Δ
T is guided to a display or a recorder (not shown). 52
It is a reference torque command unit, provides a reference torque command T ₁ to the inverter 30A. The vibration command device 32A is a torque vibration command device, and sends out a torque vibration command signal having a waveform shown in FIGS.

In this configuration, the vibration commander 32A
Assume that the sine wave excitation command signal shown in FIG. 4B is generated. The electric motor 20 rotates at a rotation speed N _K and generates a torque T ₁ . Motor 20A is the period t ₁ ~t ₂ of FIG. 4 (b), the output W ₂ of the inverter 30A is higher than the output W ₁ of the inverter 30, the period t ₂ shown in FIG. 4 (b)
In ~t _3, W ₂ of the inverter 30A inverter 30
Is lower than the output W ₁ , and the torsion torque excitation that fluctuates at a constant cycle is applied to the specimen 10.

FIG. 3 shows a torsional vibrator capable of switching between a torsional angle vibrator and a torsional torque vibrator by switching a switch. The power switch 34 and the vibration command changeover switch 35 are closed, and when the torsional torque vibration is performed, both switches 34 and 35 are opened. The vibration command device 32B is a vibration command device capable of switching and outputting the differential speed vibration command and the torque vibration command signal.

In this embodiment, the reference speed commander 31 and the reference torque commander 52 are provided with a vibration commander 32B for giving a fluctuation command separately, and the vibration commander 32B is provided with a differential speed vibration command and a torque Since the vibration command signal can be output, both the differential velocity vibration and the torque vibration can be performed by one vibration machine by switching both switches 34 and 35.

[0024]

As described above, according to the present invention, by providing the synchronization means for synchronizing the rotation angles of the first and second motors, it is possible to prevent the rotation angles of both motors from being shifted. Therefore, a highly accurate torsion test can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

FIG. 3 is a block diagram showing still another embodiment of the present invention.

FIG. 4 is a diagram showing a vibration command signal generated in the embodiment.

FIG. 5 is a block diagram showing a conventional torsional shaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Specimen 20, 20A Motor 21, 21A Speed detector 22, 22A Lock device 23, 23A Lock device 30, 30A Inverter 31 Reference speed command device 32, 32A, 32B Vibration command device 34, 35 Switch 40, 40A Synchro electric machine 42 Rotation angle detector 50, 50A Torque detector 51 Relative torque difference detector 52 Reference torque commander AC excitation power supply

Claims (4)

(57) [Claims] A lock device for locking a first motor, a second motor, one end of a specimen and a shaft of the first motor, a second end of the specimen, and a shaft of the second motor. A lock device for locking the first motor, a first inverter for performing speed feedback control on the first motor, a second inverter for performing speed feedback control on the second motor,
A torsional vibrator having a vibration command device for varying a speed command given to the first inverter with respect to the second inverter, comprising: a synchronization unit for synchronizing rotation angles of the two electric motors. A torsional shaker. Wherein synchronization means, vibration exciter torsional according to claim 1, characterized in that the synchronous electrical machine is coupled to a respective rotational axis of the first motor and the second electric motor. 3. A first electric motor, a second electric motor, a locking device for locking one end of a specimen and a shaft of the first electric motor, and a second end of the specimen and a shaft of the second electric motor. A first inverter that controls the speed of the first electric motor, a second inverter that controls the torque of the second electric motor, and a reference torque command to the second inverter. A torsional vibration exciter comprising: a reference torque commander for giving a value; and a vibration commander for giving a variable torque command to the second inverter. 4. A lock device for locking a first motor, a second motor, one end of a specimen and a shaft of the first motor, and a second end of the specimen and a shaft of the second motor. , A first inverter that performs speed feedback control on the first motor, a second inverter that performs speed feed control on the second motor, and a reference that provides a reference speed command to both inverters. Speed commander,
A vibration commander for giving a vibration command to one of the two inverters, a synchronizing means for synchronizing the rotation angles of the two electric motors, a first switch for electrically opening the synchronizing means, A second torque commander for giving a reference torque command to the inverter of the second type, and a second speed commander for switching the reference speed commander and the torque commander to the one inverter.
Wherein the vibration command device is capable of switching and outputting a fluctuating torque / fluctuating speed command signal.