JPH073338Y2 - Acceleration tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a structure of an acceleration tester used for testing an airbag sensor, for example.

[Conventional technology]

One of the acceleration testers for carrying out the operation confirmation test of the acceleration sensor for detecting the operation timing of the airbag in the airbag unit mounted in an automobile or the like and used for saving lives in the event of a vehicle collision. 2. Description of the Related Art There is a solenoid type in which a mover side having a test stand on which is mounted is rapidly driven by an electromagnetic force to obtain a desired collision acceleration for testing.

[Problems to be solved by the device]

Since the mover travels on an abutment that supports it, there is mechanical loss between the wheel and the abutment, friction loss in wheel bearings, etc.
In addition to the problem that the required power must be increased, it becomes uneconomical, and when the required power increases, there is also a problem that the capacity of the switching element of the power supply device also increases and the size becomes large. There was a problem that smooth movement was hindered.

This invention was made to solve the above problems,
It is an object of the present invention to provide an acceleration tester capable of efficiently obtaining a desired test collision acceleration and smoothing the return-to-home position movement of a mover as compared with the conventional one.

[Means for Solving the Problems]

In order to achieve the above object, the present invention has a stator equipped with a field coil supplied with a field current, a mover of an air-core coil reciprocally driven by electromagnetic propulsion, an acceleration command and braking / stopping following the command. It has a power supply device which receives commands and amplifies the power of these commands to the mover, and uses a substantially horizontal U-shaped plate conductor having elasticity as a power supply line from the power supply device to the mover, The coil of the mover is connected at an upper end thereof, and the output terminal of the power supply device is connected at a lower end thereof through a fixed connection portion. It is designed to exert influence.

[Action]

In this invention, since the power supply line is made of an elastic member and connected in a horizontal U shape, the load does not become the load load of the mover because the upper part of the power supply line floats in the air. If the traveling friction of the mover is reduced and the elastic force of the power supply line acts upward on the mover, the mover is apparently lighter by that amount. Also,
Since the power supply line has an action of returning the mover to the original position side by its elastic restoring force, the return operation of the mover to the original position is assisted by the power supply line.

〔Example〕

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

In FIG. 1, reference numeral 1 denotes an E-shaped stator (field yoke) which is made of a magnetic material and to which a field coil 2 is attached. A track 3 extends horizontally from a central leg 1A extending through the field coil 2, and the other end of the track 3 is supported by a receiving portion 4 located at a predetermined distance from the central leg 1A. Reference numeral 5 denotes an air-core mover (aluminum armature coil) having a cylindrical shape with openings at both ends. Free wheels 6U and 6D are attached to the upper inner peripheral part and the lower inner peripheral part on one end side, and from the other end. Is the specimen (acceleration sensor) 8
The test table 7 for mounting sensors and sensors extends, and the free wheel 6C is attached to the lower side of the test table 7. This mover 5
Is fitted onto the central leg 1A by engaging the free wheels 6U and 6D with the upper surface and the lower surface of the central leg 1A, and the free wheel 6C of the test stand 7 engages with the upper surface of the track 3. Reference numeral 9 is a power supply device, and 10 is a power supply line. Power line 10
Is an elastic plate conductor made of, for example, phosphor bronze (for example, 0.5 mm thickness x 10 mm), as shown enlarged in FIG.
A fixed connector to which the mover 5 and the output line 11 of the power supply device 9 are connected by bending the plate conductor into a horizontal U shape (or a V shape with a bent portion). It is arranged between the coil 12 and the upper end 10A at the coil end of the mover 5,
The lower end 10B is connected to a fixed connector 12 provided on the ground. The above-described connection is made so that the power supply line 10 is in a bent posture that exerts an upward elastic force on the mover 5. 13
Is a field power supply, and 14 is a field feeder.

The power supply device 9 includes a PWM-controlled inverter INV that functions as a power amplifier.
As shown in the figure, four power transistors T _R1 , T _R2 , T
_A bridge connection of _R3 and _TR4 is provided, and a mover (armature coil) 5 is inserted between the AC output terminals A and B.
D is a flywheel diede. 15 is electrolytic capacitor, 16 is rectifier, 17 is inverter INV controller, 18 is PWM
A signal generation circuit, 19 is a hase drive circuit, 20 is a commander, and 21 is a single-phase AC power supply.

In this configuration, the command device 20 first sends an acceleration command P _g having a harbor sine waveform as shown in FIG. 4 at a predetermined sampling interval. This acceleration command P _g is the PWM of the controller 17.
When sent to the signal generation circuit 18, the PWM signal generation circuit 18 compares this with a carrier wave (for example, carrier frequency 6 KHz).
Create a PWM signal. The base drive circuit 19 generates a base drive signal based on this PWM signal to generate the transistors T _R1 and T _R4.
Supply to the base of. This allows both transistors T _R1 and T
_R4 starts the ON / OFF switching operation, and the mover 5 is supplied with a current (maximum value, for example, 300 amperes) whose envelope waveform is similar to that of the acceleration command P _g . It is rapidly accelerated in the direction shown by the arrow to reach a predetermined collision acceleration g.

During this time, the feeder line 10 is pulled by the mover 5 and deforms as shown by the broken line in FIG.

When the command device 20 finishes sending the acceleration command P _g , the braking command P _B
Is sent to the PWM signal generation circuit 18 at a predetermined sampling interval. Thus, in turn, transistor T _R2 and T _R3 starts ON / OFF switching operation by receiving the base drive signals, movable element 5 to the movable member 5 is supplied with a braking current of opposite polarity is stopped.

In the power supply line 10 in this embodiment, the upper half of the range indicated by L in FIG. 2 is suspended in the air and does not serve as a gravitational load on the mover 5. Therefore, the mover 5 travels accordingly. Friction is reduced. Furthermore, if the power supply line 10 is made to exert an upward elastic force on the mover 5, the weight on the mover 5 side is apparently reduced, so that the traveling friction is further reduced. Of course, when the mover 5 is accelerated, the power supply line 10 is deformed as described above, and thus the deformation resistance acts as a traction load on the mover 5, but the magnitude thereof is a gravity load in the upper half portion. Small compared to the case.

After the acceleration operation, the mover 5 is urged in the opposite direction and returned to the original position shown in the figure. At this time, since the deformed power supply line 10 tries to be restored by elasticity, the restoring force is It assists the return movement of the mover 5, smoothes this return movement, and its restorability facilitates the return of the mover 5 to the home position.

[Effect of device]

As described above, according to this invention, since the power supply line is made of an elastic member and is arranged in a substantially U-shape, a part of the power supply line does not become a load load when the mover travels, so that mechanical loss is reduced. In addition, if the elastic force of the power supply line acts upward on the mover, the mover becomes lighter in appearance by that amount. Further, since the feeder wire has an action of returning the mover to the original position side, there is an advantage that the return operation of the mover to the original position is assisted and the fixed position can be easily returned. .

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing an embodiment of the present invention, and FIG.
FIG. 4 is a perspective view of the power supply line in the above embodiment, FIG. 3 is a circuit diagram of the power supply device in the above embodiment, and FIG. 4 is a waveform diagram of commands given to the power supply device. 1 ... Stator, 1A ... Central leg, 2 ... Field coil, 3 ... Orbit, 4 ... Receiving part, 5 ... Mover, 6U,
6, 6C ... Free wheel, 9 ... Power supply device, 10 ... Feed line, 12
...... Fixed connector, 13 …… Field power supply, INV …… Inverter.

Claims (2)

[Scope of utility model registration request] 1. A stator equipped with a field coil to which a field current is supplied, a mover of an air-core coil which is reciprocally driven by electromagnetic propulsion, an acceleration command and a braking / stopping command following the command, and these commands. A power supply device for power-amplifying and supplying the power to the mover, wherein each feed line from the power supply device to the mover is a substantially horizontal U-shaped plate conductor, and the mover is provided at the upper end. And the lower end is connected to the output terminal of the power supply device through the fixed connection portion on the ground side. 2. The acceleration tester according to claim 1, wherein the power supply line exerts an upward biasing force on the mover.