DE1015103B - Device for obtaining quantities suitable for damping oscillations in control loops and dependent on a speed and / or its first derivative - Google Patents

Description

GERMAN

It is known that the stability of control loops can be improved by, in addition to the controlled variable even their first or further temporal derivatives enter into the controller. A simple and known measure, a z. B. to get a size proportional to the speed is the use a small DC voltage generator whose EMF is proportional to the speed. One switches this emf to a combination of capacitor and resistor, so you can look at this resistor pick up a voltage roughly proportional to the acceleration. The DC tachometer machines are now unsuitable for some tasks of their sensitive and maintenance-requiring collector, which is why there are also AC tachometer machines with special additional direction-sensitive ones Circuits have been proposed.

The invention relates to a device for obtaining for damping oscillations in Values suitable for control loops and dependent on a speed and / or its first derivative, in which a non-contact, inductively acting measuring system has a shaft influencing the controlled variable is coupled. The invention consists in that the field frame of the to obtain the speed and its first derivative of dependent variables used measuring system with which the controlled variable influencing shaft is firmly connected, compared to which the one from a core with embedded Coil existing secondary part rotatably mounted and as an effective moment of inertia by a zero position spring is tied up while it is slowed down by eddy currents.

The drawing shows a schematic representation of two different embodiments of the invention.

In Fig. 1, a system is drawn with which an acceleration-dependent alternating voltage is obtained. The principle is based on the law Md = J · ω, where Md = torque, / = moment of inertia and ω = angular acceleration.

So if you let the angular acceleration to be detected act on a mass via a spiral spring, so is the respective deflection of the mass in relation to that of the driving shaft of the angular acceleration proportional.

In Fig. 1, 19 denotes the shaft whose acceleration is to be detected. With the shaft 19 is a frame 20 rigidly connected to which a field frame 21 is attached. The alternating field is therefore with the shaft 19 rotatably arranged. Next is the shaft 19 via one or two oppositely acting Zero position springs 22 are coupled to the laminated mass 23, which can have grooves for receiving the coil 24. The current consumption of the .Spule 24 can both device for extraction

for damping oscillations

suitable in control loops, from a

Speed and / or their first

Derivation of dependent quantities

Applicant:

Elektro-Mechanik GmbH,
Wendenerhütte via Olpe (Westf.)

Dipl.-Ing. Walter Sussebach,

Wrestled (Kr. Olpe, Westf.),

and Dipl.-Ing. Karl-Heinz Blaß,

Dieringhausen (Oberbergischer Kreis),

have been named as inventors

be carried out contactlessly via movable strands and also without special strands via the neutral position spring 22.

If the shaft 19 rotates at a constant speed, the mass 23 is located with the winding 24 opposite the field frame 21 at rest. The alternating voltage is assumed at the output of the winding 24 equals zero. If the shaft 19 experiences an acceleration or deceleration, the mass experiences 23 according to the law described above, a deflection relative to the field frame 21 and thus also the Winding 24, so that a speed change proportional to its output terminals Voltage is available. The phase position of this voltage obtained is opposite to the exciting one Mains voltage zero or 180 °, depending on the acceleration or deceleration.

Finally, FIG. 2 shows a combination of the detection of the speed-dependent and acceleration-dependent State of the driving shaft shown. Here are the same position numbers as in Fig. 2 chosen for the same parts. In addition, a light metal disk is connected to the mass 23 via the shaft 25 26 coupled, which is in the field of a magnet 27 or a field strength in known per se Way variable solenoid runs and eddy current braking with respect to the field frame 21 is held back. It is easy to see

709 660/325

now an alternating voltage is available at the output of the measuring device 24, which is both speed-dependent as well as being proportional to acceleration and also direction-dependent.

Claims (5)

Patent claims: 1. Device for obtaining suitable for damping oscillations in control loops, variables dependent on a speed and / or its first derivative, for which with a non-contact, inductive measuring system is coupled to a shaft influencing the controlled variable is, characterized in that the field frame is used to obtain the speed and their first derivative dependent variables used measuring system with the Controlled variable influencing wave is firmly connected, compared to which the one from a core with embedded coil existing secondary part rotatably mounted and as an effective moment of inertia is tied up by a zero position spring, while it is braked by eddy currents. 2. Device according to claim 1, characterized in that the derivative of the secondary coil takes place contactlessly via movable strands. 3. Device according to claim 1, characterized in that the current decrease from the Secondary coil takes place via the neutral position spring without special strands. 4. Device according to claim 1, characterized in that the effect of the eddy current brake is changeable by the excitation of the eddy current solenoid in per se known Way is arranged adjustable. 5. Device according to claim 1, characterized by the rotatable arrangement of the by a Zero position spring connected to the field frame secondary part, eliminating the eddy current brake to generate only the first derivative of one proportional to the velocity Sizes. Considered publications:
German Patent Nos. 250 583, 681537, 657, 216 707, 282650, 597 796, 470454. 1 sheet of drawings © 7096 «V325 8.57