DE3136459C2 - Device for controlling an electric axle winding DC drive - Google Patents

Abstract

The invention relates to the control of an electric axle winder to a predetermined tension value (z) in the web (1). For this purpose, the armature current setpoint (i ↓a ↓s) of the DC machine (3) is derived from the quotient of the winding diameter (d) to the magnetic flux (δ) and the flux setpoint (δs) is derived from the winding diameter (d). The diameter is calculated from the web speed and the winding speed. This allows the tension setpoint and field weakening of the DC machine to be set independently of one another.

Description

Description where Ar ₁ . Zr ₂ constants, ip» the flux base value and f(d)

30 the diameter-dependent flux change (field weakness

The invention relates to a device for chung); it follows from equations 2—4
iControl of an electrical axial winding DC-

iriebes to a given tension value in the winding /. = k; (5) track, where the armature current and flux are adjustable, the

,Winding diameter from winding speed 35 in other words, the tension /. is

and winding speed and the armature current is therefore only a function of the derivative factor k\ ;

ffrom a ratio of winding diameter to the diameter-dependent field attenuation

Flow proportional function is derived. Such a function is only a function of the factor k 2. By appropriate

The device is from the Technical Information AEG- appropriate choice of these factors one has it in the

Telefunken 60 (1970) 6, pages 383 to 385. 40 Hand, to choose the most favorable ratio in each case.

In this known arrangement, the field in Fig. 2 is a diagram corresponding to these relationships

Dependence on the EMF, i.e. the web speed basic control is shown in more detail; as can be seen,

ity, changed. The required armature current in a divider module 4 as a quotient of goods

is calculated from the belt tension torque by converting the web speed v and the speed η of the motor 3 into

:the flow is obtained. Depending on the web speed 45 the diameter d of the winding proportional Wcrl

This results in under-formation with the same diameter.

different fields and armature currents. At low values, the difference between the

Path speeds are the field adjustment overlook diameter (/and minimum diameter d”, _m

not effective at all, so that the entire diameter is formed. From this, the potentiometer 7 is used to

range controlled by adjusting the armature current 50 diameter-dependent change of the flux cinge-

must be.

The object of the present invention is to provide a

in, to design the known device so that in value Aips = kl ■ f(dd _m i,) corresponding voltage,

in any case &mash; regardless of the track speed If this voltage is added in the adder module 15, a

— the entire field range can be used vs basic setpoint Ip ₀ of the flow proportional value ad-

fkann. dicrt, the setpoint &phgr; for the flow is as follows-

This object is achieved according to the invention by the expression:
that the flow setpoint of the flow control is also
the function proportional to the winding diameter ip _s = ipo + £2 ■ f(d)—d„,j„)
In this way, the adjustment range of the 60

armature current — also independent of the track speed. The voltage proportional to the diameter d

speed — by the amount of field adjustment is also fed to a divider 5, in

smaller. A smaller setting range of the quotient of diameter and flow setpoint <p _s

The armature current leads to a correspondingly high voltage. The voltage proportional to this value

accuracy of the tension control. b5 voltage is controlled by a potentiometer 6, which, depending on the setting,

Using an embodiment shown in the drawing, position k 1 provides the anchor current setpoint /«, namely

The invention is explained in more detail using an example of the invention; it shows the following relationship:
gene:

For this purpose, a corresponding function generator 19 must be provided in front of the divider element 5. This is of interest for various applications,

This results, as explained above, in the fact that the tensile stress depends only on the setting k I and, independently of this, the diameter-dependent field weakening depends only on the setting k 2 .

In the circuit shown in Fig. 3, a voltage proportional to the speed v of the winding web I is generated by means of a tachogenerator 8 and fed to a divider element 4. This divider element 4 is also fed with a voltage generated by means of a tachogenerator 17 coupled to the motor 3, which voltage corresponds to the actual speed value η . From the ratio of v to η, a value proportional to the diameter ddcs of the winding 2 is formed in the divider element 4. The ramp-function generator contained in the divider element 4 prevents a sudden change in the diameter signal when starting up. The voltage corresponding to the diameter d is divided in a divider 5 by a voltage corresponding to the flux setpoint i/wdcr DC machine 3, so that a voltage proportional to the value dl(ps is produced at the output of this divider 5. The current setpoint ;,,» which can be taken depending on the setting k 1 of the potentiometer 6 is compared in a controller 10 with the current actual value i&rdquor; and is used to control an armature current actuator 11 for the DC machine 3.

In order to ensure that a diameter value is available at the beginning of the winding process, the calculated value is replaced by a value set on potentiometer 9. This voltage is then switched off via switch S when the actual diameter can be calculated from the rpm and web speed. This value, which can be read off on potentiometer 9, corresponds to the initial diameter at the beginning of the winding process.

The difference between diameter d and minimum diameter </&ldquor;&ldquor;&ldquor; is formed via an amplifier 16. The diameter-dependent field attenuation Δtps is specified directly from this using the potentiometer 7 - setting k 2 -. The following applies:

Atps = ki(dd _mi &ldquor;)

The basic setpoint value <po of the flux is added to this setpoint change Aip.s of the flux in the adder 15 and the resulting total flux value (ps is limited to 10 V and compared with the actual flux value φ in a controller 13. The actuator 12 for the excitation current i _e of the DC machine 3 is controlled depending on the difference. To take into account the non-linear relationship between the excitation current /<· and flux φ of the machine, a functional generator 14 is also provided which carries out the necessary conversion between flux and excitation current.

To increase the accuracy, the actual value of the flux φ can also be calculated from the quotient of EMF c and speed η in an eo element 18, as indicated by the dashed line. The flux control thus constructed is subject to excitation current control.

As already mentioned above, this results in a setting k\ of the potentiometer which defines the tension r.

As indicated by the dashed line, it is also possible to change the web tension 7. depending on the winding diameter.

2 sheets of drawings

Claims (4)

1 2 Patent claims Fig. I the basic structure of an axle winder in a schematic representation, 1. Device for controlling an electric axle - Fig. 2 the principle diagram of the control and
winding DC drive to a predetermined tension value in the winding track, at the armature 5 winding track. current and flow are adjustable, the winding diameter The power coming from a delivery unit not shown ser from winding web speed and winding web 1 &mdash; possibly also a strand &mdash; speed can be calculated and the armature current setpoint can be wound on a winder 2. To drive (hs) of the armature current control from a the Quo- of the winder 2, a DC motor 3 is provided, ients of winding diameter to flow proportional 10 Between tension/in the web !, the FIuIJ nal function is derived, characterized by &phgr;, the winding diameter d and the armature current /', indicates that the flux setpoint (q>s) of the flux rcgc- of the DC machine 3 is determined via the tension mo- tion from a relationship also corresponding to the winding diameter m, the following:
(JJproportional function is derived. 2. Device according to claim 1, characterized in that the flux setpoint (φ) is only determined by the winding diameter ^. This results in 3. Device according to claim 1, characterized in
that the setpoint values (i&ldquor; _s , Aips) for Bahn/ug SL (?) and diameter-dependent field weakening can be tapped at 20 * ~ '■'' d * ' potentiometers (6,7) which are connected to the Sizes proportional voltages connected - If you now select:
are. 4. Device according to claim 1, characterized in that at the beginning of winding a predetermined 25 Winding diameter (d _mm ) in place of the calculated . _ , d_ ... net winding diameter (d) . '·'~ &phgr;