DE1708769U - CIRCUIT FOR EXCITING ELECTROMAGNETICALLY ACTUATED FRICTION COUPLINGS OD. DGL. - Google Patents

Description

SPRING COUPLINGS · DISC COUPLINGS · ELE KT R O M A G N E T K U P P L U N G E N - ELASTIC COUPLINGS- C E NTRl-AN LAU FKU PP LU N G EN -TROW TRACK- S H LEI F LEI TU N GS CHANNELS -LIMIT SWITCH

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Betreif Schaltimg aar excitation of electromagnetically operated friction

od » dergl > -_ (Ag.» M 15 458 / 47e Ga)

With electromagnet! Saw actuated friction clutches or the like. It is customary to perform the excitation of the electromagnet moving the armature disk in such a way that the armature disk moves relatively quickly Resistance of the coil to be excited is dependent on, up to the operating or rated current strength is then completed in a corresponding, but short time. The whole power-· until reaching iev operation · "or Hennatromstärke and thus the nominal torque therefore takes place in a period of time" is too short to the moment of inertia to overcome a from standstill to be driven by a running engine via the clutch machine. Before this period of time has elapsed, the clutch grips hard with full torque and must then "slip" in order to compensate for the difference between the angular speeds of the prime mover and the driven machine. 23a of this batschen under the full pressure of the anchor plate against the friction disks, which determines the rotation speed, »Le-

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MACHINE FACTORY

", 2 _., The German Patent Office, Hünchen June 18, 1954

Sheet to the letter to, from

places or the like done «is the wear and tear on these parts very large. There is also a risk that the inevitable hard fit of the coupling the prime mover, the working machine, the goods conveyed or processed by this and / or the coupling itself is damaged or made unusable.

These disadvantages are caused by the circuit according to the fire avoided. With the new circuit, when the excitation current is switched on, the magnet coil is initially set to a basic current strength, which is greater than the waste current strength, but smaller than the approach current strength © and then by a current surge, or several of which, the strength of which is greater than the starting current strength, but smaller than the nominal current strength, excited, whereupon the The excitation is again reduced to the basic current strength and after some time finally increased to the Sennstroa strength.

By this type of intermittent excitation, in contrast to the previously used type of excitation, one is relatively causes a rapid increase in the current strength up to the characteristic current strength, a significantly lower course at the beginning the middle Stromkuxre brought about, the later reached the Hennstromstrom and during the Sutsch time the Coupling remains significantly below the current curve that characterizes the previously practiced procedure.

In the circuit according to the rate of inflation, the exciter circuit is generally Lying working contact of a delay relay lying in the lift connection When the excitation current is switched on, it is open and bridged by a resistor or several, one of which is through the working contact of an also ia ff-level connection to the exciter circuit lying wiping relay is bridged at the end of the day, whereby the resistances together represent the base current strength and the not bridged resistance alone results in the surge current strength.

- 3

MASCH IN EN FABRI

Sheet ^{5 of} the letter to ^the German Patent Office, Munich ^ _{dated June} 19, 1954

In dear Figure 1 is the iait of the circuit according to the innovation The course of the exciter current curve achieved in solid and dashed lines plotted against time · In addition the current curve is shown in dash-dotted lines »as it results from the previously usual excitation»

The individual currents are indicated here * ie as follows

i. " Waste current strength at which the attraction force of the electromagnet just reaches the level that the armature disk od, the like" under the action of forcing springs or the like abfSlitι

■ i "β ßrundstroffistärksj

i_ "■ Anrttekstromstiirke" through which the magnetic attractive force is amplified so much that the _t abgedrückte armature plate is placed over the air gap to the forward movement}

* si? ^e shock atroastärk © and

i_ «If current strength (operating current strength)

HiQ Figure 2 shows a circuit according to the innovation. In this circuit diagram is with

S <* the coil of the clutch, Y * a delay relay,

K- * a, to be closed and opened by T Working contact,

R. »adjustable resistor together with R ₂ to limit the current strength to ig»

R_ - adjustable resistor to limit current άβτ on i _st "

W - a wiping relay t

K ₂ «a working contact to be closed and opened by W and sit

S «· eis Sehalter
designated.

Sheet 4 of the letter to ^the German Patent Office, Munich, dated June 18, 1954 """

The positive pole of a DC source is directly connected to the one end and the negative pole via switch 3 and through the delay relay 7 to be actuated contact K. to the other end of the clutch coil Sp connected «The contact K. is bypassed by a line in which the adjustable resistors R. and R- are connected in series. To the Short-circuiting the resistor K. is parallel to this the Contact K “placed, which is closed by the wiping relay W. and is opened.

The delay relay V and the wiping relay W are through any other power source is supplied or, as shown, is shunted to the excitation currents » ..,.

The operation of the circuit is as follows It is assumed that the engine that has the clutch is supposed to drive a machine that is at rest, runs fully «The circuit is in the one shown Conditions «If switch S is now closed, it flows Excitation current to coil Sp, whereby it is jointly adjusted to the basic current strength i_ through the adjustable resistors H, and R_ is restricted. The wiping relay 1 now responds and closes the contact £ », sodaS for a short, adjustable period of time the resistance K- is switched off for this time. As a result, a current surge I of the size reaches the exciter atrorakreia i_ .. When the wiping relay W drops out, the contact SL

Ott C.

reopened, so that the resistance R- again ia excitation circuit and its current strength sinks back to i_ (Funct II) « Through this current impulse I «the over the contact strength ig went out, the armature disc is in sight of the Seibache disc, lamellae or the like. been moved and lies since the Waste straw starch i. is not undercut, at this old light pressure on, so that a torque »which is sufficient to partially overcome the inertia of the machine, is transmitted.

Claims (1)

PM9409W18J the German Patent Office »Munich 18.6.1954 Sheet to the letter to / from The start-up of the machine is thus initiated. During the time from point II "to point V, the basic amperage becomes i "adhered to and the pressure generated in the clutch Ks pressure of the armature disk against the friction disks or the like. caused a further overcoming of the moment of inertia of the driven machine _t so that its speed has approached that of the prime mover Now pronounces the "delay relay 7 and closes Hen contact K -." Whereby the resistors H ₁ and R- are turned off and the Erregerstront on i "can rise · doing so increases the od.dergl of the armature plate to the friction exerted bridge. the extent "that the Fenndrehmoment is reached and the clutch now If dex switch S is opened runs without slipping ·, there is again the initial state and * a new start-up process can begin. In order not to make the start-up process unnecessarily long, a second current impulse (point III) can be given by the wiping relay and the time from the subsidence of this impact on i_ (point IT) to Response of the delay relay Y as desired, ζ · Β · up to Point TX can be extended · Palis required the power surges can be repeated any number of times * Protection claim Circuit for the excitation of electromagnetically operated friction clutches or the like, characterized by a delay relay (V) lying in the excitation circuit and its working contact (2,), which is in the excitation circuit and open when the excitation current is switched on, through one or more resistors (R ₁ , B-) is bridged, one of which is _{temporarily bridged by the normally open contact (K 2} ) of a wiping relay (W) which is also shunted to the exciter circuit »whereby the resistors (R ₁ , B ₂ ) together represent the basic current strength (i_) and the unbridged resistance (H -) only give the surge current strength (ig +). Maschinenfabrik 3troaag G.m.b.H. /