DE2110674B2 - ELECTRIC WATCH WITH AN ELECTROMAGNETIC DRIVEN ROCK - Google Patents

Description

35

The invention relates to an electric clock with a balance wheel made of two axially spaced discs, tlie arranged offset from one another in the circumferential direction on their facing surfaces l'aare arranged coaxially with respect to their polar axis Wear permanent magnets, one of which is arranged on one of the surfaces of the discs, with one one Detector coil and a drive coil having, executed coaxially in a common winding plane Coil arrangement, which is inserted between the pole faces of the permanent magnets, held in place in such a way, that in the course of the swinging movement of the balance the transverse direction of movement of the coil strands the coil arrangement between the two magnetic fields cross the permanent magnets of the pairs, and with an electrical amplifier device which, controlled by the detector coil, excites the drive coil.

There are already clocks with electromagnetic balance drive known (DT-OS 15 48 031), in which the Detector coil and the drive coil are arranged coaxially in a common winding plane. These 'The measure is only taken to achieve an alternating current resonance gain that it is thereby possible that at least the permanent magnet cooperating with the detector coil is off consists of a large number of individual permanent magnets arranged one behind the other in the direction of oscillation. This large number of permanent magnets causes an alternating current signal in the detector coil, which is below Is subjected to resonance conditions of amplification. The excitation coil is on the outside of the drive coil arranged around reaching and dimensioned such that they are about the width of a in the effective coil width Magnetic disk corresponds

Another proposal for a clock with an electromagnetic balance wheel drive (FR-PS 15 17 282) works with two coils with opposite directions of winding both the function of the drive coil and that of the detector coil for the other Coil in its capacity as a drive coil. Due to the accommodation of two drive coils, the result is This requires a considerable amount of space in the space that the coil takes up between the permanent magnets of the balance wheel

In a clock of the type mentioned (GB-PS 10 55 295) the possibility is shown by the two coils forming the coil arrangement, one as a detector coil and the other as a drive coil serves to arrange one within the other in the same winding level. The arrangement itself is taken in a manner not described in detail in such a way that the peak values of the negative and positive induced Voltage in the detector coil are significantly different. This leads to particularly unfavorable Modulation ratios of the amplifier transistor, since the control voltage at the base of the transistor is correspondingly different. To ensure switch-like behavior, the lower peak value corresponding voltage ratios for switching through at the base of the Ensure control transistor, the higher peak value then means unnecessary expenditure of energy.

To have the required minimum detector voltage and the necessary drive energy for the balance wheel To be able to provide, one was previously forced to take into account the smallest possible space requirement Coil arrangement with a high number of turns of very thin wire and the magnets made of a very high quality permanent magnet material. Overall, this leads to accordingly high manufacturing costs and complicates the assembly of the coil arrangement.

The invention has for its object to provide a clock of the type mentioned, whose Coil arrangement can be produced more easily and with a compact design and low energy consumption can be mounted.

The object is achieved according to the invention in that the detector coil is inside the drive coil arranged and dimensioned such that by avoiding traversing both at the same time Magnetic fields from each of the two strings of columns of the detector coil, the positive and negative peak values of the voltage induced in the detector coil are about the same size.

Due to this special arrangement of the detector and the drive coil in adaptation to the local position of the Magnetic fields of the two permanent magnet pairs succeed. better modulation conditions of the amplification device to achieve, which has the effect that the coil arrangement with fewer turns can be carried out, whereby larger wire gauges can be used with the same space requirement can. In addition, it is possible to use relatively simple permanent magnets with a correspondingly low field strength get along.

The arrangement of the detector coil in such a way that it is gripped around the outside in front of the drive coil leads to the fact that their S. coils running transversely to the direction of movement

itrands are relatively closely spaced. For this reason, the two pairs of magnets can also be used in In the circumferential direction of the balance wheel, arrange them relatively closely spaced. This leads to the fact that the path of the magnetic flux of lines of force can be kept correspondingly small and thus with little resistance and that the detector signals relatively close when the balance wheel passes through the middle area of the .Schwingweges take place. If the detector coil were around the outside of the

to block the direct current, at 17 a basic series resistor, at 18 the drive coil, at 19 a driver transistor and, at 20, a DC power source.

In Fig. 4 shows the voltage curve at the switching points A, B, C of the drive circuit when this is necessary for driving the unrest according to FIG. 1 is used. A curve of the voltage profile induced in the detector coil 15 is represented by a ihl Lii i F i 4 (A) dllt the curve

Arranged around the drive coil, the dotted line in FIG. 4 (A) shown the curve

Double drive pulse relatively far from the center of the falls in the response time in a range in which the

Give up oscillation of the balance wheel, which has an unfavorable effect on - - - · - the operation of the watch.

In a particularly preferred embodiment, the ^ .. ^ _K " ₆ ™ - -.- -

lulenordnung only three connections, one is as 15 of the electrical current, which in the detector coil la

Driver transistor is operated. This is shown by the curve shown in solid lines when one the voltage drop of the internal resistance as a result

so-called center tapping carried out.

The invention is explained in more detail below with reference to the embodiments shown in the drawing. It shows
i V

flows, added. The voltage occurring at the collector side connection of the drive coil 18 has a voltage opposite phase to that produced by the detector coil 15, as shown in FIG. 4 recognize

d bi about the one

Fig. 1 shows a front view of a balance with electro- 20 If the voltage sander base above that rig · ¹ <- "" - ,, ..,. ,., ,,,. ·. i_ · i_i a T, _a ; k "ririnti" inr conductive

Fig. 1 is a front view of a balance with a magnetic drive device of conventional design

F i g. 2 shows a plan view of the balance according to FIG. 1,

3 shows an embodiment of a drive circuit usual design,

4 curves of the voltage profile at three circuit points of the in FIG. 3 drive circuit shown when operating a balance wheel according to FIGS. 1

If the value increases at which the driver transistor becomes conductive, electric current flows through the detector coil 15 in the base and the collector voltage at point C of the driver transistor goes back to its value, the it occupies in the conductive state of the transistor.

During this period of time, the decoupling capacitor 16 is charged by the current flowing from the Detector coil 15 flows to the base. The charging voltage on the capacitor is used to create the basis of the

Fi ε 5 is a front view of a balance with inventive 30 transistor to be biased so that the transistor m Electromagnetic actuator designed in accordance with the application remains in its locked switch position when ^ sit driving equipment.

remains in its locked switch position when it has been adopted. This is from FIG. 4 (B) . The i ii Bih the by the

gg (

Peak value in the positive range of the detector voltage caused by the oscillation of the balance

. . . , ... 1 · ΐ-- · ιι_ Λ CoUiirinithfi.

F i g. 6 an embodiment of the magnet coil,

Fie.7 curves of the voltage profile at three "« """>"»""-'-■'■""'" ■ · '"· ^ VaHn A _Pr Srhwinebe-Schähungspunk.en of the in F i g. 3 is not the same for the case of the swing circuit during operation of a clockwise movement of the balance according to the invention. the ^ Schwmgbe ^ designed electromagnetically operated balance.

Fig.3 shows one used for electrical clocks

iinnih common design in front view. The balance ^ um ua..v .. ^ ....- - ~ _

Looked at two disks, which are mounted around a balance wheel 2 40 between the basic pretensioning bar. At the positions facing each other of a single torque pulse and the surfaces of the disks 1 are in the circumferential area two
Pairs of permanent magnets 3, 4 and 5, 6 arranged by
each of which the two who form a pair, regarding

Wegung uer uiuun im um ^, ₆ v, _a _-.

movement of the balance wheel counterclockwise or when a base current occurs.

There is therefore a difference V _B i FIG. 4 (S)

a single driver pulse and those immediately before a double driver pulse came about. If the base bias resistance is too small, the driver transistor gets into his

each of which the two who form a pair, in terms of small, so gcmngi uu,. ^. ^,

their magnetic pole axis perpendicular to the disk- 45 conductive state before the single drive pulse level should occur in alignment and with different magneti-, whereby energy is wasted, see poles facing each other. On the other hand, if the base bias resistance is too large, then it is Direction of the magnetic fields between the permanent magnets - the negative base bias increases accordingly, th 3, 4 or 5, 6 of the two permanent magnet pairs is what results in a reduction in width and ap'itude opposite. In the gap between the duration 50 of the driving pulse affects. So is the basic prestressing net of the pairs is a coil arrangement consisting of a resistor limited to a certain range Detector coil 7 and a drive coil 8 are arranged. - ■■ - -4 ~ -

The top view according to FIG. 2 leaves a magnetic spool frame 9 and counterweights 10 and 11 for balancing the balance. At 12 they are a permanent magnet pair forming permanent magnets and 4 and with 13 the other permanent magnet pair forming permanent magnets 5 and 6 in F i g. 2 designated. 14 is the associated coil assembly.

- · · · ■■■ "■ - .: 1 j:" c

To ensure the operation of the balance wheel, the double detector pulse must be large enough to detect the to exceed the given threshold range.

If the negative base bias increased too much just before the double detector pulse occurred is, the driver transistor cannot be switched fully conductive because the detector voltage is not correspondingly large enough. This leads to a decrease in the

Like Fi g. 1 reveals, the coil arrangement 60 reduces the transistor losses, which leads to a reduction in the

through the detector coil 7 and the drive coil 8 the oscillation amplitude of the balance wheel leads,

formed in such a way that these two coils are coaxial and in It must therefore be the number of turns of the Detektorspulc

Axial direction are arranged one behind the other. It is to be increased to have a sufficient detector span

also known to ensure the detector coil and the drive. Consequently, the number of turns must

coil can be reduced by winding both coils together to form one 65 of the drive coil if one di <

To train unity. Coil arrangement within a corresponding be

The drive circuit according to FIG. 3 shows a symbol which wants to hold a limited space. As a result, the ai

lierh Hei 15 the Detektorspulc, at 16 a capacitor of the drive coil occurring voltage is reduced, de

increased power consumption does not affect the drive of the balance wheel, which is why its oscillation amplitude sinks. In order to compensate for this disadvantage, the coil arrangement according to the prior art must have accordingly more turns of thinner wire are executed.

The invention is intended to make it possible to reduce the number of turns of the detector coil. To the embodiment shown in Figure 5, the shows a disturbance with permanent magnets arranged on this, the coil arrangement consists of a Drive coil 21 and a detector coil 22 and has an inner terminal 23 of the detector coil 22, a Connection 24 between the drive coil 21 and the detector coil 22 and an external connection 25 of the Drive coil 21 on. The coils are arranged around a magnet coil frame 26 (FIG. 6).

FIG. 7 shows the curves of the voltage profile at the circuit points A, S and C of the circuit according to FIG. 3 for the case of the connection of the coil arrangement 21, 22 according to the invention (FIG. 5). In this respect, FIG. 7 corresponds to FIG. The windings of the coils

21 and 22 are arranged coaxially in a winding plane, such that the winding of the detector coil

22 the magnetic fields of the magnet pairs 3, 4 and 5, 6 are not traversed simultaneously, so that the positive and negative sloping values of the induced voltage of the detector coil 22 are approximately the same size, as shown in FIG. 7 is clarified. Hence the base bias about the same before a single and before a double triggered driver pulse, for which refer to FIG. 7th Is referred to. The base bias can therefore be chosen to be the same, regardless of whether it is is a single or a double drive pulse, for which reference is made to Fig. 7 (S). the Difference voltage Vm is much smaller than that In the example according to FIG. 4 (fil).

Therefore, even when the peak value of the double detector pulse is low, the driver transistor can can be converted into a conductive state, the negative base bias voltage can be lower and the Number of turns of the detector coil 22 can be kept smaller, which is why thicker cheaper wire can be used leaves. The phase of the. Trcibeirstromes is slightly shifted from the phase position in which the Phase current gives the magnet a maximum of energy, but this makes practically no difference the end. The possibility of connecting both coils 21 and 22 to one pole of the voltage source via the common medium connection 24 results an advantageously simple arrangement of the coil connections.

As can be seen from the above, the arrangement according to the invention enables a Reducing the number of turns of the detector coil of an electrical clock of the type in question, as As a result, the number of turns of the drive coil can be increased. The coil arrangement can be omitted make thicker wire. The result is a cheaper and easier-to-use coil arrangement, which has an advantageous effect on the mass production of clocks of the type in question. Since the required detector voltage can be kept relatively low, cheaper magnets can be used

For this purpose 4 sheets of drawings

Claims (2)

Patent claims: 1. Electric clock with a balance wheel made of two axially spaced discs attached to each other facing surfaces in the circumferential direction offset from one another with respect to pairs carry their pole axis coaxially arranged permanent magnets, each one on one of the surfaces of the Discs is arranged, with a detector coil and a drive coil having, coaxially in common winding plane executed coil arrangement between the pole faces of the permanent magnets held stationary is used in such a way that in the course of the oscillating movement of the balance wheel transversely to the direction of movement running coil strands of the coil arrangement between the two magnetic fields traverse the permanent magnet of the pairs, and with an electrical amplifier device supplied by controlled by the detector coil, the drive coil is excited, characterized in that the Detector coil (22) arranged within the operating coil (21) and measured in such a way that by Avoid crossing both magnetic fields from one of the two coil strands at the same time of the detector coil the positive and negative peak values of the values induced in the detector coil Voltage are about the same. 2. Clock according to claim 1, characterized in that the coil arrangement has an inner connection (23), one of the detector coil (22) and the drive coil (21) common connection (24) and one has outer connection (25).