FR2525047A1 - REVERSIBLE ELECTRIC MOTOR GROUP WITH A DRIVE MOTOR AND AT LEAST ONE SENSE SAFETY CONTACTOR - Google Patents

Abstract

A REVERSIBLE ELECTRIC MOTOR GROUP WITH A DRIVE MOTOR AND AT LEAST ONE SENSE SAFETY CONTACTOR AND A CONTROL CIRCUIT MOUNT FOR SENSE SAFETY CONTACTS HAS TWO CONNECTION CONNECTIONS ON THE DRIVE MOTOR OF SIGNALS 29, 30, D1, D2 HAVING DIFFERENT VOLTAGES DEPENDING ON THE DIRECTION OF ROTATION, AND ON THE DIRECTION SAFETY CONTACTOR 13, 14, 25 AT LEAST ANOTHER SIGNAL SOCKET CONNECTION 35, 36 WHICH CONDUCTS DIFFERENT VOLTAGES ACCORDING TO THE SETTING OF THE OPERATION MECHANISM OF THE SENSE SAFETY CONTACTOR. THE ASSEMBLY OF CONTROL CIRCUITS 33, 34, 39, 40, 45 IS PROVIDED WITH A COMPARISON DEVICE WHICH, ACCORDING TO THE OTHER SIGNAL SOCKET CONNECTION, PROVIDES THE MOTOR WITH A SIGNAL CORRESPONDING TO THE DIRECTION OF ROTATION PROVIDED, OR ANOTHER SIGNAL IN RELATION TO THE SIGNALS OF OTHER SIGNAL SOCKET CONNECTIONS, PROVIDES A CORRESPONDING SIGNAL OR ANOTHER SIGNAL. ACCORDING TO THIS, A CONTROL SIGNAL IS PRODUCED WHICH AT LEAST STOP THE MOTOR WHEN THERE IS NO CORRESPONDENCE BETWEEN THE SIGNALS.

Description

Reversible electric motor unit with a drive motor

  ment and at least one directional safety switch.

  The invention relates to a reversible electric motor unit with a drive motor and at least one direction safety switch and an assembly of control circuits for

sense safety contacts.

  The invention provides, depending on their embodiment, one or more

  direction safety contactors with contacts.

  A disadvantage of known power units is that false operations can occur due to the fact that the contacts stick. This can result from wear and erosion of the contact surfaces, but also from the formation of arcs during switching operations so that the contacts are welded and therefore sticking Even when the driver of a vehicle switches the direction safety switch, there is a risk that the vehicle will keep its steering This results in a very large

risk of accidents.

  In the case of control circuits on safety contacts

  curity or on microswitches, we work with

  auxiliary contacts Such auxiliary contacts do not provide

  do not provide direct information on the switching state of the directional safety contacts or main current contacts, since they are mounted mechanically in parallel with these Microswitches are mounted directly or indirectly upstream of the contacts main current, but they have the disadvantage that due to their small contact stroke, their fine adjustment is difficult and complicated and they are subjected to a high mechanical load

due to shocks.

  This generally leads to a premature failure of the microswitches or at least to their adjustment.

maintenance costs are high.

  Known control circuits also require high expenditure on wiring and auxiliary devices which have their own sources of breakdowns, not to mention the high mounting costs. The mechanical contacts used for the

  are also subject to natural wear.

  The object of the invention is to provide a motor unit of the aforementioned type, and in particular an assembly of control circuits which

  cannot be involved, like switches, or ana-

  log, mounted in parallel, in existing breakdowns or be the cause of additional breakdowns, but which, on the contrary, without receiving additional mechanical information, starts from the actual operating and switching conditions

  and thus achieve advanced security by providing a

  general which, in the event of a breakdown concerning the order and the condition

  effective walking, at least ensures the stopping of the central-

ment.

  This object is achieved according to the invention by the fact that pre-

  sees on the drive motor two signal socket connections with different voltages depending on the direction of rotation, and on the direction safety switch

  (at least one contactor is provided), at least one other

  signal plug cord which conducts different voltages

  annuities depending on the setting of the actuating mechanism

  direction safety switch, and that the circuit mounting

  control boils is fitted with a comparison device which, depending on whether the other signal socket connection gives the motor a signal corresponding to the direction of rotation provided,

  or another signal, compared to signals from other rac-

  signal plug cords, provides a corresponding signal or another signal, and when another signal is supplied a control signal is produced which at least stops

  the engine Thus, the conditions prevailing in the mo-

  are entered and a signal is obtained which, in the event of a

  erroneous operation, at least stops the engine without

  only the contacts used for control.

  By using two direction safety switches, two other signal connection connections are advantageously provided

  which provide different signal quantities depending on

  tion of the switching on of one or the other contactor

meaningless security.

  In the case of a single direction safety switch, two signals can be obtained depending on a switch-on or switch-off position, each position representing

  a determined working condition We prefer to use two contacts

  security sense sense because in this case the signals are

  different from the zero position.

  We prefer a mounting of control circuits comprising in

  the motor circuit a switch, for example a transis-

  tor, to enter a working frequency or frequency

  pulse repetition This is a realization

  favorable position of a drive motor group It is preferable to have signal socket connections on the motor

  each time a logic circuit diodes-transistors trans-

  forming the pulse voltages of the motor into static signals

  ticks In this zone, there are two equal voltages on the motor. The invention provides that the signal tap connections on the motor are arranged on each side on an element, such as the motor armature or the inductor coil. bypass or in series, which can be switched when controlling direction This is in particular a motor

  series or compound engine, namely

  continuous rant; it is assumed that on the vehicles are mounted DC motors powered by a battery. Advantageously, an evaluation in two stages of the measurement signals obtained on the signal socket connections is provided, in the first stage, the motor pulse voltages and the voltage level on the safety coils can be transformed into static signals, the second

  floor provides for an evaluation according to a CMOS logic which

  triggers a shutdown according to the result

  the result is a very simple circuit which can still be sim-

  laminate, which works with high functional reliability-

  and can be accommodated in a very small space.

  in the second floor, have at least two CMOS modules. In an advantageous embodiment, three AND elements are placed in the second stage before each four inputs and one OR element with three inputs, each of which is connected to an AND element, and the AND elements are respectively connected in pairs to an output of the four circuit assemblies of the first stage, namely each of a circuit assembly

  on a signal socket connection on an element of the

  and on a signal socket connection with respect to the direction safety switch, while the other two pairs are respectively connected with the signal socket connection with respect to the motor and with the safety switch

  meaning through an inversion circuit.

  An appropriate development is to use four circuits

  NAND cooked and four EXOR (OR EXCLUSIVE) circuits, one of which

  can be a NAND gate circuit in the evacuation circuit

  rating for safety contacts.

  In a suitable embodiment, the measuring circuit

  safe for points of connection to the motor element has two logic function blocks with discrete identical diode-transistors, in which diodes constitute a polarization protection and a coupling element for transistors whose transmitter is connected to the voltage

  of the battery and by which the pulses can be controlled

  Control sions Operational safety is thus improved Advantageously combines basic leakage resistors with the transistors to quickly stop the

  transistors even for high pulse frequencies.

  To obtain defined signals, it is preferred that the transa

  sistors are selected via a voltage divider, for example for the forward direction, to form a rectangular tension between a tension connection for

  about half of the battery voltage and a connection

  dement à la masse We thus take into account the fact that the state

  battery charge may decrease during operation-

ment.

  In addition, filter capacitors are provided in the

  connection to the battery ground connection to obtain

ning comparable signals.

  An advantageous embodiment includes RC circuits

  before the output connection of the pre-

  first stage in an achievement to bring the trend to zero

  rectangular resistance.

  In addition, a pulsed discharge of the conden-

  sators by transistors; in this case, the frequency of im-

  pulses is much lower than the natural frequency of the RC circuit and the pulse peaks occurring during

  of the change of direction are below the frequency of im-

own impulses.

2525047-

  When using just one direction safety switch with an excitation coil for two contacts

  inverters, there is provision in an advanced embodiment

  tagger three signal socket connections, and a signal Y is produced according to the formula Y = Dl D 2 i Kl + D 1 D 2 M Ki in which Dl and D 2 are the signal socket connections on an element of the engine d 'training; and l Kl is a connection to the direction safety switch

of the excitation coil.

  It follows from the above that the invention is suitable for controlling drive motor groups comprising

  DC motors in various designs.

  An appropriate embodiment consists in providing two AND elements as inverters each provided with two inputs,

  whose outputs are connected to the two inputs of an OR gate.

  The invention will be clearly understood on reading the description

  detail, given below by way of example only, of embodiments shown diagrammatically in the drawing, in which: FIG. 1 is a circuit diagram for a series connection for a motor drive using two sense safety contactors ; Figure 2 is another type of circuit of a series motor according to Figure 1; Figure 3 is an embodiment with a separate excitation motor intended to be mounted in the principle circuits of Figure 1;

  FIG. 4 is a variant of the motor circuits in consideration

  implementation of the safety contactors of sans; Figure 5 is a schematic view of another arrangement of drive motor circuits using only one direction safety switch; Figure 6 is a circuit diagram for a functional block of Figure 1, which occurs twice; FIG. 7 represents the shape of the voltage at the connection points on the motor;

  FIG. 8 is a diagram of the shape of the voltage at the outlet

  tie of the circuit of FIG. 6 in the case where a direction command is switched on; FIG. 9 is a representation corresponding to FIG. 8 for a transition to the deactivation state;

  FIG. 10 is an assembly diagram for another functional block.

  tional of Figure 1 which also occurs twice and

  which illustrates the contact with the safety contactors

meaning rite;

  FIG. 11 represents the characteristic curve of the tension

  input to the functional block of Figure 10;

  FIG. 12 represents the characteristic curve of the tension

  output of the functional block of FIG. 10; Figure 13 shows in more detail a functional block of Figure 1; FIG. 14 represents a variant of a functional block simplified compared to the embodiment of FIG. 13, in which the control of the contacts is used on two change-over contacts; Figure 15 is a variant of the assembly of Figure 10 with reference to Figure 14;

  FIG. 16 represents a functional block of a second stage

  ge for a drive motor circuit according to FIG. 5; and FIG. 17 represents a Karnaugh diagram for the functions explained on page 17 In FIG. 1, in the example shown, a series motor comprising an armature 2 and a reversible series winding 3 is connected to the bar 1 as voltage of drums

  positive The armature is controlled by a tran-

  sistor 4 which provides the working impulses for the command

  of operation The output of this circuit is set to

mass in 5.

  Connection 6 to bar 1 is connected to a bridge circuit 7 in the diagonal of which is the series winding

  3 and in the branches of which are arranged between the connection

  6 and the connection 8 to the armature 2 of the 9-1 Ki contacts,

-l Kl, 11-1 K 2, 12-1 K 2.

  To the bar 1 are connected two safety coils 13, 14 which are connected on the other hand to two switch contacts, 16 with which a direction switch 17 which cooperates

  is connected to ground in 19 via a transis-

tor 18.

  A compound winding 20 to

  separate excitation, as shown in dashes.

  The embodiment of FIG. 1 shows contactors for

  curity in opposition each comprising a rest contact and a working contact Figure 1 represents the

  When one of the safety coils 13, 14 is excited

  té, for example when the safety coil 14 is in circuit, we see that the contact 11 closes and the contact 12 opens so that the winding in series 3 is traversed

  from 6 through 11 and 10.

  FIG. 2 represents an exemplary embodiment in which the safety contactors with the excitation coils 13, 14 each have two working contacts The contacts 21 and

  22 are part of one of the safety contactors and the con-

  tacts 23 and 24 are part of each other, which provides

  a corresponding control of the series 3 winding.

  When using, according to Figure 3, a drive motor

  with separate excitation comprising the separate excitation coil

  rée 20, the armature 2 of the motor is mounted in the diagonal of the bridge circuit 7, in place of the series winding 3 For

  the rest, the assembly corresponds to the realization of the fig-

  re 1. Figure 4 shows another embodiment with the contacts 21, 22 and 23, 24 according to Figure 2, with another embodiment of the safety contactors; however, armature 2 is in

reversible bridge mounting.

  FIG. 5 represents an assembly according to another principle, known per se with the battery voltage bar Ul; in this case, a direction safety switch is simply connected with an excitation coil 25 It should be noted here that the direction switch, referenced in FIG. 1 at 17, passes appropriately through a transistor 26 In the case where only one direction safety contactor is used according to the figure, the transistor 26 serves as a switch for the excitation coil

  25 and in this case, there is always an ON or OFF state.

  This also results in two different signals for exci-

  ter coil 25 according to the switching state.

  In the embodiment of FIG. 5, the armature 2 of the motor is also arranged in the diagonal of a bridge circuit 7, which has the connection 6 and is on the other hand connected to a transistor 4 In the embodiment of Figure 5, the

  direction safety switch comprising the excitation coil

  tation 25 is a contactor with change-over contacts 27, 28 which can be switched in the opposite direction and thus control the flow of current through the armature 2 in one or

the other direction.

  It can be seen from FIG. 1 and the other representations of the bridge circuit 7 that two signal connection connections 29, 30 are provided on the diagonals, which comprise

  also the switchable element of the motor unit These connections

  signal take-up elements are also referenced in Dl and D 2 and lead by supply conductors 31, 32 to functional blocks 33, 34 The two functional blocks are identical and are explained below with reference

in Figure 6.

  With regard to voluntary switching, that is

  say performed by the user, from one or both

  sense safety sensors, it is provided on the windings

  excitation 13, 14 two other socket connections

  gnaux-35,36, which are also referenced in l Kl and 1 K 2 From these other signal sockets 35, 36 leave supply conductors 37, 38 which go to functional blocks 39, 40

of identical realization.

  In the functional blocks 33, 34; 39, 40 a milking takes place

  ment of the signals received so that it appears at the outputs

  41, 42, 43, 44 of the signals Dl A, D 2 A and l Kl A and 1 K 2 A determined

  born by the state of connection or functioning, which are

  brought to a functional group 45 which will be described later-

  ment, which constitutes the second stage of the assembly of control circuits and is described in an embodiment, for example

in figure 13.

  This functional block has an output 46, also referenced

  at Y, which supplies an actuating device 47 Ce

  positive actuation 47 is connected by functional links

  48, 49, either to a functional control unit 50 for the drive motor, or 51 for the contactors

  direction safety, to cause the stop in case of detection

  tion of an incorrect position At the same time, a brake 53 for the vehicle can be used by means of a

  functional link 52, or a lifting device or the ana-

  logue can be switched on to lower a load.

  FIG. 6 represents an advantageous embodiment of the functional blocks 33, 34 We see there the inputs Dl, D 2 and 29, 30 as well as the outputs 41, 42 and Dl A and D 2 A. This circuit consists of a discrete functional block

  transistor diodes This results in high dielectric strength

  trique This functional block includes diodes 54 and 55.

  These constitute a coupling element and an irrever-

  sibility for transistor 56 To work in the battery voltage 30% range, resistors 57 and 58 are

  chosen in the ratio 1: 1 Resistor 59 is a resistor

  basic leakage to quickly stop the transistor

  56 even in the case of high frequency pulses.

  The resistors 60, 61 which connect to the transistor 56, constitute basic resistances for a transistor 62, the shunt capacitor 63 is used to smooth the tips

  of tension which exist on the bar 1, i.e. the tension

  battery voltage, and which can also be produced by auxiliary groups of the vehicle, such as the hydraulic pump or the like To the collector of the transistor 62 is connected a resistor 64 which goes to a connection 65 for a reduced voltage of for example 12 volts below

  of the battery voltage This results in the direction of

  che before a rectangular tension coming from the connection-

signal socket 30, D 2.

  At resistance 64 a high signal arrives at the same time

  level for measuring point 29, D 1.

  Between the transistor 62 and the resistor 64 is connected a diode 66 which supplies an RC element comprising the resistor 67 and the capacitor 68, This RC element, which is connected to

  resistance 67 as well as at reduced connection 65, for example

  full of the order of 12 volts, is calculated so that the rectangular voltage still present at the resistor 64 is practically zero. It should also be noted that the transistor 62 and the diode 66 are discharged by pulses by the capacitor 68 Here, the frequency of working pulses is considerably lower than the frequency

of the RC element.

  One takes into account the points of impulses which occur during the regression of the impulse control and at the time of the change of direction by calculating the element RC sufficiently large so that it cannot appear information

wrong.

  To illustrate this, Figure 7 shows the voltage at point 69 We see that, with regard to the two inputs 29, 30, Dl and D 2, in one of the connection positions, in which Dl, or 29, is connected to the bar 1 having the battery voltage, there is a voltage curve 70 which each time has pulsed offsets after the command

  pulses; for a base voltage of 24 volts on the bat-

  There is a 10-16 volt drop-out. On the other hand, at the other signal socket connection 30, D 2, there is a voltage located in the range of the battery voltage, which

  is not reduced, in its average value, by the hooks

represented.

  At the exit in 71, there is a voltage curve according to the fi

  gure 8, provided that there is a voltage in the circuit shown at D 2 of about 12 volts along the characteristic curve 72, while at connection 29 there is a lower voltage, about 0.9 volts along the characteristic curve 73 In the case where the direction switch 17 is off, it follows from FIG. 9 that

  the characteristic curve 73, and therefore the voltage represented

  felt, rises along curve 74 to the level of characteristic curve 72 This gives stabilized signals. The functional blocks 39, 40 of FIG. 1 are identical and they are represented respectively in FIG. 10 Here, the inputs 35, 36 are represented according to 1 X 1 and 1 K 2 Here it is practically each time a circuit discrete diode-transistor logic, which has a dielectric strength

  high In this case, the diode 75 is connected to the RC element 76.

  In correlation with the circuit of the diode 77, a

  safety against voltage and reverse polarity

  rity Resistors 78 and 79 are calculated so that an adjustment of 30% of the battery voltage results. The capacitors 80, 81 usually filter the overvoltage peaks Resistor 82 provides, as resistance of base for transistor 83, a quick stop even at high frequencies The transistor 84, connected afterwards via a resistance circuit, reverses a signal for the second stage 45 At the output 43, 44 and l Kl A , 1 K 2 A appear signals, as shown

in figure 12.

  We will first refer to the diagram in Figure 11 The

  data 85 which indicates the tension, like all the others

  ordered in the representations that have been shown, my-

  that when the two contacts i Ki and 1 K 2, or 9 and 11 are open, the voltage is substantially that of the battery,

  but that it appears at the entry in 35, l Ki, when this connection

  dement is out of circuit, a characteristic curve of

  sion 86 when switching on with a lower voltage, while there is at the signal socket connection

  36, 1 K 2, a characteristic curve 87 which is found to be

  24 volt battery voltage, however with upward and downward deviations 88-91 in voltage spikes depending on the work pulses

  Figure 12 shows in this context a stabilized voltage

  sée at the output of the functional block, with regard to connection 35 with an output voltage 92 practically zero, and stabilized at the signal socket connection 36

  according to characteristic curve 93, with a lower voltage

  lower than the connection voltage of 12 volts, practically of the order of 11.8 volts, so that, for direction control of the direction safety switches,

  defined and stable output quantities.

  The voltage reduction compared to the battery voltage is carried out to ter-Ir account of the battery discharge

  during operation and to obtain conditions

  finished for the control circuit.

  We obtain in the way described, for the different states of

  switching at outputs 41-44 of the conditions which are shown

  sensed on the following table of functions and which, with reference to the functional block 45 of FIG. 1, lead to

an output signal Y at 46.

  In the following table, we use the symbols of a CMOS logic; for signals, O low (low) and

1 = high.

FUNCTION TABLE

  DIA line (41) D 2 A (42) 1 KIA (43)

1 K 2 A

(44) Y Q (46)

O O O O O 1

1 O O O O 1

0 1 O O O 1

1 1 O O O 1

O O 1 O O 1

1 O 1 O O 1

* 0 1 1 O 1 O

1 1 1 O

O O O 1

1 O O 1

0 1 O 1

1 1 O 1

0 O 1 1

1 O 11

0 1 1 1

1 I 1 1

0 1

0 1

1 O

0 1

0 1

1 O

O 1

0 1

0 1

  reverse gear forward gear control "run" direction not yet chosen So the possibilities of different

operating states.

  The number of rows is indicated in the left column.

  We see that the inscription on the right shows that authorized operating states are indicated on lines 6,

9 and 12.

  For perfect operation, the logical equation sought can be derived from the function table: line 6: K 6 = DIA 'D 2 A' 1 K 1 A '1 K 2 A line 9: K 9 = D 1 A' D 2 'KA' 1 K 2 A line 12 K 12 = Dl AD 2 A * Ki A * 1 K 2 A o Y = K 6 + K 9 + K 12

  Y = 5 D 1 AD 2 A 1 K 1 A1 K 2 AD 1 A D 2 A

  1 KLA 1 K 2 A + D 1 A D 2 A 1 K 1 A1 K 2 A

  Here means: signal negation means: AND + combination means: OR The equation can be transferred directly into blocks

logical functional.

  The functional block 45 is constructed according to this condition, comprises the inputs 41-44 and is shown in detail in FIG. 13 up to the output 46, Y This functional block comprises in all the inputs-an inverter 94, 95, 96, 97 and further respectively AND gates, or elements

  AND, 98-100 each having four entries 121-124 In this con-

  text, we refer to the functional equation above

  for Y from which the interconnection results The gate ET 98 is re-

  linked directly to inputs 42, 43 by conductors 101, 102 and to inputs 41, 44 by conductors 103, 104 by

  through the respectively connected inverter 94, 97.

  Corresponding interconnections are provided for selection

  other operating states for the other

  tes ET 99, 100 We thus obtain that there is always a signal at the output 46 in the OR gate 4, 125 (figure 3)

  with three inputs 126-128 when the equation Y is not satisfied according to the representation above.

  We see that, to carry out this assembly, it is necessary to plan

be logical blocks.

  In correlation with the embodiment according to FIG. 5 with two b change-over contacts, only three signal socket connections D 1, 29 are provided; D 2, 30 and 1 K 1, 105, the last of which illustrates an on-off function. We only provide here a safety contactor with direction 1 K 1 with the excitation coil 25 Suppose that this safety contactor 1 K 1 determines in the stop position the forward direction and in the on position, the reverse direction, this results in a functional Equation line D 1 D 2 1 K 1 YY

0 0 0 0 1 0

o o o o i o

I 1 O O 1 O O

2 O 1 O O 1

3 1 1 O 1 O

4 O O 1 1 O

1 O 1 O 1

reverse reverse forward

6 O 1 1 1 O

7 1 1 1 1 O

  Y = D 1 'D 2 1 K 1 + DT' D 2 '1 K 1

  The associated assembly is shown in FIG. 16 In a similar manner to the functional block according to FIG. 13, the inputs 41, 42 and 43 are represented with reference to FIG. 5; the elements ET 129, 130, which are referenced in

  D 2.1 and D 2 2 are associated with them, whence it results

  nexion These AND elements each have three inputs 131, 132, 133 and 134, 135, 136 These are inverters here each whose outputs 137, 138 are connected to the two inputs of the

  OR gate 139, D 3 1 at the exit of which the si appears

general Y mentioned above.

  We see that the inputs 131, 133 and 135 are each connected

  directly with inputs 41, 42, 105, while the inputs

  132,134 and 136 are each linked through

  reversers 94, 95 and 97, which provides a simple realization

folded.

  Another improvement based on the correlations indi-

  quées above for the output signal consists in grouping in a Karnaugh diagram represented on figure 17 the following functions appearing in this order: KA KB KC KD KE

: DIA '

: Di A

: D 2 A '

: D 1 A '

: D 2 A '

D 2 A 1 KIA

1 K 2 A

1 KIA

1 K 2 A

that

Y = KA + KB + KC + KD + KE

Y = DIA 'D 2 A + DIA

+ D 2 A '1 K 2 A

= (DA O 1 K 1 A) +

= (DIA W IKIA) +

Y = (D 1 TO 1 KIA) '

1 KIA + D 2 A

(D 2 A O 1 K 2 A)

(D 2 A & IK 2 A)

(D 2 A E 1 K 2 A)

* 1 K 2 A + D 1 A '1 KIA

+ D 1 A D 2 A

IA 'D 2 A

v 1 A 'D 2 A o

O = EXOR

'= AND

+ = OR

  In this relation, the expressions KB and KD as well as the

  expressions KC and KE produce an equivalence function.

  The circuit can be mounted with only two CMOS modules instead of the four previously used. A NAND quadruple and an EXOR quadruple are used. The EXOR D doors 1 3 and

  D 1.4 are mounted here as reversers.

  The result between the output 46 and the inputs 41-44 according to FIG. 14 is a circuit with three NAND gates 106, 107 108 and four EXCLUSIVE OR gates (EXOR) 109, 110, 111 and 112; the latter are connected by a connection 113, 114 to the stabilized voltage of 12 volts, for example The fourth AND gate can, according to FIG. 15, be inserted in the circuit of FIG. 10, and bears the reference therein 115 In the circuit in Figure 15, we see the transistor 83 and the

  associated resistance, so that in this form of reali-

  sation, the circuit has two input branches in the NAND gate at 119 In this embodiment, there is at output 120 a characteristic curve of signals according to FIG. 12 and this output 120 supplies, in this variant,

entry 44 in Figure 14.

Claims (8)

Claims.   1 Reversible electric motor group with a drive motor   undercarriage and at least one direction safety contactor and an assembly of control circuits for the safety contacts   curity of meaning, characterized in that it provides on the mo-   drive tor (2, 3) two signal socket connections (29, 30, Dl, D 2) with different voltages   depending on the direction of rotation, and on the safety switch   meaning rity (13, 14, 25) (at least one contactor being pre-   seen), at least one other signal socket connection (35, 36, 105) which conducts different voltages depending on   the adjustment of the actuation mechanism of the safety switch   sense of meaning, and that the mounting of control circuits (33, 34, 39, 40, 45) is provided with a comparison device which, depending on whether the other signal socket connection gives the motor a signal corresponding to the direction of rotation,   or another signal, compared to signals from other connections   signal socket, provides a corresponding signal or another signal, and when another signal is supplied,   a control signal is produced which at least stops the motor.   2 mounting control circuits according to claim 1, wherein there is provided two direction safety contactors, characterized in that there are provided two other signal socket connections (35, 36) which provide different de.signaux sizes in function of switching on   either direction safety switch (13, 14).   3 mounting control circuits according to claim 1 or claim 2, wherein there is mounted in the motor circuit a switch, for example a transistor, for   introduce a working or pulse frequency,   terrified in that it has the socket connections   gnaux (29, 30) on the motor respectively a logic circuit with diodes and transistors (33, 34) (figure 6) which transforms   motor pulse voltages as static signals.   4 Installation of control circuits according to any one   of claims 1 to 3, characterized in that the connections   signal socket (29, 30) on the motor are available   placed on each side on an element, such as the motor armature (2) or an inductor coil (3) in bypass or in series, which can be switched during direction control, and in that provides for a two-stage evaluation of the measurement signals obtained on the signal socket connections (29, 30, 35, 36; 105), the motor pulse voltages and the voltage level at the safety coils which can be transformed, in the first stage, in static signals, and the second stage (45) providing for an evaluation according to a CMOS logic, which triggers a deactivation in function of the result.   Installation of control circuits according to any one of   claims 1 to 4, characterized in that one places in the   second stage (45) three AND elements (98-100) each having   four inputs (121-124) and an OR element (125) with three inputs   trées (126-128), each of which is connected to an AND element (98-100), and that the AND elements are respectively connected in pairs to an output of the other circuit arrangements (33,   34, 39, 40) on the first floor, i.e. each time a   tage of circuits on a signal socket connection on   an element of the engine and on a socket connection   general with respect to the direction safety switch, while the other two pairs are respectively connected to the other signal socket connection with respect to the motor and to the   direction safety contactor via a circuit inversion cooked (94-97).   6 Installation of control circuits according to claim 1, characterized in that the measuring circuit for the points   of connection to the motor element has two function blocks-   logical nels with identical diode transistors (33, 34)   crets, in which diodes (54 and 55) constitute an element   coupling and polarization protection for the transistors (56) whose transmitter is connected to the voltage of   the battery (1) and by which the im-   control pulses, and in that these transistors (56) are associated with basic leakage resistors (59) to quickly stop the transistors (56), even for high pulse frequencies, other transistors (62 ) which can also be selected via a voltage divider (57, 58) for the forward direction to form a rectangular voltage between a voltage connection for approximately half of the battery voltage and a connection to ground, and filter capacitors (63) being provided in the connection to the ground connection drums.   7 Installation of control circuits according to claim 6,   characterized by RC circuits (67, 68) before connection   output ment (41, Dl A and 42, D 2 A) in an embodiment for zeroing the rectangular voltage at the resistor (64), and by a pulsed discharge of the capacitors (68) by transistors (66, 62 ), the pulse frequency being much lower than the natural frequency of the RC circuit (67, 68) and the pulse peaks occurring during   change of direction being below the pulse frequency let's be clean.   8 Installation of control circuits according to any one of   claims 1 and 3 to 4, characterized in that provision is made,   using only a direction safety switch with an excitation coil (25) for two change-over contacts (27, 28) three signal socket connections (29, 30, 105) and that a signal (Y) is produced according to the formula Y = D D 2 i Kl + Di D 2 l K-   in which Dl and D 2 are the signal socket connections (29, 30) on an element of the drive motor and l Kl is a connection (105) to the safety contactor of   direction of the excitation coil (25).   9 Installation of control circuits according to claim 8, characterized in that two ET elements (129, 130) are provided as reversers with respectively three inputs (131-136) whose outputs (137, 138) are connected both OR gate entries (139).   Installation of control circuits according to any one   claims 2 to 5, characterized by four circuits   NAND (106-108, 115) and four EXOR circuits (109-112) including a NAND gate circuit (115) can be placed in the   evaluation circuit for safety contactors.