BG64810B1 - Method for the control of a motor drive for a stepping switch and a stepping switch suitable for such a process - Google Patents

Abstract

The invention relates to a method, in which the position of the latch levers of an energy store are monitored, which normally retain the switch breakers thereof in the latched state and the motor drive is switched off, as soon as all latch levers are not in the latched position, whereby the energy store is released and the rapid commutation of the load transfer switch started. According to the invention, the stepping switch comprises proximity sensors in the region of the latch levers, for the carrying out of said method, said sensors being connected to a control circuit for the motor drive. It is thus guaranteed that the control circuit is broken and the motor drive stopped, as soon as not one of the latch levers is in the latched position and retaining the switch breaker of the energy store.

Description

(54) MOTOR DRIVE CONTROL METHOD FOR STEP SWITCH AND STEP SWITCH APPROPRIATE FOR THIS METHOD

Technical field

The invention relates to a method of controlling a motor drive for a stepper switch. In addition, the invention relates to a step switch specifically designed for this method.

BACKGROUND OF THE INVENTION

A motor drive of this type is known from DE 197 07 548 A1, as well as from the company publication Motorantrieb ED - Betriebsanleitung; edition of Druckimpresum BA 138/02 de ”to the applicant.

The known actuation serves for continuous switching of a step switch between various deviations of the control winding of a step transformer. The step switch is also actuated by actuating the motor drive. In this case, the control of the motor drive is carried out in accordance with the principle of stepping, ie. a process of moving a switching step is performed by a single control pulse, for example by activating a voltage regulator and then automatically ending. The next switching on is only possible again after a new rest position is reached (initial position).

To this end, the known motor drive, along with other control units, comprises a control gear which carries various cam gears for the mechanical actuation of several cam switches. At each actuation of the foot switch, i. In each switching process, the controlled gearbox performs, and thus the individual cam washers perform, rotating 360 ° and in turn, in a particular sequence, primarily according to the cam shape, for the various cam switches. The individual cam switches, in turn, serve to accomplish various functions, such as stroke, ie. motor drive shutdown is determined by one such cam switch.

In a known motor drive, its control is performed in such a way that after a predetermined moment of time, the motor drive is switched off within the switching sequence, which is predefined by the corresponding cam. By means of the cam washers, the respective cam gear is actuated and thus the motor drive retains the information that this switching sequence is complete and the motor drive must be switched off and thus again ready for the next gearbox. However, this information only applies to motor drive, ie. about his situation and his completed firing. Control is also exercised as to whether the respective foot switch has actually reached its new end position and whether all the structural details of the foot switch have also actually taken the new steady position, which is a prerequisite for proper functioning and, above all, for subsequent switching.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a method of controlling a motor actuator in which it can be simplified to control both its stroke and at the same time to control whether the actuated step switch has taken the correct stationary new position after switching. It is further an object of the invention to provide a step switch suitable for the method.

This object of the invention is solved by a method with the features of the first patent claim. The second claim relates to a step switch particularly suitable for carrying out the method.

Generally, the invention is based on the fact that the step switch typically has a slow and gradually actuated, non-load-selectable new deviation to be switched on, as well as a power switch for fast continuous switching between the current and the new deviation. In addition, the power switch contains an energy accumulator that is charged during the actuation of the selector, whereby a locked actuator locks the driven unit of the energy accumulator. The power switch is then actuated by releasing the energy accumulator, in particular by rapidly activating its actuated unit. The rapid actuation of the drive unit of the energy accumulator, in turn, is released in such a way that one of the locks deviates from the stationary locking position. The previously held lock of the energy accumulator is lifted. After the activation of the power switch is complete, when the step switch has completely reached the new operating position, the respective switch locks into the energy accumulator again and locks it again, with the step switch ready for the next switch. One such known step switch is described, for example, in DE 198 47 745 Cl. The corresponding energy accumulator is described separately in detail in DE 198 55 860 C1.

The invention is based on the general idea of this blocking, i.e. the position of the battery lock, which normally holds it in a fixed position, should also be used for dual registration. On the one hand, if the moment at which a lock to the energy accumulator, which was previously fixed, deviates and thus releases the energy accumulator, respectively. its drive unit, as well as the moment of shutting down the motor drive, then completes the shift. On the other hand, blocking the energy accumulator after reaching a new position is a reliable indication of a certain, safe working position. In contrast, in other cases, if the energy accumulator is not locked again, an unacceptable operating position is reached. Such a locking error may occur when the spring of the lock is on its own or the spring of the energy accumulator is, respectively. are defective. By registering the status of a properly functioning re-lock after a power switch is completed, it is also possible to control the step switch at the same time.

Explanations of the drawings attached

The invention will be further explained by way of example in the drawings, where:

Figure 1 shows a schematic representation of the process of the invention;

Figure 2 - the energy accumulator of a step switch suitable for the implementation of the method;

Figure 3 - diagram of the complete switching sequence.

Examples of carrying out the invention

First, the method according to the invention should be explained, with reference to the following later detailed description of the energy accumulator with respect to one of its constituent elements. The step switch is actuated, for example, by a control pulse from a voltage regulator when the (measured) voltage value deviates from a set value, or also by a manual pulse supply in a control room or the like. This control impulse activates according to the direction of rotation, ie. switching in the direction "higher" or in the direction "lower", one gives protection to the motor and thus also the motor of the motor drive. In addition, each of the two motor protectors has some self-restraint. By means of this actuation of the electric motor of the motor drive, the drive shaft leading to the foot switch is rotated and thus the foot switch is actuated. First, a slow pre-selection without the load of the step switch is performed first. Moving contacts of the voter reach the new fixed contacts of the voter to which he or she must switch. At the same time a voltage (charge) is exerted, i. downloading the foot switch energy accumulator. One such energy accumulator is shown in FIG. 2 and further explained in more detail. When the energy of the battery is strained, the pull-out carriage 2 shifts relative to the switch-carriage 3, whereby the tensioners mounted between the two carriageway springs are tensioned. The switching carriage 3 is thereby locked by the locking levers 6, 7 which engage in the locking support thresholds 4,5. If the full charge of the energy accumulator is reached, i. the pull-out carriage 2 has moved as far as possible relative to the carriage-carriage 3 and the energy accumulator is maximally tensioned, the corresponding locking lever 6, 7 is deflected. The switch carriage 3 is hopped. The energy accumulator springs are stretched. In its hopping motion, the switch carriage 3 thus triggers the power switch of the foot switch, which switches under load between the stationary contacts of the selector. This deviation of the respective locking lever 6,7 is recorded according to the method according to the invention. The information resulting from such a deviation causes the motor to be stopped. The switching process is thus complete. After some time, when the foot switch is in the new, stationary position, then it is also checked that the energy accumulator is again locked and thus in the correct position and ready for the next actuation of the foot switch. For this purpose, it is monitored whether one of the two locking levers 6,7 is fixed again. Always at one time one locking lever (the energy accumulator has two such locking levers 6, 7, of which always one alternating, with each switching) is respectively in the left or right of the two possible positions of the energy accumulator whose switching sleigh 3 is fixed.

If neither of the two locking levers 6, 7 is in the fixed position, the energy accumulator is not locked. If there is a defect that causes the motor to be blocked, then no switching is possible and subsequent damage is avoided. First of all, in this case, the defect that led to non-blocking should be eliminated.

In FIG. 2 depicts a power switch of a step switch suitable for carrying out the method described. For certain individual details of the above battery, a reference has already been made in connection with the explanation of the method. The energy accumulator consists of three basic structural units: base plate 1, pull-out sled 2 and switch sled 3. This construction is already known from the prior art. The pull-out carriage 2 is driven linearly by the motor drive. It is full of longitudinal displacement. Springs between the energy accumulator are mounted between it and the switchgear 3, not shown in the figure. The switch carriage 3 has side latching projections 4.5. In addition, there are provided two lateral locking levers 6, 7 which each have a locking roll 8,9, which in turn correspond to one of the locking projections 4,5. The pull-out carriage 2, as explained, moves when actuated by the motor drive, therefore in the longitudinal direction, while the carriage-carriage 3 remains in its present position, since it is locked by the locking rollers 8 or 9 of the locking levers 6 or 7, which abut in the corresponding projection 4 or 5. When the withdrawal carriage 2 reaches its end position in its longitudinal motion, according to the direction of travel, one of the locking levers 3 or 4 is pressed down against the force of the respective spring of the locking lever 10 or. 11. Further, the respective locking roller 8 or 9 is in external contact with the corresponding locking projection 4 or 5. The locking of the switching carriage 2 is thus preserved and it follows in a jumble the movement of the carriage 2, with the energy accumulator being tensioned and the locking rollers 8 or 9 move to the new end position of the switching sled 3, again in contact with the corresponding locking projection 3 or 4 - the locking is restored again. The next time the foot switch is activated, the process is repeated in the opposite direction. Therefore, the pull-out carriage 2 always alternately moves to the left or right, and the carriage-carriage 3, after termination of its fixing, which initially holds it, follows this movement. This movement is further transmitted through the coupling element 12 to actuate the power switch.

Sideways, near the locking rollers 8, 9 of the locking levers 6,7 according to the invention are provided proximity sensors 13,14. Proximity sensors 13.14 record the position of the corresponding spatially locking lever 6.7. In the example presented here, the proximity sensor 13 registers the position of the locking lever 6, and the proximity sensor 14 registers the position of the locking lever 7.

The corresponding proximity sensor 13, 14 produces an electrical signal when the respective locking lever 6,7 is in the locked position. Each of the signaling conductors 15, 16 coming out of the proximity sensors 13, 14 is electrically connected to a blocking control. Its switching contacts are connected in parallel to the electrical control circuit of the electric motor driven motor. Therefore, the motor drive operates according to the specified control pulse for as long as one of the two lock control protections is actuated, whereby one of the proximity sensors 13, 14 transmits the signal, thereby transmitting the information that the corresponding lock lever 6, 7 is fixed. However, if the energy accumulator is actuated, the two locking levers 6, 7 are pressed by the locking device for a short time, the two locking control protectors are switched off and the control circuit is interrupted and the motor drive is stopped.

In the normal case, as already described, after the power switch is completed, the energy accumulator is re-locked, ie the control circuit is reinitialized for a new control impulse. In the event of a failure where no locking has taken place and the two lock control protections remain released (inoperative), it is impossible by applying a new control impulse to the next switch, ie. re-start the foot switch. On the contrary, the motor drive remains blocked until this damage has been rectified.

In FIG. 3 shows a switching sequence, namely a complete switching cycle from first position 1 to second position 2. In this case, the motor drive motor shaft rotates 360 °. The characteristic points in this switching sequence are indicated:

a) Starting position; The motor actuation starts with a control impulse.

b) The moving contacts of the voter begin to move.

c) The moving contact of the voter leaves the old fixed contact of the voter.

d) The moving contact of the voter reaches the new fixed contact of the voter.

e) The movement of the moving contacts of the voter is over, the energy accumulator is still being drawn.

f) The energy accumulator is maximally withdrawn, the sliding latch locking lever deflects and releases the sliding lane, which moves in a jumble and activates the power switch. At the same time, this deflection is detected by the proximity sensors 13 or 14, the two lock control protections are dropped, the motor drive is switched off.

g) The power switch is completed, the step switch has reached its new position, the energy accumulator is again blocked.

h) Switching is complete.

This figure also shows the resulting moment of inertia of the motor drive motor. After switching off the power supply, due to the inertial mass of the structural parts driven by it, the motor drive actually stops only after a certain time.

Claims

Claims (2)

1. A method of controlling a motor actuator for a stage switch, in which the actuation of the motor actuator 5 is initiated by a single control pulse 5 and, according to the principle of step-by-step switching, is automatically brought to an end, whereby the motor actuation activates the step selector of the step gradually and without load. , wherein the motor drive further pulls and pulls the retractable carriage of its consisting and switchable carriage of energy accumulator, and thus the carriageway of the carriage is initially cheese by means of locking levers and in a locked state, and finally, after full withdrawal of the energy accumulator, the locking by release of the locking levers is canceled in such a way that the switching carriage executes a fast, triggered power switch of stepping motion, , characterized in that the position of the locking levers (6, 7) is controlled and the motor drive is switched off when each of the locking levers (6, 7) is in the unlocked state and only again, on the assumption that one of the locking levers (6, 7) is again in the locked state, it is released for further activation. A step switch for carrying out the method according to claim 1, comprising an energy accumulator, which in turn comprises a linear actuator driven by a motor drive and a locked switch carriage, between which are provided springs by the energy accumulator, through which the energy actuator springs are provided. the longitudinal movement of the pull-out sled against the switch-sled is tensioned by the springs of the energy accumulator in such a way that after releasing the lock, the switch-sled follows a hopping o the movement of the pull-out sled and wherein the locking is performed by means of two locking levers, locked against the force respectively of one spring of the locking lever with one locking roller, which at rest correspond to a locking projection in the switching sled and are locked therein. with the fact that an electric proximity sensor (13,14) is mounted laterally in the area of the locking rollers (8, 9) of each locking lever (6, 7), wherein each proximity sensor (13,14) is connected electrically and a control circuit of the motor drive in such a manner that the control circuit is interrupted and thus stops the motor drive, since none of the locking levers (6, 7) is not in the locked position. Attachment: 3 figures Publication of the Patent Office of the Republic of Bulgaria 1113 Sofia, 52-B Dr. GM Dimitrov Blvd.