BG66061B1 - Electric motor drive for step voltage regulators with positions indication - Google Patents

Abstract

The electric motor drive is intended for actuating a step regulator connected thereto of the voltage under load of power transformers. The drive ensures at least one switching with an indication of the normal position as well as an indication of the step the regulator is at. Both indications are read on a frontally located panel through a window on the cover of a protection box. The electric motor drive is with a compact structure with gearings immediately connected to the two command shafts of the drive. The gearings are located in a power box and are well lubricated. The front panel has small overall dimensions and is convenient to watch the two indications. The horizontal command shaft (8) performing one revolution of switching, through a screw gearing (20), drives another shaft on theface of which there is attached a normal position indicating pulley (17). It is located in a hole on the front panel (12). The pointer (14), indicating on a scale (13) on the panel (12) on which stepthe step regulator is, is connected through a shaft and a bevel gearing (16) to the shaft (11) performing small angular rotations. In another embodiment, the worm gearing (9-10) is turned to 90 degrees and the shaft (11) is hollow and horizontally positioned. A pointer (14) is fastened to its face and the shaft is placed in its opening, the pulley (17) being fastened to the face thereof.

Description

Technical field

The invention relates to an electric drive designed to actuate step-by-step voltage regulators of power transformers. The motor drive has an indication of the normal position and of the step on which the controller is located.

BACKGROUND OF THE INVENTION

An electric motor (1) is known comprising a motor connected to the output shaft by a gear. There is a worm on the output shaft which, through a worm wheel mounted on a horizontal shaft, provides a single rotation of the horizontal shaft. A lever gear connected via a shaft of the horizontal shaft indicates by a moving line the normal position when switching is complete. The horizontal shaft, through a second worm gear, a vertical shaft and a digital tape disk, indicates the step on which the foot controller is located.

The disadvantage of this electric motor is that it cannot indicate the position of the step with the arrow on the front panel, as required by some international standards. Another disadvantage is that the indication of complete switching is far from the position indication and does not take into account the position of the actuator in the event of a possible stop in the intermediate position.

Another electric actuator (2) is known, in which the indication of the position of the step is read on a scale by an arrow on the front panel. With two additional arrows, the end steps that are reached during operation are fixed. There is a washer on the same front panel that indicates the normal position. The two indications are connected via a multi-stage gear.

The disadvantage of this electric drive is that it cannot be applied in the case of a horizontal shaft with one gear change having a lateral outlet.

Another disadvantage is that the front panel is of complex construction and has a relatively large area for positioning the indicators. This requires a larger viewing window on the cover of the protective box.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a drive motor for step regulators with a frontal indication of the normal position and a step with a compact construction in which the gears are simplified and directly connected to the shafts of the two worm gears.

The problem is solved by electrically driven step-step voltage regulators, comprising a shaft making one switching turn and a washer indicating a normal position on the front panel, a second shaft performing small angular rotations and an arrow indicating on the scale of the front panel of which step the actuator according to the invention, the washer is directly connected to a shaft making a switching turn, and the arrow is connected directly to the shaft making small angular rotations. Different types of gears are used for connecting elements.

Alternatively, the washer is mounted on a shaft connected to a shaft that performs a single gear changeover through a helical gear, and the arrow is located on a shaft connected to a shaft making small angular rotations through a conical gear.

In another embodiment, the shaft to which the arrow is connected is hollow and horizontally positioned, with a shaft mounted inside it, at one end of which the washer is mounted, and at the other end, it is connected to a shaft that performs a rotation through the front cylindrical gears and conical gears.

The advantage of the electric drive according to the invention is that a compact construction is achieved in which the gears are connected directly to the two control shafts and are provided with good lubrication in a closed power box. Another advantage is that the front panel is smaller and more convenient to monitor.

66061 Bl

Explanation of the annexed figures

An exemplary embodiment of the motor drive for step voltage regulators according to the invention is shown in the accompanying figures, of which:

Figure 1 is a spatial kinematic diagram of an electric drive, in which the position indication is made by means of a helical gear and the foot indication by a conical gear, both indications being in the same zone;

FIG. 2 is a spatial kinematic diagram in which the position indication is located at the center of the occurrence scale.

Examples of carrying out the invention

Motor 1 (Fig. 1) rotates the drive shaft 2 of the drive through the shaft 3, a small gear 4 and a large gear 5. The worm 6 of the output shaft 2 is engaged by a worm wheel 7, which is mounted on the control shaft 8. The command shaft 8 makes one switching turn and is associated with known control units not shown. From the shaft 8, the shaft 11 is rotated by small angular steps through a worm 9 and a worm wheel 10. The shaft 11 is connected to known non-shown devices that provide electrical position indication and various end locks.

On the front panel 12 there is a scale 13 showing the number of steps by an arrow 14. The arrow rotates from a shaft 15, which receives movement from the shaft 11 through a gear 16 of conical gears. The front panel 12 has an opening that shows a washer 17 showing through the sector 18 and the arrow 19 located on the panel 12 the normal position of the actuator. The washer 17 is rotated one turn from the control shaft 8 by means of the helical gear 20 and the shaft 21. The friction-locked arrows 22 are moved by the arrow 14 and indicate the reached end positions during operation.

Another embodiment of the motor drive is shown in FIG. 2. The same as in FIG. 1 items are marked with the same numbers. The worm wheel 10 is rotated 90 ° and through the shaft-like shaft 11 is connected to the arrow 14. The washer 17 is located in the center of the scale 13. It is connected to the shaft 8 by a conical gear 23, a front gear 24 and arranged in tube shaft 11 shaft 21.

The action of the motor drive is as follows. The output shaft 2 (Fig. 1) is rotated by the motor 1 through the gear gear 4-5. In this case, the worm gear 6-7 provides the horizontal command shaft 8 with a single gear changeover. This is guaranteed by an unspecified known controller. Through the second worm gear 9-10 shaft 11 performs small angular rotations of each switch. The helical gear 20 rotates the shaft 21 also one turn of a gear. A shaft 17 is connected to the shaft 21, which through the sector 18 and the arrow 19 indicates that the motor drive has stopped in the normal position. The washer 17 is inserted into an opening of the front panel 12, on which is shown a circular scale 13 arranged in as many positions as guarantees the actuation (eg 40). The arrow 14 is carried by a shaft 15 which is connected to the shaft 11 by a conical gear 16. The arrow 14 indicates on the scale 13 the position of the actuator. At the request of the customer, two friction fixed 22 arrows can be mounted to indicate during the operation to which end positions the actuator has reached.

The effect of the embodiment of FIG. 2 is analogous. In this case, the worm gear 9-10 is rotated 90 °. The worm wheel 10 is connected to the hollow shaft 11, at the end of which the arrow 14 is mounted. The washer 17 is located in the center of the scale 13 and is connected to a shaft 21, which is mounted in the hollow shaft 11. The shaft 21 rotates one revolution. of shifting from shaft 8 through a conical gear 23 and a cylindrical gear 24.

Claims (3)

Claims 1. Electric actuator for step-by-step voltage regulators with position indication, comprising a shaft rotating one turn and a washer indicating normal position, a second shaft making small angular rotations, and an arrow indicating on the scale of the front panel of each step e 66061 Bl actuator, characterized in that the washer (17) is directly connected to a shaft (8) performing a single rotation of the switch, and the arrow (14) is connected directly to the shaft (11), making small angular rotations, such as gear units are used gears. Electric drive according to claim 1, characterized in that the washer (17) is arranged on a shaft (21) connected to the shaft (8) by means of a helical gear (20) and the arrow (14) is arranged on a shaft ( 15) connected to the shaft (11) by a conical gear (16). Electric motor according to claim 1, characterized in that the shaft (11) to which the arrow (14) is connected is hollow and is horizontally arranged, with a shaft (21) at one end of the bearing therein. which is mounted the washer (1) and at its other end is connected to the shaft (8) by a front cylindrical gear (24) and a conical gear (23).