LT4962B - Star-to-triangle switching element - Google Patents

Abstract

The invention relates to a switching element star - a triangle that allows to switch on, run and operate asynchronous electric motors and successfully replaces the current version of the contactor combinations with over 4 kW power, but does not limit its use anywhere. The inventive concept of the switching element described in the present invention provides three independent positions which are transmitted through the transmission elements to the contact section, where the movable support of the flexible contacts covers their respective contacts by their movement, which first of all ensures the supply of electric motor energy to the star (Y) with feedback to the star point and to the star point. after a certain time, the energy supply to the triangle (D). This is accomplished by the fact that the control element consists of two fixed fixtures 1 held fixed by special loops 3, 5, separated by separating plates 6, which simultaneously serve a guide fitting 2 with an opening c in which a movable metal support 7 is provided as follows that the movement of the reinforcement 2 is limited

Description

The invention relates to a star switching element, a triangle, which enables the asynchronous electric motors to be switched on, started and running, and successfully replaces existing versions of the combinatorial combinations for the control of asynchronous motors of over 4 kW. In general, the invention is in Class H01H of the International Patent Classification and / or more specifically Class 03/46 of H01H.

The technical problem is successfully solved by the aforementioned invention comprising the design and construction of a switching element that allows for a successful combination of multiple contactor elements, particularly where a single element can replace a combination of two or three contactors as required by existing solutions and and control sections between contactors must be correctly wired, otherwise the unit may be damaged or even damaged.

Solutions to the technical problem that have been raised exist, for example, that the starting and operating system of electric motors over 4 kW has three standard contactors and a time relay for star-triangle switching (patent FR 2130 030, published 1972). The correct operation of such a unit requires the correct connection of the wires of the power contacts of all three contactors, which is physically heavier on the higher power units which have larger cross section wires.

The closest known is the star-triangle switching element, which has a cover part, a contact part and an electronic part under one cover cap. Its controlling part is provided with two rollers connected via two fixtures and a lever with a contact part (International Application WO 9601486. Published 1996).

A general technical solution to the problem of the invention is formulated with the help of the features of Claim 1 of the Invention, and the additional Claims of the Claim specify the implementation of the idea of the invention.

The design concept of the switching element of the present invention provides for three independent positions which transfer the transmission elements to the contact sections where the movable support of the flexible contacts closes the corresponding contacts by moving it first to the electric motor power star (Y) with reversible connection to the star points , and after some time, the power supply triangle (D) which l () corresponds to the nominal voltage of the electric motor windings, double step actuations Yl). The contact system ensures smooth operation and greatly simplifies traditional contactor combinations using three contactors and an on-time relay. The switching time is adjustable and depends on the load of the electric motor, t) the starter position is signaled.

The star-triangle switching member as described in the present invention will be explained in more detail on the basis of specific examples and the accompanying drawings, in which:

Fig. 1 is a star-triangle, cross-sectional and frontal view of the invention.

Fig. 2 illustrates a star-triangle, cross-sectional and longitudinal view of a switching member according to the invention.

Fig. 3 illustrates a star-triangle, cross-sectional and top view of a switching member.

Fig. 4 is a star-triangle, cross-sectional view 50 and a side view of the invention.

The control element consists of two fixed reinforcements 1 and one movable reinforcement

2. Fixed reinforcement 1 timing rollers 4, 5 secured with special loops 3. each of the coils, when connected, corresponds to one of the actuating / joining of the switching element described in the present invention. Between them is an F-shaped fixture hooked

2; as it moves along the side of the metal guide 6, at the same time it ensures the proper arrangement of the fixed fixtures 1. The movable reinforcement 2 in the off position of the coils 4, 5 is unloaded, which corresponds to the third off position of the element. The movable armature 2 transmits effort through the steel support 7 and through the transmission lever S to the movable support 10, 11, 12 of the movable support 9 in the contact section of the connecting member.

The inputs of the fixed contacts L1, L2, L3 are located on one side of the connecting element, and the UI of the fixed contacts. Outputs VI.W1 and U2, V2, W2 - on the other side. which corresponds to the marking on the electrical motor circuit board. The contacts are covered with two insulating caps 31 with holes for connecting cables.

With the spool 4 in the connecting position, the movable support 9 holding the contacts 10, 11, 12 slides into position a. The load current flows from the input of the fixed contacts L1, Ll, L3 through the movable contacts 11 to the output of the fixed contacts Ui, VI, W1 and through the winding wires of the electric motor. The ends of the windings are connected to fixed contacts U2, V2. W2 where the stars

21) Point 13 is closed by a movable contact 10. A voltage of 230 V (Y) is applied to the electric motor windings and the motor rotor reaches 2/3 of the rated load. At the end of the On Time, the spool 4 becomes inactive while the spool 5 becomes active and causes the movable support 9 with contacts 10, 11, 12 to move to position b. In this way, the star point 13 opens and the current flows through the flexible contacts 11, 12 and the permanent contacts UI. VI,

W1 and U2, V2, W2 i electric motor windings. At this point, a voltage of 400 V (D) is applied to the windings of the electric motor, which is the rated voltage of the electric motor, and the rotor reaches a nominal rotation and consequently ensures continuous operation.

The star-triangle switching element is controlled like every normal

3o contactor either on circuit 01 or via remote control key ON / OFF ”; it can be mounted on a standard bracket bar or fixed with screws.

Claims (8)

DEFINITION OF INVENTION 1. A star-triangle switching element having a controlling section. consisting of two coils, two fixed fixtures and a lever, and a contact system, characterized by 5, characterized in that the two fixed reinforcements (1) in the control section are fastened by special loops (3) on the reels (4, 5), which are separated by a separating plate (6) which simultaneously serves as guiding connected reinforcement (2) with openings (c) ) into which the movable metal supports are placed in this way. that the movement of the armature (2) is restricted. Star-triangle switching element according to Claim 1, characterized in that the movable metal support (7) can move vertically along the grooves of the housing (32) and its lower part (14) is adapted for mounting a round head (15) of the transmission lever (S). The star-triangle switching element according to claims 1 and 2, characterized in that the coil body ( 4, 5) the two retractable loops (3) of the base can be hooked behind the two teeth (16) of the respective coils (4, 5). 4. The star-triangle switching device according to claims 1 to 3, characterized in that the transmission lever (8) is movable inside the semi-circular support of the housing (18) by virtue of its round thick central part (17) and also by the inserted sliding support (19). ), in a fixed steel compression ring (20) in the housing groove where two round heads (15, 21) on the transfer lever (8) laterally allow movable parts 25 move vertically and slide horizontally. The star-triangle switching element according to claims 1 to 4, characterized in that the contact system has two switching positions and one switching position when the three input connections (Ll. 1.2. 1.3) are arranged on one side π six. The 5u output junctions (UI. VI. W1, U2. V2, W2) are arranged on the side of the kilo switching element such that the double fixed lines (22) of the two lines have one common point of connection (23). 6. The star-triangle switching element according to claims 1 to 5, characterized in that, due to the double function, the movable contacts (11) are fixed between the springs (24) and the star point (13) is enclosed in an insulating chamber (25). three-phase fields (26) as allowed by the special shape of the movable contacts (10). 7. The star-triangle switching element according to claims 1-6, characterized in that wires are run along the supporting wall (27) to one part of the control elements (28) and terminals (29) for controlling the control coils (4, 5). , when the neutral-off position of the element is secured by the springs (33). 8. The star-triangle switching element according to claims 1-7, characterized in that the covering part of the element (30) also fixes fixed contacts (L1, L2, L3) and (U1, VI, W1, U2, V2, W2). ) with openings for the load terminals Insert into the respective grooves (32) of the housing the lateral covering insulating parts (31).