SU1644254A1 - Electric drive - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to simplify the design and reduce the size of the drive. The electromechanical drive contains an electromagnet, a friction-wedge mechanism (FCM) 1 with a leading ferromagnetic ring 2, a current breaker 3, a return spring 4 and adjustable stops 5 and 6. The anchor (I) 7 has an annular shape, made in the form of a single node with the leading ferromagnetic ring 2 of FCM 1 and is covered by the lateral sides of the U-shaped core 8, on the basis of which the coil 9 is placed. The outer surface I 7 and the inner surface of the U-shaped core 8 are provided with bevelled teeth 10-17 and 18-25, respectively, Assumption one against the other. I 7 has two protrusions 26 and 27, and the protrusion 27 can interact with the return spring 4 and the adjustable stops 5 and 6, and the protrusion 26 with the rod 28 of the current interrupter switch 3. The tilt-and-return movement I 7 with the leading ferromagnetic ring 2 ensures the rotation of the roller FKM 1, and then the remote on or off of the automatic switch. 1 h. n. f-ly, 5 ill. (Ls

Description

The invention relates to electrical engineering, in particular to electrical actuators for remote control of automatic switches of electrical equipment.

The purpose of the invention is to simplify the design and reduce the size.

FIG. 1 shows the proposed electromechanical drive; in fig. 2 - part of the toothed area with a working gap two times smaller than the non-working; in fig. 3 - working area with a working gap of three times less non-working; FIG. 4 shows the proposed electromechanical drive with short-circuited turns; in fig. 5 - part of the toothed area with short-circuited turns.

The electromechanical drive contains a friction-wedge mechanism 1 with a leading ferromagnetic ring 2, an interrupter switch 3 and a return spring 4, adjustable stops 5 and 6 defining the final position of the core 7, which has a ring shape and is made in the form of a single unit with a leading ferromagnetic ring 2 friction K

Ј

ND Sp. B.

wedge mechanism 1. The anchor 7 is covered by the lateral sides of the U-shaped core 8, on the basis of which the coil 9 is placed. The outer surface of the core 7 and the inner height of the U-shaped core 8 (pole pieces) are provided with bevel teeth 10-17 on the bark (total eight), and oblique teeth 18-25 on the core 8 (also eight), located against each other. On the bark 7 are the protrusions 26 and 27, and the protrusion 27 has the ability to interact with the return spring 4 and adjustable stops 5 and 6, and the protrusion - with the rod 28 of the switch - the current interrupter 3. The fastening of the electromechanical drive is carried out by screws 29-32. In the grooves of the non-working air gaps between the beveled teeth 10-17 on the bark 7 and the beveled teeth 18-25 on the core 8 can be installed short-circuited coils 33-46 (see. Fig. 4). The working air gap, for example, between teeth 10 and 18, is performed by building mutually perpendicular lines from the points of beginning and end of the angle of one section (ac. In Fig. 1) on the forming circle of the teeth of the pole pieces of the core 7 and core 8, and the bevelled surfaces of the the teeth of the magnetic cores of the working air gaps of the core 7 and the core 8 are perpendicular to the straight line passing through the point on the generatrix of the teeth of the pole tips of the core 7 and the core 8 located at a distance of 1/4 of the section angle (1/4 OuCH) from Start the top left side of the pole piece counterclockwise. This straight passes through the middle of the width of the surface of the tooth of the core tangentially to a circle with a radius of 0.4-0.6 of the radius forming the circumference of the pole pieces. The beveled surfaces of the teeth of the core are located opposite to the working beveled surfaces of the teeth of the core at a distance equal to half the width of the beveled surface of the tooth of the core,

. “Spolyusn

auch

where "pole - the angle of arrangement of one pole tip of the core or core, equal to 120-150 ° and located at a distance, for example, 30 ° to the left of the vertical axis;

n is the number of teeth of one pole tip;

 IMPOLIUS tnpna.

K & full 1c

where tnpnu- drive time;

1c is the time of one cycle of the drive operation, consisting of the time of one turn and the return of the core to the initial position; Schtoln angle of rotation of the shaft of the mechanism

and an eccentric from one switching position to another, equal to 180 °:

K - coefficient taking into account the presence of the inertial coasting mechanism, equal to 1.8-2.3.

A variant of an electromechanical drive with higher efficiency is shown in FIG. 4 and 5, where in the zone of non-working air gaps (slots) of the core 7 and the core 8, short-circuited coils 33-46 are installed for higher efficiency of the device.

An electromechanical actuator for remote control of automatic switches operates as follows.

0 When applying a control pulse to the coil 9 between the beveled teeth 10-17 core 7 and the beveled teeth 18-25 of the core 8 forming the working air gaps, an electromagnetic force and a total total torque are generated, causing the core 7 to rotate by a certain angle over time action of current pulse. Together with the core 7, the friction-wedge roller is rotated

0 of the mechanism 1, which is mechanically connected through the eccentric to the drive carriage (not shown in Fig. 1).

The force FI generated by the magnetic flux through the working air gap in each section when a current pulse is applied to the coil 9 is several times greater than the force Fa in the non-working gap due to the fact that, for example, at equal areas of the ends of the working and non-working magnetic cores

0 air gaps working gap is two to three times smaller than the non-working one and in accordance with Ohm’s law for a magnetic circuit

Umum

RMRMI Yam2

F

five

0

five

RMI + RM2

the magnetic flux is inversely proportional to the magnitudes of the magnetic resistances of the working and non-working air gaps (or directly proportional to the magnetic conductors of the holes)

F UM (GMI + GM2), where F is the magnetic flux;

DM is the magnetizing force (amperitic);

RMI; Rn2 magnetic resistances of working and non-working gaps;

GMI; CM2 is the magnetic conductivity of the working and non-working gaps;

0- / Yu-1-,

where / io is the magnetic permeability of the air;

S is the area of the ends of the teeth of the magnetic core and core, creating an air gap;

d - the length of the air gap;

Accordingly, the magnetic induction in the working air gap is two to three times higher than in the non-working, while the force FI, determined by the simplified Maxwell formula, depends on the square value of

nor magnetic induction FI -. will be in

4-9 times the force Pg with equal surfaces S of the ends of the teeth of the pole pieces, which form the working and non-working air gaps. The geometrical dimensions of one section (see Fig. 1) of the core 8 and core 7, creating working and non-working gaps, are determined by the following parameters

D, R is the diameter and radius of the core of the core, defined constructively, based on the dimensions of the ferromagnetic ring of the friction-wedge mechanism in the cross section of the core magnetic circuit;

g is the shoulder of action of the resultant force FI of the region, equal to 0.5R;

FI is the direction of action of the resultant force in the working air gap, defined as tangent to a point on a circle D located at 1/4 "area. from the point of the beginning of the section counterclockwise, to a circle with a radius of r;

A is a straight line segment, perpendicular to FI, from the point of the beginning of the section of the heading to the intersection with the line drawn from the point of the end of the section of the area Uch parallel to FI;

B is the length of the working gap, which is the size of the perpendicular to the distance drawn from the middle of segment A, equal to 0.25 segment A.

When the stress is relieved, the bark 7 with the lead ferromagnetic ring 2 under the influence of the return spring 4 returns to its original position. The rotational-return movement of the core 7 with the leading ferromagnetic ring 2 ensures the rotation of the roller of the friction-wedge mechanism, and then the remote activation or deactivation of the automatic switch.

An example of a specific implementation of an AC drive with a frequency of 50 Hz with the following parameters:

1priv 0,24 s (from experimental data);

, 02 s (for a network frequency of 50 Hz);

Ampl. 180 ° (transfer from one to another switching position);

Opo yusn. 120 ° (from taking into account the presence of the coil and other structural elements);

OPOLUS. tnpMB.

K Opoln 1ts

120 ° 0.24

h u (

2 180 ° 0.02

where does the corner of one section

 The poles 120 4

“Account -

30 °

The geometrical dimensions of the electromagnetic drive (see Fig. 1 and 2) are made,

starting with an angle of 30 ° to the left of the vertical axis, by taking into account the presence of structural elements and reducing the leakage flow with a pitch of the sections equal to Oouch. 30 °. Other areas of the pole ends of the left side are similarly made.

The sections of the pole tips of the right side are made, starting at an angle of 50 ° below the vertical axis, similar to the previous one on the left side.

Thus, the proposed electromechanical drive, due to the compact combination of the core with the leading ferromagnetic ring of the friction-wedge mechanism and the reduction in the number of coils and wiring connections, has a simpler design and smaller dimensions than the known electromechanical drive, which allows it to be used for remote control of small-sized automatic switches series.

Claims (1)

Claim 1. Electromechanical actuator for remote control of automatic switches, comprising an electromagnet, a friction-wedge mechanism with a ferromagnetic lead ring, a circuit breaker and an interrupter and a return spring, characterized in that in order to simplify the design and reduce the size, it is equipped with adjustable stops, measles has a ring-shaped form, is made with two protrusions in one piece with the lead ferromagnetic ring friction-wedge mechanism and covered by the lateral sides of the U-shaped core, on the basis of which the electromagnet coil is placed, on the outer surface of the core and the inner surfaces of the lateral sides of the U-shaped core are made oblique teeth arranged opposite one another with a gap; interoperability with a current-circuit breaker and the other with possibility of interaction with the return spring and adjustable stops. 2, Drive according to claim. 1, characterized by the fact that it is equipped with short circuits coils of electrically conductive material installed in the grooves between the beveled teeth of the core and the sides of the U-shaped core. thirty Working clearance nineteen HF; 26 P Non-working clearance 2 Fig.Z W itB 39 45 FIG. ft ft P