SU1488903A1 - Brush assembly of electric machine - Google Patents

Description

The invention relates to electrical engineering and can be used as a rotating collector device in DC and AC machines. The goal is to increase the reliability of the brush unit by increasing the steady

mk work brush when reverse. The brush assembly consists of a plastic yoke 1 with guide windows for brushes 3. A pressure roll spring 4 interacts with the non-working end of each brush, fixed on a flat base plate 5 on one of the walls 6 of the cross bar 1. Towards the working end of the brush 3 from the place 7 fixing on the support plate 5 is made of a coil spring 4 with a free section, which has a bent convex part and the top of this part interacts with the side surface of the brush 3, pressing the brush to the opposite wall of the window cross member 1. Traverse and 1 consists of two halves with guide surfaces for the brushes located in them. Half crossheads are interconnected by screws. 3 il.

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The invention relates to electrical engineering and can be used as a rotating collector device in electric

AC and DC machines.

The aim of the invention is to improve the stability of the lateral preload brush when. reverse operation mode of the electric machine.

FIG. 1 shows the brush assembly, a section along the brush; in FIG. 2, view A in FIG. one; in fig. 3 - roll spring with base plate. 15

The brush assembly comprises a traverse 1 with guide windows 2 for brushes 3.

With each brush 3 interacts pressure roll spring 4, mounted on a flat support plate 5 20

on one of the walls of the window 6 traverse 1.

Aside from the working end of the brush 3 from the fixing point 7 on the supporting Plate 5, there is a roll spring with a free section 8, which has a bent convex part 9 and the top of this part interacts with the side surface of the brush 3, pressing the brush to the opposite 'window wall 2 cross braces 1. The free 30 section 8 of the spring 4 can be made multi-bend to allow the side force of the brush to be controlled. 3. The cross bar 1 for easy assembly and to obtain precise guide surfaces for the brushes is made of two halves, which are connected, for example, with screws 10. The support plate 5 is made with a bend 11 at the end. Bend 11 49

plate 5 engages with the protrusion 12 of the crosspiece 1 and forms the lower support of the spring 4. To reduce the required lateral force generated by the free section 8 of the spring 4, the upper part of the brush is made with a bevel at an angle of about 30. To protect the brush from breakdown on the body through the air, if there are no protective covers, the brush 3 and spring 4 can be insulated with covers 13, which can also serve as a connection point for the brush 3 and lead wire 14. Their attachment can be accomplished with a screw 15. $ 5

The node works as follows. The vertex of the convex part of the free

section 8 of the spring 4 presses the brush 3 to the side surface of the window traverse 1

with a force which is directed opposite to the frictional force _Tm of the brush 3 while rotating about the collector manifold counterclockwise. The force is chosen to be large in magnitude to the friction force K _t , thus the brush 3 remains pressed against one supporting surface of the window 2. The normal pressure of the coil spring 4 to the inclined surface of the brush 3 creates a component force directed in one direction with a force Y,. Thus, the magnitude of the force can be reduced. When the collector rotates clockwise, all the indicated forces are directed in one direction and the brush remains pressed to the same surface.

Installation and removal of the spring is as follows.

After the brush 3 is inserted, the plate 5 by the lower bend 11 and the free section 8 are inserted into the groove between the brush 3 and the crossmember 1. In this case, the convex part 9 of the free section 8 abuts against the side surface of the brush and presses the bend 11 against the wall 6 of the cross member 1, upon further reaching the bend 11 of the position below the protrusion 12, they engage, and the coil spring 4 abuts against the brush 3, unwinds and presses it against the collector.

To remove the plate 5 with the spring 4, it is necessary to slightly push the plate 5 down and to the side of the brush, overcoming the force of lateral pressing of the section 8, with the mouth bend 11 coming out of engagement with the protrusion 12, after releasing the plate 5 up under the action of the coil spring 4 plate 5 out of the groove between the brush 3 and traverse 1.

Thus, the reliability of the brush unit is ensured by increasing the stability of the brush when reversed, the brush is precisely guided and centered, the node has a simple structure.

Claims (1)

Claim The brush unit of an electric machine, containing a traverse made of insulating material, with guide windows for accommodating brushes, interacts with a non-working end of each brush; 1488903 6 Lena on the support plate, which is mounted on one of the walls of the window cross member, characterized in that, in order to increase the stability of the lateral preload of the brush during reversing operation of the electric machine, the end of the spring is provided with a free section having a convex the part, the top of which interacts with the side surface of the brush, so that the brush is pressed against the opposite wall of the crossbar window, a bend is mounted on the lower end of the support bar, mounted on a ledge made on the cross bar. ΒιιίΑ Fi & W