SU1302358A1 - Brush-commutator assembly for reversible electric machine - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to electrical engineering and relates to the design of the slot-collector y: and reversible electric machine. The aim of the invention is to increase the reliability of the brush contact and increase its resource by increasing the stability of the contact. The brush-collector assembly contains H1, mesh 1, a sheath holder made in the form of a single-arm lever 2 and 3, a support, a pressure spring, brush movement stops on the collector 9 in the tangential direction, a base of stops and a support. The one-arm lever is located in a plane parallel to the axis of rotation of the collector, and consists of a connected elastic part and a rigid one. The brush 1 is rigidly fixed on the free end of the elastic part of the lever 2. The tension spring 6 is located between the brush 1 and the supports. The arm lengths of the arms 2 and 3, the distance between the supports 4 and 5, and the maximum height of the brush are determined from the relation: t 2rl (./li, where | d, is the coefficient of friction 1 for collector 9; g is the maximum height brushes 1; Ep, n - the length of the shoulders, from the lever supports, respectively, to the axis of the brush 1 and to the heel point of the pressure spring 6 to the lever. 3 ill. (O (L tp with about JV with SP 00 (Par.1

Description

The invention relates to electrical engineering and concerns the design of the brush-collector assembly of a reversible electric machine.

The aim of the invention is to increase the reliability of the baby contact and increase its radius by increasing the stability of the contact.

Figure 1 shows the node along the longitudinal axis of the collector; FIG. 2 is a section A-A in FIG. I; on fig.Z - one-shoulder lever, top view.

The brush-collector unit (Fig-3) contains a brush 1, a brush holder 2, 3, made in the form of a single-arm lever, supports 4 and 5, a pressure spring 6, limiters 7 and 8 of movement of the brush along the collector 9 in the tangential direction, the base of the limiters 10 and the caliper 11. The single-arm lever is located in a plane parallel to the axis of rotation of the collector 9 and consists of connected elastic part 2 and rigid 3. Brush 1 is rigidly fixed on the free end of the elastic part of the lever 2. The free end of the rigid part of the lever 3 rests on supports 4 and 5 located simme tricno relative to the longitudinal axis of the one-arm lever. The tension spring 6 is located between the lash 1 and the supports 4 and 5. One end of the spring 6 is connected to the base 10, and the other end is connected to the single-arm lever in the connection zone of the elastic part of the lever1 -a 2 with the rigid part 3. Arm length 2 and 3, the distance between the supports 4 and 5 and the maximum height of the brush is determined from the cone.

to c2g fp / In.

coefficient of friction of the brush 1 about the collector 9;

the maximum height of the brush I; the length of the arms from the supports 4 and 5 of the lever, respectively, to the axis of the brush 1 and to the point of attachment of the pressure spring is about 6 to the lever.

In this design of the brush-collector assembly, the brush 1 rests in one of the stops, for example 7, only the lower part, which reduces the oscillation of the brush 21 in the tangential direction, as a cantilever beam.

The use of the elastic element 2 of the lever allows eliminating the resonance of the brush 1.

To do this, it is necessary that the natural frequency of oscillations of the subsystem brush-contact layer be equal to the natural frequency of the rigid element of the lever. This condition is satisfied when

CR KK i:

chaga stiffness;

JtlTlP m

14 elastic

- To

element ry

5 p 5 0

about

five

KK.C - stiffness of the contact layer;

gpr - the reduced mass of the rigid part of the lever;

mui is the mass of the brush;

 pressure spring stiffness.

Tests on the contact ring of the experimental setup showed that the proposed brush-collector unit of the reversible electric machine, as compared with that known, can significantly increase the contact stability. As a result, the frequency of rotation of the slip ring is permissible, with a kofopoy, a koptakt rupture and sparking begin, more than doubled.

Claims (1)

Claims of the brush-collector assembly of a reversible electric machine comprising a collector, brush, brush holder made in the form of a single-arm lever parallel to the axis of rotation of the collector, at one end of which a lash is rigidly fixed, and the other end of the lever rests on two supports, each of which is located symmetrically with respect to the longitudinal axis of the lever and fixed motionless; a compression tension spring connected at one end to a lever between the brush and the supports; the other end of the spring fixed at movingly, characterized in that, in order to increase the reliability and increase the life of the brush contact by increasing it and its stability, two restrictors were introduced to replace the grids along the collector in the tangent direction, 1note in the form of cantilever elements and located on the side of two opposite The lateral surfaces of the upper part of the umbilical cord are in such a way that the contact of each limiter with the corresponding surfaces of the brush is oswestled along a straight line, the passage of the pgey in the axial n-direction is parallel the collector plates, and the surfaces of the limiters adjacent to the lateral surfaces of the brush, are scattered across its entire length, the single-arm lever is made of two parts rigidly interconnected, with one part of the lever rigid from the side of the supports rigid and the other from the side of the brush elastic , arpchem the stiffness of the elastic part of the bending arm is determined from the expression D.-IfTPP-p L; Dcs - TO elastic element rygde K /, - stiffness of chaga; stiffness of the contact layer; reduced weight of the rigid part of the lever; the mass of the brush; spring stiffness the spring with the free end is connected to the junction of the two parts of the lever. /(.p. shooting gallery - mm - K 9u2 .2 Editor G. Volkova Order 952/52 VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4 (Rig.d. Compiled by V. Volkov Tehred I. VeresKorrektor T. Kolb Circulation 626 Subscription