Mathematical modelling in the problems of dynamics of brush-commutator unit: taking into account the conditions of the contact conservation possibilities
Abstract
The article focuses on the features of the dynamics of unilateral interactions of the elements of the brush-commutator unit of the traction electric motor of an electric locomotive within the scope of the problems of determining the conditions of motion without a gap interpreted as the quality factor of a current pick-up in dynamic loading processes. A mathematical model for the interaction of a brush, a collector surface and a pressing mechanism is proposed, which takes into account the possibility of contact failure depending on the parameters of the elements of the brush-commutator unit and the force factors including the effects of the vibrations of the traction motor body. The positivity of the complete reaction was used as the criterion for maintaining the contact. An analytical form of the conditions for the continuity of the contact between the elements of the brush-commutator unit is obtained on the basis of a comparison of the static and dynamic components of the complete reaction. The work shows the dependence of the analytical conditions of the continuity of the contact on the choice of the system parameters. It proposes a graphic-analytical method for determining the parameters ensuring continuity of the brush holder for the limiting stiffness of the pressing mechanism.
- Publication:
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Journal of Physics Conference Series
- Pub Date:
- March 2019
- DOI:
- 10.1088/1742-6596/1210/1/012110
- Bibcode:
- 2019JPhCS1210a2110O