REDUCING TORQUE AS A MEANS OF PREDICTING THE SERVICE LIFE OF CARBON BRUSHES IN SINGLE-PHASE COMMUTATION MOTORS

DIE DREHMOMENTMINDERUNG ALS HILFE FUR DIE BEWAHRUNGSPROGNOSE VON KOHLEBURSTEN AUF EINPHASENKOMMUTATORMOTOREN

The torque of single-phase commutator motors drops at less than 300 rpm and reaches a minimum at zero speed under a full magnetic field at constant intensity. This drop varies according to the type of brush used. For the DB's BR 151 locomotives, the reduced torque at zero speed varied between 0.837 to 0.935 times the normal torque. Wear on brushes and commutator motors varied in parallel with the reduction in torque. The correlation between the two is sufficiently regular as to provide a means of predicting the service life of new types of brushes. However the negative commutation curve does not provide any significant information.

• Corporate Authors:

  Verlag R Oldenbourg

  Rosenheimer Strasse 145
  Munich 80,   Germany 
• Authors:
  • Herrmann, W
• Publication Date: 1977-6

Language

• German

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 141-144
• Serial:
  • Elektrische Bahnen
  • Volume: 48
  • Issue Number: 6
  • Publisher: Verlag R Oldenbourg

Subject/Index Terms

• TRT Terms: Alternating current motors; Brushes (Electricity); Service life; Traction drives; Wear
• Subject Areas: Design; Railroads;

Filing Info

• Accession Number: 00168106
• Record Type: Publication
• Source Agency: International Union of Railways
• Files: TRIS
• Created Date: Jan 30 1978 12:00AM