[IEEE 7th International Scientific and Practical Conference of Students, Post-graduates and Young Scientist. Modern Techniques and Technology. MTT'2001 - Tomsk, Russia (26 Feb.-2 March 2001)] Proceedings of the 7th International Scientific and Practical Conference of Students, Post-graduates and Young Scientists. Modern Techniques and Technology. MTT'2001 (Cat. No.01EX412) - Increasing of commutation stability of low power collector electrical machines