[54] APPLICATION-SPECIFIC ELECTRONIC MOTOR STARTER
[75] Inventor: Christopher H. Bock, Shorewood, Wis.
[73] Assignee: Allen-Bradley Company, LLC, Milwaukee, Wis.
[21] Appl. No.: 08/883,411 [22] Filed: Jun. 26, 1997
[51] Int. C I. H02P 1/46
[52] U.S. CI 318/716; 318/723; 318/807
[58] Field of Search 318/727, 434,
318/712, 719, 723, 778, 780, 779, 798, 800-803, 807-812, 700, 705-707, 551, 716; 187/103, 119, 104; 361/29
[56] References Cited
U.S. PATENT DOCUMENTS
4,042,965 8/1977 Wisman 361/29
4,220,902 9/1980 Aronsson et al 318/434
4,449,082 5/1984 Webster 318/271
4,616,166 10/1986 Cooper et al 318/712
4,721,188 1/1988 Araki et al 187/296
5,027,049 6/1991 Pratt et al 318/807
5,196,656 3/1993 Mizuno et al 187/314
5,271,346 12/1993 Mori 112/220
5,296,791 3/1994 Hipp 318/563
5,387,855 2/1995 Miyazaki et al 318/805
5,402,054 3/1995 Eckersley 318/801
5,625,262 4/1997 Lapota 318/71
5,705,904 1/1998 Kuriyama 318/439
5,764,022 6/1998 Kazama et al 318/801
Primary Examiner—Brian Sircus
Attorney, Agent, or Firm—-Joseph N. Ziebert; John J. Horn; A.M. Gerasimow
[57] ABSTRACT
A motor control system or electronic motor starter is optimized to replace electromechanical motor starters. Heat dissipation requirements are reduced by utilizing a by-pass contactor when the motor is in a run mode. The electronic motor starter derives power from an AC motor control signal conventionally utilized to power the coritactor coil associated with a conventional electromechanical starter.
20 Claims, 8 Drawing Sheets
