Title:
MOTOR CONTROL APPARATUS FOR A RAILWAY SWITCH MACHINE
Document Type and Number:
WIPO Patent Application WO2001054263
Kind Code:
A8
Abstract:
A motor control apparatus (104) for a railway switch machine (106) includes a power source (134) for a voltage; a selector (132) for providing the voltage to a reversible motor (105) of the switch machine (106) in a normal state, and for providing a reverse polarity of the voltage to the reversible motor (105) in a reverse state; a first transistor (129) for switching reverse current flowing through the reversible motor (105); a first diode (131) electrically connected in parallel with the first transistor (129) for conducting normal current for the reversible motor (105); a second transistor (128) for switching normal current flowing through the reversible motor (105); a second diode (130) electrically connected in parallel with the second transistor (128) for conducting reverse current for the reversible motor (105); and a circuit (118) for controlling the first and second transistors based upon the position or operating mode of the railway switch machine (106).
Inventors:
FRANKE RAYMOND C
BOZIO ROBERT P
WYDOTIS LEONARD M
BOZIO ROBERT P
WYDOTIS LEONARD M
Application Number:
PCT/US2001/002157
Publication Date:
November 29, 2001
Filing Date:
January 23, 2001
Export Citation:
Assignee:
UNION SWITCH & SIGNAL INC (US)
International Classes:
B61L5/10; H02P7/00; (IPC1-7): H02P3/12; H02P3/14; H02P3/18
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