Control system for a wound-rotor motor

Patent · Sat Jan 01 00:00:00 EST 1983

OSTI ID:864582

Ellis, James N ^[1]

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1. Chatsworth, CA

A load switching circuit for switching two or more transformer taps under load carrying conditions includes first and second parallel connected bridge rectifier circuits which control the selective connection of a direct current load to taps of a transformer. The first bridge circuit is normally conducting so that the load is connected to a first tap through the first bridge circuit. To transfer the load to the second tap, a switch is operable to connect the second bridge circuit to a second tap, and when the second bridge circuit begins to conduct, the first bridge circuit ceases conduction because the potential at the second tap is higher than the potential at the first tap, and the load is thus connected to the second tap through the second bridge circuit. The load switching circuit is applicable in a motor speed controller for a wound-rotor motor for effecting tap switching as a function of motor speed while providing a stepless motor speed control characteristic.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4388579
• OSTI ID: 864582
• Country of Publication: United States
• Language: English

Related Subjects

control
wound-rotor
motor
load
switching
circuit
transformer
taps
carrying
conditions
parallel
connected
bridge
rectifier
circuits
selective
connection
direct
current
normally
conducting
tap
transfer
switch
operable
connect
begins
conduct
ceases
conduction
potential
applicable
speed
controller
effecting
function
providing
stepless
characteristic
speed control
direct current
bridge circuit
switching circuit
motor speed
parallel connected
rectifier circuit
current load
speed controller
load switch
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