Control system for a wound-rotor motor

Patent · Fri Jul 17 04:00:00 EDT 1981

OSTI ID:5224275

Ellis, J. N.

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 characteristics.

• DOE Contract Number: W-31109-ENG-38
• Assignee: Dept. of Energy
• Patent Number(s): None
• Application Number: ON: DE82013589
• OSTI ID: 5224275
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
CONTROL EQUIPMENT
DESIGN
ELECTRIC MOTORS
ELECTRONIC CIRCUITS
EQUIPMENT
MOTORS
SPEED REGULATORS
SWITCHING CIRCUITS