Electricity: motive power systems – Induction motor systems – With voltage source connected to motor secondary
Patent
1981-07-17
1983-06-14
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
With voltage source connected to motor secondary
318822, 318828, 323343, H02P 540
Patent
active
043885799
ABSTRACT:
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.
REFERENCES:
patent: 3426260 (1969-02-01), Lee et al.
Murphy, J. M. D., Thyristor Control of AC Motors, 1973, pp. 54-55.
Paice, D. A., "Speed Control of Large Induction Motors by Thyristor Converters", IEEE Trans. on Ind. and General Applications, vol. IGA-5, No. 5, Sep./Oct. 1969.
Smith Jr. David
The United States of America as represented by the United States
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