Electricity: motive power systems – Induction motor systems – Secondary circuit control
Patent
1996-02-28
1998-05-26
Masih, Karen
Electricity: motive power systems
Induction motor systems
Secondary circuit control
318798, 318815, 318776, 318729, 318531, H02P 134
Patent
active
057571627
ABSTRACT:
An alternating current induction motor having a multitapped RUN winding and including a controller which automatically determines an instant tap selection in response to changes in applied a.c. electric power voltage level appearing immediately at the motor terminals. A measure of instant level of the motor terminal voltage is utilized to automatically reselect the RUN winding tap selection in order to maintain a near constant level of magnetic excitation in the stator field irrespective of immediate changes or variations in the available motor terminal voltage. Electric lawn mowers, power tool motors and other heavily loaded motors which may normally be operated at the end of various lengths of especially long and lossy extension cords or the like may advantageously utilize my control technique to maintain operation with an about normal and constant level of power, independent from usual performance degrading voltage drop losses commonly encountered in the extension cord. Appliances which use induction motors, such as air conditioners and refrigerators, may run with better electrical efficiency in presence of poor line voltage regulation due to inadequate wiring, or intentional brown-out conditions, while maintaining nearly constant operational performance.
REFERENCES:
patent: 5041775 (1991-08-01), Erdman
patent: 5159255 (1992-10-01), Weber
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