Electric power converter with load compensation
OwnerJohn W. Luceinventor
Life of this patent
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Abstract
Electric power converter with load compensation, especially for electrical loads subject to fluctuations in demand for power, such as arc furnaces, welders, etc. An external source of electrical power is applied to a stationary input winding of the converter to produce a movable polyphase magnetic field coupled to an output winding movable at least in part over a limited range relative to the input winding. The movement is resisted by an interposed resilient member adapted to position the output winding to match the output to the input power demand of the load equipment thereby counteracting whatever fluctuations tend to occur in load resistance and current.
Claims21
An electric power converter in cylindrical form, comprising
- a ferromagnetic axial rotor and a ferromagnetic coaxial stator, the rotor being rotatable relative to the stator through an angle limited to at most about a half circle of arc;
- resilient means interconnecting the stator and the rotor, and so adapted to resist rotor rotation relative to the stator;
- a multi-phase power input winding on the stator, adapted to produce a polyphase rotating magnetic field when energized;
- and
- a multi-phase electrical power output winding subdivided by being wound in part on the stator and in part on the rotor, and magnetically coupled to the power input winding on the rotor.
An electric power converter in linear form, comprising
- a ferromagnetic fixed bed and a ferromagnetic adjacent cover movable through a limited distance in a given translatory direction of displacement relative to the bed;
- resilient means connected to the cover and resisting such displacement of the cover relative to the bed;
- a multi-phase power input winding on the bed, producing a polyphase translatory magnetic field when energized;
- and
- a multi-phase electrical power output winding subdivided by being so wound in part on the bed and in part on the cover, and magnetically coupled to the input winding on the bed.
Electric power converter apparatus with output connectable to an electrical load, whose required power varies with its current, so as to compensate for variation in that load current, comprising
- a stator carrying a multi-phase electrical power input winding producing a polyphase moving magnetic field when energized;
- a member capable of at most only limited movement relative to the stator and carrying the major part of a multi-phase electrical power output winding magnetically coupled to the input winding;
- and
- resilient means, interconnecting the stator and the member of limited movement relative thereto, limiting such movement to match the converter output to the load requirement.
An electric power converter
- comprising a input winding in a substantially fixed position, and an output winding, magnetically coupled to the input winding and movable in substantial part relative to the input winding;
- producing, when energized, a polyphase moving magnetic field in the input winding and thus to induce relative movement of the magnetically coupled output winding;
- and
- resilient means interposed between the relatively fixed input winding and the relatively movable substantial part of the output winding and thereby resisting the relative movement.
Electric power control apparatus responsive to fluctuation in power demand of variable electrical loads, as in electric arc furnaces, and enabled to compensate for fluctuations in electric power demand, comprising
- an electrical converter having an output winding and having also an input winding powered from an external multi-phase electrical source and producing a polyphase moving magnetic field when the input winding is so powered;
- the output winding being subdivided into parts, including a part fixed relative to the input winding and a part movable relative to the input winding and relative to the fixed part of the output winding;
- means magnetically coupling the moving magnetic field in the input winding to the output winding and thereby forcing the movable part of the output winding to move through a limited range relative to the input winding and relative to the fixed part of the output winding;
- electrically conductive means interconnecting the output winding to an electrical load having a variable demand for electrical power when the converter is so powered;
- and
- resilient means interconnecting the fixed part and the movable part of the output winding non-electrically, opposing their relative movement.
Dependencies are inferred from the claim text.