Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1975-01-02
1978-01-24
Hohauser, Herman J.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318230, 318231, 307354, H02P 540
Patent
active
040706052
ABSTRACT:
Power control apparatus and method for controlling polyphase excitation of a polyphase load. A first sequence of timong pulses are generated to represent each zero level voltage crossing of every phase voltage from a polyphase voltage source. After each of the predetermined numbers of the timing pulses has been generated, an energizng pulse is generated having a width of a predetermined duration. A set of power switches is provided coupling the polyphase source to the load via a set of load lines. The power switches are all rendered conductive to selectively couple phase voltages from the polyphase source to the load by each energizing pulse. This causes excitation of the load via repeating sequences of intermittent power pulses, with each power pulse being comprised of a selected grouping of the phase voltages from the polyphase voltage source. The source phase voltages comprising each group are associated in time with one another on the load lines and are: (1) of a selectable number, and (2) of a selectable permutation of phases. Variance of the rate at which the energizing pulses are generated and of the value of the predetermined duration of the pulse width determines the selected number of and the phase of the voltages in the power pulses. The selected number and phases of the voltages in each power pulse and the repetition rate of the power pulses determine the effective frequency at which the load is excited. In a preferred embodiment the load is a polyphase induction motor, and its speed is fractionally reduced without a great sacrifice in torque by adjusting the repetition rate and the pulse widths of the energizing pulses.
REFERENCES:
patent: 3703672 (1972-11-01), Bird et al.
Hohauser Herman J.
McNeil Corporation
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