Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Slipping and/or racing control for electric motors
Patent
1979-07-26
1981-09-29
Weldon, Ulysses
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Slipping and/or racing control for electric motors
318 71, 318 81, B61C 1508
Patent
active
042925720
ABSTRACT:
A method and apparatus are described for regulating the armature currents of a plurality of electric motors connected to share the same load, but having separate power sources. The described method and apparatus thereby operate to enhance the load-sharing characteristics of these motors. Each of the motors is provided with armature currents by a separate generator set so that each motor is connected in an individual Ward-Leonard type system. The fields of each of the motors are excited separately from the aforementioned separate power sources. The armature currents for each of the motors are individually sensed, and values corresponding to the armature current values are derived. The latter analog values are compared with an average value for all of the armature currents. When a difference or error signal occurs for a given armature current value as a result of the foregoing comparison, the field excitation for the corresponding motor is regulated to produce an armature current value which will approach or be substantially the same as the aforementioned average value. By this means, each of the plurality of motors is caused to have an armature current of substantially the same value as the armature currents of the other motors driving the same load.
REFERENCES:
patent: 2930958 (1960-03-01), Schaufuss
patent: 3577048 (1971-05-01), Nordin
patent: 3611079 (1971-10-01), Ivey
patent: 3688167 (1972-08-01), Ivey et al.
patent: 3789280 (1974-01-01), Oldfield
patent: 4164872 (1979-08-01), Weigl
Dresser Industries Inc.
Lalos Peter N.
Weldon Ulysses
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