Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Running-speed control
Patent
1992-12-17
1995-04-18
Ro, Bentsu
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Running-speed control
318 71, H02P 7685
Patent
active
054081645
ABSTRACT:
The invention relates to apparatus for controlling a plurality of electric motors. The apparatus includes drive means for applying electrical power to the motors at a predetermined current or voltage. Sensor means are provided for sensing the load on each motor. Comparator means, which include polarity detection means for generating at least one polarity signal representative of the combined polarity of the loads, and summing means for deriving a magnitude signal representative of the loads, are used to determine the relative magnitudes of the loads. Control means are arranged to generate a compensation signal which is applied to the drive means to reduce the power applied to the more heavily loaded motor or motors. The control means typically includes switching means responsive to the polarity detection means for determining the polarity of the magnitude signal, thereby to obtain the compensation signal. The invention extends to a method of controlling a plurality of electric motors.
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Eimco Mining Machinery (Proprietary) Ltd.
Ro Bentsu
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