MULTI-ARMATURE AND CONCENTRIC MOTORS

摘要

Electric motors of multi-armature and concentric design having high efficiency and special operating characteristics adapting the motors for a number of different types of applications. The multi-armature design employs two or more armatures and a common source of magnetic excitation, parallel magnetic circuits being established through the armatures to independently excite the same. In the two armature version, parallel connection of the armatures and the excitation winding causes the motor to have a dual operating characteristic in that the speed of one armature varies inversely with the speed of the other armature, and vice versa, until the higher speed armature reaches a critical rpm, whereupon the load may be increased over a wide range without further changes in the speed of either armature.