Variable speed DC motor
AssigneeElectric Vehicle Corporation of America
InventorJoseph A. Mas
Life of this patent
Estimating the term…
Abstract
A variable speed DC motor contained within a housing having bearing openings at each end, an armature disposed in the housing and pivoted in the bearing openings, the improvement being a first cylindrical field shell surrounding the armature and having a pair of oppositely disposed field pole segments mounted the shell and facing the armature. There is a second cylindrical field shell surrounding the armature and also having a pair of oppositely disposed field pole segments mounted facing the armature. The motor also has a gear means coupled to each of the shells for angularly displacing said first and second shells opposite to each other with respect to the neutral axis of the motor.
Claims7
A variable speed DC motor contained within a housing having bearing openings at each end, an armature disposed in the housing and pivoted in the bearing openings, the improvement comprising:
- first cylindrical field shell means surrounding the armature and having at least a pair of oppositely disposed magnetic field pole segments mounted in said shell means facing the armature;
- second cylindrical field shell means surrounding the armature and having at least a pair of oppositely disposed magnetic field pole segments mounted in said shell means facing the armature;
- means mounting to each of said shell means for independent rotation within said housing and around said armature;
- gear means coupling said shell means for rotation of the latter in opposite directions, whereby to vary the angular spacing between the magnetic field pole segments of the first shell means and the magnetic field pole segments of the second shell means;
- and control means for selectively rotating said shell means, said control means having an actuating portion located outside of said motor housing for control of said shell means exteriorly of said motor.
Dependencies are inferred from the claim text.