US PATENT SUBCLASS 318 / 81
.~.~.~ Field secondary circuit control
Current as of:
June, 1999
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318 /
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ELECTRICITY: MOTIVE POWER SYSTEMS
34
DF
PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS
{22}
66
DF
.~ Running-speed control {4}
68
DF
.~.~ Relative motor speed control {5}
81
.~.~.~ Field secondary circuit control
DEFINITION
Classification: 318/81
(under subclass 68) Subject matter in which means are provided for controlling the field or secondary circuit of one or more of the motors.
SEE OR SEARCH THIS CLASS, SUBCLASS:
79, for this subject matter where the system includes field or secondary circuit control in combination with armature or primary circuit control.
84, for plural motor systems having field or secondary circuit control for controlling the (group) speed of a plurality of electric motors.
97, for plural motor systems having field circuit control for acceleration and/or deceleration control of the motors.
521+, and the subclasses specified in the search notes thereto, for motor systems having field circuit control means.
