Apparatus for measuring the frequency of a pulse-generator and n
Apparatus for removing torque ripples in a direct current motor
Apparatus for removing torque ripples in direct-current motors
Apparatus for reproducing disc record
Apparatus for synchronization of a motor
Apparatus for varying the speed of DC motors
Arrangement and method for operating a magnetically suspended, e
Arrangement for controlling the speed of a DC motor
Arrangement for controlling the speed of a motor
Automatic field control for direct current shunt motor
Automatic gain control apparatus for a motor servo system