| 摘要 |
A device for providing a voltage indicating the angular velocity of rotation of the armature in a limited rotation, polarized, moving iron galvanometer. The device includes a means for providing a first voltage dependent upon the angular velocity of the armature, the self-inductance of the galvanometer drive coil, and the drive current in the drive coil. A compensation coil is magnetically coupled to the drive coil and magnetically isolated from the effects of the rotating armature to provide a second voltage which is dependent upon mutual inductance between the drive and compensation coils and upon the drive current, but is not dependent upon the effects of the rotating armature due to the magnetic isolation of the compensation coil from the armature. A combining means proportionally combines the first and second voltages to provide a voltage indicating the angular velocity of rotation of the armature. The means for providing the first voltage includes either the drive coil, with the first voltage appearing across the drive coil, or a pickoff coil wound coaxially with and adjacent to the drive coil so that the first voltage appears across the pickoff coil and is proportional to the voltage appearing across the drive coil. The velocity signal thus derived is introduced to the drive circuit to provide effective damping.
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