Tachometer noise reduction system using a pickup coil to cancel

Details Tachometer noise reduction system using a pickup coil to cancel Tachometer noise reduction system using a pickup coil to cancel

1989-08-21

1991-09-03

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed analog electrical signal generator

310 68R, 310155, 310168, 318638, G01P 346, G01P 352

Patent

active

050457845

ABSTRACT:
A current carrying drive coil in a magnetic field is moved by the field. An attached tachometer coil, passing through the same field, produces a voltage from which the speed of the coils may be calculated. Changes in the drive coil current produce noise in the tachometer coil. This noise is offset by combining the tachometer voltage with the voltage produced by a stationary pickup coil, which picks up only the noise.

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