Appeal 2006-1324
Application 09/882,127
determining rotor position, but the inventors also discuss external position
sensors for determining rotor position. One class of position sensors
mentioned are magneto-electronic position sensors, and a list of such
position sensors is given. We note that the list contains both Hall effect
sensors and Wiegand effect sensors. Otherwise, Wiegand effect sensors are
not mentioned in the patent.
Hinke discloses an invention that increases the output amplitude
obtained from a Wiegand wire transducer. A Wiegand wire (1) is
surrounded by a pick-up coil (2). Surrounding the pick-up coil but insulated
therefrom by insulator (10) is a ferrite or soft core iron element (3). Use of
the ferrite element (3) increases the transducer output substantially so that
the output pulses can be distinguished from background noise.
Normann includes a good description of the magnetic and electric
properties of Wiegand wires. The invention in Normann is directed to
ganging Wiegand wires in parallel for a larger magnetic pulse. In the figure,
Wiegand wires 1, 2, 3 are surrounded by coils 4, 5, 6 and their output is in
parallel to trigger an optical circuit.
The Wiegand patent is another disclosure of the magnetic switching
device which has come to be known as a Wiegand effect or Wiegand wire.
The patent discloses that a preferred material for manufacturing a Wiegand
wire is an alloy of iron, cobalt and vanadium.
Yeoman discloses a problematic device said to be able to generate
hydrogen from the electrolysis of water. Yeoman discloses that the common
material for the coil winding around the Wiegand wire is copper.
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