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US 4,150,314 AGranted
Level amplitude output rotary speed transducer
AssigneeRobert Bosch GmbH
InventorsErich Zabler, Peter Hauler
Life of this patent
Estimating the term…
Abstract
A Wiegand wire forms part of a stator coil facing a rotor on which permanent magnets are located. The stator coil has two coil portions or coil sections which are wound or connected to provide opposing inductive outputs upon passage of the magnets in front of the coils to cancel each other, the Wiegand wire change of magnetization providing the additional read-out output, the amplitude of which will be independent of speed, but the recurrence rate will depend upon speed of the magnets passing the stator of transducer.
Claims10
Pulse transducer to transduce a shaft speed into a series of electrical pulses, comprising
- a rotor (1) having a plurality of magnets (2) located thereon of alternate polarity;
- a stator including at least one coil (4)
- and comprising, in accordance with the invention, a Wiegand wire (5) surrounded by at least a portion of said coil (4), said coil having another portion not responsive to change of magnetic domain of the Wiegand wire upon passage of the magnets (2) of the rotor with respect thereto, said portions of the coil being so connected that the voltages induced in the coils due to passage of said magnets (2) of the rotor (1) oppose and essentially cancel each other.
Dependencies are inferred from the claim text.