Device for determining the rotary angle position of rotary drives of electrical machines by evaluation of electrical voltages by sensors responding to rotary movements

Abstract

A device for determining the rotary-angle position of rotary drives which can also determine the rotary speed. A magnet rotor generating a rotating magnetic field is provided for the purpose of determining the rotary speed with a cam disc suited for screening magnetic field lines, and to arrange coacting inductive transmitter and receiver heads on both sides of the cam disc, for determining the rotary-angle position. Due to the fact that the electromagnetic radiation emitted by the transmitter head is screened, the output signal of the receiver heads obtained is an envelope-modulated signal which can be evaluated for determining the position, for example by phase comparisons with additional envelope-modulated output signals of other receiver heads. The axial magnetization lines emanating simultaneously from the magnet rotor serve for inducing electric voltages in flat coils arranged axially before the magnet rotor, in overlapping annular shape.

Dependencies are inferred from the claim text.