Angle stepping transmitter

Abstract

Abstract 1,237,756. Measuring speed electrically. HASLER A.G. Oct. 31, 1968 [Nov. 7, 1967], No. 51762/68 Heading G1N. The speed of a rotating shaft is measured with a transmitter 1 including a toothed member 7 of electrically conductive material removably mounted on a shaft 3 which is coupled either mechanically or magnetically to the shaft whose rotary speed is to be measured, the teeth of which member 7 pass through a slot in at least one block 9 containing a high-frequency generator circuit. The generator components are mounted on a printed circuit 12, 14, 15 and include two coils 19 adjustably mounted in coaxial bores 18 in a U-shaped support 13, the teeth of member 7 passing through the slot 16 in the support 13. The coils 19 are connected in a feedback circuit of the generator and the teeth cause oscillations of the generator to be intermittantly interrupted, the resultant waveform being rectified and converted to squarewave pulses which are measured Fig. 3 (not shown). As shown in Fig. 1 two generators 9 are provided, their coils being offset relative to each other by an odd multiple of a quarter tooth pitch and their outputs being connected to a logic circuit to indicate the direction of rotation. The output of the generator may be connected to a temperature dependent resistance so that the effective load resistance diminishes with an increase in temperature.

Inventors

No inventors recorded.

Bibliographic Details