An angle-to-current converter for generating an electrical current output in direct proportion to the degree of angular displacement of an input shaft. The converter includes a differential-inductance transducer constituted by a variable reluctance disc mounted on the input shaft, the profiled edge of the disc passing through diametrically-opposed air gaps defined by the cores of a pair of inductors. The profile of the disc edge is so contoured that as the disc rotates, the region of the edge lying within one gap increases while that lying within the other gap decreases, thereby varying the inductance ratio of the pair as a function of input angle. The transducer inductors are connected to the input of an astable multivibrator in a transmitter wherein the multivibrator generates a square wave whose duty cycle is varied in accordance with the varying inductance ratio and the square wave is integrated to produce a voltage whose magnitude is proportional to the input angle. This voltage is converted into a corresponding output current.
A rotational displacement sensor includes a pair of coils stationarily mounted adjacent a rotatable cam formed of a metallic material. The coils are energized by high frequency alternating current. A differential amplifier is connected to the coils such that the output of the amplifier is linearly proportional to the rotational angular displacement of the cam relative to the coils.
A fluid flow meter is disclosed which can generate both an electrical and a mechanical representation of flow rate. A first magnet, mounted within a flow tube, is displaced in response to fluid flow in the flow tube. A second magnet, mounted outside the flow tube, moves in response to changes in the magnetic coupling between the first magnet and the second magnet caused by displacement of the first magnet within the flow tube. A pointer is coupled to the second magnet and moves with the second magnet to produce a visual representation of flow rate. A sensor, mounted in proximity to the second magnet, and responsive to movement of the second magnet, produces an electrical signal representative of the flow rate.
Monitoring and signaling device having at least one tape for indicating a measurement value of a measuring unit and for actuating a signal transmitter, the tape having a section thereof stretched over spatially separated guides and having a travel proportional to the measurement value and a coating effecting actuation of the signal transmitter which is displaceable parallel to the section of the tape extending between the guides, including an indicator for indicating a set nominal-value signaling point, the indicator and the signal transmitter being integrated in a signal head, and two bars extending parallel to the section of the tape and carrying the signal head, the section of the tape being displaceable past the signal transmitter in direct vicinity thereof and between the signal transmitter and the indicator.
An electric motor comprising a stator block or assembly having stator windings and a control circuit substrate for supplying driving current thereto mounted integrally with the stator block, a shaft rotatably journalled in said stator block, a magnet casing in which are mounted driving magnets associated with the shaft, a rotor block or assembly provided with detector magnets held at an end of the shaft, and a detector winding block or assembly mounted within a motor housing to which a bracket is fixed. There is also disclosed a control means for controlling the driving current for the driving windings in response to the voltage induced in the detector winding block.
Apparatus and method for detecting rotation of a shaft include a first antenna for transmitting electromagnetic energy into the shaft, a second antenna disposed for rotation with the shaft for modulating electromagnetic energy passing through the shaft in relation to the shaft rotational speed, and a detector for detecting the modulated electromagnetic energy that passes through the shaft.
