A transducer to monitor velocity and direction of movement having a magnetic core with at least three spaced apart poles. Two of the poles include coils which are wired series aiding for connection to an input alternating voltage, which upon current flow create a magnetic field intersecting the path of movement of an object being monitored. The third pole includes a coil in which an alternating output voltage is induced when the monitored object moves. The magnitude of such output voltage varies with the rate of speed of the monitored object. The phase relationship of output voltage to input voltage varies with the direction in which the monitored object moves. The coil in the third pole is connected to responsive means to receive the output signal and control, or indicate, the speed as well as the direction of movement of the monitored object.
This is a continuation of application Ser. No. 613,827, filed Sept. 16, 1975, now abandoned which in turn is a continuation of Ser. No. 471,411, filed May 20, 1974 now abandoned.
A Ferraris sensor for measuring an acceleration of a moving body along a direction. The sensor includes a flat eddy current body and a scanning head arranged on one side of the eddy current body. The scanning head includes N magnets that generate an external magnetic field that extends approximately perpendicular to a surface of the eddy current body, wherein N=1, 2, 3, . . . and M detector coils, wherein M=1, 2, 3, 4, . . . and each detector coil includes an axis and detects changes of an interior magnetic field within the N magnets that are caused by an acceleration of the eddy current body and a resulting change in eddy currents. The axis is approximately perpendicular with respect to the surface of the eddy current body, each detector coil lacks a ferromagnetic core and the N magnets and the M detector coils are arranged alternatingly next to each other in a direction that the acceleration is to be measured.
A highly simply technical transmitter system for a Ferraris movement transmitter, wherein several magnetic field generators (M1,M2,M3) form at least one magnetic circuit with a moveable, non-magnetic electrically conducting rotating measuring body and speed-dependent or acceleration-dependent output signals can be generated by means of magnetic field sensors coupled thereto, embodied in such a way that a preferably cylindrical device shaft (W1,W2,W3) is provided as a measuring body.
A rotary motion detector includes an electrically conducting induction element formed essentially as a hollow cylinder and rotatable about a rotation axis. An excitation assembly applies an inhomogeneous magnetic field and induces an eddy current in the induction element, when the induction element rotates about the rotation axis. A sensor assembly detects a measurement signal that depends on the eddy current. The excitation assembly and the sensor assembly are both arranged radially inside the induction element.
Transducer, in particular clockwork driving motor, comprising a stator (2) formed of two stator parts (16 and 26) and three cores (18, 19, 20) connecting respectively three magnetic poles (28, 29, 30), defined by the first stator part (16), to the second stator part (26) used to close the magnetic paths of the transducer. The coils (22 and 24) are used to supply the transducer to drive in rotation respectively the two rotors (4 and 6). The coil (23) is connected to detection means (72) used for detecting the rotation of one or other of the two rotors (4 and 6), and in particular, for detecting zero crossing of the induced voltage (or similarly of the induced current) in the coil (23). Detection of zero crossing of the induced voltage is used to provide input signals to the supply means (70) to control driving of the rotors (4 and 6) in an efficient and reliable manner, in particular in a rapid or continuous operating mode, whether in a forward or backward rotational direction.
