Transmitter system for a ferraris motion transmitter
View Patent ↗A highly simply technical transmitter system for a Ferraris movement transmitter, wherein several magnetic field generators (M 1 ,M 2 ,M 3 ) 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 (W 1 ,W 2 ,W 3 ) is provided as a measuring body.
1. A transmitter system for a Ferraris motion transmitter, comprising:
an electrically conducting, rotating device shaft; and
at least one magnetic measurement assembly which comprises an arcuate support structure segment which only partially encompasses the device shaft with an angle of less than 180° and which includes two outer magnetic field generators and a center magnetic field generator being arranged on the support structure between the two outer magnetic field generators; and
two magnetic field sensors which generate an output signal that depends on the rotation speed or rotation acceleration of the rotating device shaft, with one of the two magnetic field sensors located on the support structure between one of the outer magnetic field generators and the center magnetic field generator and the other magnetic field sensor located on the support structure between the other outer magnetic field generator and the center magnetic field sensor, said magnetic field generators and said sensors oriented towards the rotating device shaft and having predetermined air gap spacings from the rotating device shaft.
2. The transmitter system of claim 1 , wherein the device shaft comprises a hollow shaft.
3. The transmitter system of claim 1 , wherein the device shaft comprises a multi-element shaft.
4. The transmitter system of claim 1 , wherein the device shaft comprises a shaft of an electric motor.
5. The transmitter system of claim 1 , wherein at least one of the outer and center magnetic field generators comprises a permanent magnet and that the magnetic field sensors comprise anti-serially connected coils.
6. The transmitter system of claim 1 , wherein the magnetic field generators comprise permanent magnets and the magnetic field sensors comprise Hall sensors.
7. The transmitter system of claim 1 , wherein the magnetic field generators comprise electromagnets that are controllably modulated and the magnetic field sensors comprise anti-serially connected coils.
8. The transmitter system of claim 1 , wherein the device shaft is rotatably supported by a bearing and the at least one magnetic measurement assembly is fixedly connected with the bearing.
9. The transmitter system of claim 1 , wherein the center magnetic field generator is installed on the support structure segment so that the magnetic pole of the center magnetic field generator facing the rotating device shaft is of opposite polarity with respect to the magnetic poles of the outer magnetic field generators facing the rotating device shaft.