| 摘要 |
The invention first of all relates to a method for generating a multi-channel measurement signal (23) for measuring the rotational speed of a rotating machine element. The multi-channel measurement signal (23) is in particular a so-called AB signal, which comprises two signal components (24, 26) which are phase-shifted by 90° and which were originally acquired by means of two offset magnetic field sensors which are opposite a magnetic multi-pole on the rotating machine element. The invention further relates to a measurement signal processing unit for generating said multi-channel measurement signal (23) and to a sensor unit which is equipped with the measurement signal processing unit according to the invention. According to the invention, a rotation angle signal (22) is first provided which represents the rotation angle of the machine element. In an additional step of the method according to the invention, the multi-channel measurement signal (23) is determined from the provided rotation angle signal (22). The multi-channel measurement signal (23) comprises at least one first channel (24) and one second channel (26). The first channel (24) and the second channel (26) each include a periodic signal which is synchronized to the rotation angle of the machine element. The periodic signal of the first channel (24) and the periodic signal of the second channel (26) have a phase shift relative to each other which preferably equals 90 degrees. According to the invention, the rotation angle signal can be provided by a plurality of magnetic field sensors, the sensors of which do not, however, have to have a phase shift of 90 degrees. |
