| 摘要 |
<p>The invention relates to a process for generating a voltage (uDK) proportional to a rotation speed with a resolver (2) from the outputs of which may be taken two travel or angle-dependent, amplitude modulated sine-wave voltages (S1, S2) electrically phase shifted by 90°, the amplitude of which is modulatable in accordance with the position of the rotor or the angle of rotation (α). The invention also relates to a circuit for implementing the process. According to the invention, a sine-wave amplitude signal (RL1, RL2) dependent on the position of the rotor or the angle of rotation (α) is obtained from the two amplitude modulated sine-wave signals (S1, S2), these sine-wave amplitude signals (RL1, RL2) are transformed into an approximate sine-wave signal (RL1A, RL2A) which is linear in a range of ± 45° around the zero transition, this approximate sine-wave signal (RL1A, RL2A) is differentiated and finally inverted and an analogue voltage (uDK) proportional to the rotation speed is composed depending on a detected rotor position (α) from the two differentiated signals (R'L1A, R'L2A) and the two inverted differentiated signals (R^¨B7'L1A, R^¨B7'L2A). This provides an economical process for detecting low rotation speeds which are measured by means of a resolver (2).</p> |
