Device for measuring a relative rotation speed and/or a relative angular position between a first rotating element and a second rotating element mounted to rotate relative to a static part

A measuring device for measuring a relative rotation speed and/or a relative angular position between a first rotating element (2;

• 102) and a second rotating element (3;
• 103) mounted to rotate relative to a static part, the device including:
• means for generating a magnetic field rotating at a magnetic rotation speed representing a rotation speed of the first rotating element;
• a sensor (5;
• 105) mounted to rotate at the rotation speed of the first rotating element or at a rotation speed of the second rotating element and sensitive to the rotating magnetic field, the sensor being adapted to produce from the rotating magnetic field a measurement signal representing the relative rotation speed and/or the relative angular position;
• processing means (11;
• 111) positioned on the static part and intended to acquire the measurement signal;
• first transmission means adapted to transmit the measurement signal to the processing means from the sensor.