Rotation monitoring system for a rotary-anode drive motor in X-ray tubes

摘要

The X-ray device has a monitor associated with the electric drive motor (3) for rotation of the anode (1), with a sensor circuit providing an angle signal depending on the phase angle between the motor current and a reference voltage and a comparison circuit for detecting the variation in the angle signal, used as the criteria for the motor rotation. A short-term sampling signal is supplied for providing a decrease in the frequency of the rotary anode drive motor, with storage of the angle signal before the frequency reduction for comparison with the signal obtained at a given point during the sampling frequency.