| 摘要 |
PURPOSE:To prevent previously trouble concerning to anode rotation by detecting the number of rotations of a rotating anode, and controlling electric power for starting ratation to reach a specified number of rotations, additional power to a specified number of rotations when the number of rotations is decreased, and braking power from high speed rotation to normal rotation in connection with actual number of rotations of the rotating anode. CONSTITUTION:8a, 8b are voltage dividing resistance detecting voltage across an auxiliary coil 6, and voltage corresponding to the number of rotations of a rotor, that is, the number of rotations of an anode occues across the resistance 8b. By comparing a setting voltage generator 12 corresponding to a specified number of rotations with the voltage of 8b with a comparator 13 and feeding-back the factor of the number of rotations to an anode driving section 40, starting up to normal number of rotations can be confirmed. Therefore, reduced number of rotations due to reduced power and due to generation of heat of a rotor and wear of a shaft caused by excess power can be prevented. |
