FERMI CHOPPER ROTATION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a Fermi chopper rotation control device improving a rotary speed and the precision of the rotary speed, and reducing a current spike noise.

SOLUTION: A Fermi chopper 1 for monochromating neutron beam generated at a pulsed neutron source includes: a three-phase signal generating unit 4 that generates a three-phase sinusoidal signal from a digital phase signal for supplying respective phase coils of an induction motor 12 therewith; a three-phase power amplifier 6; and a motor control unit 5. The motor control unit 5 outputs a phase signal corresponding to a target rotary speed of a rotor 11 to the three-phase signal generating unit 4, and performs a speed control for controlling the rotary speed of the induction motor 12 based on the rotary speed of the rotor 11 detected by a rotation sensor 14, and a phase control for controlling the phase of the induction motor 12 based on a reference timing signal input from the outside and the rotary position of the rotor 11 detected by the rotation sensor 14.

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