Neutron Velocity Selector Controllers

Multidisc Neutron Velocity Selector Controller
NFA-06.05

The microprocessor-based control electronic consists of a rotation speed controller connected to a safety-monitoring unit.
The main tasks of the control electronics:

  • The rotation speed is controlled with an accuracy better than ± 2 rpm;
  • A current limit is imposed to keep the motor torque below 1 Nm in order not to ensure the coupling between the two magnet rings (the breakdown torque is ~2.5 Nm);
  • The vacuum level is controlled and digitally displayed;
  • The temperature of the bearings of both sides of the rotor are measured and displayed;
  • The noise of the bearings of both sides of the rotor are measured and the trip situation displayed;
  • Two independent revolution sensors mounted on the motor and selector-rotor side (it works when the coupling is broken) provide motor-rotor phase checking. The selector-rotor side revolution sensor also gives input signal for the rotation speed limiter.

Several safety functions are considered to prevent failures in operation or damage to the selector. In case of emergency, i.e. failure of any function of the selector the monitor stages switch off the driving motor in order to stop the rotor.
The measuring channels belonging to selector controller are as follows:

  • Rotation control and magnetic shaft coupling monitor channel
  • Bearings temperature measuring channels (2)
  • Bearing noise monitor channels (2)
  • Vacuum meter channel
  • Power supply
  • Limit value monitor and shut down stage

Details

Multidisc Neutron Velocity Selector Controller
NFA-06.11

The NFA-06.11 control electronics is divided in three parts

  • Selector Controller
  • Motor, sensors, interface unit built in the selector body
  • Motor, angle encoder, interface unit built in the positioning stand

Several safety functions are considered to prevent failures in operation or damage to the selector. In case of emergency, i.e. failure of any function of the selector the monitor stages disables the Motor Driver Unit in order to stop the rotation.
The measuring channels belonging to selector controller are as follows:

  • Control of the rotation speed with accuracy better than ± 2 rpm (by implementation of two independent revolution sensors mounted on both sides of the rotor)
  • Bearings temperature measuring channels (on both sides of the rotor)
  • Bearing noise and vibration monitor channels (on both sides of the rotor)
  • Vacuum level channel

Details