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The Cryo Rotary Motor (CRM) is a rotational drive with high torque output. An optical encoder can be fitted for closed loop control. In contrast to typical resistive based encoders it has no blind spots and can measure over 360 angular degrees. The moving parts are made out of nonmagnetic phosphor bronze to minimize interaction with external magnetic fields.
|Type of motion||-||Rotational|
|Coarse/scanning actuator *||-||Piezo ceramic|
|Speed @ 293 K||rev/min||5|
|Speed @ 4 K||rev/min||1|
|Coarse step size @ 293 K||mrad (deg)||0.15 - 0.75 (0.008 - 0.04)|
|Coarse step size @ 4 K||mrad (deg)||0.1 - 0.25 (0.005 - 0.015)|
|Scan Range @ 293K||mrad (deg)||0.6 (0.034)|
|Scan Range @ 4K||mrad (deg)||0.15 ( 0.009)|
|Scanner sensitivity @ 293 K **||mrad/V (deg/V)||0.005 (0.0003)|
|Scanner sensitivity @ 4 K **||mrad/V (deg/V)||0.001 (0.00006)|
|Operating temperature||K||0.02 - 375|
|Main construction material||-||Stainless steel, phosphor bronze|
|Dissipation @ 293K||mJ/step||0.59|
|Dissipation @ 4K||mJ/step||0.055|
|Controller/driver||-||CAB-230(115), CADM(2), MCM|
|* Coarse/scan positioning is both done with the CADM(2), not simultaneously|
|** 0-150V, 10 bits resolution, setpoint rate approx. 10Hz|
The COE (Cryo Optical Encoder) is a fiber based optical encoder that can be added to selected positioners for position feedback. It works by illuminating a grid and detecting high/low intensity transitions from features in the grid. Resolution is determined by the pitch of these features. It is an incremental encoder, which means that it will reset to “zero” at a power shutdown. The COE requires the OEM electronics module as light source and position readout. More info can be found in the Downloads section.
HV rated positioners can realistically be considered compatible with pressures as low as 1E-8 mbar. Lower pressures can be achieved by prolonged baking of positioners in vacuum at 100-150 deg C, depending on the type of positioner. Upon request JPE can provide such service at additional costs.
CRM1 /HV: Cryo Rotary Motor 1
CRM1-COE /HV: Cryo Rotary Motor 1-Cryo Optical Encoder