absolute encoders and motors for -80 C
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1 absolute encoders and motors for -80 C
2 motors Choosing a drive system for our application. To be taken into account: speed mechanical load characteristics smoothness of motion resolution temperature other environmental conditions our choose for IRAIT telescope: stepper motors a stepper motor is an electromagnetic driving system that moves around a particular reproduceable step angle due to defined wiring and triggering of windings (phases). With a motor control that triggers the phases, a quasi-continuous rotation is achieved. The smallest possible resolution of positioning depends on the motor as well as on the type of drive. An usual value for the resolution of commercial stepper motors is 200 steps per revolution; however, resolution can be considerably increased by electronic micro-stepping. With the right design of bearings and windings, a stepper motor is able to work in extreme environmental conditions.
3 motors stepper motors advantages for our application: high torque at low speeds, e.g. during tracking smoothness of motion, at least using good driving electronics low temperatures tolerant, choosing the right commercial product no need for an encoder to get reproduceable positioning (*) (*) but a loss of steps must be avoided! Typically a bad design and/or a bad tuning of the driving system, in presence of irregular loads, can produce a loss of steps. Anyway, as you will see, we have ALSO absolute encoders on telescope axes... our choose: PHYTRON stepper motors, model ZSH87/ PLE80/1 3:1
4 motors PHYTRON ZSH87/ PLE80/1 3:1 2 Phase Stepper Motor integral gearbox (3:1 ratio) for -30 C/+8 0 C 5A per phase 5.4 Nm holding torque (before the gearbox)
5 motors PHYTRON ZSH87/ PLE80/1 3:1 2 Phase Stepper Motors integral planetary gearbox (3:1 ratio) for -30 C/+8 0 C bipolar current per phase: 5A holding torque: 5.4 Nm max. permissible output torque: 40 Nm torsional backlash: <15 number of magnets: 3 permissible bearing axial load: 180N permissible bearing radial load: 280N 200 steps, 1.8 step angle insulation class: F Phytron is well known for its catalogue of in-vacuum and cryo stepper motors frequency behaviour (control pulses) for two supply voltage values
6 motors our choose for driver electronics: PHYTRON SLS-4xPAB axis Rack Mount Power Drive including 4 power stages PAB VAC power supply supplier in Italy: MICOS Italia Gmbh power stage PAB micro 256
7 motors Climatic chamber tests (from 0 C to -80 C) in Germany (Phytron) Tested system behaviour in working conditions at various temperature values. Tested speed constance and motion smoothness and resolution at low temperatures, especially for low speeds (tracking). The system has been calibrated at -30 C. It works without problem at this temperature; with lower temperatures, there will be no damage. Giving power supply to the motors leads their temperature over -30 C; at that point we can move the telescope. A derating has been applied, to take into account the effect of low pressure values. We are using commercial off-the-shelf products; the cost-benefits ratio is very good.
8 motors IRAIT drive groups mechanical configuration redundancy and backlash reduction 2x motors (primary and bk) 2x 90 1:1 gearboxes 2x 1:20 gearboxes 2x pinions
9 motors IRAIT azimut drive group 2x motors 2x 90 1:1 gearboxes 2x 1:20 gearboxes 2x pinions 1x slewing bearing
10 motors IRAIT azimut drive group
11 motors IRAIT elevation drive group 2x motors 2x 90 1:1 gearboxes 2x 1:20 gearboxes 2x pinions 1x gear sector
12 motors IRAIT elevation drive group
13 motors mounting/dismounting operations...
14 motors special grease... High degree of STABILITY; unmatched chemical and solvent resistance; thermal and oxidative stability; excellent radiation stability. COMPATIBILITY with a broad selection of materials inert to most plastics, metals, and elastomers, liquid and gaseous oxygen. SAFE; non-flammable, non-toxic, no volatile organic compounds, NSF certified, BAM approved. Broadest operating TEMPERATURE range of all classes of lubricants (- 90 C to 290 C).
15 absolute encoders Choosing a position feedback system for our application. We don t have encoders on motor axes; we use an angular position readout directly on telescope axes, at the end of kinematic chain (1:1440 total ratio). To be taken into account: resolution and repeatability of angular measure problems with heating (below primary mirror and around optical path -Nasmyth-) operating temperature other environmental conditions our choose for IRAIT telescope: Heidenhain RCN 700 series absolute encoders
16 absolute encoders Heidenhain RCN 700 series absolute encoders
17 absolute encoders 29 bits = positions per revolution 1 arcsec on sky 414 counts hollow through shaft Ø100mm
18 absolute encoders HEIDENHAIN encoders with optical scanning incorporate measuring standards of periodic structures known as graduations. These graduations are applied to a carrier substrate of glass or steel. These precision graduations are manufactured in various photolithographic processes. Graduations are fabricated from: extremely hard chromium lines on glass or gold-plated steel drums, matte-etched lines on gold-plated steel tape, three-dimensional structures etched into quartz glass, Manufacturing processes and typical grating periods: 40 µm with AURODUR 20 µm with METALLUR 10 µm with DIADUR 4 µm with etched quartz glass Circular graduations of absolute angle encoders
19 absolute encoders Photoelectric scanning HEIDENHAIN uses the imaging scanning principle for absolute angle encoders: Parallel light hits the grating structure (scanning reticle) and light passes through the gaps. When the measuring standard moves in relation to the scanning reticle, the incident light is modulated (light / no light). Photovoltaic cells convert these variations in light intensity into electrical signals.
20 absolute encoders
21 absolute encoders Heidenhain RCN 700 series absolute encoders
22 absolute encoders Heidenhain RCN 700 series absolute encoders interface card IK200
23 absolute encoders Heidenhain RCN 700 series absolute encoders (over LAN)
24 absolute encoders Climatic chamber tests (from 0 C to -45 C) in Italy (Perugia University) Tested system behaviour in working conditions (encoder rotated by a motor at different speeds) at various temperature values. A specialist from Heidenhain supervised the tests. Heidenhain suggested a series of tests over the electrical signals coming from the encoder, with a particular attention to the incremental signal, to check for a signal level degradation with low temperatures. The behaviour of the system has been perfect. The tests doesn t cover the full range of expected temperatures at DomeC, but the self-heating of the device will keep it over the minimum value tested.
25 absolute encoders tests setup Supervisor PC Climatic Chamber Chamber RH% sensor Chamber T sensor (pt100) Encoder T sensor (pt100) PLC RS- 232 Power Supply Control Box Power Supply RCN 727 Encoder Motor Heater Motor T sensor (pt100) EnDat Main PC IK 220 Pci Card
26 good luck IRAIT!
Fig. 1 In some areas, the highly accurate torque motors can replace hydrostatic drives
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