lelef ha scritto:a furia di cercare per il web oltre ai gecko e ai loro simili inglesi ho trovato questi che uno si può anche costruire da solo , sono più economici,più prestanti più precisi da settare ...
Ciao e grazie dell'info,
leggendo le caratteristiche direi che è molto buono come progetto anche perchè è completo di ponte ad H e soprattutto usato da molte persone.
Ho visto un video con un motore a velocità bassissima, quasi fermo, senza scattini molto fluido.
Quasi quasi finisco la mia fresa usando il servo controller di Uli (sono fermo da un anno, non ho più tempo di scrivere neanche una linea di codice).
Provo a sentire Uli per 4 controllers e i pcb da Manjeet.
Saluti.
Q: What encoders are suitable ?
A: These are incremental rotation encoders with two channels and 90 deg. phase shift. Usually these channels
are named 'A' and 'B'. Encoders with 250 to 1.000 lines per revolution are best. By decoding all edges of the
signals, the controller resolution will be 1000 to 4000 steps per revolution.
The electrical parameters depend on the circuit design. The common PCB needs a 5V TTL Signal.
Other designs may use 5V differential, 11uA or 1Vpp.
Q: What are the speed limits of the UHU ?
A: The maximum proven speed was 303 kHz with activated analyzer function. Using a 512 line encoder this is
about 9.000 rev/min. Such a speed however cannot be guaranteed for all operating conditions and is dependent
on the recalculation cycle value and the step multiplier.
150.000 steps per second is what you can expect for sure. The speed of the machine is dependent on the
mechanical setup (gear, lead screw).
Technical specification UHU Servocontroller 3.00:
Controller
Platform: Atmel Attiny2313
Operating frequency: 24 MHz
Operating principle: enhanced PID
Loop parameters: 3 setups storable in EEPROM and secured by forward error correction
Speed: up to 250.000 steps/s (4-fold encoder steps)
Communikation:
interface: RS232 34.800, 8 Bit, 1 Stop, No Parity
logic: command line, plain text
Inputs PC: step/dir
encoder : A/B 90°, 4-fold
emergency stop: Active Low
Outputs: Ready (LED)
PWM (10 Bit, symmetric)
power enable
error (LED)
Enhanced functionality: - Higher derivative feedback for stabilisation with minimal impact on
positioning error
- adjustable tracking-error shutdown
- detection of false encoder inputs
- loop in of error conditions
- step multiplier for the use of high resolution encoders
- continous output of tracking error values for visualisation on external PC
PCB
Size: 1/1 euro format (160x100mm)
Technology: single sided, no SMD, EMC optimized
Power stage: - MOS-FET technology
- adjustable maximum current
option 1: IRF540 max 10A/60V
option 2: IRFP260N max.30A/150V
Interfaces: encoder: TTL
step/dir: TTL through opto coupler
RS232: V.24 with built in level shifter and 1:1 connector SubD9
error in/out: 5 V wired-or, active low
Power supply: 12 V regulated (logic)
< 150V DC unregulated (power)
Signore dammi la pazienza, ma dammela subito.