One thing I wasn't expecting to be prepared for. Piezos are used for loudspeakers…drive frequency is 2 kHz. Get it? Very loud and annoying :P They do however work well.

They are also reasonably low torque. Will do some experiments to see how they drive some of my linear stages.

Actuators

Bare actuators:

  • 830X Picomotor Actuators
    • 8301-8341: standard
      • In: 4 pin RJ-22
    • 8301v-8341v: vacuum compatible, standard
      • In: 4 pin teflon insulated RJ-22
  • 8351 Tiny Picomotor Actuator
    • In: 4 pin RJ-22
  • 8310 closed loop driver
    • In: 4 pin RJ-22 and HDDB-15M

Units:

  • 8051 fiber positioner
    • In: 6 pin RJ-11
  • 8071, 8081, 8082: 4/5 axis stages
    • In: 2X 6-pin RJ-11
  • 8095: 6 axis stage
    • In: 6X 4-pin RJ-22
  • 8401 rotary stage
    • In: 1X 4-pin RJ-22
  • 8807 mirror mount
    • In: 2X 4-pin RJ-22
  • 8808-8854: mirror mount
    • In: 1X 6-pin RJ-11
  • 888X: pint size mounts
    • In: 2X 4-pin RJ-22

“Note: The knob on the end of the drive screw provides inertial mass required for operation. Removal of the knob will prevent the Picomotor from functioning properly and void the warranty.”

Pinout

4-pin RJ-22:

  • 1: NC
  • 2: GND (power)
  • 3: MOTOR
  • 4: GND (motor)

Has note saying that the two GNDs are electrically connected.

Driver

There seem to be at least two different driver systems: “intelligent” / network system and stand alone drivers.

“The Picomotor drivers generate the 130-V pulses required to drive the piezo in the Picomotor.”

Network

Basically a controller receives input from either a joystick, pendant, ethernet, or RS-232 which then relays a signal to RS-485 daisy chained (Distributed Control Network (DCN)) open and/or closed loop drivers. Free Windows DLL available (advertised in manual, haven't looked into it). Runs off of 24VDC (min/max varies) using standard Phoenix Contact Combicon compatible quick disconnects.

Major family components:

  • 8750 Intelligent Picomotor Network Controller
    • Input: RS-232 or joystick
    • Output: DCN
    • Does not support 8751-C driver
    • Does not support 8757 hand terminal
    • 12-32VDC (some funny thing that you can really do 10-40VDC), < 100 mA at 24VDC
  • 8751 iPico closed loop driver
    • Used with 8310 actuator
    • Output: 1 4-pin single channel picomotor driver
    • 12-32VDC, 17W typical @ 2kHz sustained speed
  • 8752 Intelligent Picomotor Ethernet Controller
    • Input: RS-232, joystick, or ethernet
    • Output: DCN
    • Supports 8751-C driver
      • NOTE: requires firmware 1.5.0+
    • Supports 8757 hand terminal
    • 12-32VDC (some funny thing that you can really do 10-40VDC), < 100 mA at 24VDC
  • 8753 iPico open loop driver
    • Output: 3 4-pin single channel picomotor driver
      • XXX: why 4 pins if its just a peizo?
    • Multi axis devices require 8725 multi-axis adapter
    • 21-29VDC, 0.65A typ
  • 8754 iPoco joystick
    • Use directly with 8750 (or 8752 I presume)
    • Standard DCN device…should be able to put in daisy-chain
  • 8757 iPico Handpad / Hand Terminal
  • LS-773 Open Collector I/O module (LOGOSOL NETWORK I/O NODE LS-773“)
    • Same spects as LS-784 except 6 OC outputs can drive 1A and 1 SSR can drive 5A
  • LS-784 Open Emitter I/O module (“LOGOSOL NETWORK I/O NODE LS-784”)
    • Inputs
      • 10 digital
      • 3 analog (0-5V, 0-10V, 0-20V, 0-30V selected by DIP switch)
        • How many bit? Bandwidth?
      • 1 of above can be counter or timer with pre-scalar
    • Outputs
      • 8 open emitter (0.5A each)
      • 2 of above can be 8-bit PWM

Additionally:

  • 8721 10' comm cable
  • 8722 Comm adapter
    • Basically RS-485 ⇔ RS-232 adapter in place of 8750 or 8752
  • 8724 5” comm cable
  • 8725 multi-axis adapter
  • 8726 6“ power cable
  • 8755 power supply
  • 8763-KIT: 8752 ethernet controller + 8753 driver + power supply + cables

Precision / repeatability

According to manual, step size varies considerably. Standard drivers < 30 nm, Tiny < 100 nm. From standstill or changing direction will cause significant variance. Other factors include direction, load, temperature, and wear.

 
equipment/cnc/picomotor.txt · Last modified: 2013/10/20 14:59 (external edit)
 
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