Purchase Heidenhain (Gb) Rotary Encoders With SSI/ Endat Interfaces And TTL/HTL Signals from Micromech

Heidenhain (Gb) Rotary Encoders With SSI/ Endat Interfaces And TTL/HTL Signals HEIDENHAIN (GB) is the world-leading manufacturer of angular, linear and rotary encoders, digital readouts and CNC systems.

The ROQ/EQN 425 absolute rotary encoder range includes models with SSI or EnDat interfaces and additional TTL or HTL signals.

Originally designed for use in the wind energy sector, the absolute signal measuring, position of the rotor blade and the incremental signal for the motor inverter – these encoders can be used in any application where a dual signal output is required, potentially to eliminating the need for dual encoders.

The encoders can be supplied as mounted stator coupling versions or for shaft connection with up to IP 66 protection.

For further information on this excellent product please call our technical sales desk on 01376 333333 or email tech@micromech.co.uk

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Parker Single Cable Servo Drives and Motor packages available from Micromech

Parker Single Cable Servo DrivesThe single cable servo drive system from Parker is a combination of the low inertia servomotor SME and the triple axisservo drive TPD-M based on the Hiperface DSL® digital feedback technology.

The encoder feedback communication is fully integrated into the motor power cable and so no separate feedback cable between drive and motor is required.

The new feedback system is a purely digital encoder communication protocol with exceptional performance. The absolute position determination, a resolution of up to 20 bit per turn, as well as 4096 maximum rotations, is unique in its class.

The System is completed by the multi-axis servo drive TPD-M, which represents one of the most compact solutions on the market giving the possibility of controlling up to three single cable SME servo motors with one 50mm drive module.

Parker’s single cable servo drive system provides machine builders with clear advantages over dual and multi cable configurations:

Advantages

  • Less hardware
  • Faster installation
  • Fewer connections
  • Greater reliability
  • Smaller footprint
  • Lighter weight
  • Reduced inventory costs
  • Plug-and-play with electronic nameplate feature
  • High noise immunity due to digital system
  • High investment security with straightforward retrofitting of the drive

For further information on this exciting product please call our technical help desk on 01376 333333 or email tech@micromech.co.uk

The perfect solution for countless difficult applications, SKA ARC Circular Linear Motors by Motor Power Company ……Just use a little imagination

MPC SKA ARC Circular Linear Motors

SKA ARC circle linear motors employ iron core direct drive technology to accomplish circular movements on a fixed arc, up to 360° complete rotations.

Motion can be moving coil and fixed magnetic base, or moving magnets and fixed coil which is generally used in systems with rotation higher than 360°

The modular design of each SKA ARC element allows multiple units on a single magnetic track. Final torque is directly proportional to the number of modules used.

SKA ARC circular linear motors are available in three configurations providing flexibility and versatility.

  • Three coils mounted outside the magnetic track.
  • Three coils mounted inside the magnetic track.
  • Six coils, three coils inside and three outside the magnetic track.

Features and benefits:

As with all SKA series linear motors, SKA ARC motors feature all characteristic advantages of direct drive technology:

  • Replace all transmission components (including gearboxes, ballscrews, racks, belts and pulleys).
  • Reduce/eliminate backlash, friction and inertia.
  • Improved reliability.
  • Improved precision.
  • Reduced noise levels.
  • Simplify machine design and assembly.
  • Compact design.
  • Save energy and reduce running costs.
  • Increased MTBF.
  • Complete mechanical integration inside the motor arc.
  • Improved dynamics.
  • High levels of accuracy.

The direct drive technology, used in the SKA ARC curve profile allows to reach high toque values with reduced encumbrances.

Modular design allows the addition coils to be fitted to increase torque yet still be powered by a single drive and transducer.

SKA ARC application field examples include:

● Robotics ● Rotary tables ● Tool machines ● Material Handling ● Packing machines ● Carousels ● Packaging
● Beverage machines ● Telecommunications ● Radar ● Defence ● Inertial platforms ● Accelerometers

For further information on this exciting and versatile product please call our technical help desk on 01376 333333 or email tech@micromech.co.uk

MICROMECH LTD working with supply partner PM Bearings B.V. Holland

Compact and High Precision XYZ positioning stages for Light Source and Laser Research applications.

Introduction and overview:

In most Beam-Line and Laser Target sample manipulation arrangements the installation volume available is normally very challenging as more data capture and monitoring equipment is required in one specific location. For IN-VAC research it is even more restricted in order to keep the evacuated volume as small as possible.

The current trends towards sub-micron and nanometric resolutions also establish a requirement for very solid and stiff mounting arrangements in all three axes, such that meaningful and accurate data will be retrieved.

Sub-miniature mechanisms with moving parts are by nature quite delicate and often flimsy, so difficult to ensure the degree of mechanical stiffness needed for the above resolution and good repeatability.

Positioning Stage Technologies:

The most common motion-control technologies being employed for linear transport stages can be listed as follows:-
a) Stepper motor driven lead screw.
b) Stepper motor driven ball screw.
c) DC brushed motor driven lead screw
d) DC brushed motor driven ball screw
e) Brushless motor driven lead screw
f) Brushless motor driven ball screw
g) DC Linear motor
h) Ceramic Piezo Servo 40Khz ( tuned oscillatory)
i) Piezo Legs Stepper 3Khz ( walking beam)
j) Piezo Flex
k) Piezo Saw-tooth stepper.
l) Voice Coil DC Servo.

Comparative cost:

All of the above work well in principle and can be designed to achieve 100 nm resolution or ‘move sensitivity’…. ..or better in the case of Piezo technology.

Apart from the difficulty of installation volume, the other significant challenge in most research projects is budget.

So all of the above can be assigned a ‘typical’ price category as follows:-

Items a) to d) Lowest cost.

Items e) and f) Medium cost.

Item g) High cost.

Items h) to i) Highest Cost.

Comparative size:

The following categorises the installation size from ‘most compact’ to ‘largest’ with some indicators on the aspect of the installation volume required:-

j) Piezo Flex . Most compact but very small linear range. Microns.

i) Piezo Legs. Very compact with linear range up to 150mm. 10 to 15 mm /sec

h) Ceramic Piezo Servo 40Khz . Quite compact with linear range 200mm.
200mm /sec.

l) Voice Coil DC Servo. Varies with linear force and stroke required.

k) Piezo Sawtooth stepper. Quite narrow, but long in aspect. Low force and slow. 10mm per sec.

g) DC Linear motor. Quite compact . Travel unlimited. 7000mm per sec.

a) Stepper motor driven lead screw. Short motor body and nut. 20 to 50 mm per sec depending on screw pitch.

e) Brushless motor driven lead screw. Short motor body and nut. 50 to 100 mm per sec depending on screw pitch.

b) Stepper motor driven ball screw. Short motor body but longer ball-nut. 100 to 200mm per sec. Depending on screw pitch.

f) Brushless motor driven ball screw. Short motor body but longer ball-nut. 200 to 500mm per sec. Depending on screw pitch.

c) DC brushed motor driven lead screw. Long motor body but short nut. 50 to 100mm per sec. Depending on screw pitch.

d) DC brushed motor driven ball screw. Long motor body but short nut. 200 to 500mm per sec. Depending on screw pitch.

Notes:
1) All piezo and voice-coil driven systems require a linear encoder for position control.

2) All DC motor driven systems require a linear or rotary encoder for position control.

3) Stepper systems do not require any encoder unless resolution and linear precision required dictates the need.

Electrical Drive systems and Motion Control interfaces.

All of the above ‘motion providing’ devices will require a power drive plus a position controller interface to effect precision positioning.

a) Stepper Motors.
These are the most popular devices used in research applications as they are stable when the supply is off or there is no command pulse train. The stepper drives are also lowest cost.

b) DC Brushed Motors.
These are most popular in miniature devices as the motor body size can be as small as 8mm Dia. The drives are relatively low cost. A rotary encoder is required for position control.

c) DC Brushless Motors.
The drives required for these are more expensive and normally require an Encoder feedback for position control applications.

d) DC Linear Motor.
The drives required for these are virtually the same as for the DC Brushless rotary motors. An Encoder is always built into the assembly for phase commutation but a more precise linear encoder may be required for a particular application.

e) Voice-Coil Linear servo.
A special power amplifier is required and a feedback encoder.

f) Piezo Technology.
All piezo technology motors require a specific type of drive amplifier for their individual design. The simplest is the Piezo Legs as it is very similar to a stepper motor drive technology and low cost to produce.

g) Motion Controllers.
Most Research establishments use versatile multi-axis ( 4, 8, 12 or 16 axis) controllers which can be software configured to drive Stepper Motors, Brushed or Brushless servos. They cannot drive Piezo devices though so an intermediate piezo amplifier or controller is required to be commanded by step and direction or an analogue set point form the motion controller. So this extra cost makes Piezo systems the most expensive to use.

Innovative compact XYZ Stage products from Micromech Ltd.

From the information above it can be seen that the ‘lowest cost’ product is given by the Stepper Motor driven lead-screw stages or the DC Brushed motor lead screw stages. In the case of the DC motor types an additional high ratio gearhead is normally included to increase the torque and reduce the output shaft speed to a more useful level. This just makes the motor assembly much longer. So although the linear stages themselves may be quite compact the length of the overall assembly is often doubled by the long, in-line motor assembly with gearhead, coupling and encoder, extending from each axis element.

In collaboration with our Dutch supply partner PM Bearings we have devised the compact XYZ stepper stage using an integral ‘Yoke Thrust’ arrangement which is mounted in parallel to the stage footprint. A precision linear encoder is also integrated plus small ‘end of travel’ limit switches.
The illustrations below show a 50mm x 50mm x 50mm travel XYZ stage and the smaller 10mm x 10mm x 10 mm travel XYZ stage.

Both these designs take up the smallest cube volume possible as there are no motor bodies extending from the stages.

The thrust elements are spring-preloaded so there is no backlash and the linear encoder can give a move resolution or sensitivity of 0.1 micron. So these will be good for achieving reliable 1micron integrity over the travel range.

If specific accuracy is not required the stepper motor open loop resolution without linear encoder can be as small as 1.5 micron per full step ( 0.3 mm pitch) with more subdivision at half step or micro-stepping mode although it must be emphasised at this point that micro-stepping is not a reliable position division process beyond one full step ( 1.8 degrees).

This open loop performance is still very impressive.

Fig A. Partial Solid view of XYZ Stage with 50mm x 50mm x 50mm Travel.

PM Bearings XYZ Stages

The linear stages used in this XYZ assembly are high performance cross – roller tables produced by PM Bearings with payload capability far exceeding the linear thrust of the stepper motor. These small thrust motors can provide up to 100 N force at slow speeds with phase current levels of 0.49 Amps Bipolar from a 24V DC powered Stepper Drive. A Numerik Jena linear encoder is used in this assembly from Heidenhain.
Vacuum compatible versions can be built up to 10^-7 Torr or millibar by selection of suitable encoders and thrust motors.

Fig B. GA of XYZ Stage with 50mm x 50mm x 50mm travel.

PM Bearings XYZ

Fig C. GA of XYZ Stage with 10 x 10 x 10 mm travel.

PM Bearing XYZ

The same 20mm square frame ( Nema 8 ) Hybrid Stepper Thrust motors are used in this smaller assembly but the linear encoder is a Micro-E type due to the miniature integration requirement.

Connectors and cable management.

Encoder cables are brought out independently as they may be routed directly to the motion controller. Each axis has a sub D connector on a short cable for handling the Stepper Motor and Travel End Switch connections.

As these stage assemblies are custom built they can be supplied in 1 axis 2-axis or 3-axis versions. Larger footprint X-Y stages can be designed having a common centre plate for lower profile and increased lateral stiffness , but still combining a thrust stepper yoke assembly to specifically meet the application loading requirements.

For all enquiries about these special units please contact: MICROMECH SALES OFFICE on 01376 333333

Pick the right Parker Electro Thrust cylinder for your application:

The new Parker Electro Thrust Cylinder (ETH) is now available from Micromech, Parker’s premier systems integration partner.

Parker ETH CylinderThe new Parker ETH is a product that closes the gap between pneumatic and hydraulic drive technology – offering a replacement that increases reliability and is more economical.

The new High Force Electro Thrust Cylinder (ETH) has unrivalled power density and is compact. Micromech can also supply a complimentary range of controllers, motors and gearboxes.

Features and benefits:

  • High service life
  • Unrivalled power density – high forces and small frame sizes
  • Reduced maintenance costs thanks to lubricating access in the cylinder flange
  • Easy replacement due to pneumatic ISO flange norm (DIN ISO 15552:2005-12) conformity
  • Integrated anti-rotation device
  • Reduced noise emission
  • Cabling can be concealed in the profile
  • Accessories with integrated force sensors help to distribute and precisely control linear forces.
  • Optimised for safe handling and simple cleaning
  • One stop shop: We offer the complete drive train: Drive, controller, motor and gearbox to match the Electro Thrust Cylinder

Please follow the link below for Parker’s on line sizing tool which provides an easy step-by-step method for selecting the right ETH cylinder for the job. Alternatively contact Micromech to discuss your application with one of our experienced engineers who will be happy to size a cylinder for you and provide a competitive quotation.

Online Sizing Tool

Parker ETH Sizing Tool

ETH Product Video

ETH Product Overview

Download CAD files for ETH

For assistance in specifying the correct ETH cylinder for your application, contact Micromech on 01376 333333 or Email sales@micromech.co.uk

Kollmorgen KSM Safety Solutions Significantly Improve Productivity.

The Kollmorgen KSM completes the motion safety chain from sensor-to-drive.

  • A KSM Motion Safety solution delivers higher productivity.
  • System costs are kept low as standard of-the-shelf components can be used.
  • Modular design provides flexible and expandable safety solutions.
  • Tested and certified by TUV to PLe (ISO 13849) and SIL3 (IEC 61508)
  • Seamless interface with Kollmorgen AKD, ServoStar and motion systems.
  • Modules available to provide all important safety functions.

Safety Functions for PL e and SIL 3

  • Safe Stop Function: STO, SS1, SS2, SOS
  • Safe Velocity Function: SLS, SSM, SSR, SMS
  • Safe Position Function: SLP, SCA, SLI
  • Safe Direction Function: SDI
  • Safe Brake Function: SBC

Connectivity

  • EtherCAT
  • CANopen
  • Profinet
  • PROFIsafe and EtherCAT FSOE slave

Combining KMS with AKD servo drives and other Kollmorgen products, Micromech can help you develop expandable motion systems, which will increase performance and productivity at lower costs.

KSM-compact Safety Module

  • For 1 or 2 safe axes
  • Up to 2 expansion modules
  • Base unit with 16 safe I/O
  • Expandable up to 60 safe I/O
  • 1 safe relay output, expandable
  • 2 pulse outputs, 2 standard outputs
  • Expandable up to 6 pulse and 6 standard
    outputs
  • Up to 800 function blocks
  • Space-saving, compact design

KSM-modular Safety PLC

  • Up to 12 safe axes
  • Up to 8 expansion modules
  • Base unit with 56 safe I/O
  • Expandable up to 200 safe I/O
  • 1 safe relay output, expandable
  • 2 pulse outputs, up to 10 standard outputs
  • Expandable up to 14 pulse and 22 standard
    outputs
  • Up to 3000 function blocks
  • For applications with high number of interfaces

Motion Safety – The Concept for Safe Motion

Kollmorgen’s innovative safety technology combines safety logic and drive monitoring in the drive. Conventional safety technology keeps the operator away from areas with hazardous motion but Kollmorgen drives with Motion Safety allow operator intervention without process interruption.

Productivity Gains with Motion Safety

Intelligent Safety functions monitor areas with hazardous motion allowing the machine toeffectively intervene with minimal process interruption. Functions such as safe position (SLP) limit the range of machine motion to ensure that personnel remain safe. Machine zones that do not pose risk to the operator remain running. The diagram opposite shows the gain in productivity. It can be seen from the yellow line that with Kollmorgen Motion Safety technology, production continues during user intervention

Micromech – Your Skilled Partner for Safe Motion Control Solutions

Choose Micromech as your motion control partner for assistance specifying Kollmorgen safety logic, servo drives and motors and complete safe automation solutions.

Contact Micromech on 01376 333313 or email sales@micromech.co.uk