How to Select AC Servomotors Image Credit: KEB America, Inc. | Torque Systems | Exlar    AC servomotors are AC motors that incorporate encoders are used with controllers for providing feedback and closed-loop control. These motors can be positioned to high accuracy, meaning that they can be controlled exactly as required for the application. Often servomotors have better bearings or higher tolerance designs, and some...
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Q & A on AC Servomotors

We asked our users for their input on AC Servomotors. Here are the results of 71 users familiar with AC Servomotors.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice

Design TrendsTop

Q:
What new technologies are influencing AC servomotor design?
11 answers
Answers:
No new technologies- improvement on components are the driving force. Like better CPU, better interface, better encoder, etc...
~Liewhk H, Marketing/Sales, Penang, Malaysia
Smaller mass, bigger power and better electronics.
~Marko G, Design Engineer, Zadar, Croatia
Power electronics, DSP controllers, new materials.
~Marko R., Assistant - student, Cacak, Serbia
RFID Tag printing and laser die cutting.
~Baskaran N, General Management, Chennai, India
Simpler ways to implement a system.
~Engineering, Consulting, Eagle, WI
Time response, acceleration.
~Engineering, Design, Genova, Italy
Linear bearings and encoders.
~Engineering, Faculty/Staff/Student, Viseu, Portugal
Speed controller inverter.
~Venkataramana Babu, Technical Support, Bangalore, India
New product designs.
~Quality Control/Assurance, Toronto, Canada
Size and torque
~Bernard T., Electrical Maintenance Manager, Accra, Ghana
Smaller drives
~Joe T, Engineer, Palmyra, NJ

Q:
From your perspective, which companies are creating the most innovative AC servomotors?
11 answers
Answers:
Parker, Danaher, Bosch-Rexroth
~Design Engineer, Torrance, CA
Baldor
~Venkataramana Babu, Technical Support, Bangalore, India
I use Emerson motors because they have many options that I can use to match the job requirements. High inertia, low speed, feedback types etc.
~Engineering, Design, Watertown, CT
Indramat FANUC Siemens
~Quality Control/Assurance, Toronto, Canada
LENZE (most familiar)
~Bernard T., Electrical Maintenance Manager, Accra, Ghana
Rexrorth, Germany.
~Baskaran N, General Management, Chennai, India
Parker Hannifin
~Engineering, Faculty/Staff/Student, Viseu, Portugal
Allen Bradley
~Joe T, Engineer, Palmyra, NJ
Rexroth
~Engineering, Design, Genova, Italy
Hstec
~Marko G, Design Engineer, Zadar, Croatia
Fanuc
~Jim B, Engineering Consultant, Charlestown, NH

Applications and UseTop

Q:
What are some of the applications you have used an AC servomotor for?
17 answers
Answers:
Lately - simple indexing drives. I have also been given motor specs and retrofitted them into existing machine tools for both positioning and accurate rotational speeds for mills and taps.
~Joe T, Engineer, Palmyra, NJ
To drive Haul-Off that pulls off uPVC and HDPE pipes. Also the feeding of PVC resin material into an extruder and other few applications.
~Bernard T., Electrical Maintenance Manager, Accra, Ghana
Applied them to grinding machines. Adapted drives to custom motors.
~Engineering, Design, Watertown, CT
In Printing Machines for printing plate registration application.
~Baskaran N, General Management, Chennai, India
Machine Slide Motion Workholding and cutting tool spindle
~Jim B, Engineering Consultant, Charlestown, NH
Machine industry, revolver heads for CNC machines
~Marko G, Design Engineer, Zadar, Croatia
Feed controls, axis movement controls, spindle
~Quality Control/Assurance, Toronto, Canada
CNC Machines, machine tools, filling applications
~Carlos R, Builder/Contractor, Valencia, Venezuela
Different types of laboratory exercises
~Marko R., Assistant - student, Cacak, Serbia
Measuring table for back gauge motor.
~Engineering, Other, Sukorejo, Indonesia
Ball screw drive, indexing
~Liewhk H, Marketing/Sales, Penang, Malaysia
Steam Turbine Control
~Engineering, Design, Genova, Italy
Synchronizing axis.
~Engineering, Faculty/Staff/Student, Viseu, Portugal
Metal spinning.
~Venkataramana Babu, Technical Support, Bangalore, India
Light robotics
~Design Engineer, Torrance, CA
Roof top units
~Other, Westminster, CO
Cut to length
~Engineering, Consulting, Eagle, WI

Q:
Please share with us any “non-standard” applications that an AC servomotor has been used for.
5 answers
Answers:
One professional machine for fitness.
~Marko G, Design Engineer, Zadar, Croatia
Advertising panels.
~Baskaran N, General Management, Chennai, India
Large RF scanners.
~Design Engineer, Torrance, CA
Gas turbine IGV
~Engineering, Design, Genova, Italy
Screw driven
~Venkataramana Babu, Technical Support, Bangalore, India

Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of an AC servomotor?
5 answers
Answers:
You can burn and destroy motor.
~Marko G, Design Engineer, Zadar, Croatia
Somebody used wrong bearings.
~Quality Control/Assurance, Toronto, Canada
Motor winding failure.
~Baskaran N, General Management, Chennai, India
Torque reduction with load
~Venkataramana Babu, Technical Support, Bangalore, India
Yes, I have heard stories, but never witnessed a mishap.
~Design Engineer, Torrance, CA

FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
8 answers
Answers:
Smaller / less expensive drives with greater long term reliability.
~Joe T, Engineer, Palmyra, NJ
Should be able to be driven by any other manually frequency drive.
~Bernard T., Electrical Maintenance Manager, Accra, Ghana
Maximum torque to size of motor.
~Jim B, Engineering Consultant, Charlestown, NH
Light weight & high torque.
~Baskaran N, General Management, Chennai, India
Easy to use like stepper.
~Liewhk H, Marketing/Sales, Penang, Malaysia
IGV for gas turbine.
~Engineering, Design, Genova, Italy
Speed torque
~Quality Control/Assurance, Toronto, Canada
Drop tower
~Venkataramana Babu, Technical Support, Bangalore, India

Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of an AC servomotor?
6 answers
Answers:
Space available in your system and the vendor recommended space and room temperature.
~Baskaran N, General Management, Chennai, India
-Environment should key when selecting servomotors -Choose the right manufacturers so that proper ventilation is provided
~Bernard T., Electrical Maintenance Manager, Accra, Ghana
Over sizing a drive can be just as bad as under sizing a drive.
~Joe T, Engineer, Palmyra, NJ
Understand your needs first, before selecting the appropriate motor and control system.
~Liewhk H, Marketing/Sales, Penang, Malaysia
Use spare oem parts or equivalent
~Quality Control/Assurance, Toronto, Canada
Torque characteristics not noticed.
~Venkataramana Babu, Technical Support, Bangalore, India

Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using AC servomotors?
8 answers
Answers:
Compare output to size of motor and only purchase from builders with a reliable service network.
~Jim B, Engineering Consultant, Charlestown, NH
Quality winding and insulation class for working temperature for continuous use.
~Venkataramana Babu, Technical Support, Bangalore, India
Look for vendors with a good support base. And often you get what you pay for.
~Joe T, Engineer, Palmyra, NJ
Please study your requirement with futuristic design concepts..
~Baskaran N, General Management, Chennai, India
Servo system price kept on dropping, try one for your self.
~Liewhk H, Marketing/Sales, Penang, Malaysia
-User friendly -Maintenance cost is less -Robust etc.
~Bernard T., Electrical Maintenance Manager, Accra, Ghana
You need to know what you want.
~Marko G, Design Engineer, Zadar, Croatia
Do not change specifications
~Quality Control/Assurance, Toronto, Canada


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