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Handbook For High-Performance Brushless Servo Systems February 7, 2013

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Published by ElectroCraft,  12pages

Comparison of DC servomotors and brushless servomotors

ElectroCraft Handbook For High-Performance Brushless Servo Systems

ElectroCraft Handbook

The traditional permanent magnet DC servomotor has been the industry workhorse for many decades in highperformance servo drive applications.  The primary reason for this is that the DC servomotor is very easy to control using adjustable DC voltage.  A brief review of the operating principle of the DC motor illustrates this point (continued)…

Click on the link below to download this Free Handbook.

http://www.servo2go.com/support/files/ElectroCraft%20EC_Handbook%20for%20High-Performance%20Brushless%20Servo%20Systems-Final%20S2G.pdf

More information on brushless servo motors from ElectroCraft can be found at the link below-

http://www.servo2go.com/supplier.php?id=1189973790

For more information, please contact:

Editorial Contact:

Warren Osak
sales@servo2go.com
Toll Free Phone:  877-378-0240
Toll Free Fax:   877-378-0249
www.servo2go.com

NEMA Frame Brushless Servo Motor/Encoders from ElectroCraft December 19, 2012

Posted by Servo2Go.com in New Product Press Releases.
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ElectroCraft EXC23 Brushless Servo Motor

ElectroCraft EXC23 Brushless Servo Motor

The EXC-Series 2.3-inch AC Servo motor offers customers high economic value and superior reliability. The EXC-Series is a cost-improved version of the popular Excalibur family of AC Servo motors sold under the Rockwell Automation brand. This product provides considerable cost improvements for a variety of light industrial, commercial, and medical applications.

The ElectroCraft RapidPower™, EXC, and E-Series are fast, low vibration BLDC motors. By utilizing M-8 ceramic and rare-earth neodymium magnets, these BLDC motors provide the quick acceleration and consistent speed (up to 15,000 rpm) needed for applications such as centrifuges, fans and pumps.  Sealed ball bearings and reduced torque ripple from skewed magetization also ensure a smooth operation at any speed.

More information on NEMA Frame Brushless Servo Motor/Encoders from ElectroCraft can be found at the link below-

http://www.servo2go.com/search.php?search=ElectroCraft RapidPower&D=PROD

For more information, please contact:

Editorial Contact:

Warren Osak
sales@servo2go.com
Toll Free Phone:  877-378-0240
Toll Free Fax:   877-378-0249
www.servo2go.com

Check Out Our Servo Products Datasheet October 16, 2012

Posted by Servo2Go.com in New Product Press Releases, Technical Support Information.
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Applied Motion Products is pleased to announce the release of a new, 16 page Servo Products Datasheet.  This colorful brochure details our broad servo system offering, with M and V series motors ranging from 50 to 750 watts of continuous output power and both AC and DC powered drives from our popular BLu and SV lines.  All motors include precision incremental encoder feedback. Drives can be operated in torque, velocity or positioning modes, can execute stored Q or Si programs, as well as streaming commands delivered over RS-232, RS-485, Ethernet, EtherNet/IP and CANopen communication interfaces. All systems include easy to use set up and tuning software at no cost.

Applied Motion Products Servo Products Catalog

Applied Motion Products Servo Products Catalog

Popular accessories include extension cables, break out boards, regeneration clamps and communication adapters.

For more information on the Servo Products from Applied Motion Products, click on the link below-

http://www.servo2go.com/search.php?search=Quick Tuner&D=PROD

For more information, please contact:

Editorial Contact:

Warren Osak
sales@servo2go.com
Toll Free Phone:  877-378-0240
Toll Free Fax:   877-378-0249
www.servo2go.com

How To: Reduce Noise Output from a Brushed Motor April 19, 2012

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Pittman's Brush DC Motor Family

Pittman's Brush DC Motor Family

Noise is often the single toughest challenge faced by design engineers when developing products especially in medical applications.

The inherent noise issue with many types of motors is the brushes.  Brushes create mechanical and electrical noise due to friction against the commutator, as well as arcing caused by current conducting through the brush and commutator.  A reduction in noise level of 10 decibels is an impressive achievement.  The decibel scale is logarithmic, not linear. Every three dB decrease of the sound level cuts the intensity of the sound by half.

 

Examine the following factors to reduced noise:

  • Look into different varnishing processes
  • Inquire about custom carbon brushes
  • Tighten machining tolerances

The data shown in the graph represents the 1/3 octave band testing data taken on a PMDC motor before and after the bullet pointed customizations.

For design engineers working on a noise reduction project, the motor design is only a part of the challenge. Radiated noise can be amplified through the other components in the system. Here are some additional tips for reducing noise:

  • Avoid using sheet metal and structural components that will resonate with the motor
  • In some cases, the use of vibration isolators to mount the motor can help
  • Accurately align of the driven components to the motor

*Note: the higher the RPM of the motor the more sound will be radiated from the motor.

Click on the link below for information on the Servo Motors available from Servo2Go.com –

Servo2Go’s Servo Motor Product Family

For more information, please contact:

EDITORIAL CONTACT:
Warren Osak
sales@servo2go.com 
Toll Free Phone:   877-378-0240
Toll Free Fax:       877-378-0249
www.servo2go.com

How to Calculate Motor Torque Constant April 3, 2012

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The torque constant, Kt, of a motor is a very useful parameter for sizing and controlling motors showing a linear speed / torque relationship.  Both DC brush type and brushless motors exhibit this linear performance curve relationship.

Servo2Go's Brushless Servo Motor Family

Servo2Go's Brushless Servo Motor Family

Without getting into theoretical detail, Kt is simply the slope of the torque / current curve of a motor.   The units of the constant are found in torque units per amp. (e.g. N-m/amp, oz-in/amp, etc.) Kt can be useful in both design and application.  Looking at the current in the system the designer or control system can calculate the actual torque output of the motor during operation.  This can be used in a variety of ways.  It allows the designer to understand the actual load that is seen in the application and understand if the optimal motor for the application is being used.   On the control side, a control can be set up with a current limit to ensure that the mechanical system is not over loaded or it can be used to assure that the motor does not overheat during use.  

Additionally, Kt is used in torque mode applications to maintain a controlled amount of torque to meet the application needs.  Example:  The power source for the application allows for the motor to draw a maximum current of 10 amps. Based on the design, you need to drive a maximum load of 10N-m. What is the minimum Kt needed for this application?

It should be noted that the parameter Kt is not related to the voltage under which the motor is operated.   If you use the motor at 12VDC or 24VDC this constant will remain the same.  This attribute of the motor is very useful as the motor is used in a motion control system.   The overall torque output of the DC motor system is maintained by monitoring current while the motor’s speed output is varied by controlling the voltage into the motor.

Click on the link below for information on the Servo Motors available from Servo2Go.com –

Servo2Go’s Servo Motor Product Family

For more information, please contact:

EDITORIAL CONTACT:
Warren Osak
sales@servo2go.com 
Toll Free Phone:   877-378-0240
Toll Free Fax:       877-378-0249
www.servo2go.com

Reducing cogging torque in brushless motors March 29, 2012

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Selecting the number of rotor poles and slot combinations to reduce cogging is not an intuitive exercise.  Take advantage of these guidelines based on pretested configurations to help you optimize your next motor design.

Cogging torque in dc brushless motors comes from variations in magnetic field density around a rotor’s permanent magnets as they pass the nonuniform geometry of the slot openings in the stator.  In applications such as servosystems and spindle drives, the pulsating speed that cogging generates can blemish machined surfaces or reduce position accuracy. 

Unfortunately, classical electromagnetic calculations do not provide the data needed to determine how much cogging torque might develop in a new paper design.  Although a complete finite-element analysis may be an alternative to manual methods, it usually requires more project time than is available.  In most cases, several prototypes must be made to measure and eventually reduce the cogging torque.  Thus, it is critical to have a simple check list of major factors that determine cogging torque during the initial design procedure so several iterations can be made before finalizing the drawings.

Major factors affecting cogging torque include magnetic wave shapes, air-gap length, slot opening, number of stator slots and rotor poles, skewing, copper fill, pole pitch, flux distribution or density, magnet volume, and material weight.  Relationships between some of these factors, including electrical degrees/cycle, and cycles/rev vary among multiple-pole motors.  

Analyzing the ripple torque for each type leads to a set of guidelines for new designs.  For example, the maximum number of cycles in one electrical cycle for a stator with an even number of slots can equal the number of slots itself.  But for a motor with an odd number of slots, the number of cycles can be twice the number of slots.

Moreover, for a given frame size and type of lamination, slot and pole combinations as well as different pole arc to pitch ratios and magnetization, can produce different cogging torques.  Keeping the number of poles on both rotor and stator ID and slot openings constant, and varying the number of slots, shows how cogging torque behaves for different slot and pole combinations.

Skewing the magnets or the stator core often can lower cogging a bit more.  When a design without skewing already shows minimal cogging, the skew angle required to reduce cogging below a particular value will be much smaller.  Also, designing for a trapezoidal or nearly sinusoidal air-gap wave-form (made by varying the pole arc to pole-pitch ratio) is a common practice that often reduces cogging torque even further.

Click on the link below for information on the Servo Motors available from Servo2Go.com –

Servo2Go’s Servo Motor Product Family

For more information, please contact:

EDITORIAL CONTACT:
Warren Osak
sales@servo2go.com 
Toll Free Phone:   877-378-0240
Toll Free Fax:       877-378-0249
www.servo2go.com

New SVAC3 Digital Servo Drive Features EtherNet/IP Connectivity January 29, 2012

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Greenville,DE—   Servo2Go.com has just added Applied Motion Product’s New SVAC3 Series Digital Servo Drives to its broad range of high performance servo amplifiers used in Industrial Automation applications. 

The SVAC3 is a powerful servo controller in a compact and cost effective package. This AC powered drive is loaded with features and options that make it a great choice for many OEM applications. SVAC3 drives can be controlled via analog signal or step and direction inputs. Alternatively, they can be programmed to act as stand-alone units with the power of Q Programmer™.  

SVAC3 Servo Drive with Nema 34 Brushless Motor

All models include EtherNet/IP industry-standard network communication which simplifies connection to the supplied Windows PC software for configuration and tuning, and allows applications to communicate in real time using the SCL and Q languages over standard 100Mbit Ethernet cabling, addressing and protocols.

The SVAC3 also provides an upgrade path for users who want to migrate from step motors to servo motors without a large cost increase. Paired with a V or M series servo motor, the SVAC3 servo drive offers great value.  

Three drive models are available, each in 120VAC and 220VAC versions. The 120V versions provide up to 3.5 A rms continuous current and 7.5 A rms peak. The 220V versions provide up to 1.8 A rms continuous and 5.4 A rms peak.   A built-in regeneration (power dump) circuit safely disperses incoming energy from rapidly decelerating inertial loads.  

There are 3 control options available with the SVAC3 servo drives: S, Q and IP.

  • “S” drives can operate in analog torque/velocity, pulse & direction, and streaming serial (SCL) control modes. Select the control mode, tune the servo motor and configure the drive using the Quick Tuner™ software
  • “Q” drives can operate in all of the same control modes as S drives, plus they have the ability to run stand-alone Q programs stored in non-volatile memory. Q program are created using the Q Programmer™ software, and provide multi-tasking, math functions, conditional processing, data register manipulation, and more features in a robust yet simple text-based programming language. Like S drives, Q drives must first be set up and tuned using the Quick Tuner™ software
  • “IP” drives come with built-in EtherNet/IP network communications, the widely used industrial protocol for manufacturing automation applications. With EtherNet/IP, users can control, configure and query the drive using an open, standards-based, industrial Ethernet connection at speeds up to 100 Mbits/sec. The SVAC3-IP drives run all of the same control modes as Q drives, with the addition that all drive features can be accessed over EtherNet/IP, including more than 100 commands and 130 registers for controlling motion, I/O, configuration, polling, math, register manipulation, and Q programming. SVAC3-IP drives are set up and configured using Quick Tuner™, while Q programs are created using Q Programmer™ 

Click on the link below for additional information-

New SVAC3 Digital Servo Drive Features EtherNet/IP Connectivity

For more information, please contact:

EDITORIAL CONTACT:
Warren Osak
sales@servo2go.com 
Toll Free Phone:   877-378-0240
Toll Free Fax:       877-378-0249
www.servo2go.com

Brush-Commutated DC Motors Deliver Smooth-Running Performance and Quiet Operation February 1, 2011

Posted by Servo2Go.com in New Product Press Releases.
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Pittman Series 8300 brush-commutated DC motors offer smooth-running performance and quiet operation in a powerful small package. These 26-mm motors ideally suit medical/biotech and other applications requiring high performance, long life, and reliability.

Pittman DC Motors

This family of iron core DC motors incorporates bonded neodymium iron boron magnets, providing economical alternatives to coreless products. Key motor features include seven-slot skewed armatures for reduced cogging, resin-impregnated windings for enhanced reliability, and diamond-turned commutators for maximum brush life.

The motors are available in three lengths (1.798, 1.923, and 2.173 in.) and can provide continuous torque output up to 3.17 oz-in, peak torque up to 20 oz-in, and speeds up to 9,000 RPM.

An innovative cartridge brush assembly can serve to reduce audible and electrical noise and significantly improve brush life by maintaining optimum brush force throughout the life of the motor. Motor products can additionally be customized with optical encoders, custom cables, shaft modifications, shaft-mounted pulleys and gears, ball bearings, RFI suppression components, and other options to satisfy specific application requirements.

Click on the link below for additional information- 
http://www.servo2go.com/search.php?search=model 832&D=PROD

 For more information, please contact: 

EDITORIAL CONTACT:
Warren Osak        warren@servo2go.com 
Toll Free Phone:   877-378-0240
Toll Free Fax:       877-378-0249
www.servo2go.com

Lo-Cog Brush DC Gearmotors From Pittman January 5, 2011

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Greenville, DE —  PITTMAN Series GM8000 brush-commutated DC gearmotors from Servo2Go.com feature 11-slot skewed armatures to minimize magnetic cogging (or reluctance torque) and promote quiet and smooth operation.  

Pittman's GM8000 Series DC Servo Gearmotors

 

Series GM8000 gearmotors are available with a range of 11 standard reduction ratios from 6.3:1 to 187.7:1.  Peak torques up to 175 oz-in can be achieved with wide-face gear options. Armatures are skewed to minimize magnetic cogging, even at low speeds, and windings are resin-impregnated for greater reliability in incremental motion applications.  Two-pole permanent magnet stators are constructed of ceramic magnets enclosed in heavy-gauge steel return rings.  Diamond-turned commutators ensure maximum brush life.

GM8000 series gearmotors are available with and without encoder feedback, and are typically shipped in stock to 3 weeks.

Typical industry applications include data storage, medical/biotech, semiconductor, automation, commercial aviation, and others requiring high performance and reliability.

More information on the GM8000 series gearmotors from Servo2Go.com can be viewed at-

http://www.servo2go.com/search.php?search=GM8000&D=PROD 

For more information, please contact:

EDITORIAL CONTACT:

Warren Osak        warren@servo2go.com

Toll Free Phone:   877-378-0240

Toll Free Fax:       877-378-0249

www.servo2go.com

Lo-Cog Brush DC Gearmotors from Pittman December 6, 2010

Posted by Servo2Go.com in New Product Press Releases.
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Greenville, DE —  PITTMAN Series GM8000 brush-commutated DC gearmotors from Servo2Go.com feature 11-slot skewed armatures to minimize magnetic cogging (or reluctance torque) and promote quiet and smooth operation.  

Pittman's GM8724S015 DC Servo Gearmotor

Series GM8000 gearmotors are available with a range of 11 standard reduction ratios from 6.3:1 to 187.7:1.  Peak torques up to 175 oz-in can be achieved with wide-face gear options. Armatures are skewed to minimize magnetic cogging, even at low speeds, and windings are resin-impregnated for greater reliability in incremental motion applications.  Two-pole permanent magnet stators are constructed of ceramic magnets enclosed in heavy-gauge steel return rings.  Diamond-turned commutators ensure maximum brush life.

GM8000 series gearmotors are available with and without encoder feedback, and are typically shipped in stock to 3 weeks.

Typical industry applications include data storage, medical/biotech, semiconductor, automation, commercial aviation, and others requiring high performance and reliability.

More information on the GM8000 series gearmotors from Servo2Go.com can be viewed at-

http://www.servo2go.com/search.php?search=GM8000&D=PROD

An abridged copy of this Press Release can be viewed online at –

http://www.servo2go.com/news.php?id=53

For more information, please contact:

EDITORIAL CONTACT:

Warren Osak
warren@servo2go.com

Toll Free Phone:   877-378-0240

Toll Free Fax:       877-378-0249

www.servo2go.com