Posts Tagged 'Servo Motor'

High Efficiency Motors

Reprint of maxon motor USA October 14, 2014 white paper

To understand the concept of high efficiency motors, you must first know how to calculate efficiency and the losses associated with the motor components themselves.

The final measured efficiency of a motor is calculated based only on the elements of the particular application they’re used in.  For the motors themselves, without a load, manufacturers provide ratings based on standard formulas.  To understand high efficiency motors you only need to know what makes them different.

Cutaway of a maxon brush servo motor

Cutaway of a maxon brush servo motor

But first, let’s look at the basic concept used for explaining motor efficiency, which says that efficiency is the ratio between the shaft output power and the electrical input power.  Shaft output can be measured in horsepower or watts. We’ll use watts for the purposes of this article.  The formula most often used is the simple one mentioned above:

ηm = Pout / Pin

where

ηm = motor efficiency
Pout = shaft power out (Watts)
Pin = electric power to the motor (Watts)

Once you’ve used this formula and found your efficiency – and it’s not 100 percent – it’s time to consider the losses that occurred inside the motor.  Motor efficiency drops based on a number of known factors where power is lost as current through the motor is met with a variety of resistances.  These losses can include the wiring and its resistance, iron losses due to magnetic events, and thermal losses.

The electrical power that is lost in the primary rotor and in the secondary stator windings are called resistance losses (or copper losses, because they are based on the characteristics of the wire used including its diameter and length).  Both primary and secondary resistance losses vary with the load in proportion to the current squared. For example:

Pcl = R I2

where

Pcl = stator winding, copper loss (W)
R = resistance (Ω)
I = current (Amp)

Other losses include, iron losses, as mentioned above.  These losses are the result of the amount of magnetic energy dissipated when the motor’s magnetic field is applied to the stator core.  Other factors involved include mechanical losses, which involve the friction in the motor bearings and stray losses, which are basically any remaining losses that are left after the resistance, iron, and mechanical losses are calculated.

The largest culprit for stray losses are the result of harmonic energies that are generated when the motor operates under load.  The load affects the shaft power output, which is why it’s impossible to discuss in a general article such as this.  But basically, these losses are dissipated as currents in the windings, harmonic flux components in the iron parts, and leakage in the laminate core.

High Efficiency Motors

The maxon high efficiency motors get their name because they provide efficiencies in the 90 percentiles as opposed to the 50 to 60 percent range for most motors in their class.

The key to high-efficiency for maxon lies in the fact that they have no iron losses. maxon manufactures ironless core or coreless motors designed to the needs of their customers.  This means that the losses associated with the iron components have been eliminated.  By designing coreless and ironless core motors, maxon also eliminated the largest concentration of stray losses associated with motors, which are losses associated with leakage in the laminate core.

maxon incorporates the use of permanent magnets in their motors.  The ironless core brush motors have a permanent magnet, then a rotating winding, and then the housing, which closes the magnetic path.  With this configuration, there is no electricity going through the core of the motor (through the iron parts) to create a magnetic resonance.

The benefits of the ironless winding provides very specific advantages, which include: there is no magnetic detent and there are minimal electromagnetic interferences.  Part of the efficiency, though, is dictated by the type of magnet used in the design.  For example, the stronger magnets, such as NdFe will offer higher efficiencies.  Add to this, the fact that maxon includes graphite brushes and ball bearings in their brushed motors, customers gain long service life as well as high efficiency.

Click on the link below to view the Maxon Motor Product Family.

http://www.electromate.com/products/?partner=1072297493

EDITORIAL CONTACT:
Warren Osak
sales@electromate.com
Toll Free Phone:   877-737-8698
Toll Free Fax:       877-737-8699
www.electromate.com

 

Tags:  high efficiency motor, servo motor, BLDC motor, maxon, maxon motor, Electromate, brush servo motor

Brushless servo motors – more control for valves with linear actuators

Reprint of blog posted by Ryan Klemetson of Tolomatic on Tue, Mar 24, 2015 @ 08:03 AM

Many process industry control engineers are looking to more sophisticated motion control solutions for valve automation. That’s because there’s an ever-growing need to improve productivity, increase efficiency and minimize downtime. It’s essential that engineers be able to control the valves that regulate the flow of materials throughout a facility. Continue reading ‘Brushless servo motors – more control for valves with linear actuators’

Motors deliver higher power density for compact robots

Kuka’s compact robots in the KR Agilus series are precise, agile and fast.  As agile systems, these five-axis and six-axis handling units feature short cycle times and high repeatability, particularly for pick-and-place tasks.

Synchronous servomotors from Kollmorgen’s AKM series play a major role in achieving this precision. Using collaborative co-engineering, the two companies reduced the installation volume of the motors compared to standard models.  The performance of the robots within their rated load range sets new standards for speed, cycle times and energy supply.  They can even handle unusual tasks in base and cover installation positions. Kollmorgen developed the custom motors by adapting motors from the standard AKM servomotor series.

As fast all-rounders, the robots are suitable for general industrial applications.  With a dead weight of 51 kg, the basic model can support loads up to 6 kg.  The compact robots are suitable for process automation in the packaging, electronics, food and pharmaceutical industries.

“We made a significant contribution to short cycle times and high precision by adapting our servomotors from the AKM series to Kuka’s specific needs,” said Theo Loy, sales manager at Kollmorgen.

The co-engineering partner adapted the design of the synchronous servomotors to make them fit perfectly in the joints of the robots.  That also enabled the engineers to increase the already high power density.

The objective was to find ways to implement custom performance improvements and structural assembly adaptations without sacrificing the advantages of industrial series production.  The aim was to optimize standard motors by making controlled modifications.  With custom adaptations, such as cable strain reliefs, modified bearing shells, Kuka-specific connector configurations or special drilled holes in the output shaft, the motor manufacturer could reliably maintain the majority of its standardization.  But is that still possible when the entire design geometry is fundamentally changed?

Using the smallest servomotor in the AKM series, it had to be made even thinner to fit compactly into the wrist joint of the robot.  The co-engineering process started off with 3D models and outside contours, and in the end it involved working with detailed design data.

To make things easier for the customer in the Kuka project, Kollmorgen also incorporated the engineering expertise of its own suppliers, such as a specially adapted motor brake.

“It acts as both a holding brake and an emergency brake,” said Loy. The KR Agilus is the only robot in its class that features Kuka’s Safe Operation function, which drastically simplifies human-robot interaction.

The AKM series of high-acceleration, permanent-magnet servomotors are available in 28 housing and mounting combinations.  They also feature reduced energy consumption, high control accuracy and high availability, and they are compatible with all commonly used supply voltages thanks to specifically adapted stator windings.

Information on the AKM Brushless Servo Motors can be viewed at the following webpage-

AKM Series Product Information

For more information, please contact:

EDITORIAL CONTACT:
Warren Osak
sales@electromate.com
Toll Free Phone:   877-737-8698
Toll Free Fax:       877-737-8699
www.electromate.com

 

Tags:  Kollmorgen, AKM, Servo Motor, BLDC Motor, Electromate, AKM Servomotor

maxon motors for Space Applications

Check out this new video from maxon motor UK on how Oxford Space Systems are incorporating maxon motor products in their deployable structures for the space industry.

[click on the video image above to launch the video]

Click on the link below to view the Maxon Motor Product Family.

http://www.electromate.com/products/?partner=1072297493

EDITORIAL CONTACT:
Warren Osak
sales@electromate.com
Toll Free Phone:   877-737-8698
Toll Free Fax:       877-737-8699
www.electromate.com

 

Tags:  maxon, maxon motor, maxon DC motor, Electromate, servo motor, BLDC motor, brushless motor, flat motor, pancake motor, automation, electric motor, motion control, motor winding selection

 

On Demand Webinar- DC Motor Types and Usage in Typical Applications

Selecting DC Motors Webinar

Live Webinar: DC Motor Types and Usage in Typical Applications

February 03, 2015  11:00am EST

This webinar gives you guidelines for selecting the perfect DC motor type for your application.  For example, which motor type is used in the climate control system of the Boeing Dreamliner, and for what reasons?

  • Is a brushed or a brushless design more adapted?
  • Does a flat pancake type motor fit better or should it be an elongated cylindrical one?
  • Are motors with a slotted iron core winding design the right choice, or should it be a motor with a slotless winding?

For motor selection, it is important to know the particular requirements of each application.

  • How large are torque and speed?  Are there any gears involved?
  • How is the motor operated and controlled?  What is the required precision of control?
  • What are the restrictions on size and weight?
  • How about special ambient conditions such as temperature and pressure?

Before answering these questions, the webinar starts with having a look at the properties of all kind of small DC motors with permanent magnets.

  • Which motor designs are adapted for high speed or high torque?
  • How to select motors according to torque and speed requirements
  • What are the particular advantages of brushed or brushless motors?
  • How does a slotted or slotless winding design influence motor performance?
  • What is the role of gears?

The webinar illustrates the findings on a multitude of typical application examples.
Presenter: Dr. Urs Kafader – Maxon Motor

Click on the link below to register for this Free Webinar-

https://attendee.gotowebinar.com/register/8941133262759890177

 

Tags:  Electromate, maxon, maxon motor, servo motor, slotted motor, slottless motor, DC motor, motor selection, iron core motor, coreless motor, BLDC motor, webinar, flat motor, pancake motor

Applimotion’s LARC Motors for Large Diameter Direct Drive projects

Applimotion routinely scales its LARC motors (Linear Arc) for large diameter applications greater than 1 meter diameter. The modular nature of these motors allows them to integrate with large assemblies for scanning, imaging, and metrology applications where size requirements take priority over high torque requirements.

Applimotion LARC Motor

Applimotion LARC Motor

LARC motors come in modular pieces and will bolt into any large diameter servo motor application. The motors operate from standard brushless motor amplifiers from 24 to 300 volts. They work nicely with encoders, resolvers, or the recently introduce magnetic encoders for direct drive applications.

The LARC motors also offer very low profile design to fit into tight spaces where traditional motors have limitations. Applimotion also offers hermetically sealed magnet tracks and coil assemblies for vacuum or special environments.

For more information, click on the link below-

http://www.electromate.com/pdf_lib/Applimotion/Applimotion_Linear_ARC_motors_Datasheet.pdf


EDITORIAL CONTACT:
Warren Osak
sales@electromate.com
Toll Free Phone:   877-737-8698
Toll Free Fax:       877-737-8699
www.electromate.com

Tags:  Applimotion, BLDC Motor, Brushless DC Motor, brushless dc motors, Brushless Motor, DC Motor, Direct Drive Motor, Electric Motor, Electromate, Frameless Motor, Motion Control, Servo Motor, Slotless Motor, LARC Motor, Linear Arc Motor


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