Posts Tagged 'Flat Motor'

Service robots use flat motors

maxon

Service robots for the disabled must be reliable, safe and easy to use.  The right motion system components are essential for these highly specific applications.

Unlike industrial robots for manufacturing, service robots come with their own specification requirements aimed specifically at the end user, and the most discriminating user at that—a human being.  That’s why designing and manufacturing service robots takes a particular set of skills and engineering expertise.  For example, when Canada-based Kinova Robotics creates designs for this market, the design team brings years of experience in the field.  And although they’ve modified the robots over the years, as new products and systems become readily available, they can produce higher quality and more useable products.  Using the latest technologies allows the designers to continue to advance offerings to the public.

The company’s Jaco2 Robotic Arm provides a lightweight, quiet and easily controlled device to the service industry.  The robotic arm moves around 6° of freedom through the use of six flat motors designed and manufactured by maxon precision motors.

The arm was designed using six joints from a shoulder-type joint through to a functional wrist joint.  The robot can manipulate a maximum payload of 1.5 kg at full extension, as well as a 2.5 kg payload at a mid-range extension.  Both of these payloads are adequate for the needs of most disabled people in the process of living a normal life.  The robotic arm device itself weighs only 5.3 kg, which was an important specification for it to mount to a wheelchair without tipping it over.

Because the first three joints must handle the highest torque for movement of the extended arm as well as for lifting items a user needs, the design team chose to use maxon’s EC 45 flat brushless dc motors.  These motors deliver a maximum continuous torque to 134 mNm (19 oz-in.) in a small, compact 70 W package. And since the Jaco2 needed to fit inside the robotic arm itself, there had to be less heat generated through motor operation—a huge benefit of the flat motors.  Although the motors can operate at very high speeds, that was not a necessary requirement for the application.  For the robotic arm to be manipulated efficiently, the device only needed to move at a speed of 20 cm per second, which translates to about 8 rpm maximum for the actuators’ outputs (about 1100 rpm for the motors).

The second three joints in the Jaco2 arm are also EC 45 flat motors, but are 30 W versions.  Again, they were chosen to help keep heat dissipation at a minimum, since the motors were mounted inside the arm itself.  Further, the flat motors were necessary because of the compact space allocated to the robot joints. The motor efficiencies were a critical point in selecting the EC series for the application.  Plus, according to one member of the engineering team, maxon was open to slight customizations, which allowed the team to fit the motors to the application perfectly.  Through the use of slip rings that were designed and manufactured in-house, each axis on the arm has infinite rotational capability.

Gearing for the arm incorporates harmonic drives translating to a 1:136 ratio for the large actuators in joints one and three, a 1:160 ratio for the large actuator in joint two, and 1:110 ratio for the small actuators located in joints four, five and six.

maxon2

The Jaco2 Service Robot uses three EC 32, 15 W motors to operate the finger of the robot.  Kinova engineers provided an in-house design for the lead screw mechanisms incorporated inside the fingers. The linear actuators had to be small due to the limited space available.  The actuators were designed in-house because the company’s engineering team found that it was less expensive to design the lead screws they needed than to buy them off the shelf from another vendor.  Although the flat motors have some minor degree of cogging, that did not affect the accuracy or other operations of the robot that would be critical to the user.  Quiet operation of the motors only added to their overall appeal for the application, especially because of the human-robot interaction. The company wanted the device to be as transparent as possible to a user.

All the motors in the arm are daisy chained using a single cable that runs through the system.  The tight form factor dictated the size and type of motor the design team could use.  The Jaco2 uses 18 to 29 Vdc for operation at 25 W nominal power (100 W peak power).  Control of the arm is performed through an RS485 (internal) and CANBUS (external) protocol. The system comes with two expansion card connectors for future use.

The controller features redundant security on each actuator/finger, redundant error check in actuators and control system, position and error calculation performed every 0.01 seconds, Cartesian and angular trajectory control, and force and torque control options.

maxon3

Each Jaco2 Robotic arm is controlled easily through the user’s wheelchair control or through a user friendly joystick, which provides the precision necessary for the human-robot interaction needed for the disabled person.  All the software required for the system was written by the Kinova Robotics engineering team so that the operation of the Jaco2 met all their in-house specifications and goals.  The software runs on Windows, Linux Ubuntu and ROS, and was written using C# and C++.

maxon precision motors, inc.
www.maxonmotorusa.com

Tags:  Maxon, Maxon Motor, flat motor, pancake motor, service robot, Kinova, Jaco, Jaco Arm, BLDC motor, Kinova Robotics

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

 

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

How to select the optimum motor winding. A new 6min video from maxon motor ag

 

This 6minute video, by Dr. Urs Kafader of maxon motor ag, illustrates the properties of a DC servo motor winding for a given motor type.

Click on the link below to view the YouTube 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

DC motor winding selection. A new 6min video from maxon motor ag

A new 6 minute YouTube video from maxon motor ag

This video, by Dr. Urs Kafader of maxon motor ag, illustrates the selection of a DC servo motor winding for a given maxon motor type.

Click on the link below to view the YouTube Video.

https://www.youtube.com/watch?v=jvwiukrun3Y&list=TLYOK7sB2OyH0&index=4

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

 

Brushed vs Brushless DC motors. What you need to know

Brushed vs Brushless DC motors.   What you need to know.

A new 6 minute YouTube video from maxon motors ag

Click on the link below to view the YouTube Video.

https://www.youtube.com/watch?v=jvwiukrun3Y&list=TLYOK7sB2OyH0&index=4

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

A Comparison of DC Linear Actuators with DC Linear Motors

New article from maxon motors

Factory automation and robotic application engineers are often faced with the challenge of requiring fast, accurate and powerful linear actuation within a small allocated volume.  The two most commonly available technologies are rotary DC motor driven actuators and linear DC motor actuators.  This article provides details on the advantages and disadvantages with all technologies. 

Click on the link below to download the article.

http://www.electromate.com/db_support/downloads/Maxon-DC-actuators-vs-DC-motors.pdf

 

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

 

 


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