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Actuator Report: Stepper Motor

Actuator Report: Stepper Motor. Utah State University. March 11 , 2010. Steve Gunderson chapodecalifornia@hotmail.com (916) 662-4244. Acknowledgements. Dr. YangQuan Chen : Research background and technical instruction. Overview Impact of engineering Principle of operation Types

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Actuator Report: Stepper Motor

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  1. Actuator Report: Stepper Motor Utah State University March 11, 2010 Steve Gunderson chapodecalifornia@hotmail.com (916) 662-4244

  2. Acknowledgements • Dr. YangQuan Chen: Research background and technical instruction

  3. Overview Impact of engineering Principle of operation Types Implementation Application Major specifications Limitations Purchasing References Agenda Typical Stepper Motor http://en.wikipedia.org/wiki/Stepper_motor

  4. Stepper motors are brushless electric motors that operate through a radial array of steps The step sizes vary from motor to motor and can be used in control applications where a defined resolution is helpful with motor manipulation Overview

  5. Stepper motors have become widely implemented in many ways due to their controllability without any form of feedback loop Even without feedback, a stepper motor may be controlled to a good degree of precision Overview

  6. The functionality of stepper motors has been so widely accepted that they have revolutionized the usefulness and ease of implementation of electric motors They can be used in stable and reliable control system that function with great precision and accuracy Impact of Engineering

  7. Voltage applied to the motor causes the rotor to incrementally spin More voltage causes more increments to be bypassed around the circle Principle of Operation Typical Stepper Motor http://en.wikipedia.org/wiki/Stepper_motor

  8. Permanent Magnet stepper motors maintain a permanent magnet within the housing Variable Reluctance stepper motors with iron rotors have rotor points attracted to stator magnet poles Hybrid Synchronous stepper motors are the combination of the previous two for better performance Types

  9. Stepper motor control varies almost as widely as the stepper motors themselves Control implementation is heavily dependent upon internal configuration and application needs Implementation Stepper Motor Control http://www.tigoe.net/pcomp/code/category/arduinowiring/51

  10. Drive circuitry for bi-polar stepper motors can be complicated but may be worth the additional torque that the actuator would be able to provide once configured properly Implementation Stepper Motor Control http://www.tigoe.net/pcomp/code/category/arduinowiring/51

  11. Half-stepping and micro-stepping are two implementation modes where the angular resolution may be increased with little change to the control circuitry Implementation Stepper Motor Control http://www.tigoe.net/pcomp/code/category/arduinowiring/51

  12. Countless types of stepper motor configurations are in use today all throughout the world A wide variety of markets can take advantage of them for precise control actuation Application

  13. Smaller high precision stepper motors are often used for common actuation tasks Their small enclosures are easy to mount to hardware and at low speeds can provide high torque Application Stepper Motors http://news.thomasnet.com/IMT/archives/2006/07/scavenge_materials_to_build_tinker_your_own_cnc_machine.html

  14. Robotic systems can take advantage of a stepper motor’s quick response and high precision without the constant need of a feedback loop Where needed they can also interface with belts and drive trains Application Stepper Motor http://www.designworldonline.com/uploads/ImageGallery/G4.Handler.stepper.motor.gif

  15. Motors tend to vary widely in response and must be characterized in order to properly control and implement them in a design Stepper motor characteristic equations are a good start to understanding their behavior, as long as the control circuitry is also taken into account Major Specifications

  16. Stepper motor resolution is completely dependent upon the number of teeth on the rotor As motor velocity increases, there is also a marked decrease in the total torque output which can comprise certain implementations of the actuator Limitations

  17. Different tooth constructions in the motors can lead to varied efficiencies and controllability More complicated motor designs also may require more complicated control electronics with amplifiers and many input lines Limitations

  18. Stepper motors may be readily purchased from many online retailers Small electronic stepper motors are found at digikey.com or mouser.com Large-application stepper motors may be obtained from specialty manufacturers and retailers Purchasing

  19. Wikipedia.org “Mechatronics – An Integrated Approach” by Clarence W. de Silva References

  20. Questions?

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