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Electromagnetic Actuator-Solinoid

Electromagnetic Actuator-Solinoid. Noah A. Sundberg ECE 5320 Mechatronics Assignment #1. Outline. Resources Related Web Pages Introduction Major applications Specific applications and uses How it works Principles Behind Solenoids Example 1 Specifications Selecting a Solenoid

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Electromagnetic Actuator-Solinoid

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  1. Electromagnetic Actuator-Solinoid Noah A. Sundberg ECE 5320 Mechatronics Assignment #1

  2. Outline • Resources • Related Web Pages • Introduction • Major applications • Specific applications and uses • How it works • Principles Behind Solenoids • Example 1 • Specifications • Selecting a Solenoid • Limitations

  3. Resources • Mechatronics Handbook, Robert H. Bishop, CRS Press • Integrated Publishing www.tpub.com/content/doe/h1013v2/css/h1013v2_166.htm

  4. Related Web Pages • How Stuff works • science.howstuffworks.com/electromagnet3.htm • Integrated publishing • www.tpub.com/content/doe/h1013v2/css/h1013v2_166.htm • Jewel Instruments • www.wpiinstruments.com/solenoids/theory.htm

  5. Introduction A solinoid is the most common type of electromagnetic acutuators. A solinoid consists of an Iron core surrounded by coiled wire. When the coils have current flowing through them they create a magnetic field that pushes or pulls on the iron core depending on what direction the current is flowing.

  6. Major Applications Solenoids are used in • Valves • Water valves • Gas valves • Relays • Power relays • Switches

  7. Specific applications and uses • Automatic Door locks • Office Equipment/ Printers • Electric/ Electronic Locks • Photographic/ Optical • Medical Instrumentation • Coin and Bill Changers • Cash Drawers and Automatic Teller Machines

  8. How it works Principles Behind Solenoids -Lorentz’s law of electro magnetic induction states that a magnetic flux (theta) exists due to a magnetic field The fields strength is H and the flux density is B and are related by the magnetic permeability of the substance that the field is in.

  9. How it works (continued) Principles Behind Solenoids-Continued -Faraday’s Law of Electromagnetic Induction states that a change in the electromotive force (emf) or Voltage across the conductor causes a change in the flux. There for current creates magnetic flux as is shown in fig 1(Mechatronics Handbook) Fig 1

  10. How it works (continued) Principles Behind Solenoids-Continued -As shown in figure 3 and 4 (found in the Mechatronics Handbook) in a solenoid utilizes these characteristics to cause a B field in one direction The strength of the field depends on the length of the solenoid (L) the number of turns (N) the magnetic permeability u and the current i Fig 3 Fig 4

  11. How it works (continued) Example 1 –Valve A spring maintains the valve in its closed or open position. When a current is produced the coils around the core Produce a magnetic force That pushes the valve to the Open or closed position When the current is stopped The force is removed and The valve moves to its original Position. The set up of this Can be seen in figure 1(from www.tpub.com/ content/doe/h1013v2/ css/h1013v2_166.htm) Fig. 2

  12. Specifications • current driving solenoid • Initially open or closed • DC or AC • Number of Turns • Voltage maintaining the core in position

  13. Selecting a Solenoid Many mechanical, thermal, and electrical constraints should be considered when selecting a solenoid. • Force requirements • Electrical requirements (current driving actuator etc.) • Duty cycle • Maximum envelope dimensions • Temperature extremes • Termination requirements • Dimensions

  14. Limitations • Current flowing through coil • Dimension • Voltage across the coil • Distance the armature needs to move

  15. Where to Buy • WellGrow industries Corp. www.fittings.com.tw • Command Alarms www.commandocaralarms.com/solenoids_actuators.asp • Saia Burgess www.ledex.com/df/LXGOG/index.html • Alltronics.com www.alltronics.com/relays.htm • Penn+Giles www.pennyandgiles.com/products/products.asp?strAreaNo=402_12 • Corrosion Fluid Products Corp. www.corrosionfluid.com/Products/valves/actuators.htm

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