1 / 31

Motors

Motors. Discussion D10.2 Chapter 15. Hans Christian Oersted (1777 – 1851). X. 1822. In 1820 he showed that a current produces a magnetic field. Ref: http://chem.ch.huji.ac.il/~eugeniik/history/oersted.htm. André-Marie Ampère (1775 – 1836).

matt
Télécharger la présentation

Motors

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Motors Discussion D10.2 Chapter 15

  2. Hans Christian Oersted (1777 – 1851) X 1822 In 1820 he showed that a current produces a magnetic field. Ref: http://chem.ch.huji.ac.il/~eugeniik/history/oersted.htm

  3. André-Marie Ampère (1775 – 1836) French mathematics professor who only a week after learning of Oersted’s discoveries in Sept. 1820 demonstrated that parallel wires carrying currents attract and repel each other. attract A moving charge of 1 coulomb per second is a current of 1 ampere (amp). repel

  4. What do Maxwell’s Eqs. Predict? B = magnetic flux density (magnetic induction) m = magnetic permeability Magnetic field lines must be closed loops Force on moving charge q Lorentz force B

  5. Vector Multiplication Scalar (Dot) Product Vector (Cross) Product A A q q B B Direction of C given by "Right-hand rule" (into the screen)

  6. Force on current in a magnetic field Force on moving charge q -- Lorentz force Current density, j, is the amount of charge passing per unit area per unit time. N = number of charges, q, per unit volume moving with mean velocity, v. j Force per unit length on a wire is

  7. B Force out i + - i Force in X Rotating Machine

  8. X Rotating Machine B Force in i - + i Force out

  9. B Force out commutator i + - i brushes Force in X Rotating Machine

  10. What do Maxwell’s Eqs. Predict? Corresponds to Faraday’s law of electromagnetic induction A changing magnetic flux B density induces a curl of E

  11. Back emf X X B B Force out r i a q l + - b i Force in

  12. B Force out i + - i Force in X Back emf a b

  13. B Force out commutator i + - i brushes Force in X Back emf

  14. X X X X Armature with four coil loops S N

  15. Motor Circuit Power and Torque

  16. Armature Current, Speed, Power and Torque

  17. FF-130 Series Motors

  18. Maximum Power

  19. Generator Circuit

  20. Motor Driver Circuit

  21. MOS FET Relays G3VM-61B1

  22. Pulse-Width Modulation

  23. pwm.v module pwm(clk,clr,duty,pwm); input clk; input clr; input [3:0] duty; output pwm; reg [3:0] count; reg pwm; wire set, reset; // 4-bit counter always @(posedge clk or posedge clr) if(clr == 1) count <= 0; else count <= count + 1;

  24. pwm.v assign set = ~| count; assign reset = (count == duty); always @(posedge clk) begin if(set == 1) pwm <= 1; if(reset == 1) pwm <= 0; end endmodule

  25. Lab 11

  26. Lab 11

More Related