The document discusses different types of electric motors including DC motors, AC motors, and stepper motors. It provides details on the fundamental characteristics, construction, and applications of series, shunt, and permanent magnet DC motors as well as single phase, three phase, and stepper AC motors. The document also covers modeling and control methods for DC and AC motors including H-bridge control and variable frequency drives.

3. Fundamental characteristics of DC Motors End view Time 0 End view Time 0+ Shifting magnetic field in rotor causes rotor to be forced to turn

5. DC motor wiring topologies

9. Permanent magnet DC motors

12. DC Motor modeling Motor equations From the circuit Substituting the above: For stalled rotor torque And no-load speed In terms of no-load speed torque/speed equation is: Power is: Max power is: Units:

23. Squirrel Cage Rotor Seimens AG, 2002

25. Torque/speed curve

26. Typical starting current

28. NEMA Torque characteristics summarized High Punch Press High ------- Low Very high D Loaded compressor Loaded conveyor Normal Low Normal High C Same as Design "A" Normal Normal Normal Normal B Mach. Tools, Fans Low High High Normal A TYPICAL APPLICATIONS FULL LOAD SLIP BREAK- DOWN TORQUE STARTING CURRENT STARTING TORQUE NEMA DESIGN

29. NEMA Motor Characteristics High Low Med Med-High Med-High Efficiency 0.5-3 800-1000 160-200 60-140 74-190 E 5-8 600-700 275 NA 275 D 1-5 600-700 190-225 140-195 200-285 C 0.5-5 600-700 175-300 65-190 70-275 B (most common) 0.5-5 NA 175-300 65-190 70-275 A Slip % Locked Rotor Current % FL Breakdown Torque % FL Pull-up Torque % FL Locked Rotor Torque % FL Design