Different types of electric motors

[Capstone]

I have to write a report about one of three motors AC type Motors, DC type Motors, Stepper Motors. I am wanting to now if anyone has any insight into which one I should talk about, which one has the most information and would be easiest to write a report on. Thanks

 

[hutchphd]

For what course and grade level?

 

[Capstone]

Electrical engineering degree level

 

[DaveE]

If you want easy, then choose one of the DC, BLDC, Step motors; something with a permanent magnet. They are all closely related, IMO.

 

[Capstone]

Thanks a lot

 

[hutchphd]

I agree with @DaveE assessment. Also the advent of rare Earth magnets make the three phase DC motor ubiquitous.
If you wanted to go historic you could (carefully) look at Nicola Tesla's contribution to AC motors. A bit of a minefield of course.

 

[anorlunda]

To be completely modern, the AC reluctance motor stands on the brink of replacing induction motors. No rotor I2R losses, no permanent magnets, no rotor electromagnets.

 

[Capstone]

Thanks

 

[Capstone]

Anyone know of any reliable articles or textbooks that I can use to gather information?

 

[berkeman]

Anyone know of any reliable articles or textbooks that I can use to gather information?

You could start with the Wikipedia article (which is quite long and full of information), and then follow some of the references to the motor types that you find most interesting:

https://en.wikipedia.org/wiki/Electric_motor

Contents

• 1 History
  • 1.1 Early motors
  • 1.2 DC motors
  • 1.3 AC motors
• 2 Components
  • 2.1 Rotor
  • 2.2 Bearings
  • 2.3 Stator
  • 2.4 Air gap
  • 2.5 Windings
  • 2.6 Commutator
• 3 Motor supply and control
  • 3.1 Motor supply
  • 3.2 Motor control
• 4 Major categories
• 5 Self-commutated motor
  • 5.1 Brushed DC motor
  • 5.2 Electronic commutator (EC) motor
  • 5.3 Universal AC/DC motor
• 6 Externally commutated AC machine
  • 6.1 Induction motor
  • 6.2 Synchronous motor
  • 6.3 Doubly-fed electric machine
• 7 Special magnetic motors
  • 7.1 Rotary
  • 7.2 Linear motor
• 8 Comparison by major categories
• 9 Electromagnetism
  • 9.1 Force and torque
  • 9.2 Power
  • 9.3 Back emf
  • 9.4 Losses
  • 9.5 Efficiency
  • 9.6 Goodness factor
• 10 Performance parameters
  • 10.1 Torque capability of motor types
  • 10.2 Continuous torque density
  • 10.3 Continuous power density
• 11 Acoustic noise and vibrations
• 12 Standards
• 13 Non-magnetic motors
• 14 See also
• 15 Notes
• 16 References
• 17 Bibliography
• 18 Further reading
• 19 External links

 

[Capstone]

Thanks

 

[Capstone]

Does anyone know why AC motors usually do not operate at speeds under 1/3 of base speed and the reason for this?

 

[Merlin3189]

Yes.