Inductive Motors Tanner Cox

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Inductive MotorsTanner Cox

• ECE 5320 Mechatronics Assignment 1

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Outline

1. Basic Working Principle
2. Typical Sample Configuration
3. Advantages Disadvantages
4. Major Specifications
5. Limitations
6. Other
7. How to choose
8. Cost information
9. Where to buy
10. To Explore Further
11. References

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Induction Motor Basics(Sample Configuration)

• A rotating magnetic field is generated by the set
  of windings pictured in Red, Yellow, and Blue on
  the right.

Figure 1 Three-phase rotating field induction
motor
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Induction Motor Basics

•  

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Induction Motor Basics

• More phases can be added to the system to
  increase efficiency and motor power.
• However, as more phases are added, the magnetic
  field rotates at an increasing lower speed. This
  can be seen from the equation on the previous
  slide.

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Induction Motor Basics

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Major Applications

• Household appliances
• Washer and Dryer
• Fans
• Refrigerator
• Elevators
• Water Pumps
• Many others

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Advantages of AC Induction Motors

• Cost Effectiveness
• Robustness
• Simple Construction
• Easy Maintenance
• Use of convenient power source
• No commutator and brush
• Low Power Dissapation
• No electric spark(less hazardous)

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Disadvantages of AC Induction Motors

• Low starting torque
• Need of auxiliary starting devices
• Difficult variable-speed control

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Major specifications - OMAT13-18-56CB

• Price - 115.00
• Rolled Steel AC Motors 0.33 to 2 HP
• 208 to 230/460 Volt, Three-Phase
• TEFC (Totally Enclosed Fan Cooled)
• Class F Insulation
• Premium-Grade Quality
• Inverter-Duty Capable
• Variable Torque 51 Speed
• Constant Torque 21 Speed
• Electrically reversible
• Heavy gauge bolt-on, bolt-off NEMA 56-frame
  removable base
• Motor slide base for adjustable mounting

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How to Choose?

• Horsepower range How much power do you need to
  get from your motor?
• Base speed How fast do you need your motor to
  spin?
• Standard Voltage/Efficiency What power source
  is available? Is energy efficiency important for
  your application
• Insulation If the motor heats up will it cause
  any problems?
• Budget How much money do you have to spend?

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Cost Information

• The following website is an example of how much
  an induction motor will cost, 100-200 from this
  specific website. More efficient motors with
  more power will cost more.
• http//www.automationdirect.com/adc/Overview/Catal
  og/Motors/AC_Motors_-_General_Purpose_and_Inverter
  _Duty_(0.25_-_300HP)/AC_Motors_-_General_Purpose,_
  Cast_Iron,_Ironhorse_(0.33_-_300HP)

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Where to buy?

• They are built into many household devices
• Automationdirect.com and Omega.com both sell
  small and large AC induction motors of all
  varieties

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To Explore Further

• How many phases are optimum in an inductive
  motor?

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References

• Figure 1. Rotating Field Reprinted from
  Induction motor, by Wikipedia, October 2010,
  lthttp//en.wikipedia.org/wiki/Induction_motorgt
• De Silva, Clarence W. Mechatronics A Foundation
  Course. Boca Raton Taylor and Francis Group LLC,
  2010.
• Omega.com. 2012. Omega Engineering, Inc. March
  19, 2012. lthttp//www.omega.com/ppt/pptsc.asp?ref
  OMAT_Seriesgt