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Motor Control ch 1

Introduction to Magnetic Motor Control

QuestionAnswer
1.Two natural energy sources are ___ and ___. wind and water
2. Sources of energy which drive machines are identified as _____ movers. prime
3. Which of the following electrical industry pioneers invented the first practical AC motor? Nikola Tesla
4.A motor controller is a device that governs the performance of an electric motor in a ____. predefined manner
5. According to a 1998 Department of Energy survey, what percentage of electricity used in the US was used to drive electric motors? 63%
6. Which of the following organizations are identified in the text as standards-setting organizations for motor control devices? IEC AND NEMA
7.List the nine items normally found in a NEMA Standard. scope, definitions, rating, manufacturing, dimensions, performance, testing, marking, application
8. Which item, included in a NEMA Standard, would indicate procedures to determine if a motor control component was in compliance with manufacturing ratings? testing
9. Which standards organization discussed in the text is associated with the International Organization for Standardization(ISO)? IEC
10. As a standards organization, what four groups of users does NEMA produce publications for? installers, contractors, inspectors, MRO
11. What does the term SI stand for, and which organization was instrumental in the development of this standard? international system of units, IEC
12. As a standards organization, what five document formats are used with the IEC standards? page 7 International Standards (IS), Technical Specifications (TS), Technical Reports (TR), Industry Technical Agreement, Publicly Available Specifications, and Guides
13. Devices built according to the ___ standard have a smaller footprint. page 9 IEC
14. Devices built according to the ____ standard have four times longer life expectancy NEMA
15. NEMA AC motors are designed for ___ hertz power. 60
16. Which standard's devices are generally considered application specific? IEC
17. Which component standard rates motor controllers in HP? NEMA
18. Which standard's devices are typically larger and costly? NEMA
19. Is it possible to have motor control devices which meet both standards? yes page 8
20. Which standard's devices are designed for time delay fuses and circuit breakers? NEMA
Study page 9. Next 9 cards name the NEMA first and IEC second next 9 cards name the NEMA first and IEC second
Parameters: NEMA IEC English vs. Metric
Degrees of ingress protection NEMA type sets standard vs. IP code sets standard
Size Larger footprint vs. smaller footprint
Performance Life as much as 4 times higher vs. Life of 1,000,000 operations is typical
Application areas fewer application specific parameters vs. more application sensitivity
Cost higher vs. lower
Motors English units, horsepower, 60 hertz,speed, voltage rating,terminal box location, duty cycle, and temperature classes. vs Metric, Kilowatts, speed, 50 hertz, voltage rating, terminal box location, duty cycle, and temperature classes.
Motor controls standard sizes, horsepower, mounting not standard, limited terminal markings. vs no size standards, rated in Utilization Category, mounting standard in some categories complete terminal identification
pilot lamps and switches NEMA type enclosure rating, similar electrical performance, panel opening 3 sizes, and no styling standard vs. IP code enclosure rating, similar electrical performance, panel opening not in standard, and no styling standard
Other areas typical hand reset only mechanism, designed for time delay fuses and circuit breakers vs. typical hand or auto-reset or stop mechanism, designed for fast-acting,current-limiting European fuses.
Created by: JoshHampton
 

 



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