Motor starting study
Motor starting study
(OP)
Can anyone please point me to a guide on how to perform a motor starting study? I know it involves voltage drops in cables, starting curves, etc., but I don't know anything about the details.
Websites or books would be helpful.
Websites or books would be helpful.





RE: Motor starting study
Starting form square one in an ANSI purview, you might obtain IEEE Std 399-1997, “Brown Book” and possibly IEEE Std 141-1993, “Red Book”. shop.ieee.org
RE: Motor starting study
a. - Load speed-torque curve and reflected constant of inertia at the motor shaft.
b. - Motor speed- torque curve, speed-current curve and motor current-time thermal withstand.
c. - Type of start configuration. (Reduced voltage, part-winding, wye-delta, soft starter, etc).
d. - Load conditions; (uncoupled, reduced load, etc).
e. - Power supply parameters and voltage drop due to current demand at motor start.
f. - Calculation of motor starting time. Based on the speed- torque curves, system inertia and voltage-frequency applied.
g. - Analysis of the line and motor heating and current relays coordination based on starting time, motor current and heating curves.
h. - Verify allowed number of starts.
RE: Motor starting study
For an in-depth starting analysis, SKM software is good, but very expensive, usually out of reach of an occassional user but a usefull tool for consulting engineers. Several control manufacturers own it and will perform an analysis when you are seriously considering using their equipment. www.skm.com/ns/products/tms.htm
"Venditori de oleum-vipera non vigere excordis populi"
RE: Motor starting study
TTFN
_______________________________________
Regards -
Colin J Flatters
Consulting Engineer & Project Manager
RE: Motor starting study
http:///www.sumatron.com
for Power Engineering EE Helper
RE: Motor starting study
It really depends on why you are doing the motor starting study.
Incorrect motor study has two major effects:
1) excessive disturbance on the electrical supply
2) excessive wear and tear on the mechanical equipment.
You need to determine what you are trying to improve and then base your study on that. In many cases, the client is interested in a reduction in maintenance, and that can be both electrical and mechanical.
Best regards,
Mark Empson
http://www.lmphotonics.com
RE: Motor starting study
Thanks.
RE: Motor starting study
http://www.esmagazine.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2503,9002,00.html
http://www.esmagazine.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2503,13289,00.html
http://www.emersonmotors.com/jsp/basics/default.jsp
http://www.leeson.com/products/techref/
etc.