It is a fact that The National Electrical Code, as well as the international standards establishes the general characteristics and specifications to be done at the time of developing an A. C. motor specification (also see Motor Selection Guide), it is common that engineers only identify the rated values that usually appears on characteristics motors data, but turns up that motors that will be used in classify areas as oil and petrochemical industries standards dictated that they must have two identification – rated values plaques, the first with the rated operational values:
Speed, Voltage, Power Factor, efficiency, Full load current, service factor, frame, etc. as in the following picture
The other plaque brings very important data that experience have thought me must people do not mention any of this at the time of purchase a motor and then when the order arrive comes along with regrets since the motor can’t be used; the other plaque indicates the type of area that it have been made to work in.
Class, Division, work group. (E.g. Class 1, Division II Groups ABCD)
Protection Type IP.
Temperature class (It’s not the same that operation temperature of the motor), this is referred to the type of gas in the atmosphere that it’s around the pump – motor package.
Start Type: DOL (Direct on-line, soft – starter, VFD - Variable Frequency Drive)
All this parameters al highly important for the specification of an A.C motor as well as the general rated values, and are this characteristics the ones that will make more or less expensive the motor but the cannot be omitted. Therefore that if your to specify the replacement of a motor that have suffer damage of as well if it’s the case that is for a new installation, Care and attention its needed when the rated values and plaques data it’s been indicated in the purchase order.
The most important specifycation to be made in A.C. motors in this cases is class temperature, now lets see what it is.
Temperature Class
|
Maximum superficial temperature
|
Ignition Point of the combustible material
|
T 1
|
450 oC
|
> 450 oC
|
T 2
|
300 oC
|
> 300 oC
|
T 3
|
200 oC
|
> 200 oC
|
T 4
|
135 oC
|
> 135 oC
|
T 5
|
100 oC
|
> 100 oC
|
T 6
|
85 oC
|
> 85 oC
|
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Nice Post.
ReplyDeleteThanks for share such useful info with us.
Hazardous area electrician Dandenong
You are right that ac electric motor has two basic electrical parts: a "stator" and "rotor" and the stator is the stationary electrical component. The rotor is the rotating electrical component rotates the motor shaft. All the information about alternating current electrical motor is really worth appreciable, looking for forward this great post. Many thank for sharing your experience.
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