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DC motors classification based on NEMA Standars (Types of DC Motors…
DC motors classification based on NEMA Standars
Types of DC Motors
Series-wound motor:
A series-wound motor has the field circuit and armature circuit in series. The torque and speed are load dependent. Generally, a series-wound motor should not be operated at full volt-age while uncoupled from its load. [1]
Compound-wound motor:
A compound-wound motor has two separate field windings, one connected in the shunt field and the other connected in series in the armature. [1]
Shunt–wound motor:
A shunt-wound motor is either a straight shunt-wound motor or a stabilized shunt-wound motor. The difference between the two shunt fields is that the stabilized shunt-wound motor has a light series winding to prevent. [1]
Aplications
D.C Series motor
Air compressor
Hair drier
D.C Shunt Motors:
Drills
Lathes
D.C Compound motor
PressesShears
Reciprocating machine.
What is a DC motor?
An integral-horsepower motor of mechanical construction suitable for industrial applications under usual service conditions and has ratings and constructional and performance characteristics applying to direct-current small motors. [1]
Uses
D.C :Series motor
It is a variable speed motor.The speed is low at high torque at light or no load ,the motor speed attains dangerously high speed.The motor has a high starting torque
D.C Compound motor
Differential compound motors are rarely used because of its poor torque characteristics.
D.C Shunt Motors
It is a constant speed motor.Where the speed is required to remain almost constant from noload to full load.Where the load has to be driven at a number of speeds and any one of which is nearly constant.
What does mean Nema?
"National Electrical Manufacturers Association"
Characteristics
Characteristics of DC Motor are of the rotating armature type. The armature winding is a closed winding through the commutator. The armature is supplied through the brushes which are placed along the neutral axis on the commutator. [1]
References:
[1] Machinery equipment online, "Classification of motors and generators", 10 November 2015, [online] Available:
http://machineryequipmentonline.com/electrical-power-generation/motors-and-generatorsnema-classification-of-motors-and-generators/
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