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Universal motor

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Emily Allison

on 7 May 2013

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Transcript of Universal motor

UNIVERSAL MOTOR ELECTRIC MACHINES Source: http://image.made-in-china.com/2f0j00aCDEYwoGVRqI/Universal-Motor-U8820B-.jpg 1. Introduction
2. Basic overview
3. Typical uses
4. Speed control
B) Construction Diagram http://home.howstuffworks.com/how-to-repair-major-appliances6.htm TYPICAL USES A) Uses
B) Adavantages VS. Disadvantages USES Home appliances;
-shavers, office machines, sewing machines, vacuum cleaners...

Industrial electric tools;
- drills, angles grinders, industrial fans... ADVANTAGES vs. DISADVANTAGES SPEED CONTROL Speed control Rheostat example.. CHARACTERISTICS A) Torque & Speed
B) Voltage & Current TORQUE & SPEED Torque:
Starting (full load): 3.5
Decreases when rotation speed increases
Increases when current increases Speed:
Output (Watts): 2.5-500
Range (rev/min): 3000-20000
Rotation speed is determined by the load when field coil and armature coil are connected in series.
No constant speed- only runs as fast as load permits VOLTAGE & CURRENT Voltage:
Electromagnetic Interference (EMI): Continuous Current:
Starting (full load): 3.5
Power Factor (PF): 0.5-0.7
Efficiency: 0.3-0.7 Good power to weight ratio
Speed Variable
Compact Low reliability
Low efficiency
Poor Electromagnetic Interference (EMI)
Not recommended to be kept running over a long period of time Applications:
-Products where high speed and lightweight is desired. UNIVERSAL MOTOR:
Electric motor that can run on single-phase AC or DC power
Also known as:
-AC series motor
-AC commutator motor REFERENCES http://www.freescale.com/webapp/sps/site/application.jsp?code=APLUNIMOT Slide 10 NZQA Unit Standard No 21787; Demonstrate and Apply Electronic Knowledge to Mechanical Engineering. Learning material & Assessment Guide. Slide 9, 12, 13, 14, 17 & 18 The speed of a universal motor is controlled by varying the field strength, using a variable resistor (rheostat) that varies the current.
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