DC Shunt Motor
- As there is drop in speed very small from no load to full load, it is also called as constant speed motor.
- A shunt motor is capable to start against heavy load but it would require excess of input current that of series motor and compound motor i.e. if twice the full load torque required at start, the shunt motor draws the twice the full load current ( As t α Ia ) whereas the series motor would draw only 1.41 times full load current for the same amount of torque ( As t α Ia2 )
Medium starting torque
Applications
- Lathes
- Centrifugal pump
- Blowers
- Machine tools
- Printing process
- Spinning machines
- Reciprocating pump
DC Series Motor
- The starting torque develop by the series motor is greater than the shunt motor for a given armature current.
- A series motor respond by decreasing its speed with small increase in current for a given load torque.
- A shunt motor holds its speed nearly constant with large increase in input current for same amount of load torque.
Variable speed motor
Applications
- Hoists
- Cranes
- Trolley cars
- Conveyors
- Electric locomotives
Cumulative Compound DC Motor
- The shunt field is provided to guarantee a safe no load speed in which case the motor is called as stabilized series motor.
- They are used in driving machines which are subjected to sudden application of heavy loads.
Moderate starting torque
Applications
- Rolling machines
- Air compressors
- Mine hoist
- Shearing and punching machines
- Elevators
- Heavy planers
- Conveyors
Differential Compound Motor
- As the load increases, the net flux decreases.
- The differential compound motor runs at higher speed compared to shunt motor for same load.
Low starting torque
Speed control is possible
Applications
- Experimental and research work
|
DC Shunt Motor |
DC Series Motor |
DC Cumulative Compound Motor |
DC Differential Compound Motor |
|
Medium starting torque |
Variable speed motor |
Moderate starting torque |
Low starting torque Speed control is possible |
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