Why do the DC series motor gives high starting torque?
It is clear from the above characteristics of DC Series Motor that, higher the armature or load current, higher is the torque till the magnetic flux causes saturation. Once saturation occurs, the flux will no longer increase in proportion to the increment in current and thus limits the increase in torque.
Why does a DC motor have a higher starting current?
Answer: The starting current is high as there is no back EMF or counter EMF present in the armature circuit because atstarting counter EMF is zero. … It’s armature has very less resistance due to this it need more current at starting time. Hence DC starters are used to limit the starting current ofmotor.
How can a DC motor limit current?
- Make sure the load is never so high that the motor stalls or overloads.
- Make sure that the voltage is so low that the current through the windings will never be higher than rated.
- Use a current controller to drive the motor that can limit the current at the given maximum.
What is used to prevent high starting current in DC motor?
Starters are used to protect DC motors from damage that can be caused by very high current and torque during startup. They do this by providing external resistance to the motor, which is connected in series to the motor’s armature winding and restricts the current to an acceptable level.
Why DC shunt motor is used in lathe?
Where a series motor shows a direct, inverse relationship between the load and the speed, while a shunt motor can maintain a constant speed, regardless of the load on the motor. … Shunt DC motors can be used in centrifugal pumps, lifts, weaving and lathe machines, blowers, fans, conveyors, spinning machines, and more.