Why DC shunt motor is used in lathe

The shunt motors are used where constant speed is required and starting conditions are not severe. The various applications of DC shunt motor are in Lathe Machines, Centrifugal Pumps, Fans, Blowers, Conveyors, Lifts, Weaving Machine, Spinning machines, etc.

What is a DC shunt motor used for?

DC Shunt Motor Applications

These motors are used wherever stable speed is required. This kind of DC motor can be used in Centrifugal Pumps, Lifts, Weaving Machine, Lathe Machines, Blowers, Fans, Conveyors, Spinning machines, etc.

Why DC shunt motor is started on no load?

For DC shunt motor the field resistance is high and armature resistance is low so the variation of flux is very less when rated voltage is applied to the motor and motor speed does not exceeds rated speed at no load. So we can start the DC shunt motor with no load.

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Why DC shunt motor is a constant speed motor?

Since torque is proportional to armature current, torque also increases. Finally, this increased torque allows the motor to increase its speed and compensate for the slowdown due to loading. Hence, a DC shunt motor is able to self-regulate its speed, and can be referred to as a constant speed motor.

What are the characteristics of DC shunt motor?

Characteristics of a DC Shunt Motor:

  • Speed-Armature Current Characteristic: …
  • Torque-Armature Current Characteristic: …
  • Speed-Torque Characteristic: …
  • Break in Field Circuit of a DC Motor:

Where is a DC generator used?

Applications of DC Generators

They are used in DC motors where speed control is necessary. They are used as portable generators where low power supply is required. They are used in motorcycles as dynamos, in toys such as remote control cars and in appliances such as electric shavers.

What is the main disadvantage of a shunt motor?

Disadvantages of DC Shunt Motors

Installation of DC machines is expensive compare with other types of machines. Since Shunt motors are constant speed motor, it would be a disadvantage where it’s necessary to operate under variable speed.

What will happen if excitation of DC shunt motor is changed?

What will happen if excitation of DC shunt motor is changed? Explanation: The motor will accelerate the mechanical load connected during this period but no increase in the mechanical load as Pload = T1W1 = T2W2 where W2 >W1. So, at the higher speed there is less electrical torque for the same mechanical load / power.

How can the speed of a shunt DC motor be controlled?

In this method, speed variation is accomplished by means of a variable resistance inserted in series with the shunt field. An increase in controlling resistances reduces the field current with a reduction in flux and an increase in speed. This method of speed control is independent of load on the motor.

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What will happen if a shunt DC motor is directly connected to the supply line?

What will happen if DC shunt motor is connected across AC supply? Explanation: In case of parallel field connection, it won’t rotate at all and will start humming and will create vibrations, as a torque produced by positive and negative cycle will cancel out each other. DC motor will be heated up and it may burn. 2.

What is the difference between a shorted motor and a shunt motor?

What is the difference between a shorted motor and a shunted motor? A shunt motor has the field windings connected in parallel with the armature and a series motor has the field windings connected in series with the armature15.

How does a DC shunt motor work?

In a DC Shunt motor the field winding is connected in parallel (shunt) with the armature. The shunt winding is wound from many turns of small copper wire and since it is connected across the DC field supply, its field current will be constant.

What is a DC shunt?

Direct current instrument shunts are used to extend the range of ammeters whenever the current to be measured is too large to be passed through the instrument–usually currents over 50 amperes. The shunt, therefore, is a diverter which is used to “shunt” the majority of the current around the indicating instrument.

Why is the DC motor preferred over AC motor?

DC motors have the advantage of: higher starting torque, quick starting and stopping, reversing, variable speeds with voltage input and they are easier and cheaper to control than AC. AC motor advantages include: lower power demand on start and minimal maintenance.

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