Why dc series motor is not run at no load?

Why dc series motor is not run at no load?

Speed of DC Series Motor ωm = Very high, which is also clear from the Speed Current Characteristics of DC Series Motor as shown in figure above. Therefore if the DC Series Motor is started at No Load then the speed of DC Series Motor will become dangerously high which will definitely damage the DC Series Motor.

Can we operate dc series motor at no load condition?

At no load condition, load on the motor is zero hence armature current(Ia) is also zero. Hence based on above discussion it is advised that DC Series motor should not operate at no load condition. We can also understand above by knowing characteristics of DC series motor.

What will happen when dc series generator is started without load?

If there is no load is connected to series generator the current in the field winding would be absent and there by no flux is available for voltage to be generated.

Which motor Cannot be started under no load condition?

If it is started without load the field current will be less, hence flux will be less and due to this motor speed will go infinite and damages itself. This is the reason why series motor should not be started without load and shunt motor can be started without load. , Made my first DC motor at age of 7.

Why does the dc series motor run dangerously at high speed under no load condition?

As field current is zero so field flux(ø) is zero. In the above formula for ø=0, N is Infinity and hence the motor runs at dangerously high speed at no load.

Can we start dc shunt and dc series motor without load?

You can start a DC shunt motor without a load, but never start a DC shunt motor with heavy load because, The change in field flux is very less due to the load, so we can assume the flux to be constant. So flux ɸ is constant, and the speed, N ∝ Eb where Eb is the back emf.

Can we start DC shunt and DC series motor without load?

Why does the DC series motor run dangerously at high speed under no load condition?

Which can be started on no load Unlike DC series motor?

Unlike DC series motor, DC compound motor can be started on no-load. Explanation: Cumulative motor takes best from shunt motor and series motor as well. Due to shunt field flux component, DC cumulative motor can be started on no load.

What is the main disadvantage of a series motor?

The series motor has poor speed regulation. When the load speed of the machine increases, the DC shunt motor keeps its constant speed from no load to full load. The dc series motor’s Torque drops sharply when the speed increases.

What will happen when the series self excited DC motor operate at no load?

Self-excited, shunt DC generator operating at no load The magnetization curve produced when the machine is separately excited still applies. Because the load current is zero, the only current in the armature winding is the field current.

Why a DC series motor should not be started without load Mcq?

at no load, it will rotate at dangerously high speed. at no load, it will rotate at dangerously high speed. …

Why DC series motor should not be operated on light loads?

This can be seen from the speed-armature current and the speed-torque characteristics that on low armature current and low torque condition motor shows a tendency to rotate with dangerously high speed. This is the reason why DC series motor should never be started or Operated on light loads or No load conditions.

Why DC series motor should not be used for belt drives?

This is the reason why DC series motor should never be started or Operated on light loads or No load conditions. For this reason, it is not selected for belt drives as breaking or slipping of belt causes to throw the entire load off on the motor and made to run motor with no load which is very dangerous.

What will happen if a motor is started without load?

If it is started without load the field current will be less, hence flux will be less and due to this motor speed will go infinite and damages itself. This is the reason why series motor should not be started without load and shunt motor can be started without load.

What is the armature current of a DC series motor?

In case of DC Series motor armature current is decided by the load. On light load or NO load, the armature current drawn by the motor is very small. In case of a DC series motor, Φ α Ia (or) Flux( Φ) is directly proportional to armature Current( Ia). On No load as Ia is small hence flux produced is also very small.