What does a motor do in a circuit?

What does a motor do in a circuit?

A motor converts electrical energy into mechanical energy.

What will happen if the field of the DC shunt motor is accidentally removed?

Answer: n d.c shunt motor if field winding supply is removed the motor back emf will drop to zero, hence the armature will draw more current to make up the emf. this results in blowing up of fuse.

What will happen to a DC series motor when its load is removed?

What occurs if the load is removed from an operating series DC motor? It will stop running.

What will happen to a series motor if it is allowed to run under no load conditions?

A series motor should never be started at no load. With no mechanical load on the series motor, the current is low, the counter-EMF produced by the field winding is weak, and so the armature must turn faster to produce sufficient counter-EMF to balance the supply voltage. The motor can be damaged by overspeed.

What is a motor used for?

An electric motor is a device used to convert electrical energy into mechanical energy. Scientifically speaking, the electric motor is a unit used to convert electric power into motive energy or electrical energy into mechanical energy.

What does motor activity mean?

Motor activity involves movement quality and quantity that both influence and are influenced by states of arousal. Imbedded in activity levels are the qualitative aspects of movement that include muscle tone, posture, coordination, symmetry, strength, purposefulness, and planning, or praxis.

What will happen when the field of a DC shunt motor gets opened while the motor is running Why?

4. What will be the effect of opening of field of a DC shunt motor while motor is running? Explanation: In a DC shunt motor if supply for the field winding is cut down, the speed would dangerously increase in order to maintain the back emf of the motor.

What all may happen if the DC shunt motor running on no load has its shunt field winding opened accidentally?

What will happen if the d.c. shunt motor opened accidentally running on no-load has its shunt field winding? The field will be reduced to only to the value of residual flux. The speed will be very high. The parts of motor may even fly apart.

Why should DC series motor started with load?

Important: When the motor is connected across the supply mains without load, it draws small current from the supply mains. The increase in back emf weakens the armature current and hence the field current. This cause again increases the speed so the back emf.

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.

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 happens if the DC machine remains coupled to the induction motor even if it is not loaded?

The DC motor will continue its rotation if it is at NO LOAD. If the load is more than the no load ( torque required to overcome friction and windage losses) condition the motor stops and a chance of high current flow may damage the winding if the voltage applied is high (Close to rated voltage if it is there).

What happens when a shunt motor is cut off?

As for shunt motor, speed is inversely proportional to field current, so cutting off the field winding results in dangerously high speed. Thus motor gets damaged. However for series dc motor, cutting off the field winding simply decreases the speed of the motor and the motor stops. , BE (Hons.)

What happens to DC motor when field winding is cut off?

With field current cut off, a weak field will exist due to residual magnetism. Therefore, motor will overspeed to maintain back emf. However, torque will decrease in the same proportion. So, motor won’t be able to take load and finally come to a standstill, maybe after causing some damage to the motor.

Why does DC shunt motor have no magnetic field?

For a dc shunt motor if field is suddenly opened, no current flow so no flux and no magnetic field.So according to MOTOT PRINCIPLE.Conductor experiences torque only if it is placed in magnetic field.Hence the speed of motor decreases slowly due to inertia and finally it stops.

What causes a DC series motor to come to rest?

In a DC series motor, if you cut off the supply for the field winding it means you have cut the supply off the motor as the field is in series with the armature. So it will simply come to rest after sometime.