How will the armature current and the output power of a direct current series wound motor change with increasing load torque?

How will the armature current and the output power of a direct current series wound motor change with increasing load torque?

As net voltage Enet = E − Eb. Since supply voltage E remains constant. As a result of this increased amount of net voltage, the armature current increases and consequently the torque increases. This increase in the amount of torque increases the speed and thus compensating for the speed loss on loading.

What happens when armature current increases?

If field current is increased while armature terminal voltage is held constant then speed of motor will also increase.

What will happen to torque if armature current increases in DC series motor?

load of a DC series motor. When the load increases on this motor, the armature slows down. This reduces the CEMF and allows the current through the armature and field windings to increase. The increase in current will increase the torque.

What happen if the load current increases in case of DC motor?

In case of DC shunt motor, the flux per pole is considered to be constant, torque increases with the increase of load current. If the load current increases then the armature current also be increased and the speed slightly falls due to increase in voltage drop in armature.

What is armature current?

In electrical engineering, the armature is the winding (or set of windings) of an electric machine which carries alternating current. The first is to carry current across the field, thus creating shaft torque in a rotating machine or force in a linear machine.

What is the relation between armature torque and armature current in dc series motor?

The torque in case of a dc series motor is proportional to the square of the armature current. This relation is parabolic in nature as shown in the figure. As load increases, armature current increases and torque produced increases proportional to the square of the armature current up to a particular limitation.

How do you increase armature current?

Armature current could be increased up to the rated, by which the speed could be increased up to rated, by varying applied voltage. Some general informations about shunt motor.

In which motor speed increases with increase in armature current is?

Explanation: Shunt motor speed though decreases by slight value as armature current increases, it is assumed to be constant. But series motor and cumulative motor speed decreases as armature current increases. Only differential motor flux reduces with increase in armature current thus, speed increases.

Why torque is proportional to armature current in shunt motor and why it is proportional to square of the armature current in case of series motor?

In dc shunt motors, flux is constant (not dependent on armature current). Hence torque is proportional to armature current. In dc series motors, flux is directly proportional to armature current. Hence torque is directly proportional to square of the armature current.

Why does the armature current decrease as the motor speed increases?

The generator voltage opposes the driving voltage. With a lower overall voltage across motor’s internal resistance as the motor turns faster, the current flowing into the motor decreases. The faster the motor spins the less current it draws.

What is armature current in dc motor?

In the armature, an electromotive force is created by the relative motion of the armature and the field. When the machine or motor is used as a motor, this EMF opposes the armature current, and the armature converts electrical power to mechanical power in the form of torque, and transfers it via the shaft.

What is armature DC motor?

A DC motor has coils of wire mounted in slots on a cylinder of ferromagnetic material, which is termed the armature. The armature is mounted on bearings and is free to rotate. It is mounted in the magnetic field produced by permanent magnets or current passing through coils of wire, which are called the field coils.

Why does armature current increase when load on the DC motor increase?

With a lower overall voltage across motor’s internal resistance as the motor turns faster, the current flowing into the motor decreases. The faster the motor spins the less current it draws. Why does armature current increase when load on the DC motor increase? When the load increases the motor slows down. This reduces the counter EMF.

How does torque depend on armature current in DC shunt motors?

In case of DC shunt motors, we can assume the field flux ɸ to be constant. Though at heavy loads, ɸ decreases in a small amount due to increased armature reaction. As we are neglecting the change in the flux ɸ, we can say that torque is proportional to armature current.

What is the relation between torque and armature current?

Torque vs. armature current (T a-I a) This characteristic is also known as electrical characteristic. We know that torque is directly proportional to the product of armature current and field flux, T a ∝ ɸ.I a. In DC series motors, field winding is connected in series with the armature, i.e. I a = I f.

What happens to the field flux in a DC series motor?

In dc series motor, the armature current also flows through the field circuit. This is because the field and armature are in series in dc series motor. Again, the field flux is directly proportional to the current flowing through the field. That means.