Before understanding this excitation of the electrical motor, it must be remembered that any electromagnetic device must draw a magnetizing current from the AC source to supply the required workflow. This magnetizing current is nearly 90o at the supply voltage. In other words, the function of this magnetizing current or delayed VA attracted by the electromagnetic device is to align the flow within the magnetic circuit of the device. So it comes under an electromagnetic device. It receives three-phase electrical supply to the armature winding and DC power to the rotor winding.
Synchronous motor excitation refers to the DC power supplied to the rotor, which is employed to provide the required magnetic flux.
One of the most and unique characteristics of this motor is that it's frequently operated on any electric power factor that drives, is delayed or with a unit, and this feature is predicated on the excitation of the electrical motor. When the electric motor is running at constant applied voltage V, the resulting air gap flow, as needed by V, remains substantially constant. This resulting air gap is established by the cooperation of the AC supply of the armature winding and therefore the DC supply of the rotor winding.
Synchronous motor excitation refers to the DC power supplied to the rotor, which is employed to supply the required magnetic flux.
One of the most and unique characteristics of this motor is that it is often operated on any electric power factor it's carrying, with delay or unit, and this feature is predicated on the excitation of the electric motor. When the electric motor is working with constant applied voltage V, the resulting air gap flow, as needed by V, remains substantially constant. This resulting air gap is established by the cooperation of the AC supply of the armature winding and therefore the DC supply of the rotor winding.
CASE 1: When the sector current is sufficient to supply the air gap flow, as needed by the constant supply voltage V, the magnetization current or the delayed reactive VA required from the AC source is zero and therefore the motor operates with the factor the unit's power. the sector current, which causes this unit power factor, is named normal excitation or normal field current.
CASE 2: If the sector currently isn't sufficient to supply the required air gap flow, as needed by V, the extra magnetization current or delayed reactive VA are going to be drawn from the AC source. This magnetizing current produces the deficient flow (constant flow configured by the winding of the DC supply rotor). Therefore, during this case, the engine is claimed to work under a delayed power factor and is claimed to be under excitation.
CASE 3: If the sector current is bigger than the traditional current, the motor is excited. This excess current within the field produces excess flow (flow configured by the winding of the DC supply rotor - flow resulting from the air gap) that has got to be neutralized by the armature winding.
Therefore, the armature winding absorbs the most reactive VA or the initial voltage of the demagnetizing current at almost 90o from the AC source. Therefore, during this case, the engine operates under the most power factor.
This whole concept of excitation and power factor of the electric motor is often summarized within the following graph. this is often called the V curve of the electric motor.
Image Source- Google
Conclusion: An overexcited electric motor operates with the main power factor, an under excited electric motor operates with a lagged power factor and a traditional excited electric motor operates with one power factor.
Synchronous motor excitation refers to the DC power supplied to the rotor, which is employed to provide the required magnetic flux.
One of the most and unique characteristics of this motor is that it's frequently operated on any electric power factor that drives, is delayed or with a unit, and this feature is predicated on the excitation of the electrical motor. When the electric motor is running at constant applied voltage V, the resulting air gap flow, as needed by V, remains substantially constant. This resulting air gap is established by the cooperation of the AC supply of the armature winding and therefore the DC supply of the rotor winding.
Synchronous motor excitation refers to the DC power supplied to the rotor, which is employed to supply the required magnetic flux.
One of the most and unique characteristics of this motor is that it is often operated on any electric power factor it's carrying, with delay or unit, and this feature is predicated on the excitation of the electric motor. When the electric motor is working with constant applied voltage V, the resulting air gap flow, as needed by V, remains substantially constant. This resulting air gap is established by the cooperation of the AC supply of the armature winding and therefore the DC supply of the rotor winding.
CASE 1: When the sector current is sufficient to supply the air gap flow, as needed by the constant supply voltage V, the magnetization current or the delayed reactive VA required from the AC source is zero and therefore the motor operates with the factor the unit's power. the sector current, which causes this unit power factor, is named normal excitation or normal field current.
CASE 2: If the sector currently isn't sufficient to supply the required air gap flow, as needed by V, the extra magnetization current or delayed reactive VA are going to be drawn from the AC source. This magnetizing current produces the deficient flow (constant flow configured by the winding of the DC supply rotor). Therefore, during this case, the engine is claimed to work under a delayed power factor and is claimed to be under excitation.
CASE 3: If the sector current is bigger than the traditional current, the motor is excited. This excess current within the field produces excess flow (flow configured by the winding of the DC supply rotor - flow resulting from the air gap) that has got to be neutralized by the armature winding.
Therefore, the armature winding absorbs the most reactive VA or the initial voltage of the demagnetizing current at almost 90o from the AC source. Therefore, during this case, the engine operates under the most power factor.
This whole concept of excitation and power factor of the electric motor is often summarized within the following graph. this is often called the V curve of the electric motor.
Image Source- Google
Conclusion: An overexcited electric motor operates with the main power factor, an under excited electric motor operates with a lagged power factor and a traditional excited electric motor operates with one power factor.
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