Calculating the armature current of the motor.

In summary, a single-phase, full-wave controlled bridge rectifier is connected to a 240V ac voltage source and is supplying a permanent magnet dc motor. The rectifier absorbs 1200W of active power and 1000VAR of reactive power from the source. Given that there is negligible power loss in the rectifier, the task is to calculate the armature current of the motor. Tips for approaching this problem include understanding the relationship between active and reactive power and the magnitude of power being equal to voltage multiplied by current.
  • #1
ramox3
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Homework Statement



A single-phase, full-wave controlled bridge rectifier supplies a permanent magnet dc motor. The rectifier is connected to a 240V ac voltage source and absorbs 1200W of active power and 1000VAR of reactive power from the source. If power loss in the rectifier is negligible, calculate the armature current of the motor.

Homework Equations


calculate the armature current of the motor.


The Attempt at a Solution



I don't know where to start.. any tips would be appreciated..
 
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  • #2
Active (or real) power can be thought of as a vector at right angles to reactive power.

Magnitude of power is voltage x current
 

1. What is the formula for calculating armature current?

The formula for calculating armature current is I = (V - E)/R, where I is the current in amps, V is the supply voltage in volts, E is the back EMF (electromotive force) in volts, and R is the resistance in ohms.

2. How do you determine the back EMF of a motor?

The back EMF of a motor can be determined by measuring the motor's speed and applying the formula E = k * ω, where E is the back EMF in volts, k is a constant specific to the motor, and ω is the angular velocity in radians per second.

3. What is the significance of armature current in motor operation?

Armature current is important in motor operation because it determines the amount of torque produced by the motor. The higher the armature current, the greater the torque and the stronger the motor's output.

4. How does the supply voltage affect the armature current?

The supply voltage has a direct relationship with armature current. As the supply voltage increases, the armature current also increases, resulting in a higher torque output from the motor.

5. Are there any other factors that can affect the armature current?

Aside from supply voltage, the armature current can also be affected by the motor's resistance and back EMF. Changes in these variables can alter the armature current and ultimately impact the motor's performance.

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