Question

Трехфазный электродвигатель включен в сеть 220 В и потребляет ток 10 А. Cos φ двигателя 0,85, КПД 80%. Определить мощность на валу двигателя.

Answer 1

220*10*0/85*0/8=1496 вт

Answer 2

Calculation of Motor Power

To determine the power on the motor shaft, we need to use the formula:

P = U × I × √3 × cos(φ) × η

Where: - P is the power on the motor shaft, - U is the voltage (220 V), - I is the current (10 A), - √3 is the square root of 3 (1.732), - cos(φ) is the power factor of the motor (0.85), - η is the efficiency of the motor (80%).

Let's substitute the given values into the formula:

P = 220 V × 10 A × 1.732 × 0.85 × 0.8

Calculating this expression gives us the power on the motor shaft.

Please note that the given information does not provide the efficiency of the motor. To proceed with the calculation, we will assume the efficiency to be 80% based on the information provided.

Now, let's calculate the power on the motor shaft using the given values:

P = 220 V × 10 A × 1.732 × 0.85 × 0.8

The power on the motor shaft is approximately 2,639.04 Watts.

Please note that the accuracy of this calculation depends on the accuracy of the given values and assumptions made.