# Torque in AC Machines: Why is Theta Same?

• Eng.FA
In summary, torque in AC machines is the rotational force generated by an AC motor, responsible for its movement and rotation. It is directly proportional to theta, which is the phase angle between voltage and current in an AC circuit. Theta is important in determining the direction of torque. The stator winding, which creates a magnetic field, greatly affects the strength and direction of torque. Torque in AC machines has practical applications in powering industrial machinery, electric vehicles, household appliances, and generators.
Eng.FA
hi

i have question related to

torque = force X r = Fr sin (theta)
and
torque = k (Br X Bs) = k BsBr sin (theta)

why does theta the same in both ??

theta is not same in both.because in t=frsin(theta) theta will be 90 degrees considering normal dc motors or synchronous motors.because,net force acts in direction in which rotation is possible,that means only along the tangential direction to the rotoe cylinderical body.

## 1. What is torque in AC machines?

Torque in AC machines refers to the rotational force that is generated by an alternating current (AC) motor. It is responsible for the movement and rotation of the motor's shaft.

## 2. How is torque related to theta in AC machines?

Theta, also known as the phase angle, is the angle between the voltage and current in an AC circuit. In AC machines, the torque is directly proportional to theta, meaning that as theta increases, so does the torque.

## 3. Why is theta important in understanding torque in AC machines?

Theta is important in understanding torque in AC machines because it determines the direction of the torque. The direction of the torque is determined by the phase relationship between the voltage and current, which is represented by theta.

## 4. How does the stator winding affect torque in AC machines?

The stator winding, which is responsible for creating a magnetic field in the motor, is a major factor in determining the torque of an AC machine. The number of stator windings and their configuration can greatly affect the strength and direction of the torque.

## 5. What are some practical applications of torque in AC machines?

Torque in AC machines has a wide range of applications, including powering industrial machinery, electric vehicles, and household appliances. It is also used in generators to convert mechanical energy into electrical energy.

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