What is the angle at which the electromagnetic torque is maximum?

The angle at which the electromagnetic torque is maximum in most electric machines, like synchronous and induction motors, is 90 degrees electrical. At this angle, the magnetic fields of the stator and rotor are aligned such that the torque production is maximized due to the maximum interaction between the stator’s and rotor’s magnetic fields. This principle is often explained in the context of the torque equation for electric machines, where the torque is directly proportional to the sine of the angle between the stator and rotor magnetic field vectors. Therefore, when this angle is 90 degrees, the sine function reaches its maximum value of 1, leading to the maximum possible torque.