The self and mutual inductances of a doubly excited magnetic system are Ls=0.6+0.20cos2θr H and Lr=0.75+0.30cos2θr H and Msr=0.8cosθr H. For a stationary rotor at an angular position of θr=60°,what is the magnitude of torque when the currents is=20A DC and ir=10A DC?

Basic Concepts in Rotating Machines topics include: Rreluctance motor, synchronous motors, singly and doubly excited systems, torque production, rotating machines terms and rotating magnetic field. Rotating machines have four main parts: Mechanical stator: The stationary part of the machine Electrical field winding: The rotating magnetic field component Mechanical rotor: The rotating part of the machine Electrical armature winding: The current producing component Windings: All rotating electrical machines have two windings, one on the stator and one on the rotor. The winding that... Show more

Basic Concepts in Rotating Machines topics include: Rreluctance motor, synchronous motors, singly and doubly excited systems, torque production, rotating machines terms and rotating magnetic field.

Rotating machines have four main parts:
Mechanical stator: The stationary part of the machine
Electrical field winding: The rotating magnetic field component
Mechanical rotor: The rotating part of the machine
Electrical armature winding: The current producing component

Windings: All rotating electrical machines have two windings, one on the stator and one on the rotor. The winding that induces voltage is called the armature winding, and the winding that produces the main magnetic flux is called the field winding.
Types of machines: Rotating electrical machines can be either DC or AC machines. In DC machines, the stator is used as a field and the rotor is used as an armature. In AC machines, the reverse is true.
Torque: The torque of a rotating machine can be calculated using the formula torque = force x radius. Force is the amount of push or pull that the machine exerts on the object or load, and radius is the distance from the center of rotation to the point where the force is applied.
Balancing: The fundamental concepts of balancing are to monitor the effect on the synchronous (i.e., 1X) response of the machine due to one or more small masses attached.

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