T cells are responsible for cell-mediated immunity. True of false: Memory B cells can produce a faster and more intense response to a subsequent exposure to the antigen. True True or false: Red blood cells, found in lymphatic vessels and organs, help defend the body against disease.
An armature in a motor is defined as rotating part of a motor that emits electric energy into a magnetic field. Other People Are Reading.
Inside these motors, permanent magnets bonded to a flux-return ring replace the stator field windings found in shunt motors. A wound armature and mechanical brush commutation system complete the motor. The permanent magnets supply the surrounding field flux, eliminating the need for external field current. This design yields a smaller, lighter, and energy efficient motor. Unlike a shunt wound dc motor, a PM motor is free of interaction between the permanent magnet field and the armature demagnetizing cross field. Shunt wound DC motors experience significant interaction between the armature and the stator. The statorâs low reluctance (high permeability) iron core ultimately weakens the field as the load increases.