1. An armature is a part of a motor with a coil that moves relative to a magnetic field. In the generator, induced electromotive force is generated in the stressed rotating coil, which makes it generate electricity. In the motor, the electrified coil is acted by ampere force in the magnetic field, which makes it rotate in the magnetic field. In DC engine, the main magnetic field is generated by the excitation coil.
2. In both power generation and electric mode, armature carries current and establishes magnetic field, which is called armature flux. The influence of armature flux on the main magnetic field is called armature reaction.
Related knowledge of armature reaction
1, armature reaction refers to the interaction between armature magnetic field and air gap magnetic field. During the operation of the motor, the current in the armature winding will produce armature magnetic field, which interacts with the air gap magnetic field to produce armature reaction. Armature reaction has a certain influence on the running performance and stability of motor, so it is one of the important problems in motor design.
2. Magnetic field distortion: armature reaction will lead to distortion of air gap magnetic field distribution, thus changing the electromagnetic torque of the motor, thus affecting the speed and output power of the motor. Torque fluctuation: due to armature reaction, the electromagnetic torque of the motor will fluctuate, which will affect the stability and accuracy of the motor operation.
3. Additional loss: armature reaction will produce additional copper loss and iron loss, which will increase the energy consumption of the motor and reduce the efficiency of the motor. Vibration and noise: armature reaction will cause vibration and noise of the motor, which will affect the running stability and service life of the motor.
4. Oblique pole structure: Oblique pole structure can make the distribution of air gap magnetic field more uniform, thus reducing the influence of armature reaction on the motor. Adopt magnetic slot wedge: magnetic slot wedge can enhance the strength of air gap magnetic field, thus reducing the influence of armature reaction on motor.
5. Optimizing winding design: Optimizing winding design can make current distribution more uniform, thus reducing the influence of armature reaction on motor. Adopt dynamic control technology: dynamic control technology can monitor the running state of the motor in real time and dynamically adjust the armature current, thus reducing the influence of armature reaction on the motor.