What is the function between magnetic poles?
2 Answers
The function of magnetic poles is to generate corresponding magnetic fields through opposing direct current, completing the energy conversion between magnetic energy, kinetic energy, and electrical energy through the relative rotational movement of the rotor and stator. Below are specific descriptions about magnetic poles: 1. Motor magnetic poles: Motor magnetic poles are the fundamental conditions for establishing motor rotation. Some motors use permanent magnets to set up magnetic poles, while others use windings. AC motors use windings to create movable magnetic poles and utilize three-phase voltage to establish a rotating magnetic field composed of several pairs of magnetic poles. This rotating magnetic field drives the rotor to rotate. 2. Function of magnetic poles: To generate magnetic fields. The magnetic poles of electromagnetic motors consist of iron cores and field coils. The iron core is made of low-carbon steel in a horseshoe shape and fixed to the inner wall of the motor housing with screws. The field coils are mounted on the iron core. To increase the electromagnetic torque of the starter, four magnetic poles are generally used, and some starters with power exceeding 735KW use six magnetic poles. The field coils are wound with rectangular bare copper wire and connected in series with the armature winding. 3. Two connection methods for four field coils: One method is to connect the four windings in series and then connect them in series with the armature winding. The other method is to connect two windings in series first and then in parallel. Regardless of the connection method, the magnetic poles generated by the energized field coils must be arranged in alternating N and S poles. The function and composition of the automotive starter transmission mechanism, the function and composition of the automotive starter control device, and the function and composition of the automotive starter electromagnetic switch.
Speaking of the interaction between magnetic poles, I find it as fascinating as a gathering of friends. Like poles repelling each other is akin to people with incompatible personalities avoiding one another, while opposite poles attracting resembles like-minded individuals chatting endlessly. In daily life, this phenomenon is ubiquitous. For instance, the electric motor in my car utilizes this principle for propulsion: magnets are fixed on certain components, and by controlling the magnetic field changes via electric current, like poles push away while opposite poles pull closer, causing the motor to rotate and the wheels to spin. Without this interaction, electric vehicles wouldn't be able to run efficiently and energy-savingly. Additionally, the small magnets in the car's ABS sensors detect changes in wheel speed, ensuring no skidding during sudden braking, making it much safer. Conducting magnet experiments and observing these forces is truly thought-provoking, driving technological innovations that improve our quality of life and environmental awareness. In short, understanding this fundamental principle helps us appreciate the magic behind everyday technology.
