45 steel is a commonly used medium carbon quenched and tempered structural steel. The name in GB is also called "oil steel". Most of the spot hot rolling in the market; The cold rolling specification is between 1.0 ~ 4.0 mm, and the cold plasticity of the steel is general, and the annealing and normalizing are slightly better than the quenching and tempering, so it has higher strength and better machinability. After proper heat treatment, certain toughness, plasticity and wear resistance can be obtained, and the material source is convenient. Suitable for hydrogen welding and argon arc welding, not for gas welding. Preheating before welding and stress relief annealing after welding.
Alloy material is a kind of material with metallic characteristics, which is synthesized by two or more metals and nonmetals through a certain method. Generally, it is melted into a uniform liquid and solidified. According to the number of constituent elements, it can be divided into binary alloy, ternary alloy and multicomponent alloy.
When three-phase symmetrical alternating current is applied to the three-phase stator winding of the motor, it will generate a rotating magnetic field and cut the rotor winding, thus generating an induced current in the rotor winding (the rotor winding is a closed path), and the current-carrying rotor conductor will generate an electromagnetic force under the action of the stator rotating magnetic field, thus forming an electromagnetic torque on the motor rotating shaft to drive the motor to rotate, and the motor rotating direction is the same as that of the rotating magnetic field.
When a conductor cuts magnetic lines in a magnetic field, an induced current is generated in the conductor, hence the name "induction motor". The combined action of induced current and magnetic field exerts driving force on the motor rotor.
We let the closed coil ABCD rotate around the xy axis in the magnetic field B. If the magnetic field is rotated clockwise, the closed coil will be subjected to variable magnetic flux, which will produce induced electromotive force and induced current (Faraday's law). According to Lenz's law, the direction of current is the reason why the action of induced current always hinders induced current. Therefore, each conductor bears the Lorentz force F which is opposite to the motion direction of the induced magnetic field.
A simple way to determine the force F direction of each conductor is to use the right-hand three-designation rule (the magnetic field acts on the current to place the thumb in the direction of the induced magnetic field and the index finger in the direction of the force). Place the middle finger in the direction of the induced current. In this way, the closed coil bears a certain torque and rotates in the same direction as the magnetic field of the inductor, which is called rotating magnetic field. The electric torque generated by the rotation of the closed coil balances the load torque.
Baidu Encyclopedia-Three-phase Asynchronous Motor