The working principle of a DC motor is to connect the DC power supply to the armature winding through the brush, so that the current flows through the armature conductor.
There is a magnetic field inside the motor, and the current-carrying rotor (armature) conductor will be subject to the action of the electromagnetic force f f = Blia (rule left).
The electromagnetic force generated by all the conductors acts on the rotor, causing the rotor to rotate at n (rpm) to drive the mechanical load. A DC motor is a motor that converts DC electrical energy into mechanical energy.
It is widely used in electric dredger because of its good speed regulation performance. DC motors are divided into three categories: permanent magnet, separately excited and self-excited according to the excitation mode. Self-excitation ist then divided into three categories: shunt excitation, series excitation and compound excitation.
It's alternating current! The engine used in hydroelectric generation is a rotating rotor generator due to its high voltage.
The key is the brush. When the direct current is small, it can be directly converted into direct current through the brush. However, when the hydropower generation energy is large, the brush cannot be used (it will cause). arc discharge). So what is sent directly is alternating current, then transformed and distributed.