Publish Time: 2023-01-30 Origin: Site
A magnet has N pole and S pole, cut in half in the middle to become two magnets, and also has N pole and S pole, that is, smash it into countless particles, each particle has N pole and S pole. Magical or not? Static things seem to have become alive and dynamic! When the N and S poles are close together, they attract each other. When N and N poles are close together, they repel each other. This is common sense as a child, nature is really fascinating!
Here is the list
The principle of DC motor rotation
What is self-excitation and separate excitation of DC motor
difference between DC motors and AC motors
Even more surprising, a short circuit occurs when the wires are connected to a DC power source. If the wire is wound into a spiral shape and connected to a DC power supply, the wound coil will not be short-circuited, and an electromagnet will also be formed, and there are also N poles and S poles. N pole and S pole can be determined by winding direction and current direction. If any conditions change, the direction of the electromagnet changes. Once the winding is wound, it is not easy to change, but the direction of the current can be easily changed, that is, the polarity of the electromagnet can be changed at any time by changing the direction of the current. What would happen if this wound coil was placed in the middle of a stationary permanent magnet and a direct current was applied to the wound coil? The coil will turn! Congrats, you did it right, the coil will turn. Why go where? The reason is that like poles repel each other, and opposite poles attract each other. If the current direction keeps changing, the polarity of the coil keeps changing as well. In this case, the wound coil will continue to rotate.
This is the primary model of the DC motor (permanent magnet type), the thing that changes the direction of the current is the commutator of the coil, and the two poles connected to the power supply are called the carbon brush of the DC motor. In addition to the permanent magnet type, DC motors are also divided into separate excitation and self-excitation, among which self-excitation is divided into shunt excitation, series excitation and compound excitation, but no matter which type, it is from the DC motor model, but each One has its own characteristics and different usage occasions, which will be discussed later.
Do not! Is there a rotating magnetic field? Do not! This is the biggest difference between DC motors and AC motors. Some people ask, why do you say that today? I did experiments in high school, because I found that the frequency of using low-power DC motors is too high now, and it may be higher in the future, so this is an expansion of the field! Many power tools and appliances are powered by DC motors due to their convenience. Household sweepers, electric toothbrushes, etc. are also important applications of DC motors. DC motors are also relatively easy to damage, especially the brushes and commutators, which have poor overload capacity and large starting current. This is also the disadvantage of DC motors. If you understand the principle, you must know how to check and deal with it, and you should know how to maintain it.
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