DC Motor
Main content:
✔️ What is a DC motor?
✔️ Construction and classification of DC motors
✔️ Working principle of DC motor
✔️ DC Motor For Sale
✔️ Application of DC motor
What is a DC motor?
DC motors (DC stands for “Direct Current Motors”) belong to the class of induction motors, they are controlled by a current with a definite direction of “Direct Current.” Basically DC is extracted from DC Generator and Battery With these two types of power sources, DC Motor both receive and operate.
A direct current (DC) motor is a machine that implements the communication between electricity and magnetism based on the law of electromagnetic induction (by Faraday), for the purpose of generating kinetic energy.
DC motors today are not only appearing in civil, they are appearing more and more in industrial systems. For example, servo motor, stepper motor, etc.
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| A DC motor and its holder |
Note:
- The first DC motor was developed around 1830-1840, developed shortly after Fraraday discovered the law of electromagnetic induction in physics.
- Initially, the DC Motor was not commercially successful, because the main power supply was the Battery. But now the battery is extremely expensive but the quality is low.
- Until the alternating current (AC) grid created by Nikola Tesla, the battery, the rechargeable battery was developed, the DC motor was only commercialized and available on the market. To be more precise, the science of electronics in the early 20th century was very advanced, and they knew how to easily convert AC to DC to power DC motors.
Construction and classification of DC motors
The structure of a DC motor usually consists of the following main parts:
- Stator: is one or more pairs of permanent magnets or electromagnets
- Rotor: the core is wound with coils to create an electrical and magnetic interface, to generate the rotational kinetic energy of the shaft.
- Brushes: keep contact and power for the commutator
- Commutator: is responsible for contacting and dividing the power supply for the windings on the rotor. The number of contacts will correspond to the number of windings on the rotor.
Stator:
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| The stator of the DC motor, in addition to the permanent magnet, can be combined with the coil to create an electromagnet. |
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| The wire is wound on the rotor of the DC motor in a direction perpendicular to the magnetic induction of the stator to get the maximum thrust. |
The opposite polarity between the two magnetic fields inside the motor causes it to rotate. DC motors are motors based on the simplest idea of electrical and magnetic communication, and are used in household appliances, such as electric razors and electric windows in cars.
DC motors are divided into 2 basic groups (classification):
- DC motor with brush
- Brushless DC motor
The common point of these two types is that the current that also powers them to operate is DC.
A special feature of brushless DC motors: the input current is processed (converted) into DC in the form of rectangular or trapezoidal pulses. The tool that converts the input source into DC is the electronic circuit inside it. It is nominally a DC motor, but in structure it is no different from an AC induction motor. The only difference is that the current for it to work is in the form of DC pulses.
Working principle of DC motor
The stator of a DC motor is usually a permanent magnet or an electromagnetic coil, to generate a magnetic field. The rotor consists of windings and is connected to a DC power source. Another important part of a DC motor is the rectifier. This part is responsible for changing the direction of current in the rotation of the rotor is continuous. Normally, this part will have 2 components: a set of commutators and a set of brushes in contact with the commutator.
When current flows through the armature, also known as a coil, placed between the north and south poles of the magnet, the magnetic field generated by the armature interacts with the magnetic field from the magnet and creates a moment.
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| Structure to show basic DC Motor working principle |
The direction of this force is determined by Fleming's left hand rule and its magnitude is given by F = B.I.L. Where, B = flux density, I = current, and L = length of the conductor in the magnetic field.
Fleming's Left Hand Rule: If we extend the first finger, the second finger and the thumb of the left hand at right angles to each other, and the direction of the magnetic field is represented by the first finger, the direction of the current is represented. with the second finger. , then the thumb represents the direction of the force applied by the current conductor.
Related: Typical DC Motor Inductance
DC Motor For Sale
DC motors on the market are very diverse, including brushless DC motors in them, although this type of motor is AC induction motor in nature.
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| The untold variety of DC motors |
Therefore, I will only recommend reputable brands selling electrical equipment in China and the US:
- 👉 FAR ALONG's DC motor
- 👉 VEVOR DC motor
- 👉 DC Motor Machinery CN
- 👉 DC motor of CNMALL CO (lots of brushless DC motors)
Application of DC motor
Thanks to the different types of DC motors, there are many applications for this DC motor in all areas of life: in televisions, industrial machines, in FM radio, DC drives, printers- photo, especially in the transportation industry, and devices that need to control the speed of rotation continuously over a large range.
All around us, small DC motors are used in various tools, toys and household appliances.
In industry, the applications of DC motors include conveyors and turntables, etc. The use of high power DC motors in applications such as braking and reversing
Special applications of induction motors, including DC motors:
🌀 Nikola Tesla's Ether Technology:
💠 Harnessing the power of back electromagnetic fields (Back EMF)
💠 Back EMF generates Lenz's Force in generator 💠 When the output energy is not affected by the Lenz (free) force, a self-powered mechanism will be established from the AC generator head to the induction motor. And the kinetic energy of the induction motor at that time was only supposed to stir the Ether by Nikola Tesla's "Rotating Magnetic Field". That's the mechanism for a Free Energy AC generator - no fuel needed - Self-powered generator.
AC generator without fuel: Simple Energy Hack KILLS Power Bills And Generates Power On Demand
Free Energy AC generator 👆
💠 Harnessing the power of back electromagnetic fields (Back EMF)
💠 Back EMF generates Lenz's Force in generator 💠 When the output energy is not affected by the Lenz (free) force, a self-powered mechanism will be established from the AC generator head to the induction motor. And the kinetic energy of the induction motor at that time was only supposed to stir the Ether by Nikola Tesla's "Rotating Magnetic Field". That's the mechanism for a Free Energy AC generator - no fuel needed - Self-powered generator.
AC generator without fuel: Simple Energy Hack KILLS Power Bills And Generates Power On Demand
Free Energy AC generator 👆
