Generally, an electric motor is a machine that converts electrical energy into mechanical energy and uses the generated electrical energy to generate rotational motion and thereby perform work.
Although there are many different types of motors, this page focuses on DC motors, which are motors driven by direct current (DC). DC motors are used in various devices and appliances that affect our lives.
This passage is going to talk about the followings of DC motor:
(1) Introduction to ac motor
(2) The working principle of ac motor
(3) The wide usage of ac motors
A direct current (DC) motor is a motor that converts electrical energy into mechanical energy. A DC motor obtains electrical energy from direct current and converts the energy into mechanical rotation.
A DC motor uses a magnetic field generated by a generated current, which powers the movement of a rotor fixed in the output shaft. The output torque and speed depend on the electrical input and the design of the motor.
How does a DC motor work?
The DC motor includes two key components: the stator and the armature. The stator is the fixed part of the motor, while the armature rotates. In a DC motor, the stator provides a rotating magnetic field to drive the armature to rotate.
A simple DC motor uses a set of fixed magnets in the stator and generates an electromagnetic field aligned with the center of the coil in a wire coil through which current passes. One or more windings of insulated wires are wound on the iron core of the motor to concentrate the magnetic field.
The winding of the insulated wire is connected to a commutator (rotary electrical switch), which applies current to the winding. The commutator allows each armature coil to be energized in turn, thereby generating a stable rotational force (called torque).
When the coils are opened and closed in sequence, a rotating magnetic field is generated, which interacts with the different magnetic fields of the fixed magnets in the stator to generate a torque, thereby rotating the torque. These key operating principles of DC motors enable them to convert electrical energy in DC power into mechanical energy through rotational motion, and then use it for the propulsion of objects.
This amazing electrical device has changed our lives in many ways, but who invented the DC motor? As with all major innovations, many people have a role to play in developing similar mechanisms.
In the United States, Thomas Davenport is recognized as the inventor of the first electric motor. There is no doubt that he was the first person to obtain a patent for a usable electric motor in 1837. However, Davenport was not the first to make an electric motor with various functions. When Davenport applied for a patent, European inventors had already developed a more powerful version.
In 1834, Moritz Jacobi proposed a kind of power, its power is three times that of Davenport later patented, and Sibrandus Stratingh and Christopher Becker was the first to demonstrate the practical application of electric motors by driving a small model car in 1835.
A few years later, in 1886, Frank Julian Sprague invented the first practical DC motor. This invention invented the first electric trolley system in 1887 and invented it in 1892 The first electric lift. Various applications will reshape the face of industry and manufacturing.
The term "DC motor" is used to refer to any rotating electrical machine that converts DC electrical energy into mechanical energy. The size and power of DC motors may vary, from small motors in toys and household appliances to large mechanisms that power vehicles, traction lifts and hoists, and large mechanisms that drive steel rolling mills.
Although each type has its advantages, in a broad sense, DC motors have many uses. At home, small DC motors are used for tools, toys and various household appliances. In retail, applications for DC motors include conveyor belts and turntables, while in industrial environments, applications for large DC motors also include braking and commutation applications.
The following are some specific uses of DC motors:
Fan DC motor
DC motor for pump
Toy DC motor
DC motors for electric vehicles
Robot DC motor
Bicycle DC motor