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April 12, 2022

Difference Between Alternator and DC Generator

Difference Between Alternator and DC Generator


Electric energy is one of the most important energy sources in modern society. A generator is a mechanical device that converts other forms of energy into electrical energy. It is driven by a water turbine, a steam turbine, a diesel engine or other power machinery, and converts the energy generated by water flow, airflow, fuel combustion or nuclear fission into mechanical energy and transmits it to the generator. Converted to electricity by a generator. Generators are widely used in industrial and agricultural production, national defense, science and technology and daily life. The following small series will introduce to you "the difference between an alternator and a DC generator"

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Difference Between Alternator and DC Generator

The structure is different:

  1. 1. Alternator: usually consists of stator, rotor, end cover and bearing.
  2. 2. The DC motor is divided into two parts: the stator and the rotor.

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The principle is different:

  1. 1. DC motor: In order to make the brushless DC motor rotate, the control unit must first determine the position of the motor rotor sensed by the Hall sensor, and then determine the order of the power transistors in the inverter according to the stator winding. AH, BH and CH in the inverter are called upper arm power transistors. ) and al, bl, cl (these are called lower arm power transistors), which make current flow through the motor coils in turn, creating a forward (or reverse) rotating magnetic field and interacting with the rotor magnets, allowing the motor to operate clockwise/reverse Clock rotation.
  2. 2. Alternator: It uses the principle of electromagnetic induction to convert the mechanical energy of the prime mover into electrical energy output. A synchronous generator consists of a stator and a rotor. The stator is the armature that produces electricity, and the rotor is the magnetic pole. The stator consists of an armature core, a three-phase winding with uniform discharge, a frame and an end cover. The rotor is usually a hidden pole type, consisting of an excitation winding, an iron core and a shaft, a guard ring, a center ring, etc. The excitation winding of the rotor generates a nearly sinusoidal magnetic field (called the rotor magnetic field) through a DC current, and its effective excitation is the stator. The magnetic flux intersects the stationary armature winding. When the rotor turns, the magnetic field of the rotor turns with the same start and with each rotation. The magnetic wire cuts off each phase winding of the stator in turn, and generates a three-phase alternating current potential in the three-phase stator winding. When the generator operates with a symmetrical load, the three-phase armature currents are combined to generate a rotating magnetic field at synchronous speed. The interaction of the stator magnetic field with the rotor magnetic field will generate a braking torque. From the steam/steam/gas turbine, the mechanical torque input overcomes the braking torque and works.

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