Auto electrical there are two key parts, one is the generator, is responsible for the automobile power supply; Another is the starter, is responsible for the car started. The motor has a magnetic field and the armature and rectifying element, but the former is to convert mechanical energy into electrical energy, which converts electrical energy into mechanical energy, and the structure of the two is have very big difference. Previous auto generator is a dc generator, commutator rectifying, since the 1970 s have been ac induction motor phased out, now auto generator is mostly alternator, with semiconductor rectifier. It has small volume, big power, long life, low malfunction and low-speed rechargeable performance is good. Alternator is divided into two parts, the stator winding and rotor winding three-phase stator winding Angle of 120 degrees of electricity distribution according to the differences in the shell, rotor winding is composed of two pieces of a claw. When the rotor winding is connected to a direct current is exciting, two pieces of a claw form N pole and S pole. Magnetic field lines from the N pole through the air gap into the stator core back to the adjacent S pole. Once the rotor rotation, the rotor winding will cut lines, mutual difference 120 KWH in stator winding sine electromotive force, the Angle of the three-phase alternating current (ac), through the six of silicon diode rectifier components into a dc output. Due to the generator output voltage would rise along with the engine speed increases, so to use voltage regulator to adjust, make it perfect for use. Modern car generator are relatively compact, integrated circuit regulator into a generator built-in into an organic whole, and USES the manifold forms. For example, the xiali car generator has eight semiconducting tubes, six rectifier used only, the other 2 is used only for three-phase neutral point voltage rectifier output, in order to improve the power generator.
Modern cars have been widely used air conditioning device, efi engine, electric Windows, electric adjustable seat and so on. The car is advanced, the greater the power consumption. Now the senior car power generator is generally up to 1 kw. With the improvement of automation comfortable change, power consumption will increase, but the installation of the car space is limited, can't increase the volume increase power. Therefore, engineers on the cooling and the installation location. Install the generator in the top of the engine, for example, try to move away from heat; The before and after the end of the generator is put on the fan blade, to enhance the cooling effect. BMW recently is water cooling way to try to improve the cooling effect of the generator. Starter motor, drive mechanism and operating mechanism, etc. Special start the engine, it needs strong torque, so want to through the flow of electricity is very big, hundreds of ampere, this feature determines it is different from the generator. For example, USES the function of a excited dc motor, rotor and stator of was fairly thick rectangular section of copper wire winding; Driving mechanism adopts gear structure; Operating mechanism adopts the electromagnetic magnet method. Motor by the magnetic field (stator), the armature (rotor) and the commutator, in order to increase torque using multipole magnetic field, there are four common magnetic field. When a current flows through the armature coil, in accordance with the "left hand rule", the coil will be affected by a torque and rotation. Due to the direct current motor after electrify creates a counter electromotive force, and is proportional to the engine speed, and is inversely proportional to the torque, therefore can meet the requirements of the engine starting. Starter motor starting current is very big, therefore, the operation start time must be short. Reduction gear mechanism of drive gear and the engine flywheel joint and start the engine, using one-way drive mode. www.dongfeng-motor.com When the small gear on the motor speed is higher than the speed of the engine flywheel ring gear, motor drive the engine, three phase induction motor when the engine speed is higher than the motor, the power transfer relationship between them automatically. Small gear is a little stress is large, a faulty car start will be very difficult.
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