Classification and voltage regulation principle an

  • Detail

Classification of voltage regulator and analysis of voltage regulation principle

classification of voltage regulator

1 According to the working principle, the voltage regulator of alternator can be divided into:

(1) contact voltage regulator

contact voltage regulator has been used earlier. The contact vibration frequency of this regulator is slow, there is mechanical inertia, conversely upward rotation and electromagnetic inertia, the accuracy of voltage regulation is low, the contact is easy to produce sparks, has great interference to radio, poor reliability, short service life, and has been eliminated

(2) transistor regulator

with the development of semiconductor technology, transistor regulator is adopted. Its advantages are: the switching frequency of triode is high, no spark is generated, and the adjustment accuracy is high. It will also provide inexhaustible development power for the extruder industry. It has the advantages of light weight, small volume, long service life, high reliability, low radio interference and so on. It is now widely used in Dongfeng, Jiefang and a variety of medium and low-grade models

(3) integrated circuit regulator

in addition to the advantages of transistor regulator, integrated circuit regulator also has ultra small size, which is installed inside the generator (also known as built-in regulator), reduces external wiring, and the cooling effect has been improved. It is now widely used in Santana. Audi and other tensile tests were carried out on a variety of car models between the upper beam and the moving beam of the main engine

(4) computer controlled regulator

computer controlled regulator is a new type of regulator used in cars now. After the total load of the system is measured by the electric load detector, a signal is sent to the generator computer, and then the engine computer controls the generator voltage regulator to timely connect and disconnect the magnetic field circuit, which can reliably ensure the normal operation of the electrical system, fully charge the battery, and reduce the engine load, Improve fuel economy. Such as Shanghai Buick, Guangzhou Honda and other car generators used this regulator

2. The electronic regulator can be divided into:

(1) internal grounding regulator: the electronic regulator suitable for matching with the internal grounding alternator is called the internal grounding regulator

(2) external ground type regulator: the electronic regulator suitable for matching with the external ground type alternator is called external ground type regulator

in the process of use, for the transistor regulator, it is best to use the regulator specified in the vehicle manual. If other models are used to replace it, except that the nominal voltage and other specified parameters are the same as the original regulator, the substitute regulator must have the same grounding form as the original regulator. Otherwise, the generator may not work normally because the excitation circuit is blocked. The integrated circuit regulator must be dedicated and irreplaceable

voltage regulation principle of voltage regulator

we know from the working principle of the alternator that the effective value of the phase electromotive force generated by the three-phase winding of the alternator

e φ== Ce Ф N (V)

transportation industry plays an important role in human social and economic development

here CE is the structural constant of diesel generator, and N is the rotor speed, Ф It is the magnetic pole flux of the rotor, that is, the induced electromotive force generated by the alternator is directly proportional to the rotor speed and magnetic pole flux

when the speed increases, e φ Increase, the output voltage UB increases. When the speed rises to a certain value (above the no-load speed), the output voltage reaches the limit. In order to make the output voltage UB of the generator no longer rise with the increase of speed, we can only reduce the magnetic flux Ф To achieve. Magnetic pole flux Ф It is proportional to the excitation current if to reduce the magnetic flux Ф That is, reduce the excitation current if

therefore, the working principle of the alternator regulator is: when the speed of the alternator increases, the regulator reduces the magnetic flux by reducing the excitation current if of the generator Ф, Keep the output voltage UB of the generator unchanged

the contact voltage regulator changes the magnetic field current if by opening and closing the contact, connecting and disconnecting the magnetic field circuit; Transistor regulators and integrated circuit regulators use the on and off of high-power triodes to turn on and off the magnetic field circuit to change the size of the magnetic field current if. (end)

Copyright © 2011 JIN SHI