voltage regulator for the AC generator output voltage remains substantially constant in all operating conditions of the engine, means to meet the requirements of a constant voltage electrical equipment. .
voltage regulator works
by the alternator works we know, the three-phase winding phase alternator electromotive force generated by RMS: Ephi; == CeФn ( V), where Ce is the structure of the generator constant, n is the rotor speed, the rotor flux [Phi] of the magnetic poles, i.e. alternator induced electromotive force generated is proportional to the rotor speed and the magnetic pole magnetic flux.
When the speed increases, Ephi; increases, the output voltage UB increases, when the speed increases to a certain value (load speed or more), the output voltage reaches the limit, in order to make the generator the output voltage UB no longer rises with the speed rises only be achieved by reducing the magnetic flux [Phi]. And Ф pole flux is proportional to the field current If to reduce the magnetic flux is reduced Ф field current If.
Therefore, the working principle of the alternator regulator that: when the rotational speed of the alternatorWhen raised, the magnetic flux Ф regulator reduced by reducing the generator field current If, the output voltage of the generator UB remains unchanged. Contact voltage regulator contact opened and closed by switching on and off the field circuit, the field current If is changed size; regulator transistor, IC regulators, etc. The use of high-power transistor is turned on and off, turning on and off open magnetic circuit, the size of the field current If is changed. .
2 Classification and Features
1, matched by the electronic regulator alternator Ground pattern can be divided into:
(1) Ground Type regulator: Ground adapted to the type of alternator matching the electronic governor called Ground regulator;
(2) regulator Ground: Ground is adapted to the outer alternators matched called electronic governor outer Ground regulator.
2, the alternator voltage regulator can be divided according to the principle:
(1) Contact voltage regulator
Contact voltage regulator application of more earlier, this vibration frequency regulator contacts slow, there is a mechanical and electromagnetic inertia of the inertia, low precision voltage regulation, the contacts easy to produce sparks, a large radio interference, poor reliability, short life, is now eliminated.
(2) the IC regulator
In addition to the advantages of the IC regulator having a regulator transistor, having a further ultra-small, is attached to the inside of the generator (also called a built-in regulator ), reducing the external line, and the coldBut the effect has been improved, now widely used in Santana. Audi and other car models on. But for the IC regulator, it must be unique, and can not be replaced.
(3) transistor regulator
As semiconductor technology, using the transistor regulator. Its advantages are: a high frequency switching transistor, and does not produce sparks, high precision adjustment, further having a light weight, small size, long life, high reliability, small radio wave interference, etc., it is widely used in the east, and the liberation of more middle and low models.
During use, the regulator for the transistor, is preferably used car regulator specified in the description, if other alternative models, in addition to the same predetermined nominal voltage and other parameters of the original regulator, the regulator Replacement It must be the same as the original form of the regulator to ground, otherwise, the generator may fail due to the exciting circuit fails.
(4) computer-controlled regulator
Computer-controlled regulator is now the cars are used in a new actuator, the electric load detected by the total load measurement system, the computer transmits to the generator signal, and then by the engine control computer generator voltage regulator, in a timely manner on and off the field circuit, which can ensure reliable electrical system is working properly, the battery has a sufficient charge, but also to reduce engine load and improve fuel economy. Such as the use of such a regulator on the Shanghai Buick, Guangzhou Honda generator cars.