Voltage regulator classification
An alternator voltage regulator works can be divided into:
(1) contact voltage regulator
Contact voltage regulator applications earlier this regulator contact vibration frequency slow, mechanical inertia and electromagnetic inertia and low voltage regulation accuracy, contacts easy to produce sparks, radio interference, poor reliability, short life, now has been eliminated.
(2) transistor regulator
With the development of semiconductor technology, the transistor regulator. Its advantages are: high switching frequency of the transistor, and does not produce sparks, high regulation accuracy, but also has a light weight, small size, long life, high reliability, small electrical interference, etc., are widely used in Dongfeng, liberation, and a variety of middle and low models.
(3) IC regulator
IC regulator in addition to the advantages of the transistor regulator with ultra-small, internal generator (also known as built-in regulator), reducing the external line, and the cooling effect has been improved, now widely used in Santana . Audi and other car models.
(4) computer-controlled regulator
Computer-controlled regulator is the car uses a new type of regulator by the electric load detector measuring the total system load to the generator computer sends a signal, and then by the engine computer to control the generator voltage regulator in a timely manner turned on and off open magnetic circuit, which can reliably guarantee the normal work of the electrical system, so that the battery fully charged, but also to reduce engine load and improve fuel economy. This regulator such as the Shanghai Buick, Guangzhou Honda car generator.
2 electronic regulator matching alternator Ground type can be divided into:
(1) within the Ground regulator: for electronic matching within the Ground alternator regulator is known as a Ground-type regulator;
(2), Ground-type regulator: suitable for matching with the outside Ground alternator electronic regulator known as the outer grounding-type regulator.
In the course of the transistor regulator, it is best to use the regulator specified in the car manual, if the substitution of other models, in addition to the same outside of the specified parameters such as nominal voltage regulator, alternative regulator must be the primary regulator of Ground the same form, otherwise, generators may be due to the excitation circuit is blocked and can not work properly. IC regulator, must be dedicated, it is not a substitute.
Voltage regulator voltage regulator principle
We know that the alternator works the three-phase winding of the alternator to produce the valid values of the phase emf
The eφ == CeФn (V)
Here Ce generator structure constant, n is the rotor speed, Ф is the rotor pole flux, that is the induced electromotive force generated by the alternator rotor speed is proportional to the magnetic pole flux.
When the speed increases, Eφ increases, the output voltage UB increased when the speed increases to a certain value (no-load speed and above), the output voltage reaches the limit, in order to make the generator output voltage UB is no longer with speed increases and rise, can only be achieved by reducing the magnetic flux Ф. And pole magnetic flux Ф and the excitation current If is proportional to reduce the magnetic flux Ф is to reduce the excitation current If.
Alternator regulator's how it works: When the alternator speed increases, the regulator by reducing the generator excitation current If to reduce the flux Ф, so that the generator output voltage UB remains unchanged .
Through the contacts, the contact voltage regulator switching on and off the magnetic circuit to change the size of the field current If; transistor regulator IC regulator to the use of high-power transistor on and off, switched on and off open magnetic circuit, to change the size of the field current If.
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