Generator G221A: 1 - output "67"; 2 - brush holder; 3 - central output of the stator winding; 4 - output "30"; 5 - back cover of the generator; 6 - front cover of the generator; 7 - stud fastening the generator to the tension bar; 8 - pulley; 9 - stator
Technical characteristics of the G-221A generator:
Rated voltage, V |
12 |
Maximum recoil current at 14 V and rotor speed 5000 rpm, A |
42 |
Power, W |
600 |
Weight, kg |
4,28 |
The main parts of the generator are the rotor, stator and covers, cast from aluminum alloy.
G221A Generator Details: 1 - pulley; 2 - segment key; 3 - front cover of the generator; 4 - outer washer for fastening the bearing; 5 - front rotor bearing; 6 - rotor; 7 - coupling bolt; 8 - stator; 9 - rear rotor bearing; 10 - buffer sleeve; 11 - back cover; 12 - insulating bushings; 13 - bolt; 14 - brush holder; 15 - rectifier block; 16 - contact bolt; 17 - bolt; 18 - bolt; 19 - inner washer for fastening the bearing; 20 - fan impeller
Rotor consists of a shaft, on the corrugated surface of which a steel bushing and steel beak-shaped poles are pressed, forming, together with the shaft and the rotor bushing, the core of an electromagnet. The rotor winding is placed on the sleeve between the poles in a plastic frame (excitation winding). The winding leads are soldered to slip rings mounted on a plastic sleeve located on the shaft. At the front end of the rotor shaft, a pulley and an impeller of the cooling fan are fixed with a nut using a segment key. The rotor shaft rotates in two ball bearings mounted in the generator covers. The rear bearing is pressed onto the rotor shaft, and the front bearing is held in the cover with special washers secured with four bolts and nuts.
stator assembled from plates of electrical steel. A three-phase winding is laid in the grooves on the inner surface of the stator. Each winding consists of six coils connected in series. Some of the winding terminals are connected to pairs of diodes of the rectifier unit, while others are connected to the central terminal of the generator, which is connected by a wire to the terminal "85" relay of a control lamp of a charge of the rechargeable battery.
To convert alternating current to direct current, the generator is built-in rectifier block on six silicon diodes, installed in the back cover and fixed to it with three bolts. Diode cases are pressed into two aluminum holders isolated from each other for positive and negative diodes, assembled into a single block. Three diodes are on the body "plus" (positive diodes), the other three are "minus" (negative diodes). On the holder of positive diodes there is an output contact bolt "30" generator. The holder of the negative diodes is connected to the rear cover of the generator - "weight".
The brush holder is fixed with a screw on the rear cover of the generator. One of its brushes is connected to "weight", and the other, through the output "67" generator with voltage regulator.
Voltage regulator designed to maintain the rated voltage in the electrical network of the car, regardless of the speed of the shaft. Via output "15" the regulator is connected to the ignition switch.
Attention! The generator must not be operated with the battery disconnected. This will cause short-term voltages to appear on the output "30" generator, which can damage the generator voltage regulator and electronic devices in the vehicle's on-board network.