Generator 372.3701: 1 - output "IN" voltage regulator; 2 - voltage regulator; 3 - output "30" generator; 4 - output "61" (common output of additional diodes); 5 - capacitor; 6 - back cover of the generator; 7 - front cover of the generator; 8 - stator; 9 - pulley; 10 - stud fastening the generator to the tension bar
The vehicle has an alternator model 372.3701. It is a three-phase synchronous electric machine with electromagnetic excitation. The generator is mounted on the engine on the right side and is driven by a V-belt from the crankshaft pulley. Through the holes in the eyes of the covers, the generator is bolted to the engine bracket, and with a pin - to the tension bar.
Generator 9412.3701 is installed on some cars, which has a number of design differences: the rectifier unit is placed behind the back cover, the fan impeller is located inside the generator. To reduce brush wear, the slip rings are made of a smaller diameter. Conclusion "B+" alternator is connected to the positive terminal of the battery.
Technical characteristics of generators 372.3701/9412.3701:
Rated voltage, V | 14 |
Maximum recoil current at 13 V and rotor speed 5000 rpm, A | 55/80 |
Power, W | 770/1120 |
Weight, kg | 4,4/4,9 |
The main parts of the generator 372.3701 are the rotor, stator and covers, cast from an aluminum alloy.
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 contact 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.
Generator details 372.3701: 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 - voltage regulator; 15 - rectifier block; 16 - capacitor; 17 - contact bolt; 18 - bolt; 19 - bolt; 20 - inner washer for fastening the bearing; 21 - fan impeller
Generator details 9412.3701: 1 - protective cover of the rectifier unit; 2 - screws for fastening the voltage regulator; 3 - voltage regulator; 4 - rectifier block; 5 - capacitor; 6 - back cover; 7 - stator with windings; 8 - rotor; 9 - front cover; 10 - remote bushing; 11 - pulley; 12 - washer; 13 - spring washer; 14 - pulley fastening nut; 15 - front bearing; 16 - rear bearing; 17 - coupling bolts of covers; 18 - bolts (with insulating gaskets) fastening of the block of rectifiers and conclusions of windings of the stator; 19 - bolt (without insulating pad) fastening of the block of rectifiers; 20 - capacitor mounting screw; 21 - fastening elements of the contact bolt; 22 - remote bushing; 23 - insulating sleeve; 24 - pin bolt
stator assembled from plates of electrical steel 1 mm thick. 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 terminals of the phase windings are connected in a star, while others are connected to pairs of diodes of the rectifier unit.
To convert alternating current to direct current, the generator is built-in rectifier block on six silicon diodes, installed in the rear cover of the generator 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 have a plus on the case (positive diodes), the other three - minus (negative diodes). On the holder of positive diodes there is an output contact bolt "30" generator; also the holder is connected by a wire to the output "IN" voltage regulator. The holder of the negative diodes is connected to the rear cover of the generator - "weight".
Voltage regulator with a brush holder is made as a non-separable unit and is attached with two screws to the rear cover of the generator. It is designed to maintain the nominal voltage in the vehicle's electrical network, regardless of the shaft speed.
Generator wiring diagram 372.3701: 1 - battery; 2 - generator; 3 - mounting block; 4 - switch (lock) ignition; 5 - voltmeter; 6 - battery charge control lamp
Generator wiring diagram 9412.3701: 1 - battery; 2 - generator; 3 - mounting block; 4 - switch (lock) ignition; 5 - voltmeter; 6 - battery charge control lamp
When the ignition is switched on, the voltage to the excitation winding is supplied to the terminal "IN" regulator through the battery charge indicator lamp. After starting the engine, the field winding is powered by three additional diodes located on the rectifier unit. In this case, the current through the charge lamp does not pass and it does not burn. A burning lamp indicates a malfunction in the generator circuit. The outputs of additional diodes are connected to the output "61" generator.
To suppress radio interference, a capacitor is connected to the electrical circuit of the generator, fixed with a screw on the back cover.
Attention! Do not operate the generator 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.