The main parts of the generator are the stator 19 with two covers and made of aluminum alloy, tightened with four bolts, and the rotor with winding 18. The rotor rotates in two ball bearings 6 and 16 of a closed type. Lubricant is placed in the bearings during their manufacture and does not require replenishment during operation. The inner race of the bearing 16 together with the distance ring 15 is clamped between the pulley hub and the shaft flange using the pulley fastening nut.
The generator rotor is driven into rotation by pulley 13 using a V-belt drive from the crankshaft pulley. The rotor consists of shaft 7, onto which a steel bushing and steel beak-shaped poles 14 and 21 are pressed, forming together with the shaft and bushing the core of the electromagnet. On the steel bushing between the beak-shaped poles in a plastic frame, a winding 18 of the rotor, called the excitation winding, is wound. The ends of the winding are connected to contact rings 5, installed on a plastic shoe pressed onto the rotor shaft.
Current is supplied to the excitation winding through brushes 11 and 12, pressed by springs to the contact rings. The brushes are made of a copper-graphite mixture and are located in a plastic brush holder 10. One of the brushes is connected to the generator body, and the other to the "67" plug.
The stator 19 is assembled from 1 mm thick electrical steel plates. The plates are connected by electric welding. On the inner side of the stator there are 36 semi-closed grooves, insulated with varnish or electrically insulating cardboard. In these grooves a three-phase winding 20 is laid, secured from falling out with wooden wedges or plastic tubes. Each phase winding consists of six continuously wound coils. The phase windings are connected in a star with terminal 9 of the zero point. The relay of the control lamp of the accumulator battery charge is connected to it.
The alternating voltage induced in the stator winding is converted into direct voltage by a rectifier assembled on six silicon valves of the VA-20 type using a three-phase bridge circuit. In order to simplify the fastening details of the rectifier, three valves have a plus of the rectified current on the housing (these are valves of direct polarity - positive), and three valves have a minus of the rectified current (valve of reverse polarity - negative).
Negative valves 5 (marked with black paint) are pressed into the cover of the generator 1, and the positive (marked with red paint) — into a special radiator plate 2, secured with screws 4.
On some generators, a rectifier block is installed, consisting of two plates with valves pressed into them.
The connection diagram of the generator set is shown in Fig. 153.
Fig. 153. Generator set connection diagram:
1 - battery; 2 - generator; 3 - voltage regulator; 4 - ignition switch; 5 - fuse box; b - charge indicator lamp; 7 - charge indicator lamp relay.
Brief technical characteristics of the generator:
- Maximum output current at 14 V and rotor speed of 5000 rpm, A — 42
- Maximum rotor speed, rpm - 13,000
- The gear ratio between the crankshaft and the generator is 1:2.04