MÁV series V44
| MÁV series V44 | |
|---|---|
 photography
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| Numbering: | V44.001-002 |
| Number: | 2 |
| Manufacturer: | Ganz & Cie , Budapest |
| Year of construction (s): | 1940-1943 |
| Retirement: | around 1953 |
| Axis formula : | 2'Do2 ' |
| Type : | Kandó with period converter |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 17,640 mm |
| Height: | 4,650 mm |
| Width: | 3,100 mm |
| Total wheelbase: | 14,070 mm |
| Service mass: | 144 t |
| Friction mass: | 72 t |
| Wheel set mass : | 18 t |
| Top speed: | 125 km / h |
| Continuous output : | 2,944 kW (4,000 hp) |
| Driving wheel diameter: | 2,400 mm |
| Impeller diameter: | 1,040 mm |
| Power system : | 15 kV 50 Hz |
| Power transmission: | with phase converter and period converter |
| Number of traction motors: | 4th |
| Drive: | Single axle drive |
| Brake: | Handbrake air brake |
| Particularities: | first locomotive with phase converter and single-axle drive for the MÁV |
The MÁV series V44 were electric locomotives with single-axle drive of the Hungarian state railway MÁV . They were the first single-axle electric locomotives to work according to the Kandó system .
history
The Kandó locomotives of the V40 and V60 series had proven themselves in operation. The high maintenance costs for the rod drive were negative . Following international suggestions, the MÁV converted their electric locomotives to single-axle drives. This required a new system for the electrical control of the locomotive, because the smaller electric motors could no longer regulate the required synchronous speeds by changing the number of poles. The brush holders for it could no longer be spatially accommodated.
In this series with single-axis drive, the synchronous speeds were achieved by changing the frequency of the supply current using a period converter. In 1939 the MÁV ordered two locomotives to be built according to this system. The first was completed by Ganz & Cie in 1943 . In test drives over 15,000 km, the locomotive was able to satisfy. Due to the course of the war, it no longer came into regular operation.
The locomotive was too difficult to handle and too heavy to operate, so that apart from the second ordered locomotive, no further order was placed. This second V44 002 locomotive was destroyed in a bomb attack after it was completed. The first locomotive was shut down in Aszód due to increasing air raids . There it was damaged. This and the construction of the period conversion, which was still in need of improvement, meant that both locomotives were retired and scrapped by 1953.
Technical specifications
Outwardly, the locomotive looked very elegant and resembled the DR class E 19 in its appearance . Due to the heavy electrical equipment with the additional period converter, four running axles were required for the four driven axles, which were arranged in two bogies . It is not known how the single-axle drive was practiced.
What was new in the electrical equipment was that, in addition to the phase converter of the Kandó locomotives, the locomotive was equipped with a period converter, which, like the phase converter, combined a high-voltage synchronous motor and a three-phase generator into one machine unit and supplied the traction motors with three-phase current at various frequencies .
The period converter worked at a speed of 1,500 min −1 . He achieved the four required frequencies by switching the windings with a different number of poles. The four traction motors, designed as squirrel cage motors, could be fed with three-phase current of 0… 83 s −1 from this period converter . The period converter allowed the locomotive to operate at four synchronous speeds of 25, 75, 100 and 125 km / h. The speed of 50 km / h could be achieved if the motors were controlled directly by the phase converter.
The entire electrical equipment turned out to be too heavy and awkward to operate, so that after the Second World War the Ganz works constructed a new phase converter, which ultimately led to the development of the MÁV V55 series .
See also
literature
- Mihály Kubinszky (ed.): Hungarian locomotives and railcars . Akadémiai Kiadó, Budapest 1975, ISBN 963-05-0125-2 .
Web links
- technical description of the MÁV series V44 (Hungarian)
- Technical description of the MÁV series V 44 on a PDF from Ganz (Hungarian)
Individual evidence
- ^ Hungarian website about the V44 series locomotives
- ↑ a b Mihály Kubinszky (ed.): Hungarian locomotives and railcars . Akadémiai Kiadó, Budapest 1975, ISBN 963-05-0125-2 . , Page 304