Vertical asynchronous electric motors of AOВ5A type with squirrel-cage rotor are designed to drive pumps delivered to NPP.


These electric motors meet IEC standards.

The motors are rated for continuous operating mode S1 from AC network, 50 Hz, 6000 V and 10000 V.

The motors are manufactured with frictionless bearings with one shaft end. Bearing lubrication is consistent
Winding insulation of the motor is thermosetting «Monolith-2», it belongs to heat-resistance class “F” by GOST 8865-93, and with temperature usage as class “В”. Temperature excess for motor parts meets GOST R 52776.

The stator winding has six terminals, which go to one terminal box. Phase connection is “star”.  Winding ends are connected in “zero” on one insulator inside the terminal box.

Protection degree of the motor meets IP 54, of the stator input device – IP55, of the outer fan – IP21.
Constructive mounting arrangement – IM 4011 by GOST 2479-79.

The motor shaft is coupled with the pump shaft by flexible coupling, thus axial efforts should not affect on the motor shaft.

Motors are made with right sense of rotation, if you see from side of the working shaft end.

Cooling method – ICA 0151 by GOST 20459-87.

Climatic construction and allocation category is УХЛ4.

The motor designation is decoded as follows:


А – asynchronous
O – blown
В – vertical
5 – number of series
А – for usage at NPP

ХХХ – Rated power, kW
Д – Designation for voltage 10 kV
Х – Number of poles
ХХХ – Climatic construction
Х – Allocation category

Technical data:

Type of the motor Power, kW Rotational speed, rpm Eff., % cos j L, mm Weight, kg Type of the pump
АОВ5А-400-4УХЛ4 400 1485 95,0 0,89 1800 3700 АКсВА 650-135

КЭНА 440-220

АОВ5А-400Д-4УХЛ4 94,3 0,86 1910 3900
АОВ5А-500-4УХЛ4 500 95,0 0,89 1860 3900 АКсВА 1050-100

КЭНА 1050-100

АОВ5А-500Д-4УХЛ4 94,3 0,86 1970 4100
АОВ5А-630-4УХЛ4 630 95,0 0,9 1890 4100 АКсВА 900-180
АОВ5А-630Д-4УХЛ4 94,3 0,86 2000 4300