GN…N (GNA / AGN / fGN), 100–280 — DC motors with separate (shunt) excitation, up to 230 kW

Description

The GN…N series motors of the manufacturer are classic DC machines with separate (shunt) excitation, intended for variable-speed drives in machine building and heavy industry: printing and paper machines, extruders, winders, rolling mills and other mechanisms where a wide and smooth speed range is required. The machines have four poles and a fully laminated magnetic circuit, which improves commutation when supplied from thyristor converters; the GN…N 100–200 catalogue lists power up to 230 kW. Frame sizes by shaft height are 100, 112, 132, 160, 180 and 200 mm, and the commissioning manuals TAM 00520/00526/00600 also describe larger versions of 225, 250 and 280 mm. Each frame size is produced in several lengths (KN, SN, MN, LN) and in winding variants for armature voltages of 400, 420, 460 and 480 V. For example, the GNA 100 SN delivers from 5 to 18 kW at 2300–4800 rpm, and the GNA 200 LN delivers up to 218 kW at a torque of about 976 N·m, with a mass of 750 kg and efficiency of about 93 %. The standard field voltage is 310 V; 340 V is also permitted, obtained from the bridge circuit at a 400 V grid. Downward control from rated speed is achieved by reducing the armature voltage at constant torque (down to 50 rpm), and upward by field weakening at constant power up to nmax electr. Overcurrent of 1.5 × In for 45 s per EN 60034 is permitted. The letters in the designation indicate the cooling method: GNA means a radial fan on top or at the side, AGN a fan attached axially on side B, and fGN cooling air supplied by ducts (with two-sided connection the degree of protection is IPR44). The basic protection is IP23, insulation class H, temperature rise up to 125 K, and two thermal switches (in an additional pole and in the field winding). Designs IM B3, B35, B5, V1, V3 and others are available, with ball or roller bearings on the drive side for increased radial forces. Options include a disc brake, a DC tachogenerator GHT S 42, a pulse encoder, a silencer (−3 dBA), a stabilizing series winding and brush monitoring. The motors are CE-marked (declaration of conformity for GN) and are designed to work with BKD/BKF DC converters. For the Ukrainian market the series is of interest as a replacement for DC machines of CIS-country manufacture during the modernization of existing DC drives.

Technical specifications