High-voltage asynchronous motors up to 20 MW, up to 15.75 kV

Description

High-voltage asynchronous motors with squirrel-cage or wound rotor for industrial drives and irrigation pumping stations. The company entered the motor business in 2021, using technologies and a production base developed for generators; manufacturing takes place at the plant in Bangalore (India). Catalogue parameters from the “Synchronous & Induction Machines” brochure: power up to 20 MW, voltage up to 15.75 kV, rotational speed up to 3600 rpm, frequency 50/60 Hz, frame size from 400. Insulation class F or H with temperature rise per class B or F; rolling, sliding or thrust bearings; degree of protection IP23–IP55; cooling open, CACW (air–water) or CACA (air–air). Design horizontal or vertical, for general-purpose and hazardous areas; the motors are suitable for operation from a frequency converter. The moment of inertia (GD²) is calculated for the driven mechanism. The website also cites a wider range for pumping stations: 400–40,000 kW. Stator design: welded steel frame, core of cold-rolled electrical steel with double-sided sheet insulation and radial ventilation ducts, multi-turn winding of copper wire in glass sleeving with epoxy-mica insulation applied by robot, and global vacuum-pressure impregnation. Rotor: squirrel-cage with copper bars and end rings, or wound-rotor with copper winding and slip rings (vacuum impregnation with rotational curing). Shaft of carbon steel, solid or ribbed; banding rings are used on high-speed machines. The motors are designed for heavy starting with high starting torque. Applications: pumps for irrigation and water-supply systems, fans, crushers, compressors, and drives at cement, sugar and metallurgical plants. Example: three 3 MW, 11 kV, 740 rpm wound-rotor motors for a cane fibriser at the Nirani Sugars sugar mill. The manufacturer also builds replacement motors for existing machines of other manufacturers, retaining mounting dimensions.

Technical specifications