Right from the beginning we have high performance slow-running motors for the metal industry in our delivery program. After direct current motors having dominated for a long time, today dynamic, high-quality three-phase motors are used: for larger torques as synchronous machines as solid pole versions, for smaller torques as asynchronous squirrel-cage motors. The mechanical construction is designed for high loads in rolling mill operation; equally the electromagnetic dimensioning fulfils the requirements of overloads, adjusting range and control dynamics. The cooling is predominantly reliant on air-to-water heat exchangers.
We supply motors for hot and cold rolling mills for reversal stands in single and twin assembly, for edgers, finishing and tandem mills in single and duo or quarto assembly for reeling, shear and auxiliary drives.
Asynchronous motors with squirrel-cage rotor:
| Torque | 5 – 120 kNm |
| Number of poles | 6-, 8- to 16-pole |
Synchronous motors – solid pole rotors:
| Torque | 10 – 2,200 kNm |
| Number of poles | 6-, 8- to 30-pole |
| Voltage range | 690 – 6,000 V |
| Cooling types | air/water, air/air |
| Types | IM B3 and IM 7115 and modifications |
| Bearing | Rolling or friction bearings |
| Frequency | Converter operation |
The chemical and petrochemical plants require the employment of explosion-proof motors – dependent on the hazard potential (zone 1 and zone 2). At present we provide the ignition protection classes Increased Safety “e” and “n” (non sparking) (zone 2) for our low and medium capacity motors; our motors with high to extremely high capacity, as well as all synchronous motors, have the ignition protection class Pressurized enclosure “p“.
Special requirements must be taken into consideration with regard to certain chemical procedures, such as equipment for ammonia synthesis as an example, to ensure the avoidance of copper and cupreous alloys on the external construction of the motors. VEM motors are adapted to suit the special requirements of chemical processes. We supply motors for compressors, extruders, fans, mixers and pumps.
Asynchronous motors with squirrel-cage rotor:
| Power range | 500 – 14,000 kW |
| Number of poles | 2-, 4-, 6-, 8- to 16-pole |
Synchronous brushless salient pole motors:
| Power range | 5,000 – 42,000 kW |
| Number of poles | 4-, 6-, 8- to 36-pole |
| Voltage range | 690 – 13,800 V |
| Cooling types | air/water, air/air |
| Types | IM B3 and IM 7115 and modifications |
| Bearing | Rolling or friction bearings |
| Frequency | Mains and converter operation |
Large infrastructure projects in the “boom regions“ are leading to a strongly growing demand for building materials such as cement, steel and non-ferrous metals which in turn results in a constant demand for an increase in efficiency for the development and processing procedures in view of finite resources. The mining industry is also developing rapidly at present, since the supply of iron and non-iron ores in sufficient quantities is a requirement for the production of various final products.
Large amounts of these resources are broken, milled, transported, sighted and burned; dust, heat and mechanical loading leads to high requirements on the motors which VEM supplies for crushers, mills, fans, furnaces or conveyor plants.
Asynchronous motors with slip-ring rotors are especially suitable for the heavy start-up conditions for mills and crushers under full load and for fans with very large mass-moments of inertia. Cooling takes place primarily with air-to-air heat exchangers and separate ventilation of the slip ring area.
Asynchronous motors with squirrel-cage rotor:
| Output range | 500 – 20,000 kW |
| Number of poles | 4-, 6-, 8- to 16-pole |
Asynchronous motors with a slip-ring rotor:
| Output range | 500 – 10,000 kW |
| Number of poles | 4-, 6-, 8- to 16-pole |
Synchronous salient pole motors:
| Output range | 2,000 – 20,000 kW |
| Number of poles | 4-, 6-, 8- to 36-pole |
| Voltage range | 690 V to 13,8 kV |
| Cooling types | Air-to-air or air-to-water heat exchanger |
| Types | IM B3 and IM V1, IM7315 and modifications |
| Bearing | Rolling or friction bearings |
| Frequencies | Mains or converter operation |
Conventional power stations, reliant on fossil sources of energy, form the basic supply and reserve for the supply of electric power and stable line operation. Keeping the environment and resources in view, combustion and exhaust gas systems must be optimized further.
VEM motors, designed and built according to ZLM standardization, contribute to fulfilling the requirements for monitoring carbon emissions and also air pollution control of power plants. We supply motors, amongst other things, for boiler feeding, main cooling-water and absorber pumps as well as for oxi-compressors, coal mills and induced draught fans.
