Rotors and high-speed electric machines
WELMA high-speed electric machines for dual mode operation as motors and generators.
In the modern world design and application of high-speed electric machines (HSEM) is one of the priority areas in development of power engineering and machine building. Of all the variety of electric machines the most energy-efﬁcient and promising ones are high-speed reversible electric machines with permanent magnet rotors.
Research and Production Company "ERGA" has been developing, manufacturing, bench testing, servicing and repairing high-speed electric machines for more than 10 years. High-speed generators and engines produced under WELMA trademark can be widely used in electric power industry, cryogenic systems, automobile and shipbuilding and aircraft construction.
WELMA high-speed electric generators and motors can be equipped with a power electronics set.
Link of power, rotation speed and stator bore diameter for WELMA synchronous PM-excited high-speed electric machines, with an internal rotor, depending on linear circumferential rotor speed. The region of WELMA high-speed electric machines of small and medium power (5 .. 300 kW) is shaded.
"ERGA" develops and manufactures customized WELMA high-speed electric generators and electric motors with required performances.
Advantages of synchronous WELMA permanent magnet electric machines:
- Simple design, which is explained by the absence of rotor field winding and sliding contact (for machines with electromagnetic excitation contact system);
- Compact sizes and light weight (this advantage increases with a decrease in machine power);
- Fewer losses and, consequently, higher efficiency due to reduced losses for excitation and friction in sliding contact (for machines with electromagnetic excitation contact system);
- Advanced robustness due to the absence of sliding contact and excitation winding;
- No need in DC power supply;
- Eco-friendliness in use (minimum noise).
WELMA high-speed electric machines features:
- Gearless drive for operation with turbine and compressor wheels;
- Priority of noncontact bearing use;
- Possibility of “dry” (oil-free) design due to application of noncontact (gas or magnetic) bearings;
- Smaller HSEM sizes – better mass/volume characteristics.