The technology which possesses the real heart!
Even after 100 years, the standard of energy machine will be the KTurbo

The second industrial revolution is being realized by KTurbo with the 5 core technologies such as the air foil bearing, the impeller with precision casting, the capability of aerodynamic technology high velocity motor with high efficiency and inverter

Air Foil Bearing

The air bearing of Kturbo which is operated without mechanical friction and lubricant is the first semi-permanent and none-oil feeding lubricating system of the world. The rotation shaft is floated by the pressure which is converted from the air flow, generated during the rotaion of shaft, between the bearing and shaft, and it also performs the fuction of lubrication as well. In the case of this core technology, electric power is transmitted th the shaft without mechanical friction, therefore, high system efficiency without noise is provided as well as semi-permanent lif of durability

Impeller

The impeller of Kturbo with the most advanced aerodynamic system is identical with the leading technology of aeronautical engineering. Compared to existing aluminum impeller, it has semi-permanent life, and provides, higher pressure with great strength, and has high efficiency. High efficiency imperllers are directly produced with the process and casting equipment in which high level of technologies are combined

PM Motor

From 5,000 to 200,000 rpm, and from 5 to 600 hp, Ktrubo is proud of the high velocity motor with 97% of high efficiency. Separate starting board is not required as it can be started with the current of 5% level of the rated current. In addition, accurate control can be accomplished under the environment of the motor with high temperature by applying the sensor-less drive technology

Technical Level

- support up to 90 kg of weight
- Rotating speed reaches over 50,000 RPM
- applied on 3,000 products for 10 years

What is the foil bearing ?

- Foil bearing uses air rather than oil for lubrication. Its advantages are flexibility and cost effectiveness
- Foil bearings in the field of aeronautical engineering have been used for ACM (Air Cooling Machine) which is the core component to control pressure and temperature inside of aircraft cabins since 1970's. The foil bearing without any oil system does not contaminate inside of the cabin and makes for a stable long term operation without maintenance. Furthermore, even if it is broken, the other turbo elements are not damaged. Foil bearings used for Boeing 747 operate for more than 100,000 hours without maintenance

Comparison of bearings

Design through 3 dimensional flow analysis

Modified lost wax method can produce any complicated shaped goods at lower cost than conventional machining cutting method

Impeller Balancing & Over speed Test

Accurate dimension and good roughness by lost-wax method

Impeller with wall thickness of 0.3 mm can be cast

Technical Level : manufacturing 400HP class motor/inverter

PM(permanent magnet) PM motor uses a permanent magnet rotor, and moves by the electromagnetic rotating force from the stator. It is similar to the small DC motor whose brushes and commutator are replaced with transistors or similar electric switch

Features of KTurbo motor and inverter

VFD (Variable Frequency Drive)
The world largest capacity (300kW class)
Small starting current (below 10% of rated value)
High efficiency (95~97%)
High speed (up to 65,000 rpm)
Maintains high efficiency at partial loading condition
Sensor less drive (high temperature reliability)

Comparison of motors