Magnetic bearing technology using the principle of magnetic levitation for the rotor to rotate in the state of complete levitation to enable high-speed rotation at 100,000 rpm or faster and highprecision rotation with rotating vibration below 2 μm

 

Client / Market

• Magnetic bearing manufacturer
• Turbo machine (compressor, blower, turbine, pump) company
• High-speed spindle company, ultracentrifuge company
• Precision roller (for printed electronics, nano imprint) manufacturer and application company

 

Necessity of this Technology

• Existing ball bearing has limits regarding high-speed and precision of rotary machine.
• When applying ball bearing for a rotor with a diameter of 50 mm, rotation at up to 30,000 rpm can be achieved.
• In the case of a low-speed precision roller where ball bearing is applied, rotating vibration of 20 to 40 μm occurs.
• To develop a high-speed, high-precision rotary machine with rotating speed over 100,000 rpm and rotating vibration of 2 μm, a magnetic bearing that enables contactless rotation in the state of complete levitation needs to be applied.

 

Technical Differentiation

• Energy efficient magnetic bearing using a permanent magnet and electromagnet
• Homopolar structure to eliminate the high heating issue of heteropolar magnetic bearing
• The volume of entire system reduced by integrating the auxiliary bearing and sensors with magnetic bearing and achieving a shorter length for magnetic bearing
• With a short length for rotor, the primary bending mode frequency can be increased for enhancement of rotation stability at high speed.
• Minimization of usage of the electric current and rotational vibration by applying self-weight compensation and permanent magnet for bias force
• Lubricant is not required because it is contactless and frictionless, and clean bearing of which life time is semi-permanent
• Smart bearing with real-time vibration/load monitoring to cope with dangerous situations

 

Excellence of Technology

• Applied for an ultra-high-speed spindle with rotor with a diameter of 41 mm and achieved rotation speed of 120,000 rpm and linear velocity of 49.2 Mil-DN
• Applied for a low-speed high-precision roller and achieved rotation speed of 30 rpm, and rotating vibration below 2 μm under the condition of 300 N load
• External vibration and load is monitored real-time to detect abnormality in system in advance.

 

Current Intellectual Property Right Status

PATENT

• Turbo Machine Equipped with Magnetic Bearing (KR1287057)
• Magnetic Bearing Using Permanent Magnet and Electromagnet (KR0976631)
• Magnetic Bearing System (KR1133560)
• Magnetic Bearing Structure and Turbo Machine Equipped with this Magnetic Bearing (KR1166854, US9041266, SE536808, CNZL201180013360.X)
• Composite Magnetic Bearing Having Auxiliary Bearing Coupled Thereto (KR1408060, US9273723, CNZL201380006733.X)
• Composite Magnetic Bearing Having Sensor and Auxiliary Bearing Coupled (KR1444139)
• Thrust Magnetic Bearing for Deflecting Force Compensation (KR1552350, US14/674022, CN201510196685.6)
• Roller Module Equipped with Magnetic Bearing and Permanent Magnet (KR1809104, US15/554729, UK1708962.4)

KNOW-HOW

• Ultra-high-speed rotor design, manufacturing technology
• Ultra-high-speed, high-precision magnetic bearing control technology
• Inductive displacement sensor technology
• Real-time vibration, load monitoring and emergency situation handling technology