• The radial magnetic bearings is largely divided into Hetero polar type and Homo polar type.
• Magnetar applied Hybrid-Homo Polar Type Radial Magnetic bearing
Hetero Polar Type
(Electromagnet)
Homo Polar Type (Electromagnet)
Hybrid-Homo Polar Type
(Electromagnet +
Permanent Magnet)
Eddy Current Loss
High
Very low
Very low
Rotor Heating
High
Very low
Very low
Manufacturing Static Core
Laminated
Assembled
Assembled
Bias Current
Required
Required
Do not Required
Energy Loss and Static Heating
High
High
Very low
The number of Current Drivers
4
4
2
(*Bias Current : The Current required to make the constant magnetic flux)
• Video : Radial Magnetic Bearing – Levitation & Flux Flow
• Test of Magnetic Bearing Performance and Shaft Structural Strength
- Rotational Speed : 95,000RPM (Rotor Diameter 49mm, Linear velocity of bearing 243.6 m/s) - Completed Rotational test in zero-to-peak several Micrometers level of radial vibration.
