Multi-hybrid Active Magnetic Bearing Design for Milling Spindle Applications

Abstract

Active magnetic bearings (AMBs) have been gradually developed and used in industrial applications. For a milling spindle system with full magnetic support, at least one axial AMB and two radial AMBs should be included. As a result, the milling spindle dimensions will probably be too large for the application of machine tools. A multi-hybrid AMB design, in which one axial AMB, one radial AMB, and a permanent magnet (PM) are combined, is reported in this work. The PM is embedded for axial suspension for the rotor weight so that the force requirement and the dimensions of the axial AMB can be reduced. On the other hand, magnetic channels were specially designed to couple the three magnetic loops generated by the AMBs and PM instead of isolating these magnetic fluxes individually. The proposed design is also suitable for applications of robot arm joints, such as waist and shoulder joints, to improve the bearing lifetime under heavy loads and to actively regulate the joint position deviation. The proposed multi-hybrid AMB design was practically manufactured after intensive analyses and verified by practical tests.

Radial 4-DOF decoupling control of active magnetic bearing

“…Magnetic bearing is widely used in the mechanical industry, such as various types of machine tools, turbine generators, aero engines, artificial heart pumps, etc [1] . Due to the elimination of friction loss, magnetic bearings use less energy, have a longer lifespan, and may operate at a higher speed than regular bearings [2] . Yet, the control system of magnetic bearing is frequently intricate, and the control effect has a decisive influence on the AMB's operating performance [3] .…”

Study on virtual zero power of maglev left ventricular assist device

“…Magnetic suspensions are widely used in fields such as space technology, advanced manufacturing, and biological manufacturing technology [1,2,3,4,5]. Magnetic suspensions are realized using an active magnetic bearing (AMB) [6,7], passive magnetic bearing (PMB) [8,9,10], or hybrid magnetic bearing (HMB) [11,12].…”

Investigation of a 2-DOF Active Magnetic Bearing Actuator for Unmanned Underwater Vehicle Thruster Application

“…Dhayani et al [24] utilized optimized fuzzy-PID controller for AMB stabilization and the controller performance is compared with conventional controllers. Lee et al [25] proposed a hybrid type AMB design for robotic arm and milling spindle application. However, PID control strategy is employed for stabilization.…”