Displacement Self-Sensing Method for AMB-Rotor Systems Using Current Ripple Demodulations Combined with PWM Command Signals

The self-sensing magnetic bearing technology offers significant cost savings and the potential advantages for dynamics performance due to its fundamental sensor-actuator collocation. Based on the active magnetic bearing (AMB) driven by a 2-level pulse width modulation (PWM) switch power amplifier, an analog circuit was designed to estimate the rotor position through extracting the fundamental comp...