System and method for controlling suspension using a magnetic field

A method of controlling the position of a rotating member suspended using a magnetic field, the method comprising:

• generating a position reference signal in response to a detected position of the rotating member;
• determining an actuator control signal in response to the position reference signal, the actuator control signal including a phase lead introduced in response to a rotational speed of the rotating member;
• and
• adjusting the position of the rotating member in response to the actuator control signal by modifying characteristics of the magnetic field.

A system for controlling the position of a rotating member suspended using a magnetic field, the system comprising:

• at least one sensor that is operable to detect the position of the rotating member, the sensor further being operable to generate a position reference signal in response to the detected position;
• a summer in communication with the at least one sensor and being operable to compare the position reference signal to a targeted position value;
• control logic in communication with the summer and being operable to generate a control output signal in response to the compared position reference signal and targeted position value;
• at least one gain compensator in communication with the control logic and being operable to introduce gain in the control output signal;
• at least one lead compensator in communication with the gain compensator and being operable to introduce phase lead in the control output signal, the amount of phase lead determined in response to the rotational speed of the rotating member;
• and
• at least one actuator responsive to the lead compensator and being operable to adjust the position of the rotating member in response to the control output signal by modifying characteristics of the magnetic field.

A system for controlling a position of a rotating member suspended using a magnetic field, the system comprising:

• at least one sensor operable to detect the position of the rotating member, the sensor further operable to generate a position reference signal based on the detected position;
• a controller in communication with the sensor, the controller operable to generate an actuator control signal in response to receiving the position reference signal, the controller further operable to introduce a phase lead in the actuator control signal, the amount of the phase lead varying with the rotational speed of the rotating member;
• and
• at least one actuator in communication with the controller and being operable to adjust the position of the rotating member in response to the actuator control signal by modifying characteristics of the magnetic field.