System and method for controlling suspension using a magnetic field
First Claim
1. 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 controller in communication with the at least one sensor and being 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 in response to a 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.
1 Assignment
0 Petitions
Accused Products
Abstract
A system for controlling the position of a rotating member suspended using a magnetic field includes 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. The system also includes a controller in communication with the at least one sensor and being operable to generate an actuator control signal in response to receiving the position reference signal. The controller is operable to introduce a phase lead in the actuator control signal in response to a rotational speed of the rotating member. The system further includes at least one actuator in communication with the controller that is operable to adjust the position of the rotating member in response to the actuator control signal by modifying characteristics of the magnetic field.
120 Citations
25 Claims
-
1. 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 controller in communication with the at least one sensor and being 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 in response to a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
a memory operable to store control equations; and
a processor operable to access the memory and use the control equations to generate the actuator control signal in response to receiving the position reference signal, the processor further operable to introduce the phase lead in response to the stored control equations.
-
-
3. The system of claim 1, wherein the controller includes a notch filter that is operable to introduce the phase lead in the actuator control signal in response to the rotational speed of the rotating member.
-
4. The system of claim 1, wherein the controller includes a lead compensator that is operable to introduce the phase lead in the actuator control signal over a selected frequency range of the actuator control signal.
-
5. The system of claim 1, wherein the controller includes a tracking lead compensator that is operable to adjust a maximum phase lead frequency in response to the rotational speed of the rotating member.
-
6. The system of claim 1, wherein the controller includes feedforward compensation logic that is operable to compensate for currents caused by runout.
-
7. The system of claim 1, wherein the controller includes a plurality of notch filters that are operable to reduce harmonics of control currents.
-
8. The system of claim 1, wherein the rotating member is a flywheel suspended using magnetic bearings created by the magnetic field.
-
9. 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
correcting for runout error;
determining a difference between the position reference signal to a targeted position value;
transforming the determined difference to reference center of mass coordinates;
generating a control output signal from the transformed difference;
introducing gain compensation in the control output signal in response to the rotational speed of the rotating member;
introducing lead compensation in the control output signal in response to the rotational speed of the rotating member; and
transforming the compensated control output signal into actuator control signals.
-
-
17. 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. - View Dependent Claims (18, 19, 20)
-
-
21. 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. - View Dependent Claims (22, 23, 24, 25)
-
Specification