A control apparatus for a rotor supported by an electromagnetic bearing

Claim 2

A control apparatus for a rotor supported by an electromagnet bearing, comprising: an X -direction servo circuit including an X-directional displacement detector (3) which detects an X-axial deviation of the rotor (1) from a preset radial position, and a control circuit (4) which generates a signal for controlling the X-axial position of the rotor (1) so as to be held at the preset position, on the basis of an X-directional displacement signal (x) of said displacement detector (3), a Y-direction servo circuit including a Y-directional displacement detector (13) which detects a Y-axial deviation of the rotor (1), and a control circuit (14) which generates a signal for controlling the Y-axial.position of the rotor (1) so as to be held at the preset position, on the basis of a Y-directional displacement signal (y) of said Y-directional displacement detector (13), a rotational frequency-synchronized tracking filter (7) whose center frequency is a frequency corresponding to a rotational speed of the rotor (1), means to apply the X-directional displacement signal (x) to said filter (7) as an input and to additively supply said Y-direction servo-circuit with an X-directional output signal (x N ) delivered from said filter (7) in correspondence with the input signal (x), and means to apply the Y-directional displacement signal (y) to said filter (7) as an input and to subtractively supply said X-direction servo circuit with a Y-directional output signal ( YN ) delivered from said filter (7) in correspondence with the input signal (Fig. 9).

Claim 3

A control apparatus as defined in claim 1, wherein both the X-directional output signal (x N ) and the Y-directional output signal ( YN ) of said rotational frequency-synchronized tracking filter (7) are multiplied by a, and the multiplied signals are.respectively applied to said Y-direction servo circuit and said X-direction servo circuit.

Claim 4

A control apparatus for a rotor supported by an electromagnetic bearing, comprising: an X-direction servo circuit including an X-directional displacement detector (3) which detects an X-axial deviation of the rotor (1) from a preset radial position, and a control circuit (4) which generates a signal for controlling the X-axial position of the rotor (1) so as to be held at the preset position, on the basis of an X-directional displacement signal(x) of said displacement detector (3), a Y-direction servo circuit including a Y-directional displacement detector (13) which detects a Y-axial deviation of the rotor (1), and a control circuit (14) which generates a signal for controlling the Y-axial position of the rotor (1) so as to be held at the preset position, on the basis of a Y-directional displacement signal (y) of said Y-directional displacement detector (13), a rotational frequency-synchronized tracking filter (7) whose center frequency is a frequency corresponding to a rotational speed of the rotor (1), means to apply the X-directional displacement signal (x) to said filter (7) as an input and to additively supply said Y-direction servo circuit with an X-directional output signal (x XF ) delivered from said filter (7) in correspondence with the input signal (x), means to apply the Y-directional displacement signal to said filter (7) as an input and to subtractively supply said X-direction servo circuit with a Y-directional output signal (y NF ) delivered from said filter (7) in correspondence with the input signal (y) . a rotational frequency-synchronized filter (8) of reverse rotation which performs signal processing inverse to that of said rotational frequency-synchronized tracking filter (7), means to apply the X-directional displacement detection signal (x) to said rotational frequency-synchronized filter (8) of reverse rotation as an input and to subtractively supply said Y-direction servo circuit with an X-directional output signal (x) delivered from this filter (8) in correspondence with the input signal (x), and means to apply the Y-directional displacement detection signal (y) to said rotational frequency-synchronized filter (8) of reverse rotation as an input and to additively supply said X-direction servo circuit with a Y-directional output signal (y NB ) delivered from this filter (8) in correspondence with the input signal (y) (Fig. 10).

Claim 5

A control apparatus for a rotor supported by an electromagnetic bearing, comprising: an X-direction servo circuit including an X-directional displacement detector (3) which detects an X-axial deviation of the rotor (1) from a preset radial position, and a control circuit (4) which generates a signal for controlling the X-axial position of the rotor (1) so as to be held at the preset position, on the basis of an X-directional displacement signal(x) of said displacement detector (3), a Y-direction servo circuit including a Y-directional displacement detector (13) which detects a Y-axial deviation of the rotor (1), and a control circuit (14) which generates a signal for controlling the Y-axial position of the rotor (1) so as to be held at the preset position, on the basis of a Y-directional displacement signal (y) of said Y-directional displacement detector (13), a rotational frequency-synchronized tracking filter (7) whose center frequency is a frequency corresponding to a rotational speed of the rotor (1), means to apply the X-directional displacement signal (x) to said filter (7) as an input and to additively supply said Y-direction servo circuit with an X-directional output signal (x XF ) delivered from said filter (7) in correspondence with the input signal (x), means to apply the Y-directional displacement signal to said filter (7) as an input and to subtractively supply said X-direction servo circuit with a Y-directional output signal (y NF ) delivered from said filter (7) in correspondence with the input signal (y) . a rotational frequency-synchronized filter (8) of reverse rotation which performs signal processing inverse to that of said rotational frequency-synchronized tracking filter (7), means to apply the X-directional displacement detection signal (x) to said rotational frequency-synchronized filter (8) of reverse rotation as an input and to subtractively supply said Y-direction servo circuit with an X-directional output signal (x) delivered from this filter (8) in correspondence with the input signal (x), and means to apply the Y-directional displacement detection signal (y) to said rotational frequency-synchronized filter (8) of reverse rotation as an input and to additively supply said X-direction servo circuit with a Y-directional output signal (y NB ) delivered from this filter (8) in correspondence with the input signal (y) (Fig. 10).

Claim 6

A control apparatus as defined in claim 3, wherein both the X-directional output signal (x NF ) and the Y-directional output signal ( YNF ) of said rotational frequency-synchronized tracking filter (7) are multiplied by a, and the multiplied signals are respectively applied to said Y-direction servo circuit and said X-direction servo circuit, and both the X-directional output signal (x NB ) and the Y-directional output signal ( YNB ) of said rotational frequency-synchronized tracking filter (8) of reverse rotation are multiplied by S, and the multiplied signals are respectively applied to said Y-direction servo circuit and said X-direction servo circuit.