US 5,900,709 A · Rotation control device

Abstract

In a rotation detection apparatus, a magnetism pattern section provided with plural magnetic poles and a FG (frequency generating) pattern section provided with plural toothed wire circuits are located so as to face each other. When either one of the magnetism pattern section and the FG pattern section is rotated together with a rotating member, plural wave signals are electrically induced in the plural toothed wire circuits. A signal processing cicuit synthesizes the plural wave signals so as to output a multiplication signal and detects the rotation of the rotating member based on the multiplication signal.

Claims24

Dependent claims

An apparatus for detecting rotation of a rotating member having an axis of rotation, comprising:

a magnetism pattern section in which plural magnetic poles are arranged coaxially with the rotating member on a plane;
a FG (frequency generating) pattern section including plural toothed wire circuits arranged coaxially with the rotating member on a plane in which a tooth arrangement of each toothed wire circuit is circularly deviated from others, wherein the magnetism pattern section and the FG pattern sections are located so as to face each other and either one of the magnetism pattern section and the FG pattern section is rotated together with the rotating member so that plural wave signals are electrically induced by the plural toothed wire circuits and each wave signal having a frequency and a different phase from others in accordance with the circular deviation in the teeth arrangement;
and
signal processing means for synthesizing the plural wave signals so as to output a multiplication signal having a multiplied frequency and for detecting the rotation of the rotating member based on the multiplication signal.

1 more element

An apparatus for controlling rotation of a rotating member by detecting a rotating condition based on plural detection signals which are generated in accordance with the rotating condition of the rotating member and provided with phase difference, comprising:

a clock generating means for generating a standard clock signal with a prescribed frequency,
a clock delay means for generating a delay clock signal obtained by delaying the standard clock signal in accordance with a predetermined phase difference,
a rotation detection signal generating means for determining one of the plural wave signals as a standard signal, for detecting a phase difference between the standard clock signal and the standard signal, for further detecting a phase difference between the delay clock signal and another one of the plural wave signals, and for generating the rotation detection signal showing a rotating condition of the rotating member in accordance with the detected phase difference, and
a first controller for controlling the rotation of the rotating member in accordance with the rotation detection signal.

1 more element

a phase error detection means for measuring a phase difference between the plural wave signals and for detecting a phase error between a predetermined phase difference and the measured phase difference;
correcting means for outputting a correction signal based on the phase error detected by the phase error detection means;
and
a second controller for controlling the rotation of the rotating member in accordance with the correction signal,
wherein the phase error detection means comprises:
a pulse signal generating means for generating plural multiplication pulse signals from the plural detection signals;
a measuring means for measuring a first interval from a rise-up phase to a fall-down phase of the pulse signal and a second interval from the fall-down phase to the next rise-up phase;
and
a deviation amount detection means for obtaining a deviation amount from a pulse condition of a duty ratio 50% of the pulse signal;
and
wherein the correcting means corrects the pulse signal based on the deviation amount from the pulse condition of the duty ratio 50% of the pulse signal.

8 more elements

a phase error detection means for measuring a phase difference between the plural wave signals and for detecting a phase error between a predetermined phase difference and the measured phase difference;
correcting means for outputting a correction signal based on the phase error detected by the phase error detection means;
and
a second controller for controlling the rotation of the rotating member in accordance with the correction signal,
wherein the phase error detection means comprises:
a standard phase error calculating means for determining one of the plural wave signals as a standard phase detection signal and for calculating a standard phase difference corresponding to a number of the plural wave signals on the basis of a frequency of the standard phase detection signal;
a phase difference calculating means for calculating a phase difference between the standard phase detection signal and the other wave signals than the standard phase detection signal;
and
an error calculating means for calculating an error in the phase difference of the other wave signals for the standard phase detection signal from the standard phase difference and the calculated phase differences, and
wherein the correcting means corrects the phase of the other wave signals in accordance with the error in the phase difference.

7 more elements

Dependencies are inferred from the claim text.

Abstract

Claims24

Dependent claims

An apparatus for detecting rotation of a rotating member having an axis of rotation, comprising:

a magnetism pattern section in which plural magnetic poles are arranged coaxially with the rotating member on a plane;
a FG (frequency generating) pattern section including plural toothed wire circuits arranged coaxially with the rotating member on a plane in which a tooth arrangement of each toothed wire circuit is circularly deviated from others, wherein the magnetism pattern section and the FG pattern sections are located so as to face each other and either one of the magnetism pattern section and the FG pattern section is rotated together with the rotating member so that plural wave signals are electrically induced by the plural toothed wire circuits and each wave signal having a frequency and a different phase from others in accordance with the circular deviation in the teeth arrangement;
and
signal processing means for synthesizing the plural wave signals so as to output a multiplication signal having a multiplied frequency and for detecting the rotation of the rotating member based on the multiplication signal.

1 more element

a clock generating means for generating a standard clock signal with a prescribed frequency,
a clock delay means for generating a delay clock signal obtained by delaying the standard clock signal in accordance with a predetermined phase difference,
a rotation detection signal generating means for determining one of the plural wave signals as a standard signal, for detecting a phase difference between the standard clock signal and the standard signal, for further detecting a phase difference between the delay clock signal and another one of the plural wave signals, and for generating the rotation detection signal showing a rotating condition of the rotating member in accordance with the detected phase difference, and
a first controller for controlling the rotation of the rotating member in accordance with the rotation detection signal.

1 more element

a phase error detection means for measuring a phase difference between the plural wave signals and for detecting a phase error between a predetermined phase difference and the measured phase difference;
correcting means for outputting a correction signal based on the phase error detected by the phase error detection means;
and
a second controller for controlling the rotation of the rotating member in accordance with the correction signal,
wherein the phase error detection means comprises:
a pulse signal generating means for generating plural multiplication pulse signals from the plural detection signals;
a measuring means for measuring a first interval from a rise-up phase to a fall-down phase of the pulse signal and a second interval from the fall-down phase to the next rise-up phase;
and
a deviation amount detection means for obtaining a deviation amount from a pulse condition of a duty ratio 50% of the pulse signal;
and
wherein the correcting means corrects the pulse signal based on the deviation amount from the pulse condition of the duty ratio 50% of the pulse signal.

8 more elements

a phase error detection means for measuring a phase difference between the plural wave signals and for detecting a phase error between a predetermined phase difference and the measured phase difference;
correcting means for outputting a correction signal based on the phase error detected by the phase error detection means;
and
a second controller for controlling the rotation of the rotating member in accordance with the correction signal,
wherein the phase error detection means comprises:
a standard phase error calculating means for determining one of the plural wave signals as a standard phase detection signal and for calculating a standard phase difference corresponding to a number of the plural wave signals on the basis of a frequency of the standard phase detection signal;
a phase difference calculating means for calculating a phase difference between the standard phase detection signal and the other wave signals than the standard phase detection signal;
and
an error calculating means for calculating an error in the phase difference of the other wave signals for the standard phase detection signal from the standard phase difference and the calculated phase differences, and
wherein the correcting means corrects the phase of the other wave signals in accordance with the error in the phase difference.

7 more elements

Dependencies are inferred from the claim text.

Rotation control device

Life of this patent

Abstract

Claims24

Rotation control device

Life of this patent

Abstract

Claims24