Active electronic damping for step motor
AssigneeParker-Hannifin Corporation
InventorsJack Nordquist, Mark C. Calahan, Timothy J. Damiano, Christopher M. Botka
Life of this patent
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Abstract
Apparatus for electronically producing a torque dependent signal for a plural drive phase synchronous step motor, without the use of an accelerometer or other external feedback device, includes a circuit for detecting respective instantaneous terminal voltage signals for at least two phases of the motor; another circuit for detecting respective instantaneous phase current signals for said at least two phases; and a signal processing circuit for combining the detected signals to produce said torque dependent signal.
Claims20
A method for electronically producing a torque dependent signal for a plural drive phase synchronous step motor, comprising the steps of:
- a. detecting respective instantaneous terminal voltage signals for two phases of the motor;
- b. detecting respective instantaneous phase current signals for said two phases;
- c. determining respective generator currents for each phase based on said respective instantaneous phase currents and an integration of said respective instantaneous voltage signals;
- and
- d. combining said generator currents and said integration of said instantaneous voltage signals to produce said torque dependent signal.
Apparatus for electronically producing a torque dependent signal for a plural drive phase synchronous step motor, comprising:
- means for detecting respective instantaneous terminal voltage signals for two phases of the motor;
- means for detecting respective instantaneous phase current signals for said two phases;
- and signal processing means for determining respective generator currents for each phase based on said respective instantaneous phase current signals and an integration of said respective instantaneous voltage signals and for combining said detected integration of said instantaneous voltage signal and said generator currents to produce said torque dependent signal.
Apparatus for active electronic damping in a plural drive phase step motor, comprising:
- means for detecting respective instantaneous terminal voltage signals for two phases of the motor;
- means for detecting respective instantaneous phase current signals for said two phases;
- means for determining respective generator currents for each phase based on said respective instantaneous phase current signals and an integration of said respective instantaneous voltage signals and for combining said detected signals to produce a torque dependent signal;
- and feedback means for effecting a desired damping ratio based on said torque dependent signal.
Dependencies are inferred from the claim text.