Negative coefficient filter for use with AC motors

Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems

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318615, 318632, 388813, G05B 102

Patent

active

056569084

ABSTRACT:
A method and apparatus to be used with the motor controller for reducing phase shift between the feedback signal and the correction signal. Wherein the feedback signal is compared by the controller to a reference signal to provide the correction signal used to alter motor control signals. The method includes changing a correction signal according to a transfer function to produce a filter signal wherein the transfer function includes two variables: k.sub.n and .omega..sub.n, .omega..sub.n always being greater than zero, and k.sub.n being negative when the feedback signal is phased shifted into a medium frequency range. The method and apparatus produce filtered signals that are phase shifted and amounts determined by the k.sub.n and .omega..sub.n variables. Where k.sub.n is negative, the filtered signal is phase lagged by an extreme degree.

REFERENCES:
patent: 5493192 (1996-02-01), Nihei et al.
patent: 5495158 (1996-02-01), Schmidt et al.
patent: 5514947 (1996-05-01), Berg
patent: 5545957 (1996-08-01), Kubo et al.

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