US 6,211,640 B1Granted

Motor drive control system

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorsYoshihiro Fujisaki, Shinichi Emura

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Abstract

A motor control unit (1) includes a white noise generator (8), an instruction switch (9) for switching between an input control instruction (Vins) and a white noise output of the white noise generator (8), a controller (10) for feedback controlling the motor drive velocity, a detection unit (13) for detecting and sampling the real velocity of a motor or a load at a predetermined period, a first Fourier transformer (15) for Fourier-transforming the control instruction data (Cins) together with the sampled velocity data (Vm), and a first frequency characteristic operation unit (16) for calculating the frequency characteristics in a range from the velocity instruction (Cins) to the sampled velocity (Vm) based on output data of the first Fourier transformer (15), thus obtaining the frequency characteristics in a short period without necessity of a servo-analyzer.

Claims11

Dependent claims

A motor drive control system in which a motor drive unit receives an input drive control instruction signal to drive a motor and a load connected thereto under controlling the motor drive, said motor drive control system comprising:

a white noise generator generating a white noise;
an instruction selecting unit for selecting one of the input drive control instruction signal for normal control operation and the white noise generated by the white noise generator for frequency characteristic operation, as a control instruction data signal;
a controller controlling a motor drive using the control instruction data signal output of said instruction selecting unit;
a sampling unit sampling data representing a driving state of one of the motor and the load at a predetermined sampling period to generate sampled data;
a first Fourier transformer for Fourier-transforming the control instruction data output of said instruction selecting unit together with the sampled data obtained by said sampling unit;
and
a first frequency characteristic operation unit for calculating frequency characteristics in a range from the control instruction data to the sampled data based on output data of said first Fourier transformer.

4 more elements

Dependencies are inferred from the claim text.