Method and apparatus for controlling an electric motor with comp

Details Method and apparatus for controlling an electric motor with comp Method and apparatus for controlling an electric motor with comp

1994-07-29

1995-11-21

Martin, David S.

Electricity: motive power systems

Constant motor current, load and/or torque control

318632, 318799, 318610, 388815, 388902, 3889075, 388930, H02P 700

Patent

active

054692156

ABSTRACT:
An electric motor control system compensates torque ripples to control the rotation of an electric motor more accurately. Compensated current amplitudes corresponding to the torques, speeds and rotational positions in the electric motor are stored in a memory 61. Address setting unit 91 prepares a read address AD.sub.1 in the memory 61 from the torque command T, speed information VL and rotational motor position P. The prepared read address AD.sub.1 is then used to read a torque error compensation data MD.sub.1 from the memory 61. An adder 12 adds the torque error compensation data MD.sub.1 thus prepared to the torque command T to determine current amplitudes AM in the electric motor. Three-phase current setting unit 10 sets three-phase AC current commands CU, CV and CW based on the current amplitudes AM and rotational motor position P. Thus, the rotation of the electric motor can be accurately controlled.

REFERENCES:
patent: 3919609 (1975-11-01), Klautschek et al.
patent: 4415844 (1983-11-01), Mendenhall et al.
patent: 4959797 (1990-08-01), McIntosh
patent: 5122719 (1992-06-01), Bessenyei et al.
patent: 5223775 (1993-06-01), Mongeau
patent: 5229677 (1993-07-01), Dade et al.

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