A.C. motor drive method and apparatus for precision positional c

Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Running-speed control

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Details

318739, 318803, 318801, H02P 528

Patent

active

049629760

ABSTRACT:
A polyphase induction motor is driven from an inverter having a set of switches activated in prescribed on-off patterns to provide forward and reverse voltage vectors and a zero vector for controllably energizing the motor. Memories are provided on which there are written forward voltage vector data for forwardly energizing the motor, reverse voltage vector data for reversely energizing the motor, and zero vector data for de-energizing the motor. The voltage vector data and zero vector data are selectively read out from the memories in order to cause the inverter to generate in real time the corresponding voltage vectors and zero vectors needed for the motor to be quickly revolved to, and set out of rotation exactly in, a desired angular position. For such optimum motor speed control an ideal control curve is predefined which represents the ideal relationship between the motor speed and the difference between the actual and the desired angular position of the motor. The voltage vector data and zero vector data are read out from the memories so that an actual control curve representative of the actual relationship between the motor speed and the difference between the actual and the desired angular position may approximate the ideal control curve as closely as possible.

REFERENCES:
patent: 4366427 (1982-12-01), Walker et al.
patent: 4640389 (1987-02-01), Kamaike
patent: 4722042 (1988-01-01), Asano et al.
patent: 4763060 (1988-08-01), Takahashi
patent: 4843297 (1989-06-01), Landino et al.
patent: 4885518 (1989-12-01), Schauder
Paper entitled "High Resolution Servo System of an Induction Motor Using Linear Mode Sliding Control", 1988 Nat'l Convention of the Japanese Institute of Electrical Engineers (no translation provided).

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