Servomotor drive control system
AssigneeFanuc Corporation
InventorMitsuo Kurakake
Life of this patent
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Abstract
According to the servomotor drive control system of the invention, a processing section and a servomotor are arranged at physically separate locations. Data are exchanged via a data bus between a main CPU, which performs input data processing and sequence processing, and the processing section. As a result, servomotor drive commands and feedback data can be transferred at high speed without requiring a special interface device, and an arithmetic circuit section is separated from the environment in which the servomotor is installed.
Claims3
A servomotor drive control system in which a drive command signal and data fed back from a servomotor are processed to drive and control the servomotor, said servomotor drive control system comprising:
- a numerical control unit portion including:
- a main CPU for performing input data processing and sequence processing and supplying a drive command;
- a servo-control CPU, connected between said main CPU and the servomotor, for storing feedback data and pulse width modulated (PWM) command data in digital form for controlling current, velocity and position of the servomotor and for receiving the drive command from said main CPU;
- and
- a shared random access memory connected between said main CPU and said servo-control CPU;
- a servo-side portion including:
- data transfer means, connected to said numerical control unit portion, for receiving the PWM command data for controlling current, velocity and position of the servomotor from said servo-control CPU and feeding back the command data and detected data between said numerical control unit portion and the servo-side portion during a high speed operation;
- and
- drive means, connected to said data transfer means, including final stage drivel elements required to effect servo-control on the servomotor in accordance with the command data.
Dependencies are inferred from the claim text.