Multi-axis AC servo control system and method
AssigneeInternational Rectifier Corporation
InventorToshio Takahashi
Life of this patent
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Abstract
A multiple axis servo control implements a multi-tasking PWM control unit to provide PWM signals for multiple axes in a single unit. A time slice mechanism provides axis selection signals based on a system clock signal to permit control parameters of the selected axis to be processed to control the selected motor drive axis. The single unit PWM control mechanism eliminates complex and costly multiple axis networks typically associated with independent servo motor controls for each axis in a multi-axis system. A single PWM unit implementation also permits the reduction of components for closed loop current control and closed loop velocity control in the multi-axis servo control system.
Claims16
A multiple axis servo motor drive control system for providing coordinated three-dimensional position control of a moving object, comprising:
- a host system for supplying multi-axis servo control commands, wherein said PWM signals define said coordinated three-dimensional position control;
- a processor coupled to the host system for receiving the multi-axis servo control commands, the processor having a PWM control unit for producing PWM signals on the basis of the servo motor control commands, wherein said PWM signals define said coordinated three-dimensional position control;
- the PWM control unit comprising a time slice selection unit for generating a plurality of axis selection signals to select components related to a selected axis in the multi-axis control;
- said PWM control unit being operable to provide multiple sets of PWM signals to thereby supply a respective set of PWM signals to a motor drive for the selected axis;
- and
- the respective set of PWM signals produced by the PWM control unit for said selected axis being selected on the basis of said axis selection signals.
A method in a multi-axis servo motor drive control for producing PWM signals which define coordinated three-dimensional position control of a moving object, comprising the steps of:
- generating multi-axis servo control commands;
- receiving the multi-axis servo control commands and producing PXM signals which define said coordinated 3-D position control on the basis of the servo motor control commands;
- selecting a time slice for generating a plurality of axis selection signals for selecting components related to a particular axis in the multi-axis control;
- supplying a respective set of PWM signals to a motor drive for the particular axis;
- and
- selecting the respective set of PWM signals produced by the PWM control unit for said particular axis on the basis of said axis selection signals.
Dependencies are inferred from the claim text.