초록 ▼

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

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.

대표청구항 ▼

What is claimed is: 1. A PWM control unit for producing PWM signals in a multi-axis servo motor drive control, comprising: a time slice selection unit for generating a plurality of axis selection signals to select components related to a particular axis in the multi-axis control based on a timing o

What is claimed is: 1. A PWM control unit for producing PWM signals in a multi-axis servo motor drive control, comprising: a time slice selection unit for generating a plurality of axis selection signals to select components related to a particular axis in the multi-axis control based on a timing oscillation signal; a plurality of storage elements coupled to the time slice selection unit and associated with a phase signal for a motor phase, each of the storage elements being selectably coupled to the associated phase signal based on the axis selection signals generated by the time slice selection unit; the storage elements being operable to output a value upon being selected to contribute to generating a PWM control output for the selected axis. 2. The PWM control unit according to claim 1, further comprising a plurality of carrier storage elements associated with a carrier frequency command, the carrier storage elements being selectable to be coupled to the carrier frequency command based on the axis selection signal. 3. The PWM control unit according to claim 1 further comprising a counter device for influencing the PWM control output, the counter device being selectively loaded with a counter state associated with the selected axis in accordance with the axis selection signals. 4. The PWM control unit according to claim 1, further comprising a plurality of gate signal storage elements associated with the motor phase, the gate signal storage elements being selectable to be coupled to the PWM control output for the motor phase based on the axis selection signals. 5. The PWM control unit according to claim 1, further comprising: a digital filter coupled to the PWM control output for influencing the PWM control output in accordance with a state of the digital filter; and a plurality of filter state elements being selectable to be loaded into the digital filter based on the axis selection signals to influence the related PWM control output for the selected axis. 6. The PWM control unit according to claim 1, further comprising a plurality of PWM enable storage elements associated with a PWM enable signal, the PWM enable storage elements being selectable to be coupled to the PWM enable signal based on the axis selection signals. 7. The PWM control unit according to claim 1, further comprising a plurality of deadtime storage elements associated with a deadtime command, the deadtime storage elements being selectable to be coupled to the deadtime command based on the axis selection signals. 8. A servo motor control processor for controlling multiple servo motor axes, wherein the processor incorporates the PWM unit of claim 1. 9. A method for producing PWM signals in a multi-axis servo motor drive control, comprising: generating a plurality of axis selection signals for selecting components related to a particular axis in the multi-axis control based on a timing oscillation signal; selectably coupling storage elements associated with a motor phase to a motor phase command signal based on the axis selection signals; outputting from the storage elements a PWM control output for driving the motor phase for the selected axis. 10. The method according to claim 9, further comprising selectively coupling a plurality of carrier storage elements to a carrier frequency command based on the axis selection signals. 11. The method according to claim 9, further comprising loading a counter device with a counter state on the basis of the axis selection signals; and combining an output of the counter with the PWM control output to produce a motor phase control signal on the basis of the axis selection signals. 12. The method according to claim 9, further comprising selectively coupling a plurality of motor phase drive command storage elements to the PWM control output for the motor phase based on the axis selection signals. 13. The method according to claim 9, further comprising selectively loading a digital filter with a filter state based on the axis selection signals. 14. The method according to claim 9, further comprising selectively coupling a plurality of PWM enable storage elements to a PWM enable signal based on the axis selection signals. 15. The method according to claim 9, further comprising selectively coupling a plurality of deadtime storage elements to a deadtime command signal based on the axis selection signals. 16. A multiple axis servo motor drive control system for providing three-dimensional position control of a moving object, comprising: a host system for supplying multi-axis servo control commands; 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; the PWM control unit being operable to provide multiple sets of PWM signals to supply a respective set of PWM signals to a motor drive for a selected axis among a plurality of axes; the respective set of PWM signals produced by the PWM control unit for said selective axis being selected on the basis of a time slice signal generated in conjunction with a timing oscillation signal; and wherein: the PWM control unit further comprises a plurality of storage elements for storing motor drive command signals for said plurality of motor phases of said plurality of axes, a respective set of storage elements for said plurality of axes being associated with each motor phase; and said set of storage elements being selectively coupled to the motor drive command signals on the basis of the time slice control signals.