Patent ID: 7839110

Claim:
A motor control system, comprising: at least one first-type amplifier for driving a first motor; at least one second-type amplifier for driving a second motor; a numerical control device for controlling the at least one first-type amplifier and the at least one second-type amplifier; and a serial bus that sequentially connects the numerical control device, the at least one first-type amplifier, and the at least one second-type amplifier, wherein the numerical control device comprises: a first processor for calculating a positional instruction or a velocity instruction of all the motors to be controlled; a second processor for calculating a PWM instruction from the positional instruction or the velocity instruction calculated by the first processor for the first motor to be driven by the at least one first-type amplifier; and a serial bus control circuit for outputting to the serial bus (i) the PWM instruction calculated by the second processor, and (ii) the positional instruction or the velocity instruction calculated by the first processor for the second motor to be driven by the at least one second-type amplifier; the first-type amplifier is configured to generate a drive current signal of the first motor directly from the PWM instruction received from the numerical control device via the serial bus; and the second-type amplifier comprises a Digital Signal Processor (DSP) for calculating a PWM instruction of the second motor from the positional instruction or the velocity instruction received from the numerical control device via the serial bus, and the second-type amplifier is configured to generate a drive current signal of the second motor from the PWM instruction calculated by the DSP; and the first-type amplifier is free of any DSP.