Motor control system, motor control device, brushless motor, and motor control method

摘要

A motor control system comprises a host controller for transmitting a command signal and receiving an information signal, a motor control device for receiving the command signal and transmitting the information signal, a signal transmission line for transmitting the command signal and the information signal, and a motor of which rotation is controlled by the motor control device. The host controller generates and transmits PWM command signal Si having a duty factor modulated by the command signal. The motor control device generates PWM information signal Fp having a duty factor modulated by the information signal, and transmits PWM information signal Fp in synchronization with PWM command signal Si. PWM command signal Si transmitted by the host controller includes a plurality of pulse periods having different pulse-period durations from one another.

主权项

1. A motor control system having a motor control device for controlling rotation of a motor according to a command of a host controller, the system comprising:
the host controller for generating a PWM command signal based on a command signal, transmitting the PWM command signal generated and receiving a PWM information signal generated based on an information signal; the motor control device for receiving the PWM command signal generated based on the command signal, generating the PWM information signal based on the information signal and transmitting the PWM information signal generated; two signal transmission lines in physical proximity to each other and connecting the host controller to the motor control device, the two signal transmission lines for transmitting the PWM command signal from the host controller to the motor control device, and transmitting the PWM information signal from the motor control device to the host controller individually as pulse signals; and the motor of which rotation is controlled by the motor control device, wherein the host controller generates the PWM command signal having a duty factor, that is a ratio of a pulse width to pulse-period duration, modulated by the command signal, and transmits the PWM command signal to the motor control device via a first transmission line of the two signal transmission lines, the motor control device generates the PWM information signal having a duty factor modulated by the information signal, and transmits the PWM information signal in synchronization with the PWM command signal to the host controller via a second transmission line of the two signal transmission lines, such that a first magnetic field radiated from the first transmission line and a second magnetic field radiated from the second transmission line cancel each other out, and the PWM command signal transmitted by the host controller includes a plurality of pulse periods having different pulse-period durations from one another.