초록 ▼

An all digital control method for motor drivers eliminates physical motor current sensing. The motor and the driver are modeled to estimate the actual current and the estimated current is used to perform motor control. This provides simplified driver circuitry. Driver non-linearity due to driver dea

An all digital control method for motor drivers eliminates physical motor current sensing. The motor and the driver are modeled to estimate the actual current and the estimated current is used to perform motor control. This provides simplified driver circuitry. Driver non-linearity due to driver dead time may be compensated and minimum driver on times are accommodated while providing good waveform fidelity, minimized motor heating and increased motor system damping.

대표청구항 ▼

[ I claim:] [1.] A servo motor system, comprising:output driver circuitry for driving coils of a motor, the driver circuitry responsive to control signals;pulse width modulation (PWM) logic circuitry coupled to the driver circuitry and producing the control signals, the PWM logic circuitry responsiv

[ I claim:] [1.] A servo motor system, comprising:output driver circuitry for driving coils of a motor, the driver circuitry responsive to control signals;pulse width modulation (PWM) logic circuitry coupled to the driver circuitry and producing the control signals, the PWM logic circuitry responsive to command codes;motor position feedback circuitry that produces a signal indicative of motor position information; anda digital processor coupled to the PWM logic circuitry and to the motor position feedback circuitry, the digital processor generating the command codes,wherein the digital processor estimates a motor current through modeling based on characteristics of the motor and of the output driver circuitry, and based on motor position information so that the digital processor can predict the motor current without sensing the motor current and whereinthe digital processor generates the command codes in response to the estimated motor current.