Apparatus and method of compensating for steering torque of driving motor

1. An apparatus for compensating for a torque of a motor, the apparatus comprising:

a torque information collector configured to collect steering information, motor position information, and predetermined motor information;

a torque ripple calculator configured to determine a target torque based on the steering information and to determine a compensation torque for torque ripple based on the target torque and the motor information;

a compensation current calculator configured to determine a compensation current value based on the motor information and the compensation torque;

a current value generator configured to convert the target torque into a target current value and to generate an output current value based on the target current value and the compensation current value; and

a current signal output configured to output a current control signal corresponding to the output current value,

wherein the motor position information is a motor position signal output from a motor position sensor, and the motor information comprises at least one of a torque constant, a torque ripple harmonic order, a phase of the torque ripple, and a torque ripple ratio (TRR) of the torque ripple, and

wherein the torque ripple calculator determines the compensation torque using the target torque and the TRR as factors.

2. The apparatus of claim 1 , wherein the steering information is at least one of a torque signal output from a torque sensor for sensing a steering operation and a steering angle signal output from a steering angle sensor for sensing the steering operation.

3. The apparatus of claim 1 , wherein the phase of the torque ripple or the TRR thereof is determined based on a pre-stored map or lookup table.

4. The apparatus of claim 1 , wherein the phase of the torque ripple or the TRR thereof is determined as a value obtained by correcting a phase of a past torque ripple or a TRR based on the result of a compensation current value according to the phase of the past torque ripple or the TRR.

5. The apparatus of claim 1 , wherein the compensation current calculator determines an amplitude of a compensation current for the torque ripple using the torque constant and the compensation torque as factors.

6. The apparatus of claim 5 , wherein the compensation current calculator determines the compensation current value based on the amplitude, the motor position information, the harmonic order, and the phase.

7. The apparatus of claim 6 , wherein the current value generator generates the output current value by adding the compensation current value to the target current value.

8. A method of compensating for a torque of a motor, the method comprising:

collecting steering information, motor position information, and predetermined motor information;

calculating a target torque based on the steering information and calculating a compensation torque for torque ripple based on the target torque and the motor information;

calculating a compensation current value based on the motor information and the compensation torque;

converting the target torque into a target current value and generating an output current value based on the target current value and the compensation current value; and

outputting a current control signal corresponding to the output current value,

wherein the motor position information is a motor position signal output from a motor position sensor, and the motor information comprises at least one of a torque constant, a torque ripple harmonic order, a phase of the torque ripple, and a torque ripple ratio (TRR) of the torque ripple, and

wherein the calculating the target torque comprises calculating the compensation torque using the target torque and the TRR as factors.

9. The method of claim 8 , wherein the calculating the compensation current value comprises calculating an amplitude of a compensation current for the torque ripple using the torque constant and the compensation torque as factors.

10. The method of claim 9 , wherein the calculating the compensation current value comprises calculating the compensation current value based on the determined amplitude, the motor position information, the harmonic order, and the phase.

11. The method of claim 10 , wherein the converting the target torque into the target current value and the generating the output current value comprises generating the output current value by adding the compensation current value to the target current value.