| 摘要 |
<P>PROBLEM TO BE SOLVED: To enhance motor efficiency by suppressing over control in the control for suppressing an uneven rotation of a motor. <P>SOLUTION: In the control method of motor where a PWM (pulse width modulation) voltage can be corrected depending on a load torque when PWM control of the motor is carried out, a position detection interval Tn is calculated by detecting a rotor position (ST1-ST2). The position detection interval is calculated for single revolution of the rotor and then the ratio (Tmax/Ttyp=α) between the maximum value Tmax of the position detection intervals T1-T12 and the average value Ttyp of the position detection intervals T1-T12 is calculated (ST5-ST7). Over control of uneven rotation is suppressed by increasing the value for correcting the PWM voltage as specified when the ratio α is higher than a specified value A (ST8, ST9) and decreasing the value for correcting the PWM voltage as specified when the ratio α is lower than a specified value B (ST10, ST11). <P>COPYRIGHT: (C)2005,JPO&NCIPI |
