Motor control apparatus and electric power steering apparatus using the same

A motor control apparatus that calculates duty command values of respective phases for controlling currents of a motor forms PWM-signals in correspondence to said duty command values of said respective phase, drives said motor by means of an inverter based on said PWM-signals, and inputs a motor angle from a rotation sensor to detect said motor angle of said motor:

• wherein a 1-shunt type current detecting circuit is connected to a power source side or a ground side of said inverter;
• and comprising;
• a comparing section to compare said duty command values and determine a size relation of said duty command values;
• a timing control section to sequentially enable timings of rising or falling with respect to said PWM-signals with a predetermined order based on said size relation;
• and
• a motor angle output section to detect a change of an order of said rising in correspondence to a predetermined algorithm, to output said motor angle from said rotation sensor when said predetermined order of said rising is not changed, and to estimate a motor angle estimation value based on past motor angles of said rotation sensor and output said motor angle estimation value as said motor angle when said predetermined order of said rising is changed,
• wherein said motor is drive-controlled by means of an output signal from said motor angle output section.