This motor control method includes: a step in which the stator current and the stator voltage are acquired from a phasor representation using an alphabeta fixed coordinate system or a dq rotary coordinate system as a reference; a step in which the angle phi between the stator current and the stator voltage is calculated; a step in which the torque angle delta is calculated on the basis of the formula delta=sin-1[L*Iscos(phi)/psim], wherein L represents armature inductance, psim represents the magnetic flux of a rotor magnet, and IS represents the size of the stator current; and a step in whicha motor is controlled on the basis of the torque angle delta.
MOTOR CONTROL METHOD, MOTOR CONTROL SYSTEM, AND ELECTRIC POWER STEERING SYSTEM