Method for controlling loss minimization of surface-mounted permanent magnet synchronous motor

The invention discloses a method for controlling loss minimization of a surface-mounted permanent magnet synchronous motor. The method comprises the following steps: 1, calculating specified exciting currents, leading to loss minimization, of d and q axes of the motor according to a Lagrange multiplier method according to a specified revolving speed and a specified electromagnetic torque; 2, calculating the exciting currents of the d and q axes according to the electric angle of a motor rotor, an A phase voltage, a B phase voltage and the current; 3, calculating specified voltages of the d and q axes according to the electric angular speed of the motor rotor, the exciting currents of the d and q axes, and the specified exciting currents of the d and q axes; 4, converting the specified voltages of the d and q axes into specified voltages in a three-phase static coordinate by using equipower two-phase rotating to three-phase static conversion; 5, producing 6 paths of SVPWM signals according to the specific volt