Method for calculating peak value and valley value of three-phase current of permanent magnet synchronous motor

According to the method for calculating the peak value and the valley value of the three-phase current of the permanent magnet synchronous motor provided by the invention, different rotating speeds of the motor are indirectly reflected by judging the size of the sampling period and the size of the electrical angle accumulated value, so that the calculation frequencies for calculating the peak value and the valley value of the three-phase current are different; according to the method, calculation errors of three-phase current peak values and valley values caused by the rotating speed of the motor due to fixed-frequency calculation in a traditional calculation method can be avoided, the calculation precision is improved, the stability and safety of motor control are guaranteed, and therefore the performance of the whole vehicle is improved; and the operation memory of the motor controller can be saved, and the unnecessary calculation amount is reduced, so that the operation load rate of the motor controller is