Efficient control method of multiphase permanent magnet synchronous motor

The invention discloses an efficient control method of a multiphase permanent magnet synchronous motor, which comprises the following steps of: establishing a model of electromagnetic torque and current vector angle of the multiphase permanent magnet synchronous motor based on an extreme value search principle, superposing a virtual high-frequency signal into the current vector angle, designing an extreme value search link, and calculating the extreme value of the multiphase permanent magnet synchronous motor. The optimal current vector angle is searched by detecting whether the partial differential of the electromagnetic torque item to the current vector angle item is zero or not, so that the multiphase permanent magnet synchronous motor generates the maximum electromagnetic torque under a certain current amplitude, and the copper consumption of the motor is reduced. The efficient control method for the multiphase permanent magnet synchronous motor has the advantages of being simple in control structure, con