MTPA control method of permanent magnet synchronous motor based on Newton iteration method

Abstract

The invention discloses an MTPA control method of a permanent magnet synchronous motor based on a Newton iteration method. The MTPA control method comprises the following steps: acquiring a target torque instruction output by a speed regulator and real-time parameters of the permanent magnet synchronous motor; newton iteration operation is carried out according to the target torque instruction output by the speed regulator and the real-time parameters of the permanent magnet synchronous motor, an optimal current instruction is obtained through solving, the optimal current instruction is input into the current regulator, and MTPA control over the permanent magnet synchronous motor is achieved. The method solves the problems that in an existing MTPA control method of the permanent magnet synchronous motor, off-line experiments are mostly adopted or optimal currents corresponding to different torques are pre-calculated and stored as a look-up table, a current instruction is obtained through look-up in the running process, the look-up table needs to be measured and established in advance in the method, the control strategy deployment process is tedious, the preparation period is long, and the cost is high. And measurement is easily interfered by equipment precision and environment, and measurement errors are introduced.

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