Abstract: Maximum torque per ampere（MTPA）control is one of the important methods to improve the

efficiency of sensorless drive system of permanent magnet synchronous motor（PMSM）. In the sensorless drive

system，the traditional calculation method deduces the analytical solution of the optimal current vector angle

according to the formula，which ignores the characteristics of the position error changes，and the accuracy of the

injection virtual signal optimization method is also reduced by the position error. In order to solve this problem，an

MTPA control method considering position estimation error was proposed. By comparing the optimal current vector

angle tracking result of the above two methods in the sensorless drive system，the position error was estimated.

Then the estimated position error was applied to correct the motor mathematical model for the high-accuracy

tracking of the optimal current vector angle. Finally，the effectiveness of the proposed method was verified on the

2.2 kW interior PMSM（IPMSM）experimental platform.

      Key words: interior permanent magnet synchronous motor（IPMSM）；maximum torque per ampere（MTPA ）

control；sensorless control；virtual signal injection