Pulse torque method of permanent-magnet synchronous motor for lowering electric power steering

The invention discloses a pulse torque method of a permanent-magnet synchronous motor for lowering electric power steering. The method comprises the following steps of a, obtaining a tooth groove rotary angle according to an electric rotor angle, and estimating tooth groove torque of the permanent-magnet synchronous motor; b, obtaining a flux harmonic rotary angle according to the electric rotor angle, and estimating flux harmonic torque of the permanent-magnet synchronous motor; c, weakening periodic pulse torque caused by a tooth groove and flux harmonic waves through an iterative control algorithm. Through the iterative learning control algorithm, the periodic pulse torque caused by the tooth groove and the flux harmonic waves is weakened, and the precision of motor controlling is improved, so that an EPS system obtains a better steering hand feeling. 本发明公开了种降低电动助力转向用永磁同步电动机的脉动转矩方法，包括如下步骤：a)根据转子电角度获取齿槽转角，并估算永磁同步电动机的齿槽转矩；b)根据转子电角度获取磁通谐波转角，并估算永磁同步电动机的磁通谐波转矩；c)通过迭代控制算法削弱由齿槽以及磁通谐波引起的周期性脉动转矩。本发明提供的降低电动助力转向用永磁同步