A novel sliding-mode control is designed with a load thrust observer for the Linear Permanent Magnetism Synchronous Motors(LPMSM),in order to compensate the disturbance and effectively minimize the system chattering;introducing an integral action in the sliding mode to eliminate the system error and chattering.

The chattering of the VSC system is effectively minimised by designing a load thrust observer and a disturbance feed forward compensation.

Sliding Mode Control of Permanent Magnet Synchronous Motor Based on Load Observer;

A load observer is designed to .

An adaptive speed control scheme for DC drive system, which combines an adaptive PID controller based on single neuron with a load observer, is presented.

To decrease computation of the adaptive backstepping method and simplify control system,on the one hand a load torque observer is applied to real-time estimate load torque,on the other hand a current hysteresis comparators regulation technique for voltage sourced PWM inverters(CR-PWM-VSI) is also applied to reduce order of control system.

Aiming at the permanent magnet linear synchronous motor servo system is vulnerable to load disturbance,parameters change and thrust fluctuations,the sliding mode control based on neural network thrust observer instead of the regular proportion integration(PI) was indicated to ensure that it achieves a more precise speed control with a wide range of speed.

On the basic of that,the strategy of double-loop multiple self-tuning control in the speed loop was brought forward,and then,the load disturbance observer and single neuron self-tuning PID controller were designed.