Sliding mode control of a permanent magnet direct drive under non‐linear friction

2011 ◽  
Vol 30 (3) ◽  
pp. 853-863 ◽  
Author(s):  
Stefan Brock
Keyword(s):  
Sliding Mode Control ◽  
Permanent Magnet ◽  
Sliding Mode ◽  
Direct Drive ◽  
Mode Control ◽  
Non Linear ◽  
Linear Friction

Second Order Sliding Mode Control of Direct-Drive Ring Permanent Magnet Torque Motor

2011 ◽  
Vol 383-390 ◽  
pp. 5964-5971 ◽  
Author(s):  
Yi Biao Sun ◽  
Ya Nan Jing ◽  
Jia Kuan Xia
Keyword(s):  
Sliding Mode Control ◽  
Permanent Magnet ◽  
Sliding Mode ◽  
Servo System ◽  
Second Order ◽  
Continuous Control ◽  
Direct Drive ◽  
Mode Control ◽  
Twisting Algorithm ◽  
Second Order Sliding Mode

The direct-drive ring permanent magnet torque motor is easily affected by parameters changes and the load torque disturbances, which reduces the servo performance of the system. In order to enhance the robustness of the servo system, the super twisting algorithm based on the second order sliding mode control (SMC) is proposed as the speed controller of the direct-drive servo system. The super twisting algorithm need not know the information of the sliding mode time derivative, which through the continuous control measure the sliding mode and its derivative approach zero in finite time. This method not only guarantees the robustness of the servo system and eliminates chatting, but also enhances the static precision of the servo system. The simulation results show that the servo system of the direct-drive NC rotary table has a very strong robustness by adopting the control method against parameters changes and the external disturbances.

Application of Robust Chattering-Reduction Sliding Mode Control Techniques for Position Control of a Vector-Controlled Induction Machine with Non-Linear Friction Dynamics

2005 ◽  
Vol 219 (8) ◽  
pp. 577-590
Author(s):  
K B Goh ◽  
M W Dunnigan ◽  
B W Williams
Keyword(s):  
Sliding Mode Control ◽  
Position Control ◽  
Sliding Mode ◽  
Induction Machine ◽  
Control Algorithms ◽  
Mode Control ◽  
Non Linear ◽  
Linear Friction ◽  
Linear Induction Machine ◽  
Friction Dynamics

Sliding mode control (SMC) methods possess several advantageous properties such as robustness against parameter variation, disturbance rejection, straightforward design, and are simple to implement. In this paper, a sliding mode control algorithm (which considers the non-linear friction dynamics) based on an equivalent control technique is designed and implemented on a non-linear induction machine system with non-linear friction dynamics such as Coulomb, windage, Stribeck, and static friction. The chattering phenomenon, which is inherent in the standard sliding mode algorithm, is discussed, as well as the techniques to reduce the chattering effect. A sixth-order non-linear induction machine model is employed for simulation analysis. The developed control algorithms are then tested for position control of a practical vector-controlled induction machine, in three different operating conditions (nominal load, high inertial load, and rotor resistance mismatch). The controller performance results are compared practically with several different sliding mode control algorithms as well as with a fixed-gain controller test.

Control of Direct-Drive Compressor Based on Variable Structure Sliding Mode

2011 ◽  
Vol 88-89 ◽  
pp. 122-127
Author(s):  
Mei Peng Zhong ◽  
Feng Li Huang
Keyword(s):  
Sliding Mode Control ◽  
Permanent Magnet ◽  
Control Strategy ◽  
Sliding Mode ◽  
Permanent Magnet Synchronous Motor ◽  
Variable Structure ◽  
Mathematics Model ◽  
Direct Drive ◽  
Air Compressor ◽  
Mode Control

In order to reduce vibration a new variable structure sliding mode control strategy was proposed in direct-drive air compressor,because torque fluctuate of direct-drive air compressor is large. In order to reduce volume and economize energy, direct-drive air compressor dived by permanent magnet synchronous motor(PMSM). Mathematics model of air compressor torque was built up, and load of air compressor was analyzed. Mathematics model and torque equation of PMSM were built up. Variable structure sliding mode to PMSM was built up. Basing on characteristic to control of PMSM and load of air compressor, the system was simulated in simulink. The result shows that rotate speed fluctuate of direct-drive air compressor controlled by variable structure sliding mode is less than that of direct-drive air compressor controlled by PI. The test of direct-drive air compressor dived by PSMS was done. Experimental results verified that variable structure sliding mode control strategy improve dynamic quality of system and has good robustness. Volume a of Direct-drive air compressor dived by permanent magnet PMSM are little, and its efficiency is high.

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