Abstract
For the problem of low control performance of Bearingless Induction Motor (BIM) control system in the presence of large load disturbance, a novel load torque sliding mode observer is proposed on the basis of establishing sliding mode speed control system. The load observer chooses the speed and load torque of the BIM control system as the observed objects, uses the speed error to design the integral sliding mode surface, and adds the low-pass filter to reduce the torque observation error. Meanwhile, the output of the load torque is used as the feedforward compensation for the control system, which can provide the required current for load changes and reduce the adverse influence of disturbance on system performance. Besides, considering that the load changes lead to the varying rotational inertia, the integral identification method is adopted to identify the rotational inertia of BIM, and the rotational inertia can be updated to the load observer in real time. The simulation and experiment results all show that the proposed method can track load torque accurately, improve the ability to resist disturbances, and ameliorate the operation quality of BIM control system. The chattering of sliding mode also is suppressed effectively.
Highlights
Based on the similarity principles of magnetic bearing and alternating current (AC) motor stator structure, Bearingless Induction Motor (BIM) is formed
BIM has many better advantages than the traditional asynchronous motor, such as simple structure, uniform air gap, high mechanical strength, high speed, and ultrahigh speed running in the corrosion or other special environments
The traditional PI controller cannot acquire high-performance control for BIM when the control system is disturbed by load torque [10]
Summary
Based on the similarity principles of magnetic bearing and alternating current (AC) motor stator structure, BIM is formed. BIM achieves the integration of rapid rotation and stable suspension of rotor by changing the currents in the windings and avoids the mechanical bearing friction, wear and tear, and lubrication It breaks the bottleneck of traditional asynchronous motor developing towards the higher precision and higher speed direction [1,2,3,4,5]. In [23], the adaptive sliding mode control for uncertain singularly perturbed nonlinear system was designed It reduced the effects of uncertainty, and guaranteed the control performance. In [24, 25], the load sliding mode observers were proposed They diminished the adverse effects of load changes on PMSM and improved the antidisturbance ability of controlled system at some level. The simulation and experimental results show that the proposed method overcomes the disadvantageous effects on the speed regulation system generated by load disturbances and strengthens the antidisturbance ability of the system
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