Novel sliding mode control method for cylindrical fault tolerant permanent magnet linear motor system with mismatched interference

Abstract

The invention discloses a novel sliding mode control method for a cylindrical fault tolerant permanent magnet linear motor system with mismatched interference. The method comprises the steps of analyzing the characteristics of the structure of a five-phase cylindrical fault tolerant permanent magnet linear motor; establishing a two-order mathematical model of the five-phase cylindrical fault tolerant permanent magnet linear motor based on the mismatched interference d1 (t) and matched interference d2 (t); designing a new sliding surface sigma to solve the derivative of the sliding surface sigma, solving a new sliding mode control law based on a mismatched disturbance observer, processing the obtained sliding mode control law, a d axis voltage setpoint, an x axis voltage setpoint and a y axis voltage setpoint outputted by a PI current regulator by a voltage source inverter, and using the CPWM modulation method to achieve the high control performance and operation of the cylindrical fault tolerant permanent magnet linear motor system with mismatched interference. The new SMC strategy of the novel sliding mode control method can make a motor speed follow quickly without overshoot and steady-state errors, at the same time the strategy effectively inhibits the sliding mode buffeting, and is highly robust to the system mismatch interference.

Description

technical field [0001] The invention relates to a sliding mode control method of a permanent magnet synchronous motor, in particular to a sliding mode control method of a fault-tolerant permanent magnet linear motor system that does not match a disturbed cylinder. It is suitable for occasions that have high requirements on the reliability and dynamic performance of the motor, such as aerospace, ship propulsion, and electric vehicles. Background technique [0002] With the development of society and the improvement of people's living standards, the requirements for the comfort, safety and stability of car driving are getting higher and higher. As an important part of modern automobiles, the performance of the suspension system has an extremely important impact on the ride comfort and operational stability of the vehicle. Therefore, the research on active suspension systems has been highly valued by the industry. As the core component of the active electromagnetic suspension ...

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Problems solved by technology

[0004] In view of the deficiencies of the existing motor sliding mode control technology, according to the characteristics of the cylindrical fault-tolerant permanent magnet linear motor and the problems in the prior art, the purpose of the present invention is to overcome the existence of the five-phase cylindrical fault-tolerant permanent magnet linear motor system for electromagnetic suspension. Unmatched interference seriously reduces the performance of the motor. A new SMC method for the mismatched and disturbed cylindrical fault-tolerant permanent magnet linear motor system of the present invention is proposed, which realizes fast motor speed tracking without overshoot and no steady state Error, realizes the effective suppression of sliding mode chattering, and has strong robustness to system mismatch interference. The new sliding mode controller has only one regulator, which avoids the coupling between the speed loop and the current loop, and has fewer parameters. , the parameter setting is simple and easy, thereby improving the dynamic performance and reliability of the mismatched and disturbed cylinder fault-tolerant permanent magnet linear motor system of the present invention

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