Abstract
This paper proposed an improved sensorless control strategy for ship electric propulsion which bases on I/f control and back electromotive force integral (EMF), suppressing the speed fluctuation during algorithm switching, improving the flux estimation accuracy of internal permanent magnet synchronous motors (IPMSMs) and achieving the stable operation of the motor. Firstly, this strategy was adopted for controlling the stator current during the switching process to improve speed fluctuation. Then, a simple flux estimation method is presented by rewriting the mathematical model of IPMSM. To achieve the result which overcomes the problem of flux estimation and current measurement errors and improved LPF was developed which solved the phase delay and DC-offset problem of flux estimation. Finally, the propeller load platform is under construction to verify the effectiveness of the control strategy. Experimental results show that the system based on this method works smoothly and it has better speed tracking performance.
Highlights
In past few years, due to reduction of the cost of permanent magnetic materials and the development of high performance processors, PMSMs are widely applied in the industry because of the many advantages such as high efficiency, high power density, and fast dynamic response. [1]–[3]
Based on this paper, [31] derived a new method to estimate the rotor position using only the q-axis inductance, which is helpful to reduce the complexity of the algorithm for estimating the flux of internal permanent magnet synchronous motors (IPMSMs), but this scheme is not useful to solve the integral initial value and zero drift problem introduced by the back electromotive force integral (EMF) algorithm
This paper presented the switching problem of IPMSM motor from I/f control to double closed-loop control and the defects of the back EMF integration algorithm
Summary
Due to reduction of the cost of permanent magnetic materials and the development of high performance processors, PMSMs are widely applied in the industry because of the many advantages such as high efficiency, high power density, and fast dynamic response. [1]–[3]. Based on this paper, [31] derived a new method to estimate the rotor position using only the q-axis inductance, which is helpful to reduce the complexity of the algorithm for estimating the flux of IPMSM, but this scheme is not useful to solve the integral initial value and zero drift problem introduced by the back EMF algorithm. The stator current control strategy is explained in this article which improves the system stability of the switching process This strategy proposed an improved back EMF algorithm to analyze the mathematical model of the motor. Where TL,max is the maximum load torque during startup It can be seen from equation (3) that in the motor starting process, i∗q cannot exceed the rated current of the motor, if J or TL is large, the acceleration should be designed to be smaller.
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