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Abstract
By analyzing the relationship between the electromagnetic parameters and the secondary position during the primary and secondary coupling transition of the segment winding permanent magnet linear synchronous motor (SW-PMLSM), the variable parameter mathematical model of the rotor side of the SW-PMLSM is established. Taking the three-stage primary lifting system as an example, the dynamic process of the whole system is simulated and analyzed. According to the characteristics of its parameters, the segmentation vector control is obtained as the best stability control method. However, in practical applications, in order to save costs, the segmented linear motor often adopts the effective section parallel power supply mode, and the SW-PMLSM parallel power supply model is obtained by approximate simplification. This paper proposes a SW-PMLSM high-efficiency V/f control method, which combines the advantages of traditional V/f control and field-oriented control. It does not need to install position sensor, and can realize simple and high-performance motor drive. Finally, simulation and experimental results are provided to validate the effectiveness of the fidelity of the proposed strategy.
Highlights
As a new type of linear motor, the primary segment winding permanent magnet linear synchronous motor has the advantages of high thrust density, low power loss and fast dynamic response [1]–[4]
The research object of this paper is SW-PMLSM with winding segmentation, no gap structure between segments, and the length of the mover is a multiple of the single-segment stator (The thrust of each section of the SW-PMLSM with this structure is uniformly changed during the winding switching process)
For SW-PMLSM, when the coupling area between the primary and secondary remains unchanged, the amplitude of the coupled magnetic flux of the permanent magnet is constant, and the size of the permanent magnet coupled flux changes with the coupling area between the primary and secondary When the mover gradually withdraws from a certain stator section, the permanent magnet coupled flux linkage is gradually reduced to zero, and its variation can be regarded as a linear change in the approximate analysis
Summary
As a new type of linear motor, the primary segment winding permanent magnet linear synchronous motor has the advantages of high thrust density, low power loss and fast dynamic response [1]–[4]. The active reactive power of the motor is calculated by the current detected on the stator side, and the proportional gain is introduced into the closed loop to compensate the input voltage amplitude and phase angle (electromagnetic field rotational speed) of the stator in the V/f control This closed-loop V/f control avoids the introduction of complex operations brought by vector control and achieves efficiency control. MODEL OF SW-PMLSM Different from the traditional PMLSM, the magnetic circuit structure between the primary and secondary of the SW-PMLSM changes with the relative position, so the electromagnetic parameters of the motor are a function of the secondary position. Variable parametric magnetic circuit relationship of SWPMLSM is a key issue in overall modeling
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