Qiang Tan

Optimization for the Pole Structure of Slot-Less Tubular Permanent Magnet Synchronous Linear Motor and Segmented Detent Force Compensation

Slot-less tubular permanent magnet synchronous linear motor, usually adopts a cylindrical pole structure. It results in big leakage flux on the axis and serious uneven flux distribution in the secondary iron. The improved convex pole was used and researched in this paper, and a layered orthogonal optimization method was applied to reach the goal of the higher thrust and less permanent magnet dosage combing with the finite-element method. Therefore, the best values of the pole parameters were obtained. Because the detent force resulting from the end effect is hard to suppress under the strict volume constrains, the segmented detent force compensation control was further studied. A prototype was machined and tested, and the results indicated that the combination of the improved convex pole and detent force compensation is a very effective method to improve the thrust performance.

Calculation and analysis of the loss for tubular flux-switching permanent magnet linear motor (TFSPMLM)

This research focused on the calculation and analysis of the loss for the tubular flux-switching permanent magnet linear motor (TFSPMLM). The magnetic filed of the primary and secondary irons were calculated, and the flux density components in the radial and axis direction were analyzed. On the basis, the iron loss models including the eddy current loss and hysteresis loss were established. The iron loss model for the primary took the magnetic field features into account, including the non-sinusoidal magnetic field, existing D. C. magnetic bias. And the iron loss model for the secondary had considered the influence of the small hysteresis loops (B-H loops). The distribution and variation of iron loss densities on the primary and secondary had been obtained. Moreover, the whole iron loss on the primary and secondary were also calculated and compared. Finally, the proportions of the iron loss, winding loss and eddy current loss in the permanent magnets (PMs) were analyzed and compared in brief.

Analysis and optimization of the inner armature tubular flux-switching permanent magnet linear motor

Inner armature tubular flux-switching permanent magnet linear motor (IA-TFSPMLM) has a large thrust, simple structure, and easy to magnetic separation, etc. This paper carries out the research on a 12-slot/14-pole inner armature motor, including analyzing the electromagnetic performance of the permanent magnet and wingding, studying the law of the magnetic flux leakage and its thrust characteristics, which is also compared with the outer armature motor. Then the key design parameters are optimized. Finally, the convex permanent magnetic is proposed to reduce the flux leakage and improve thrust index effectively. The conclusion can provide reference for the design and application of the IA-TFSPMLM.

Analysis of the eddy current loss in the secondary of tubular flux-switching permanent magnet linear motor (TFSPMLM)

This research focused on the eddy current loss in the secondary of a tubular flux-switching permanent magnet linear motor (TFSPMLM). The secondary of the TFSPMLM is one whole tubby iron with slot structure, which is different with the silicon-steel sheet laminated. Hence, this paper deduced eddy current loss model of the tubular iron, and then established the calculation model of the secondary loss. According to the field component obtained by finite element analysis, the secondary eddy current loss was calculated by using the proposed model. On this basis, the distribution and variation of different losses were analyzed and compared. Finally, the loss of a prototype was tested, and results show that the measurement values are basic equal to the calculated values.

The analysis and compensation control of the detent force for slot-less Tubular Permanent Magnet Linear Synchronous Motor

This paper focused on the analysis and compensation control of the detent force for slot-less Tubular Permanent Magnet Linear Synchronous Motor (TPMLSM). Based on the emulation analysis and the measurement for the detent force, the piecewise fitting compensation control was put forward to reduce the influence on the linear servo system which caused by the fluctuation of the detent force. The experimental result demonstrates that the method is effective and can significantly improve the control performance.

Suppression of leakage flux and thrust ripple for slot-less tubular permanent magnet linear synchronous motor

This paper focuses on the suppression of the leakage flux and thrust ripple for slot-less tubular permanent magnet linear synchronous motor (TPMLSM). The winding factors of the unipolar and bipolar winding structures were analyzed firstly. And then the convex pole was used to reduce the leakage flux and improve the average thrust mainly for the bipolar winding structure. On this basis, the primary core compensation was adopted to reduce the thrust ripple, which is carried out based on the analysis of the asymmetry inductances.

Optimization of the Thrust Ripple of a Tubular Flux-Switching Permanent Magnet Linear Motor

The effective optimization methods are needed to reduce the thrust ripple for the tubular flux-switching permanent magnet linear motor (TFSPMLM), which is significant for reducing the vibration, and improving the reliability. The auxiliary teeth and core bridge are set and analyzed for the bipolar and single-polar winding structures. On this basis, this paper focused on a new method of the secondary pole pitch fine-tuning which can overcomes the disadvantages of increasing the volume, decreasing the average thrust, adding the cost, and so on. The influences of tuning the secondary pole pitch on the average thrust and the thrust ripple for the different winding structure motors are calculated and analyzed. The conclusion can provide reference for the application of the method of tuning secondary pole pitch to the TFSPMLM for different background demands.