A Slotted Double-Primaries Permanent Magnet Synchronous Linear Motor With a Low Thrust Ripple
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This article proposes a double-primaries tubular permanent magnet synchronous linear motor (DP-TPMSLM) with a low thrust ripple composed of two primaries, a secondary, and a flux barrier. For DP-TPMSLM, the odd harmonics in the detent force can be effectively eliminated by decoupling and modulating its cogging and end forces. The pole-slot combination and winding arrangement of the proposed motor are analyzed to realize the electromagnetic properties of the two primaries superimposed on each other. This article selects the 12-slot, 11-pole DP-TPMSLM as a sample, and a subdomain model considering the effects of cogging, ends, and magnetic barriers is developed through coordinate transformations. Subsequently, the structure of the motor end teeth is improved by combining the advantages of the proposed subdomain model and the finite-element method, which effectively suppresses the even harmonics present in the detent force, thus further reducing the thrust ripple of the motor. Finally, a prototype test and control platforms are built, and the experimental results show that the proposed DP-TPMSLM has a low thrust ripple and excellent working performance.Normal force
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Permanent magnet linear synchronous motor (PMLSM) drives suffer from serious thrust ripples caused by the end force, the cogging force, the friction force, etc. The thrust ripple seriously deteriorates the control performance, greatly limits the application, and has become the biggest disadvantage of PMLSM drives. In order to attenuate the complicated thrust ripples and improve the control performance, an auxiliary model compensated resonant extended state observer (AMC-RESO)-based proportional resonant (PR) thrust ripple suppression method is proposed in this article. The detent force, the dominant component of the thrust ripples, is preliminarily suppressed by a PR controller. On this basis, the residual thrust ripples are further estimated and compensated by incorporating the auxiliary model into a RESO. Therefore, the complicated thrust ripples including the dominant detent force and the residual disturbances are minimized to the greatest extent possible. The stability and parameter tuning of the proposed suppression method are also analyzed theoretically. Comparative experiments are carried out on a 750-W PMLSM drive to verify the effectiveness of the proposed AMC-RESO-based PR thrust ripple suppression method.
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A new linear motor based on the Sawyer principle is firstly introduced. Some important features of the linear actuator are discussed for better understanding of its performances and functions with absolute positioning. We investigated the static characteristics of the linear motor such as the relationship between the current and the maximum thrust force (I-F curve), the relationship between the displacement and the thrust force (D-F curve), and the positioning accuracy. The measuring methods for these characteristics are explained in detail. We analyzed the experimental data and evaluated the characteristics. We obtained that the suitable working current is 1A and the maximum thrust force is 15N for the linear motor. The positioning accuracy is ±12µm.
Linear actuator
Linear relationship
Linear motion
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The linear motor is available for linear transition motion, because of its advantages, the motor design and its application have gradually increased, but the quantitative measurement system of thrust force has not been generalized. Need analysis of correct thrust for control performance improvement of HB-LPM (HB-type linear pulse motor). It is difficult to analyze HB-LPMpsilas thrust. In this paper, HB-LPMpsilas thrust is expressed to mathematical expression. And it is proved validity of this numerical formula by thrust measurement system. Two phase driver is composed. It is verified validity of numerical formula that measure waveform of electric current and voltage that is supplied in each phase.
Linear induction motor
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This paper describes the optimization of the magnetic dimensions for maximum thrust for a High Thrust Density Transverse Flux Linear Motor (HDTFLM). HDTFLM is a novel structure with combination of a typical High Thrust Density Linear Motor (HDLM) and Transverse Flux Linear Motor (TFLM) structure. The magnetic circuit of HDTFLM is different compared to conventional three phase linear motor because it has independences magnetic circuit on each phase. The optimization of maximum thrust is achieved by varying the thickness and height of the permanent magnet. This paper reports the optimized dimensional values for the HDTFLM structure for maximum thrust development.
Linear induction motor
Magnetic circuit
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The cylindrical permanent-magnet linear motor (PMLSM), as a linear driving device, produces the electromagnetic force to cause linear motion through the electricity directly and does not need additional mechanical conversion devices to transform rotation to linear motion. This paper calculates the electromagnetic distribution and force of two kinds of cylindrical PMLSM by ANSYS, and compares and analyzes their thrust performance. It is concluded that a radially magnetized cylindrical PMLSM is suitable for the applications requiring smaller speed variation while an axially magnetized one possesses a bigger thrust and thrust variation yet.
Linear motion
Axial symmetry
Linear induction motor
Synchronous motor
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As compared with a mono-polar type linear DC motor (LDM), multi-polar type LDM can have a longer stroke and more thrust with thin shape. However, there is thrust ripple on the multi-polar LDM. In this paper, a design to prevent thrust ripple is discussed. In order to achieve smoother thrust on multi-polar type LDM, the structure of the LDM is set as a 2-phase coil type. This paper clarifies that the thrust ripple of the LDM has a minimum value of 1.68%, a pole pitch of 15 mm, a coil width of 12 mm and a permanent magnet width of 10 mm.
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The mechanism-empirical hybrid model is one of the most popular methods for on-line dynamic modeling. In this paper, the method is applied to the thrust fluctuation suppression technology of permanent magnet synchronous linear motor. Firstly, the disturbance factors causing linear motor thrust fluctuation are analyzed, and the mechanism model of linear motor thrust fluctuation is established to suppress thrust fluctuation. Then, the linear motor empirical model is established by obtaining thrust fluctuation data from acceleration sensor, and the thrust fluctuation is suppressed by empirical model based on the mechanism model. Finally, taking a 12-slot and 14pole permanent magnet synchronous linear motor as an example, the simulation and experimental results show that the proposed method can effectively suppress the thrust fluctuation of the linear motor.
Synchronous motor
Linear acceleration
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An important drawback in PM linear synchronous motor applications is the high normal force (compared to the thrust developed by the motor itself) due to the stator-cursor magnetic attraction. A new linear motor with a very high thrust/normal force ratio has been designed and a prototype has been constructed. The motor is a PM linear synchronous motor with the PMs mounted on an ironless cursor. The motor performance have been evaluated in terms of generated forces (thrust and normal force) considering the values obtained by simulations and laboratory tests. Laboratory generated forces measurements have been performed by an "ad hoc" instrumentation described in the paper itself.
Normal force
Synchronous motor
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Permanent magnet linear synchronous motors (PMLSMs) have been widely used as the driving source to satisfy requirements such as the speeding up of transportation systems. PMLSM is expected for the higher thrust and higher speed, thus, the thrust force characteristic is one of investigative hot spots to PMLSM. This paper presents the electromagnetic thrust force characteristics in different conditions including: frequency, length of air-gap, U / f and number of poles. The analysis results provide a foundation for the optimum design of PMLSM.
Synchronous motor
Air gap (plumbing)
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