Optimal Structure Design for Minimizing Detent Force of PMLSM for a Ropeless Elevator

Lee, Sang-Geon; Kim, Sung-An; Saha, Subrato; Zhu, Yu-wu; Cho, Yun‐Hyun

doi:10.1109/tmag.2013.2277544

Cited by 56 publications

(27 citation statements)

References 9 publications

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“…ECAUSE of its high velocity, no transmission, large force, wide travel range and rapid dynamic response characteristic, the permanent magnet (PM) linear synchronous motor (PMLSM) is more and more used in commercial, industrial, and military applications [1][2][3][4][5]. For some scanning system and radar system, a rotary motor with gear box is usually adopted to realize the limited angular movement, which brings some drawbacks, such as occupying large space, bringing transmission error and having low response performance.…”

Section: Introductionmentioning

confidence: 99%

Detent Force Reduction of an Arc-Linear Permanent-Magnet Synchronous Motor by Using Compensation Windings

Zhao

Liu

et al. 2017

IEEE Trans. Ind. Electron.

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Section: Introductionmentioning

confidence: 99%

Detent Force Reduction of an Arc-Linear Permanent-Magnet Synchronous Motor by Using Compensation Windings

Zhao

Liu

et al. 2017

IEEE Trans. Ind. Electron.

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“…In spite of large load situations, the machine is often required to work for a certain period of time for overload operations with disturbances. The force characteristics of LMs are often nonlinear, and some compensation or linearization schemes should be introduced to reduce the force ripples to obtain a smooth force output profile [7]. Therefore, the capacity and accuracy of the force control from a single LM alone sometimes cannot be guaranteed.…”

Section: Introductionmentioning

confidence: 99%

“…The objective of the optimization was to reduce the motor's weight while maximizing the thrust force as well as minimizing the detent force of the motor, and it was verified by a finite element analysis and experimental results. For elevator applications, an optimal structure design and magnetic force analysis that employs LSPMMs are presented in [7]. A multi-air gap LSPMM for aeronautical applications is designed and optimized for improved force output performance in [10].…”

Section: Introductionmentioning

confidence: 99%

Complimentary Force Allocation Control for a Dual-Mover Linear Switched Reluctance Machine

et al. 2017

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This paper inspects the complementary force allocation control schemes for an integrated, dual-mover linear switched reluctance machine (LSRM). The performance of the total force is realized by the coordination of the two movers. First, the structure and characteristics of the LSRM are investigated. Then, a complimentary force allocation control scheme for the two movers is proposed. Next, three force allocation methods-constant proportion, constant proportion with a saturation interval and error compensation, and the variable proportion allocation strategies-are proposed and analyzed, respectively. Experimental results demonstrate that the complimentary force interaction between the two movers can effectively reduce the total amount of force ripples from each method. The results under the variable proportion method also show that dynamic error values falling into 0.044 mm and −0.04 mm under the unit ramp force reference can be achieved. With the sinusoidal force reference with an amplitude of 60 N and a frequency of 0.5 Hz, a dynamic force control precision of 0.062 N and 0.091 N can also be obtained.

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“…A simple approach is to adjust the PM pole pitch [9], [10]. For the double-sided PMLSM, a promising option is to optimize the PM group shifting length [11], [12]. In order to reduce the end effect force, a common strategy is to design the suitable stator length [13]- [15].…”

Section: Introductionmentioning

confidence: 99%

Detent Force Compensation for PMLSM Systems Based on Structural Design and Control Method Combination

Wang

Pan

2015

IEEE Trans. Ind. Electron.

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Abstract-As direct-drive actuators, permanent magnet linear synchronous motors (PMLSMs) are widely used in high velocity and high precision applications. The detent force, however, can deteriorate the performance, even excite the mechanical resonance. This paper focuses on a novel detent force compensation scheme for PMLSM systems through a combination of structural design and control method. First, due to the bandwidth constraint of the control system, eliminating high frequency ripples is unfeasible; skewed permanent magnets (PM) considering an optimal skewing length are designed to suppress high order harmonic components. Second, based on the model of PMLSM with skewed PMs, a linearization observer is derived and applied independently to the velocity controller for further diminishing low order harmonic components. To facilitate implementation in the digital control system, a discretization method taking account of estimated errors is designed. Through the online calculation, the estimated detent force is injected to the control system in a feedforward way. To tune the proposed scheme properly, the convergence of the algorithm is analyzed by utilizing Lyapunov stability theory. Simulation studies are performed to prove the effectiveness of the proposed method, and experiments are provided to confirm the theoretical analysis and simulation results.Index Terms-Permanent magnet linear synchronous motors (PMLSMs), detent force, skewed permanent magnet, discretetime linearization observer, stability analysis.

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Optimal Structure Design for Minimizing Detent Force of PMLSM for a Ropeless Elevator

Cited by 56 publications

References 9 publications

Detent Force Reduction of an Arc-Linear Permanent-Magnet Synchronous Motor by Using Compensation Windings

Detent Force Reduction of an Arc-Linear Permanent-Magnet Synchronous Motor by Using Compensation Windings

Complimentary Force Allocation Control for a Dual-Mover Linear Switched Reluctance Machine

Detent Force Compensation for PMLSM Systems Based on Structural Design and Control Method Combination

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