A Feasibility Study on a New Doubly Salient Permanent Magnet Linear Synchronous Machine

Chung, Shi-Uk; Lee, Hong-Joo; Woo, Byung-Chul; Kim, Ji‐Won; Lee, Ji-Young; Moon, Seung‐Ryul; Hwang, Sang-Moon

doi:10.1109/tmag.2010.2042284

Cited by 61 publications

(22 citation statements)

References 3 publications

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“…Consequent pole (CP) arrangement for PM motor is that one PM pole is set between two salient ferromagnetic iron poles and saves half the number of PM poles, thereby reducing motor costs. So, the CP structure is a cost-effective solution and has been studied and investigated extensively to reduce PM usage and achieve acceptable performance in PM motor [19]- [25], vernier machine [26], [27], flux-reversal machine [28], [29], and coaxial PM gear [30], [31]. PMLSM with CP poles in secondary plate has high utilization coefficient of rare earth PMs.…”

Section: Introductionmentioning

confidence: 99%

Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

Sun

et al. 2020

IEEE Access

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Permanent magnet linear synchronous motors (PMLSM) has the advantages of high speed, high thrust density, high power density, high power factor and high reliability. In order to save permanent magnet (PM) materials and reduce magnetic leakage, a new type of PMLSM with Halbach consequent-pole (HCP) structure is presented, which has great potential for application to the ropeless elevator system. By using extensive finite element analysis (FEA), the electromagnetic properties of the proposed HCP-PMLSM, including magnetic field, back electromagnetic force (back-EMF), thrust force and cogging force are simulated and compared with the consequent pole PMLSM (CP-PMLSM) and surface-mounted pole PMLSM (SP-PMLSM). The comparison results show that the proposed HCP configuration can reduce substantial PM material and increase the air-gap magnetic field effectively. Then, the influence trend of HCP parameters such as pole thickness, pole width ratio, auxiliary PM width and magnetism angle, are studied and analyzed for evaluating the output performance in HCP-PMLSM. On this basis, Response surface method (RSM) is employed to optimize the HCP parameters with the target of maximum average thrust, minimum thrust ripple, and highest PM utilization. Furthermore, a double-sided pole shift method was proposed to significantly suppress the thrust fluctuation of HCP-PMLSM. Lastly, experimental results are provided to verify the investigation.

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Section: Introductionmentioning

confidence: 99%

Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

Sun

et al. 2020

IEEE Access

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“…This is because that the consequent-pole (ironpole) can provide magnetic path for the flux produced by field or suspending windings, which is passed easier than the magnetic path including PM. Moreover, the consequent-pole rotor is investigated to reduce the PM volume of the PM machines with fractional-slot concentrated winding (FSCW) for low-speed applications [11][12][13][14][15][16][17][18]. As pointed out in [13], the FSCW consequent-pole PM (CPM) machine can obtain similar electromagnetic performance with 33% less PM volume than the conventional FSCW surface-mounted PM (SPM) machine.…”

Section: Introductionmentioning

confidence: 99%

“…As pointed out in [13], the FSCW consequent-pole PM (CPM) machine can obtain similar electromagnetic performance with 33% less PM volume than the conventional FSCW surface-mounted PM (SPM) machine. These reported literature indicates that consequent-pole in rotor-PM machine [11][12][13][14][15][16] and stator-PM machine [17,18], all have a great potential for the low-cost application.…”

Section: Introductionmentioning

confidence: 99%

Analytical prediction of optimal split ratio of consequent‐pole permanent magnet machines

Wang

2017

IET Electric Power Applications

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For consequent-pole permanent magnet (CPM) machines, the permanent magnet (PM)-arc ratio and split ratio have great influence on the output torque. This study establishes general relationship of the output torque/torque density with PM-arc ratio and split ratio considering the effects of slot/pole number combinations and the tooth-tips. In addition, both the optimal PMarc ratio and split ratio for maximising the torque density are analytically derived and confirmed by finite-element analysis. It is found that the optimal PM-arc ratio is determined by the ratio of the airgap length to the PM thickness. It is demonstrated that the optimal split ratio depends on the ratio of average airgap flux density below one slot to maximum flux density in the stator iron k B γ and the number of slots for the slots per pole q ≤ 1.5 or the number of poles for q > 1.5. Moreover, it is found that the optimal split ratio decreases with the ratio k B γ, which depends on the PM thickness and PM-arc ratio, and it is reduced when the effect of the stator tooth-tips is taken into consideration. The experimental results on the 12-slot/10-pole CPM machine are given to verify these analyses.

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“…The same topologies with a role reversal in terms of the stator and rotor can be applied for linear machines in order to minimize the total number of PMs and coils required for drive operation. Research has been progressing in this direction and a few designs such as the doubly-salient linear PM motors [3], fluxswitching linear synchronous motors [4], [5] and flux-reversal linear synchronous motors (FRLSM) [6] have been proposed in literature. In this paper, a double-sided design of a FRLSM is introduced and it is shown through finite-element (FE) analysis that the thrust producing capability of the proposed design is much higher than conventional FRLSM topology.…”

Section: Introductionmentioning

confidence: 99%

Doubled-sided FRLSM for long-stroke safety-critical applications

Gandhi

Mohammadpour

Sadeghi

et al. 2011

IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society

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Permanent-magnet linear synchronous motors (PMLSMs) are increasingly preferred in the industry wherever linear motion is required because of their high reliability and excellent dynamic characteristics. In this paper, a modified doublesided design of a linear motor for long-stroke applications is introduced. The proposed motor utilizes a flux-reversal topology and hence requires lesser number of permanent magnets (PMs) for operation than PMLSMs with magnet tracks. Comparison is made with conventional single-sided flux-reversal motor configuration, which shows 33% increase in thrust producing capability in the proposed design without an increase in excitation sources. Additionally, mover weight is reduced significantly, which can improve the dynamic characteristics of the motor. A five-phase 5-slot/11-pole flux reversal motor based on the double-sided topology is introduced for use in safety-critical applications. The proposed five-phase motor has low detent force and improved thrust density. I. INTRODUCTIONIn many industrial applications, linear motors are increasingly replacing traditional hydraulic actuators and linear actuators that combine rotary motors and mechanical assemblies. Especially, in applications where longer strokes and higher speeds are required and space is not constrained, PM linear motors offer several advantages such as high expandability, high reliability, good dynamic characteristics and less maintenance. However, commercially available PM motor solutions can become expensive when the length of the stroke increases. With the continuous increase in the cost of rareearth permanent magnets (PMs), the future holds promise for machine designs that require minimum PMs. A design with both the coils and the PMs in the mover can reduce the cost significantly in long-stroke applications. Additionally, such a design (with fewer magnets) ensures that there is less stray magnetic field that can affect other sensitive electronic equipments nearby.Doubly-salient machine topologies such as flux-switching PM machines and flux-reversal PM machines have been discussed in good detail for rotary machines [1], [2]. The same topologies with a role reversal in terms of the stator and rotor can be applied for linear machines in order to minimize the total number of PMs and coils required for drive operation. Research has been progressing in this direction and a few designs such as the doubly-salient linear PM motors [3], fluxswitching linear synchronous motors [4], [5] and flux-reversal linear synchronous motors (FRLSM) [6] have been proposed

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A Feasibility Study on a New Doubly Salient Permanent Magnet Linear Synchronous Machine

Cited by 61 publications

References 3 publications

Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

Analytical prediction of optimal split ratio of consequent‐pole permanent magnet machines

Doubled-sided FRLSM for long-stroke safety-critical applications

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