Long primary linear drive for material handling

Mihalachi, Marius; Leidhold, Roberto; Mutschler, P.

doi:10.1109/icems.2009.5382805

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…These two coefficients are used to correct the secondary resistance and excitation reactance, respectively. The T in Equations ( 5) and ( 6) is obtained by (7) as follows:…”

Section: Transverse Analytical Model Of Dlimsmentioning

confidence: 99%

“…The wide range of velocity and acceleration of the linear induction motor (LIM) avoids the intermediate transmission mechanism of linear motion, which reduces the mechanical losses and stresses and improves the system's reliability [1]. The LIMs have been utilized widely in industrial applications such as aircraft electromagnetic launch or accelerator systems [2,3], transportation systems [4][5][6], handling systems [7], new microgravity drop tower systems [8], etc.…”

Section: Introductionmentioning

confidence: 99%

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A Novel, Improved Equivalent Circuit Model for Double-Sided Linear Induction Motor

et al. 2021

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A novel, improved equivalent circuit model of double-sided linear induction motors (DLIMs) is proposed, which takes the skin effect and the nonzero leakage reactance of the secondary, longitudinal, and transverse end effects into consideration. Firstly, the traditional equivalent circuit with longitudinal and transverse end effects are briefly reviewed. Additionally, the correction coefficients for longitudinal and transverse end effects derived by one-dimensional analysis models are given. Secondly, correction factors for skin effect, which reflects the inhomogeneous air gap magnetic field vertically, and the secondary leakage reactance are derived by the quasi-two-dimensional analysis model. Then, the proposed equivalent circuit is presented, and the excitation reactance and secondary resistance are modified by the correction coefficients derived from the three analytical models. Finally, a three-dimensional (3D) finite element model is used to verify the proposed equivalent circuit model under varying air gap width and frequency, and the results are also compared with that of the traditional equivalent circuit models. The calculated thrust characteristics by the proposed equivalent circuit and 3D finite element model are experimentally validated under a constant voltage–frequency drive.

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“…These two coefficients are used to correct the secondary resistance and excitation reactance, respectively. The T in Equations ( 5) and ( 6) is obtained by (7) as follows:…”

Section: Transverse Analytical Model Of Dlimsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel, Improved Equivalent Circuit Model for Double-Sided Linear Induction Motor

et al. 2021

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“…The second alternative is to feed each primary segment with a dedicated inverter, so that a large number of primary segments imply a large number of inverters. The physical distribution of the components for the second alternative produces two other possibilities: the long primary topology with centralised controllers [15] and the long primary topology with distributed controllers [16].…”

Section: Introductionmentioning

confidence: 99%

Short primary linear drive designed for synchronous and induction operation in different sections

Neto¹,

Mutschler²,

Pontes³

2014

IET Electric Power Applications

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The potential for very long tracks, multiple vehicles travelling at high speed, high positioning repeatability and rapid acceleration turns the short primary linear drive into a good candidate for use in material transfer and processing lines. To implement this system, the linear motor was designed for synchronous and induction operation, since the costs can be considerably reduced by using a simple induction rail at the long transporting sections, instead of permanent magnets. This study is focused on the vehicle motion control strategy of a short primary linear drive, in order to regulate the speed without jerks. The implemented control algorithm for both the operations is based on a field oriented control, which uses a moving AB-reference frame. The position information was obtained by using a magneto-resistive incremental encoder, which was mounted on the vehicle, and a magnetic linear scale, which was installed along the passive track. Furthermore, force generation which depends on the vehicle's position will be discussed. Finally, experimental tests are performed to demonstrate the feasibility of the employed control strategy.

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“…The long primary configuration allows a passive and lightweight vehicle (secondary), avoiding brushes and cables to transfer energy and information. For long distances, the primary is arranged in several electrical independent segments [9]. On the other hand, the short primary configuration uses the winding mounted on the moving part (active vehicle) to produce the traveling wave, the secondary as guide way (reaction rail or stationary magnets), and the energy and information should be transmitted contactless to the active vehicle.…”

Section: Introductionmentioning

confidence: 99%

“…This topology has some advantages in comparison with [9], such as: the number of converters and vehicle controller units is equal to the number of vehicle plus a stationary medium frequency inverter, the reactive power in the on board inverter is reduced, the position sensor is attached to the active vehicle, thus one sensor per vehicle, and actual position data should be transmitted to a stationary central controller unit which generates and sends position reference data for all moving vehicles. To fulfill the communication demand, wireless network or signal carrier transmission [11] may be used.…”

Section: Introductionmentioning

confidence: 99%

Combined operation of short-primary permanent magnet linear synchronous motor and linear induction motor in material handling applications

Neto

Mutschler

2012

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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In material handling applications where high precision, very long tracks and closed paths are required, short primary linear drives are proposed. The short primary type uses an active vehicle (moving winding) on a passive track (stationary magnets or induction rail). To implement this topology, this paper presents a combined operation of a short permanent magnet linear synchronous motor (PMLSM) and a linear induction motor (LIM). The costs can be reduced considerably by using a simple induction rail, instead of permanent magnets on the track. The control unit and converters are mounted on board of the active vehicle. A contactless energy transmission provides the average power and an ultracapacitor bank provides the peak power demanded by the active vehicle via a bidirectional DC-DC converter. The field oriented control, the drive control, the machine model and the control structure are based on field oriented control (FOC) using the rotating ABreference frame. The transition control strategy is described and experimental results demonstrate the transition between sections with permanent magnets and induction rail.

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Long primary linear drive for material handling

Cited by 7 publications

References 3 publications

A Novel, Improved Equivalent Circuit Model for Double-Sided Linear Induction Motor

A Novel, Improved Equivalent Circuit Model for Double-Sided Linear Induction Motor

Short primary linear drive designed for synchronous and induction operation in different sections

Combined operation of short-primary permanent magnet linear synchronous motor and linear induction motor in material handling applications

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