Optimum design of brushless tubular linear machines

Eastham, J.F.; Akmese, R.; Lai, Hang–Chin

doi:10.1109/20.104793

Cited by 34 publications

(11 citation statements)

References 2 publications

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“…is defined as the winding factor of the th harmonic and is given by (8) and is the coefficient related to the th harmonic in the radial field distribution and is given by (9) Hence, the induced emf per phase is obtained as (10) where is the velocity of the armature. Fig.…”

Section: Emf and Force Predictionmentioning

confidence: 99%

“…However, while this allows the relationship between critical design parameters and machine performance to be established analytically, it suffers from problems associated with model inaccuracy, particularly when flux leakage is significant and the flux paths are complex. Therefore, numerical analysis of the field distribution and evaluation of performance [7]- [9] are also employed. However, while techniques such as finite-element analysis provide an accurate means of determining the field distribution, with due account of saturation, etc., they remain time consuming and do not provide as much insight as analytical solutions into the influence of the design parameters on the machine behavior.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Design Optimization of an Improved Axially Magnetized Tubular Permanent-Magnet Machine

Wang

Howe

Jewell

2004

IEEE Trans. On Energy Conversion

107

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Abstract-This paper describes the analysis and design optimization of an improved axially magnetized tubular permanentmagnet machine. Compared with a conventional axially magnetized tubular machine, it has a higher specific force capability and requires less permanent-magnet material. The magnetic field distribution is established analytically in the cylindrical coordinate system, and the results are validated by finite-element analyses. The analytical field solution allows the analytical prediction of the thrust force and back-electromotive force (emf) in closed forms, which, in turn, facilitates the characterization of a machine, and provides a basis for design optimization and system dynamic modeling.Index Terms-Linear motors, permanent-magnet motors, system analysis and design.

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Section: Emf and Force Predictionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis and Design Optimization of an Improved Axially Magnetized Tubular Permanent-Magnet Machine

Wang

Howe

Jewell

2004

IEEE Trans. On Energy Conversion

107

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“…Among the various topologies available in linear motors, the PMTLM offers the highest force capability [2] and exhibits excellent servo characteristics [3]. Due to the fact that tubular motors have zero end winding, zero net attractive force between stator and armature [4], [5] and geometrical similarities to a ball screw, the PMTLM is a potential alternative to the ball screw in machine tool applications.…”

Section: Introductionmentioning

confidence: 99%

Novel tooth design for a tubular linear motor for machine tool axis

Commins

Moscrop

Cook

2011

2011 IEEE International Conference on Mechatronics

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Permanent magnet tubular linear motors have shown potential for use as direct drives in high precision machine tools. These devices are capable of replacing the traditional ball screw, given their ability to overcome or reduce many of the fundamental mechanical properties that limit the precision performance of the ball screw. However, given the desire from industry to increase speed and acceleration, the physical size of the motor must be minimised while maintaining high force output to increase bandwidth in high precision applications. This paper presents a new optimal tooth design to reduce the frame size of a slotted tubular linear motor. Several design aspects of the optimal tooth are considered and general solutions are derived. Data from finite element analysis and from an experimental machine is presented to validate the new designs.

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“…The specification of the single phase PM tubular linear actuator, [12], [13], is summarised in Table I and a cross section of the actuator topology with four stator slots, N s , and four effector poles, N p , is illustrated in Fig. 1.…”

Section: Specification Of Actuator Case Studymentioning

confidence: 99%