Mathematical Model of Two-Degree-of-Freedom Direct Drive Induction Motor Considering Coupling Effect

Si, Jikai; Xie, Lujia; Han, Junbo; Feng, Haichao; Cao, Wenping; Hu, Yihua

doi:10.5370/jeet.2017.12.3.1227

Cited by 7 publications

(9 citation statements)

References 15 publications

(13 reference statements)

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“…As well as, from the figure 15(b) the ripple of rotary torque under different voice coil current is 0.6%. Compared with [4][5][6][7][8][9][10][11], the proposed model has lower torque ripple.…”

Section: ) Fem Analysis Of Rotary Torquementioning

confidence: 99%

“…Moreover, because a doubly salient topology is utilized, huge rotary torque ripple and linear force ripple are also issues that need to be overcome. Another 2DoF RL motor [6,7] is composed of two arc-shaped stators of the rotary and linear parts, respectively, and a solid rotor coated with a copper layer. Moreover, the proposed 2DoF split-stator induction motor with a solid mover is easy to manufacture at low cost, although the efficiency should be improved further for an industrial application.…”

Section: Introductionmentioning

confidence: 99%

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Design of a Rotary-Linear Motor With Unipolar SPM and Voice Coil Structure

Xing

Kwon

2020

IEEE Access

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In this paper, a rotary-linear motor that achieves rotary and linear motions with a simple oneair-gap structure, low rotary ripple, and smooth linear force is proposed. The proposed motor combines a five-phase unipolar surface-mounted permanent-magnet (USPM) and a voice coil structure to simplify the motor structure, which motor can be named as rotary-linear surface-mounted permanent-magnet voice coil motor (RL-SVCM). And because of the characteristics of the rotary five-phase armature circuit and linear voice coil circuit, the proposed motor can provide low rotary ripple and smooth linear force. For designing the motor, the magnetic equivalent circuit (MEC) method is used to study the relationship between the linear force performance and motor structure parameters, and the effect of the flux bridges on the linear force and rotary torque. Due to uncertain variables in MEC, the FEM method is used to analyze the precise output result of rotary torque and linear force, and non-interaction between rotary and linear motions.

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Section: ) Fem Analysis Of Rotary Torquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a Rotary-Linear Motor With Unipolar SPM and Voice Coil Structure

Xing

Kwon

2020

IEEE Access

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“…One category is 2DoF motors with crossed RL magnetic fields. Many studies have investigated this type of system, including studies on helicalwinding 2DoF motors [4,5], salient-pole 2DoF motors [6,7], and double-stator 2DoF motors [8][9][10]. In reference [11,12], high-temperature superconducting field windings are imbedded in the stator to achieve the linear motion, but special working conditions are needed.…”

Section: Introductionmentioning

confidence: 99%

A Rotary-Linear SPM Voice Coil Motor With PM Flux Bridges for Output Performance Improvement

Xing

Kwon

et al. 2021

IEEE Access

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This paper proposes a rotary-linear surface-mounted permanent magnet (PM) voice coil motor (RL-SVCM) with PM flux bridges in place of the iron flux bridges in a traditional RL-SVCM for enhancing average torque and force ripple but slight damage of torque ripple and average linear force. The iron flux bridges in a basic RL-SVCM cannot participate in the generation of rotary torque. In contrast, the PM flux bridges in the proposed RL-SVCM can participate in the generation of rotary torque. The magnetic equivalent circuit (MEC) is used to analyze the magnetic circuits of the basic and proposed models. The results explain the reasons for the performance improvements achieved by the proposed motor. The finite element method (FEM) is used to derive the precise output performance of the basic and proposed motors. Additionally, a prototype of the proposed RL-SVCM with PM flux bridges was manufactured for experimental verification. Close agreement between the experimental results and FEM results validates the feasibility of the proposed RL-SVCM.

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“…In this study, a 2DoFDDIM is transformed into two single-degree-of-freedom motors, wherein the coupling effect is disregarded [11,12]. The rotary part is selected as a research object to calculate the rotor loss.…”

Section: Introductionmentioning

confidence: 99%

Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive Induction Motor

Feng

et al. 2019

Energies

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A two-degree-of-freedom direct-drive induction motor (2DoFDDIM), whose solid rotor is coated with a copper layer, is capable of linear, rotary, and helical motions and has widespread applications. For solid-rotor motors, the calculation and analysis of rotor total eddy current loss (TECL) are crucial in studying the factors causing such a loss and possible loss reduction methods. In this study, a new nonlinear analytical method considering the saturation of the rotor core is proposed to solve the fundamental magnetic field. The new method divides the time period into segments. The magnetic field distribution at any time is obtained using Maxwell equations. The eddy current losses in the copper layer and rotor core caused by the fundamental magnetic field are calculated. The surface eddy current losses in the copper layer and rotor core caused by harmonics are calculated using a 2D analytical method. TECL is determined by the sum of eddy current and surface eddy current losses. Coefficients are utilized to consider eddy, saturation, and end-region effects when calculating the rotor core TECL. The new method is verified using 3D FEM, and the results show the proposed method has higher accuracy than the original method. The errors of the rotor core and copper layer TECLs are less than 6% and 7.3%, respectively.

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Mathematical Model of Two-Degree-of-Freedom Direct Drive Induction Motor Considering Coupling Effect

Cited by 7 publications

References 15 publications

Design of a Rotary-Linear Motor With Unipolar SPM and Voice Coil Structure

Design of a Rotary-Linear Motor With Unipolar SPM and Voice Coil Structure

A Rotary-Linear SPM Voice Coil Motor With PM Flux Bridges for Output Performance Improvement

Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive Induction Motor

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