Performance analysis of the 2DoF direct drive induction motor applying composite multilayer method

et al. 2019

Energies

Self Cite

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.

Section: Structure and Parametersmentioning

confidence: 99%

“…A two-degree-of-freedom direct-drive induction motor (2DoFDDIM) [1][2][3][4] that produces rotary, linear, and helical motions has widespread applications in special industrial products, such as industrial robot arms, drill presses, and carving machines. A copper-coated solid rotor is applied to 2DoFDDIM to improve the motor output torque.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

Energies

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“…Reference [12] developed a semi-analytical 3D model based on Fourier analysis; this model can calculate the fringe field in a 3D slotted structure. Moreover, several complex propagation constants have been proposed to calculate composite rotor parameters [13,14].…”

Section: Introductionmentioning

confidence: 99%

Equivalent Circuit Model of Novel Solid Rotor Induction Motor with Toroidal Winding Applying Composite Multilayer Theory

et al. 2019

Applied Sciences

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In this work, a novel solid rotor induction motor with toroidal winding (N-TWSRIM) is proposed and its structure and main structural parameters are given. The operating principle is analyzed in accordance with the movement of the armature magnetic field at different times. An equivalent circuit model (ECM) of the N-TWSRIM is established based on composite multilayer theory to analyze and calculate motor performance quickly and accurately. Electromagnetic performance, which includes output torque, stator current, and power factor under different slip, is calculated with ECM, and its results are compared with those of the finite element method. A prototype of the N-TWSRIM is built and experimented on to validate the correctness of the operating principle and ECM. Experimental results on stator current and torque are consistent with the finite element and analytical results.

“…Two-degree-of-freedom motors, which produce rotary, linear and helical motions, are widely applied in the industrial fields of robots and automobiles. A two-degree-of-freedom direct drive induction motor (2DoFDDIM) consists of a rotary armature, linear armature, and solid rotor coated with a thin copper layer [1][2][3][4][5] and has the advantages of a simple structure and high mechanical integration. However, this motor has the disadvantages of high rotor loss and low efficiency.…”

Section: Introductionsmentioning

confidence: 99%

Equivalent Circuit Parameter Calculations and Characteristics Analysis of 2-DoF Direct Drive Induction Motor with a Slotted Solid Rotor

Si²,

et al. 2019

Applied Sciences

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In this paper, a modified equivalent circuit model (ECM), which considers the effects of an arc-shaped stator structure and saturation, is presented to calculate the characteristics of a two-degree-of-freedom direct drive induction motor (2DoFDDIM). The motor has a novel slotted solid rotor (SSR), which is slotted along the axial and circumferential directions, and copper is cast in the slots. The SSR is equivalent to a cage rotor by analyzing the current distribution using the circuit diagram. The corrected ECM parameter expressions of a cage rotor are proposed to calculate the SSR parameters. The characteristics obtained by ECM and finite element method are compared to verify the accuracy of the modified ECM. This paper provides reference for calculating the parameters of the induction motor with SSR.