Abstract
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.
Highlights
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)
In Ref. [9], a novel slotted solid rotor (SSR), which is slotted along the axial and circumferential direction on a smooth solid mover surface first and copper is cast in the slots was applied to the 2DoFDDIM, and the characteristics were analyzed through finite element method (FEM)
The motor characteristics of the rotary part are calculated on the basis of the ECM, i.e., stator of the motor performances, the characteristics can be obtained by the following expressions [10]
Summary
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). 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. This motor has the disadvantages of high rotor loss and low efficiency. [9], a novel slotted solid rotor (SSR), which is slotted along the axial and circumferential direction on a smooth solid mover surface first and copper is cast in the slots was applied to the 2DoFDDIM, and the characteristics were analyzed through FEM.
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