**5. References**


K. Yamasaki, Modification of 2D Nonlinear time-stepping analysis by limited 3D analysis for induction machines, IEEE Trans. on Magnetics, vol.33, no.22, 1997

**Chapter 10** 

© 2012 Amiri and Mendrela, licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

© 2012 Amiri and Mendrela, licensee InTech. This is a paper distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use,

distribution, and reproduction in any medium, provided the original work is properly cited.

**Induction Motors with Rotor Helical Motion** 

A demand for sophisticated motion control is steadily increasing in several advanced application fields, such as robotics, tooling machines, pick-and-place systems, etc. These kinds of applications require implementation of at least two or more conventional motors/actuators, often operating with different type of mechanical gear. Electric motors/actuators that are able directly perform complex motion (with multiple degrees of mechanical freedom – multi-DoMF) may provide appreciable benefits in terms of

This chapter is organized as follows. Section 2 provides a brief overview of the main typologies of induction motors with two degrees of mechanical freedom (IM-2DoMF) structure. Section 3 introduces the mathematical model for helical-motion induction motors. Section 4 discusses the phenomenon known end effect caused by finite length of the armature and its negative influences on the motor performance. Section 5 presents a construction of a twin-armature rotary-linear induction motor with solid double layer rotor, its design data and the performance prediction of the motor. The results obtained from FEM modeling are then verified by the test carried out on experimental model of the motor what

**2. Topologies of induction motors with two degrees of mechanical** 

Considering the geometry, three classes of motors can be distinguished:

Several topologies of electromagnetic motors featuring a multi-DoMF structure were investigated in the technical literatures (Mendrela et al., 2003, Krebs, et al., 2008).

Ebrahim Amiri and Ernest Mendrela

performances, volume, weight and cost.

validates the theoretical modeling of the motor.

 Rotary-linear motor – cylindrical geometry Spherical motors – spherical geometry

http://dx.doi.org/10.5772/48056

**1. Introduction** 

**freedom** 

X-Y motors – flat structure

Additional information is available at the end of the chapter

