Squirrel-Cage Rotor Design and Manufacturing for High-Speed Applications

Abstract

A high-speed squirrel-cage induction machine requires a totally different design compared to the traditional squirrel cage industrial motor because of the mechanical limitations caused by the high speed. This results in a more complicated rotor construction and expensive material selection, and sets higher standards for the manufacturing precision. The objective of this paper is to demonstrate the design aspects, material selection, and manufacturing of a squirrel cage rotor for high-speed applications. In this paper, the rotor dimensioning approach based on equations and data analysis is presented. Rotor material selection and construction topology influence on the electrical machine design are discussed. The results are illustrated with the design of a 6 kW, 120 000 rpm induction machine for a turbo-circulator. The rotor parameters' influence on the electromagnetic performance of the designed machine is demonstrated. Mechanical stresses for different topologies are studied with Finite Element Method (FEM) analysis. Several manufacturing methods for producing a high precision rotor are described and compared. The presented rotor design approach, which enables high electromagnetic performance and robust construction, is verified by the testing of a prototype.

The Investigation of Motor Production Test Indicators in Qualitative Research Methods

“…A study mentions condition monitoring technology for rotor fault detection, which can be used in the production process to accurately diagnose defective products [8], or special signals injected into the stator terminals by a filter to stimulate rotor fault modes [9]. The rotor size, material and topology were studied, and the torque, mechanical constants and tangential hard force values of the squirrel-cage rotor volume were analyzed, and a solution for high-speed operation was proposed [10]. As for how manufacturers should strive to comply with the minimum energy consumption standards, research indicates that the rotor parameters change with slip, and a new method for separating the short-circuit reactance in the stator and rotor components has also been proposed [11].…”

Asenkron motorlarda yapay nöral ağlar ile/olmadan dolaylı alan yönlendirmeli kontrol ve doğrudan tork kontrolünün karşılaştırması

“…Nowadays, asynchronous motors are used in elevators, textile looms, eccentric presses, CNC looms, electric or hybrid cars. In addition, unlike DC motors, asynchronous motors can be used for many years as there is no brush structure [1] Asynchronous motors are the machines that convert electrical energy perfectly into mechanical energy besides the advantages mentioned above. However, mechanical energy is often required at different speeds and moments.…”

Synchronous Reluctance Motors With an Axially Laminated Anisotropic Rotor as an Alternative in High-Speed Applications

“…Therefore, the rotor can be additionally equipped with a highly conductive nonmagnetic metal squirrel cage (or only end rings to minimize the end effect) to increase the torqueproducing capability and efficiency. Consequently, the rotor will be more complicated, and either its mechanical robustness will decreases, or more expensive materials and much more challenging manufacturing methods must be used [10]. In an IM equipped with a squirrel cage, the rotor maximum surface speed is 200 m/s, which is half of that of the IM with a solid rotor, where the rotor maximum surface speed is 400 m/s [11].…”