In heavy duty drives in the range of hundreds kW, like cement and minerals industries, wound rotor induction motors are used. Important users make use of hundred of such drives, summing hundreds of MW. This type of motors have technical capabilities to easily operate at variable speed. Despite this simple capability, the large amount of losses which occur at low speeds determine the users to us...

This paper presents a comparative study of two types of wound field three-phase switched-flux machine (SFM) with non-overlap winding and salient rotor. Both armature and field winding are located on the stator and rotor is composed of only stack of iron. Non-overlap armature and field windings and toothed-rotor are the clear advantages of these machines as the copper losses gets reduce and roto...

An effective approach for optimizing the rotor contour variable reluctance (VR) resolver is presented. Using this approach, procedure divided into two parts: establishment of initial shape curve, and then computation optimization. In order to simplify process former, a function constructed. And latter carried out by Taguchi optimization method finite element (FEM). example 3–10 VR used present ...

Wound retraction system (WR; Alexis Wound Retractor, Applied Medical, CA, USA), designed for laparoscopic abdominal surgery, is instrumental in offering retraction and protection when an organ or specimen requires removal through a small incision. We performed lobectomy or segmentectomy with systematic lymph nodes dissection by video-assisted mini-thoracotomy for patients with primary lung canc...

Effective condition monitoring of induction motors requires knowledge of the number of rotor slots and the rotor speed. These were primarily obtained in the literature by multiple measurements and using design knowledge of the motor under test. Furthermore, the earlier studies have mainly concentrated on stator current analysis. This paper investigates the use of the stator current, axial flux,...

Since its invention by Nikola Tesla in 1888, the alternating-current (AC) motor has been a critical driver for the industrial age. One of his original three patents was the wound rotor induction motor (WRIM). Later, Westinghouse refined the design of the wound rotor motor to permit control of the speedtorque characteristics of the machine. This paper discusses a new advancement in Pulse Width M...

Rotating electrical machines play an important role in the world’s industrial life. Hence there is a strong demand on their reliable and safe operation. Their faults and failures can lead to excessive downtimes and generate enormous costs in reduced output, emergency maintenance and lost revenues. Therefore the fault detection methods of electrical machines are of real interest. For the rotor f...

Abstruct In this paper field-oriented control of a doubly-fed wound rotor induction machine without shaft position sensors is presented. The stator is directly connected to the constant frequency three phase grid and the rotor currents are appropriately controlled to vary the slip power thereby enabling variable speed constant frequency operation. Instead of using dynamic angle controllers for ...

An autonomous induction generator (IG) with an asymmetric configuration, in which both the stator and the rotor are single-phase, is often formed when a triple-phase wound rotor loses connection to a winding component while running. The machine still works and is shown to be capable of generating modulated waveforms. Equations can help as an IG design guideline. The first harmonics of the mutua...