Instytut Napedow i Maszyn Elektrycznych KOMEL

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Bernatt J.,Instytut Napedow i Maszyn Elektrycznych KOMEL | Bernatt M.,Instytut Napedow i Maszyn Elektrycznych KOMEL
Przeglad Elektrotechniczny | Year: 2016

Exploitation durability of the squirrel cage motor at heavy starting conditions depends on their rotor design. The most reliable induction motor for frequently repeated or long lasting starts is that with idle bars in the rotor. But idle bars design has their disadvantages as well. The idle bars should be massive, they take a pretty large volume of the active part of the rotor. In the paper a special (patented by Komel) rotor design, with short circuited turns in the slots, instead of massive idle bars is presented. Laboratory test results of an experimental squirrel cage 90 kW motor with short circuited turns in their rotor are given. The motor was designed, manufactured and tested at KOMEL Institute, Katowice, in 2014. © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All Rights Reserved.


Baranski M.,Instytut Napedow i Maszyn Elektrycznych KOMEL | Polak A.,Instytut Napedow i Maszyn Elektrycznych KOMEL | Decner A.,Instytut Napedow i Maszyn Elektrycznych KOMEL
Przeglad Elektrotechniczny | Year: 2014

The article presents a method of bearings technical condition evaluate using XY vibration trajectory. Determination of trajectory is made with two transducers placed in the X and Y axes. The amplitude of vibration in the XY plane is always greater than the value recorded for each axle separately. Measuring only one axis does not reflect the maximum amplitude of the vibration of the machine. Reference image of the perfectly smooth bearing is a small diameter circle drawn on the XY plane. Practical application of vibration trajectory in the XY plane method is shown in the example of assessment of bearings with varying degrees of lubricant contamination. The results of tests presented in this paper were obtained during the test of induction 3-phase motor type Sg112M4 with PN = 4 [kW]. Motor was placed on elastic foundation. Research consisted in measuring the vibration velocity ve (RMS) and recording the instantaneous values of vibration acceleration, and drawn a function aX = f(aY). The measurements of instantaneous values of vibration acceleration were made with industrial accelerometers but vibration analyzer was made by authors.


This paper presents two constructions of permanent magnet motors. The first one is cylindrical motor with permanent magnet (IPM), with radial distribution of the main lines of magnetic flux, while the second is axial flux permanent magnet motor. The article compares the ratio of torque density of two constructions, which is defined as torque on the motor shaft obtained from units of mass or volume. The analysis was made having regard to the weight of only the magnetic circuit, as well as the weight of the entire motors. Comparisons were made with regard to comparable working conditions of both machines. In addition, the paper presents the main advantages and disadvantages of both construction for determining the usefulness for use in some applications.


Generators excited with permanent magnets are characterized by simple construction and highest efficiency of all electric machines. These features have determined their wide use in different appliances such as renewable energy sources, e.g. wind power plants. The drawback of these generators is due to the fact that it is not possible to control the output voltage; this prevents their extensive use in power engineering, since power coefficient cosφ is unmanageable. A summarised review of PM generators' designs is presented in the paper as well as basic theoretical issues of these generators. Next, different ways of making it possible to control the output voltage in these machines have been shown. In author's opinion, the most advantageous method of stabilising output voltage in such machines is to use a hybrid-type generator. At the design stage, the PM generator may be constructed so that the excitation control range should be limited in accordance with the demands set by a given application. © 2014, (publisher). All rights reserved.


Baranski M.,Instytut Napedow i Maszyn Elektrycznych KOMEL
Przeglad Elektrotechniczny | Year: 2014

The paper presents a new vibration diagnostic method designed for diagnose of permanent magnets (PM) generators. Those machines are commonly used in small wind turbines. Specific structural properties of machines excited by permanent magnets are used in this method - electromotive force (EMF) generated due to vibrations. In this article several issues will be discussed: the method genesis, the similarity of permanent magnet machines to vibration sensor, mathematical model, and results of simulation and laboratory tests. The method is the subject of patent application No P.40566. (Innovative vibration diagnostic method of permanent magnets generators detecting of vibrations caused by unbalance).


The paper presents a vibration diagnostic method designed for permanent magnets (PM) generators with point operation asymmetry. Specific structural properties of machines excited by permanent magnets are used in this method - electromotive force (EMF) generated due to vibrations. In this article several issues will be discussed: the similarity of permanent magnet machines to vibration sensor, calculations, results of simulation and laboratory tests. The method is the subject of patent application. © 2015, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.

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