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This paper presents a new approach for broken rotor bars detection in induction motors. When broken rotor bar occurs, the rotor resistance will increase. Furthermore, thermal effects of rotor resistance are considered to address practical aspects. Therefore, a suitable method to detect broken rotor bar is rotor resistance estimation. An applicable method in state estimation is Cubature Kalman Filter...
Sucker Rod Pump is a prevalent industrial solution in artificial lift applications in oil industries. Linear motors are becoming more popular as they are applied in new applications in various fields. Linear motors may be employed in artificial lift systems by placing a linear motor downhole to drive the reciprocating pump directly. This system is intended to extend the application of reciprocating...
This paper provides an experimental discussion on a power hardware-in-the-loop-simulation (P-HILS) system for a medium-voltage, high-power, high-speed synchronous-motor drive. It consists of two identical modular multilevel double-star chopper-cell (DSCC) converters connected in front-to-front (FTF) without ac-link transformer. One DSCC inverter acts as a “real inverter under test,” while the other...
In this paper is proposed a method for calculating the parameters of an induction motor that determine three points of a mechanical characteristic-nominal, critical and starting. Comparison of the results of the proposed methodology with existing ones is given. Also is proposed to consider modifying the rotor parameters of an asynchronous motor during the start-up. The method gives the required values...
In the paper is used the Simpowersystems program which is used for calculating the static mechanical characteristic and operating characteristics within the range of variation of rotor slippage. Also, the program can be used to determine the starting moment corresponding to the rotor resistance and reactance values in the startup process. This program does not allow for the modification of rotor parameters...
The paper refers to the equipment for the espresso production process and the peculiarities of hydraulic systems and pump functioning. A common myth for newcomers to the espresso machine world is that the rotary vane pump, also known as the permanent displacement pumps are superior to the vibrating armature pumps. This is not always true and these two pumps, which are the most popular ones in espresso...
This paper presents a new method of simultaneous estimation of speed and rotor resistance of an induction motor, from a sensorless vector control system. The simultaneous estimation of the speed, rotor flux and of rotor resistance is done by using an adaptive estimator, called the COS observer. To ensure the persistent excitation condition, in the vector control system, over the rotor flux reference,...
In modern transport industry there is a tendency for electric vehicles with independent power supply to increase their amount, particularly it seems to appear in the fast development of electric cars. Nevertheless, there are still some flaws in electric vehicle drives to be improved. The element of an electric drive that limits the performance of the vehicle is almost always power supply. Li-Ion accumulators,...
Energy balance of electromechanical converter of a multi-module structure with a common hollow massive rotor has been considered. Design capacity for the motor module is chosen based on the sum of thermal and mechanical output. For the brake module operating in the mode of opposition circuit only thermal mechanical output can be chosen. These capacities are determined by preliminary thermal and hydrodynamic...
On Multiple-Motor systems fed by Multiple-Converter systems a set of electric motor drives share the load through a common mechanical coupling. Such a coupling is exploited in this paper to realize a sensorless field oriented control, based on a quite common back-emf technique to estimate the rotor flux angular position and an original approach to correct the estimation errors. The technique is based...
Under today's global market requirements, products may be manufactured in a different country than where they are used, and may thus be manufactured to a different standard than that which is required for its intended use. It is important to understand different requirements in order to determine if the product can be used. Considerable alignment between the National Electrical Manufacturers Association...
Temperature rise is one of the main factors that affect the safe operation of electric vehicle. In order to improve the heat efficiency of the motor, the water-cooled motor of circular circumferential waterway for mini electric vehicle was studied as an object in this research, the structural parameters of the channel are optimized and analyzed from the following aspects: the width of the adjacent...
Improved efficiency is the task of the hour. Environmental challenges, which include climate change, global warming and greenhouse gas emission have been fuelling the need to increase energy efficiency in electrical rotating machinery. Furthermore, there is a need to establish a level platform for motor manufacturers globally where they can produce electric machines according harmonized standards...
Rated power of a specific motor is highly dependent on cooling capacity for its own protection system. This paper addresses an effect of counter rotating vortices generated inside a weather-protected housing mounted over a IP23W motor, deteriorating thermal-flow characteristics. Generative process of the vortices was initially investigated with computational fluid dynamics and passive control device...
An adaptive sliding-mode observer is proposed in this paper to update the rotor resistance in indirect field oriented controlled induction motor drives. Although the observer is implemented in stationary reference frame, the design and theory analysis are made in the rotor-field oriented reference frame. Through coordinate transformation, the essence of the sliding- mode manifold and the theory foundation...
Medium-and high-voltage induction motors are widely used in industrial applications. Estimations of their operating currents are very much required for assessment of their steady-state performances. This paper presents a new analytical approach to estimate motor's slip-current curve from their technical catalog data. An accuracy of the proposed technique is validated by comparing the slip-current...
This paper deals with the stability analysis of the well-known Adaptive Full-Order Observer for the speed estimation of induction motor drive in a motoring and regenerating mode, under motor parameter mismatch. The influence of the identification errors of the stator and rotor resistance and magnetizing inductance on unstable operating points regions of the estimator with the modified adaptation algorithm...
In this article winding schemes and calculation methods for original energy efficient electric machines are introduced. They are intended for application in electrical equipment of autonomous systems. These machines winding conductors have a rectangular cross-section. Slot connection spots and overhang parts are reduced. This allows one to reduce copper intensity and the machine length and improve...
This paper deals with analysis of induction motor fed by non-harmonic voltage source. The losses are determined based on direct method for analysis of motor efficiency. The method is presented for fractional losses analysis with consideration harmonics generated by PMW. The introduced method earmarks the fundamental harmonic components of electrical magnitudes for comparison purposes of different...
This paper presents a dynamic induction motor (IM) model which incorporates all the power losses. The presented module is entirely built in Simulink to investigate the effect of varying the applied voltage and frequency on IM efficiency for different load applications. The model includes the power losses such as copper losses, core losses, stray load and mechanical. The accurate determination of induction...
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