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Numerical Analysis of the Electromagnetic Brake DOI:10.15199/48.2019.01.01

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Introduction Electromagnetic brakes (EMBs) are most commonly used in elevators, trains, lifting cranes, automotive industry, mining and wind power plants for braking or stopping the rotors of electrical machines. Generally speaking electromagnetic brakes are electrically activated but transmit torque mechanically [1]. The advantages of EMBs compared to conventional mechanical brakes are:  large braking torques,  stable braking at high temperatures,  fast response times (accurate engaging and clean releasing),  low noise and cheaper production. Because of these advantages the number of manufacturers and providers of EMBs on the market is increasing. According to the principle of operation we know mechanical, hydraulic, air, vacuum and EMBs. The EMBs can be further classified according to the principle of operation or according to the type of a power source (AC or DC). According to the principle of operation we know:  steel spring EMBs,  single or multiple disc EMBs,  hysteresis EMBs,  f particle EMBs and  eddy current EMBs. The principle of operation is similar for these types of EMBs, they differ only in the way of creating the braking torque [2]. This paper consequently presents a numerical analysis of a DC EMB with steel springs. It consists of a [3]:  magnetically nonlinear iron yoke, =[...]

Numerical modelling of linear generators DOI:10.15199/48.2019.01.02

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Linear electric machines are devices that directly produce or exploit linear movement. They have become commercially better known between years 1970 and 1980, when there were huge efforts to build a MAGLEV train for carrying passengers, which would be driven by linear synchronous motors. Linear machines are used in many other applications, as they have many good properties, such as high accelerations and decelerations, high thrust forces, high precision and reproducibility of the position [1]. Eric R. Laithwaite wrote that a linear electric machine is easiest to imagine as a rotary machine, of which stator and rotor are cut and unrolled in the plane [2]. Stator and rotor in a rotary electric machine become primary and secondary in a linear machine. Primary is the part of the machine which is supplied with electric current. Secondary is the part of the machine, with permanent magnet excitation system, a squirrel cage or magnetic saliency. All types of linear machines can have different topologies. In general there are two different geometry types; tubular and flat geometry type. Both geometries may have a long or short secondary or primary. Flat linear motors can be one-sided or double-sided [3]. Some most common applications where linear motors are used are sliding doors, swing doors, elevators, pneumatic hammers, electromagnetic pumps, electromagnetic flow meters, automation and robotics [4]. Lineat motor topologies The linear electric machine is represented as a rotary machine, which has been cut and unrolled in a plane. The rotor becomes the secondary; above it the unrolled stator represents the primary. Such a structur[...]

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