Jacek F Gieras

Bydgoszcz University of Science and Technology

A special transverse flux (TF) linear induction motor (LIM) with salient poles and nonferromagnetic secondary in shape of a boat has been discussed. The secondary is suspended, propelled and stabilized by the electromagnetic field. Equations of 2D distribution of the electromagnetic field and force equations have been derived. A small-scale prototy...

The paper deals with analytical method of design and prediction of performance characteristics for induction motors with solid steel rotor coated with copper layer. On the basis of the distribution of the 2D electromagnetic field, the equivalent impedance of the rotor have been derived. The edge effect and nonlinear magnetic permeability of solid s...

This paper discusses the approach to analytical calculation of the cogging torque in permanent-magnet (PM) brushless motors. Magnetic field energy in the air gap has been used to obtain the cogging torque equations. Two equations have been derived: with the PM circumferential width taken into account, and a simplified equation, i.e., without the ef...

The loss of outer rotor permanent magnet synchronous motor is mainly distributed in the stator core and windings, and the heat is difficult to dissipate. A commonly used cooling method is to inject cooling oil into the air gap, but it will increase the weight and friction loss of the motor, so the cooling oil will not fill the entire air gap, resul...

Compared with other electric machines, wound-field synchronous machines (WFSMs) have the advantage of having three control variables (stator $d$ - and $q$ -axis currents and rotor current). Determining the optimum combination of field and armature currents is necessary for ensuring the high-performance control of the WFSM. Two methods are usual...

Synchronous reluctance machine (SynRM) can be perceived as a special type of permanent magnet synchronous machine (PMSM), and shares similar control method, i.e. the sine-wave current drive with sinusoidal phase currents. In this paper, square-wave drive, which is employed for permanent magnet brushless (BLDC) motors, is employed for the SynRM, in...

An air-cooled double-rotor AFPM machine developed at the Electrical Machines Laboratory (EMLab) of Stellenbosch University in 2002, where: (a) rotor disc with surface-mounted PMs, (b) coreless stator with busbars, and (c) the assembled machine.

Latest achievements in three technologies of ultra high-speed ground transportation (UHSGT) have been presented: high-speed rail (steel wheel-on-rail); magnetic levitation (maglev) and Hyperloop. Selection of linear motors and major problems in construction of Hyperloop have been discussed. China is the world leader in UHSGT.

The actual trend in high speed electromechanical drives technology is to use permanent magnet (PM) brushless motors The following issues, which are essential in electromagnetic, mechanical and thermal design of high-speed PM brushless motors have been discussed: 1) main dimensions and sizing procedure, 2) mechanical requirements, 3) stator design g...

In saliency-based sensorless methods, the amplitude of the injected voltage cannot be reduced to levels below its specified value because of the reasonable signal required for the noise ratio. Increasing the injection signal amplitude increases not only the acoustic noise and high-frequency (HF) losses, but also the total harmonic distortion (THD)...

The paper presents the Incheon Airport Maglev Line (IAML) in South Korea connecting Incheon Airport with Yeongjong Island. The paper focuses on construction of elevated track and infrastructure, magnetic levitation and propulsion, cars of trainset, power consumption and operating costs.

Complete coverage of all aspects of electromagnetic, structural, and vibroacoustic noise in induction and permanent magnet brushless machines

The paper discusses the following problems: creativity, can creativity be learned, innovations, continuous and discontinuous improvements, life cycles (Kondratev waves) of new products, technologies and inventions, innovations in the U.S. and in the world, innovations in Poland, patents and breakthrough innovations of the last decades. The paper en...

The actual trend in high speed electromechanical drives technology is to use permanent magnet (PM) brushless motors, solid rotor induction motors or switched reluctance motors. The highest efficiency and highest power density is achieved with PM brushless motors. The following issues, which are essential in electromagnetic, mechanical and thermal d...

Performance characteristics of a shake flashlight. Abstract. The paper deals with an analysis and experimental tests on a shake flashlight. A shake flashlight has a built-in linear moving-magnet generator with stationary coil. Analytical equations for the induced EMF, current, voltage, electromagnetic force and power have been derived. A special s...

An attempt to localize and analyse the distribution of components of electric system on the crash site of the Tu-154M PLF101 aircraft on April 10, 2010 has been presented. All available sources of information as photographs, movies, articles, reports and blogs have been used. Only a few components of the electric system have been recorded in availa...

Performance characteristics of small two-phase permanent magnet (PM) brushless motors for computer case cooling fans have been investigated. Performance characteristics obtained from analytical calculations have been compared with the test results. A laboratory test equipment for fast measurements of performance characteristics has been built.

High speed motors that develop rotational speeds in excess of 5000 rpm are necessary for centrifugal and screw compressors, blowers, grinding machines, mixers, pumps, machine tools, textile machines, drills, handpieces, aerospace, flywheel energy storages, etc. The actual trend in high speed electromechanical drives technology is to use permanent m...

An electrical machine includes a stator having a main armature winding, an exciter field winding, and a transformer primary winding. A rotor is operatively connected to rotate relative to the stator, wherein the rotor includes an exciter armature winding operatively connected to the exciter armature winding for field excitation therebetween, a main...

A generator system includes a generator having a stationary portion and a rotating portion. The generator includes a permanent magnet based exciter with permanent magnets disposed on the stationary portion. A first channel includes a first main field winding and a first main field power converter disposed on a rotating portion. The first main field...

A method of converting power using a power semiconductor module includes conducting power to power semiconductor devices; converting the conducted power with the power semiconductor devices; conducting heat generated by the power conversion from the power semiconductor devices first through a conductive circuit layer, then through an insulating sub...

A new and useful electrical machine includes a stator including a stator winding and a primary transformer coil. A rotor is operatively connected to rotate relative to the stator, wherein the rotor includes a plurality of embedded permanent magnets. An excitation coil is wound on the rotor and is operatively connected to form a rotating transformer...

An electric power generating system includes a brushless wound field synchronous generator with n-number of power generating channels and n-number of bidirectional switches alternatively controlled to provide ac power at the output. Each power generating channel includes a control rotating transformer, a rotating power converter supplying power to...

A dual-generator assembly includes a first generator configured to generate a first current and a second generator configured to generate a second current modulated based on harmonic current in the first current.

The paper deals with a permanent magnet (PM) generator for novel architecture of wind turbines. The proposed wind turbine consists of a number of integrated lower-poer individual generators. The individual generators can be arranged in a rectangular matrix, hexagon or in a circle. The paper discusses sizing procedure for this type of generators, el...

The paper deals with a new architecture of wind turbine generators. The proposed wind turbine consists of a number of integrated smaller individual generators. The individual generators can be arranged in a rectangular matrix or in a circle. The paper discusses sizing procedure for this type of generators, electromagnetic calculations including the...

A direct current generating, management and distribution system includes a first armature winding, a first active rectifier having a first controller and coupled to the first armature winding, a first direct current bus coupled to the first active rectifier, a second armature winding, a second active rectifier having a second controller and coupled...

Application of linear electric motors to automation of manufacturing processes, gantry robots, machining processes, machining centers, additive manufacturing and laser scribing has been discussed. The paper focuses on replacement of ball lead screw mechanisms with linear electric motors, linear motor driven positioning stages, linear motor driven g...

statistics look as follows: 73 accidents and incidents with 3013 fatalities, 4 other occurrences (hull loss) without fatalities, 5 criminal occurrences (hull loss excluding hijackings) with 232 fatalities and 3 hijackings with 13 fatalities. Five fatal accidents resulted from criminal or military actions, several other from poor runway conditions,...

A permanent magnet generator comprises a stator core, a plurality of windings situated on the stator core, and a plurality of stress elements. The stress elements apply or relieve mechanical stress in response to control signals from a generator controller, thereby increasing or reducing voltage across the stator winding.

A permanent magnet generator comprises a stator core, a plurality of windings situated on the stator core, and a plurality of stress elements. The stress elements apply or relieve mechanical stress in response to control signals from a generator controller, thereby increasing or reducing voltage across the stator windings.

A power semiconductor module includes an insulating substrate with a conductive circuit layer attached to one side and a baseplate attached to the other side. A power semiconductor device is attached to the conductive circuit layer. The conductive circuit layer and the baseplate are formed of a material with a coefficient of thermal expansion less...

The fuel system, electric equipment of fuel tank and wiring, fuel flammability, mechanisms of electrical ignition and possibility of explosion of fuel-air mixture as a result of arcing and/or static electricity in fuel tanks of commercial aircraft has been analyzed. Approximate equations for minimum ignition energy (MIE) in fuel tanks have been der...

A machine has a housing that includes a plurality of stator coils to be positioned adjacent to a rotor. A switching network includes a plurality of transistors and diodes connected to the coils. A current source inverter is provided by a switching network, a pair of inductors positioned on power rails, and commutating capacitors. The current source...

Airborne high-speed synchronous generators rated in the power range of megawatts have been discussed. These generators are nowadays necessary for new aerospace missions, such as directed energy weapon (DEW) and airborne radar (AR). Requirements, ferromagnetic materials for magnetic circuits, electromagnetic design and cooling techniques for highspe...

A method for generating and controlling power by means of at least one controlled permanent magnet machine (PMM) with a permanent magnet (PM) rotor and a stator with a magnetic flux diverter circuit for controlling the output of the PMM, comprises the steps of: rotating the PM rotor at a velocity sufficient to develop a high frequency alternating c...

This is a collection of reports that consists of three parts. The author is a Professor of Power Electrical Engineering, so he focuses on the Tu-154M power electric system and all aspects of the air crash that relate to electrical equipment and wiring. Part I discusses the electric power system of the Tu-154M. After brief introduction to aircraft e...

An electromechanical actuator for controlling the position of an aircraft component has a linear actuator to be driven to position a component. A transverse flux motor drives the linear actuator to move in a linear direction and control the position of the component.

A method of forming a flux regulated machine includes winding stator windings into slots in an outer core. The outer core is formed to have a plurality of radially inwardly extending tooth pieces that are circumferentially spaced, and which define the slots. Further, control coils are wound around an inner core. Then, the inner core is inserted wit...

The paper discusses the electric power system of the Tu-154M aircraft. After brief introduction to aircraft power systems, the results of reverse design and analysis of the GT40PCh6 wound-field synchronous generator including short circuit have been presented. Electric power distribution and assignment of electric grids (channels) to respective air...

A dual source electric power generating system (EPGS) provides both a regulated AC output and a regulated DC output. The EPGS includes a rotating portion and a stationary portion. The stationary portion includes a plurality of windings (permanent magnet generator (PMG) armature windings, an exciter field winding, and high-voltage main generator arm...

A comparative analysis of hypothetical collision of Tu-154M with birch tree, full-scale dynamic crash test of Douglas DC-7 and full-scale dynamic crash test of Lockheed Constellation 1649 has been performed. The analysis pertains to the technical data of the Tu-154M, DC-7 and LC-1649 airliners, differences in their construction and conditions of co...

High-speed synchronous generators rated in the power range of megawatts have been discussed. These generators are nowadays necessary for new aerospace missions. Requirements, ferromagnetic materials, magnetic circuit, electromechanical design and cooling techniques for high-speed multimegawatt generators have been discussed. First prototypes (1 MW...

A brief review of permanent magnet (PM) synchronous generators with hybrid field excitation systems and output voltage regulation capabilities has been presented. Both series and parallel hybrid field excitation systems have been discussed. The review emphasizes the construction, advantages, drawbacks and basic characteristics of PM synchronous gen...

Linear motors and magnetic levitation have been an integral part of the graduate course “Electromechanical Energy Conversion” at the University of Technology and Life Sciences, Bydgoszcz, Poland, since 1978. The article presents small-scale laboratory prototypes of linear induction motors (LIMs), permanent magnet (PM) linear synchronous motor (LSM)...

The paper deals with analytical method of design and prediction of performance characteristics for induction motors with solid steel rotor coated with copper layer. On the basis of the distribution of the 2-D electromagnetic field, the equivalent impedance of the rotor has been derived. The edge effect and nonlinear magnetic permeability of solid s...

Linear synchronous motors. Linear induction motors. Variable reluctance motors. Stepping motors. Switched reluctance motors. Linear positioning stages.