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  • What's the Difference Between AC Induction, Permanent Magnet, and Servomotor Technologies? . Motors/Drives content from Machine Design

    Back-electromotive force (EMF) is voltage that opposes the current that causes it. In fact, back EMF arises in any electric motor when there is relative motion between the current-carrying armature (whether rotor or stator) and the external magnetic field. As the rotor .

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    9 Innovative Oil-Free Magnetic Bearing Compressor 2 Stages Centrifugal Type Magnetic Bearing No lubrication oil circuit DC Permanent Magnet Motor Variable Speed Drive Driven Electronics Integration 10 Innovative Oil-Free Magnetic Bearing Compressor

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  • Comparing Motor Technologies - Air Conditioning, Heating & Refrigeration News . Weekly newsmagazine of the HVACR contractor covering residential .

    Historically, the two predominant motor types have been permanent split capacitor (PSC) single-speed motors and 2.3 electronically commutated motors (ECMs) with variable-speed capability. This article looks at and compares the benefits of constant torque motor .

  • Water purification using magnetic assistance: A review

    2.2. Types of magnets The intensity of magnetisation of a separator can be enhanced by variation in magnet type used. There are three categories of separators based on magnet type: permanent magnet-based, electromagnet-based and superconducting magnet .

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  • Magnetic bearing - Wikipedia, the free encyclopedia

    Jesse Beams from the University of ia filed some of the earliest active magnetic bearing patents during World War II. The patents dealt with ultracentrifuges intended for the enrichment of isotopes of elements needed for the Manhattan Project. However .

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  • What is a Variable Frequency drive? - VFD, AC motor variable frequency drives - VFDs.in

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    By Steve Constantinides . Arnold Magnetic Technologies There are several commercially available permanent magnets. In sequence of invention they are: alnico, ferrite, SmCo (samarium cobalt), NdFeB (neodymium iron boron, Neo), and SmFeN (samarium iron .

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    ROCKING PISTON TYPE Rocking piston compressors are variations of reciprocating piston type compressors (Fig. 4). This type of compressor develops pressure through a reciprocating action of a one-piece connecting rod and piston. The piston head rocks as it .

  • Vapor-compression refrigeration - Wikipedia, the free encyclopedia

    Vapor-compression refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. It is .

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  • DC Inverter Air Conditioner Working Principles

    DC inverter air conditioner technical details include the use of IGBT transistors or Intelligent Power Module to drive the compressor. Filtering section is critical for compliance to EMC testsThe second section being PFC or power factor correction Being an active .

  • Centrifugal compressor - PetroWiki -

    Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. SPE disclaims any and all liability for your use of such . In a centrifugal compressor, energy is transferred from a set of rotating impeller blades to the .

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    Basic Electric Motors (part 2). Part of our Service Technician's and Engineer's Guide to Electricity for Refrigeration, Heating and Air Conditioning . SPLIT-PHASE MOTORS Two general classifications of split-phase motors are used in the industry. The .

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    Free-Piston-Engines Building a web site dedicated to Free Piston Engine technology. This website is specific to Free Piston Engines that use internal combustion technology. Research & Development Links to Technical papers, Thesis, U.S. Patents, Web .

  • Induction motor - Wikipedia, the free encyclopedia

    An asynchronous motor type of an induction motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor can therefore be .

  • Synchronous motor - Wikipedia, the free encyclopedia

    The operation of a synchronous motor is due to the interaction of the magnetic fields of the stator and the rotor. Its stator winding, which consists of a 3 phase winding, is provided with a 3 phase supply, and the rotor is provided with a DC supply. The 3 phase stator .

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  • Variable-frequency drive - Wikipedia, the free encyclopedia

    A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor .