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单词 generator
释义

generator


generator,

in electricity, machine used to change mechanical energy into electrical energy. It operates on the principle of electromagnetic inductioninduction,
in electricity and magnetism, common name for three distinct phenomena. Electromagnetic induction is the production of an electromotive force (emf) in a conductor as a result of a changing magnetic field about the conductor and is the most important of the
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, discovered (1831) by Michael Faraday. When a conductor passes through a magnetic field, a voltage is induced across the ends of the conductor. The generator is simply a mechanical arrangement for moving the conductor and leading the current produced by the voltage to an external circuit, where it actuates devices that require electricity. In the simplest form of generator the conductor is an open coil of wire rotating between the poles of a permanent magnet. During a single rotation, one side of the coil passes through the magnetic field first in one direction and then in the other, so that the induced current is alternating current (AC), moving first in one direction, then in the other. Each end of the coil is attached to a separate metal slip ring that rotates with the coil. Brushes that rest on the slip rings are attached to the external circuit. Thus the current flows from the coil to the slip rings, then through the brushes to the external circuit. In order to obtain direct current (DC), i.e., current that flows in only one direction, a commutator is used in place of slip rings. The commutator is a single slip ring split into left and right halves that are insulated from each other and are attached to opposite ends of the coil. It allows current to leave the generator through the brushes in only one direction. This current pulsates, going from no flow to maximum flow and back again to no flow. A practical DC generator, with many coils and with many segments in the commutator, gives a steadier current. There are also several magnets in a practical generator. In any generator, the whole assembly carrying the coils is called the armature, or rotor, while the stationary parts constitute the stator. Except in the case of the magneto, which uses permanent magnets, AC and DC generators use electromagnets. Field current for the electromagnets is most often DC from an external source. The term dynamo is often used for the DC generator; the generator in automotive applications is usually a dynamo. An AC generator is called an alternator. To ease various construction problems, alternators have a stationary armature and rotating electromagnets. Most alternators produce a polyphase AC, a complex type of current that provides a smoother power flow than does simple AC. By far the greatest amount of electricity for industrial and civilian use comes from large AC generators driven by steam turbines.

generator

[′jen·ə‚rād·ər] (computer science) A program that produces specific programs as directed by input parameters. Also known as generating routine. (electricity) A machine that converts mechanical energy into electrical energy; in its commonest form, a large number of conductors are mounted on an armature that is rotated in a magnetic field produced by field coils. Also known as dynamo; electric generator. (electronics) A vacuum-tube oscillator or any other nonrotating device that generates an alternating voltage at a desired frequency when energized with direct-current power or low-frequency alternating-current power. A circuit that generates a desired repetitive or nonrepetitive waveform, such as a pulse generator. (mathematics) One of the set of elements of an algebraic system such as a group, ring, or module which determine all other elements when all admissible operations are performed upon them. generatrix

Generator

A machine in which mechanical energy is converted to electrical energy. Generators are made in a wide range of sizes, from very small machines with a few watts of power output to very large central-station generators providing 1000 MW or more. All electrical generators utilize a magnetic field to produce an output voltage which drives the current to the load. The electric current and magnetic field also interact to produce a mechanical torque opposing the motion supplied by the prime mover. The mechanical power input is equal to the electric power output plus the electrical and mechanical losses.

Generators can be divided into two groups, alternating current (ac) and direct current (dc). Each group can be subdivided into machines that use permanent magnets to produce the magnetic field (PM machines) and those using field windings. A further subdivision relates to the type of prime mover and the generator speed. Large generators are often driven by steam or hydraulic turbines, by diesel engines, and sometimes by electric motors. Generator speeds vary from several thousand rotations per minute for steam turbines to very low speeds for hydraulic or wind turbines. See Diesel engine, Hydraulic turbine, Motor, Prime mover, Steam turbine, Wind power

The field structure of a generator establishes the magnetic flux needed for energy conversion. In small generators, permanent magnets can be used to provide the required magnetic field. In large machines, dc field windings are more economical and permit changes in the magnetic flux and output voltage. This allows control of the generated voltage, which is important in many applications. In dc generators the field structure must be stationary to permit a rotating mounting for the commutator and armature windings. However, since the field windings require low voltage and power and have only two lead wires, it is convenient to place the field on the rotating member in ac generators. See Electric power generation, Electric rotating machinery, Windings in electric machinery

generator

A machine that converts mechanical power into electric power.

generator

1. Physicsa. any device for converting mechanical energy into electrical energy by electromagnetic induction, esp a large one as in a power station b. a device for producing a voltage electrostatically c. any device that converts one form of energy into another form 2. an apparatus for producing a gas

generator

(1) Software that creates software. See application generator and macro generator.

(2) A device that creates electrical power or synchronization signals.

generator


generator

 [jen´ĕ-ra″tor] 1. something that produces or causes to exist.2. a machine that converts mechanical to electrical energy.pulse generator the power source for an pacemaker" >artificial pacemaker, usually powered by a long-lasting lithium battery and a microprocessor chip with appropriate electronic components to regulate the output of the battery; it supplies impulses to the implanted electrodes, either at a fixed rate or in a programmed pattern.

gen·er·a·tor

(jen'ĕr-ā-tŏr), An apparatus for conversion of chemical, mechanical, atomic, or other forms of energy into electricity. [generator, a begetter, producer]

gen·er·a·tor

(jen'ĕr-ā-tŏr) An apparatus for conversion of chemical, mechanical, atomic, or other forms of energy into electricity. [L. generator, a begetter, producer]

gen·er·a·tor

(jen'ĕr-ā-tŏr) An apparatus for conversion of chemical, or other forms of energy into electricity.

Patient discussion about generator

Q. Can cancer skip every other generation in your family? Can cancer be so hereditary as to skip every other generation in a family? On my dad's side of the family it seems like it does. Both my great grandmothers on my father's side had cancer (breast cancer and another type) and a great grandfather had cancer as well. My grandparents did not have cancer. My father ended up having cancer out of the three of my grandparents’ children. Me nor any of my cousins have had cancer. Is it possible any of our children will?A. If there is a BRCA mutation, it does not skip generations. A child of a person with a BRCA mutation has a 50/50 chance of having the mutation. Those who have the mutation can pass it on. Those who do not have the mutation cannot pass it on.

Q. What alternatives are there for DDD.De generative Disc Disease? I can't sit upright for long periods of time, at times the symptoms are worse and then days and weeks where I feel fine. When I lean into my right legit alleviates it a little but it is excruciating when I shift weight. I also have to sleep with a pillow between my legs and have to shift frequently.I have a lot of strength in my legs and back. But if I stuck in my stomach more and curve my like doing a crunch. the pain is fine.A. Degenerative disc disease can often be successfully treated without surgery. One or a combination of treatments such as Physical therapy, chiropractic manipulative therapy (CMT), osteopathic manipulation, anti-inflammatory medications such as nonsteroidal anti-inflammatory drugs, chiropractic treatments, Traction (orthopedics), or spinal injections often provide adequate relief of these troubling symptoms.
The option of surgery may be recommended if the conservative treatment options do not provide relief within 2 to 3 months. If leg or back pain limits normal activity, if there is weakness or numbness in the legs, if it is difficult to walk or stand, or if medication or physical therapy are ineffective, surgery may be necessary. You should dicucss this with an orthopedic surgeon.

Q. Hi I have pain in my knee since 3 years that I thought was generated by weight excess I've lost 28kg but the pain is still here, went to the doctor and he diagnosed a meniscus degenerated (direct translation from spanish, could be incorrect). He told me that there is nothing to do about that and that surgery won't help. My problem is that I love running and I can not do it anymore, everytime I try I start having pain in the back side of my knee and it last for days.I'd love to hear about alternativesRobertoA. Toberro, go to a GOOD health food store and get "Comfrey ointment". Rub this on your knee 2-3 times a day and see how you feel after a month of doing this. I have cured myself of carpal tunnel to avoid surgery doing this and it has also helped me with lower back pain! If you really want to feel better, stop eating any milk or cheese products and sugar! That all contributes to inflammation which arthritis is all about! Be well! :)

More discussions about generator
AcronymsSeeGNTR

generator


  • noun

Synonyms for generator

noun an apparatus that produces a vapor or gas

Related Words

  • apparatus
  • setup

noun engine that converts mechanical energy into electrical energy by electromagnetic induction

Related Words

  • alternator
  • brush
  • dynamo
  • engine
  • magneto
  • magnetoelectric machine
  • rotor
  • rotor coil
  • stator
  • stator coil
  • turbogenerator
  • aerogenerator
  • wind generator
  • windmill

noun someone who originates or causes or initiates something

Synonyms

  • author
  • source

Related Words

  • coiner
  • maker
  • shaper

noun an electronic device for producing a signal voltage

Related Words

  • electronic device
  • oscillator
  • pulse generator
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更新时间:2024/12/23 2:55:03