Products/Services for Small Mechanical High Volt D.C. Generator

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Conduct Research

...in any one of the following three ways: (i) By induction – These are known as brushless alternators and are usually used in large generators.(ii) By permanent magnets – This is common in small alternator units.(iii) By using an exciter – An exciter is a small source of direct current (DC...

...of the output. used in the telecom industry to generate the ringing signal. voltage of a high quality ring generator is a sine wave with. for telephones. It is a DC/AC inverter that accepts a usual. low harmonic distortion. Other less expensive ring genera-. DC input voltage of 48V and produces an output AC...

As modern MOSFET transistors are developed with lower ON resistance and smaller packages, Electronic Speed Controls (ESC) follow. By using a microcontroller and a few small MOSFETs, high performance speed controls can be built with advanced features in small packages. This application note...

...for use by the inverter section). that external braking is required. In some cases, the degree of. This net production causes the bus voltage to rise. However, the. regenerative energy production is small, and readily absorbed at. rectification of the AC power to the DC bus is a one-way street. the DC...

...propor onal to the original mechanical input. The electronic damping is supplied by a. capacitor and placed across the sampling resistor. The capacitor and sampling resistor comprise a lead network which results. in a reduc on at high frequencies of the amplifier voltage necessary to drive...

...shown in Figure 1b to be used on residential 117VAC lines. A representative transient generator is to be used for testing as shown in Figure 1a. If the transient is applied to the existing circuit, the rectifier will receive high negative voltages, transmitted through the filter capacitor. The LC...

...the volt-. Powerline • September/October 2011. www.EGSA.org. 13. PARALLELING POWER SOURCES. Figure 1 provides examples of the line-to-neutral voltages of. Since the zero phase sequence impedance of the cables is. two dissimilarly pitched generators, G1 and G2. G1 generates a normally quite small...

...be determined from the sensi vity S from the following. from a cathode or emmiter follower where the resis ve. equa on: component is very high. The equivalent capacitance can. be shown to behave in a manner somewhat similar to the. So = S (Ca = 100) / Ca (Eq. 6). well known Miller effect...

...of signals caused by forces not directly applied about the axis of the applied. torque. A regulated 5 to 20 volt DC or AC RMS excitation is required and is applied between points A. and D of the Wheatstone Bridge. When torque is applied to the transducer structure the. Wheatstone Bridge becomes...

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  • North Lancashire Sub-Centre: Chairman's address. The electrical equipment of technical colleges
    A low supply voltage, such as 110 volts , is often considered desirable from the point of view... Higher , industrial voltages enable standard machines to be used, and the smaller cables are more easily secured. Standard d . c . motors are best loaded by some form of mechanical brake rather than by a calibrated generator , though the former may be difficult to adjust to steady values.
  • The development and operation of a 10-kW homopolar generator with mercury brushes
    ...generators series-connected could be designed to produce, say, 50kA at 7-0 volts with a brush... ...to be expected that constructional costs will be less than those for a higher -voltage commutator machine... From the operational standpoint maintenance of a fully developed system can be expected to be less because the continuous circulation of clean mercury replaces the periodic clean-up of d . c . commutators. The mercury system would nor- mally operate with quite a small temperature rise, and suitable running seals... ...the work, in particular Dr. S. G. Bauer in sponsoring the original venture, Mr. A. Frazer-Nash and Mr. A. R. Woods in the design of the experimental generator and auxiliaries, Mr. F... ...the manufacture and early mechanical trials, Dr. J. M...
  • Electric locomotives on the Valenciennes¿Thionville line
    For example, a single design of high -voltage regulator is used on both the Bo-Bo locomotives... ...is used for all the auxiliary equipment, the auxiliaries being driven by 380- volt 3-phase motors... ...the motors driving the various ventilating blowers will be reduced to a very small number of models. 5) MECHANICAL DETAILS OF Co-Co FREIGHT LOCO- MOTIVES WITH MOTOR GENERATORS The C0-Co locomotives are limited to a maximum speed of 37 m.p.h., and this has meant that the mechanical details of the suspension, guides and brake system... To overcome the problem of weight transfer, the system employed in the Alsthom Co-Co d . c . express locomotives has been adopted; in this, the superstructure is carried on each bogie by means of two rigid longitudinally-spaced supports—an arrangement which confers...
  • Generating plant for military equipment
    It ran at about 5 000 r.p.m. and drove a permanent-magnet 130-watt 40- volt alternator, the whole of the output being converted to 24 volts ( d . c .) by the metal rectifier mounted above it. ...pre-ignition chamber shut off from the cylinder by a valve to give high com- pression for... The mechanical construction did not lend itself to electric starting, and the introduction of A.T.S... 2) Electric immersion heater in a small tank connected in the water pipe from the cylinder block... 3) Starting electrically from the d.c. generator .
  • Inaugural address
    The number of motors in ships kept increasing (there are over 1 000 in a large carrier), and the replacement of the d . c . motor, with its commutator and brushgear, by the rugged squirrel-cage motor became an obvious and worth-while... The investigation showed that weight could be saved, even in a relatively small warship with a total of lOOOkW of installed generator capacity, by adopting a 440- volt 60c/s 3-phase a.c. system, with a proportionately greater saving in weight as... Although the possibility was considered, a voltage higher than 440 was not selected. This voltage was chosen because the lamp filaments would be more resistant to mechanical shock and vibration...
  • Discussion on ¿Crystal diodes¿ and ¿Crystal triodes¿
    ...which gives excellent performance in a ring modulator with only about 0-3- volt peak carrier-voltage. ...by Mr. Goldsmith is important only in the case of the rectifier with very high back-resistance. Our measurements, at a frequency of 45 Mc/s with only d . c . bias applied, show that at the origin the noise is purely thermal. In the back direction, the noise increases very rapidly, but at a small bias in the forward... When the temperature of the rectifier is considerably reduced, mechanical changes are likely to take place; e... ...double-frequency-changing method of measuring noise factor is better than the signal- generator method, while the...
  • The authors' replies to the discussions on ¿Crystal diodes¿ and ¿Crystal triodes¿
    ...which gives excellent performance in a ring modulator with only about 0-3- volt peak carrier-voltage. ...by Mr. Goldsmith is important only in the case of the rectifier with very high back-resistance. Our measurements, at a frequency of 45 Mc/s with only d . c . bias applied, show that at the origin the noise is purely thermal. In the back direction, the noise increases very rapidly, but at a small bias in the forward... When the temperature of the rectifier is considerably reduced, mechanical changes are likely to take place; e... ...double-frequency-changing method of measuring noise factor is better than the signal- generator method, while the...


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