Split Phase Research Articles

コンデンサ分相形ヒステリシス電動機の方形波電源による駆動

コンデンサ分相形ヒステリシス電動機の方形波電源による駆動

Decision Hysteresis Reduces Digital Pe

It is shown that the source statistics influence the form of the decision threshold in an optimum receiver. For a first-order Markov source, a simple suboptimum realization is a hysteresis loop. The performance improvement over the single threshold decision rule is modest but in some cases it is possible to cut the P e in half. One case where decision hysteresis performs best is in a modem that uses split phase or data scrambling to ensure that the transmitted signal tends to alternate. As a practical matter, it turns out that hysteresis can do more damage than good if the signal-to-noise ratio is variable.

Split sphere high pressure vessel and phase equilibrium relation in the system Mg 2SiO 4Fe 2SiO 4

In part 1 of this paper a split sphere multipiston assemblage is introduced with which it is possible to produce ultra high pressure and temperature for synthetic experiments. The second part of this paper reports a study on high pressure and temperature stability relation in Mg-rich mineral olivine, i.e. the most occurring mineral in the earth's mantle. Then, a phase diagram in the system Mg 2SiO 4 and Fe 2SiO 4 is shown together with some technical remarks.

PCM Data Transmission System Using Split Phase Code

The LAMPF control system specifies transmission of both data and timing signals between the control room and the local control points throughout the machine for data collection and equipment control information. A balanced system is used to reduce noise pickup. The transmitter receives a timing pulse train and the digital data in a "non return to zero" (NRZ) format. The two signals are combined to form a split phase code and transformer coupled to the transmission line. The receiver uses a minimum energy content circuit (integrator) preceding the decoder to reduce noise sensitivity. The number of timing pulses in the incoming pulse train is known as is the time duration of the transmission. This information is used to further reduce the probability of error.

The Multiplicity of the Mitotic Centers and the Time-Course of Their Duplication and Separation

In this study, the reproduction of the mitotic centers in the eggs of a sea urchin, Strongylocentrotus purpuratus and a sand dollar Dendraster excentricus has been studied by means of experimental designs that do not depend on the actual visualization of centrioles. The centers are defined in operational terms as potential poles. Blockage of mitosis by mercaptoethanol, it was found, inhibits the duplication of the centers, but does not inhibit the splitting and separation of centers that have already duplicated and thus potential poles could be realized as actual poles in multipolar divisions. At all times, the center is at least a duplex structure; that is, it contains two potential poles. The actual duplication process is the earliest event in a given mitotic cycle, taking place at very early interphase or in late telophase of the previous division. The splitting of the centers following duplication is a distinct process, dissociable from the duplication as such. Duplication and splitting normally occur at about the same time in the mitotic cycle, with a precession of the former. That is, as the two members of a pair of "old" centers split, each one gives rise to a new one, which remains associated with it until the next phase of splitting and duplication occurs. The results are consistent with what is termed a "generative" model of the self-reproduction of an intracellular body. According to this, the body does not immediately produce a full-fledged copy of itself, with simultaneous fission, but the primary duplication event involves only a part of the parent structure. This gives rise to a "germ" or "seed" which then grows to be equivalent to the parent body, and finally splits from it.

The Circle Diagrams at the Start of the Split Phase Indnction Motors and its Application to the Design of the Starting Winding

The Circle Diagrams at the Start of the Split Phase Indnction Motors and its Application to the Design of the Starting Winding

The Graphical Observation Method for the Characteristics of the Split Phase Induction Motors

The Graphical Observation Method for the Characteristics of the Split Phase Induction Motors

Selecting inherent overheat protectors

Approximately 40 per cent of all fractional horsepower motors of one-eighth horsepower to one horsepower split phase and capacitor types made in 1947 were built with inherent overheat protective devices. Field requirements make it desirable that a higher percentage of motors be equipped with inherent overheat protectors. To accomplish this, protector standards and standardized methods of applying protectors must be developed.

Some Theoretical Treatments of the Split Phase Type Single Phase lnduction Motor

Some Theoretical Treatments of the Split Phase Type Single Phase lnduction Motor

Analysis of Unsymmetrical Machines

By making use of suitably chosen components of current and voltage, the method of symmetrical components, which is so useful in the analysis of symmetrically wound polyphase a-c machines, can be extended readily to the analysis of unsymmetrical 2 phase induction machines, such as the capacitor or split phase motor in which the windings are not in space quadrature. Such extensions to this method, illustrated by a typical numerical example, are presented in this paper.

Analysis of unsymmetrical machines

By making use of suitably chosen components of current and voltage, the method of symmetrical components, which is so useful in the analysis of symmetrically wound polyphase a-c machines, can be extended readily to the analysis of unsymmetrical 2 phase induction machines, such as the capacitor or split phase motor in which the windings are not in space quadrature. Such extensions to this method, illustrated by a typical numerical example, are presented in this paper.

Split phase starting of 3 phase motors

Discussion and authors' closure of a paper by G. F. Tracy and W. E. Wyss published in the October 1935 issue, pages 1068–72, and presented for oral discussion at the general applications session of the Great Lakes District meeting, West Lafayette, Ind., October 24, 1935.

Capacitor Motors With Windings Not in Quadrature

Quite often the design of a split phase induction motor is such that the so-called quadrature winding is displaced at some angle other than 90 degrees from the main winding, in which event the motor behaves differently when run in opposite directions. It is the purpose of this paper to indicate a method by which the designer can predict the performance of such a motor. While the emphasis is placed upon the capacitor motor, the treatment is applicable also to motors of other types.

Split phase Starting of 3 Phase Motors

When 3 phase induction motors are to be operated from single phase lines, split phase starting is Frequently used. The optimum values of external resistance and reactance for split phase starting may be determined by the method of symmetrical components. In the present paper, equations For determining these values for each of the 2 commonly used split phase starting schemes are derived. The result of calculations based upon this method are shown to compare favorably with experimental data.

Split phase starting of 3 phase motors

When 3 phase induction motors are to be operated from single phase lines, split phase starting is frequently used. The optimum values of external resistance and reactance for split phase starting may be determined by the method of symmetrical components. In the present paper, equations for determining these values for each of the 2 commonly used split phase starting schemes are derived. The result of calculations based upon this method are shown to compare favorably with experimental data.

Mitogenetic Radiation of the Urea-Urease System

ALL fermentative processes hitherto investigated have been found to be accompanied by mitogenetic radiation ; but owing to the complexity of the substrata and the mechanism of splitting, it is not always possible to attribute radiation to a certain phase of fermentative splitting. Therefore it is of interest to study radiation in rather a simple system. We have chosen the system of urea-urease.

The Revolving Field Theory of the Capacitor Motor

The paper presents an accurate theory of the split phase motor, both as regards starting and running performance. The general equations for an unbalanced two-phase motor are first derived, and the results are then applied to the special case of the capacitor motor. Evidence of the validity of the theory is given in the form of curves, comparing test results with calculations. The principal factors affecting practical capacitor motor design are discussed, and finally the performance characteristics of the motor are compared with those of repulsion-start induction motors. It is concluded that the capacitor motor has important advantages, which will justify its extensive use. The complete derivation of the theory is given in an appendix.