DOI:10.1049/jiee-1.1922.0101

出版商:IEE    

年代:1922

数据来源: IET

DOI:10.1049/jiee-1.1922.0102

出版商:IEE    

年代:1922

数据来源: IET

DOI:10.1049/jiee-1.1922.0103

出版商:IEE    

年代:1922

数据来源: IET

DOI:10.1049/jiee-1.1922.0104

出版商:IEE    

年代:1922

数据来源: IET

DOI:10.1049/jiee-1.1922.0105

出版商:IEE    

年代:1922

数据来源: IET

DOI:10.1049/jiee-1.1922.0106

出版商:IEE    

年代:1922

数据来源: IET

DOI:10.1049/jiee-1.1922.0107

出版商:IEE    

年代:1922

数据来源: IET

摘要:

(1) A suggestion is made that the high-pitched notes emitted by some induction motors are due to a side-pull arising from an unsymmetrical field which may be produced when certain numbers of rotor slots are used.(2) A simple case is first considered and the dissymmetry shown.(3) and (4) The forces produced are indicated and their effects considered.(5) The field is analysed and found to include pairs of components, such that in each pair the numbers of poles differ by two. The interferences between such pairs of fields produce the effects observed.(6) An elementary investigation is made which gives an expression for the frequency of the note produced.(7) Illustrative examples are considered.(8) The principle is extended.(9) A more general investigation is made.(10) A rule is developed for determining what numbers of rotor slots should be avoided.(11) Some experimental results are given.

DOI:10.1049/jiee-1.1922.0108

出版商:IEE    

年代:1922

数据来源: IET

摘要:

The paper describes a timing device consisting of an inductive resistance in a Wheatstone bridge. The theory of the device is given and an example of its application.

DOI:10.1049/jiee-1.1922.0109

出版商:IEE    

年代:1922

数据来源: IET

摘要:

The phases of costing discussed in the paper are those which will be of most interest and use to engineers in shops and offices.An example of the methods of calculating job costs is given, the proportions of the components of the factory costs of various engineering products are illustrated, and the use of mechanical appliances in various calculations is shown to give accuracy and save time in arriving at costs.The functions of a “work-in-progress” account are described in terms, translated from accountancy to their shop equivalents, showing the actual connection between such an account and the production of a department.The effect of inaccuracy, which may so easily occur in shop records, is traced through costs to show the delay and unreliability caused thereby; and the necessity of avoiding this inaccuracy is emphasized.The analysis of the costs of completed jobs gives information which is useful to those engaged in all branches of the industry, and a detailed example of such an analysis is given and described.As an example of the very many practical services given by a cost department, the relation between the rate of production and the proportion of factory overhead expenses in factory cost is cited.

DOI:10.1049/jiee-1.1922.0110

出版商:IEE    

年代:1922

数据来源: IET