Apparatus Section 3: Induction Machines: Single -phase Induction Motor

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Source Metadata

Field	Value
Source	Theoretical Elements of Electrical Engineering
Year	1915
Section ID	`theoretical-elements-electrical-engineering-section-109`
Location	lines 20428-21157
Status	candidate
Word Count	4570
Equation Candidates In Section	0
Figure Candidates In Section	0
Quote Candidates In Section	0

Opening Source Excerpt

in. Single -phase Induction Motor •1. INTRODUCTION 146. In the polyphase motor a number of secondary coils displaced in position from each other are acted upon by a num- ber of primary coils displaced in position and excited by e.m.fs. displaced in phase from each other by the same angle as the dis- placement of position of the coils. In the single-phase induction motor a system of secondary circuits is acted upon by one primary coil (or system of primary coils connected in series or in parallel) excited by a single alter- nating current. A number of secondary circuits displaced in position must be used so as to offer to the primary circuit a short-circuited sec- ondary in any position of the armature. If only one secondary coil is used, the motor is a synchronous

Source-Located Theme Snippets

Magnetism

... to the class of reaction machines. A single-phase induction motor will not start from rest, but when started in either direction will accelerate with increasing torque and approach synchronism. When running at or very near synchronism, the magnetic field of the single-phase induction motor is practically identical with that of a polyphase motor, that is, can be represented by the theory of the rotating field. Thus, in a turn wound under angle r to the primary winding of the single- ...

Impedance / reactance

... ng current of the main magnetic flux plus the current producing in the secondary the exciting current of the cross magnetic flux. In reality it is slightly less, especially in small motors, due to the drop of voltage in the self-inductive impedance and the drop of quadrature mag- netic flux below the impressed primary magnetic flux caused thereby. In the secondary at synchronism this secondary exciting current is a current of twice the primary frequency; at any other speed it is of a ...

Dielectricity / capacity

... agnetic flux producing the secondary currents, and in phase with the latter, that is, in time quadrature with the primary magnetic flux. Thus, if Fp = polarization due to the secondary currents, <i>a = auxiliary magnetic flux, 6 = phase displacement in time between 3>a and 3>p, and T = phase displacement in space between ^a and Fp, the torque is D = Fp$a sin T cos 6. In general the starting torque, apparent torque efficiency, etc., of the single-phase induction motor with any o ...

Radiation / light

... ly, in the polyphase motor running synchronously, that is, doing no work whatever, the secondary becomes current- less, and the primary current is the exciting current of the motor only. In the single-phase induction motor, even when running light, the secondary still carries the exciting current of the mag- netic flux in quadrature with the axis of the primary exciting coil. Since, this flux has essentially the same intensity as the flux in the direction of the axis of the primary ...

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