CN103746486A - Lath-type choking coil - Google Patents

Abstract

The invention relates to a lath-type choking coil for a motor. The lath-type choking coil is produced by winding an iron magnetic material lath with the surface being processed in insulation treatment and the thickness less than 1mm, the iron magnetic material lath is wound not in an end-to-end manner, the iron magnetic material lath is sleeved on two sections of winding coils which are exposed out of two ends of a stator groove, and an iron magnetic material pressure lath with the surface being processed in insulation treatment is laminated on the choking coil. The lath-type choking coil is sleeved on the winding coils, equivalently for nesting a closed iron core (like a transformer iron core) formed by arranging iron magnetic material laths on the coils to become an access of the varied magnetic flux at the sections of the coils, and the induced electromotive force (also named as self-induced electromotive force) is generated by the coil sections through the varied magnetic flux. The induced electromotive force always prevents the variation of no-load exciting current, so that the no-load exciting current is reduced through the induced electromotive force. Therefore, the lath-type choking coil can play a role in throttling the coil sections, and the no-load exciting current of the motor can be correspondently reduced. The effect of the motor which is provided with the lath-type choking coil is better, and the lath-type choking coil is suitable for being popularized for use.

Description

Strip type choking coil

Affiliated field: the present invention relates to a kind of motor choking coil, particularly a kind of strip type choking coil.

Background technology: " choking coil " of " 201120393739.5 " patent No. invention, be placed on the winding coil outside motor stator pilot trench, played the restraining effect to this line segment, reduced the no-load current of motor, accomplished energy-saving and cost-reducing.But, what " choking coil " adopted is that circle line is arranged winding making, etween the lines is a wire contact, contact-making surface minimum, leave gap, 20% of the sectional area applied in its cross-sectional area (core section amasss S) < length available and space, its energy-saving effect < can apply the energy-saving effect that sectional area should reach.

Summary of the invention: the object of this invention is to provide and a kind of do the used time the outside winding coil of motor stator pilot trench is played to restraining, the energy-saving effect of the choking coil of its energy-saving effect > circle wire-wound system, and reach the strip type choking coil that can apply the energy-saving effect that should reach in sectional area.The present invention realizes by following structure: the present invention is a kind of motor strip type choking coil, strip type choking coil adopts surface to be wound around and to make through the ferrimagnet lath of insulation processing, thickness <1mm, be not connected end to end, be placed on two sections of winding coils that expose stator slot two ends, on choking coil, laminate the ferrimagnet pressing article of surface through insulation processing.Strip type choking coil is not connected end to end, can prevent from producing eddy current in strip type choking coil.Although pressing article and choking coil overlap together, two bodies do not connect, because the surface of pressing article and choking coil all through insulation processing, makes its surface form insulating barrier, this insulating barrier has played partition effect, and this has also effectively prevented from producing eddy current in choking coil.Strip type choking coil is nested with on winding coil, be equivalent to put to coil iron core-closed (as the transformer core) that by ferrimagnet lath, rearranged, become the path of the variation magnetic flux of this section of coil, the magnetic flux changing, makes this coil segment produce induced electromotive force (also claiming self induction electromotive force).According to Lenz's law, induced electromotive force is to be produced by the variation of magnetic flux, and will oppose the variation of magnetic flux, namely will stop the variation of the electric current that produces magnetic flux.Specifically, in coil, induced electromotive force stops the variation of open-circuit excitation electric current always, and consequently induced electromotive force has reduced open-circuit excitation electric current.Can say, strip type choking coil can play restraining effect to coil segment, the corresponding open-circuit excitation electric current that reduces motor.Here, the size of induced electromotive force, has determined the number of open-circuit excitation electric current.Faraday's electromagnetic induction law: in closed circuit, the size of induced electromotive force is followed through the rate of change of the magnetic flux of this circuit and is directly proportional.Law representation formula is

$E=\frac{\mathrm{\&Delta;\&Phi;}}{\mathrm{\&Delta;t}}$

In formula, magnetic flux ΔΦ is directly proportional to induced electromotive force E, that is to say, when unit interval Δ t mono-timing, magnetic flux ΔΦ number, determined the size of induced electromotive force.The representation formula of magnetic flux phi is

$\mathrm{\&Phi;}=F\frac{\mathrm{\&mu;S}}{\mathrm{\&iota;}}$

In this formula, when magnetomotive force F mono-timing, the magnetic flux Φ in magnetic circuit is directly proportional to the long-pending S of core section.Can say, when the average length ι of magnetomotive force F, permeability μ, magnetic circuit is a timing, the size of the long-pending S of core section, determined magnetic flux Φ number.Therefore say, in one timing of other condition, the size of the long-pending S of core section, determined magnetic flux Φ number, determined the size of induced electromotive force simultaneously, corresponding also determined open-circuit excitation electric current number.Also can say, when the long-pending S of core section increases, can increase magnetic flux Φ, improve induced electromotive force E, reduce open-circuit excitation electric current I ₀.Strip type choking coil is to adopt ferrimagnet lath to arrange winding to make, and it is face contact that lath contacts with lath arrangement, and contact area maximum, does not have gap.So in certain length available and space, the cross-sectional area of strip type choking coil (core section amasss S) is than the cross-sectional area of the choking coil of round wire-wound system (core section amasss S) at least large 20%.Comprehensive elaboration above, can say, adopt the material of identical material to make, under equal conditions use, the energy-saving effect of strip type choking coil can improve more than 20% than the energy-saving effect of the choking coil of round wire-wound system, reached and can apply the energy-saving effect that sectional area should reach, through test, result is really like this.Generally speaking, motor is installed and used the better effects if of strip type choking coil, is applicable to promoting the use of.

Accompanying drawing explanation:

Fig. 1 schematic diagram of the present invention

Fig. 2 is the choking coil cross sectional representation of circle wire-wound system

Fig. 3 is cross sectional representation of the present invention

Embodiment:

The present invention is as shown in Figure 1 a kind of motor strip type choking coil, strip type choking coil (1) adopts surface to be wound around and to make through the ferrimagnet lath of insulation processing, thickness <1mm, be not connected end to end, be placed on the two sections of winding coils (3) that expose stator slot (5) two ends (4), on choking coil (1), laminate the ferrimagnet pressing article (2) of surface through insulation processing.

Claims (1)

1. the present invention is a kind of motor strip type choking coil, it is characterized in that: strip type choking coil adopts surface to be wound around and to make through the ferrimagnet lath of insulation processing, thickness <1mm, be not connected end to end, be placed on two sections of winding coils that expose stator slot two ends, on choking coil, laminate the ferrimagnet pressing article of surface through insulation processing.

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