CN102427283A - Choking coil - Google Patents

Abstract

The invention relates to a choking coil for an electric motor. The choking coil is manufactured by winding magnetic material wires of which the surfaces are subjected to insulation treatment and Phi is less than 1mm, and sleeving the wound magnetic material wires onto two winding coils which are exposed out of both ends of a stator slot, wherein insulating layers are padded between the choking coil and the winding coils. The choking coil is arranged on the winding coils on the outer part of the stator slot, and the rated value of phase voltage of the stator windings and the leakage reactance of the stator windings are not influenced during operation, so that the choking coil has the effects of improving no-load phase electric potential and reducing no-load current and fulfills the aims of energy conservation and consumption reduction. The choking coil is arranged on the winding coils on the outer part of the stator slot, has an effect of reducing the no-load current and does not influence a stator, the leakage magnetic flux of the stator is not raised, and the electric motor torque cannot be reduced, so that the choking coil is suitable for assembly and use on the electric motor under all operating conditions. The choking coil has low investment, good energy saving effects, wide application range and high economic benefit and is easy to process and suitable for strong popularization.

Description

Choking coil

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

Background technology: the energy saving technical reconstruction of present motor mainly is the restraining transformation to winding coil section in the stator slot, as increases the magnetic slot-seal of each pattern, and does not have so far to the restraining technology of the outside winding coil section of stator slot.After using magnetic slot-seal instead in the stator slot, reduce the no-load current of motor, played energy-saving and cost-reducing effect.But the magnetic slot-seal of using instead has also produced side effect when reducing the motor no-load current, increased the leakage flux of stator gear tip clearance exactly, has reduced the starting torque of motor, and making can't operate as normal by the motor of big starting torque work.

Summary of the invention: the purpose of this invention is to provide and a kind ofly can play the restraining effect, and produce and both reduced no-load current and reach energy-saving and cost-reducing purpose, do not increase the gear tip clearance leakage flux again, do not influence the choking coil of motor torque to the outside winding coil section of stator slot.The present invention realizes through following structure: the present invention is that a kind of motor is used choking coil; Choking coil adopts the magnetic material silk of surface warp insulation processing, Φ＜1mm to twine and makes; Be placed on two sections winding coils that expose the stator slot two ends, be lined with insulating barrier between choking coil and the winding coil.Choking coil is nested with on winding coil, is equivalent to put closed iron core to coil, makes not controlled winding coil section originally, has received the restraining of choking coil.The result of its restraining is: the winding coil section that is nested with choking coil has produced self induction electromotive force.And this self induction electromotive force is identical with the induced electromotive force phase place of winding coil section in the stator slot, and in same winding coil, has formed an electromotive force series circuit with the induced electromotive force of winding coil section in the groove.According to electromotive force series circuit law, the total electromotive force in the series circuit equals in the series circuit, each electromotive force sum.That is to say that the self induction electromotive force that is nested with the winding coil section generation of choking coil has played the effect that strengthens the induced electromotive force of whole winding winding.And the induced electromotive force of the winding coil unloaded phase electromotive force E of stator winding just ₁₀In the motor designs formula

Unloaded phase electromotive force E ₁₀≈ U _{N Φ}-I ₀X _{δ 1}

It is no-load current $I_0\≈\frac{U_{\mathrm{N\Φ}}-E_{10}}{X_{\mathrm{\δ}1}}$

From above formula, can find out I ₀With E ₁₀Relevant.As stator winding phase voltage rated value U _{N Φ}With stator winding leakage reactance (mutually every) X _{δ 1}One regularly, unloaded phase electromotive force E ₁₀Bigger, no-load current I ₀More little.Because choking coil is seated on the outside winding coil section of stator slot; Be in operation, to stator winding phase voltage rated value and the not influence of stator winding leakage reactance, so the present invention is playing the time spent of doing that increases unloaded phase electromotive force; Reduce no-load current, reached energy-saving and cost-reducing purpose.Because choking coil is seated on the outside winding coil section of stator slot; Playing the time spent of doing that reduces no-load current,, neither increasing stator leakage flux not influence of stator; Can not reduce motor torque, so the present invention is adapted at installing and using on the motor of all operating modes yet.The present invention can accomplish that investment is little, and good energy-conserving effect is easy to processing, is widely used, and economic benefit is big, is fit to widely popularize.

Description of drawings:

Fig. 1 is a sketch map of the present invention

Embodiment:

The present invention as shown in Figure 1 is that a kind of motor is used choking coil; Choking coil (1) adopts the magnetic material silk of surface warp insulation processing, Φ＜1mm to twine and makes; Be placed on the two sections winding coils (3) that expose stator slot (5) two ends (4), be lined with insulating barrier (2) between choking coil (1) and the winding coil (3).

Claims (1)

1. the present invention is that a kind of motor is used choking coil; It is characterized in that: choking coil adopts the magnetic material silk of surface warp insulation processing, Φ＜1mm to twine and makes; Be placed on two sections winding coils that expose the stator slot two ends, be lined with insulating barrier between choking coil and the winding coil.