CN102477652A

CN102477652A - Novel yarn feeder

Info

Publication number: CN102477652A
Application number: CN2010105543792A
Authority: CN
Inventors: 海勇
Original assignee: Dalian Chuangda Technology Trade Market Co Ltd
Current assignee: Dalian Chuangda Technology Trade Market Co Ltd
Priority date: 2010-11-23
Filing date: 2010-11-23
Publication date: 2012-05-30

Abstract

The invention relates to a novel yarn feeder, which comprises a dead block (TA) and a revolving arm (VO) pivotedly supported around the axis of the dead block, wherein the revolving arm is operationally connected to a permanent magnet type synchronous brush-less motor (M) so as to operationally wind yarn loops on the dead clock. The motor (M, M') comprises a stator (STA, STA') and a rotor, wherein the stator comprises a basically cylindrical hollow shell provided with at least three long and thin pole shoes (E1-E3, E1'- E3'), each pole shoe is respectively wound with magnet exciting coils (A, B, C, A', B', C'), the rotor comprises a magnetic piece with a circular section and alternated magnetic poles, and the magnetic piece is coaxially supported on a driving shaft (AM, AM ') and is close to the coils.

Description

A kind of novel yarn feeder

Technical field

The present invention relates to a kind of novel yarn feeder, relate in particular to the negative yarn feeder of the type of the motor that voltage-controlled or Current Control are housed.

Background technology

Existing as known, the weft feeder that is used for textile machine comprises a fixing reel, and motor-driven revoliving arm is reeled many yarn circles with formation weft yarn storage level on this reel.When in case loom needs, the unwinding from the reel of all yarn circles, an end break self-stop spare (breaking member) that remains on a value that is suitable for weaving processing through the tension force with yarn then yarn the most at last is fed to loom.

Motor by an electronic power unit drives transmission revoliving arm; This power supply unit comprises the bridge circuit by all electronic switches of control module control, and this control module is handled from many signals of the sensor of for example measuring the caused current signal of the driving weft yarn storage level, that be contained in sensor in the yarn feeder, yarn unwinding sensor, measurement motor and/or from the feedback signal of velocity sensor related with motor and/or position sensor etc.On the basis of these signals, the switch of the closed periodically electronic power of this control module unit is used to keep the weft yarn storage level on the reel constant basically with the control electromotor velocity.Above-mentioned control module basically can be through all circuit real-time workings, the function of the voltage/current that these circuit execution can be speed control loop or position control loop, nested control loop.

The negative yarn feeder of prior art uses stepper motor, perhaps, preferably uses brushless electric machine, and brushless electric machine comprises the cylindrical stator of a hollow, and this stator is provided with the field winding that is received within the thin groove pattern that cuts in the inner surface of stator.

But, as those skilled persons in this field are well-known, the said structure of realizing groove and winding be spend very much with require accurate machined, mainly be to be 40 to 70 millimeters reduced size because of the diameter that is used for the motor of yarn feeder.And this structure is difficult to, and installation receives the desired position sensor of speed/positional FEEDBACK CONTROL, for example Hall element like motor in stator.

Among the effort that overcomes about above-mentioned shortcoming that Hall element is installed, be provided with many small magnets on the outer surface of known flywheel at motor.Near the fixing Hall element of installing the flywheel when all magnet through the time detect them, thereby the generation rotor-position signal.

But; The shortcoming of said system is that it does not provide the electric position (electricposition) confirmed of rotor with respect to stator; Require the information of this position for starting motor gets into a required rotation direction, thereby require the control system of additional complicacy, this makes the Electronic Control structure complicated aspect software and hardware; The progress of starting sequence that also need assist was with some seconds of the starting of deferred telegram motivation.

In addition, magnet is installed on the flywheel of motor has increased the rotary inertia of flywheel, thereby has reduced gross efficiency.

In addition, in the passivity yarn feeder, use the brushless motor of the above-mentioned type to cause that driving torque receives the influence of what is called " pulsation " phenomenon.This down phenomenon limits the passband of control system, thereby influence the accuracy of yarn winding process, generation fault aspect the uniformity of fabric or WEB thereupon.As another shortcoming, torque pulsation causes that motor transmits less driving torque, thereby has increased current drain, finally causes the further decline of gross efficiency.

Summary of the invention

Therefore; A main purpose of the present invention provides a kind of novel yarn feeder of low cost of manufacture; Wherein accurately control position and the speed of revoliving arm and do not influence the gross efficiency of system, can also be with a required direction line-start motor, and in the Electronic Control structure, do not produce marked change.

Another object of the present invention provides a kind of novel yarn feeder, wherein knows that with respect to oneself yarn feeder reduces significantly or even elimination torque pulsation.

Have the characteristic described in the claim 1, have at the negative yarn feeder of described other the superior characteristic of other claim and realized simultaneously through following explanation will become more significantly above-mentioned purpose and additional objects and advantages.

Description of drawings

To narrate several preferred embodiment of the present invention with reference to accompanying drawing now, in the accompanying drawings:

Fig. 1 is total sketch map of a kind of novel yarn feeder that the present invention relates to;

Fig. 2 according to one first preferred embodiment of the present invention, be contained in the sectional elevation of the motor in the yarn feeder;

Fig. 3 according to one second preferred embodiment of the present invention, be contained in the stereogram of the motor in the yarn feeder;

Fig. 4 is the sectional elevation of stator of the motor of Fig. 3;

Fig. 5 be illustrate have different armature current values, as the curve map of the driving torque of the motor of a function of angle position;

Fig. 6 according to one the 3rd preferred embodiment of the present invention, be contained in the sectional elevation of the motor in the yarn feeder.

The specific embodiment

At first consult figure l, a general negative yarn feeder AN pulls out yarn F from a yarn tube RO, and with one clocklike speed yarn is fed to machine MF, for example loom, knitting machine, bobbin winder etc.Yarn feeder AN comprises a dead block, and the single-revolution arm VO that is driven by a motor M, be used for pulling out from yarn tube RO yarn reels a plurality of loop yarns (yarn loop) to form yarn deposit (weftreserve) RT at this dead block.When in case textile machinery MF requires, yarn F from the reel unwinding and through with a guide eye GA of reel coaxial line.

Motor M is the synchronous brushless motor of magneto, and this motor is driven by the bridge circuit of electronic power unit through electronic switch SP.Control module UC accepts from the one or more sensor Pl that measure the weft yarn storage level ... The signal SR1 of Pn ... SRn and/or from the pulse of yarn unwinding sensor SU and from the current signal I of motor and/or voltage signal V, from the feedback signal FB of the following position sensor related that will be described in detail and common external signal S with motor.On these bases, control module US produces a series of instruction C, and these instruction driving switch bridge circuits SP is used to keep weft yarn deposit RT constant basically with the rotation of control revoliving arm.

Consult Fig. 2 now; Motor M according to one first preferred embodiment of the present invention is provided with a stator STA; This stator comprises the cylindrical shell of a hollow, and this housing has radially nine outstanding elongated pole shoes inwardly, wherein three pole shoe El, E2, E3 each other each other equi-spaced apart open 120 ⁰With supporting magnet exciting coil A, B, C separately.The rotor of motor comprises a thin cylindrical shape magnet MC, this magnet through a supporting member SM coaxial line be bearing on the driving shaft AM.Cylindrical shape magnet MC is by radially polarization, and many arctic N and South Pole S alternately distribute each other.Each that does not have a coil to two pole shoes arranged side by side have separately, be arranged on wherein and be connected to Hall element Hl, H2, the H3 that is used for control module US delivering position signal.

According to one second preferred embodiment of the present invention; Shown in Fig. 3 and 4; That motor M. has is one columnar basically, the stator STA ' of hollow housing shape; Nine elongated pole shoes that this stator has a disk-shaped substrate BD and stretches out with a direction of the axis that is parallel to this substrate from this substrate, each pole shoe is a cylindrical lengthwise part.Three El ' of said all pole shoes, E2 ', E3 ' be equi-spaced apart 1200 and supporting magnet exciting coil A ', B ', C ' separately each other.Rotor comprises a driving shaft AM ', and this driving shaft has the dish type magnet D of a coaxial line that is keyed on it, and this magnet is had all arctic N alternately and all South Pole S by longitudinal polarization.Magnet D is set at the place ahead of coil and near its free end.Each that does not have a coil to two pole shoes arranged side by side have one separately, be arranged between the bipolar shoe and be connected to Hall element Hl', H2', H3' to control module delivering position signal.

For above-mentioned two structures; Magnetic part, promptly cylinder or dish can have four or five pairs of pole shoes (being five pairs in the drawings); The quantity that is four or five multiple depends on the designing requirement that is related to SPEED CONTROL OF MOTOR or Position Control, as the skilled person in this field is well-known.

The curve map of Fig. 5 show about the motor that receives a trapezoidal driving (trapezoidal driving), that have different armature supply (unit ampere), be the driving torque of a function of angle position.

As those skilled persons in this field will understand, these curves had a sinusoidal shape, and, surplus torque, the resistive torque of promptly when zero current, measuring is very little.

In one the 3rd embodiment of the present invention; As shown in Figure 6; The structure of motor is similar to second embodiment; But motor is two phases, have one be provided with eight pole shoes stator, four pole shoe El'b, E2'b, E3'b, E4'b equi-spaced apart one right angle and supporting magnet exciting coil A'b, B'b, C'b, D'b separately each other wherein.Disk D6 has five pairs of pole shoes.

For according to motor of the present invention, magnet exciting coil does not need as desired for conventional motors, directly to be wound on all pole shoes of stator.On the contrary, all coils of can reeling individually are installed in the stator then, are convenient to more install.

And because all Hall elements are arranged in all angular clearances between all coils, they do not require any additional installation housing, must have the possibility of making sized motor with low cost.

Narrate a preferred embodiment of the present invention at this, but in the scope of the principle of the invention, certainly made many variations.

Claims

1. novel yarn feeder, this yarn feeder comprises a dead block (TA) and single-revolution arm (VO), this revoliving arm (VO) supports and is operably connected to the synchronous brushless motor of a magneto (M) pivotly around the axis of this reel, with yarn coil on reel operationally; It is characterized in that said motor (M, M ') comprises a stator (STA, STA ') and a rotor; This stator comprises a columnar basically hollow housing, and this housing has at least three elongated pole shoes (El-E3, El'-E3 '); Be wound with magnet exciting coil (A, B, C on these pole shoes respectively; A ', B ', C'); This rotor comprises having a magnetic part circular section, that have all magnetic poles alternately, and this magnetic part is bearing in coaxially that driving shaft (AM, AM ') is gone up and near at coil.

2. a kind of novel yarn feeder as claimed in claim 1; It is characterized in that said magnetic part comprises by a thin cylinder (MC) the magnetic material manufacturing that is radially polarized, that have all magnetic poles alternately, said all pole shoe (El; E2, E3) radially outstanding inwardly from stator around the pivot center of rotor.

3. a kind of novel yarn feeder as claimed in claim 1; It is characterized in that; Said magnetic part comprises a thin dish (D) of being processed by a magnetic material; This magnetic material is longitudinally polarized and is had all magnetic poles that replace along its thickness direction, said all pole shoes (El '-E3 ', it is outstanding that El'b-E4'b) is parallel to the pivot center of rotor.