CN101033578B

CN101033578B - Vehicle seam speed control circuit

Info

Publication number: CN101033578B
Application number: CN2006100581857A
Authority: CN
Inventors: 江建辉
Original assignee: YONGHUIXING MOTOR INDUSTRY Co Ltd
Current assignee: YONGHUIXING MOTOR INDUSTRY Co Ltd
Priority date: 2006-03-10
Filing date: 2006-03-10
Publication date: 2012-02-22
Anticipated expiration: 2026-03-10
Also published as: CN101033578A

Abstract

This invnetion discloses a sewing speed control circuit used in servo motor controller of industrial sartoriuses including a first negative comparison circuit, a second negative comparison circuit and a RLC control volume check circuit, in which, said RLC circuit includes a variometer composed of an induction rod connected with the footplate of the sartorius and an induction coil, and the induction rod is made of magnetic-conduction material, when using, the primary control component of the controller generates a set of detection signals and sends it to the sewing speed control circuit, and the depth penetrating into the induction coil changes according to the pressure enforced to the footplate by a user to change the induction value of the test circuit, said square wave is converted into pulse wave width of diferent components to be sent back to the master control component to count the pulse wave width to get the action and components trying to be controlled at the present.

Description

Vehicle seam speed control circuit

Technical field

The present invention relates to a kind of vehicle seam speed control circuit, refer to that especially a kind of non-contact type coil induction and pulsewidth utilized measures means so that sewing speed is control effectively.

Background technology

The speed controlling of industrial sewing machines motor controller is to adopt voltage to detect control mode at present; This way converts the amount of stepping on before the sewing pedal into one group of aanalogvoltage that between 0～aV, changes earlier; Wherein, A is the fixed reference potential value, converts the aanalogvoltage of this variation into one group of value between between 0～N by analog/digital converter again, (N is by the parsing figure place decision of analog/digital converter); Through judging the size of this value, adjust the control of sewing speed and action.

And the assembly of the amount of stepping on has variable resistor and Hall (Hall) inductor before being widely used at present detecting; Yet these two kinds detect mode on use is implemented, have disappearance and the restriction that is described below at least:

One, control resolution is influenced by the parsing figure place of analog/digital converter: general analog/digital converter has only 8 units; Its number range that can represent is 0～255; That is can only mark off the precision on 256 rank; As to adopt the analog/digital converter of seniority top digit, then cost improves relatively.

Two, variable resistor (VR) is when reality is used; Can produce contact-type frictional, so precision is limited, the wearing and tearing of assembly are also comparatively severe; Directly have influence on its service life; Even adopt the variable resistor of height rub resistance, when its loss to a certain degree the time, also have loose contact and influence the situation of using accuracy and take place; Again because, Hall (Hall) inductor belongs to the special driving component of specification, easy precision influenced by ambient temperature, obtains and is difficult for and on the high side.

Summary of the invention

The problem that the present invention will solve provides a kind of vehicle seam speed control circuit, because it adopts contactless sensing mode, so does not receive the influence of frictional dissipation its service life, and cost is comparatively cheap, and control resolution is high.

In order to address the above problem, the technical scheme of vehicle seam speed control circuit of the present invention mainly comprises:

The first anti-phase comparison circuit, the second anti-phase comparison circuit and RLC controlled quentity controlled variable detecting circuit; Wherein, This first anti-phase comparison circuit and the second anti-phase comparison circuit are connected with motor controller master component on the Sewing machines and controlled by it; Has variometer in this RLC controlled quentity controlled variable detecting circuit; This variometer is made up of the inductive rod and the induction coil that are connected with the sewing machine foot pedal, and its inductance value stretches into the weight of induction coil along with the inductive rod that receives pedal control and changes.

By above-mentioned design; Inductive rod stretches into the inner depth amount of induction coil and changes because of the difference that the user exerts pressure to pedal; And make this circuit produce different inductance value; Become the pulse bandwidth of different components by the detection signal of master component input through this circuit conversion, send back to and carry out the pulse bandwidth counting in the master component and handle, get final product to such an extent that want action and the component controlled up till now.

Compared with prior art, the beneficial effect of vehicle seam speed control circuit of the present invention is:

1, with low cost: the present invention adopts the made inductive rod of coil with low cost and permeability magnetic material as sensing component; Both all non-special requirement assemblies are obtained easily, therefore; But compare with existing power transformation group, Hall subassembly, help the reduction of manufacturing cost.

2, long service life and do not have the restriction of frictional wear: the present invention with the made inductive rod of contactless coil and permeability magnetic material as sensing component; Stretch into the degree of coil according to inductive rod; Cause the magnetic capacity of coil to change; Can obtain the effect that controlled quentity controlled variable detects, reduce effectively and damage probability, increase the service life.

3, improve detection resolution: the present invention adopts the timer of building in the processor to count as pulsewidth, and the timer of building in general all has 16 units, can mark off the precision on 65536 rank, so can get higher control resolution.

Description of drawings

Fig. 1 is an action sketch map of the present invention;

Fig. 2 is a detailed circuit diagram of the present invention;

Fig. 3 A is that inductive rod stretches into the oscillogram of the inner amount of stretching into of induction coil for hour being produced;

Fig. 3 B is that inductive rod stretches into the oscillogram that is produced when the inner amount of stretching into of induction coil is maximum.

[primary clustering symbol description]

10:RLC controlled quentity controlled variable detecting circuit 11: induction coil

12: 21: the first anti-phase comparison circuits of inductive rod

22: the second anti-phase comparison circuits 30: master component

31: squarer 32: timer

The specific embodiment

Vehicle seam speed control circuit of the present invention is located in the industrial sewing machines servomotor controller; Because of imposing the different pressure of trampling to pedal, the user produces different inductance value; Thereby the pulse wave signal of output different in width; Further this pulse wave signal is carried out the pulsewidth counting again, can calculate the component of desire control.

At first, as shown in Figure 1, the present invention is the RLC controlled quentity controlled variable detecting circuit 10 through linking with the sewing machine foot pedal; With the exert pressure dynamics of perception user to pedal; Wherein, this RLC controlled quentity controlled variable detecting circuit 10 has with the different variometers that change its inductance value of pedal pressurized degree, and this variometer is made up of

induction coil

11 and 12 of inductive rod being incorporated into the sewing machine foot pedal; Wherein, This inductive rod 12 is made with permeability magnetic material, and can be line style or camber, according to the exert pressure dynamics difference of user to the sewing machine foot pedal; Change and make inductive rod 12 stretch into induction coil 11 inner depth amounts, make the inductance value of RLC controlled quentity controlled variable detecting circuit 10 also change thereupon; Its principle is: when the relative position change is arranged between inductive rod 12 and the induction coil 11; Can cause the magnetic flux in the induction coil 11 to change; Produce induced-current simultaneously; The variable quantity in former magnetic field can be resisted in the new magnetic field that this electric current produced, to stop inductive rod 12 and induction coil 11 relative motions.

The circuit structure part of relevant vehicle seam speed control circuit of the present invention; As shown in Figure 2, aforesaid RLC controlled quentity controlled variable detecting circuit 10 is the master component 30 formation loops through the motor controller (not shown) of establishing in the first anti-phase comparison circuit 21 and the second anti-phase comparison circuit 22 and the Sewing machines; Again,

This RLC controlled quentity controlled variable detecting circuit 10 is made up of resistance R 19, capacitor C B9 and variometer, and this variometer is made up of induction coil 11 and inductive rod 12 of being placed through in this induction coil 11; This inductive rod 12 is to be incorporated on the pedal of Sewing machines and to control the degree that it stretches into induction coil 11, and the inductance value of variometer stretches into the degree in the induction coil 11 along with inductive rod 12 and changes;

This first anti-phase comparison circuit 21 is located between the input of output and RLC controlled quentity controlled variable detecting circuit 10 of master component 30;

This second anti-phase comparison circuit 22 is located between the output of output and master component 30 of RLC controlled quentity controlled variable detecting circuit 10;

In present embodiment, this first anti-phase comparison circuit 21 and the second anti-phase comparison circuit 22 are made up of the interior LM324 chip of building four operational amplifiers;

This master component 30, it includes squarer 31 at least and gives the first anti-phase comparison circuit 21 in order to the output detection signal, and timer (Timer) 32 carries out the pulsewidth counting in order to the pulse wave signal to 22 inputs of the second anti-phase comparison circuit; Because master component 30 is basic modules of existing industrial sewing machines servomotor controller, and the main target of non-the present invention place, its detail circuits structure no longer further given unnecessary details.

Can find out concrete structure kenel of the present invention by above-mentioned explanation; As for its circuit operation mode and working waveform figure; See also shown in Fig. 3 A and Fig. 3 B; Wherein, Fig. 3 A is that inductive rod 12 stretches into the oscillogram of the inner amounts of stretching into of induction coil 11 for hour being produced, and Fig. 3 B is that inductive rod 12 stretches into the oscillogram that the inner amounts of stretching into of induction coil 11 are produced when maximum;

At first; When Sewing machines comes into operation; Give the first anti-phase comparison circuit 21 by master component 30 inner squarer 31 outputs one class frequency, fixing square wave detection signal of work period; In the present embodiment, the frequency of this square wave detection signal is that 500Hz and work period are 50%, like waveform (1);

After 21 pairs of these square-wave signals of the first anti-phase comparison circuit carry out the anti-phase processing; Send into the RLC controlled quentity controlled variable detecting circuit 10 of rear end; And the RLC controlled quentity controlled variable detecting circuit 10 of isolation rear end is in the moment negative voltage (shown in waveform (2)) of instantaneous (the transient state) of square-wave signal transition process generation; Avoid the negative voltage direct inverse to invasion and attack master component 30, and cause the damage at master component 30 inner I/O ports;

This square-wave signal is sent into the transient phenomenon (like waveform (3)) that generation is discharged and recharged behind the RLC controlled quentity controlled variable detecting circuit 10; At this moment; Can impose different pedal forces to pedal by the user; The inductive rod 12 that order and pedal link changes it and stretches into the depth degree in the induction coil 13; Make the inductance value of RLC controlled quentity controlled variable detecting circuit 10 also change, square-wave signal also changes in the time constant that discharges and recharges of instantaneous process thereupon.

Square-wave signal is sent in the second anti-phase comparison circuit 22 by RLC controlled quentity controlled variable detecting circuit 10 more subsequently; The second anti-phase comparison circuit 22 will add the accurate position of a direct current (like waveform (4)) at the square wave of instantaneous charge and discharge phenomena; That is the accurate position of the low-voltage of square wave by the accurate position of 0V clamp to this direct current, so that can correctly filter out needed negative voltage pulse bandwidth; After the second anti-phase comparison circuit 22 is done that anti-phase is handled and compared computing with 0V, obtain being originally negative voltage waveform (like waveform (6)) partly through the square wave behind the voltage clamp (like waveform (5));

Waveform after the second anti-phase comparison circuit 22 will be handled is sent master component 10 back to, and after master component 10 inner timers 32 calculated its pulse bandwidth, just can obtaining at that time, the user hoped to produce the different speed controlled quentity controlled variable through bestowing the pedal different pressures.

Can know by above-mentioned explanation; The present invention is through contactless coil-induced and pulsewidth counting mode; Can make the user that actions such as sewing speed and pressure foot lifting, tangent line are effectively controlled; Solve the problem of traditional assembly short, low detection resolution in service life effectively, and helped the reduction of circuit cost; This shows that the present invention has really possessed significant practicality and progressive, and meet the patent of invention important document, mention application in accordance with the law.

Claims

1. a vehicle seam speed control circuit is located in the industrial sewing machines servomotor controller, mainly comprises:

The first anti-phase comparison circuit; Its negative terminal input is located on the output of set master component in this motor controller; To receive fixed frequency and the fixing detection signal of being seen off by the squarer of master component of pulse bandwidth, this first anti-phase comparison circuit carries out sending into RLC controlled quentity controlled variable detecting circuit after anti-phase is handled to this detection signal;

The second anti-phase comparison circuit, its output is connected with the input of motor controller master component, to export the pulse wave signal to master component;

RLC controlled quentity controlled variable detecting circuit; Form by resistance, electric capacity and variometer; Its input is connected with the output of the first anti-phase comparison circuit; Its output is connected to the negative terminal input of the second anti-phase comparison circuit; To constitute the loop with the motor controller master component, this variometer is by induction coil and be set in the induction coil and with the sewing machine foot pedal inductive rod that links, processes with permeability magnetic material and formed again, and wherein detection signal is sent into the transient phenomenon that generation is discharged and recharged behind the RLC controlled quentity controlled variable detecting circuit; The inductive rod that this moment, the user linked different orders of the dynamics of exerting pressure of pedal and pedal changes it and stretches into the depth degree in the induction coil; Make the inductance value of RLC controlled quentity controlled variable detecting circuit change, detection signal also changes in the time constant that discharges and recharges of instantaneous process thereupon, and detection signal is sent in the second anti-phase comparison circuit by RLC controlled quentity controlled variable detecting circuit more subsequently; The second anti-phase comparison circuit will add the accurate position of direct current in the instantaneous detection signal that discharges and recharges; After the second anti-phase comparison circuit is done that anti-phase is handled and compared computing with 0V, obtain being originally the waveform of negative voltage part through the detection signal behind the voltage clamp, the pulse wave signal after the second anti-phase comparison circuit will be handled is sent master component back to.

2. vehicle seam speed control circuit as claimed in claim 1, this first/the second anti-phase comparison circuit is made up of the interior chip of building operational amplifier.