CN101398448B - Method for calculating turn number of each segment of transformer coil and device - Google Patents

Method for calculating turn number of each segment of transformer coil and device Download PDF

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CN101398448B
CN101398448B CN 200710151720 CN200710151720A CN101398448B CN 101398448 B CN101398448 B CN 101398448B CN 200710151720 CN200710151720 CN 200710151720 CN 200710151720 A CN200710151720 A CN 200710151720A CN 101398448 B CN101398448 B CN 101398448B
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section
turn
voltage
reference field
equations
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CN101398448A (en
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大卫·科克斯
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ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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ABB Research Ltd Switzerland
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Abstract

The invention relates to a method and a device used for calculating the number of windings of each segment of transformer coli winding which has a plurality of series connection segments. The number of windings of each segment is calculated by allocating each segment with predefined parameters relevant to customer requirements, and then linear equations are automatically generated and solved simultaneously.

Description

The method and apparatus that is used for every section number of turn of calculating transformer coil winding
Technical field
The present invention relates to a kind of method and apparatus that is used for every section number of turn of calculating transformer coil winding.
Background technology
As everyone knows, piezoelectric transformer is to be used for electric energy is converted to from a voltage potential commercial unit of another voltage potential.It is core and coil that voltage transformer has two primary clusterings.Core is by making such as steel or the such material of iron, and can have single stem stem or a plurality of stem stem according to the type of transformer.The coil of transformer is formed so that form the conductive material (being generally electric wire) of coil winding by around one or more stem stem that is wrapped in core.
Transformer is to make according to various client's standards, and design during transformer one of the most difficult task be the design coil.Under its simple form, the coil of transformer has single primary coil and single secondary coil.In the coil design of complexity, a plurality of windings can be arranged.
Each winding of transformer coil comprises in practice the section for a certain number of the circuit that is connected in series.The section of different numbers is connected in series to realize different voltages.Minimum in many cases two sections are connected in series, and all sections are connected in series to realize maximum voltage to realize minimum voltage.
One of problem when the design transformer is the number of turn of determining conductive wire for each winding segments, promptly so-called every section number of turn.Design of transformer person uses some mathematical methods to carry out this type of calculating that is assumed to be the basis with some simplification.For example, usually the hypothesis section has unified structure.These hypothesis have been simplified calculating but have been tended to introduce error.In addition, under the current state of this area, use different equations to calculate and the number of turn of different sections according to the design of transformer.These equations are hard coded into software, and when facing new design of transformer, should develop new equation and add new code to software.This requires recompility and linked code significantly, code is distributed to all users then, and this is a not only consuming time but also expensive process.
Therefore be desirable to provide a kind of improvement to the calculating of the Transformer Winding section number of turn with increase the solution of the total quality of design of transformer.
Summary of the invention
According to the present invention, provide a kind of be used for calculating comprise n the section of being connected in series (S 1, S 2..., S n) the every section number of turn (t of transformer coli winding 1, t 2..., t n) method.This method comprises:
-to described n section (S 1, S 2..., S n) in each section distribute the predetermined value (R of the corresponding every circle magnitude of voltage of representative i);
-to a reference field (S by one or more section in described n the section and selection from described n section n) be connected in series and each section combination (S of obtaining 1-S n, S 1-S N-1-S n, S 1-S 2-S N-1-S n...) and distribute the corresponding predetermined value (V of the voltage of representative in each described combination 1, V 2..., V n);
-will be scheduled to the number of turn (t n) distribute to described at least reference field (S n);
-simultaneous ground generates the system of equations of (n-1) individual linear equation of (n-1) individual unknown number, and wherein said (n-1) individual unknown number representative is used for removing described reference field (S n) outside the number of turn of all sections;
Find the solution the system of equations of described (n-1) individual linear equation-simultaneous, determine to remove described reference field (S thus n) outside the number of turn of all sections.
The present invention also comprise a kind of be used for calculating comprise n the section of being connected in series (S 1, S 2..., S n) the every section number of turn (t of transformer coli winding 1, t 2..., t n) system, this system comprises the computing equipment that wherein has program code, the configuration of this program code in order to:
-to described n section (S 1, S 2..., S n) in each section distribute the predetermined value (R of the corresponding every circle magnitude of voltage of representative i);
-to a reference field (S by one or more section in described n the section and selection from described n section itself n) be connected in series and each section combination (S of obtaining 1-S n, S 1-S N-1-S n, S 1-S 2-S N-1-S n...) and distribute the corresponding predetermined value (V of the voltage of representative in each described combination 1, V 2..., V n);
-will be scheduled to the number of turn (t n) distribute to described at least reference field (S n);
-simultaneous ground generates the system of equations of (n-1) individual linear equation of (n-1) individual unknown number, and wherein said unknown number representative is used for removing described reference field (S n) outside the number of turn of all sections;
Find the solution the system of equations of described (n-1) individual linear equation-simultaneous, determine to remove described reference field (S thus n) outside the number of turn of all sections.
A kind of be used for calculating comprise n the section of being connected in series (S 1, S 2..., S n) the every section number of turn (t of transformer coli winding 1, t 2..., t n) computer program, comprise the computer-readable medium that has computer usable program code on it, the configuration of this computer usable program code in order to:
-to described n section (S 1, S 2..., S n) in each section distribute the predetermined value (R of the corresponding every circle magnitude of voltage of representative i);
-to a reference field (S by one or more section in described n the section and selection from described n section itself n) be connected in series and each section combination (S of obtaining 1-S n, S 1-S N-1-S n, S 1-S 2-S N-1-S n...) and distribute the corresponding predetermined value (V of the voltage of representative in each described combination 1, V 2..., V n);
-will be scheduled to the number of turn (t n) distribute to described at least reference field (S n);
-simultaneous ground generates the system of equations of (n-1) individual linear equation of (n-1) individual unknown number, and wherein said unknown number representative is used for removing described reference field (S n) outside the number of turn of all sections;
Find the solution the system of equations of described (n-1) individual linear equation-simultaneous, determine to remove described reference field (S thus n) outside the number of turn of all sections.
Description of drawings
To understand feature of the present invention, aspect and advantage better with reference to following description, claims and accompanying drawing, in the accompanying drawings:
Fig. 1 is an exemplary process diagram of schematically representing the embodiment of the method that is used for every section number of turn of calculating transformer coil winding according to the present invention;
Fig. 2 illustrates the example of the assembly of three-phase power transformer;
Fig. 3 illustrates the example system that is used for every section number of turn of calculating transformer coil winding according to the present invention;
Fig. 4 be have six windings that are connected in series Transformer Winding schematically show figure.
Embodiment
Should be noted that open for clarity and brevity the present invention, accompanying drawing may may not be drawn in proportion, and some feature of the present invention may illustrate with some schematic form.
On behalf of the method according to this invention of block diagram, shown in Figure 1 its can be advantageously used in the number of turn of the Transformer Winding of the arbitrary in fact class piezoelectric transformer of calculating.
Fig. 2 illustrates only example of piezoelectric transformer, the i.e. three-phase power transformer of representing by whole label 1.Transformer 1 comprises the conventional laminated core that is formed by suitable magnetic material such as veining silicon steel or amorphous alloy.This core comprises the first winding stem stem 2, the second winding stem stem 3 and tertiary winding stem stem 4.This core also comprises yoke 5 and following yoke 6.First, second and tertiary winding stem stem 2,3,4 opposite end separately for example use suitable adhesive to be coupled to yoke 5 and following yoke 6 regularly.The primary and secondary winding is positioned at around the respective core post according to various configurations.For example in the example of Fig. 1, elementary winding 7 is positioned at around corresponding first, second and the tertiary winding stem stem 2,3,4.For each stem stem 2,3 or 4, secondary winding 8 and 9 is positioned at around the respective primary winding 7 similarly.Spacer bar 10 with several difference in functionalitys can be positioned at winding 7,8,9 difference on every side.For example, spacer bar 10 can be formed by insulating material, so as between winding turns, to be provided for cooling off, a certain space of support etc.They also can be formed so that form the part of the earthed system of winding by conductive material.In Fig. 1, do not illustrate and also will not describe the additional structure unit and the function detail of transformer 1 hereinafter, such as being electrically connected between its winding and other assembly such as power supply, load etc., because they are dispensable for scope of the present invention and understanding.
Each Transformer Winding, winding 7,8,9 as shown in Figure 2 is by hereinafter being expressed as (S 1, S 2..., S n) number be a plurality of sections compositions of n, these sections are the circuit that are connected in series.Each section is by (t hereinafter referred to as 1, t 2..., t n) the circle of a certain number form, these circles are made by electric conductor, are generally electric wire or cable.Section (the S that is connected in series 1, S 2..., S n) number, particularly these that are connected in series section in the number of turn (t of each section 1, t 2..., t n), determine one or more virtual voltage that transformer can produce.
In order to calculate various sections the number of turn, design of transformer person starts the method according to this invention.To from following description, understand as those skilled in the art, software algorithm based on the method according to this invention can be implemented in any suitable computing equipment or system, and can utilize as independent assembly, perhaps with any other Software tool interrelate ground or even integrally utilize mutually with any other Software tool, this other Software tool is such as being to be used to design electric equipment, transformer particularly, instrument.For example, the deviser can sign in in as shown in Figure 3 the computing equipment 11, and when instruction appears on the video interface 12, can import desired data by keyboard 13 (perhaps mouse or equivalent of the apparatus).This algorithm can be to have resided on the computer equipment 11, perhaps can be loaded as the disk of implementing various instructions by computer program by the deviser.
As shown in fig. 1, in step 100, the deviser is n section (S of winding 1, S 2..., S n) in each section distribute the predetermined value (R of the corresponding every circle magnitude of voltage of representative i).
According to the first embodiment of the present invention, two different mutually corresponding predetermined every circle magnitude of voltage (R Ia) and (R Ib) be assigned to a plurality of sections (S that number is n 1, S 2..., S n) in the correspondent section of at least two sections.All the other section (S 1, S 2..., S n) respectively be assigned can with (R Ia) or (R Ib) different or equal analog value (R i).
Alternatively, all n section (S 1, S 2..., S n) be assigned with identical every circle magnitude of voltage (R i).
The method according to this invention also comprises step 101, wherein corresponding scheduled voltage (V 1, V 2..., V n) be assigned to by one or more section in n the section and a reference field (S who among n section itself, selects n) be connected in series and each section combination S of obtaining 1-S n, S 1-S N-1-S n, S 1-S 2-S N-1-S nDeng.In practice, in this step 101, deviser's input value V 1, this value representative is being passed through section S 1With reference field S nExpectation voltage on the circuit that is connected in series and obtains.V 2Be the value that the deviser distributes, the representative of this value is by the section of being connected in series S 1, S N-1And S nAnd the expectation voltage on the circuit that obtains.V 3Be apportioning cost, this value representative is at the section S by considering to be connected in series 1, S 2, S N-1And S nAnd the voltage in the combination that obtains, or the like.
In step 102, the deviser will be scheduled to the number of turn (t n) distribute at least as a reference and select at least the section (S n).Distribute to reference field (S n) this predetermined number of turn (t n) provide as the number percent of the preposition number of turn, promptly as by above-mentioned section combination S 1-S n, S 1-S N-1-S n, S 1-S 2-S N-1-S nOne of and the number percent of the total number of turns that exists in one of circuit of forming.Preferably, distribute to reference field (S n) this predetermined number of turn (t n) as passing through the i.e. section S of two sections 1With reference field S nBe connected in series and the number percent of the total number of turns that exists in the circuit that forms provides.
Alternatively, distribute to reference field (S n) the number of turn (t n) can directly be preceding setting value.
Predetermined every circle magnitude of voltage (R i), distribute to reference field (S n) the predetermined number of turn (t n) and distribute to above-mentioned section combination S 1-S n, S 1-S N-1-S n, S 1-S 2-S N-1-S nDeng each magnitude of voltage (V 1, V 2..., V n) select based on customer requirement and/or based on deviser's practical experience by the deviser, and be easy to known to those skilled in the art.
Just as the skilled personnel can understand, in the method according to the invention, can realize abovementioned steps 100,101 and 102 with any order.For example, can organization instruction so that require the deviser magnitude of voltage V of input in each section combination earlier i, then with every circle magnitude of voltage (R i) distribute to each section etc.
After step 100,101 and 102, the method comprising the steps of 103, wherein for example generates the system of equations of (n-1) individual linear equation of (n-1) individual unknown number by the processing unit of computing equipment 11.Especially, (n-1) individual equation is that simultaneous ground generates.Should (n-1) individual unknown number representative be used for removing reference field (S n) number of turn of in addition all n sections.
Preferably, the system of equations of (n-1) individual linear equation of n unknown number comprises following equation:
t 1R 1＝V 1-t nR n
t 1R 1+t n-1R n-1＝V 2-t nR n
t 1R 1+t 2R 2+t n-1R n-1＝V 3-t nR n
t 1R 1+t 2R 2+t 3R 3+...+t n-1R n-1＝V n-t nR n
At last, in step 104, find the solution the system of equations of (n-1) individual linear equation simultaneous, determine to remove reference field (S thus n) the number of turn of each section in addition n section.For example, by the processing unit of computing equipment 11, calculate the number of turn by the algorithm that is used for different sections.
Preferably, in the method according to the invention, find the solution the system of equations of (n-1) individual simultaneous linear equations by augmented matrix and Gaussian elimination method.
Correspondingly, use augmented matrix and Gaussian elimination method to find the solution above-mentioned system of equations and obtain following matrix yojan (, only showing 3 voltages of use here) for asking simple and clear:
R 0 0 R R 0 R R R | V 1 - t n R V 2 - t n R V 3 - t n R ⇒ R 0 0 0 R 0 0 0 R | V 1 - t n R V 2 - V 1 V 3 - V 2 ⇒ 1 0 0 0 1 0 0 0 1 | V 1 - t n R R V 2 - V 1 R V 3 - V 2 R
If perhaps every circle magnitude of voltage (R of each section i) difference, then be following form:
R 1 0 0 R 1 R 2 0 R 1 R 2 R 3 | V 1 - t n R n V 2 - t n R n V 3 - t n R n
Above matrix will be handled according to the process shown in the arrow.
Hereinafter will provide and use method of the present invention to calculate two numeric example as the number of turn of the transformer coli winding that schematically shows among Fig. 4.
As shown in Figure 4, exemplary winding 20 comprises six section S 1, S 2, S 3, S 4, S 5, S 6If among each section of winding 20, have an interlude (break segment), this takes place in some practical applications, but in following example, do not take place, this interlude does not participate in circuit, therefore in calculating, is not considered or, will for producing the voltage of expecting, be useful because have only all the other sections to calculating not influence.
Above-mentioned six sections form following five circuit:
Circuit 1: by the section of being connected in series S 1And S 6And form;
Circuit 2: by the section of being connected in series S 1, S 5And S 6And form;
Circuit 3: by the section of being connected in series S 1, S 2, S 5And S 6And form;
Circuit 4: by the section of being connected in series S 1, S 2, S 4, S 5And S 6And form;
Circuit 5: by the section of being connected in series S 1, S 2, S 3, S 4, S 5And S 6And form.
All six sections are assigned identical every circle magnitude of voltage (R in this example i), R for example i=7.In addition, section S 6To be reference field, and the deviser distributes a number of turn of 50% that equals circuit 1 number of turn to its, this circuit 1 be promptly by linkage section S 1With section S 6And the circuit that forms.
Based on customer requirement, the expectation voltage in each section combination in above-mentioned five sections combination that the deviser distributes is respectively V 1=9000, V 2=9500, V 3=10000, V 4=10500 and V 5=11000.
Like this, can calculate number of turn S 6Because the voltage on circuit 1 is V 1=9000 and 50% circle at S 6In, so S 6To contribution voltage V 150%, equal 4500 volts.Divided by R=7, acquisition value 642.85 represents to be used for S with this value 6Accurate number of turn value t 6Obviously, because circle can only have integer, be 643 circles so calculated value rounds.This value t 6=643 can with generate with simultaneous the system of equations of five equations of finding the solution:
Equation 1:t 1X7=9000 643x7=4499
Equation 2:t 1X7+t 5X7=9500 643x7=4999
Equation 3:t 1X7+t 2X7+t 5X7=10000 643x7=5499
Equation 4:t 1X7+t 2X7+t 4X7+t 5X7=10500 643x7=5999
Equation 5:t 1X7+t 2X7+t 3X7+t 4X7+t 5X7=11000 643x7=6499
Obtain following result (equation 1) t by using augmented matrix and Gaussian elimination method to find the solution above-mentioned system of equations with coming simultaneous 1=642.7 (when rounding, equaling 643 circles); (equation 2) t 2=71.1, will round is 71 circles; (equation 3) t 3=71.6, will round is 72 circles; (equation 4) t 4=71 (rounding) circle; (equation 5) t 5=71.4 (round is 71) circle.
Therefore, winding 20 amounts to and has the 643+643+71+72+71+71=1571 circle.
Might check the calculating of being undertaken by the total number of turns that multiply by in the circuit will obtain one or more what magnitude of voltage practically to check:
Circuit 1:643+643=1286 circle.This numeral be multiply by 7 (every circle magnitudes of voltage) obtain 9002 volts;
Circuit 2:643+643+71=1357 circle.This numeral be multiply by 7 (every circle magnitudes of voltage) obtain 9499 volts;
Circuit 3:643+643+71+72=1429 circle.This numeral be multiply by 7 (every circle magnitudes of voltage) obtain 10003 volts;
Circuit 4:643+643+71+72+71=1500 circle.This numeral be multiply by 7 (every circle magnitudes of voltage) obtain 10500 volts;
Circuit 5:643+643+71+72+71+71=1571 circle.This numeral be multiply by 7 (every circle magnitudes of voltage) obtain 10997 volts.
Therefore according to above self-evident, the method according to this invention allows to calculate the virtual voltage of very approaching desirable expectation value.
To provide the section that is used to Transformer Winding 20 now and calculate second example of the number of turn, wherein every circle magnitude of voltage all is not identical for all Duan Eryan.For example, the deviser is to section S 1And S 6Distribute every circle magnitude of voltage R=7.For section S 2And S 5, R will equal 6.5.For section S 3And S 4, R is assigned as and equals 6.
In this example, the expectation voltage in each section combination in above-mentioned five sections combination that the deviser distributes is respectively V equally 1=9000, V 2=9500, V 3=10000, V 4=10500 and V 5=11000.Similarly, section S 6Be reference field, the deviser (promptly passes through a section S to its distribution and circuit 1 1With section S 6Connection and the circuit that forms) 50% number of turn that equates of the number of turn.
By with the same carrying out in precedent, can calculate number of turn t 6=643 (rounding) and have the system of equations of following five equations:
Equation 1:t 1X7=9000-643 * 7=4499
Equation 2:t 1X7+t 5X6.5=9500-643 * 7=4999
Equation 3:t 1X7+t 2X6.5+t 5X6.5=10000-643 * 7=5499
Equation 4:t 1X7+t 2X6.5+t 4X6+t 5X6.5=10500-643 * 7=5999
Equation 5:t 1X7+t 2X6.5+t 3X6+t 4X6+t 5X6.5=11000-643 * 7=6499
Obtain following result (equation 1) t by using augmented matrix and Gaussian elimination method to find the solution above-mentioned system of equations with coming simultaneous 1=642.7 (when rounding, equaling 643 circles); (equation 2) t 5=76.6, will round is 77 circles; (equation 3) t 2=76.5, will round is 77 circles; (equation 4) t 4=82.8, rounding is 83 circles; (equation 5) t 3=83.1, rounding is 83 circles.
In this case, winding 20 amounts to and has the 643+643+77+77+83+83=1606 circle.
Can check result of calculation as follows:
Circuit 1:643 * 7+643 * 7=9002 volt.
Circuit 2:643 * 7+643 * 7+77 * 6.5=9502.5 volt.
Circuit 3:643 * 7+643 * 7+77 * 6.5+77 * 6.5=10003 volt.
Circuit 4:643 * 7+643 * 7+77 * 6.5+77 * 6.5+83 * 6=10501 volt.
Circuit 5:643 * 7+643 * 7+77 * 6.5+77 * 6.5+83 * 6+83 * 6=10999 volt.
Equally in this case, this has verified the validity of actual computation value for expectation value.
According to above description, obviously the method according to this invention allows more general and flexible way when every section number of turn of calculating transformer winding, and allows also have reliable results between various sections when the parameter of section such as every circle magnitude of voltage change.Particularly, by using simultaneous equations, this method is the calculating vague generalization of the number of turn, therefore need not new equation is hard coded into software when the new design of exploitation, and then need not to recompilate and link software and do not require also that again distributing software is to the user again.
Just as the skilled person will appreciate, and as previously mentioned, the present invention may be embodied as or adopt the form of preceding method, computing equipment or system with the program code that is configured to realize aforesaid operations form, have be implemented on computing machine can with or computer-readable medium among the form of computer program of computer usable program code.This computing machine can with or computer-readable medium can be can comprise, store, transmit, propagate or transmit for instruction execution system, device or equipment uses or any medium of the program that combined command executive system, device or equipment use, and can for example be but be not limited to electricity, magnetic, light, electromagnetism, infrared ray or semiconductor system, device, equipment or propagation medium or or even be printed with paper or other suitable medium of program on it.More object lessons of computer-readable medium (enumerating of non exhaustive property) will comprise: pocket computer dish, hard disk, random-access memory (ram), ROM (read-only memory) (ROM), Erasable Programmable Read Only Memory EPROM (EPROM or flash memory), optical fiber, portable compact disc read-only memory (CD-ROM), light storage device, transmission medium are as supporting the transmission medium or the magnetic storage apparatus of the Internet or in-house network.Be used to realize the computer program code of operation of the present invention or instruct and to write with any suitable programming language, as long as its allows to realize the aforementioned techniques result.Program code can fully carried out on user's the computing equipment, partly carry out on the computing equipment the user, partly partly carrying out on the remote computer or fully carrying out on remote computer or server on the user's computer as the stand alone software bag.In one scheme of back, remote computer can be connected to user's computer by Local Area Network or wide area network (WAN), perhaps can be implemented to the connection (for example using the ISP to pass through the Internet) of outer computer.
Should be appreciated that the description to aforementioned one or more exemplary embodiment is intended to only illustrate rather than exhaustive the present invention.Those skilled in the art can carry out some interpolation, deletion and/or modification and not break away from spirit of the present invention or the scope of the present invention that limits as claims to one or more embodiment of open theme.

Claims (6)

1. one kind is used to calculate the section S that comprises that n is connected in series 1, S 2..., S nEvery section number of turn t of transformer coli winding 1, t 2..., t nMethod, this method comprises:
Be described n section S 1, S 2..., S nIn each section distribute the predetermined value R of the corresponding every circle magnitude of voltage of representative i
Be a reference field S by one or more section in described n the section and selection from described n section nBe connected in series and each section combination S of obtaining 1-S n, S 1-S N-1-S n, S 1-S 2-S N-1-S n... distribute the corresponding predetermined value V of the voltage of representative in each described combination 1, V 2..., V n
To be scheduled to number of turn t nDistribute to described at least reference field S n
Simultaneous ground generates the system of equations of n-1 linear equation of n-1 unknown number, and wherein said n-1 unknown number representative removes described reference field S nOutside the number of turn of all sections;
Find the solution the system of equations of a described n-1 linear equation simultaneous, determine to remove described reference field S thus nOutside the number of turn of all sections.
2. the method for claim 1 is wherein found the solution the system of equations of a described n-1 linear equation by augmented matrix and Gaussian elimination method.
3. the method for claim 1, wherein said n section S 1, S 2..., S nIn at least two sections be assigned with two mutually different corresponding predetermined every circle magnitude of voltage R i
4. the method for claim 1, wherein all described n section S 1, S 2..., S nBe assigned with identical every circle magnitude of voltage R i
5. the method for claim 1 is wherein distributed to described reference field S nDescribed predetermined number of turn t nPercentage according to the number of turn that exists in one of described section combination recently provides.
6. the method for claim 1, the system of equations of n-1 linear equation of a wherein said n unknown number comprises following equation:
t 1R 1＝V 1-t nR n
t 1R 1+t n-1R n-1＝V 2-t nR n
t 1R 1+t 2R 2+t n-1R n-1＝V 3-t nR n。
......
t 1R 1+t 2R 2+t 3R 3+...+t n-1R n-1＝V n-t nR n
CN 200710151720 2007-09-27 2007-09-27 Method for calculating turn number of each segment of transformer coil and device Expired - Fee Related CN101398448B (en)

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CN2201673Y (en) * 1993-12-02 1995-06-21 竺兆康 Coil number measuring instrument
US5500598A (en) * 1991-11-16 1996-03-19 Voltech Instruments Limited Apparatus for testing electrical components which have windings
EP0676779B1 (en) * 1994-02-28 1998-07-22 Motorola, Inc. Method for making a transformer

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5500598A (en) * 1991-11-16 1996-03-19 Voltech Instruments Limited Apparatus for testing electrical components which have windings
US5323436A (en) * 1991-11-18 1994-06-21 Samsung Electronics, Co., Ltd. Apparatus of and method for counting a number of revolutions of a servo motor
CN2132188Y (en) * 1992-08-14 1993-05-05 竺兆康 Measuring instrument for coil assembly
CN2201673Y (en) * 1993-12-02 1995-06-21 竺兆康 Coil number measuring instrument
EP0676779B1 (en) * 1994-02-28 1998-07-22 Motorola, Inc. Method for making a transformer

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