CN101847501A - Resolver - Google Patents
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- CN101847501A CN101847501A CN 201010140766 CN201010140766A CN101847501A CN 101847501 A CN101847501 A CN 101847501A CN 201010140766 CN201010140766 CN 201010140766 CN 201010140766 A CN201010140766 A CN 201010140766A CN 101847501 A CN101847501 A CN 101847501A
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Abstract
The invention provides a kind of small rotation transformer affected by noise that uses high-frequency signal.This resolver has: magnet exciting coil (14); Excitation signal output circuit (11,12) to magnet exciting coil (14) output excitation signal; Acceptance is by the search coil (16) in the magnetic field of magnet exciting coil (14) generation; And by to handle the output signal processing circuit (17) of the position that calculates search coil (16) by the detected detection signal of search coil (16), this resolver also has the noise signal injection circuit (18,19) of elimination, this elimination noise signal injection circuit (18,19) detects noise in advance from the output signal of excitation signal output circuit (11,12), and elimination noise signal identical with noise phase and that amplitude is opposite is outputed to output signal processing circuit (17).
Description
Technical field
The present invention relates to a kind of resolver of automobile that be used to detect with the anglec of rotation of the output shaft of motor.
Background technology
Hybrid vehicle, electric automobile use the brushless motor of high output, estimate from now on also can carry out high powerization.In order to control the brushless motor of hybrid vehicle, need correctly grasp the anglec of rotation of the output shaft of motor.If this is owing to want switch on switching controls then need correctly to grasp the position of rotation of rotor of each coil of stator.
Therefore, be desirably in and possess resolver in the motor and correctly carry out angle and detect.Be used in the resolver in the driving mechanism of automobile, except requiring environment resistant grade, because therefore the high revolution of driving mechanism also requires to carry out high precision int.And the same with other on-vehicle parts, resolver also requires to carry out cost degradation when requiring to carry out miniaturization.
Patent documentation 1: Japanese kokai publication hei 11-96361 communique
Summary of the invention
The problem that invention will solve
Yet there are the following problems for patent documentation 1.
Excitation signal is input to magnet exciting coil, to the output processing circuit output detection signal, still, in circuit, there is the electromagnetic induction of parasitic capacitance, electric wiring (harness) from magnetic test coil, the one-tenth of excitation signal is divided into noise and is loaded on the detection signal, thus the accuracy of detection variation.Particularly noise becomes problem under the situation of using high-frequency signal.
Therefore, the objective of the invention is to:,, be subjected to also small rotation transformer of noise effect even a kind of use high-frequency signal is provided in order to solve such problem.
The scheme that is used to deal with problems
In order to achieve the above object, resolver of the present invention has following structure.
(1) a kind of resolver has: magnet exciting coil; The excitation signal output circuit, it is to above-mentioned magnet exciting coil output excitation signal; Search coil (search-coil), it accepts the magnetic field by above-mentioned magnet exciting coil generation; And output signal processing circuit, it is to being handled by the detected detection signal of above-mentioned search coil, wherein, above-mentioned resolver also has noise canceller circuit, and this noise canceller circuit is used for the inversion signal of excitation signal or excitation signal is synthesized to detection signal.
(2) according to (1) described resolver, it is characterized in that above-mentioned noise canceller circuit has transformer.
(3) according to (2) described resolver, it is characterized in that, above-mentioned magnet exciting coil is two coils of sinusoidal wave coil and cosine wave coil, above-mentioned transformer have the sinusoidal wave high frequency corresponding with above-mentioned sinusoidal wave coil with core body, with the corresponding cosine wave high frequency of above-mentioned cosine wave coil with core body and accept simultaneously above-mentioned sinusoidal wave high frequency with the output of core body and above-mentioned cosine wave high frequency with the output high frequency of the output of core body three core bodys with core body.
(4) according to (1) described resolver, it is characterized in that above-mentioned noise canceller circuit has add circuit.
(5), it is characterized in that above-mentioned noise canceller circuit has above-mentioned add circuit is applied as the sine-wave components of the regulation of above-mentioned elimination noise signal and the switching circuit or the resistance of cosine wave composition according to (4) described resolver.
(6), it is characterized in that above-mentioned excitation signal is high-frequency signal to be carried out amplitude modulation and the signal that obtains according to (1) to (5) described any resolver.
The effect of invention
By having the resolver of the present invention of this feature, can access following effect, effect.
(1) a kind of resolver has: magnet exciting coil; The excitation signal output circuit, it is to above-mentioned magnet exciting coil output excitation signal; Search coil, it accepts the magnetic field by above-mentioned magnet exciting coil generation; And output signal processing circuit, it is by to handling the position that calculates above-mentioned search coil by the detected detection signal of above-mentioned search coil, because above-mentioned resolver also has following noise canceller circuit, promptly, in advance from the output signal of excitation signal output circuit, detect noise, and will elimination noise signal identical with this noise phase and that amplitude is opposite output to the noise canceller circuit of output signal processing circuit, therefore, even because of parasitic capacitance, electromagnetic induction of electric wiring etc. and produce the noise that causes by excitation signal, also noise can be from output signal, removed, thereby accuracy of detection can be improved.
(2) in addition,, therefore, do not need unnecessary computing circuit, just can remove noise easily because the resolver described in (1) is characterised in that above-mentioned noise canceller circuit has transformer.
(3) in addition, because the resolver described in (2) is characterised in that, above-mentioned magnet exciting coil is two coils of sinusoidal wave coil and cosine wave coil, above-mentioned transformer has the sinusoidal wave high frequency core body corresponding with above-mentioned sinusoidal wave coil, the cosine wave high frequency corresponding with above-mentioned cosine wave coil with core body and accept simultaneously above-mentioned sinusoidal wave high frequency with the output of core body and above-mentioned cosine wave high frequency with the output high frequency of the output of core body three core bodys with core body, therefore, core body is less to get final product, can reduce the minimizing departmental cost, and collaborate to come and can not make the reverse inflow of noise.That is, if each core body is set independently, then when the output line that connects from each core body, though there is the possibility that receives noise from other core bodys, but, as present embodiment, be made as the danger that can avoid receiving noise by core body with outlet side.
Because resolver described in (4) or (5) and the resolver described in (1) are characterised in that, above-mentioned noise canceller circuit has add circuit and above-mentioned add circuit is applied as the sine-wave components of the regulation of above-mentioned elimination noise signal and the switching circuit or the resistance of cosine wave composition, therefore, in the resolver of reality, accurately select the signal opposite by the noise contribution of measuring circuit with measured noise contribution phase place, therefore, noise contribution can be removed accurately, accuracy of detection can be improved.
(6) in addition, because (1) to (5) described any resolver is characterised in that, above-mentioned excitation signal is high-frequency signal to be carried out amplitude modulation and the signal that obtains, therefore, even because of high frequency produces more noise, also can accurately remove these noises, thereby can improve accuracy of detection.
Description of drawings
Fig. 1 is the block diagram of the structure of the resolver in the expression embodiments of the present invention.
Fig. 2 is the figure of expression ideal line and measurement data.
Fig. 3 is the figure of the composition of expression noise waveform.
Fig. 4 is the figure that the composition of noise signal is eliminated in expression.
Fig. 5 is the figure of elimination noise signal injection circuit of the transformer type of expression first embodiment.
Fig. 6 is the figure of the elimination noise signal injection circuit that adds French of expression second embodiment.
Fig. 7 is the figure of the structure of expression add circuit.
Fig. 8 is the figure of expression as the structure of the add circuit of the variation of second embodiment.
Fig. 9 is the figure of the switch motion of explanation add circuit.
Description of reference numerals
11,12: output circuit; 13: the resolver main body; 14: sinusoidal wave coil; 15: the cosine wave coil; 16: search coil; 17: output signal processing circuit; 18,19: eliminate the noise signal injection circuit; 23,24,29: the high frequency core body; 45: add circuit; 46,47,48,49: switch; 54: operational amplifier.
Embodiment
Next, with reference to accompanying drawing the first embodiment of the present invention is described.
At first, use Fig. 1 that the structure of first execution mode of having realized resolver of the present invention is described.The resolver of present embodiment is two-phase excitation, single-phase detection mode.Resolver main body 13 has sinusoidal wave coil 14, cosine wave coil 15 and search coil 16.Sinusoidal wave coil 14 is connected with the output circuit 11 of the excitation signal that is used for sine wave output.Cosine wave coil 15 is connected with the output circuit 12 of the excitation signal that is used to export cosine wave.Search coil 16 is connected with output signal processing circuit 17.
In addition, output circuit 11 directly is connected with output signal processing circuit 17 by eliminating noise signal injection circuit 18.Output circuit 12 directly is connected with output signal processing circuit 17 by eliminating noise signal injection circuit 19.
Next, describe eliminating noise signal injection circuit 18,19.
At first, the measurement to noise describes.Elimination noise signal injection circuit 18,19 at Fig. 1 is under the not-connected status, measures noise from the output signal from search coil 16 that is input to output signal processing circuit 17.Fig. 2 shows measurement result.The longitudinal axis is the transducer output angle (output of output signal processing circuit 17) of resolver, and transverse axis is actual electrical angle.If there is not noise fully, data are expressed as ideal line T1.But, in fact, because because of the parasitic capacitance of circuit, the noises such as electromagnetic induction of electric wiring are loaded on the data, therefore, measurement data becomes the measurement data T2 shown in solid line.The differential representation noise of ideal line T1 and measurement data T2.
Fig. 3 shows the noise waveform S3 as noise waveform one example.Can think that noise waveform S3 is the synthetic waveform of sinusoidal wave S1 and cosine wave S2.
Fig. 4 shows by eliminating the elimination noise signal that noise signal injection circuit 18,19 injects.
When the peak value of noise waveform is present in 0～pi/2 interval, because the synthetic noise that becomes of the composition (SIN) of sinusoidal wave excitation signal and the composition (COS) of cosine wave excitation signal, therefore, in order to offset noise, as long as (SIN) the anti-phase composition with the cosine wave excitation signal (COS) is used as eliminating noise signal to the anti-phase composition of the sinusoidal wave excitation signal of injection.
When the peak value of noise waveform is present in pi/2～π interval, because the composition (SIN) of sinusoidal wave excitation signal and anti-phase composition (the synthetic noise that becomes COS) of cosine wave excitation signal, therefore, in order to offset noise, as long as (SIN) composition (COS) with the cosine wave excitation signal is used as eliminating noise signal to the anti-phase composition of the sinusoidal wave excitation signal of injection.
When the peak value of noise waveform is present in π～3 pi/2s interval, because the anti-phase composition of sinusoidal wave excitation signal (SIN) and anti-phase composition (the synthetic noise that becomes COS) of cosine wave excitation signal, therefore, in order to offset noise, as long as the composition (SIN) of the sinusoidal wave excitation signal of injection and the composition (COS) of cosine wave excitation signal are used as eliminating noise signal.
When the peak value of noise waveform is present in 3 pi/2s～2 π interval, because the anti-phase composition of sinusoidal wave excitation signal (SIN) and the synthetic noise that becomes of the composition (COS) of cosine wave excitation signal, therefore, in order to offset noise, as long as the composition (SIN) of the sinusoidal wave excitation signal of injection and the anti-phase composition of cosine wave excitation signal (COS) are used as eliminating noise signal.
For example, shown in the example of Fig. 3, in the interval of 0～pi/2, there is under the situation of peak value waveform the waveform that noise signal obtains for synthetic " SIN " and " COS ".In this case, the waveform that injects phase place opposite " SIN " and " COS " is as eliminating noise signal, and thus, noise signal and elimination noise signal are cancelled out each other, and can reduce noise.
Next, the concrete example of the above-mentioned elimination noise signal of actual generation is described.
Fig. 5 illustrates the circuit that uses transformer to realize eliminating noise signal injection circuit 18,19.
Be wound with connecting line 21 at the high frequency of ferrite system with a side of core body 23, this connecting line 21 connects sinusoidal wave coil 14 and output circuits 11.Be wound with an end of connecting line 25 at high frequency with the opposing party of core body 23 (for example, in opposite directions position on diametric(al)), the other end of connecting line 25 is wound on high frequency with on the side of core body 29.On connecting line 25, be connected with variable resistor 26.
Similarly, the high frequency of ferrite system is wound with connecting line 22 with a side of core body 24, and this connecting line 22 connects cosine wave coil 15 and output circuit 12.Be wound with an end of connecting line 27 with the opposing party of core body 24 (for example, on diametric(al) in opposite directions position) at high frequency.The other end of connecting line 27 is wound on high frequency with on the side of core body 29.On connecting line 27, be connected with variable resistor 28.
In addition, high frequency is wound with a side's of a pair of output line 30 line with the opposing party of core body 29.Output line 30 is the lines that connect search coil 16 and output signal processing circuit 17, and in its way, a side of output line is wound onto high frequency with on the opposing party of core body 29.
Constitute elimination noise signal injection circuit 18,19 by high frequency with core body 23,24,29, connecting line 21,22,25,27, variable resistor 26,28 and output line 30.
The characteristic of eliminating noise signal injection circuit 18,19 is by determining with the resistance value of the number of turn (coiling number of times), coiling direction and the variable resistor 26,28 of relative each connecting line 21,22,25,27 of core body 23,24,29 and output line 30 with high frequency.Promptly, according to the phase place and the size of noise, pre-determine their value, constitute by the number of turn, coiling direction, the resistance value of determining and eliminate noise signal injection circuit 18,19.
And,, can make it become stronger antinoise structure by each connecting line 21,22,25,27 is made into twisted-pair feeder or shielding conductor.
As described above in detail, according to the resolver of first embodiment, this resolver has: magnet exciting coil 14,15; Excitation signal output circuit 11,12, it is to excitation signal 14,15 output excitation signals; Search coil 16, it accepts the magnetic field by magnet exciting coil 14,15 generations; And output signal processing circuit 17, it is to handling the position that calculates search coil 16 by search coil 16 detected detection signals, this resolver also has the noise signal of elimination injection circuit 18,19, therefore, even because of parasitic capacitance, electromagnetic induction of electric wiring etc. and producing and the synchronous noise of excitation signal, also can from output signal, remove noise, therefore, can improve accuracy of detection, wherein, this eliminates noise signal injection circuit 18,19 in order to remove the noise that is comprised by in the search coil 16 detected detection signals, uses excitation signal to be synthesized in the detection signal with the anti-phase elimination noise signal of the noise that is generated.
In addition, elimination noise signal injection circuit 18,19 has the high frequency core body 23,24,29 as transformer, therefore, does not need unnecessary computing circuit, just can remove noise easily.
Particularly, owing to above-mentioned resolver is characterised in that from the excitation signal of excitation signal output circuit 11,12 outputs be that high-frequency signal is carried out the signal that amplitude modulation obtains, therefore, even also can correctly remove these noises because of high frequency produces more noise, can improve accuracy of detection.
Next, the second embodiment of the present invention is described.The difference of second embodiment and first embodiment is to have carried out the structure of specializing to eliminating noise signal injection circuit 18,19, therefore, uses Fig. 6 to describe around this point.
Resolver main body 13 has sinusoidal wave coil 14, cosine wave coil 15 and search coil 16.Be used for the amplifying circuit 42 of waveform circuit 41 by having the inversion waveforms function of the output circuit of sine wave output, be connected with sinusoidal wave coil 14.The connecting line that connects waveform circuit 41 and amplifying circuit 42 is by variable resistor 56 ground connection.The connecting line that connects amplifying circuit 42 and sinusoidal wave coil 14 is by variable resistor 57 ground connection.
Be used to export the amplifying circuit 44 of waveform circuit 43 by having the inversion waveforms function of the output circuit of cosine wave, be connected with cosine wave coil 15.The connecting line that connects waveform circuit 43 and amplifying circuit 44 is by variable resistor 58 ground connection.The connecting line that connects amplifying circuit 44 and cosine wave coil 15 is by variable resistor 59 ground connection.
The movable terminal of variable resistor 56,57,58,59 is connected with add circuit 45.Fig. 7 shows the concrete structure of add circuit 45.In a second embodiment, add circuit 45 has realized eliminating the function of noise signal injection circuit 18,19.
The movable terminal of variable resistor 57 is connected with negative input end of operational amplifier 54 with resistance 50 by switch 46.Similarly, the movable terminal of variable resistor 56 is connected with negative input end of operational amplifier 54 with resistance 51 by switch 47.Similarly, the movable terminal of variable resistor 59 is connected with negative input end of operational amplifier 54 with resistance 52 by switch 48.Similarly, the movable terminal of variable resistor 58 is connected with negative input end of operational amplifier 54 with resistance 53 by switch 49.Negative input end of operational amplifier 54 is connected by resistance 55 with lead-out terminal.The plus end ground connection of operational amplifier 54.
On the other hand, as Fig. 6 and shown in Figure 7, search coil 16 is connected with the negative terminal of operational amplifier 54 by resistance 69.The lead-out terminal of add circuit 45 is connected with the input terminal of filter 66.The lead-out terminal of filter 66 is connected with the input terminal of amplifying circuit 67.The lead-out terminal of amplifying circuit 67 is connected with the input terminal of angle testing circuit 68.
The effect of the add circuit 45 with said structure is described.Fig. 9 shows the switching and selecting method of diverter switch 46,47,48,49.With first embodiment similarly, for the noise contribution that is comprised in the output of eliminating search coil 16, diverter switch 46～49 as following.
When noise contribution is SIN and COS synthetic, connecting (closure) switch 47 and switch 49 injects-SIN and-COS.In addition, noise contribution be SIN and-during COS synthetic, connect (closure) switch 47 and switch 48 and inject-SIN and COS.In addition, at noise contribution be-SIN and-during COS synthetic, connect (closure) switch 46 and switch 48 and inject SIN and COS.In addition, at noise contribution be-during SIN and COS synthetic, connect (closure) switch 46 and switch 49 inject SIN and-COS.The selection action of these switches is switched as required.
Selected elimination composition is added in the output of search coil 16, therefore, can eliminate the noise contribution that output comprised of search coil 16.
The characteristic of eliminating noise signal injection circuit 18,19 is to be determined by the resistance value of the resistance value of variable resistor 56,57,58,59 and the resistance 50,51,52,53 that is connected with switch 46,47,48,49.Promptly, according to the noise that output comprised of search coil 16, determine their value in advance, constitute add circuit 45 according to the resistance value of determining.
In addition, in the present embodiment, variable resistor 56 and resistance 51, variable resistor 57 and resistance 50, variable resistor 58 and resistance 53, variable resistor 59 and resistance 52 are connected respectively, still, as long as the side in variable resistor and the resistance is arranged, the opposing party can omit.Also can omit resistance 50,51,52,53, also can omit variable resistor 56,57,58,59.Under the situation of omitting variable resistor 56,57,58,59, the output of the output of the output of waveform circuit 41, amplifying circuit 42, the output of waveform circuit 43, amplifying circuit 44 is directly inputted to add circuit 45 respectively.
Fig. 8 shows the variation of second embodiment.The variation shown in Figure 8 and second embodiment are basic identical, therefore, difference only are described, save the explanation of repeating part.
In Fig. 8, do not use resistance 50,51,52,53 and switch 46,47,48,49.
And,, only on needs inject the terminal of signal component of composition, be connected with the negative terminal of resistance 64 with operational amplifier 54 by resistance 62 in order to eliminate noise.In the example of Fig. 8, show injection-SIN and-situation of COS, still, change because of the difference of noise contribution is injected into branch.
According to variation shown in Figure 8, can reduce the quantity of resistance and switch, thereby can reduce cost.In addition, identical with the situation of the embodiment of Fig. 7, can omit variable resistor.
As described above in detail, the resolver of second embodiment has following advantage: owing to directly utilize existing circuit, only need append switch 46,47,48,49, resistance 50,51,52,53, operational amplifier 54 etc., therefore can realize lower cost.In addition, in the resolver of reality,, therefore, noise contribution can be removed accurately, accuracy of detection can be improved by the next opposite signal of phase place that can correctly inject measured noise contribution of the noise contribution of measuring circuit.
Particularly, owing to above-mentioned resolver is characterised in that from the excitation signal of excitation signal output circuit 11,12 outputs be that high-frequency signal is carried out the signal that amplitude modulation obtains, therefore, even because of high frequency produces more noise, also these noises can be accurately removed, accuracy of detection can be improved.
In above execution mode, use the resolver of two-phase excitation, single-phase detection mode to be illustrated, still, the present invention also can be applied to the resolver of single-phase excitation, two-phase output type.In this case, excitation signal only is single-phase, but, in order to eliminate composition or its anti-phase composition of the excitation signal in the output signal that is included in resolver as noise, the composition synthetic (injection) of the anti-phase composition of excitation signal or the excitation signal output signal to resolver is got final product.In addition, as the example that is used for the output signal that excitation signal or anti-phase signal are synthesized to resolver is eliminated the structure of noise, identical with the embodiment of the resolver of two-phase excitation, single-phase detection mode, can use high frequency with core body, add circuit, be not to be defined in this still.
For example, in the present embodiment, high frequency is collaborated on core body 29, still at high frequency with the output of core body 24 with the output of core body 23 and high frequency, also high frequency can be divided into two with core body 29, accept high frequency respectively with the output of core body 23 and accept the output of high frequency with core body 24.
But, as present embodiment,, then get final product owing to core body is less if high frequency is made as one with core body 29, therefore can reduce this part cost, collaborate can not make the reverse inflow of noise.If promptly independently be provided with and accept the core body of high frequency respectively with the output of core body 23,24, then will be connected respectively to high frequency usefulness core body 23,24 o'clock from the output line of these each core bodys, though exist the high frequency that is connected with a side of core body independently to receive the possibility of noise from other core body with core body 23 or 24, but, as present embodiment, the core body of outlet side is made as a high frequency with core body 29, thus, can addresses the above problem.
Claims (6)
1. a resolver has: magnet exciting coil; The excitation signal output circuit, it is to above-mentioned magnet exciting coil output excitation signal; Search coil, it accepts the magnetic field by above-mentioned magnet exciting coil generation; And output signal processing circuit, it is to being handled by the detected detection signal of above-mentioned search coil, and this resolver is characterised in that,
Have noise canceller circuit, this noise canceller circuit is used for the inversion signal of above-mentioned excitation signal or above-mentioned excitation signal is synthesized to above-mentioned detection signal.
2. resolver according to claim 1 is characterized in that,
Above-mentioned noise canceller circuit has transformer.
3. resolver according to claim 2 is characterized in that,
Above-mentioned magnet exciting coil is two coils, and these two coils are respectively sinusoidal wave coil and cosine wave coil,
Above-mentioned transformer has three core bodys, these three core bodys be respectively the sinusoidal wave high frequency corresponding with above-mentioned sinusoidal wave coil with core body, with the corresponding cosine wave high frequency of above-mentioned cosine wave coil with core body and accept above-mentioned sinusoidal wave high frequency simultaneously with the output of core body and above-mentioned cosine wave high frequency output high frequency core body with the output of core body.
4. resolver according to claim 1 is characterized in that,
Above-mentioned noise canceller circuit has add circuit.
5. resolver according to claim 4 is characterized in that,
Above-mentioned noise canceller circuit has above-mentioned add circuit is applied as the sine-wave components of the regulation of above-mentioned elimination noise signal and the switching circuit or the resistance of cosine wave composition.
6. according to each the described resolver in the claim 1 to 5, it is characterized in that,
Above-mentioned excitation signal is high-frequency signal to be carried out amplitude modulation and the signal that obtains.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-073537 | 2009-03-25 | ||
| JP2009073537 | 2009-03-25 |
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| Publication Number | Publication Date |
|---|---|
| CN101847501A true CN101847501A (en) | 2010-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010140766 Pending CN101847501A (en) | 2009-03-25 | 2010-03-24 | Resolver |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102682983A (en) * | 2011-02-09 | 2012-09-19 | 爱三工业株式会社 | Resolver |
| CN105391368A (en) * | 2015-10-13 | 2016-03-09 | 沈阳东软医疗系统有限公司 | System for measuring position of treatment head diaphragm of linear accelerator |
| CN107076577A (en) * | 2014-11-06 | 2017-08-18 | 三菱电机株式会社 | Rotation angle detection apparatus and rotation angle detecting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2694649Y (en) * | 2004-04-05 | 2005-04-20 | 辅升电子科技(深圳)有限公司 | Microphone input circuit capable removing noises |
| CN1913347A (en) * | 2005-08-12 | 2007-02-14 | 泰克尼特克斯集团有限公司 | Signal splitter |
| JP2008256486A (en) * | 2007-04-04 | 2008-10-23 | Aisan Ind Co Ltd | Resolver |
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- 2010-03-24 CN CN 201010140766 patent/CN101847501A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2694649Y (en) * | 2004-04-05 | 2005-04-20 | 辅升电子科技(深圳)有限公司 | Microphone input circuit capable removing noises |
| CN1913347A (en) * | 2005-08-12 | 2007-02-14 | 泰克尼特克斯集团有限公司 | Signal splitter |
| JP2008256486A (en) * | 2007-04-04 | 2008-10-23 | Aisan Ind Co Ltd | Resolver |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102682983A (en) * | 2011-02-09 | 2012-09-19 | 爱三工业株式会社 | Resolver |
| CN107076577A (en) * | 2014-11-06 | 2017-08-18 | 三菱电机株式会社 | Rotation angle detection apparatus and rotation angle detecting method |
| CN107076577B (en) * | 2014-11-06 | 2019-07-23 | 三菱电机株式会社 | Rotation angle detection apparatus and rotation angle detecting method |
| CN105391368A (en) * | 2015-10-13 | 2016-03-09 | 沈阳东软医疗系统有限公司 | System for measuring position of treatment head diaphragm of linear accelerator |
| CN105391368B (en) * | 2015-10-13 | 2018-03-20 | 沈阳东软医疗系统有限公司 | A kind of system for measuring linear accelerator treatment head stop position |
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