CN1621705A - Bearing with rotation sensor and electric motor using the same - Google Patents
Bearing with rotation sensor and electric motor using the same Download PDFInfo
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- CN1621705A CN1621705A CNA2003101157524A CN200310115752A CN1621705A CN 1621705 A CN1621705 A CN 1621705A CN A2003101157524 A CNA2003101157524 A CN A2003101157524A CN 200310115752 A CN200310115752 A CN 200310115752A CN 1621705 A CN1621705 A CN 1621705A
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Abstract
The present invention relates to one kind of bearing with rotation sensor and motor with the bearing. The output signal of leakage magnetic flux has minimized duty ratio variation, and even if inside the use environment with externally applied leakage magnetic flux, stable sensor output may be obtained. There are detected part with alternately arranged N poles and S poles set on the rolling bearing on the rotating side; corresponding detecting part comprising magnetic sensors to generate analog output set on the rolling bearing on the fixed side; and differential output generating mechanism set to use the differential output of two adjacent magnetic sensors as the phase coding signal.
Description
Technical field
The present invention relates to bearing with turn-sensitive device, particularly relate to widely used motor such, produce bigger magnetic field near the bearing of band turn-sensitive device of use.
Background technique
Fig. 8 is the longitudinal sectional view of the bearing of band turn-sensitive device in the past.In Fig. 8, the bearing 51 of band turn-sensitive device is by by inner ring 52, outer ring 53, and the rolling bearing that rolling element 54 and retainer 55 are formed constitutes, at rotary side (such as, inner ring 52 sides), the fixedly magnetic encoder 56 of ring-type.In non-rotating side (such as, outer ring 53 sides), according to being fixed with the magnetic sensor 57 that forms by Hall element etc. with above-mentioned magnetic encoder 56 opposed modes.This magnetic encoder 56 is formed by rubber magnetite etc., along the circumferential direction, magnetizes according to the mode that the N utmost point and the S utmost point replace.This magnetic sensor 57 is according to the mode that is inserted in the resin enclosure 58, and by resin molded, this resin enclosure 58 is by metal shell 59, and is chimeric with outer ring 53, thus, is fixed on the outer ring 53.
By such formation, follow the rotation of inner ring 52, the magnetic variation of 57 pairs of magnetic encoders 56 of magnetic sensor detects, and this testing signal is the such increment rotational pulse signal of Fig. 9.Can understand number of revolution, the sense of rotation of inner ring 52 according to this signal.The bearing of such band turn-sensitive device is small-sized and need not assembling and adjust to have firm characteristics in addition, is used for motor support bearing etc. and locates.
With reference to the open communique of No. 174258/2002 application for a patent for invention of Japan
But in the magnetic circuit of the coil that produces big magnetic field, magnetite, the occasion of assembling the bearing of band turn-sensitive device shown in Figure 8 is because the leakage magnetic flux of external magnetic field can produce the situation of the output generation misoperation of the bearing 51 of being with turn-sensitive device.
Below with for example as shown in Figure 10, the occasion that the bearing of band turn-sensitive device is assemblied on the motor is that example is described.In the example shown in this figure, be assemblied in rotor 61 on the running shaft 62 by front side bearing 64 be equipped with the back side bearing 65 of turn-sensitive device, be supported on the shell 63, stator 60 is fixed on the shell 63.Flow through the occasion of stator 60 at bigger electric current, can not ignore flowing through of magnetic flux, shown in the arrow in this figure, produce from rotor 60, by running shaft 62, and inner ring 52, outer ring 53, shell 63 turns back to the magnetic loop of stator 60.In addition, if the flow direction of electric current is opposite, then magnetic loop is an opposite direction.
At this moment, if between inner ring 52 and outer ring 53, removal rolling element 54 and retainer 55, because nonmagnetic portion accounts for main body, magnetic resistance increases, so magnetic flux leaks easily, this leakage magnetic flux impacts magnetic sensor 57.
Generally, magnetic sensor 57 adopts by Hall element and output signal with this Hall element and is converted to Hall IC that the IC of digital signal constitutes, MR element (magnetoresistive element) etc.Figure 11 is that example is formed in the inside of Hall IC.Except having the Hall element 71 that detects magnetic, also have amplification circuit 72, Schmidt trigger circuit 73, output transistor 74.Hall IC has the power of following magnetic field, realizes the switchtype of switching, alternately applies with the S utmost point and the N utmost point of magnetite, switches these two kinds of the alternately magnetic field type connecting, disconnect, and still, turn-sensitive device generally adopts the latter's alternately magnetic field type.Here, be example with the occasion that adopts Hall IC shown in Figure 11, the influence of leakage magnetic flux is described.
Do not having the occasion of leakage magnetic flux,, following the rotation of magnetic encoder 56 (Fig. 8), on the Hall IC of magnetic sensor 57, adding alternately magnetic field as shown in Figure 12.The simulation output of this Hall element is converted to the pulse signal that carries out break-make repeatedly when surpassing threshold value, the dutycycle of this output (Tp/Tn) is about 50%.
If add leakage magnetic flux, then as shown in Figure 13 A, be added on the direction of following leakage magnetic flux as the alternately magnetic field on the Hall IC of magnetic sensor outward, here, along skew up and down from the outside.Thus, the output for as the Hall IC of magnetic sensor resembles Figure 13 B, and Figure 13 C is such, and dutycycle changes.In addition, it is strong more to have leakage magnetic flux, and its side-play amount is big more, and the output pulse is damaged, the shortcoming that output can't realize etc. fully.
Summary of the invention
The object of the present invention is to provide a kind of bearing with turn-sensitive device, the bearing of this band turn-sensitive device can reduce the influence because of the leakage magnetic flux that flows through magnetic sensor, and chaotic situation takes place code signal, can obtain stable sensor output.
Another object of the present invention is to provide a kind of motor, this motor is not subjected to the influence of the magnetic flux that motoring uses, and can correctly be rotated detection.
The bearing of band turn-sensitive device of the present invention relates to following bearing, wherein, inside at rolling bearing, be provided with the rotation sensing apparatus of the rotational speed that detects solid of rotation, this rolling bearing comprises inner ring and the outer ring that forms the rolling bearing circle respectively, and is received in a plurality of rolling elements between this inside and outside rolling bearing circle.
Above-mentioned rotation sensing apparatus constitutes with magnetic detection portion by examined, this examined portion is installed on the rolling bearing circle of the rotary side in the above-mentioned inside and outside rolling bearing circle, carry out the magnetization of magnetic property according to the mode that the N utmost point, the S utmost point replace, this magnetic detection portion according to this examined opposed mode, be installed on the rolling bearing circle of fixed side.This magnetic detection portion has the magnetic sensor of simulation output, this magnetic sensor is provided with according to a plurality of modes side by side along the circumferential direction, differential output generating mechanism is set, this differential output generating mechanism with the differential output of 2 magnetic sensors as the code signal of 1 phase mass and handle.Above-mentioned code signal is the pulse signal such as rectangular wave etc.Above-mentioned 2 magnetic sensors are the type that is provided with such as in abutting connection with ground.Above-mentioned 2 magnetic sensors both can be more than 2 groups with the differential output generating mechanism that its action output is handled, and also can have more than at least 1 group.
If adopt this scheme, because by above-mentioned differential output generating mechanism, with the differential output of 2 magnetic sensors as the code signal of 1 phase mass and handle, even so under the situation that leakage magnetic flux impacts magnetic sensor, still the influence to the code signal that constitutes output signal can be suppressed at minimum degree.Such as, can suppress the situation that the dutycycle of code signal changes, prevent misoperation.Thus, even under the Environmental Conditions that adds the external leaks magnetic flux, still obtain stable output.
2 magnetic sensors that obtain differential output also can be according in the magnetized magnetic repeatedly of the mode phase place that replaces according to the N utmost point, the S utmost point that has in examined being that the mode of the magnetic phase differences of 180 degree is provided with substantially.Substantially be the occasion that the mode of magnetic phase differences of 180 degree is provided with according to having, even owing to be under 1 the situation in the gain of differential output generating mechanism, still make the amplitude of differential output amplify about 2 times,, be difficult to obtain the effect of the influence of leakage magnetic flux so can expect the sensitivity raising.Above-mentioned is substantially the phase differences of 180 degree for being the phase differences in cycle repeatedly of unit with 360 degree, such as, as 540 degree etc., be the occasion that surpasses the phase differences of 360 degree, to spend with 360 be the phase difference that divisor carries out the remainder that division arithmetic obtains in order to constitute.
In addition, 2 magnetic sensors that obtain differential output preferably closely are provided with, but even best under the situation that can not closely be provided with, 90 degree that still are arranged at fixed side rolling bearing circle are with in the interior scope.
Configuration relation at 2 magnetic sensors surpasses 90 occasions of spending, and the direction that leakage magnetic flux is passed magnetic sensor is different in each magnetic sensor, and the output offset amount direction of magnetic sensor is opposite each other.Thus,, still can't eliminate side-play amount fully, estimate that the change in duty cycle amount of code signal can increase even under the situation of the difference of obtaining output signal.Preferably be arranged in 90 degree.
In addition, even magnetic sensor also can be according to applying under the situation of external magnetic field, still be in the type of the mode of the saturated state of non-output with the low sensitivity use with doing one's utmost.That is, even magnetic sensor, still is in the type of state of the low sensitivity of non-output degree of saturation under the situation of the external magnetic field of the Environmental Conditions of the bearing that applies this band turn-sensitive device.
Be added on outside under the bigger environment of leakage magnetic flux on the magnetic sensor, the output offset amount that also has magnetic sensor increases, and is in the situation of saturation state.In this occasion,,,, produce the damaged of pulse in the poorest occasion so dutycycle changes because the magnetic sensor output waveform is destroyed.In the occasion of under the environment of stronger leakage magnetic flux effect, using like this, can use according to the mode of the sensitivity that reduces magnetic sensor, thus, can suppress saturated.
Be respectively the occasion of Hall element at 2 magnetic sensors that obtain differential output, the consistent processing mechanism of output reference voltage also can be set, this mechanism is according to being reference potential with one output mid point in these 2 Hall elements, the output mid point of another Hall element is and the mode of the essentially identical voltage of said reference voltage, the supply voltage of another Hall element is controlled.
Adopt the occasion of Hall element at magnetic sensor, act on Hall element supply voltage pact half be output reference voltage.Because the effect of this element, this value produces difference, and in addition, the characteristic value of sensitivity etc. is also different knifeedge, so even under the situation of the output difference of obtaining 2 elements, still have the situation that can't remove the side-play amount of leakage magnetic flux fully.The characteristic of Hall element can not compensate, and still, handles if can carry out conformity to output reference voltage, then can suppress side-play amount, can further reduce the variation of dutycycle.
Motor of the present invention comprises shell, be fixed in stator on this shell, according to being provided with the opposed mode of this stator, be fixed in the rotor on the running shaft, the bearing of band turn-sensitive device of the present invention is adopted in the supporting that it is characterized in that the running shaft of motor.
The bearing of the band turn-sensitive device of the running shaft of supporting motor is under the environment with leakage magnetic flux, if still adopt the bearing of band turn-sensitive device of the present invention, then can reduce the influence of leakage magnetic flux to code signal, obtains stable coding output.
Description of drawings
Figure 1A is the partial sectional view of bearing of the band turn-sensitive device of one embodiment of the present of invention;
Figure 1B is magnetic encoder and the design composition of magnetic sensor and the explanatory drawing that circuit is formed example of the bearing of the above-mentioned band turn-sensitive device of expression;
Fig. 2 A～2D is the plotted curve of the output of the each several part of the above-mentioned magnetic sensor of expression;
Fig. 3 is the explanatory drawing of the distortion example of the output processing circuit of this magnetic sensor of expression;
Fig. 4 is the also explanatory drawing of a distortion example of expression magnetic sensor and its output processing circuit;
Fig. 5 is the side view of the bearing of the band turn-sensitive device of the configuration relation of expression magnetic sensor;
Fig. 6 has the explanatory drawing of output processing circuit of the magnetic sensor of the consistent processing mechanism of output reference voltage for expression;
Fig. 7 is the sectional view of an example of the motor of the bearing of employing band turn-sensitive device of the present invention;
Fig. 8 is the sectional view of the bearing of existing band turn-sensitive device;
Fig. 9 is the plotted curve of its output of expression;
Figure 10 is the sectional view of the motor of the bearing of the existing band turn-sensitive device of employing;
Figure 11 is the circuit diagram of existing Hall IC;
Figure 12 is the plotted curve of its output;
Figure 13 A～13C has the plotted curve of occasion of the external magnetic field of this output for expression.
Embodiment
By Fig. 1 and Fig. 2, the 1st embodiment of the present invention is described.In the bearing 31 of this band turn-sensitive device, inside at rolling bearing 30, be provided with rotation sensing apparatus 40, this rotation sensing apparatus 40 detects the rotational speed by the solid of rotation (not shown) of bearing 31 supportings of above-mentioned band turn-sensitive device, this rolling bearing 30 has a pair of rolling bearing circle 32 that constitutes inner ring and outer ring, 33, with a plurality of rolling elements 34 that are received between these rolling bearing circles 32,33.Each rolling element 34 is received in the cover at a plurality of positions of circumferencial direction that are arranged at retainer 35.Rolling bearing 30 is by constituting such as deep groove ball bearing.
Figure 1B is the figure of the composition behind examined 1 of expression taking-up in a schematic way and the detection unit 2.Be installed on examined 1 magnetized magnetic encoder that adopts the mode that replaces according to the N utmost point, the S utmost point to carry out magnetic property on the end face of rolling bearing circle 32.As examined 1 supporting metalwork 1a of this magnetic encoder by ring-type, constitute with the magnetic 1b that is arranged at its outer circumferential side, it is fixed on the rolling bearing circle 32 by supporting metalwork 1a.Magnetic 1b adopts such as, rubber magnetite, and it is adhered on the supporting metalwork 1a by sclerosis.This magnetic 1b both can be formed by plastics magnetite, sintered magnet or metal magnetite, in these occasions, supporting metalwork 1a can be set also.
According to examined 1 opposed mode, be installed on the magnetic detection portion 2 on the fixed side rolling bearing circle 33, adopt 2 magnetic sensor 2a that the variation of Magnetic flux density is exported as analogue signal, 2b.These 2 magnetic sensor 2a, 2b along the circumferential direction, spacing according to the rules in this example, is provided with according to the mode of the magnetic phase differences with 180 degree.This magnetic phase difference is the phase difference in the magnetized magnetic phase difference of mode that replaces according to the N utmost point, the S utmost point in examined 1.This magnetic sensor 2a, 2b can adopt such as Hall element, simulate the Hall IC of output type etc.In the present embodiment, magnetic sensor 2a, 2b adopts Hall element.This Hall IC is the IC (intergrated circuit) with Hall element.At magnetic sensor 2a, 2b adopts the occasion of Hall element, and each Hall element is output as 2 outputs of the antiphase of anodal and negative pole, carries out differential amplification by action enlarger 3,3 ', forms the Hall element signal.When representing by Figure 1B, magnetic sensor 2a, the output signal of 2b is respectively A, the signal of A ' point.Action enlarger 3,3 ' adopts operational amplifier.
Above-mentioned 2 magnetic sensor 2a, the simulation of 2b is input to differential output as the code signal of a phase mass and in the differential output generating mechanism of handling 7.This differential output generating mechanism 7 is made of the differential amplifier circuit 4 that adopts operational amplifier, the comparator 5 that the output of this differential amplifier circuit 4 is handled according to the mode that forms rectangle.
Action to above-mentioned composition is described below.If examined 1 according to the rotation of certain speed, then as 2 magnetic sensor 2a of adjacency, the A of the output of 2b, the output of A ' point resembles Fig. 2 A, shown in the dotted line among Fig. 2 B like that, be benchmark with constant voltage (Vc/2), be sinusoidal wave shape and change.Voltage Vc represents supply voltage.,, then resemble Fig. 2 A here if add leakage magnetic flux, shown in the solid line among the 2B like that, magnetic sensor 2a, the output of 2b is followed the increase of leakage magnetic flux and is offset.In addition, the direction of outside magnetic flux is followed and difference in the offset direction.In addition, when the amount of supposition leakage magnetic flux is basic identical, 2 magnetic sensor 2a, the respective offsets amount of the sensitivity of 2b is all basic identical.
Then, if obtain magnetic sensor 2a by the differential enlarger 4 that adopts operational amplifier, the output A of 2b, the differential amplification of the signal of A ' then can obtain to get rid of the signal (Fig. 2 C) of the skew composition of leakage magnetic flux.In addition, at magnetic phase difference according to 180 degree, 2 magnetic sensor 2a are set, the occasion of 2b, because the amplitude (B point) after the differential output is even be under 1 the situation in the gain of differential enlarger 4, also amplify 2 times basically, improve, be difficult to obtain the effect of the influence of leakage magnetic flux so can expect sensitivity.In addition, in the occasion of this example, the differential output of differential enlarger 4 is exported according to the voltage reference of Vc/2.In back level, the voltage that can stipulate (Vc/2) be benchmark, adopt comparator 5, handles according to the mode that forms rectangle, and as shown in Fig. 2 D, the code signal of 1 few phase mass of the change in duty cycle amount of influence of leakage magnetic flux has been eliminated in acquisition.
In addition, differential output generating mechanism 7 also can replace aforesaid, the mode that is made of differential enlarger 4 and comparator 5, and as shown in Figure 3, by to 2 magnetic sensor 2a, the output of 2b compares, and the comparator of handling according to the mode that forms rectangle 5 constitutes.Equally in this occasion, with 2 magnetic sensor 2a, the differential output of 2b is as the code signal of 1 phase mass and handle.
In above-mentioned description, the occasion that the coding of 1 phase mass is exported is described, but 2 phase place outputs in A phase, B phase are necessary occasions, as Fig. 4, at the magnetic sensor 2a of magnetic phase place and the 1st group, 2b differs from the positions of 90 degree, the 2nd group of magnetic sensor 2c is set, 2d at every group of magnetic sensor, is provided with the signal processing mechanism of differential output generating mechanism 7 grades identical with above-mentioned each example.In addition, in Fig. 4, mode according to the accessory circuit that omits magnetic sensor 2a～2d is represented, in these magnetic sensors 2a～2d, circuit in the scope H that dotted line by Fig. 1 centers on all is set, that is the circuit of differential enlarger 3 of 2 outputs of opposite phase of the positive pole of Hall element and negative pole, is set.In the example of Fig. 4, after the differential amplification of carrying out 2 magnetic sensor outputs is handled, by comparator 5, handle according to the mode that forms rectangle, but obviously also can resemble as described in Fig. 3, omit differential enlarger 4, only, constitute differential amplification generating mechanism 7 by comparator 5.
As described in resembling up till now,, must obtain 2 magnetic sensor 2a, 2b (2c, differential output 2d) in order to obtain the output of 1 phase mass of comparator.This sensor configuration as shown in Figure 5, is arranged at according to 2 magnetic sensor 2a, the occasion of the position that the essentially identical mode of the influence of the leakage magnetic flux of 2b is approaching, and opposing leakage magnetic flux degree improves.
Even in the restriction that has in the configuration, can not make 2 magnetic sensor 2a, under the approaching situation of 2b, be preferably in 90 degree of fixed side rolling bearing circle 33,2 magnetic sensor 2a are set, 2b.Such as, another magnetic sensor 2b is as the dotted line position 2b ' of Fig. 5, a relative magnetic sensor 2a, the occasion that surpasses 90 degree and be provided with, because it is different in each magnetic sensor that leakage magnetic flux is passed the direction of magnetic sensor, so the output offset direction of magnetic sensor is opposite each other, even under the situation of the difference of obtaining output signal, still can't eliminate skew fully.In this occasion, estimate that the change in duty cycle of code signal increases.Thus, be preferably disposed in 90 degree.
In addition, to magnetic sensor 2a, under the bigger environment of the leakage magnetic flux of 2b effect, also have magnetic sensor 2a, the output offset amount of 2b increases, and becomes the situation of saturation state.In this occasion,,,, produce the damaged of pulse in the poorest occasion so dutycycle changes because the magnetic sensor output waveform is destroyed.
In such effect the occasion of using under the environment of stronger leakage magnetic flux is arranged, if according to magnetic sensor 2a, the sensitivity of 2b is used less than the mode of the sensitivity of common use, then can suppress saturated.This method can realize in following occasion, this occasion refers to as magnetic sensor 2a, when 2b is Hall element, the applied voltage of Hall element is less than the applied voltage for the standard of this Hall element, and the driving current that maybe will flow through Hall element is set in the low degree of current value of the standard that is compared to Hall element.In addition, in the violent occasion of the temperature variation of Environmental Conditions, preferably adopt the few constant voltage driving mode of change of sensitivity of Hall element.
At magnetic sensor 2a, 2b adopts the occasion of Hall element, and half the value of pact that is added on the supply voltage VH of Hall element outward is output reference voltage (VH/2).Because because of the effect of element, this value has difference, in addition, the eigenvalue of sensitivity etc. is also different knifeedge, even under the situation of the output difference of obtaining 2 elements, still has the situation of the skew that the magnetic flux of can't stopping a leak fully causes.The characteristic of Hall element can't compensate, if but can carry out conformity to output reference voltage VH/2 and handle, then can suppress side-play amount, can further reduce change in duty cycle.
Fig. 6 represents to be used for the reference potential between the Hall element is carried out the practical circuit of the consistent processing mechanism 8 of output reference voltage of conformity processing.As between the Out let of the positive pole of the Hall element of a magnetic sensor 2a who obtains differential output and negative pole by 2 resistor R 1, the R2 series connection, two resistor R 1, the intermediate point of R2 is the reference voltage V H/2 of this Hall element.As between the Out let of the positive pole of the Hall element of another magnetic sensor 2b and negative pole also by 2 resistor R 3, the R3 series connection.The voltage difference feeler mechanism 6 of the difference of corresponding middle point voltage (voltage of voltage VH/2 and intermediate point P) is obtained in setting, the output of this voltage difference feeler mechanism 6 as be another magnetic sensor 2b Hall element power supply and connect.Thus, according to the mode that the voltage of intermediate point P equates with middle point voltage VH/2, the supply voltage of another magnetic sensor 2b is controlled.Voltage difference feeler mechanism 6 is differential enlarger, constitutes by operational amplifier.The consistent processing mechanism 8 of output reference voltage is made of these voltage difference feeler mechanisies 6 and above-mentioned each resistor R 1～R4.In addition, in the example of Fig. 6,, obtain the output of a side of each Hall element, thus, obtain the output of comparator rectangle by comparator 4, even but before comparator 4, identical with the example of Fig. 1, also differential enlarger can be set.
As described in resembling up till now, even if having under the environment of leakage magnetic flux, still can stably obtain the output of encoder, then can adopt the bearing 31 of this band turn-sensitive device, even the block bearing at the motor reel with leakage magnetic flux adopts the bearing 31 of the band turn-sensitive device of description this time, using still can be out of question.
Fig. 7 represents an example of this motor.This motor has adopted the bearing of band turn-sensitive device of the present invention in the motor of describing with Figure 10.Specifically, in this motor, be assemblied in rotor 61 bearing 64,65 by two ends on the running shaft 62, be supported on the shell 63.Stator 60 has stator coil 60a, and it is fixed on the shell 63.In the bearing 64,65 of both sides, one of them bearing 65 adopts the turn-sensitive device 31 of bearing of above-mentioned any embodiment's of the present invention band turn-sensitive device.One of them bearing 65 that the bearing 31 of band turn-sensitive device is installed is such as the back side bearing.Another bearing 64 adopts the rolling bearing that does not have turn-sensitive device.
In addition, in the various embodiments described above, examined 1 and magnetic detection portion 2 are radially opposed, and still, the present invention also can be suitable for the bearing of examined 1 and the radially opposed band turn-sensitive device of magnetic detection portion 2.
As above-mentioned, with reference to accompanying drawing, the embodiment who is fit to is described, still,, watch this specification if be those of ordinary skill in the art, in obvious scope, expect various conversion and alter mode easily.So such conversion and alter mode are interpreted as by the content in the scope of the present invention.
Claims (6)
1. bearing with turn-sensitive device, wherein, inside at rolling bearing, be provided with the rotation sensing apparatus of the rotational speed that detects solid of rotation, this rolling bearing comprises inner ring and the outer ring that forms the rolling bearing circle respectively, and be accommodated in a plurality of rolling elements between this inside and outside rolling bearing circle, it is characterized in that:
Above-mentioned rotation sensing apparatus constitutes with magnetic detection portion by examined, this examined portion is installed on the rolling bearing circle of the rotary side in the above-mentioned inside and outside rolling bearing circle, according to the N utmost point along the circumferential direction, the mode that the S utmost point replaces is carried out the magnetization of magnetic property, this magnetic detection portion according to this examined opposed mode, be installed on the rolling bearing circle of fixed side, this magnetic detection portion has the magnetic sensor of simulation output, this magnetic sensor is provided with according to a plurality of modes side by side along the circumferential direction, differential output generating mechanism is set, this differential output generating mechanism with the differential output of 2 magnetic sensors as the code signal of 1 phase mass and handle.
2. the bearing of band turn-sensitive device according to claim 1,2 magnetic sensors that it is characterized in that obtaining differential output are according in the magnetized magnetic repeatedly of the mode phase place that replaces according to the N utmost point, the S utmost point with examined portion being that the mode of the magnetic phase differences of 180 degree is provided with substantially.
3. the bearing of band turn-sensitive device according to claim 1 is characterized in that 2 magnetic sensors that obtain differential output are arranged at 90 degree of fixed side rolling bearing circle with in the interior scope.
4. the bearing of band turn-sensitive device according to claim 1, even it is characterized in that magnetic sensor that above-mentioned magnetic detection portion adopted under the situation of the external magnetic field of the Environmental Conditions of the bearing that applies this band turn-sensitive device, still is in the state of the low sensitivity of non-output degree of saturation.
5. the bearing of band turn-sensitive device according to claim 1, it is characterized in that 2 magnetic sensors that obtain differential output are respectively Hall element, the consistent processing mechanism of output reference voltage is set, this mechanism is according to being reference potential with one output mid point in these 2 Hall elements, the output mid point of another Hall element becomes the mode with the essentially identical voltage of said reference voltage, and the supply voltage of another Hall element is controlled.
6. motor, this motor comprises shell, be fixed in stator on this shell, according to being provided with the opposed mode of this stator, be fixed in the rotor on the running shaft, it is characterized in that the bearing of the described band turn-sensitive device of supporting employing claim 1 of above-mentioned running shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101157524A CN100394188C (en) | 2003-11-28 | 2003-11-28 | Bearing with rotation sensor and electric motor using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101157524A CN100394188C (en) | 2003-11-28 | 2003-11-28 | Bearing with rotation sensor and electric motor using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1621705A true CN1621705A (en) | 2005-06-01 |
| CN100394188C CN100394188C (en) | 2008-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101157524A Expired - Fee Related CN100394188C (en) | 2003-11-28 | 2003-11-28 | Bearing with rotation sensor and electric motor using the same |
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| CN (1) | CN100394188C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100547254C (en) * | 2007-08-10 | 2009-10-07 | 重庆大学 | The intelligent bearing of band composite sensor |
| CN101995433A (en) * | 2009-08-17 | 2011-03-30 | 通用电气公司 | Apparatus and method for bearing condition monitoring |
| CN102996655A (en) * | 2011-09-16 | 2013-03-27 | Skf公司 | Bearing and wind power plant |
| CN103384774A (en) * | 2010-12-20 | 2013-11-06 | Skf公司 | Power generator integrated with bearing |
| CN111148914A (en) * | 2017-09-29 | 2020-05-12 | 黑拉有限责任两合公司 | Bearing comprising an inner ring, an outer ring and a sensor, and system comprising such a bearing |
| CN111835150A (en) * | 2019-04-18 | 2020-10-27 | 日本电产株式会社 | Electric motor |
| CN112555276A (en) * | 2019-09-25 | 2021-03-26 | 保时捷股份公司 | Rolling bearing with sensor and drive unit |
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| US5293125A (en) * | 1992-01-17 | 1994-03-08 | Lake Shore Cryotronics, Inc. | Self-aligning tachometer with interchangeable elements for different resolution outputs |
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| JP4014359B2 (en) * | 2000-12-06 | 2007-11-28 | Ｎｔｎ株式会社 | Bearing with rotation sensor and motor using the same |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100547254C (en) * | 2007-08-10 | 2009-10-07 | 重庆大学 | The intelligent bearing of band composite sensor |
| CN101995433A (en) * | 2009-08-17 | 2011-03-30 | 通用电气公司 | Apparatus and method for bearing condition monitoring |
| CN101995433B (en) * | 2009-08-17 | 2014-03-12 | 通用电气公司 | Apparatus and method for bearing condition monitoring |
| CN103384774A (en) * | 2010-12-20 | 2013-11-06 | Skf公司 | Power generator integrated with bearing |
| CN103384774B (en) * | 2010-12-20 | 2016-01-20 | Skf公司 | The generator of integrated bearing |
| CN102996655A (en) * | 2011-09-16 | 2013-03-27 | Skf公司 | Bearing and wind power plant |
| CN111148914A (en) * | 2017-09-29 | 2020-05-12 | 黑拉有限责任两合公司 | Bearing comprising an inner ring, an outer ring and a sensor, and system comprising such a bearing |
| CN111835150A (en) * | 2019-04-18 | 2020-10-27 | 日本电产株式会社 | Electric motor |
| CN112555276A (en) * | 2019-09-25 | 2021-03-26 | 保时捷股份公司 | Rolling bearing with sensor and drive unit |
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| CN100394188C (en) | 2008-06-11 |
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