CN1319251C - Device for judging brush state of motor - Google Patents
Device for judging brush state of motor Download PDFInfo
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- CN1319251C CN1319251C CNB2005100588207A CN200510058820A CN1319251C CN 1319251 C CN1319251 C CN 1319251C CN B2005100588207 A CNB2005100588207 A CN B2005100588207A CN 200510058820 A CN200510058820 A CN 200510058820A CN 1319251 C CN1319251 C CN 1319251C
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- 238000005259 measurement Methods 0.000 claims description 45
- 238000001514 detection method Methods 0.000 claims description 28
- 238000012360 testing method Methods 0.000 claims description 28
- 238000005299 abrasion Methods 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000003990 capacitor Substances 0.000 description 6
- 238000007689 inspection Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 210000001138 tear Anatomy 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The invention provides a technology that precisely estimates a life from the wear of a power feeding brush by exactly determining the contact state of the power feeding brush to a rectifier of a motor. The motor M comprises: the rectifier 12; a cathode brush 18 arranged at the rectifier 12 so as to abut thereon; a low-rotation side anode brush 20; and a high-rotation side anode brush 22. The high-rotation side anode brush 22 is formed so as to reach a limit friction amount preceding to the low-rotation side anode brush 20 and the cathode brush 18 by friction caused by the rotation of the rectifier 12. By detecting that the high-rotation side anode brush 22 has reached the limit friction amount, the friction state of the low-rotation side anode brush 20 that keeps an abutment state against the rectifier 12 and that of the cathode brush 18 can be estimated.
Description
Technical field
The present invention relates to a kind of device for judging brush state of motor, be used for judging the state of the brush that contacts with the motor commutator, such as, it can judge the state of wear of brush.
Background technology
Usually, direct current machine comprises commutator that switches the armature coil sense of current and the power supply brush of giving the commutator supplying electric current.This direct current machine simple structure, the performance ideal, low cost of manufacture is widely used in the various devices such as vehicle.
Rotate simultaneously with armature under commutator maintenance and the power supply brush state of contact, so the power supply brush is brushed on commutator and moved when motor rotates.Because the power supply brush is crushed on the commutator keeping the contact condition with commutator, so, follow the rotation of commutator, the power supply brush can wear and tear gradually.Particularly, when commutator begins to rotate, can produce spark or heating between commutator and the power supply brush, the wearing and tearing of aggravation power supply brush.
For guaranteeing excellent contact state between power supply brush and the commutator, the someone has proposed to monitor the technology of power supply wear of brush state.Such as, the spy opens flat 10-14177 patent disclosure bulletin and has disclosed a kind of by the method for the perforate on the shell with the visual determination brush life.In addition, open in the technology of clear 63-202091 patent disclosure bulletin announcement the spy, except that the lead-out wire that is placed in usually on the brush, receive lead-out wire that is used to detect wear mark on the brush again, detect the wearing and tearing of lead-out wire according to the state of insulation of this wear mark detection lead-out wire.
Can not measure brush life continuously consistently with vision, and the measurement result of brush life varies with each individual.In addition, when using wear mark detection lead-out wire to detect the wearing and tearing of brush, need to process brush in addition and receive on the brush so that wear mark is detected lead-out wire, thus general general commutator brush can not be used, more loaded down with trivial details.
So, need exploitation a kind of simple, can measure the technology of power supply brush life at any time exactly.
Summary of the invention
The purpose of this invention is to provide a kind of contact condition that can measure power supply brush and motor commutator exactly, according to the state of wear of the brush of powering accurately estimate the to power technology of brush life.
The invention provides a kind of device for judging brush state of motor, it comprises: rotating commutator; The power supply brush, it contacts with commutator, provides electric current to commutator; The wear measurement brush, it contacts with commutator, and the wearing character of the wear measurement brush that produces when commutator rotates is different with the wearing character of power supply brush; And the abrasion detection unit, it detects the state of wear amount of the wear measurement brush that produces when commutator rotates.
In above device for judging brush state of motor, the wearing character of being rotated the wear measurement brush that produces by commutator is different with the wearing character of power supply brush, so, from the state of wear amount of the detected wear measurement brush in abrasion detection unit, can estimate and judge the state of wear of power supply brush.
Here, " wearing character " can be arbitrarily with the relevant quantity of state that weares and teares, such as, wear extent, perhaps, the resistance value that changes with state of wear.
As an embodiment, because the wearing and tearing that commutator produces when rotating, the wear measurement brush is than the power supply brush wear extent that reaches capacity earlier, the wear extent that the abrasion detection unit detects the wear measurement brush wear extent that whether reaches capacity.
In above device for judging brush state of motor, the wear measurement brush is than the power supply brush wear extent that reaches capacity earlier, and the abrasion detection unit detects the wear extent of the wear measurement brush wear extent that whether reaches capacity.So, when the wear extent that detects the wear measurement brush when the abrasion detection unit has reached capacity wear extent, can estimate and the state of wear of judgement and the contacted power supply brush of commutator.
Here, " tear-to-wear allowance " can instigate the limiting value of the wear extent that can't well contact between power supply brush and the commutator, and it is to be decided by the various factors that may influence the wear extent of brush.Such as, these factors can comprise the sectional area of the brush that contacts with commutator, the length of the brush that can effectively contact with commutator, and brush is to the commutator applied pressure, the resistance value of brush unit length (promptly than resistance value), perhaps heating temp during machine operation or the like.In addition, wear measurement brush and power supply brush can have tear-to-wear allowance separately.
As an embodiment, above-mentioned device for judging brush state of motor also comprises the state of wear identifying unit, and it judges the state of wear of power supply brush according to the testing result of abrasion detection unit.
Like this, can judge by the state of wear identifying unit with the state of wear of the contacted power supply brush of commutator.
As an embodiment, when the wear extent that detects the wear measurement brush when the abrasion detection unit had reached capacity wear extent, the state of wear identifying unit judged that the wear extent of power supply brush is near tear-to-wear allowance.
Like this, can judge and the state of wear of the contacted power supply brush of commutator and the relation of tear-to-wear allowance from the wear extent of wear measurement brush.
As an embodiment, the wear measurement brush can have the function of power supply brush.
Like this, the wear measurement brush also can be used as the power supply brush, so can enlarge the application of motor.
As an embodiment, the power supply brush comprises anode brush and negative electrode brush, and the wear measurement brush has the function of anode brush.
Like this, the wear measurement brush also can be used as the anode brush, so can enlarge the range of application of motor.
As an embodiment, when commutator rotated under slow-speed of revolution pattern, the anode brush and the negative electrode brush of power supply brush provided electric current to commutator, when commutator rotates under high rotating speed pattern, the wear measurement brush, and the negative electrode brush of power supply brush provides electric current to commutator.
Like this, under high rotating speed pattern, can be used as the anode brush and be provided electric current to commutator than reach capacity the earlier wear measurement brush of wear extent of power supply brush.Under high rotating speed pattern,, the tendency of enhance faster wear speed is arranged owing to factors such as sparks.In the present embodiment, the wear measurement brush is used for the high faster rotating speed pattern of the rate of wear.
It is noted that the present invention is not limited to above each embodiment.The technical scheme that above each embodiment appropriate combination is obtained, and the present invention is made suitable modification to the those of ordinary skill in this field and the technical scheme that obtains also belongs to protection scope of the present invention.
According to the present invention, the state of wear of brush of powering can be estimated and judge to the wearing character of the wearing character of utilizing the wear measurement brush and power supply brush different from the state of wear amount of detected wear measurement brush.Therefore, can accurately measure the contact condition of power supply brush and motor commutator, and according to the state of wear of the brush of powering accurately estimate to power life-span of brush.
Description of drawings
Can be by detailed description to purpose of the present invention below in conjunction with accompanying drawing, feature and advantage have clearer understanding.
Fig. 1 is the commutator of motor of present embodiment and the schematic diagram of formation of power supply brush.
Fig. 2 shows that the electricity of the device for judging brush state of motor of present embodiment constitutes.
Fig. 3 is the block diagram of function that shows the ECU of present embodiment.
Fig. 4 shows the negative electrode brush, the wear extent of high rotating speed brush and slow-speed of revolution brush and machine operation time relation.
Fig. 5 shows a formation that changes the commutator and the power supply brush of routine motor as present embodiment.
Embodiment
Followingly specific embodiments of the invention are elaborated with reference to accompanying drawing.
The motor of present embodiment is double mode direct current motor, and promptly it can switch high rotating speed pattern and slow-speed of revolution pattern as required.This motor is applied in the various devices.Such as, in vehicle, this motor is well suited for being used to drive wiper, perhaps drive controlling brake gear.This drive controlling brake gear produces suitable braking force by producing predetermined hydraulic pressure.Below, be example explanation present embodiment with the device for judging brush state of motor in the direct current machine of drive controlling brake gear.
Fig. 1 is the commutator of motor M of present embodiment and the schematic diagram of formation of power supply brush.
As shown in Figure 1, motor M comprises the commutator 12 that together rotates with armature coil (not shown), and contacts with commutator 12, and the power supply brush 14,16,18 of electric current is provided for commutator 12, wherein, power supply brush 14 is the negative electrode brush, and power supply brush 16,18 is the anode brush.Anode brush 16 is high rotating speed brush, that is, when armature coil and commutator 12 rotated under high rotating speed pattern, anode brush 16 and negative electrode brush 14 provided electric current for armature coil and commutator 12.Anode brush 18 is slow-speed of revolution brush, that is, when armature coil and commutator 12 rotated under slow-speed of revolution pattern, anode brush 18 and negative electrode brush 14 provided electric current for armature coil and commutator 12.It is on the certain angle position at center that negative electrode brush 14, high rotating speed brush 16 and slow-speed of revolution brush 18 are positioned in commutator 12.As shown in Figure 1, the contact position of negative electrode brush 14 and high rotating speed brush 16 and commutator 12 is about being formed centrally a phase angle θ in the commutator 12
1, the contact position of negative electrode brush 14 and slow-speed of revolution brush 18 and commutator 12 is about being formed centrally a phase angle θ in the commutator 12
2θ
1And θ
2Size be the factor of rotating drive state of the commutator 12 of decision armature coil.
The negative electrode brush 14 that contacts with commutator 12, high rotating speed brush 16 and slow-speed of revolution brush 18 can produce wearing and tearing because of the rotation of commutator 12.In the present embodiment, negative electrode brush 14, high rotating speed brush 16 and slow-speed of revolution brush 18 satisfy following condition, it is rotation wear extent that the rotation wear extent of high rotating speed brush 16 is led over negative electrode brush 14 and slow-speed of revolution brush 18 wear extent (such as, the tear-to-wear allowance of length direction) that reaches capacity earlier.Specifically, can regulate the various factors that may influence the wear of brush amount, always lead over the rotation wear extent of negative electrode brush 14 and slow-speed of revolution brush 18 with the rotation wear extent that guarantees high rotating speed brush 16.Such as, can regulate the sectional area of the brush that contacts with commutator 12, the length of the brushes that can effectively contact with commutator 12, brush is to commutator 12 applied pressures, the resistance value of brush unit length is (promptly than resistance value, it influences current density), heating temp when perhaps motor M is worked or the like.
In addition, negative electrode brush 14, high rotating speed brush 16 and slow-speed of revolution brush 18 also satisfy following condition, and promptly the rotation wear extent of negative electrode brush 14 lags behind the wear extent that reaches capacity after the rotation wear extent of high rotating speed brush 16 and slow-speed of revolution brush 18.
As follows, high rotating speed brush 16 promptly is the part of power supply brush of the present invention, and the function of wear measurement brush is also arranged simultaneously, and promptly it can measure the wear extent of brush.
Fig. 2 shows that the electricity of the device for judging brush state of motor of present embodiment constitutes.Fig. 2 has only shown and the relevant part of state of wear of judging power supply brush 14,16,18.
The device for judging brush state of motor that Fig. 2 shows comprises the high rotating speed joint B1 that electric current is provided to the high rotating speed brush 16 of motor M, the slow-speed of revolution joint B2 that electric current is provided for the slow-speed of revolution brush 18 of motor M, and the motor that links to each other with potentiometer rotation test splice MTT.High rotating speed joint B1 links to each other with high rotating speed brush 16 by coil L, and slow-speed of revolution joint B2 links to each other with slow-speed of revolution brush 18.Motor rotates test splice MTT and links to each other with high rotating speed brush 16 by resistance R 1, links to each other with slow-speed of revolution brush 18 by resistance R 2.Negative electrode brush 14 is grounded.A capacitor C 1 is arranged between high rotating speed joint B1 and the ground, a capacitor C 2 is arranged between slow-speed of revolution joint B2 and the ground.Such as, capacitor C 1, C2 are made of capacitor.
Element in the above electricity loop respectively has predetermined characteristics.Such as, capacitor C 1, C2 and coil L have the function of removing electromagnetic noise and making the circuit steady operation among Fig. 2.Specifically, capacitor C 1 or C2 have the function that suppresses the high-frequency noise in the electric current.When being superimposed with on the electric current when changing excessive composition, the function that coil L has resistance suppresses the influence that change in voltage produces.
In addition, resistance R 1, the resistance value of R2 is bigger than the internal resistance of motor, rotates short circuit between the test splice MTT to prevent high rotating speed joint B1 or slow-speed of revolution joint B2 and motor, prevents that also excessive reverse current from flowing through motor and rotating test splice MTT.
Have the switching device (not shown) of connecting and cutting off the electric current supply function and be connected respectively to high rotating speed joint B1 and slow-speed of revolution joint B2, and this rotation mode according to motor is controlled this switching device.
Potentiometer is measured the voltage on the motor rotation test splice MTT, and sends measurement result to electronic-controlled installation (hereinafter to be referred as " ECU ").
Fig. 3 is the block diagram that shows ECU 24 functions of present embodiment.Fig. 3 has only shown and the relevant part of state of wear of judging power supply brush 14,16,18.
ECU 24 comprises tear-to-wear allowance test section 26, state of wear detection unit 28 and alarm operation detection unit 30.Tear-to-wear allowance test section 26 detects the wear extent of rotating the high rotating speed brush 16 that produces owing to commutator 12 and whether has reached tear-to-wear allowance according to the measurement result of potentiometer 25.State of wear detection unit 28 is judged the state of wear of power supply brush 14,16 or 18 according to the testing result of tear-to-wear allowance test section 26.Alert action detection unit 30 judges whether to start warning device according to the result of determination of state of wear detection unit 28.
According to the measurement result of potentiometer 25, specifically, rotate the variation of the voltage on the test splice MTT according to motor, tear-to-wear allowance test section 26 detects whether normal rotation of armature coils and commutator 12.When armature coil and commutator 12 did not have normal rotation, tear-to-wear allowance test section 26 judged that the wear extent of high rotating speed brush 16 has reached tear-to-wear allowance.
When the wear extent that detects high rotating speed brush 16 when tear-to-wear allowance test section 26 had reached tear-to-wear allowance, state of wear detection unit 28 judged that the wear extent of slow-speed of revolution brushes 18 is near tear-to-wear allowance.
The wear extent of judging slow-speed of revolution brushes 18 when state of wear detection unit 28 is during near tear-to-wear allowance, alert action detection unit 30 starting warning devices, and the sound or show the alarm picture of giving the alarm is noted to remind the driver.
The following describes the operation principle of the device for judging brush state of motor of present embodiment.
When motor M was rotated under high rotating speed pattern, high speed anode brush 16 and negative electrode brush 14 provided electric current for commutator 12.That is, in Fig. 2, electric current by coil L and high rotating speed brush 16, is transferred to armature coil and commutator 12 from high rotating speed joint B1, flows to earth terminal GND from negative electrode brush 14 again.
No matter in high rotating speed pattern or under slow-speed of revolution pattern, negative electrode brush 14, high rotating speed brush 16 all are crushed on the commutator 12 with slow-speed of revolution brush 18 and contact with commutator 12, so, when motor M was rotated, negative electrode brush 14, high rotating speed brush 16 and slow-speed of revolution brush 18 all can wear and tear gradually because of the rotation of commutator 12.
Fig. 4 shows the relation of the operating time of the wear extent of negative electrode brush 14, high rotating speed brush 16 and slow-speed of revolution brush 18 and motor M.
As shown in Figure 4, the wear extent of high rotating speed brush 16 is always greater than the wear extent of slow-speed of revolution brush 18, and the wear extent of the wear extent of high rotating speed brush 16 and slow-speed of revolution brush 18 is always greater than the wear extent of negative electrode brush 14.As mentioned above, negative electrode brush 14, high rotating speed brush 16 and slow-speed of revolution brush 18 constitute requiring to satisfy under this condition.So high rotating speed brush 16 is led over slow-speed of revolution brush 18 and negative electrode brush 14 wear extent that reaches capacity earlier, the wear extent and negative electrode brush 14 reaches capacity at last.Therefore, when the wear extent of high rotating speed brush 16 has reached tear-to-wear allowance, can infer slow-speed of revolution brush 18 wear extent that do not reach capacity as yet, but near tear-to-wear allowance.
In the present embodiment, the judgement of high rotating speed brush 16 state of wear is that of Vehicular system initial examination and measurement thes contents are as follows and carries out when starting as vehicular electric machine.
At first, the switching device (not shown) that is connected with high rotating speed joint B1 (Fig. 2) is placed on-state, simultaneously, the switching device (not shown) that is connected with slow-speed of revolution joint B2 (Fig. 2) is placed off-state, be provided for armature coil and commutator 12 by high speed anode brush 16 and negative electrode brush 14 electric currents.
When the wear extent of high rotating speed brush 16 did not reach capacity wear extent as yet, when high speed anode brush 16 and commutator 12 kept good contact condition, motor rotates test splice MTT, and to go up the variation of voltage as described below.
Moment after switching device (it is connected with high rotating speed joint B1) is placed on-state, armature coil and commutator 12 do not begin to rotate as yet, do not produce inverse electromotive force on the motor M as yet.Therefore, motor rotates the current potential current potential closely on the test splice MTT.Then, along with electric current flows through high rotating speed joint B1, motor M and earth terminal GND gradually, armature coil and commutator 12 begin to rotate gradually, produce the stable inverse electromotive force corresponding to the armature coil rotary state on the motor M.Along with the increase of the inverse electromotive force that produces on the motor M, the current potential that motor rotates on the test splice MTT rises gradually from earth potential.
On the other hand, reached tear-to-wear allowance in the wear extent of high rotating speed brush 16, when high speed anode brush 16 and commutator 12 were not in good state of contact, motor rotates test splice MTT, and to go up the variation of voltage as described below.
Moment after switching device is placed on-state, with last identical, armature coil and commutator 12 do not begin to rotate as yet, do not produce inverse electromotive force on the motor M as yet.Therefore, motor rotates the current potential current potential closely on the test splice MTT.Then, because high speed anode brush 16 is not in good state of contact with commutator 12, electric current can not normally flow between high rotating speed joint B1, motor M and earth terminal GND.So the armature coil of motor M and commutator 12 can not stable rotation, on the motor M or do not produce inverse electromotive force, even it is also very unstable perhaps to have produced this inverse electromotive force of inverse electromotive force.That is, the test splice of motor rotation at this moment MTT is different when upward the feature of potential change well contacts with commutator 12 with high speed anode brush 16.
Present embodiment according to above explanation, by being provided with the rate of wear of negative electrode brush 14, high rotating speed brush 16 and slow-speed of revolution brush 18 obviously differently, and set the priority of wearing and tearing, can infer the state of wear that other brushes from the state of wear of the fast brush of the rate of wear.Specifically, when the wear extent of the fast high rotating speed brush 16 of the rate of wear has reached tear-to-wear allowance, can infer that slow-speed of revolution brush 18 and negative electrode brush 14 still keep and the good contact condition of commutator 12, but the wear extent of slow-speed of revolution brush 18 is near tear-to-wear allowance.
Therefore,, can correctly judge the contact condition of slow-speed of revolution brush 18 and commutator 12, accurately infer the state of wear of slow-speed of revolution brush 18 according to present embodiment.Particularly, owing to judge the state of wear of power supply brush before can not continuing to keep at the good contact condition of power supply brush and commutator 12, so can keep the rotating property of motor M effectively.
Because the device for judging brush state of motor of present embodiment is made of the existing brush of combination, thus realize easily, simple in structure.
Because the high rotating speed brush 16 in two anode brushes is judged brush as state of wear, so, even when the wear extent of high rotating speed brush 16 has reached tear-to-wear allowance, the slow-speed of revolution brush 18 in the anode brush still keeps the good contact condition with commutator 12.Therefore,, and when motor M is in common driving condition, provide electric current, can effectively guarantee the rotating property of motor M with slow-speed of revolution brush 18 and negative electrode brush 14 if with the brush of slow-speed of revolution brush 18 as the main power source system.
Compare with slow-speed of revolution brush 18, electromagnetic noise such as easier flashing between high rotating speed brush 16 and the commutator 12, this can accelerate the wearing and tearing of high rotating speed brush 16.So high rotating speed brush 16 satisfies the fast requirement of the rate of wear, be well suited for being used as state of wear and judge brush.
Because the rate of wear of the negative electrode brush 14 in the power supply brush 14,16,18 is set the most slowly, so, even, also can guarantee the negative electrode brush 14 of ground connection and the good contact condition between the commutator 12 just in case high rotating speed brush 16 and slow-speed of revolution brush 18 boths have reached tear-to-wear allowance.So, flowing into motor M outside the electric current expectation even have, this electric current also can flow into GND by negative electrode brush 14, it is hereby ensured the fail safe of device.
Below one of the explanation present embodiment changes example.
High rotating speed brush 16 in above embodiment in the power supply brush 14,16,18 is used as state of wear and is judged brush, and still, state of wear judges that brush also can be independent of the power supply brush.
Fig. 5 shows a formation that changes the commutator and the power supply brush of routine motor M as present embodiment.
As shown in Figure 5, the power supply brush comprises a pair of brush, i.e. negative electrode brush 14 and anode brush 16, and the motor in this example is the monotype direct current machine in other words.
The inspection brush 32 of judging brush as state of wear contacts with commutator 12.It is on the certain angle position at center that negative electrode brush 14, anode brush 16 and inspection brush 32 are positioned in commutator 12.As shown in Figure 5, the contact position of negative electrode brush 14 and anode brush 16 and commutator 12 is about being formed centrally a phase angle θ 4 in the commutator 12, the contact position of negative electrode brush 14 and inspection brush 32 and commutator 12 is about being formed centrally a phase angle θ 3 in the commutator 12.
In the present embodiment, negative electrode brush 14, anode brush 16 and check that brush 32 satisfies following condition, the rotation wear extent that the rotation wear extent of promptly checking brush 32 is led over negative electrode brush 14 and anode brush 16 wear extent that reaches capacity earlier.Specifically, check the rotation wear extent of the rotation wear extent of brush 32, so the rotation wear extent of inspection brush 32 is always led over the rotation wear extent of anode brush 16 greater than anode brush 16.In addition, negative electrode brush 14, anode brush 16 and check that brush 32 also satisfies following condition, wear extent reaches capacity after promptly the rotation wear extent of negative electrode brush 14 lags behind anode brush 16 and checks the rotation wear extent of brush 32.
In this routine monotype direct current machine M, because the inspection brush 32 of judging brush as state of wear is than power supply brushes 14,16 wear extent that reaches capacity earlier, so,, can accurately infer the state of wear of power supply brush 14,16 according to the wear extent of checking brush 32 wear extent that whether reaches capacity.
With above-mentioned the same, can judge according to the potential change on the motor M (its variation with the inverse electromotive force that produces on the motor M changes) and check whether brush 32 keeps the excellent electric contact state with commutator 12.Then, the tear-to-wear allowance test section 26 of ECU 24 detects whether normal rotation of armature coils and commutator 12.When armature coil and commutator 12 did not have normal rotation, tear-to-wear allowance test section 26 judged that the wear extent of checking brushes 32 has reached tear-to-wear allowance.When tear-to-wear allowance test section 26 detected the wear extent of checking brush 32 and reached tear-to-wear allowance, the wear extent that state of wear detection unit 28 is judged anode brushes 16 was near tear-to-wear allowance, then alert action detection unit 30 starting warning devices.
According to the variation example of above explanation, can accurately infer the state of wear that power supply brush 14,16 by the state of wear of checking brush 32.Specifically, when the wear extent of inspection brush 32 has reached tear-to-wear allowance, can infer that anode brush 16 still keeps and the good contact condition of commutator 12, but its wear extent is near tear-to-wear allowance.
Because the device for judging brush state of motor of present embodiment is made of the existing brush of combination, so realize easily structure that also can simplification device.
Below only illustrated it is the preferred embodiments of the present invention, the present invention is not limited to above embodiment, and belonging to those skilled in the technology concerned can do various modifications under the prerequisite that does not depart from the scope of the present invention.
Such as, in above embodiment, judge that power supply wear of brush state is that a content of Vehicular system initial examination and measurement when starting as vehicular electric machine is carried out.The present invention is not limited to this situation, such as, also can judge power supply wear of brush state according to vehicle driver's indication.
Judge that state of wear judges that whether reached capacity the method for wear extent of the wear extent of brush also is not limited to method in the above example.Such as, can detect the variation of judging the resistance value that the wear extent of brush is corresponding with state of wear, infer that according to this detected value state of wear judges the wear extent of brush again, the wear extent of the judging state of wear judgement brush wear extent that whether reached capacity.For another example, can make state of wear judge that brush resistance when soon reaching capacity wear extent uprushes, judge the wear extent of brush again according to this change-detection state of wear of resistance, the wear extent of the judging state of wear judgement brush wear extent that whether reached capacity.
Be to judge that with ECU 24 state of wear judges the wear extent of the brush wear extent that whether reached capacity in above example, and judge the state of wear of power supply brush.But the present invention is not limited to this situation, can use as long as can reach predetermined purpose any way.Such as, can use bulb and related circuit, and set, judge the wear extent of the brush wear extent that reached capacity when state of wear, in the time of can not continuing to keep the good contact condition with commutator 12, light this bulb.So also can detect state of wear and judge the wear extent of the brush wear extent that whether reached capacity, and notify the vehicle driver.
Claims (9)
1. device for judging brush state of motor comprises:
Rotating commutator,
The power supply brush, it contacts with described commutator, electric current is provided for described commutator,
The wear measurement brush, it contacts with described commutator, and the wearing character of the described wear measurement brush that produces when described commutator rotates is different with the wearing character of described power supply brush, and
The abrasion detection unit, it detects the quantity of state of the wearing and tearing of the described wear measurement brush that produces when described commutator rotates.
2. device for judging brush state of motor according to claim 1, wherein,
Because the wearing and tearing that produce during the rotation of described commutator, described wear measurement brush is than the described power supply brush wear extent that reaches capacity earlier,
The wear extent that described abrasion detection unit the detects described wear measurement brush wear extent that whether reaches capacity.
3. device for judging brush state of motor according to claim 1 and 2 also comprises
The state of wear identifying unit, it judges the state of wear of described power supply brush according to the testing result of described abrasion detection unit.
4. device for judging brush state of motor according to claim 3, wherein
When the wear extent that detects described wear measurement brush when described abrasion detection unit had reached capacity wear extent, described state of wear identifying unit judged that the wear extent of described power supply brush is near tear-to-wear allowance.
5. according to the described device for judging brush state of motor of one of claim 1 to 4, wherein
Described wear measurement brush has the function of described power supply brush.
6. device for judging brush state of motor according to claim 5, wherein
Described power supply brush comprises anode brush and negative electrode brush,
Described wear measurement brush has the function of described anode brush.
7. device for judging brush state of motor according to claim 6, wherein
When rotating under described commutator is slowly running pattern, the anode brush of described power supply brush and negative electrode brush provide electric current for described commutator,
When described commutator rotates under the high speed rotating pattern, described wear measurement brush, and the negative electrode brush of described power supply brush provides electric current for described commutator.
8. a device for judging brush state of motor is used for judging in the motor state of wear that contacts with commutator, the power supply brush of electric current also is provided to described commutator, comprising:
The wear measurement brush, it contacts with described commutator, and the wearing character of the described wear measurement brush that produces when described commutator rotates is different with the wearing character of described power supply brush, and
The abrasion detection unit, it detects the quantity of state of the wearing and tearing of the described wear measurement brush that produces when described commutator rotates.
9. motor comprises:
Rotating commutator,
The power supply brush, it contacts with described commutator, electric current is provided for described commutator,
The wear measurement brush, it contacts with described commutator, and the wearing character of the described wear measurement brush that produces when described commutator rotates is different with the wearing character of described power supply brush, and
The abrasion detection unit, it detects the quantity of state of the wearing and tearing of the described wear measurement brush that produces when described commutator rotates.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004108036A JP4380393B2 (en) | 2004-03-31 | 2004-03-31 | Brush state judgment device for motor |
| JP108036/2004 | 2004-03-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1677802A CN1677802A (en) | 2005-10-05 |
| CN1319251C true CN1319251C (en) | 2007-05-30 |
Family
ID=35050168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100588207A Expired - Fee Related CN1319251C (en) | 2004-03-31 | 2005-03-28 | Device for judging brush state of motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4380393B2 (en) |
| CN (1) | CN1319251C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2112518A1 (en) * | 2008-04-25 | 2009-10-28 | ALSTOM Technology Ltd | Brush wear monitor |
| DE102010040525A1 (en) * | 2010-09-09 | 2012-03-15 | Robert Bosch Gmbh | Device and method for monitoring the wear of a brush of a commutator system in an electrical machine |
| JP6069815B2 (en) | 2011-02-16 | 2017-02-01 | 日産自動車株式会社 | Idle stop control device |
| CN104577991B (en) * | 2015-02-13 | 2018-01-12 | 苏州百微成智能科技有限公司 | Possesses the exchange intelligent switch of multi-protective function |
| CN105337134B (en) * | 2015-12-01 | 2017-12-01 | 南京钢铁股份有限公司 | A kind of carbon brush of direct current motor for checking the life-span |
| WO2018014147A1 (en) * | 2016-07-19 | 2018-01-25 | 黄继林 | Brush current control system, and brush current intelligent control system and control method |
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| JPS6082043A (en) * | 1983-10-05 | 1985-05-10 | Matsushita Electric Ind Co Ltd | Brush wear warning device for dc motor |
| CN1049250A (en) * | 1989-08-03 | 1991-02-13 | 西屋电气公司 | Utilize the improved carboloy holder of wear of brush detector |
| CN2083795U (en) * | 1990-11-29 | 1991-08-28 | 张秀英 | Alarm electric brush |
| CN2112217U (en) * | 1991-11-25 | 1992-08-05 | 海门县电碳厂 | Safety electric brush |
| JP2002369460A (en) * | 2001-06-06 | 2002-12-20 | Bosch Automotive Systems Corp | Permanent magnet dc motor and motor-driven speed changer operation device |
| JP2003125561A (en) * | 2001-10-15 | 2003-04-25 | Minebea Co Ltd | Dynamo-electric machine brush with wear recognition line |
| CN1426156A (en) * | 2001-12-11 | 2003-06-25 | 三菱电机株式会社 | AC generator for vehicle and its electric brush wearout detection system |
| JP2003319616A (en) * | 2002-04-24 | 2003-11-07 | Yuji Akiyama | Semiconductor control motor with mechanical sensor |
-
2004
- 2004-03-31 JP JP2004108036A patent/JP4380393B2/en not_active Expired - Fee Related
-
2005
- 2005-03-28 CN CNB2005100588207A patent/CN1319251C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6082043A (en) * | 1983-10-05 | 1985-05-10 | Matsushita Electric Ind Co Ltd | Brush wear warning device for dc motor |
| CN1049250A (en) * | 1989-08-03 | 1991-02-13 | 西屋电气公司 | Utilize the improved carboloy holder of wear of brush detector |
| CN2083795U (en) * | 1990-11-29 | 1991-08-28 | 张秀英 | Alarm electric brush |
| CN2112217U (en) * | 1991-11-25 | 1992-08-05 | 海门县电碳厂 | Safety electric brush |
| JP2002369460A (en) * | 2001-06-06 | 2002-12-20 | Bosch Automotive Systems Corp | Permanent magnet dc motor and motor-driven speed changer operation device |
| JP2003125561A (en) * | 2001-10-15 | 2003-04-25 | Minebea Co Ltd | Dynamo-electric machine brush with wear recognition line |
| CN1426156A (en) * | 2001-12-11 | 2003-06-25 | 三菱电机株式会社 | AC generator for vehicle and its electric brush wearout detection system |
| JP2003319616A (en) * | 2002-04-24 | 2003-11-07 | Yuji Akiyama | Semiconductor control motor with mechanical sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1677802A (en) | 2005-10-05 |
| JP2005295704A (en) | 2005-10-20 |
| JP4380393B2 (en) | 2009-12-09 |
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