CN206671497U - A kind of device for measurement motor torque pulsation - Google Patents
A kind of device for measurement motor torque pulsation Download PDFInfo
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- CN206671497U CN206671497U CN201621142198.8U CN201621142198U CN206671497U CN 206671497 U CN206671497 U CN 206671497U CN 201621142198 U CN201621142198 U CN 201621142198U CN 206671497 U CN206671497 U CN 206671497U
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Abstract
A kind of device for measurement motor torque pulsation is the utility model is related to, the measurement apparatus includes：Tested motor, encoder, shaping circuit, frequency dividing circuit, multicircuit switch, frequency-voltage conversion circuit, amplifying circuit, filter circuit, signalling channel selection circuit, protection circuit, data acquisition circuit and host computer platform.When motor is run under different rotating speeds, the measurement apparatus can realize the torque pulsation measurement in motor operation course.
Description
Technical field
It the utility model is related to the measurement apparatus of technical field of motors, particularly motor torque ripple.
Background technology
The motor torque ripple as caused by electric machine structure and control, limits motor in the high performance occasion such as servo-drive
Using.The research of motor torque ripple is constantly subjected to the concern of people, realizes that the motor torque ripple of wide speed range operation is surveyed
Amount is to analyze torque pulsation producing cause, judge torque pulsation size and study the important evidence for reducing torque pulsation method.Cause
This, how the torque pulsation of measurement motor wide speed range operation becomes a urgent problem to be solved.
The content of the invention
In order to solve the above problems, the utility model provides a kind of device for measurement motor torque pulsation, and it is special
Sign is that the measurement apparatus includes：Tested motor, encoder, shaping circuit, frequency dividing circuit, multicircuit switch, frequency electricity
Voltage conversion circuit, amplifying circuit, filter circuit, protection circuit, signalling channel selection circuit, data acquisition circuit and host computer are put down
Platform；Wherein,
The encoder and tested motor are coaxially connected, and encoder sends the pulse letter directly proportional to tested motor rotating speed
Number；
The shaping circuit is connected with encoder, and the pulse signal that shaping circuit exports to encoder is carried out at shaping
Reason；
The frequency dividing circuit is connected with shaping circuit, and frequency dividing circuit is dropped according to rotating speed height using different divide ratios
The frequency of low encoder output pulse signal, it is easy to the measurement of torque pulsation；
The one 4 road change-over switch (7) is connected with frequency dividing circuit, and multicircuit switch can realize different rotating speeds section
Division, improve the precision of measurement；
The frequency-voltage conversion circuit and the one 4 road change-over switch (7), frequency-voltage conversion circuit is by certain frequency
Pulse signal is converted into the analog voltage signal directly proportional to pulse frequency；
The 2nd 4 road change-over switch (9) is connected with frequency-voltage conversion circuit, and multicircuit switch can realize difference
The division of speed stage, improve the precision of measurement；
The amplifying circuit is connected with the 2nd 4 road change-over switch (9), and each amplifying circuit is to the 2nd 4 road change-over switch (9)
The analog voltage of output is amplified processing；
The filter circuit is connected with amplifying circuit, and filter circuit realizes the filtering process of voltage signal；
The protection circuit is connected with filter circuit, and device measures rotation under maximum divide ratio when switch closes
Motor, realize the protection of measurement apparatus；
The signalling channel selection circuit and the analog voltage u of filter circuit outputoTo input, by multicircuit switch
Judge signal A1A0It is sent to the one 4 road change-over switch (7) and the 2nd 4 road change-over switch (9)；
The data acquisition circuit is connected with filter circuit, the simulation electricity of data acquisition circuit collection reflection motor speed
Pressure, and it is transferred to host computer platform；
The host computer platform is connected with data acquisition circuit, and host computer platform will reflect the analog voltage of speed ripple
Torque pulsation is calculated as, and the torque pulsation data are shown and stored.
Different rotating speeds section is realized by frequency dividing circuit, multicircuit switch, amplifying circuit and signalling channel selection circuit
Division and corresponding rotating speed torque pulsation measure so that device can measurement motor wide speed range operation when torque pulsation；
Motor speed is divided into 4 sections using 4 road change-over switches, the rotating speed of tested motor (1) is divided into low speed segment (0~1/8nmax), in
Fast section (1/8nmax~1/4nmax), high regime (1/4nmax~1/2nmax) and ultrahigh speed section (1/2nmax~nmax)；Wherein, superelevation
Fast segment signal passage is opened by 8 frequency dividing circuits, the D0 of the one 4 road change-over switch (7), frequency-voltage conversion circuit, the conversion of the 2nd 4 tunnel
Close D0,8 times of amplifying circuits, filter circuit and the signalling channel selection circuit composition of (9)；High regime signalling channel is by 4 frequency dividing electricity
Road, the D1 of the one 4 road change-over switch (7), frequency-voltage conversion circuit, the D1 of the 2nd 4 road change-over switch (9), 4 times of amplification electricity
Road, filter circuit and signalling channel selection circuit composition；Middling speed segment signal passage is by 2 frequency dividing circuits, the one 4 road change-over switch
(7) D2, frequency-voltage conversion circuit, the D2 of the 2nd 4 road change-over switch (9), 2 times of amplifying circuits, filter circuit and signal leads to
Road selection circuit composition；Low speed segment signalling channel is by the D3 of the one 4 road change-over switch (7), frequency-voltage conversion circuit, the 2nd 4
D3, filter circuit and the signalling channel selection circuit composition of road change-over switch (9).
The signalling channel selection circuit forms by comparator, with door, NOT gate, OR gate and voltage set-point；Wherein voltage
uoFor the analog voltage of filter circuit output, umaxFor motor maximum speed when corresponding magnitude of voltage, A1A0For 4 road change-over switches
Judge signal；The reverse input end of first comparator (15) is the analog voltage u of outputo, positive input is given voltage value
1/4umax；The reverse input end of second comparator (17) is the analog voltage u of outputo, positive input is given voltage value 1/
2umax；The reverse input end of 3rd comparator (18) is the analog voltage u of outputo, positive input is given voltage value 1/
8umax；The input of NOT gate (16) is connected with the output end of first comparator (15)；First with the input of door (19) and the
The output end of two comparators (17) is connected with the output end of NOT gate (16)；Second with the input and first comparator of door (20)
(15) output end is connected with the output end of the 3rd comparator (18)；The input of OR gate (21) is defeated with door (19) with first
Go out end and second with the output end of door (20) to be connected；The output end of first comparator (15) is connected with pull-up resistor, and second
The output end of comparator (17) is connected with pull-up resistor, and the output end of the 3rd comparator (18) is connected with pull-up resistor；The
The output end of one comparator (15) and the judgement signal A of change-over switch1It is connected, the output end and change-over switch of OR gate (21)
Judgement signal A0It is connected.
The protection circuit is made up of switch and given voltage value；Before the motor of measurement rotation, closure switch are then defeated
The analog voltage u gone outo=umax, the judgement signal of change-over switch is forced to A1A0=00, make device in the letter of maximum divide ratio
Measurement motor torque pulsation in number passage, and then protection device；In motor operation course, switch is disconnected, makes device certainly
Dynamic selection signal passage, and then improve measurement accuracy.
Torque pulsation and the relational expression Δ T of speed ripplee=2 π J/60 Δ t Δ n, its derivation are as follows：By the machinery of motor
Equation of motion Te=Jd ω/dt+D ω+TlKnow, in motor steady-state operation, if time interval Δ t is sufficiently small, apparent load turns
Square TlIt is invariable with D ω, obtain motor torque ripple Δ Te, rotor angle of electric machine velocity variable Δ ω and motor rotation be used to
Amount J meets Δ Te=J/ Δ t Δ ω, and according to the π n/60 of ω=2, can obtain motor torque ripple and speed ripple meets Δ Te=
2πJ/60ΔtΔn。
Divide ratio α should not select that the precision of measurement device too greatly, otherwise can be influenceed.
2 tunnels, 8 tunnels, 16 tunnels also can be selected even more by taking 4 road change-over switches as an example in multicircuit switch of the present utility model
More change-over switches, its design principle are consistent with 4 road change-over switches.
When rotating speed frequent fluctuation by a small margin between two kinds of different rotating speeds scopes, the frequent of selection of speed module is easily caused
Selection so that measurement error becomes big, to avoid the generation of such case, introduces rotating speed sluggishness link.
Voltage matches circuit should be included in data acquisition circuit, to prevent the analog voltage of output from exceeding its upper voltage limit
Value.
During motor stable speed operation, the analog voltage that the pulse signal of encoder output obtains after voltage to frequency is changed includes
Average voltage and voltage variety, average voltage can reflect the mean speed of motor, and voltage variety can reflect motor
Speed ripple, the measurement of motor speed pulsation and torque pulsation is realized by measuring voltage variety.
The beneficial effects of the utility model are：The utility model uses areal survey and voltage to frequency switch technology, can be real
The measurement of torque pulsation during existing motor wide speed range operation, reduce torque pulsation for research and effective scientific method is provided.
Brief description of the drawings
Fig. 1 is apparatus structure schematic diagram of the present utility model；
Fig. 2 is rotating speed sluggishness link.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings：
As shown in figure 1,1- tested motors, 2- encoders, 3- shaping circuits, 4-8 frequency dividing circuits, 5-4 frequency dividing circuits, 6-2
Frequency dividing circuit, the road change-over switches of 7- the 1st, 8- frequency-voltage conversion circuits, the road change-over switches of 9- the 2nd 4,10-8 times amplify electricity
Road, 11-4 times of amplifying circuit, 12-2 times of amplifying circuit, 13- filter circuits, 14- switching devices, 15- first comparators, 16- are non-
Door, the comparators of 17- second, the comparators of 18- the 3rd, 19- first and door, 20- second and door, 21- OR gates, 22- data acquisitions electricity
Road, 23- host computer platforms, 24- frequency dividing circuits, 25- amplifying circuits, 26- protection circuits, 27- signalling channel selection circuits.
Including tested motor, encoder, each integrated chip and circuit components used in the utility model can lead to
Market acquisition is crossed, such as tested motor can use switched reluctance motor, encoder can use absolute type encoder, voltage to frequency
The chips such as LM2907 can be used in conversion chip, and change-over switch can use the chips such as CD4051.
The utility model improves the measurement accuracy of device by automatically selecting suitable signalling channel.Motor operation course
In, work as 1/2nmax＜ n≤nmaxWhen, judge signal A1A0=00, measure torque pulsation in the signalling channel of ultrahigh speed section；When 1/
4nmax＜ n ＜ 1/2nmaxWhen, judge signal A1A0=01, measure torque pulsation in the signalling channel of high regime；Work as 1/8nmax＜ n
＜ 1/4nmaxWhen, judge signal A1A0=10, measure torque pulsation in the signalling channel of middling speed section；As 0 ＜ n ＜ 1/8nmaxWhen,
Judge signal A1A0=11, measure torque pulsation in the signalling channel of low speed segment.
Rotating speed sluggishness ring layout is as shown in Fig. 2 threshold voltage Uα=1/ α umax(α=1,2,4,8 ...), sluggish width
For Δ U, α is divide ratio, only when rotating speed rises to Uα+ Δ U, device are just switched to signalling channel 2, when rotating speed drops to Uα-
Δ U, device are just switched to signalling channel 1.Such as：The maximum speed of motor is 1600rpm, and the rotary speed area of division is respectively low
Fast section (0~200rpm), middling speed section (200~400rpm), high regime (400~800rpm) and ultrahigh speed section (800~
1600rpm).If 200 ± 5rpm of the fluctuation of speed of motor, when motor is rotated with 195rpm at the beginning, now device is in low speed segment
The torque pulsation of signalling channel measurement motor, only when the rotating speed of motor rises to 205rpm, device is just switched to middling speed section letter
Number passage；When motor is rotated with 205rpm at the beginning, now device middling speed segment signal channel measurement motor torque pulsation, only
There is the rotating speed when motor to drop to 195rpm, device is just switched to low speed segment signalling channel.The signalling channel of other threshold rotation rates
Selection can similarly obtain.
The utility model and embodiments thereof are described above content, and this describes no limitation, institute in accompanying drawing
What is shown is also one of embodiment of the present utility model.So if one of ordinary skill in the art is enlightened by it, not
In the case of departing from the utility model creation objective, the same item taken other form or each component layouts side of other forms
Formula, the technical scheme and embodiment similar to the technical scheme are designed without creativeness, all should be belonged to of the present utility model
Protection domain.
Claims (4)
1. a kind of device for measurement motor torque pulsation, it is characterised in that the measurement apparatus includes：Tested motor (1),
Encoder (2), shaping circuit (3), frequency dividing circuit (24), the one 4 road change-over switch (7), frequency-voltage conversion circuit (8),
24 road change-over switches (9), amplifying circuit (25), filter circuit (13), protection circuit (26), signalling channel selection circuit (27),
Data acquisition circuit (22) and host computer platform (23)；Wherein,
The encoder (2) and tested motor (1) are coaxially connected, and encoder (2) sends directly proportional to tested motor (1) rotating speed
Pulse signal；
The shaping circuit (3) is connected with encoder (2), and the pulse signal that shaping circuit (3) exports to encoder (2) is carried out
Shape correction；
The frequency dividing circuit (24) is connected with shaping circuit (3), and frequency dividing circuit (24) uses different frequency dividings according to rotating speed height
Coefficient reduces the frequency of encoder (2) output pulse signal, is easy to the measurement of torque pulsation；
The one 4 road change-over switch (7) is connected with frequency dividing circuit (24), and multicircuit switch can realize different rotating speeds section
Division, improve the precision of measurement；
The frequency-voltage conversion circuit (8) and the one 4 road change-over switch (7), frequency-voltage conversion circuit (8) is by certain frequency
Pulse signal be converted into the analog voltage signal directly proportional to pulse frequency；
The 2nd 4 road change-over switch (9) is connected with frequency-voltage conversion circuit (8), and multicircuit switch can realize difference
The division of speed stage, improve the precision of measurement；
The amplifying circuit (25) is connected with the 2nd 4 road change-over switch (9), and each amplifying circuit is to the 2nd 4 road change-over switch (9)
The analog voltage of output is amplified processing；
The filter circuit (13) is connected with amplifying circuit (25), and filter circuit (13) realizes the filtering process of voltage signal；
The protection circuit (26) is connected with filter circuit (13), and device is surveyed under maximum divide ratio when switch (14) closes
The motor of rotation is measured, realizes the protection of measurement apparatus；
The signalling channel selection circuit (27) and the analog voltage u of filter circuit (13) outputoFor input, multipath conversion is opened
The judgement signal A of pass1A0It is sent to the one 4 road change-over switch (7) and the 2nd 4 road change-over switch (9)；
The data acquisition circuit (22) is connected with filter circuit (13), data acquisition circuit (22) collection reflection motor speed
Analog voltage, and be transferred to host computer platform (23)；
The host computer platform (23) is connected with data acquisition circuit (22), and host computer platform (23) will reflect speed ripple
Analog voltage is calculated as torque pulsation, and the torque pulsation data are shown and stored.
A kind of 2. device for measurement motor torque pulsation according to claim 1, it is characterised in that：
It is different with signalling channel selection circuit (27) realization by frequency dividing circuit (24), multicircuit switch, amplifying circuit (25)
Speed stage division and corresponding rotating speed torque pulsation measure so that device can measurement motor wide speed range operation when turn
Square is pulsed；Motor speed is divided into 4 sections using 4 road change-over switches, the rotating speed of tested motor (1) is divided into low speed segment (0~1/
8nmax), middling speed section (1/8nmax~1/4nmax), high regime (1/4nmax~1/2nmax) and ultrahigh speed section (1/2nmax~nmax)；Its
In, ultrahigh speed segment signal passage by 8 frequency dividing circuits (4), the D0 of the one 4 road change-over switch (7), frequency-voltage conversion circuit (8),
The D0 of 2nd 4 road change-over switch (9), 8 times of amplifying circuits (10), filter circuit (13) and signalling channel selection circuit (27) group
Into；High regime signalling channel is by 4 frequency dividing circuits (5), the D1 of the one 4 road change-over switch (7), frequency-voltage conversion circuit (8),
The D1 of 24 road change-over switches (9), 4 times of amplifying circuits (11), filter circuit (13) and signalling channel selection circuit (27) composition；
Middling speed segment signal passage is by 2 frequency dividing circuits (6), the D2 of the one 4 road change-over switch (7), frequency-voltage conversion circuit (8), the 2nd 4
The D2 of road change-over switch (9), 2 times of amplifying circuits (12), filter circuit (13) and signalling channel selection circuit (27) composition；Low speed
Segment signal passage is by the D3 of the one 4 road change-over switch (7), frequency-voltage conversion circuit (8), the 2nd 4 road change-over switch (9)
D3, filter circuit (13) and signalling channel selection circuit (27) composition.
A kind of 3. device for measurement motor torque pulsation according to claim 1, it is characterised in that：
The signalling channel selection circuit (27) forms by comparator, with door, NOT gate, OR gate and voltage set-point；Wherein voltage uo
For the analog voltage of filter circuit (13) output, umaxFor motor maximum speed when corresponding magnitude of voltage, A1A0Opened for the conversion of 4 tunnels
The judgement signal of pass；The reverse input end of first comparator (15) is the analog voltage u of outputo, positive input is given electricity
Pressure value 1/4umax；The reverse input end of second comparator (17) is the analog voltage u of outputo, positive input is given voltage
Value 1/2umax；The reverse input end of 3rd comparator (18) is the analog voltage u of outputo, positive input is given voltage value
1/8umax；The input of NOT gate (16) is connected with the output end of first comparator (15)；First with the input of door (19) with
The output end of second comparator (17) is connected with the output end of NOT gate (16)；Second with the input of door (20) compared with first
The output end of device (15) is connected with the output end of the 3rd comparator (18)；The input of OR gate (21) and first is with door (19)
Output end and second is connected with the output end of door (20)；The output end of first comparator (15) is connected with pull-up resistor, the
The output end of two comparators (17) is connected with pull-up resistor, and the output end of the 3rd comparator (18) is connected with pull-up resistor；
The output end of first comparator (15) and the judgement signal A of change-over switch1It is connected, the output end and change-over switch of OR gate (21)
Judgement signal A0It is connected.
A kind of 4. device for measurement motor torque pulsation according to claim 1, it is characterised in that：
The protection circuit (26) is formed by switching (14) and given voltage value；Before the motor of measurement rotation, closure switch,
The analog voltage u then exportedo=umax, the judgement signal of change-over switch is forced to A1A0=00, make device in maximum divide ratio
Signalling channel in measurement motor torque pulsation, and then protection device；In motor operation course, switch is disconnected, makes dress
Automatic selecting signal passage is put, and then improves measurement accuracy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621142198.8U CN206671497U (en) | 2016-10-20 | 2016-10-20 | A kind of device for measurement motor torque pulsation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621142198.8U CN206671497U (en) | 2016-10-20 | 2016-10-20 | A kind of device for measurement motor torque pulsation |
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| Publication Number | Publication Date |
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| CN206671497U true CN206671497U (en) | 2017-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106569130A (en) * | 2016-10-20 | 2017-04-19 | 天津工业大学 | Device and method for measuring torque pulsation of motor |
-
2016
- 2016-10-20 CN CN201621142198.8U patent/CN206671497U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106569130A (en) * | 2016-10-20 | 2017-04-19 | 天津工业大学 | Device and method for measuring torque pulsation of motor |
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