CN111766006A - Motor torque measuring system - Google Patents
Motor torque measuring system Download PDFInfo
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- CN111766006A CN111766006A CN202010664628.7A CN202010664628A CN111766006A CN 111766006 A CN111766006 A CN 111766006A CN 202010664628 A CN202010664628 A CN 202010664628A CN 111766006 A CN111766006 A CN 111766006A
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- motor
- tested
- rigid shaft
- torque
- turntable
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/06—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving mechanical means for indicating
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- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a motor torque measuring system, comprising: the motor to be tested, the load motor, a power supply and a rack, wherein the rack is provided with two opposite end plates, a shell of the motor to be tested is rotatably connected with a rotating shaft of the motor to be tested, an end face of one end, back to the load motor, of the shell of the motor to be tested is fixedly connected with one end of a first rigid shaft, the other end of the first rigid shaft is rotatably connected with one end plate of the rack, a turntable is sleeved on the first rigid shaft, one ends of two pull wires are fixedly connected onto the circumferential surface of the turntable, the two pull wires are wound on the circumferential surface of the turntable, the other ends of the two pull wires respectively extend out of two opposite sides of the circumferential surface of the turntable, two sides of the first rigid shaft are respectively provided with a fixed column, each fixed column is connected with one end of each elastic. The system has high measurement precision, simple structure and low cost, and can be applied to the torque measurement of the motor rotating at high speed.
Description
Technical Field
The invention relates to the technical field of motor testing, in particular to a motor torque measuring system.
Background
The torque of the motor needs to be tested in the motor warehousing inspection. As shown in fig. 1 and 2, when the motor testing system of the prior art tests the torque of the motor, the power supply 104 is used for driving the motor 101 to be tested. The housing of the motor 101 to be tested and the housing of the load motor 102 are anchored, and therefore, the motor 101 to be tested is mounted onThe housing and the chassis of the load motor 102 are at rest relative to the viewer. The torque sensor 103 is located between the motor to be tested and the load motor, is connected to the rotor of the motor to be tested 101 through a coupling 105, is connected to the rotor of the load motor 102 through another coupling 106, and rotates together with the rotors of the motor to be tested 101 and the load motor 102. Two ends of the shaft of the motor 101 to be measured are respectively provided with a Bearing which is respectively marked as Bearing1 and Bearing 2. The torque sensor 103 has a shaft with bearings at each end, which are designated Bearing3 and Bearing 4. The load motor 102 has a Bearing at each end of its shaft, which is designated Bearing5 and Bearing 6. It should be understood that the bearings in fig. 2 are only schematic and do not represent actual positions, and the Bearing1 and the Bearing2 are taken as examples, and do not represent that the Bearing1 and the Bearing2 are both located at the output end of the motor 101 to be tested. Six bearings cannot be on a perfect straight line, and the six bearings can respectively consume certain torque and are respectively marked as TBearing1、TBearing2、TBearing3、TBearing4、TBearing5And TBearing6. In addition, the three shafts of the motor 101 to be measured, the load motor 102 and the torque sensor 103 must be connected by using the coupling 105 and the other coupling 106, the three shafts cannot be perfectly positioned on the same axis, the coupling 105 and the other coupling 106 must generate distortion and vibration during operation, and the irregular motions must consume certain torque, which is respectively marked as Tc1And Tc2. The electromagnetic torque of the motor 101 to be measured is denoted as TMagThe torque of the load motor 102 is denoted as TLoad. Then, the torque measured by the torque sensor 103 is as follows:
when the torque sensor 103 is used in a motor testing system with more than thirty thousand revolutions per minute, the system cost will greatly increase, the machining difficulty is greatly increased, and the interference loaded on the torque sensor 103 will be increased while the jitter and noise are increased, so that it is very difficult to obtain a stable torque signal.
Disclosure of Invention
The embodiment of the invention provides a motor torque measuring system, which aims to solve the problem that a stable torque signal is difficult to obtain under the condition of high-speed rotation of a motor in the prior art.
The embodiment of the invention discloses the following technical scheme:
a motor torque measurement system comprising: the device comprises a motor to be tested, a load motor, a power supply and a frame, wherein a rotating shaft of the motor to be tested is connected with a rotating shaft of the load motor, the power supply is used for driving the motor to be tested to rotate, the frame is provided with two opposite end plates, a shell of the motor to be tested is rotationally connected with the rotating shaft of the motor to be tested, the end surface of the shell of the motor to be tested, which is back to one end of the load motor, is fixedly connected with one end of a first rigid shaft, the other end of the first rigid shaft is rotationally connected with one end plate of the frame, a turntable is fixedly sleeved on the first rigid shaft, one ends of two pull wires are fixedly connected on the circumferential surface of the turntable, the two pull wires are wound on the circumferential surface of the turntable, the other ends of the two pull wires respectively extend out from two opposite sides of the circumferential surface of the turntable, two sides of, each fixing column is connected with one end of each elastic piece, and the other end of each elastic piece is connected with the other end of each pull wire; the end surface of one end, back to the motor to be tested, of the shell of the load motor is anchored with one end of a second rigid shaft, and the other end of the second rigid shaft is anchored with the other end plate of the rack; the first rigid shaft, the second rigid shaft, the rotating shaft of the motor to be tested and the rotating shaft of the load motor are all located on the same straight line.
Further: when the motor torque measuring system is used for measuring the torque of the motor to be measured, the first rigid shaft, the second rigid shaft, the rotating shaft of the motor to be measured and the rotating shaft of the load motor are all horizontally placed or vertically placed in the axial direction.
Further: the torque measured by the motor torque measuring system is the product of the acting force of the elastic part and the radius of the turntable.
Further, the motor torque measurement system measurement further includes: and the calibration assembly is used for calibrating the corresponding relation between the length of the elastic piece and the acting force.
Further, the calibration assembly includes: first calibration weight and third rigidity axle, first calibration weight is hung and is established the one end of third rigidity axle, the other end detachably of third rigidity axle connects the carousel, third rigidity axle level sets up.
Further, the calibration assembly includes: the second calibration weight, second calibration weight detachably articulates arbitrary on acting as go-between, just the second calibration weight with what the second calibration weight articulated act as go-between correspond the elastic component is located respectively the both sides of the periphery of carousel.
Further: when the corresponding relation of the length of the elastic part and the acting force is calibrated, the axial directions of the first rigid shaft, the second rigid shaft, the rotating shaft of the motor to be tested and the rotating shaft of the load motor are all in the horizontal direction.
Further: and when the corresponding relation between the length of the elastic piece and the acting force is calibrated, the motor to be tested and the load motor are kept static.
The motor torque measuring system provided by the embodiment of the invention can measure the torque of the motor to be measured by enabling the shell of the motor to be measured to rotate to cause the deformation of the elastic part, has the advantages of high measurement precision, simple system structure and lower cost, and can be applied to the torque measurement of the motor rotating at high speed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of a prior art motor torque measurement system;
FIG. 2 is a schematic connection diagram of a prior art motor torque measurement system;
FIG. 3 is a perspective view of a motor torque measurement system of an embodiment of the present invention;
FIG. 4 is a top view of a motor torque measurement system of an embodiment of the present invention;
FIG. 5 is a measurement simulation diagram simulating a prior art motor torque measurement device;
fig. 6 is a measurement simulation diagram of the motor torque measurement device of the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a motor torque measuring system. As shown in fig. 3 and 4, the motor torque measuring system includes: a motor 201 to be tested, a load motor 202, a power supply and a rack 203. The power supply is used for driving the motor 201 to be tested to rotate. The frame 203 has two opposite end plates. In addition, the chassis 203 may also have a floor. Both end plates are arranged on the bottom plate.
The rotating shaft of the motor 201 to be tested is connected with the rotating shaft of the load motor 202, that is, the output end of the motor 201 to be tested is connected with the input end of the load motor 202. In a specific embodiment, the rotating shaft of the motor 201 to be tested and the rotating shaft of the load motor 202 are connected through a coupling 204. It should be understood that bearings are arranged at two ends of the rotating shaft of the motor 201 to be tested, and bearings are also arranged at two ends of the load motor 202, and are respectively connected with end plates at two sides of the frame 203 through rigid shafts. The motor 201 to be tested and the load motor 202 are both conventional motors, and therefore, the structure of the motors is not described herein.
The casing of the motor 201 to be tested is rotatably connected to the rotating shaft of the motor 201 to be tested, so that the casing of the motor 201 to be tested can rotate. For example, the motor 201 to be tested may be a brushless motor. The end surface of the end of the casing of the motor 201 to be tested, which is opposite to the end of the load motor 202, is fixedly connected with one end of the first rigid shaft 205. The first rigid shaft 205 and the housing of the motor 201 to be measured may be integrally formed. The other end of the first rigid shaft 205 is rotatably connected to an end plate of the frame 203. Thus, after the motor 201 to be tested is started, the first rigid shaft 205 can rotate along with the housing of the motor 201 to be tested. It should be understood that two bearings are sleeved on the other end of the first rigid shaft 205, and the two bearings are respectively embedded on two opposite surfaces of an end plate of the frame 203.
A turntable 206 is fixedly mounted on the first rigid shaft 205. The turntable 206 and the first rigid shaft 205 are fixedly connected, for example, by being integrally formed, so that the turntable 206 can rotate along with the first rigid shaft 205, and the first rigid shaft 205 can rotate along with the rotation of the housing of the motor 201 to be tested under the action of the torque. One ends of two pull wires 207 are fixedly connected to the circumferential surface of the rotating disc 206. Two pull wires 207 are wound around the circumferential surface of the rotating disk 206. The other ends of the two wires 207 extend from opposite sides of the circumferential surface of the turntable 206 and are coplanar with the turntable 206. A fixing column 208 is respectively disposed on two sides of the first rigid shaft 205. Specifically, the fixing column 208 may be disposed on a bottom plate of the rack 203. Each fixing post 208 is connected with one end of each elastic element 209. The other end of each elastic member 209 is connected to the other end of each pulling wire 207. The elastic member 209 may be a spring. It will be appreciated that the two elastic members 209 are identical and have a varying length, and therefore the forces generated are identical, so that the turntable 206 is uniformly stressed.
The end surface of the end of the chassis of the load motor 202 facing away from the motor 201 to be tested is anchored to the other end plate of the frame 203 by a second rigid shaft 210. Specifically, the other end of the second rigid shaft 210 may be inserted through the other end plate of the frame 203, and the second rigid shaft 210 may be locked and anchored by a locking bolt abutting against a side wall of the second rigid shaft 210.
The first rigid shaft 205, the second rigid shaft 210, the rotating shaft of the motor 201 to be tested and the rotating shaft of the load motor 202 are all located on the same straight line, so that the stability of rotation can be ensured.
During measurement, the motor 201 to be measured is started by power supply, and the casing of the motor 201 to be measured correspondingly rotates due to torque, so that the first rigid shaft 205 also rotates and drives the turntable 206 to rotate. The pulling wire 207 moves with the rotation of the dial 206, thereby generating a force to the elastic member 209, resulting in a change in length of the elastic member 209. The force of the elastic member 209 may be obtained according to the varying length of the elastic member 209. The torque measured by the motor torque measuring system is the product of the force of the elastic member 209 and the radius of the turntable 206. Particularly, when the rotating shaft in the motor rotates at a high speed, the torque is indirectly obtained through the acting force of the elastic element 209 and the radius of the rotating disc 206 according to the torque sensed by the motor shell and the rotating disc 206 without adopting a torque sensor to measure the torque, so that the influence of high-speed rotation on the measurement accuracy is avoided.
The elastic member 209 is slightly elongated in a case where the motor is stationary due to the housing unevenness, thereby causing a certain error in the measurement of the torque. Therefore, preferably, when measuring, the system can also be used for measuring in a vertical placement mode besides the measurement in a horizontal placement mode. When the motor torque measurement system is used for measuring the torque of the motor to be measured, the axial directions of the first rigid shaft 205, the second rigid shaft 210, the rotating shaft of the motor 201 to be measured and the rotating shaft of the load motor 202 are all in a vertical state, that is, the motor torque measurement system is erected, and the motor 201 to be measured and the load motor 202 are stacked in the vertical direction, so that the influence caused by inhomogeneity can be eliminated. The motor torque measuring system can be integrally kept stable when erected particularly by arranging some conventional auxiliary fixing supports.
Before the torque measurement is performed, the motor torque measurement system may be calibrated in advance, i.e. the length of the elastic member 209 is calibrated to the force. Based on this, this motor torque measurement system still includes: and an alignment assembly for aligning the correspondence of the length of the elastic member 209 to the applied force. This calibration subassembly is detachable subassembly to can dismantle from motor torque measurement system when carrying out torque measurement, avoid influencing the torque measurement.
In a preferred embodiment of the present invention, the calibration assembly comprises: a first calibration weight and a third rigid shaft. The first calibration weight is hung at one end of the third rigid shaft. The other end of the third rigid shaft is detachably and fixedly connected with the turntable 206, so that the third rigid shaft and the first calibration weight can be installed during calibration; when the torque is actually measured, the third rigid shaft and the first calibration weight are detached, so that the measurement is prevented from being influenced. The third rigid shaft is horizontally arranged. The other end of the third rigid shaft may be detachably connected to the circumferential surface of the turntable 206, or may be detachably connected to the surface of the turntable 206. It should be understood that the first calibration weight may be a plurality of calibration weights of different masses. When the corresponding relation between the length of the elastic element 209 and the acting force is calibrated, the axial directions of the first rigid shaft 205, the second rigid shaft 210, the rotating shaft of the motor 201 to be measured and the rotating shaft of the load motor 202 are all horizontal directions, i.e. the motor torque measuring system does not need to be erected. When the length of the elastic element 209 is calibrated to correspond to the acting force, the motor 201 to be tested and the load motor 202 are kept static, i.e. not started. The principle of calibration can be achieved by adjusting the weight of the first calibration weight to balance the elastic force of the elastic member 209 (the first calibration weight and the elastic member 209 form an opposing force), and keeping the first rigid shaft 205 stationary, thereby determining the relationship between the weight of the first calibration weight and the changing length of the elastic member 209, and determining the force of the elastic member 209. It should be understood that only one needs to be calibrated since the two elastic members 209 are the same elastic member and are equally stressed.
In a preferred embodiment of the present invention, the motor torque measuring system further includes: a second calibration weight. The second calibration weight is detachably attached to any of the pull wires 207. The elastic members 209 corresponding to the pull wires 207 to which the second calibration weight is hooked are respectively positioned at both sides of the circumferential surface of the turntable 206. Likewise, the second calibration weight may be a plurality of calibration weights of different masses. When the corresponding relation between the length of the elastic element 209 and the acting force is calibrated, the axial directions of the first rigid shaft 205, the second rigid shaft 210, the rotating shaft of the motor 201 to be measured and the rotating shaft of the load motor 202 are all horizontal directions, i.e. the motor torque measuring system does not need to be erected. When the length of the elastic element 209 is calibrated to correspond to the acting force, the motor 201 to be tested and the load motor 202 are kept static, i.e. not started. The principle of calibration may be to balance the spring force of the elastic member 209 by adjusting the weight of the second calibration weight, keeping the first rigid shaft 205 stationary, and thereby determining the correspondence between the weight of the second calibration weight and the varying length of the elastic member 209, and thereby determining the force of the elastic member 209. It should be understood that only one needs to be calibrated since the two elastic members 209 are the same elastic member and are equally stressed.
Because the motor 201 to be tested and the load motor 202 are supported by the bracket, the torque generated by the load motor 202 can be synchronously reflected on the motor 201 to be tested, and is measured by the torque on the rotating shaft of the motor before and transferred to the shaft connected with the shell. Thereby enabling torque to be measured on a shaft connected to the housing. Therefore, the torque of the high-speed motor is measured. In addition, the motor can realize measurement not only for a high-speed motor but also for the existing motors with various rotating speeds.
During the high-speed rotation of the rotors of the two motors, the torque is transmitted to the casing of the motor 201 to be tested and the rotating disc connected between the casing and the end plate of the frame 203. During the measurement, the device can be horizontally placed; preferably, in order to reduce the influence of the homogeneity of the shell, the shell can be placed vertically for measurement.
Referring to fig. 5, 6, the zeroth order coefficient representing either bearing friction drag torque (i.e., the bearing of fig. 4) is the same and remains unchanged to-0.005 at any rotational speed; the first order coefficient of the friction resistance torque of any bearing at any rotating speed is the same and is kept not to become-0.01.
In the simulink simscape simulation system, through the above parameter settings, it can be found that, by using the apparatus in fig. 1 and the apparatus in fig. 3, the results of the simulation measurement are the test results in fig. 5 and fig. 6, respectively, where the ordinate is the torque and the abscissa is the time, it can be obtained that no matter what kind of torque sensor is used as the torque measuring apparatus, the measurement results are consistent, and the measurement results are very close to the measurement results of the conventional torque measuring apparatus, and the difference of the measurement results is the drag torque generated by two bearings in the motor 201 to be measured in the moving state.
The measured value of the torque measuring device of the invention is the real value of the electromagnetic torque generated by the motor 201 to be measured, and the measured value of the traditional torque measuring device is the real value of the electromagnetic torque generated by the motor to be measured minus the resistance torque generated by two bearings in the motor to be measured in a moving state. Therefore, the device of the invention has more accurate measuring result and can measure motors with various high and low rotating speeds.
In summary, the motor torque measurement system of the embodiment of the invention can measure the torque of the motor to be measured by causing the deformation of the elastic element due to the rotation of the casing of the motor to be measured, has high measurement precision, simple system structure and lower cost, and can be applied to the torque measurement of the motor rotating at high speed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A motor torque measurement system comprising: await measuring motor, load motor, power and frame, the pivot of the motor that awaits measuring with load motor's pivot is connected, the power is used for the drive the motor that awaits measuring rotates, the frame has relative both ends board, its characterized in that:
the shell of the motor to be tested is rotationally connected with a rotating shaft of the motor to be tested, the end face of one end, back to the load motor, of the shell of the motor to be tested is fixedly connected with one end of a first rigid shaft, the other end of the first rigid shaft is rotationally connected with one end plate of the rack, a turntable is fixedly sleeved on the first rigid shaft, one ends of two pull wires are fixedly connected to the circumferential surface of the turntable, the two pull wires are wound on the circumferential surface of the turntable, the other ends of the two pull wires respectively extend out of two opposite sides of the circumferential surface of the turntable, two sides of the first rigid shaft are respectively provided with a fixed column, each fixed column is connected with one end of each elastic piece, and the other end of each elastic piece is connected with the other end of each pull wire;
the end surface of one end, back to the motor to be tested, of the shell of the load motor is anchored with one end of a second rigid shaft, and the other end of the second rigid shaft is anchored with the other end plate of the rack;
the first rigid shaft, the second rigid shaft, the rotating shaft of the motor to be tested and the rotating shaft of the load motor are all located on the same straight line.
2. The motor torque measurement system of claim 1, wherein: when the motor torque measuring system is used for measuring the torque of the motor to be measured, the first rigid shaft, the second rigid shaft, the rotating shaft of the motor to be measured and the rotating shaft of the load motor are all horizontally placed or vertically placed in the axial direction.
3. The motor torque measurement system of claim 1, wherein: the torque measured by the motor torque measuring system is the product of the acting force of the elastic part and the radius of the turntable.
4. The motor torque measurement system of claim 1, further comprising: and the calibration assembly is used for calibrating the corresponding relation between the length of the elastic piece and the acting force.
5. The motor torque measurement system of claim 4, wherein the calibration assembly comprises: first calibration weight and third rigidity axle, first calibration weight is hung and is established the one end of third rigidity axle, the other end detachably of third rigidity axle connects the carousel, third rigidity axle level sets up.
6. The motor torque measurement system of claim 5, wherein the calibration assembly comprises: the second calibration weight, second calibration weight detachably articulates arbitrary on acting as go-between, just the second calibration weight with what the second calibration weight articulated act as go-between correspond the elastic component is located respectively the both sides of the periphery of carousel.
7. The motor torque measurement system of claim 4, wherein: when the corresponding relation of the length of the elastic part and the acting force is calibrated, the axial directions of the first rigid shaft, the second rigid shaft, the rotating shaft of the motor to be tested and the rotating shaft of the load motor are all in the horizontal direction.
8. The motor torque measurement system of claim 4, wherein: and when the corresponding relation between the length of the elastic piece and the acting force is calibrated, the motor to be tested and the load motor are kept static.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664628.7A CN111766006A (en) | 2020-07-10 | 2020-07-10 | Motor torque measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664628.7A CN111766006A (en) | 2020-07-10 | 2020-07-10 | Motor torque measuring system |
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| Publication Number | Publication Date |
|---|---|
| CN111766006A true CN111766006A (en) | 2020-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010664628.7A Pending CN111766006A (en) | 2020-07-10 | 2020-07-10 | Motor torque measuring system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202008418U (en) * | 2011-01-04 | 2011-10-12 | 浙江吉利汽车研究院有限公司 | Novel torque testing table |
| CN102759425A (en) * | 2012-06-29 | 2012-10-31 | 北京市三一重机有限公司 | Torque measuring device |
| CN207937091U (en) * | 2018-03-28 | 2018-10-02 | 苏州汇川技术有限公司 | Dynamic torque measuring system |
| CN208076071U (en) * | 2018-04-03 | 2018-11-09 | 中山明杰自动化科技有限公司 | Tool for testing torque of motor |
-
2020
- 2020-07-10 CN CN202010664628.7A patent/CN111766006A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202008418U (en) * | 2011-01-04 | 2011-10-12 | 浙江吉利汽车研究院有限公司 | Novel torque testing table |
| CN102759425A (en) * | 2012-06-29 | 2012-10-31 | 北京市三一重机有限公司 | Torque measuring device |
| CN207937091U (en) * | 2018-03-28 | 2018-10-02 | 苏州汇川技术有限公司 | Dynamic torque measuring system |
| CN208076071U (en) * | 2018-04-03 | 2018-11-09 | 中山明杰自动化科技有限公司 | Tool for testing torque of motor |
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Application publication date: 20201013 |