Back electromotive force measuring device of direct current motor

Abstract

The utility model relates to the technical field of motor measurement, and discloses a counter electromotive force measuring device of a direct current motor, which comprises a working table plate, a supporting seat and a digital oscilloscope are arranged at the upper end of the working table plate, two annular connecting plates are fixed at the upper end of the supporting seat, and fixing assemblies are arranged on the annular connecting plates. Wherein one annular connecting plate is fixedly provided with a connecting assembly through a fixing assembly, the lower end of the supporting seat is provided with a lifting mechanism, and the annular connecting plates and the fixing assembly are arranged, so that the to-be-tested motor is conveniently installed and fixed, and the problems that in the prior art, the steps for installing the to-be-tested motor are tedious, and time is consumed are solved; therefore, the measurement efficiency of the to-be-measured motor is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of motor measurement, in particular to a back electromotive force measuring device of a DC motor. Background Art

[0002] A motor primarily consists of a stator and rotor. When a DC voltage is applied to the motor's stator winding, the current in the stator winding generates a rotating magnetic field in the motor's air gap. Under the action of this rotating magnetic field, the rotor generates electromagnetic torque, causing the motor to start and enter synchronous operation. According to electromagnetic laws, when the magnetic field changes, the rotor cuts through the magnetic lines of flux, generating an induced electromotive force (EMF). The direction of this induced electromotive force conforms to Faraday's law and Lenz's law. Without considering losses, the induced electromotive force is exactly opposite to the voltage originally applied to the coil. This voltage is the motor's back EMF.

[0003] At present, the existing utility model with publication number CN215263899U discloses a double-thimble type back-electromotive force testing device, including a base and a first bracket arranged on one side of the base; a stator fixing member arranged horizontally on the first bracket for fixing the stator of the motor to be tested; a first elastic rotary thimble arranged horizontally on the first bracket; a second bracket movably arranged on the other side of the base and capable of sliding left and right relative to the base; a second elastic rotary thimble arranged horizontally on the second bracket and capable of sliding left and right relative to the base following the second bracket; the second elastic rotary thimble is arranged opposite to the first elastic rotary thimble, and is respectively used to abut against the two end surfaces of the rotor of the motor to be tested; a driving device is arranged on the base, used to connect with the rotor of the motor to be tested and drive the rotor of the motor to be tested to rotate.

[0004] In the above solution, the steps for installing the motor to be tested are relatively cumbersome, and the device structure is complex, which will cause the problem of taking a long time to install the motor to be tested, thereby affecting the measurement efficiency of the motor to be tested. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a back electromotive force measuring device for a DC motor. By providing an annular connecting plate and a fixing assembly, it is convenient to install and fix the motor to be measured, thereby solving the problem of the prior art that the steps for installing the motor to be measured are cumbersome and time-consuming, thereby not affecting the measurement efficiency of the motor to be measured.

[0006] The solution of the utility model to solve the technical problem is:

[0007] A back electromotive force measuring device for a DC motor includes a workbench. A support base and a digital oscilloscope are provided at the upper end of the workbench. Two annular connecting plates are fixed to the upper end of the support base. Fixed components are provided on the annular connecting plates. A connecting component is fixedly mounted on one of the annular connecting plates via the fixing component. The connecting component is electrically connected to the digital oscilloscope. A lifting mechanism is provided at the lower end of the support base.

[0008] When it is necessary to measure the back electromotive force of the motor to be tested, the motor to be tested is fixedly mounted on another annular connecting plate through a fixing component, and the output end of the motor to be tested is fixed on the connecting component. At the same time, the motor to be tested is electrically connected to a digital oscilloscope, and the connecting component is started to drive the output end of the motor to be tested to rotate. At the same time, the back electromotive force detection value on the digital oscilloscope is observed, so that the back electromotive force of the motor to be tested can be effectively measured.

[0009] The annular connecting plate and the fixing assembly are provided to facilitate installation and fixing of the motor to be tested, thereby solving the problem of complicated and time-consuming steps in the prior art for installing the motor to be tested, thereby not affecting the measurement efficiency of the motor to be tested.

[0010] The utility model is further configured as follows: the fixing assembly includes two threaded rods symmetrically fixed on the side wall of the annular connecting plate, one of the threaded rods is provided with an abutment rod, a notch is formed at the end of the abutment rod, and a plurality of nuts are screwed on the threaded rod, and the nuts abut against the side wall of the abutment rod.

[0011] Through the above technical solution, when the motor to be tested needs to be fixed and installed, the motor to be tested is inserted into the annular connecting plate, the nut is rotated, the abutment rod is moved, so that the abutment rod abuts against the side wall of the motor to be tested, and the abutment rod is rotated so that the notch is inserted into another threaded rod, and the nut is rotated so that the nut abuts against the side wall of the abutment rod, and the abutment rod is fixed, so that the motor to be tested can be fixed.

[0012] The utility model is further configured as follows: the connecting component includes a servo motor inserted into one of the annular connecting plates, the servo motor is fixed in the annular connecting plate through a fixing component, a coupling is fixed on the output end of the servo motor, and the servo motor is electrically connected to the digital oscilloscope.

[0013] Through the above technical solution, when it is necessary to measure the back electromotive force of the motor to be tested, the component to be tested is fixed in another annular connecting plate through the fixing component, and the output end of the motor to be tested is inserted into the coupling, and the servo motor is started, thereby driving the output end of the motor to be tested to rotate through the coupling, so that the back electromotive force of the motor to be tested can be measured.

[0014] The utility model is further configured as follows: the lifting mechanism includes two groups of lifting components and a group of control components that are symmetrically arranged on the left and right, the lifting component includes a first connecting rod rotatably connected to the lower end of the support seat, the lower end of the support seat is symmetrically formed with two first sliding grooves, the second connecting rod is slidably connected in the first sliding groove, the middle part of the first connecting rod and the middle part of the second connecting rod are rotatably connected to each other, the end of the first connecting rod is rotatably connected to the third connecting rod, the end of the second connecting rod is rotatably connected to the fourth connecting rod, the middle part of the third connecting rod and the middle part of the fourth connecting rod are rotatably connected to each other, the end of the fourth connecting rod is rotatably connected to the support plate, the upper end of the support plate is formed with a second sliding groove, the end of the third connecting rod is slidably connected in the second sliding groove, and the control component is simultaneously arranged on the protruding ends of the two second connecting rods passing through the first sliding groove.

[0015] Through the above technical solution, when the support base needs to be adjusted to the required height, the two second connecting rods are driven to slide at the same time through the control component, so that the support base can move up or down, so that the support base can be adjusted to a suitable height as needed, thereby facilitating the staff to measure the back electromotive force of the motor to be tested.

[0016] The utility model is further configured as follows: the control component includes a connecting plate, the two ends of the connecting plate are respectively fixed on the protruding ends of the two second connecting rods passing through the first slide groove, the lower end of the support seat is screwed with a screw, and the end of the screw is rotatably connected to the side wall of the connecting plate.

[0017] With the above technical solution, when it is necessary to drive the two second connecting rods to slide at the same time, the screw rod is rotated to drive the connecting plate to move, so that the two second connecting rods can be driven to slide at the same time through the connecting plate.

[0018] The utility model is further configured as follows: a rubber pad is fixed to the lower end of the support plate.

[0019] Through the above technical solution, by providing the rubber pad, the friction between the support plate and the workbench is increased, so that the utility model will not slide easily, and at the same time can protect the support plate.

[0020] The utility model is further configured as follows: the two annular connecting plates are coaxially arranged.

[0021] The above technical solution can prevent the output end of the motor to be tested from being unable to be effectively inserted into the coupling.

[0022] The utility model is further configured as follows: a handle is fixed to the end of the screw.

[0023] With the above technical solution, when the screw needs to be driven to rotate, a handle is provided to facilitate driving the screw to rotate.

[0024] The beneficial effects of the utility model are:

[0025] Compared with the existing technology, the annular connecting plate and the fixing assembly are provided to facilitate the installation and fixing of the motor to be tested, thereby solving the problem of the existing technology that the installation steps of the motor to be tested are cumbersome and time-consuming, and thus will not affect the measurement efficiency of the motor to be tested.

[0026] The rubber pad is provided so that the utility model will not slide easily and at the same time plays a role in protecting the support plate.

[0027] The handle is provided to facilitate driving the screw to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of the utility model;

[0029] Figure 2 It is a three-dimensional structural schematic diagram of the utility model;

[0030] Figure 3 Schematic diagram of the three-dimensional structure of the lifting mechanism.

[0031] Figure markings: 1. workbench; 2. support base; 201. first slide groove; 3. digital oscilloscope; 4. annular connecting plate; 5. threaded rod; 6. abutting rod; 601. notch; 7. nut; 8. servo motor; 9. coupling; 10. first connecting rod; 11. second connecting rod; 12. third connecting rod; 13. fourth connecting rod; 14. support plate; 1401. second slide groove; 15. connecting plate; 16. screw; 17. rubber pad; 18. handle. DETAILED DESCRIPTION

[0032] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] The following references Figures 1 to 3 The present utility model will be described.

[0034] A back electromotive force measuring device for a DC motor includes a workbench 1. A support base 2 and a digital oscilloscope 3 are provided at the upper end of the workbench 1. Two annular connecting plates 4 are fixed to the upper end of the support base 2. The annular connecting plates 4 are provided with fixing components. A connecting component is fixedly mounted on one of the annular connecting plates 4 via the fixing component. The connecting component is electrically connected to the digital oscilloscope 3. A lifting mechanism is provided at the lower end of the support base 2.

[0035] When it is necessary to measure the back electromotive force of the motor to be tested, the motor to be tested is fixedly mounted on another annular connecting plate 4 through a fixing component, and the output end of the motor to be tested is fixed on the connecting component. At the same time, the motor to be tested is electrically connected to the digital oscilloscope 3, and the connecting component is started to drive the output end of the motor to be tested to rotate. At the same time, the back electromotive force detection value on the digital oscilloscope 3 is observed, so that the back electromotive force of the motor to be tested can be effectively measured.

[0036] The annular connecting plate 4 and the fixing assembly facilitate installation and fixing of the motor to be tested, thereby solving the problem of complicated and time-consuming installation of the motor to be tested in the prior art, thereby not affecting the measurement efficiency of the motor to be tested.

[0037] The fixing assembly includes two threaded rods 5 symmetrically fixed on the side wall of the annular connecting plate 4, one of the threaded rods 5 is provided with an abutment rod 6, the end of the abutment rod 6 is formed with a notch 601, and a plurality of nuts 7 are screwed on the threaded rod 5, and the nuts 7 abut against the side wall of the abutment rod 6.

[0038] When the motor to be tested needs to be fixed and installed, the motor to be tested is inserted into the annular connecting plate 4, the nut 7 is rotated, the abutment rod 6 is moved, so that the abutment rod 6 abuts against the side wall of the motor to be tested, and the abutment rod 6 is rotated so that the notch 601 is inserted into the other threaded rod 5, and the nut 7 is rotated so that the nut 7 abuts against the side wall of the abutment rod 6 to fix the abutment rod 6, thereby fixing the motor to be tested.

[0039] The connecting assembly includes a servo motor 8 inserted into one of the annular connecting plates 4. The servo motor 8 is fixed in the annular connecting plate 4 through a fixing assembly. A coupling 9 is fixed to the output end of the servo motor 8. The servo motor 8 is electrically connected to the digital oscilloscope 3.

[0040] When it is necessary to measure the back electromotive force of the motor to be tested, the component to be tested is fixed in another annular connecting plate 4 through a fixing component, and the output end of the motor to be tested is inserted into the coupling 9, and the servo motor 8 is started, thereby driving the output end of the motor to be tested to rotate through the coupling 9, so that the back electromotive force of the motor to be tested can be measured.

[0041] The lifting mechanism includes two groups of lifting components and a group of control components that are symmetrically arranged on the left and right. The lifting component includes a first connecting rod 10 that is rotatably connected to the lower end of the support seat 2. Two first sliding grooves 201 are symmetrically formed at the lower end of the support seat 2. The second connecting rod 11 is slidably connected in the first sliding groove 201. The middle part of the first connecting rod 10 and the middle part of the second connecting rod 11 are rotatably connected to each other. The end of the first connecting rod 10 is rotatably connected to the third connecting rod 12, and the end of the second connecting rod 11 is rotatably connected to the fourth connecting rod 13. The middle part of the third connecting rod 12 and the middle part of the fourth connecting rod 13 are rotatably connected to each other. The end of the fourth connecting rod 13 is rotatably connected to the support plate 14, and the upper end of the support plate 14 is formed with a second sliding groove 1401. The end of the third connecting rod 12 is slidably connected in the second sliding groove 1401. The control component is also arranged on the protruding ends of the two second connecting rods 11 passing through the first sliding groove 201.

[0042] When the support base 2 needs to be adjusted to the required height, the two second connecting rods 11 are driven to slide simultaneously by the control component, so that the support base 2 can move up or down, so that the support base 2 can be adjusted to a suitable height as needed, thereby facilitating the staff to measure the back electromotive force of the motor to be tested.

[0043] The control component includes a connecting plate 15, the two ends of which are respectively fixed on the protruding ends of the two second connecting rods 11 passing through the first slide groove 201. The lower end of the support seat 2 is screwed with a screw 16, and the end of the screw 16 is rotatably connected to the side wall of the connecting plate 15.

[0044] When it is necessary to drive the two second connecting rods 11 to slide at the same time, the screw rod 16 is rotated to drive the connecting plate 15 to move, so that the two second connecting rods 11 can be driven to slide at the same time through the connecting plate 15.

[0045] A rubber pad 17 is fixed to the lower end of the support plate 14 .

[0046] By providing the rubber pad 17 , the friction between the support plate 14 and the workbench 1 is increased, so that the utility model will not slide easily, and at the same time, the support plate 14 can be protected.

[0047] The two annular connecting plates 4 are coaxially arranged.

[0048] This prevents the output end of the motor to be tested from being effectively inserted into the coupling 9.

[0049] A handle 18 is fixed to the end of the screw rod 16 .

[0050] When the screw rod 16 needs to be driven to rotate, a handle 18 is provided to facilitate driving the screw rod 16 to rotate.

[0051] Working principle:

[0052] When it is necessary to measure the back electromotive force of the motor to be tested, the motor to be tested is inserted into the annular connecting plate 4, the nut 7 is rotated, the abutment rod 6 is moved, so that the abutment rod 6 abuts against the side wall of the motor to be tested, and the abutment rod 6 is rotated so that the notch 601 is inserted into the other threaded rod 5, and the nut 7 is rotated so that the nut 7 abuts against the side wall of the abutment rod 6, and the abutment rod 6 is fixed, thereby fixing the motor to be tested, and the output end of the motor to be tested is inserted into the coupling 9, and at the same time, the motor to be tested is electrically connected to the digital oscilloscope 3, and the servo motor 8 is started, thereby driving the output end of the motor to be tested to rotate through the coupling 9, and at the same time observing the back electromotive force detection value on the digital oscilloscope 3, so that the back electromotive force of the motor to be tested can be effectively measured.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications based on the above assumptions should also be regarded as within the scope of protection of the present invention.

Claims

1. A device for measuring back electromotive force of a DC motor, comprising a workbench (1), characterized in that: A support base (2) and a digital oscilloscope (3) are provided at the upper end of the workbench (1); two annular connecting plates (4) are fixed to the upper end of the support base (2); a fixing assembly is provided on the annular connecting plates (4); a connecting assembly is fixedly mounted on one of the annular connecting plates (4) via the fixing assembly; and a lifting mechanism is provided at the lower end of the support base (2).

2. The back electromotive force measuring device of a DC motor according to claim 1, characterized in that: The fixing assembly comprises two threaded rods (5) symmetrically fixed on the side wall of the annular connecting plate (4), wherein an abutting rod (6) is sleeved on one of the threaded rods (5), a notch (601) is formed at the end of the abutting rod (6), and a plurality of nuts (7) are screwed on the threaded rod (5), and the nuts (7) abut against the side wall of the abutting rod (6).

3. The back electromotive force measuring device of a DC motor according to claim 1, wherein: The connecting assembly includes a servo motor (8) inserted into one of the annular connecting plates (4). The servo motor (8) is fixed in the annular connecting plate (4) via a fixing assembly. A coupling (9) is fixed to the output end of the servo motor (8).

4. The back electromotive force measuring device of a DC motor according to claim 1, wherein: The lifting mechanism includes two groups of lifting components and a group of control components that are symmetrically arranged on the left and right sides. The lifting component includes a first connecting rod (10) that is rotatably connected to the lower end of the support seat (2). The lower end of the support seat (2) is symmetrically formed with two first sliding grooves (201). A second connecting rod (11) is slidably connected in the first sliding groove (201). The middle part of the first connecting rod (10) and the middle part of the second connecting rod (11) are rotatably connected to each other. The end of the first connecting rod (10) is rotatably connected to the third connecting rod (12). The second connecting rod (11) is rotatably connected to the first connecting rod (10). The end of the connecting rod (11) is rotatably connected to the fourth connecting rod (13), the middle part of the third connecting rod (12) and the middle part of the fourth connecting rod (13) are rotatably connected to each other, the end of the fourth connecting rod (13) is rotatably connected to the support plate (14), the upper end of the support plate (14) is formed with a second slide groove (1401), the end of the third connecting rod (12) is slidably connected in the second slide groove (1401), and the control component is simultaneously arranged on the protruding ends of the two second connecting rods (11) passing through the first slide groove (201).

5. The back electromotive force measuring device of a DC motor according to claim 4, characterized in that: The control assembly includes a connecting plate (15), the two ends of which are respectively fixed to the protruding ends of the two second connecting rods (11) passing through the first sliding groove (201), the lower end of the support seat (2) is screwed with a screw rod (16), and the end of the screw rod (16) is rotatably connected to the side wall of the connecting plate (15).

6. The back electromotive force measuring device of a DC motor according to claim 4, characterized in that: A rubber pad (17) is fixed to the lower end of the support plate (14).

7. The back electromotive force measuring device of a DC motor according to claim 3, characterized in that: The two annular connecting plates (4) are coaxially arranged.

8. The back electromotive force measuring device of a DC motor according to claim 5, characterized in that: A handle (18) is fixed to the end of the screw rod (16).

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