CN115267534A

CN115267534A - Drive motor testing device and method for electric automobile

Info

Publication number: CN115267534A
Application number: CN202210906260.XA
Authority: CN
Inventors: 雍清萍
Original assignee: Shenzhen Huazhong Aviation Technology Testing Co ltd
Current assignee: Shenzhen Huazhong Aviation Technology Testing Co ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-11-01

Abstract

The invention relates to the technical field of electric automobile driving motors, in particular to a driving motor testing device and method for an electric automobile. The invention provides a driving motor testing device and method for an electric automobile, which can test motors of different models. A drive motor testing device for an electric automobile comprises a testing rack; the left side inside the test rack is connected with a supporting block; the supporting block is internally connected with a test motor; the left side in the test rack is connected with the tester, the tester is positioned on the right side of the supporting block, the output shaft of the test motor is connected with the tester, and the inside of the tester can rotate; support adjustment mechanism, the inside right side of test rack is equipped with supports adjustment mechanism. The driving motor is driven to move up and down by the L-shaped baffle, so that the driving motor support device can be suitable for supporting the driving motors with different heights, is convenient for testing different driving motors, and has better practicability.

Description

Drive motor testing device and method for electric automobile

Technical Field

The invention relates to the technical field of electric automobile driving motors, in particular to a driving motor testing device and method for an electric automobile.

Background

After the driving motor of the electric automobile is machined and assembled, the driving motor needs to be tested, an output shaft of the driving motor is connected with a test motor and a corresponding side structure, and after the driving motor is driven to rotate by the test motor, state parameters and the like of the driving motor during rotation are tested by a test structure. However, when the existing test simulation device is used for installing a driving motor, the motor is usually directly fixed on a corresponding structure, so that the subsequent position adjustment of the motor is inconvenient, and particularly, when different motors are tested, the heights of the output shafts of the motors are slightly different, so that the output shafts of the motors cannot be accurately connected with the power shaft of the test mechanism.

In summary, a driving motor testing apparatus and method for an electric vehicle capable of testing motors of different models needs to be developed.

Disclosure of Invention

In order to overcome the defect that the existing testing device cannot test different motors and overcome the defects of the prior art, the invention provides the driving motor testing device and the driving motor testing method for the electric automobile, which can test the motors with different models.

In order to realize the purpose, the invention is realized by the following scheme: a drive motor testing device for an electric automobile comprises:

a test rack;

the left side inside the test rack is connected with a supporting block;

the inside of the supporting block is connected with a test motor;

the left side in the test rack is connected with the tester, the tester is positioned on the right side of the supporting block, an output shaft of the test motor is connected with the tester, and the inside of the tester can rotate;

the supporting and adjusting mechanism is arranged on the right side in the testing rack and used for supporting the object to be tested, the supporting and adjusting mechanism supports the object to be tested, the object to be tested and the testing motor are assisted to keep concentric in height, and the supporting and adjusting mechanism is in contact with the tester;

the clamping mechanism supports the inside clamping mechanism that is used for carrying on spacingly to the determinand that is equipped with of adjustment mechanism, and clamping mechanism moves to the right and carries out the chucking to the determinand, prevents that the determinand can become flexible when detecting.

Further, the support adjusting mechanism includes:

the guide rails are symmetrically connected with the front and the back of the lower right side in the test rack, and the left sides of the two guide rails are connected with the supporting block;

the sliding frames are connected to the right sides of the two guide rails in a sliding manner;

the right parts of the two guide rails are sleeved with the first springs, and two ends of each first spring are respectively connected with the inner wall of the test rack and the right side of the sliding rack;

the sliding frame is internally and slidably connected with an L-shaped baffle;

the bottom of the L-shaped baffle and the bottom in the sliding frame are connected with a second spring;

driving motor has been placed at L shape baffle top, and through putting driving motor on L shape baffle, L shape baffle is used for supporting driving motor, guarantees that driving motor and test motor height are concentric.

Further, the chucking mechanism includes:

the lower part of the L-shaped baffle is symmetrically connected with the guide plate in the front and back direction, and the lower part of the driving motor slides in the guide plate;

push pedal and third spring, two deflector inner wall left sides all have through third spring coupling to be used for carrying out spacing push pedal to driving motor, and two push pedal right sides all contact with driving motor, turn right through the push pedal and remove spacing driving motor, prevent that driving motor can become flexible when the test.

Further explaining, still including being used for carrying out the positioning mechanism to L shape baffle, positioning mechanism includes:

the middle of the bottom in the test rack is connected with two positioning plates, and the upper right sides of the two positioning plates are both in a tooth shape;

the left lower side of the L-shaped baffle is connected with the U-shaped rods in a sliding mode in a front-back symmetrical mode, the left side faces of the two U-shaped rods are rough faces, the two U-shaped rods are in contact with the adjacent positioning plates, the L-shaped baffle is positioned through friction force between the U-shaped rods and the positioning plates, and the driving motor is prevented from shaking up and down during testing;

and the right sides of the two U-shaped rods are connected with the L-shaped baffle plate internally.

Further explain, still including being used for carrying out the side fixed establishment to the side of driving motor, side fixed establishment including:

the front side and the rear side of the upper part of the sliding frame are both connected with wedge-shaped rods;

the front side and the rear side of the right part of the test rack are symmetrically connected with the U-shaped connecting rod in a sliding manner;

the buffer plates are connected inside the two U-shaped connecting rods;

two fifth springs are sleeved on the inner sides of the two U-shaped connecting rods, and two ends of each fifth spring are connected with the buffer plate and the inner wall of the test rack respectively;

the upper parts of the two buffer plates are connected with fixed clamping plates used for fixing the side edges of the driving motor in a sliding mode, and the fixed clamping plates move towards the inner sides and are used for clamping and positioning the front side and the rear side of the driving motor;

and the middle parts of the two fixing clamping plates are sleeved with two sixth springs, and two ends of each sixth spring are respectively connected with the fixing clamping plates and the buffer plate.

Further, the device also comprises a guide mechanism for reducing the friction force between the driving motor and the fixed clamping plate, wherein the guide mechanism comprises:

the inner parts of the two fixed clamping plates are connected with four sliding blocks in a sliding manner;

the eight sliding blocks are respectively and rotatably connected with a guide wheel used for reducing the friction force between the driving motor and the fixed clamping plate, the guide wheel is driven by the fixed clamping plate to move towards the inner side to be contacted with the driving motor, and the guide wheel is used for reducing the friction force between the driving motor and the fixed clamping plate;

and the outer sides of the four sliding blocks on the same fixed clamping plate are connected with seventh springs with the fixed clamping plate.

Further, the testing device also comprises an alignment mechanism for assisting the alignment of the driving motor and the tester, wherein the alignment mechanism comprises:

the alignment rod is connected to the upper side of the middle inner rear wall of the test rack and used for assisting the alignment of the driving motor and the tester;

the front side of the alignment rod is connected with two limiting plates in a sliding mode, the driving motor is limited through the limiting plates, and the output shaft of the auxiliary driving motor is accurately inserted into the tester;

the upper part of the limiting plate on the front side is sleeved with the eighth spring, the rear lower side of the alignment rod is sleeved with the eighth spring, two ends of the eighth spring on the upper side are respectively connected with the limiting plate on the front side and the alignment rod, and two ends of the eighth spring on the lower side are respectively connected with the rear lower side of the limiting plate on the rear side and the rear lower side of the alignment rod;

the limiting block is connected with the middle of the bottom in the test rack and used for limiting the limiting plate, and the limiting block is located between the two limiting plates.

A method for testing a driving motor for an electric automobile comprises the following steps:

s1, ensuring that the motor axes of a driving motor and a testing motor are concentric in height when detecting that the motor axes of the driving motor and the testing motor are concentric;

s2, the test motor starts to operate to drive an output shaft of the driving motor to rotate;

and S3, detecting the torque and the rotating speed of the driving motor by the tester so as to evaluate the mechanical performance of the driving motor.

The invention has at least one of the following advantages: the driving motor is driven to move up and down by the L-shaped baffle, so that the driving motor support device can be suitable for supporting the driving motors with different heights, is convenient for testing different driving motors, and has better practicability; the U-shaped rod moves leftwards to be in contact with the positioning plate, so that the positioning plate positions the U-shaped rod, the L-shaped baffle can be positioned, the driving motor can be prevented from shaking up and down during testing, and the stability of the driving motor can be improved; the front side and the rear side of the driving motor are clamped by moving the fixed clamping plate to the inner side, so that the driving motor can be further positioned, the stability of the driving motor is further improved, and the testing effect is improved; the guide wheel is driven by the fixed clamping plate to move towards the inner side to be in contact with the driving motor, the friction force between the driving motor and the fixed clamping plate can be reduced by the guide wheel, and the driving motor can conveniently move; carry on spacingly through the limiting plate to driving motor's output shaft, make things convenient for in better the inserting tester of driving motor's output shaft, improve efficiency of software testing.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic sectional perspective view of the present invention.

Fig. 3 is a schematic perspective view of the supporting and adjusting mechanism of the present invention.

Fig. 4 is a schematic perspective view of the chucking mechanism of the present invention.

Fig. 5 is a schematic sectional perspective view of the chucking mechanism of the present invention.

Fig. 6 is a schematic perspective view of the positioning mechanism of the present invention.

Fig. 7 is an enlarged schematic perspective view of the invention at a.

Fig. 8 is a schematic perspective view of the side fixing mechanism of the present invention.

Fig. 9 is a schematic sectional three-dimensional structure of the lateral fixing mechanism of the present invention.

Fig. 10 is a schematic perspective view of a first guiding mechanism according to the present invention.

Fig. 11 is a schematic perspective view of a second guiding mechanism of the present invention.

Fig. 12 is a schematic perspective view of an alignment mechanism according to the present invention.

In the above drawings: 1: test rack, 2: supporting block, 3: test motor, 4: tester, 5: support adjustment mechanism, 51: guide rail, 52: first spring, 53: carriage, 54: l-shaped baffle, 55: drive motor, 56: second spring, 6: chucking mechanism, 61: guide plate, 62: push plate, 63: third spring, 7: positioning mechanism, 71: positioning plate, 72: u-shaped bar, 73: fourth spring, 8: side fixing mechanism, 81: wedge rod, 82: cushion plate, 83: u-shaped link, 84: fifth spring, 85: fixation splint, 86: sixth spring, 9: guide mechanism, 91: guide wheel, 92: slider, 93: seventh spring, 10: alignment mechanism, 101: alignment rod, 102: a limiting plate, 103: eighth spring, 104: and a limiting block.

Detailed Description

The invention will be further described with reference to the accompanying drawings and the detailed description below:

example 1

A driving motor testing device for an electric automobile is disclosed, as shown in FIGS. 1-5, comprising a testing frame 1, a supporting block 2, a testing motor 3, a tester 4, a supporting adjusting mechanism 5, a guide rail 51, a first spring 52, a sliding frame 53, an L-shaped baffle 54, a driving motor 55, a second spring 56, a clamping mechanism 6, a guide plate 61, a push plate 62 and a third spring 63, wherein the supporting block 2 is fixedly connected to the left side inside the testing frame 1 through a bolt, the testing motor 3 is fixedly connected to the inside of the supporting block 2 through a bolt, the tester 4 is fixedly connected to the left side inside the testing frame 1 through a bolt, the tester 4 is positioned at the right side of the supporting block 2, an output shaft of the testing motor 3 is connected with the tester 4, the inside of the tester 4 can rotate, the supporting adjusting mechanism 5 is arranged at the right side inside the testing frame 1, the supporting adjusting mechanism 5 is used for supporting an object to be tested, the supporting and adjusting mechanism 5 is contacted with the tester 4, the inside of the supporting and adjusting mechanism 5 is provided with a clamping mechanism 6, the clamping mechanism 6 is used for limiting an object to be tested, the front and back symmetrical welding of the lower right side inside the testing rack 1 is provided with guide rails 51, the left sides of the two guide rails 51 are both welded with the supporting block 2, the right sides of the two guide rails 51 are connected with a sliding frame 53 in a sliding way, the right parts of the two guide rails 51 are sleeved with a first spring 52, two ends of the first spring 52 are respectively connected with the inner wall of the testing rack 1 and the right side of the sliding frame 53, the inside of the sliding frame 53 is connected with an L-shaped baffle 54 in a sliding way, the bottom of the L-shaped baffle 54 and the inner bottom of the sliding frame 53 are connected with a second spring 56, the top of the L-shaped baffle 54 is provided with a driving motor 55, the front and back symmetrical welding of the lower part of the L-shaped baffle 54 is provided with guide plates 61, the lower part of the driving motor 55 slides in the guide plates 61, the left sides of the inner walls of the two guide plates 61 are both connected with a push plate 62 through a third spring 63, the push plates 62 are used for limiting the driving motor 55, and the right sides of the two push plates 62 are in contact with the driving motor 55.

When the device is used, the sliding frame 53 is pulled to the right, the first spring 52 is compressed, the driving motor 55 to be detected is placed on the L-shaped baffle 54 to drive the L-shaped baffle 54 to move downwards, the second spring 56 is compressed, so that the driving motors 55 with different heights can be supported, different driving motors 55 can be tested, the driving motor 55 is clamped between the two guide plates 61 to push the push plate 62 to move to the left, the third spring 63 is compressed, the push plate 62 moves to the right under the action of the third spring 63 to clamp the driving motor 55, the driving motor 55 can be prevented from loosening during testing, the testing result is influenced, the sliding frame 53 is loosened, the first spring 52 resets at the moment, the sliding frame 53, the L-shaped baffle 54 and the driving motor 55 move to the left, make the output shaft of driving motor 55 insert in the tester 4, make the output shaft of driving motor 55 aim at with the output shaft of test motor 3, guarantee highly concentric, subsequently, start test motor 3, adjust the rotational speed of test motor 3, obtain the moment of torsion and the rotational speed of driving motor 55 through the measurement of tester 4, thereby come the mechanical properties of evaluation driving motor 55, the test is finished, close test motor 3, again manually pull carriage 53 to the right, make driving motor 55 and tester 4 separate, then take off driving motor 55, third spring 63 resets this moment, drive push pedal 62 and move to the right and reset, second spring 56 resets simultaneously, drive L-shaped baffle 54 and move to the top and reset, loosen carriage 53 afterwards, first spring 52 resets this moment, drive carriage 53 moves to the left and resets.

Example 2

On the basis of embodiment 1, as shown in fig. 2, 6 and 7, the test rack further comprises a positioning mechanism 7, the positioning mechanism 7 is used for positioning the L-shaped baffle 54, the positioning mechanism 7 comprises a positioning plate 71, U-shaped rods 72 and a fourth spring 73, two positioning plates 71 are welded in the middle of the bottom in the test rack 1, the upper right sides of the two positioning plates 71 are both in a tooth shape, the lower left side of the L-shaped baffle 54 is connected with the U-shaped rods 72 in a front-back symmetrical and sliding manner, the left side surfaces of the two U-shaped rods 72 are both rough surfaces, the two U-shaped rods 72 are both in contact with the adjacent positioning plates 71, and the right sides of the two U-shaped rods 72 are both connected with the fourth spring 73 inside the L-shaped baffle 54. When the sliding frame 53 moves leftwards, the L-shaped baffle 54 and the U-shaped rod 72 are driven to move leftwards, when the U-shaped rod 72 moves leftwards to be in contact with the positioning plate 71, the fourth spring 73 is compressed at the moment, the positioning plate 71 positions the L-shaped baffle 54 and the sliding frame 53, the left side surface of the U-shaped rod 72 is a tooth-shaped surface, and the left side surface of the U-shaped rod 72 is a rough surface, so that the friction force between the positioning plate 71 and the U-shaped rod 72 is large, the U-shaped rod 72 can be positioned, the L-shaped baffle 54 and the driving motor 55 can be positioned, the driving motor 55 is prevented from shaking up and down during testing, the stability of the driving motor 55 can be improved, when the sliding frame 53 drives the L-shaped baffle 54 and the U-shaped rod 72 to move rightwards to reset, at the moment, the fourth spring 73 resets, and drives the U-shaped rod 72 to move leftwards to reset.

As shown in fig. 2, fig. 8 and fig. 9, the testing machine further comprises a side fixing mechanism 8 for fixing the side of the driving motor 55, the side fixing mechanism 8 comprises wedge rods 81, buffer plates 82, U-shaped connecting rods 83, fifth springs 84, fixing clamp plates 85 and sixth springs 86, the wedge rods 81 are welded on the front side and the rear side of the upper portion of the sliding frame 53, the U-shaped connecting rods 83 are symmetrically and slidably connected on the front side and the rear side of the right portion of the testing frame 1, the buffer plates 82 are welded inside the two U-shaped connecting rods 83, the two fifth springs 84 are sleeved on the inner sides of the two U-shaped connecting rods 83, two ends of each fifth spring 84 are respectively connected with the buffer plates 82 and the inner wall of the testing frame 1, the fixing clamp plates 85 are slidably connected on the upper portions of the two buffer plates 82, the fixing clamp plates 85 are used for fixing the side of the driving motor 55, the two sixth springs 86 are sleeved on the middle portions of the two fixing clamp plates 85, and two ends of each sixth spring 86 are respectively connected with the fixing clamp plates 85 and the buffer plates 82. When the sliding frame 53 moves leftwards, the wedge-shaped rod 81 is driven to move leftwards, when the wedge-shaped rod 81 moves leftwards to be in contact with the buffer plate 82, the buffer plate 82 is extruded to move inwards, the U-shaped connecting rod 83 is driven to move inwards, the fifth spring 84 is stretched at the moment, the buffer plate 82 moves inwards to drive the fixed clamp plate 85 to move inwards, when the fixed clamp plate 85 moves inwards to be in contact with the driving motor 55, the fixed clamp plate 85 fixes the front side and the rear side of the driving motor 55, the sixth spring 86 is compressed at the moment, the driving motor 55 can be further positioned, the stability of the driving motor 55 is further improved, the test effect is improved, when the sliding frame 53 moves rightwards to reset, the wedge-shaped rod 81 is driven to move rightwards to reset, when the wedge-shaped rod 81 moves rightwards to be separated from the buffer plate 82, the fifth spring 84 resets at the moment, the buffer plate 82 is driven, the U-shaped connecting rod 83 and the fixed clamp plate 85 move outwards to reset, the sixth spring 86 drives the fixed clamp plate 85 to move inwards to reset at the moment.

As shown in fig. 2, fig. 10 and fig. 11, the clamping device further includes a guiding mechanism 9, the guiding mechanism 9 is used for reducing the friction force between the driving motor 55 and the fixing clamp plate 85, the guiding mechanism 9 includes a guiding wheel 91, sliding blocks 92 and seventh springs 93, four sliding blocks 92 are slidably connected inside two fixing clamp plates 85, the eight sliding blocks 92 are rotatably connected with the guiding wheel 91, the guiding wheel 91 is used for reducing the friction force between the driving motor 55 and the fixing clamp plate 85, and the seventh springs 93 are connected with the fixing clamp plate 85 at the outer sides of the four sliding blocks 92 on the same fixing clamp plate 85. When the fixed clamping plate 85 moves towards the inner side, the guide wheel 91 and the sliding block 92 are driven to move towards the inner side, when the guide wheel 91 moves towards the inner side to be in contact with the driving motor 55, the guide wheel 91 and the sliding block 92 are extruded to move towards the outer side, the seventh spring 93 is compressed at the moment, meanwhile, the guide wheel 91 can reduce the friction force between the driving motor 55 and the fixed clamping plate 85, and the situation that when the fixed clamping plate 85 is in contact with the driving motor 55, the driving motor 55 cannot move towards the left continuously, so that the output shaft of the driving motor 55 cannot be completely inserted into the tester 4 to influence the testing work of the driving motor 55 is avoided.

As shown in fig. 1, fig. 2 and fig. 12, the testing device further includes an alignment mechanism 10, the alignment mechanism 10 is used for aligning the auxiliary driving motor 55 with the tester 4, the alignment mechanism 10 includes an alignment rod 101, a limiting plate 102, an eighth spring 103 and a limiting block 104, the alignment rod 101 is welded on the upper side of the inner rear wall of the testing rack 1, the alignment rod 101 is used for aligning the auxiliary driving motor 55 with the tester 4, the alignment rod 101 is connected with two limiting plates 102 in a front sliding manner, the eighth spring 103 is sleeved on the upper portion of the limiting plate 102 on the front side, the eighth spring 103 is sleeved on the lower side of the rear side of the alignment rod 101, two ends of the eighth spring 103 on the upper side are respectively connected with the limiting plate 102 and the alignment rod 101 on the front side, two ends of the eighth spring 103 on the lower side are respectively connected with the lower side of the rear side of the limiting plate 102 on the rear side and the lower side of the alignment rod 101, a middle limiting block 104 is welded on the bottom of the testing rack 1, the limiting block 104 is used for limiting the limiting plate 102, and the limiting block 104 is located between the two limiting plates 102. When driving motor 55 moved to the left, driving motor 55's output shaft passes in two limiting plates 102 insert tester 4, eighth spring 103 is compressed this moment, limiting plate 102 can counterpoint driving motor 55, prevent driving motor 55's offset, thereby lead to driving motor 55's output shaft can't get into in tester 4, influence efficiency of software testing, when driving motor 55 moved to the right and when separating with limiting plate 102, eighth spring 103 resets this moment, drive limiting plate 102 and move to the inboard and reset and stopper 104 contact, stopper 104 is used for spacing limiting plate 102, prevent two limiting plate 102 contacts, lead to driving motor 55's output shaft can't pass between two limiting plates 102.

s1, ensuring that the motor axis of a driving motor 55 is concentric with the motor axis of a testing motor 3 in height when the motor axis of the driving motor is detected;

step S2, the test motor 3 starts to operate to drive the output shaft of the drive motor 55 to rotate;

in step S3, the tester 4 detects the torque and the rotation speed of the drive motor 55 to evaluate the mechanical performance of the drive motor 55.

While the disclosure has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that various other embodiments can be devised which do not depart from the scope of the invention as disclosed herein. Accordingly, the scope of the invention should be limited only by the attached claims.

Claims

1. The utility model provides a driving motor testing arrangement for electric automobile, characterized by: comprises the following steps:

a test rack (1);

the left side inside the test rack (1) is connected with the supporting block (2);

the testing motor (3) is connected inside the supporting block (2);

the tester (4) is connected to the left side inside the testing rack (1), the tester (4) is located on the right side of the supporting block (2), an output shaft of the testing motor (3) is connected with the tester (4), and the inside of the tester (4) can rotate;

the device comprises a supporting and adjusting mechanism (5), wherein the supporting and adjusting mechanism (5) for supporting an object to be tested is arranged on the right side in the testing rack (1), the supporting and adjusting mechanism (5) supports the object to be tested, the object to be tested is assisted to keep concentric height with a testing motor (3), and the supporting and adjusting mechanism (5) is in contact with a tester (4);

chucking mechanism (6), support adjustment mechanism (5) inside and be equipped with and be used for carrying out spacing chucking mechanism (6) to the determinand, chucking mechanism (6) move to the right and carry out the chucking to the determinand, prevent that the determinand can become flexible when detecting.

2. The drive motor testing device for the electric vehicle according to claim 1, wherein: the supporting and adjusting mechanism (5) comprises:

the test rack comprises guide rails (51), the guide rails (51) are symmetrically connected to the front and back of the right lower side in the test rack (1), and the left sides of the two guide rails (51) are connected with supporting blocks (2);

the right sides of the two guide rails (51) are connected with the sliding frame (53) in a sliding manner;

the right parts of the two guide rails (51) are sleeved with the first springs (52), and two ends of each first spring (52) are respectively connected with the inner wall of the test rack (1) and the right side of the sliding rack (53);

the sliding frame (53) is internally and slidably connected with the L-shaped baffle (54);

the bottom of the L-shaped baffle (54) and the inner bottom of the sliding frame (53) are connected with a second spring (56);

driving motor (55), driving motor (55) have been placed at L shape baffle (54) top, through putting driving motor (55) on L shape baffle (54), L shape baffle (54) are used for supporting driving motor (55), guarantee that driving motor (55) and test motor (3) height are concentric.

3. The drive motor testing device for the electric vehicle as claimed in claim 2, wherein: the chucking mechanism (6) includes:

the lower part of the L-shaped baffle (54) is symmetrically connected with the guide plate (61) in front and back, and the lower part of the driving motor (55) slides in the guide plate (61);

push pedal (62) and third spring (63), two deflector (61) inner wall left sides all are connected with through third spring (63) and are used for carrying on spacing push pedal (62) to driving motor (55), and two push pedal (62) right sides all contact with driving motor (55), move to the right through push pedal (62) and carry on spacingly to driving motor (55), prevent that driving motor (55) can become flexible when the test.

4. The drive motor testing device for the electric vehicle as claimed in claim 3, wherein: still including being used for carrying out positioning mechanism (7) to L shape baffle (54), positioning mechanism (7) including:

the middle of the bottom in the test rack (1) is connected with two positioning plates (71), and the upper right sides of the two positioning plates (71) are both in a tooth shape;

the U-shaped rods (72) are connected with the left lower side of the L-shaped baffle (54) in a front-back symmetrical sliding mode, the left side faces of the two U-shaped rods (72) are rough faces, the two U-shaped rods (72) are in contact with the adjacent positioning plates (71), the L-shaped baffle (54) is positioned through friction force between the U-shaped rods (72) and the positioning plates (71), and the driving motor (55) is prevented from shaking up and down during testing;

and the right sides of the two U-shaped rods (72) are connected with the inner part of the L-shaped baffle (54) through fourth springs (73), and the fourth springs (73) are connected with the inner parts of the two U-shaped rods (72).

5. The testing device for the driving motor of the electric automobile according to claim 4, characterized in that: still including being used for going on side fixed establishment (8) fixed to driving motor's (55) side, side fixed establishment (8) including:

the front side and the rear side of the upper part of the sliding frame (53) are both connected with wedge-shaped rods (81);

the front side and the rear side of the right part of the test rack (1) are symmetrically connected with the U-shaped connecting rod (83) in a sliding manner;

the buffer plates (82) are connected with the inner parts of the two U-shaped connecting rods (83);

the inner sides of the two U-shaped connecting rods (83) are sleeved with two fifth springs (84), and two ends of each fifth spring (84) are respectively connected with the buffer plate (82) and the inner wall of the test rack (1);

the upper parts of the two buffer plates (82) are connected with fixed clamping plates (85) used for fixing the side edges of the driving motor (55) in a sliding mode, and the fixed clamping plates (85) move towards the inner side to clamp and position the front side and the rear side of the driving motor (55);

the middle parts of the two fixing clamping plates (85) are sleeved with the two sixth springs (86), and two ends of each sixth spring (86) are respectively connected with the fixing clamping plates (85) and the buffer plate (82).

6. The drive motor testing device for the electric vehicle according to claim 5, wherein: still include guide mechanism (9) that is used for reducing the frictional force between driving motor (55) and fixed splint (85), guide mechanism (9) including:

the sliding blocks (92), four sliding blocks (92) are connected inside the two fixed clamping plates (85) in a sliding manner; the eight sliding blocks (92) are respectively and rotatably connected with a guide wheel (91) used for reducing the friction force between the driving motor (55) and the fixed clamping plate (85), the guide wheels (91) are driven to move towards the inner side through the fixed clamping plate (85) to be in contact with the driving motor (55), and the guide wheels (91) are used for reducing the friction force between the driving motor (55) and the fixed clamping plate (85);

and the seventh spring (93) is connected with the seventh spring (93) through the four sliding blocks (92) on the same fixed clamping plate (85) and the fixed clamping plate (85).

7. The drive motor testing device for the electric vehicle as claimed in claim 6, wherein: still include the counterpoint mechanism (10) that is used for auxiliary drive motor (55) and aligns with tester (4), counterpoint mechanism (10) including:

the upper side of the middle of the inner rear wall of the test rack (1) is connected with an alignment rod (101) used for aligning the auxiliary driving motor (55) and the tester (4);

the front side of the alignment rod (101) is connected with two limiting plates (102) in a sliding mode, the driving motor (55) is limited through the limiting plates (102), and the output shaft of the auxiliary driving motor (55) is accurately inserted into the tester (4);

the upper part of the front limiting plate (102) is sleeved with an eighth spring (103), the rear lower side of the alignment rod (101) is sleeved with the eighth spring (103), two ends of the upper eighth spring (103) are respectively connected with the front limiting plate (102) and the alignment rod (101), and two ends of the lower eighth spring (103) are respectively connected with the rear lower side of the rear limiting plate (102) and the rear lower side of the alignment rod (101);

the test rack comprises limiting blocks (104), the middle of the bottom in the test rack (1) is connected with the limiting blocks (104) used for limiting the limiting plates (102), and the limiting blocks (104) are located between the two limiting plates (102).

8. A method for testing a driving motor for an electric automobile comprises the following steps:

s1, ensuring that the motor axis of a driving motor (55) is concentric with the motor axis of a testing motor (3) in height when the motor axis is detected;

s2, the test motor (3) starts to operate to drive an output shaft of the drive motor (55) to rotate;

and S3, detecting the torque and the rotating speed of the driving motor (55) by the tester (4) so as to evaluate the mechanical performance of the driving motor (55).