ELECTRIC MOTOR BRAKING PERFORMANCE TESTING DEVICE

Abstract

The present invention relates to a motor braking performance testing device, comprising: a motor positioning mechanism, a linkage mechanism, a power supply, a speed detection module, a timing module, a standard data storage module, a data comparison module, a test result output module, and a control module. The power supply, the speed detection module, the timing module, the standard data storage module, the data comparison module and the test result output module are all electrically connected to the control module. The present invention has the advantages that the device can test the braking performance of high-speed motors such as motors of lawn mowers, and make test results more accurate.

Claims

1. A motor braking performance testing device, comprising: a motor positioning mechanism configured to position and fix a motor under test; a linkage mechanism comprising a linkage shaft for linkage with an output shaft of the motor under test and a simulation load for linkage with the linkage shaft; a power supply for powering the motor under test; a speed detection module provided on the linkage shaft for measuring the speed of the output shaft of the motor under test; a timing module configured to count time T.sub.1 from the moment when the motor under test receives a braking signal to the moment when the output shaft stops rotating completely; a standard data storage module configured to store standard default time T.sub.0 from the moment when the motor under test receives the braking signal to the moment when the output shaft stops rotating completely; a data comparison module configured to compare the time T.sub.1 obtained by the timing module with the default time T.sub.0; a test result output module which outputs different results based on comparison results of the data comparison module, such as a result that the braking performance of the motor under test is qualified if the T.sub.1 is less than the T.sub.0, or a result that the braking performance of the motor under test is unqualified; and a control module configured to control the start-up and braking of the motor under test, wherein the power supply, the speed detection module, the timing module, the standard data storage module, the data comparison module and the test result output module are all electrically connected to the control module.

2. The motor braking performance testing device according to claim 1, wherein the simulation load comprises a simulation blade fixed to the linkage shaft at the simulation blade's middle, and cover pieces each forming an included angle with the simulation blade are provided on the simulation blade.

3. The motor braking performance testing device according to claim 2, wherein the two cover pieces, each provided on one of front and rear sides of the simulation blade, are located at opposite ends of the simulation blade, respectively, and are provided symmetrically along an axis of the linkage shaft.

4. The motor braking performance testing device according to claim 1, wherein the speed detection module comprises a rotary encoder provided on the linkage shaft.

5. The motor braking performance testing device according to claim 1, wherein the motor positioning mechanism comprises a fixed mount and a mounting plate, guide grooves for shipper rods to run through are provided on left and right sides of the fixed mount, and a recess groove for receiving the output shaft of the motor under test is provided in the middle of the fixed mount; one end of the shipper rod is linked with an output end of a driver, while the other end is fixed to a pressure plate, and the drivers and the pressure plates are fixed to front and rear sides of the fixed mount, respectively; a pocketing groove for receiving the output shaft of the motor under test is provided in the middle of the mounting plate, the mounting plate is provided with mounting holes which correspond to the motor under test and are fitted to fasteners, and hold-down grooves, which open downward and are wider than the pressure plate, are provided on left and right sides of the mounting plate, respectively.

6. The motor braking performance testing device according to claim 1, wherein the pressure plate is provided with a tapered bulge extending to the fixed mount, and the mounting plate is provided with tapered open grooves fitted to the tapered bulges.

7. The motor braking performance testing device according to claim 1, wherein locating pieces are provided on a rear side of the fixed mount, a retaining nest running vertically is formed between the locating piece and the fixed mount, and an opening at an upper end of the retaining nest has a width gradually decreasing from top to bottom.

8. The motor braking performance testing device according to claim 5, wherein the recess groove has a width gradually increasing from bottom to top, and runs upward through the fixed mount.

9. The motor braking performance testing device according to claim 5, wherein a bar-type slot extending transversely runs longitudinally through an upper end of the mounting plate and is located in the middle of the mounting plate.

10. A testing method for the motor braking performance testing device according to claim 1, comprising following steps of: S1, placing the motor under test on the testing device, linking the output shaft of the motor under test with the linkage shaft of the linkage mechanism, and starting up the motor under test by the control module; S2, when the speed of the output shaft of the motor under test reaches a rated speed, sending, by the control module, a braking signal to control the motor to brake, starting up the timing module to count time at the same time; when the output shaft of the motor under test stops rotating completely, stopping the timing module, obtaining, by the timing module, time T.sub.1 from the moment when the motor under test receives the braking signal to the moment when the output shaft stops rotating completely, and transmitting the time T.sub.1 to the data comparison module; S3, comparing, by the data comparison module, the time T.sub.1 obtained by the timing module with the standard default time T.sub.0; and S4, outputting, by the test result output module, different results based on comparison results of the data comparison module, such as a result that the braking performance of the motor under test is qualified if the T.sub.1 is less than the T.sub.0, or a result that the braking performance of the motor under test is unqualified.

11. The motor braking performance testing device according to claim 7, wherein the recess groove has a width gradually increasing from bottom to top, and runs upward through the fixed mount.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a structural diagram according to the present invention;

[0023] FIG. 2 is a structural diagram of a motor positioning mechanism and a linkage mechanism according to the present invention;

[0024] FIG. 3 is a structural diagram when a motor under test is fixed to the motor positioning mechanism according to the present invention;

[0025] FIG. 4 is a structural diagram of the motor positioning mechanism according to the present invention;

[0026] FIG. 5 is a structural diagram of a mounting plate according to the present invention;

[0027] FIG. 6 is a structural diagram of a driver according to the present invention; and

[0028] FIG. 7 is a functional block diagram according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention will be further described as below with reference to the accompanying drawings by embodiments.

[0030] As shown in FIGS. 1 to 7, a motor braking performance testing device is provided in the present invention, comprising a motor positioning mechanism 100, and a linkage mechanism 200. The motor positioning mechanism 100 is configured to position and fix a motor 9 under test, and the linkage mechanism 200 comprises a linkage shaft 21 for linkage with an output shaft 91 of the motor 9 under test and a simulation load for linkage with the linkage shaft 21. The device further comprises a power supply for powering the motor 9 under test, a speed detection module for measuring the speed of the output shaft 91 of the motor 9 under test, a timing module configured to count time T.sub.1 from the moment when the output shaft 91 of the motor 9 under test receives a braking signal to the moment when the output shaft 91 stops rotating completely, a standard data storage module configured to store standard default time T.sub.0 from the moment when the output shaft 91 of the motor 9 under test receives the braking signal to the moment when the output shaft 91 stops rotating completely, a data comparison module configured to compare the time T.sub.1 obtained by the timing module with the default time T.sub.0, a test result output module configured to output results, and a control module configured to control the start-up and braking of the motor 9 under test. The power supply, the speed detection module, the timing module, the standard data storage module, the data comparison module and the test result output module are all electrically connected to the control module.

[0031] As shown in FIG. 2, the simulation load comprises a simulation blade 31 fixed to the linkage shaft 21 at its middle, and cover pieces 32 each forming an included angle of 90 degrees with the simulation blade 31 are provided on the simulation blade 31. The two cover pieces 32, each provided on one of front and rear sides of the simulation blade 31, are located at opposite ends of the simulation blade 31, respectively, and are provided symmetrically along an axis of the linkage shaft 21.

[0032] As shown in FIG. 2, the speed detection module comprises a rotary encoder 41 provided on the linkage shaft 21. The linkage shaft 21 is linked with the output shaft 91 of the motor 9 under test through a coupling 22.

[0033] As shown in FIGS. 2 to 4, the motor positioning mechanism 100 comprises a fixed mount 1 and a mounting plate 5. Guide grooves for shipper rods 11 to run through are provided on left and right sides of the fixed mount 1, and a recess groove 12 for receiving the output shaft 91 of the motor 9 under test is provided in the middle of the fixed mount 1. One end of the shipper rod 11 is linked with an output end of a driver 13, while the other end is fixed to a pressure plate 15, and the drivers 13 and the pressure plates 15 are fixed to front and rear sides of the fixed mount 1, respectively. Locating pieces 16 are provided on a rear side of the fixed mount 1, a retaining nest 17 running vertically is formed between the locating piece 16 and the fixed mount 1, and an opening at an upper end of the retaining nest 17 has a width gradually decreasing from top to bottom. The recess groove 12 has a width gradually increasing from bottom to top, and runs upward through fixed mount 1.

[0034] As shown in FIGS. 2, 3 and 5, a pocketing groove 51 for receiving the output shaft 91 of the motor 9 under test is provided in the middle of the mounting plate 5, the mounting plate 5 is provided with mounting holes 52 which correspond to the motor 9 under test and are fitted to fasteners, and hold-down grooves 53, which open downward and are wider than the pressure plate 15, are provided on left and right sides of the mounting plate 5, respectively. A bar-type slot extending transversely runs longitudinally through an upper end of the mounting plate 5 and is located at in the middle of the mounting plate 5. As shown in FIGS. 5 and 6, the pressure plate 15 is provided with a tapered bulge 14 extending to the fixed mount 1, and the mounting plate 5 is provided with tapered open grooves 54 each fitted to the tapered bulges 14.

[0035] As shown in FIG. 1, the test result output module in this embodiment comprises alarm lights 61, the standard data storage module comprises a touch screen 62, and the control module comprises buttons 63 to control the on and off of the power. The touch screen 62 is configured to input the standard default time T.sub.0, and also to display T.sub.1, real-time speed, and other values.

[0036] In this embodiment, a motor braking performance testing method for the motor braking performance testing device is further disclosed, comprising following steps S1 to S4.

[0037] In the step S1, the motor under test is placed on the testing device, the output shaft of the motor under test is linked with the linkage shaft of the linkage mechanism, and the motor under test is started up by the control module.

[0038] In the step S2, when the speed of the output shaft of the motor under test reaches a rated speed, the control module sends a braking signal to control the motor to brake, and the timing module starts to count time at the same time. When the output shaft of the motor under test stops rotating completely, the timing module stops, obtains time T.sub.1 from the moment when the motor under test receives the braking signal to the moment when the output shaft stops rotating completely, and transmits the time T.sub.1 to the data comparison module.

[0039] In the step S3, the data comparison module compares the time T.sub.1 obtained by the timing module with the standard default time T.sub.0.

[0040] In the step S4, the test result output module outputs different results based on comparison results of the data comparison module, such as a result that the braking performance of the motor under test is qualified if the T.sub.1 is less than the T.sub.0, or a result that the braking performance of the motor under test is unqualified.

[0041] With the above method, the motor braking performance of a lawn mower is tested. The rated speed of the motor 9 under test is 3,000 rpm, and the T.sub.0 is 1.5 S.

[0042] During testing, the motor 9 under test is placed on the motor positioning mechanism 100 and powered to start up by the control module with a PLC, the output shaft 91 of the motor 9 under test drives the rotary encoder 41 to rotate by the coupling 22 and the linkage shaft 21, a real-time speed can be displayed by the touch screen 62 through the functions of the rotary encoder 41 and the PLC itself. When the real-time speed reaches the rated speed, the motor 9 under test is powered off by the control module. Because of the braking function of the motor 9 under test, the output shaft 91 of the motor 9 under test stops rotating quickly. The time from the moment when the motor 9 under test receives the power-off braking signal the moment when the output shaft 91 stops rotating completely is T.sub.1, which is 1.6 S. The data comparison module compares the time T.sub.1 obtained by the timing module with the standard default time T.sub.0. Because the T.sub.1 is greater than the T.sub.0, the alarm lights 61 of the test result output module light up and alarm, thus indicating that the motor braking performance is unqualified.

[0043] After the speed of the output shaft 91 of the motor 9 under test reaches the rated speed, the motor 9 under test can be set manually by a tester so that the control module automatically controls the motor 9 under test to stop operating after the motor 9 under test is started up for operation for T.sub.2. The output shaft 91 of the motor 9 under test may be stopped by cutting off power, and may also be stopped by sending a standby is command and in other ways, so as to test the braking performance of the motor 9 under test. Those of skill in the art can edit the program according to the actual needs, so that the control module with the PLC can realize the above functions.

[0044] The present invention has the advantages that the device can test the braking performance of high-speed motors such as motors of lawn mowers, and make test results more accurate.