CN111366741B - Rotation speed detection device of brushless direct current motor - Google Patents
Rotation speed detection device of brushless direct current motor Download PDFInfo
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- CN111366741B CN111366741B CN202010299435.6A CN202010299435A CN111366741B CN 111366741 B CN111366741 B CN 111366741B CN 202010299435 A CN202010299435 A CN 202010299435A CN 111366741 B CN111366741 B CN 111366741B
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- 230000006698 induction Effects 0.000 claims abstract description 53
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- 238000009434 installation Methods 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
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Abstract
The invention discloses a rotating speed detection device of a brushless direct current motor, which comprises a left end bracket, a right end bracket and a connecting mechanism, wherein a mounting plate is arranged between the left end bracket and the right end bracket, an electromagnet block is arranged on the mounting plate, a placing plate is arranged on the right end bracket, the connecting mechanism comprises a clamping sleeve, an adjusting column is arranged on the periphery of the clamping sleeve, a guide pillar is arranged at the top end of the clamping sleeve, a limiting block is arranged at the top end of the guide pillar, an induction block mounting block is arranged on the guide pillar, an induction block is fixedly arranged on one side of the upper end of the induction block mounting block, a magnetic block is embedded in the induction block mounting block, a laser generator is arranged on the left end bracket, and a laser receiver is arranged on the right end bracket; according to the invention, the actual rotating speed of the motor to be detected is calculated by blocking the times of the laser receiver receiving the laser emitted by the laser generator within the set time; and under the condition that like poles repel and opposite poles attract the magnetic blocks by utilizing the electromagnet blocks, detecting the rotating speed of the output shaft of the motor to be detected under the multi-condition simulation condition.
Description
Technical Field
The invention belongs to the field of brushless direct current motor speed measurement, and particularly relates to a rotating speed detection device of a brushless direct current motor.
Background
A brushless direct current motor (BLDCM) generally uses a three-phase hall signal at a motor end as a speed feedback signal for closed-loop control of the rotational speed. The motor rotates for one circle, the three-phase Hall has 6 jump signals, and the current motor rotating speed can be calculated by measuring the time difference of any two adjacent jump signals.
In the speed measuring mode, when the motor operates in a high-speed section, the motor performs speed closed-loop control, and the operation is smooth. However, when the motor runs in a low-speed section, the period of the jump of the Hall signal is prolonged, so that the speed feedback time is prolonged, the output delay of the speed closed-loop control occurs, the low-speed running of the motor is not smooth, and the disturbance rejection capability is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a rotating speed detection device of a brushless direct current motor, which solves the problems that the low-speed running of the brushless direct current motor is not smooth and the disturbance rejection capability is reduced due to the fact that a three-phase Hall signal is used as a speed feedback signal for measuring the speed of a motor to be measured in the prior art.
The aim of the invention can be achieved by the following technical scheme:
The utility model provides a brushless DC motor's rotational speed detection device, includes left end support, right-hand member support and top support, wherein through top support fixed connection between left end support and the right-hand member support top, be provided with the mounting panel between left end support and the right-hand member support, wherein be provided with the electromagnetic iron piece on the mounting panel, offered the arc hole that link up the mounting panel on the mounting panel.
The right-end support is provided with a placing plate support in sliding connection, and the bottom end of the placing plate support is fixedly provided with a placing plate.
The rotating speed detection device comprises a connecting mechanism, wherein the connecting mechanism comprises a clamping sleeve, adjusting holes distributed in an array are formed in the periphery of the clamping sleeve, internal threads are formed in the adjusting holes, adjusting columns are arranged in the adjusting holes, guide columns are arranged at the top ends of the clamping sleeve, the sections of the guide columns are polygonal, and limiting blocks are arranged at the top ends of the guide columns.
The guide pillar of the connecting mechanism is provided with an induction block installation block which vertically slides along the guide pillar, wherein one side of the upper end of the induction block installation block is fixedly provided with an induction block, and the induction block installation block is embedded with a magnetic block.
The left end support is provided with a laser generator, and the right end support is provided with a laser receiver, wherein when no obstruction exists between the laser generator and the laser receiver, the laser receiver receives laser emitted by the laser generator.
Further, the placing plate support is provided with a first driving rod which is connected through screw thread fit, wherein the first driving rod is fixedly connected with the output end of the first motor.
Further, the lower end of the clamping sleeve extends to the lower portion of the mounting plate, and meanwhile, a magnetic insulating layer is arranged on the outer wall of the clamping sleeve.
Further, the left end support deviates from the cylinder of right-hand member support one side fixed mounting mirror image distribution, and the telescopic link top of cylinder is all fixed mounting has the link, link and mounting panel fixed connection.
Further, the laser generator and the laser receiver are respectively positioned at the outer sides of the left end bracket and the right end bracket, and vertical emitting holes are formed in the left end bracket and the right end bracket.
Further, the laser generator and the laser receiver are fixedly arranged on the laser support, the laser support is in sliding connection with the corresponding left end support and right end support, the laser support is connected with a laser adjusting column which is connected through screw thread matching, and the laser adjusting column is in rotary connection with the corresponding left end support and right end support.
Further, fixing holes distributed in an array are formed in the guide posts, and meanwhile, positioning pins are fixedly arranged at the upper ends of the sensing block mounting blocks, and the positioning holes are formed in the positioning pins.
Further, the rotation speed detection device comprises a roughness preselection mechanism, wherein the roughness preselection mechanism comprises a roughness plate which moves horizontally, a roughness part is located below the sensing block installation block, a plurality of areas with different roughness are arranged on the roughness plate, a shifting chute is formed in the middle of the roughness plate, and a guide pillar penetrates through the shifting chute.
Further, a movable groove is formed in the left end support, a movable block sliding along the movable groove is arranged in the movable groove, and the movable block is fixedly connected with the roughness plate.
The movable block is connected with a roughness plate driving rod through threaded fit, and one end of the roughness plate driving rod is fixedly connected with the output end of a roughness plate driving motor.
Further, the using method of the rotating speed detecting device comprises the following steps:
the method comprises the steps that firstly, a motor to be tested is placed on a placing plate, a first motor drives a first driving rod to rotate, and the rotating first driving rod drives the placing plate to lift through a placing plate support, so that an output shaft of the motor to be tested penetrates through an arc-shaped hole;
secondly, sleeving the clamping sleeve on the top end of an output shaft of the motor to be tested, rotating the adjusting column to enable the adjusting column to extrude the output shaft of the motor to be tested, and enabling the clamping sleeve to be stably and coaxially fixed on the top end of the output shaft of the motor to be tested;
Thirdly, when the rotating speed of the motor to be tested under the condition of no load needs to be measured, the current direction of the electromagnet block is adjusted to enable the polarity of the electromagnet block to be the same as that of the magnetic block, the magnetic block drives the induction block mounting block to be in a specific height suspension state due to the repulsion of the magnetic block relative to the electromagnet block, the motor to be tested is started, the output shaft of the motor to be tested rotates to drive the induction block mounting block to rotate through the connecting mechanism, and the actual rotating speed of the motor to be tested is calculated by blocking the laser frequency of the laser receiver to be transmitted by the laser generator in a set time;
Fourthly, under the condition that a driving shaft of the motor to be tested is required to be hung and loaded, the driving shaft rotating speed of the motor to be tested is measured, the induction block mounting block and the guide post are integrated by utilizing bolts and nuts, according to the actual set hanging and loading weight, the magnet is attracted by the electromagnet by changing the corresponding current direction of the electromagnet, the attraction of the magnet to the magnet by the electromagnet is adjusted according to the current of the electromagnet, the adjustment of the attraction of the electromagnet to the magnet is realized, the driving shaft load weight of the motor to be tested by the induction block mounting block is further regulated, and under the condition that the driving shaft of the motor to be tested is hung and loaded with a specific weight, the rotating speed of the driving shaft of the motor to be tested is measured;
And fifthly, when the load is required to be placed under a specific roughness plane, under the condition that the driving shaft of the motor to be tested drives the load to rotate, namely, unloading the bolts and nuts on the positioning pins, and due to the attraction of the electromagnet block to the magnetic block, attaching the induction block mounting block to the roughness plate below, namely, supporting the induction block mounting block by the roughness plate, adjusting the current of the electromagnet block according to the load gravity condition set by actual needs, realizing the adjustment of the attraction of the electromagnet block to the magnetic block, further realizing the adjustment of the driving shaft load weight of the induction block mounting block to the motor to be tested, and under the condition that the driving shaft of the motor to be tested hangs the specific weight load, carrying out the load to be placed under the specific roughness plane, and under the condition that the driving shaft of the motor to be tested drives the load to rotate, measuring the driving shaft of the motor to be tested.
The invention has the beneficial effects that:
According to the invention, the actual rotating speed of the motor to be measured is calculated by blocking the laser times of the laser receiver receiving the laser emitted by the laser generator within a set time, so that the problems of unsmooth low-speed running and reduced disturbance rejection capability of the DC brushless motor caused by using a three-phase Hall signal as a speed feedback signal for measuring the speed of the motor to be measured are avoided;
meanwhile, the invention carries out the rotation speed detection under the multi-condition simulation of the output shaft of the motor to be tested under the condition that the like poles repel and the opposite poles attract the magnetic blocks by utilizing the electromagnet blocks.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a schematic overall structure of an embodiment of the present invention;
FIG. 2 is a schematic view of a structure with different viewing angles according to an embodiment of the present invention;
FIG. 3 is a schematic partial structure of an embodiment of the present invention;
FIG. 4 is an enlarged schematic view of the structure of FIG. 3 according to the embodiment of the present invention;
FIG. 5 is a schematic partial structure of an embodiment of the present invention;
Fig. 6 is a front view of fig. 5 in accordance with an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, a rotation speed detecting device of a brushless dc motor includes a left end bracket 10, a right end bracket 11 and a top end bracket 12, wherein the top ends of the left end bracket 10 and the right end bracket 11 are fixedly connected through the top end bracket 12;
as shown in fig. 3, a mounting plate 20 is arranged between the left end bracket 10 and the right end bracket 11, wherein an electromagnet block 21 is arranged on the mounting plate 20, and an arc-shaped hole 22 penetrating through the mounting plate 20 is formed on the mounting plate 20;
the right end bracket 11 is provided with a placing plate bracket 30 in sliding connection, wherein the bottom end of the placing plate bracket 30 is fixedly provided with a placing plate 31, the placing plate bracket 30 is provided with a first driving rod 32 in threaded fit connection, and the first driving rod 32 is fixedly connected with the output end of a first motor 33.
When in use, the motor to be tested is placed on the placing plate 31, the first motor 33 drives the first driving rod 32 to rotate, the rotating first driving rod 32 drives the placing plate 31 to lift through the placing plate bracket 30, and the output shaft of the motor to be tested passes through the arc-shaped hole 22.
As shown in fig. 4, the rotation speed detecting device of the present invention further includes a connection mechanism, wherein the connection mechanism includes a ferrule 40, an adjusting hole distributed in an array is formed on a peripheral side of the ferrule 40, an internal thread is formed in the adjusting hole, an adjusting column 41 is disposed in the adjusting hole, a guide column 42 is disposed at a top end of the ferrule 40, a section of the guide column 42 is polygonal, and a limit block 43 is disposed at a top end of the guide column 42.
When the device is used, after the motor to be tested is placed on the placing plate 31, the output shaft of the motor to be tested passes through the arc-shaped hole 22, the clamping sleeve 40 is sleeved on the top end of the output shaft of the motor to be tested, the adjusting column 41 is rotated, the adjusting column 41 is made to extrude the output shaft of the motor to be tested, the clamping sleeve 40 is stably fixed on the top end of the output shaft of the motor to be tested, and in order to enable the clamping sleeve 40 to be coaxial with the output shaft of the motor to be tested, the adjusting columns 41 are rotated to feed the clamping sleeve 40 together.
In this embodiment, the lower end of the clamping sleeve 40 extends to the lower side of the mounting plate 20, and meanwhile, a magnetic insulation layer is arranged on the outer wall of the clamping sleeve 40, so that the magnetic force generated by electrifying the electromagnet block 21 is prevented from adsorbing the output shaft of the motor to be tested, and the rotation speed of the output shaft of the actual motor to be tested is further affected.
The cylinder 50 that mirror image distribution is fixed to the side that left end support 10 deviates from right-hand member support 11, and the telescopic link top of cylinder 50 is all fixed mounting has link 51, link 51 and mounting panel 20 fixed connection.
In use, the air cylinder 50 drives the mounting plates 20 to move through the connecting frame 51, the mounting plates 20 are far away from each other or close to each other, and when the mounting plates 20 are far away from each other, the adjusting column 41 on the clamping sleeve 40 is convenient to rotate and adjust.
In this embodiment, an induction block mounting block 60 that vertically slides along the guide post 42 is disposed on the guide post 42 of the connection mechanism, where an induction block 61 is fixedly mounted on one side of the upper end of the induction block mounting block 60, and a magnetic block is mounted in the induction block mounting block 60.
The left end bracket 10 is provided with a laser generator 70, and the right end bracket 11 is provided with a laser receiver 71, wherein the laser receiver 71 receives laser light emitted by the laser generator 70 when there is no obstruction between the laser generator 70 and the laser receiver 71.
When the motor to be tested is actually used, the motor to be tested is started, the output shaft of the motor to be tested rotates to drive the sensing block mounting block 60 to rotate through the connecting mechanism, and when the sensing block mounting block 60 rotates to a light path between the laser receiver 71 and the laser generator 70, the sensing block 61 on the sensing block mounting block 60 stops the laser receiver 71 from receiving laser emitted by the laser generator 70 at the moment, namely, the blocking is equivalent to one circle of rotation of the output shaft of the motor to be tested, and the actual rotating speed of the motor to be tested is calculated by using the number of times of blocking the laser receiver 71 from receiving the laser emitted by the laser generator 70 in a set time.
When the rotation speed of the motor to be measured under the condition of no load needs to be measured, the connecting mechanism is integrally made of light materials, namely, in the actual detection process, the influence of the connecting mechanism on the output shaft load of the motor to be measured can be relatively not measured, at the moment, the electromagnet block 21 is started, the electromagnet block 21 forms an electromagnetic area on the upper area, the polarity of the electromagnet block 21 is the same as that of the magnetic block during the period, the magnetic block repels relative to the electromagnet block 21, the magnetic block drives the induction block mounting block 60 to be in a suspension state with a specific height, at the moment, the loads generated by the induction block mounting block 60, the induction block 61 and the magnetic block are relatively ignored, the heights of the laser generator 70 and the laser receiver 71 are regulated corresponding to the heights of the induction block 61 on the induction block mounting block 60, so that the heights of the optical paths of the laser generator 70 and the laser receiver 71 are kept consistent with the heights of the induction block 61, namely, the induction block 61 on the induction block mounting block 60 can be blocked, the output shaft of the motor to be measured is started, the rotation of the motor to be measured drives the induction block mounting block 60 to rotate through the connecting mechanism, and the actual rotation speed of the laser receiver 70 is calculated by using the set time, and the actual rotation speed of the laser generator 70 is blocked by the laser receiver 70.
In the present embodiment, the laser generator 70 and the laser receiver 71 are located outside the left end bracket 10 and the right end bracket 11, respectively, and the left end bracket 10 and the right end bracket 11 are provided with vertical radiation holes 101.
In use, the laser receiver 71 receives the laser light emitted from the laser generator 70 through the emission hole 101, and the laser generator 70 and the laser receiver 71 are respectively located at the outer sides of the left end bracket 10 and the right end bracket 11, so that when the electromagnet block 21 is started, interference of the electromagnetic area to the laser generator 70 and the laser receiver 71 is avoided.
The laser generator 70 and the laser receiver 71 are fixedly arranged on the laser support 72, wherein the laser support 72 is in sliding connection with the corresponding left end bracket 10 and right end bracket 11, the laser support 72 is connected with a laser adjusting column 73 which is in threaded fit connection, and the laser adjusting column 73 is in rotary connection with the corresponding left end bracket 10 and right end bracket 11; in use, by rotating the laser adjustment post 73, a corresponding adjustment of the relative heights of the laser generator 70 and the laser receiver 71 is performed.
In this embodiment, the guide posts 42 are provided with fixing holes distributed in an array, and the upper ends of the sensor block mounting blocks 60 are fixedly provided with positioning pins 601, wherein the positioning pins 601 are provided with positioning holes.
When the driving shaft of the motor to be tested is required to be hung under the load condition, the bolt and the nut fixedly mount the positioning pin 601 on the guide post 42, namely, the sensing block mounting block 60 and the guide post 42 are integrated, the driving shaft of the motor to be tested is measured under the condition that the driving shaft of the motor to be tested is hung under the load condition by changing the corresponding current direction of the electromagnet block 21 according to the actual setting, namely, changing the polarity of the electromagnet block 21, so that the electromagnet block 21 attracts the magnetic block, the adjustment of the attraction of the electromagnet block 21 to the magnetic block is realized according to the current of the electromagnet block 21, and then the adjustment of the driving shaft load weight of the motor to be tested by the sensing block mounting block 60 is realized.
As shown in fig. 5 and 6, in the present embodiment, the rotation speed detecting device further includes a roughness pre-selecting mechanism, wherein the roughness pre-selecting mechanism includes a roughness plate 80 that performs horizontal movement, wherein a roughness portion is located below the sensing block mounting block 60, wherein a plurality of areas with different roughness are provided on the roughness plate 80, wherein a displacement chute 81 is provided in the middle of the roughness plate 80, and the guide post 42 passes through the displacement chute 81.
When the load is required to be placed under a specific roughness plane, under the condition that the driving shaft of the motor to be tested drives the load to rotate, namely, the bolts and nuts on the positioning pins 601 are unloaded at the moment, the induction block mounting block 60 is attached to the roughness plate 80 below due to the attraction of the induction block 21 to the magnetic block, namely, the roughness plate 80 supports the induction block mounting block 60 (namely, the load is placed under the specific roughness plane), the current of the induction block 21 is adjusted according to the load gravity condition set by actual requirements, the attraction of the induction block 21 to the magnetic block is adjusted, and then the regulation of the weight of the induction block mounting block 60 to the driving shaft of the motor to be tested is realized, under the condition that the load is placed under the specific roughness plane and under the condition that the driving shaft of the motor to be tested drives the load to hang the specific weight load, the driving shaft of the motor to be tested is measured, and the rotation speed of the driving shaft of the motor to be tested is measured.
In this embodiment, the left end bracket 10 is provided with a movable slot 102, wherein a movable block sliding along the movable slot 102 is arranged in the movable slot 102, and the movable block is fixedly connected with the roughness plate 80;
The movable block is connected with a roughness plate driving rod 82 through screw thread fit, and one end of the roughness plate driving rod 82 is fixedly connected with the output end of a roughness plate driving motor 83.
When the sensor block is used, the roughness plate driving rod 82 is started according to actual needs, so that the roughness plate 80 horizontally moves, and the roughness of the contact surface at the lower end of the sensor block mounting block 60 is adjusted.
The using method comprises the following steps:
The first step, a motor to be tested is placed on a placing plate 31, a first motor 33 drives a first driving rod 32 to rotate, the rotating first driving rod 32 drives the placing plate 31 to lift through a placing plate bracket 30, and an output shaft of the motor to be tested passes through an arc-shaped hole 22;
Secondly, sleeving the clamping sleeve 40 on the top end of an output shaft of the motor to be tested, rotating the adjusting column 41 to enable the adjusting column 41 to squeeze the output shaft of the motor to be tested, and enabling the clamping sleeve 40 to be stably and coaxially fixed on the top end of the output shaft of the motor to be tested;
Thirdly, when the rotation speed of the motor to be tested under the no-load condition needs to be measured, the current direction of the electromagnet block 21 is adjusted to enable the polarity of the electromagnet block 21 to be the same as that of the magnetic block, the magnetic block drives the induction block mounting block 60 to be in a specific height suspension state due to the repulsion of the magnetic block relative to the electromagnet block 21, the motor to be tested is started, the output shaft of the motor to be tested rotates to drive the induction block mounting block 60 to rotate through the connecting mechanism, and the actual rotation speed of the motor to be tested is calculated by blocking the number of times of receiving laser emitted by the laser generator 70 by the laser receiver 71 in a set time;
fourth, when the driving shaft of the motor to be tested is required to be suspended for load, the driving shaft rotation speed of the motor to be tested is measured, the induction block mounting block 60 and the guide post 42 are integrated by using bolts and nuts, according to the actual set suspended load weight, the magnetic blocks are attracted by the electromagnet block 21 by changing the corresponding current direction of the electromagnet block 21, and according to the current size of the electromagnet block 21, the adjustment of the attraction size of the electromagnet block 21 to the magnetic blocks is realized, and then the driving shaft load weight of the motor to be tested by the induction block mounting block 60 is regulated, and when the driving shaft of the motor to be tested is suspended for a specific weight load, the driving shaft rotation speed of the motor to be tested is measured;
and fifthly, when the load is required to be placed under a specific roughness plane, under the condition that the driving shaft of the motor to be tested drives the load to rotate, namely, the bolts and nuts on the positioning pins 601 are unloaded at the moment, the induction block mounting block 60 is attached to the roughness plate 80 below due to the attraction action of the electromagnet block 21 on the magnetic block, namely, the roughness plate 80 supports the induction block mounting block 60 at the moment, according to the load gravity condition set by actual requirements, the current of the electromagnet block 21 is adjusted, the attraction of the electromagnet block 21 is adjusted, and then the driving shaft load weight of the motor to be tested by the induction block mounting block 60 is adjusted, under the condition that the driving shaft of the motor to be tested hangs the specific weight load, the load is placed under the specific roughness plane, and under the condition that the driving shaft of the motor to be tested drives the load to rotate, the driving shaft of the motor to be tested is measured, and the rotation speed of the driving shaft of the motor to be tested is measured.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (7)
1. The rotating speed detection device of the brushless direct current motor comprises a left end support (10), a right end support (11) and a top end support (12), wherein the top ends of the left end support (10) and the right end support (11) are fixedly connected through the top end support (12), and the rotating speed detection device is characterized in that a mounting plate (20) is arranged between the left end support (10) and the right end support (11), an electromagnet block (21) is arranged on the mounting plate (20), and an arc-shaped hole (22) penetrating through the mounting plate (20) is formed in the mounting plate (20);
a placing plate bracket (30) which is in sliding connection is arranged on the right end bracket (11), wherein a placing plate (31) is fixedly arranged at the bottom end of the placing plate bracket (30);
The rotating speed detection device comprises a connection mechanism, wherein the connection mechanism comprises a clamping sleeve (40), adjusting holes distributed in an array are formed in the periphery of the clamping sleeve (40), internal threads are formed in the adjusting holes, adjusting columns (41) are arranged in the adjusting holes, guide columns (42) are arranged at the top ends of the clamping sleeve (40), the section of each guide column (42) is polygonal, and limiting blocks (43) are arranged at the top ends of the guide columns (42);
An induction block mounting block (60) which vertically slides along the guide column (42) is arranged on the guide column (42) of the connecting mechanism, an induction block (61) is fixedly arranged on one side of the upper end of the induction block mounting block (60), and a magnetic block is embedded in the induction block mounting block (60);
the left end bracket (10) is provided with a laser generator (70), the right end bracket (11) is provided with a laser receiver (71), and the laser receiver (71) receives laser emitted by the laser generator (70) when no obstruction exists between the laser generator (70) and the laser receiver (71);
The placing plate bracket (30) is provided with a first driving rod (32) which is connected through screw thread fit, wherein the first driving rod (32) is fixedly connected with the output end of a first motor (33);
The rotating speed detection device comprises a roughness preselection mechanism, wherein the roughness preselection mechanism comprises a roughness plate (80) which moves horizontally, a roughness part is positioned below an induction block mounting block (60), a plurality of areas with different roughness are arranged on the roughness plate (80), a shifting chute (81) is formed in the middle of the roughness plate (80), and a guide pillar (42) penetrates through the shifting chute (81);
a movable groove (102) is formed in the left end support (10), a movable block sliding along the movable groove (102) is arranged in the movable groove (102), and the movable block is fixedly connected with the roughness plate (80);
the movable block is connected with a roughness plate driving rod (82) through threaded fit, and one end of the roughness plate driving rod (82) is fixedly connected with the output end of a roughness plate driving motor (83).
2. A device for detecting the rotational speed of a brushless dc motor according to claim 1, wherein the lower end of the ferrule (40) extends below the mounting plate (20), while the outer wall of the ferrule (40) is provided with a magnetically insulating layer.
3. The rotating speed detection device of the brushless direct current motor according to claim 1, wherein a cylinder (50) in mirror image distribution is fixedly arranged on one side of the left end support (10) away from the right end support (11), connecting frames (51) are fixedly arranged on the top ends of telescopic rods of the cylinder (50), and the connecting frames (51) are fixedly connected with the mounting plate (20).
4. The rotation speed detection device of a brushless direct current motor according to claim 1, wherein the laser generator (70) and the laser receiver (71) are respectively located at the outer sides of the left end bracket (10) and the right end bracket (11), and vertical radiation holes (101) are formed in the left end bracket (10) and the right end bracket (11).
5. The device for detecting the rotation speed of the brushless direct current motor according to claim 4, wherein the laser generator (70) and the laser receiver (71) are fixedly installed on the laser support (72), the laser support (72) is slidably connected with the corresponding left end bracket (10) and right end bracket (11), the laser support (72) is connected with a laser adjusting column (73) which is connected through screw thread matching, and the laser adjusting column (73) is rotatably connected with the corresponding left end bracket (10) and right end bracket (11).
6. The device for detecting the rotation speed of the brushless direct current motor according to claim 1, wherein the guide posts (42) are provided with fixing holes distributed in an array, and meanwhile, a positioning pin (601) is fixedly arranged at the upper end of the sensing block mounting block (60), and the positioning pin (601) is provided with a positioning hole.
7. A rotational speed detecting apparatus for a brushless dc motor according to any one of claims 1 to 6, wherein the rotational speed detecting apparatus comprises:
firstly, placing a motor to be tested on a placing plate (31), driving a first driving rod (32) to rotate by a first motor (33), and driving the placing plate (31) to lift by the rotating first driving rod (32) through a placing plate bracket (30), so that an output shaft of the motor to be tested passes through an arc-shaped hole (22);
Secondly, sleeving a clamping sleeve (40) on the top end of an output shaft of the motor to be tested, rotating an adjusting column (41) to enable the adjusting column (41) to squeeze the output shaft of the motor to be tested, and enabling the clamping sleeve (40) to be stably and coaxially fixed on the top end of the output shaft of the motor to be tested;
Thirdly, when the rotating speed of the motor to be tested under the condition of no load needs to be measured, the current direction of the electromagnet block (21) is adjusted to enable the polarity of the electromagnet block (21) to be the same as that of the magnetic block, the magnetic block drives the induction block mounting block (60) to be in a specific height suspension state due to the repulsion of the magnetic block relative to the electromagnet block (21), the motor to be tested is started, the output shaft of the motor to be tested rotates to drive the induction block mounting block (60) to rotate through the connecting mechanism, and the actual rotating speed of the motor to be tested is calculated by blocking the laser times of the laser receiver (71) receiving the laser emitted by the laser generator (70) within a set time;
Fourthly, when the driving shaft of the motor to be tested is required to be hung and loaded, the driving shaft rotating speed of the motor to be tested is measured, the induction block mounting block (60) and the guide pillar (42) are integrated by utilizing bolts and nuts, the corresponding current direction of the electromagnet block (21) is changed according to the actual set hanging and loading weight, the electromagnet block (21) is attracted, the attraction of the electromagnet block (21) to the magnet block is adjusted according to the current size of the electromagnet block (21), the adjustment of the attraction of the electromagnet block (21) to the magnet block is realized, and then the driving shaft rotating speed of the motor to be tested is measured under the conditions that the induction block mounting block (60) is used for adjusting the driving shaft loading weight of the motor to be tested and the driving shaft of the motor to be tested is hung and loaded with specific weight;
And fifthly, when a load is required to be placed under a specific roughness plane, under the condition that a driving shaft of a motor to be tested drives the load to rotate, namely, a bolt and a nut on a positioning pin (601) are unloaded at the moment, due to the suction action of an electromagnet block (21) on a magnetic block, an induction block mounting block (60) is attached to a roughness plate (80) below, namely, the roughness plate (80) supports the induction block mounting block (60) at the moment, and according to the load gravity condition set by actual requirements, the current of the electromagnet block (21) is adjusted, so that the suction of the electromagnet block (21) on the magnetic block is adjusted, and further, the driving shaft weight of the motor to be tested is adjusted by the induction block mounting block (60), and under the condition that the driving shaft of the motor to be tested hangs a specific weight load, the load is placed under the specific roughness plane, and under the condition that the driving shaft of the motor to be tested drives the load, the driving shaft of the motor to be tested is rotated, and the driving shaft of the motor to be tested is measured.
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| CN111929463B (en) * | 2020-08-20 | 2021-03-26 | 湖南东方红机电制造有限公司 | Full-automatic motor rotation speed detector of self-adaptation model size |
| CN112033718B (en) * | 2020-09-07 | 2023-03-07 | 江苏理工学院 | Brushless fan quality and performance testing device and testing method |
| CN112666499B (en) * | 2020-12-16 | 2022-08-12 | 国网江苏省电力有限公司徐州供电分公司 | Monitor circuit ground switch contact failure alarm device |
| CN112986606B (en) * | 2021-03-11 | 2023-07-25 | 铜陵有色金属集团股份有限公司工程技术分公司 | Fan speed and acceleration tester |
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| CN204705652U (en) * | 2015-04-20 | 2015-10-14 | 李公君 | Slowspeed machine rotation-speed measuring device special in Aulomatizeted Detect work |
| CN206077265U (en) * | 2016-09-24 | 2017-04-05 | 皖西学院 | A kind of brushless direct current motor controller based on DSP |
| CN109975574A (en) * | 2019-04-18 | 2019-07-05 | 贵州民族大学 | A kind of small propeller rotation-speed measuring device and its measurement method |
| CN110174653A (en) * | 2019-05-17 | 2019-08-27 | 南京理工大学 | A kind of millimeter wave test table that portable revolving speed is remote-controlled |
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