CN114608734A

CN114608734A - Novel dynamometer and dynamometer method thereof

Info

Publication number: CN114608734A
Application number: CN202210279518.8A
Authority: CN
Inventors: 瞿广莉
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2022-06-10

Abstract

The invention discloses a novel dynamometer and a dynamometer method thereof. The top of the motor mounting seat is provided with a motor mounting groove, the left end of the transmission shaft is connected with a motor shaft of a tested motor through a coupler, the right end of the transmission shaft is connected with a magnetic steel rotor, and the magnetic steel rotor rotates coaxially with the tested motor at the same speed through the transmission shaft. And a rotating speed sensor is also arranged below the transmission shaft, is fixed on the bearing support and is used for measuring the rotating speed of the transmission shaft. The metal cylinder is arranged at the end of the torque sensor adjacent to the magnetic steel rotor, so that the magnetic steel rotor can be sleeved into the metal cylinder by the metal cylinder, and the torque force on the metal cylinder is measured by the torque sensor. Torque is indirectly transmitted to a static torque sensor without loss to acquire torque data, so that the static torque sensor has higher precision and lower manufacturing cost.

Description

Novel dynamometer and dynamometer method thereof

Technical Field

The invention relates to the technical field of motors, in particular to a novel dynamometer and a dynamometer method thereof.

Background

High speed motors have great advantages in both power density and operating efficiency. At present, high-speed motors above 2Wrpm and ultra-high-speed motors above 10Wrpm are increasingly popularized in various industries, and are generally applied to household appliances such as new energy automobile motors, mini-sized dust collectors and hair dryers and the like and the field of military aerospace medical treatment. However, for measuring and evaluating the characteristics of the motor, a dynamometer is required to be used for actual data test, wherein torque data is collected, no matter in the current mainstream dynamometers, no matter hysteresis dynamometer, eddy current dynamometer and other dynamometer equipment adopt a dynamic torque sensor (the dynamic torque sensor means that a shaft of the torque sensor rotates along with the motor at the same speed) for torque value collection, and the measurement requirement under high rotating speed cannot be met because the dynamic torque sensor is limited by the rotational inertia, the mechanical structure and the like.

Disclosure of Invention

The invention mainly aims to design a dynamometer for a high-rotating-speed motor, and meets the requirement of accurately measuring the power of the motor at a higher rotating speed.

The utility model provides a novel dynamometer, includes the rack and installs motor mount pad, bearing bracket, transmission shaft, slide rail on the rack from a left side to the right side in proper order, torque sensor mounting panel, torque sensor servo motor and data tester. The motor mounting seat is fixed on the rack, and the top of the motor mounting seat is provided with a motor mounting groove for mounting and fixing a tested motor. The bearing support is fixed on the rack and located at the right end of the motor mounting seat, and the transmission shaft is mounted on the bearing support through a bearing at the top of the bearing support. The left end of the transmission shaft is connected with a motor shaft of the tested motor through a coupler, the right end of the transmission shaft is connected with a magnetic steel rotor, and the magnetic steel rotor and the tested motor rotate coaxially at the same speed through the transmission shaft. And a rotating speed sensor is also arranged below the transmission shaft, is fixed on the bearing support and is used for measuring the rotating speed of the transmission shaft. The slide rail is installed at the bearing bracket right-hand member, set up slidable slider on the slide rail, torque sensor mounting panel bottom is fixed with the slider, can follow the slide rail with the slider and slide together, the horizontal lead screw of placing of still fixedly connected with on the torque sensor mounting panel, torque sensor is fixed at torque sensor mounting panel top, torque sensor and magnet steel rotor adjacent end installation metal cylinder, make the metal cylinder can with the magnet steel rotor telescope section of thick bamboo in, measure the torsion on the metal cylinder that the electromagnetic eddy current resistance that produces when the magnet steel rotor is rotatory with the metal cylinder forms by torque sensor. The front end of the screw rod is connected with the servo motor, and the rotary motion of the servo motor is changed into the transverse linear motion of the screw rod. The screw rod, the torque sensor mounting plate, the torque sensor, the sliding block and the metal cylinder form an integral moving assembly A, and the integral moving assembly A is controlled to transversely move on the sliding rail under the connecting action of the screw rod and the servo motor. The servo motor is fixed with the rack through the servo motor mounting plate.

The top of the motor mounting seat is also provided with a motor pressing plate, and the motor to be tested is fastened after the motor to be tested is mounted and fixed.

And the sensor data line of the torque sensor and the sensor data line of the rotating speed sensor are electrically connected with an external data tester. The data tester calculates the data acquired by the sensor by the CPU of the data tester to obtain a corresponding test result.

During testing, a tested motor is arranged on the motor mounting seat, the tested motor drives the magnetic steel rotor to rotate, and the rotating speed n of the tested motor is measured by the rotating speed sensor; drive whole motion subassembly A lateral sliding through servo motor, make the metal cylinder on it embolia the magnet steel rotor gradually, measure the torsion T on the metal cylinder that the electromagnetic eddy resistance that produces with the metal cylinder formed when the magnet steel rotor is rotatory by torque sensor, at each test point, the degree of depth L that the record magnet steel rotor embolias the metal cylinder (the metal cylinder embolias the degree of depth L of magnet steel rotor different, the hysteresis lag eddy resistance that produces is different), the numerical value of record torque sensor simultaneously, the voltage value U of record surveyed electricity terminal, the current value I of record surveyed electricity terminal, then according to the formula:

and P input = U I, P output = T n/9.55, and data such as motor output power and motor efficiency are calculated.

The invention indirectly transmits the torque to a static torque sensor without loss to acquire torque data by generating electromagnetic eddy current resistance through the rotor magnetic steel and the metal sleeve which have the same speed as the motor, so that the static torque sensor has higher precision and lower manufacturing cost and is not influenced by the rotating speed of the motor, thereby being capable of supporting the unlimited rotation speed of the motor to be tested and having great application prospect.

Drawings

FIG. 1 is a schematic diagram of a novel dynamometer; FIG. 2 is a diagram of an electrical configuration of a data tester;

FIG. 3 is a structural diagram of an initial state of a novel dynamometer; FIG. 4 is a structural diagram of a test state of the novel dynamometer;

wherein the reference numbers: the device comprises a tested motor 1, a motor shaft 2, a coupler 3, a bearing support 4, a bearing 5, a transmission shaft 6, a magnetic steel rotor 7, a metal cylinder 8, a screw 9, a torque sensor 10, a torque sensor mounting plate 11, a sensor data line 12, a lead screw 13, a servo motor mounting plate 14, a servo motor 15, a slider 16, a slide rail 17, a table frame 18, a rotating speed sensor 19, a motor mounting seat 20, a motor pressing plate 21 and a data tester 22.

Detailed Description

The invention is further described with reference to the following specific embodiments and the accompanying drawings. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.

Example (b): a novel dynamometer is shown in fig. 1 and comprises a rack 18, a motor mounting seat 20 mounted on the rack, a transmission shaft assembly, a torsion sensor assembly, a servo motor 15 and a data tester 22. The bottom of the motor mounting seat 20 is fixed with the rack, the top of the motor mounting seat is provided with a motor mounting groove used for mounting the tested motor 1, and a motor pressing plate 21 is arranged and mounted to compress and fix the tested motor 1. The motor pressing plate 21 can be fixed with the motor mounting base 20 by screws. The transmission assembly comprises a coupler 3, a bearing support 4 and a transmission shaft 6, the bottom of the bearing support 4 is fixed on a rack 18, the top of the bearing support is provided with a bearing 5, the transmission shaft 6 is fixed on the bearing support 4 through the bearing 5, the transmission shaft 6 is connected with a motor shaft 2 of a tested motor 1 through the coupler 3, the other end of the transmission shaft 6 is connected with a magnetic steel rotor 7, and the coaxial same-speed rotary connection of the tested motor 1 and the magnetic steel rotor 7 is formed. The lower end of the transmission shaft 6 is also provided with a rotating speed sensor 19 which is fixed on the bearing bracket and used for measuring the rotating speed of the transmission shaft 6, namely measuring the rotating speed of the tested motor 1. And a torque sensor assembly is arranged at the other end of the magnetic steel rotor 7. The torsion sensor assembly is a translational assembly and comprises a metal cylinder 8, a torsion sensor mounting plate 11, a torsion sensor 10, the metal cylinder 8, a sliding block 16, a sliding rail 17 and a screw rod 13. The slide rails 17 and the slide blocks 16 are a pair of slide rail assemblies, the slide rails 17 are fixed on the rack 18, and the slide blocks 16 are installed on the slide rails and can move horizontally along the slide rails. A torsion sensor mounting plate 11 is fixed on the sliding block 16, a torsion sensor 10 is mounted at the top of the torsion sensor mounting plate 11 and fixed through a mounting screw 9, and a transversely arranged screw rod 13 is connected to the middle of the torsion sensor mounting plate 11. The front end of the torque sensor 10 is provided with a metal cylinder 8, the metal cylinder 8 is adjacent to the magnetic steel rotor 7, and the height position of the metal cylinder 8 can be just sleeved into the magnetic steel rotor 7. The tail of the screw rod 13 is connected with a servo motor 15, the servo motor 15 controls the screw rod to move, the servo motor 15 is fixed with a rack 18 through a servo motor mounting plate 14, and a power line of the servo motor 15 is led out and connected with an external power supply. The torque sensor assembly can translate left and right along the slide rail 17, the depth of the metal cylinder 8 sleeved into the magnetic steel rotor 7 is controlled through translation, and the translation distance is completed by driving the screw rod 13 through the servo motor 15. The servo motor 15 changes the rotary motion into the transverse linear motion of the screw rod 13, and pushes the whole torsion sensor assembly to translate.

The sensor data line 12 of the torque sensor 10 and the data line of the rotation speed sensor are electrically connected to an external data tester 22. As shown in fig. 2, the data tester is connected to the power supplies of the tested motor 1 and the servo motor 15 through the switch control circuit to perform the switch control function, the input current of the tested motor 1 is measured through the current sensor, and the data collected by the input rotation speed sensor 19 and the input torque sensor 10 is calculated by the internal CPU to obtain the corresponding test result. The data tester adopts a low-cost 8-bit or 16-bit singlechip, and can realize the required data testing and calculating functions and control the on-off of the tested motor and the servo motor by matching with a corresponding power supply module, an A/D module, a switch circuit control module and software programming.

The dynamometer method of the dynamometer comprises the following steps: the tested motor 1 is arranged on the motor mounting seat 20, the tested motor 1 drives the magnetic steel rotor 7 to rotate, and the rotating speed n of the motor is measured by the rotating speed sensor 19. The torque sensor assembly is driven by the servo motor 14, so that the metal cylinder 8 on the torque sensor assembly is gradually sleeved into the magnetic steel rotor 7 as shown in the states of fig. 3 to 4. Torque T on metal cylinder 8 formed by torque sensor 10 measuring the electromagnetic eddy current resistance generated by magnetic steel rotor 7 when it rotates with metal cylinder 8, at each test point, i.e. different depth L of metal cylinder 8 sleeving magnetic steel rotor 7, the hysteresis eddy current resistance generated is different, the numerical value of torque sensor 10, the voltage value U of the end of the tested electric machine, the current value I of the end of the tested electric machine are recorded, then according to the formula:

p input = U × I, P output = T × n/9.55, and data such as motor output power and motor efficiency are calculated.

The novel dynamometer is used for rotatably generating electromagnetic eddy current resistance by arranging a magnetic steel rotor sleeved with a metal cylinder and having the same speed as a motor to be tested, indirectly transmitting torque without loss to a static torque sensor, acquiring torque data, realizing static acquisition of torque values and realizing high-precision data acquisition of the motor at high rotating speed. The novel multifunctional electric heating cooker is simple in structure, low in production cost, suitable for popularization and promising in market prospect.

Claims

1. The novel dynamometer is characterized by comprising a rack (18), a motor mounting seat (20), a bearing support (4), a transmission shaft (6), a sliding rail (17), a torsion sensor mounting plate (11), a torsion sensor (10), a servo motor (15) and a data tester (22), wherein the motor mounting seat (20) is sequentially mounted on the rack, the motor mounting groove is formed in the top of the motor mounting seat (20) and used for fixing a tested motor (1); the bearing support (4) is fixed on the rack (18) and located at the right end of the motor mounting seat (20), the transmission shaft (6) is mounted on the bearing support (4) through the bearing (5), the left end of the transmission shaft (6) is connected with the motor shaft (2) of the tested motor (1) through the coupler (3), the right end of the transmission shaft (6) is connected with the magnetic steel rotor (7), the magnetic steel rotor (7) and the tested motor (1) coaxially rotate at the same speed through the transmission shaft (6), and the rotating speed sensor (19) is mounted below the transmission shaft (6); the sliding rail (17) is arranged at the right end of the bearing support (4), a sliding block (16) is arranged on the sliding rail, and the bottom of the torsion sensor mounting plate (11) is fixed with the sliding block (16) and can slide along the sliding rail (17); a torque sensor (10) is fixed at the top of the torque sensor mounting plate (11), and a metal cylinder (8) is mounted at the adjacent end of the torque sensor (10) and the magnetic steel rotor (7), so that the magnetic steel rotor (7) can be sleeved in the metal cylinder (8); the servo motor (15) is fixed with the rack (18) through a servo motor mounting plate (14), a screw rod (13) is mounted on the servo motor (15), and the front end of the screw rod (13) is fixedly connected with the torsion sensor mounting plate (11) and can push the torsion sensor mounting plate (11) to slide.

2. The novel dynamometer machine as claimed in claim 1, wherein a motor pressing plate (21) is further arranged on the top of the motor mounting seat (20) for fixing the tested motor.

3. The novel dynamometer machine according to claim 1, wherein the sensor data line (12) of the torque sensor (10) and the data line of the rotation speed sensor (19) are electrically connected with an external data tester (22).

4. The dynamometer method based on the novel dynamometer is characterized in that a tested motor (1) drives a magnetic steel rotor (7) to rotate, and a rotating speed sensor (19) measures the rotating speed n of the tested motor; drive torsion sensor mounting panel (11) through servo motor 14 and slide, make metal cylinder (8) on it embolia magnet steel rotor (7) gradually, measure the torsion T on metal cylinder (8) that the electromagnetic eddy resistance that magnet steel rotor (7) produced when rotating with metal cylinder (8) formed by torsion sensor (10), at each test point, record the degree of depth L that magnet steel rotor (7) emboliaed metal cylinder (8) (the degree of depth L that the metal cylinder emboliaed magnet steel rotor is different, the hysteresis eddy resistance that produces is different, record the numerical value of torsion sensor (10) simultaneously, record the voltage value U at the surveyed electricity end, record the current value I at the surveyed electricity end, then according to the formula:

and P input = U × I, P output = T × n/9.55, and motor output power and motor efficiency data are calculated.