CN105630020A - Electromagnetic friction active loading system - Google Patents

Abstract

An electromagnetic friction active loading system relates to a load simulation device. The load simulator aims to solve the problem that the loading moment of an existing load simulator is easily interfered by the movement of a tested object. The torque sensor sends the detected torque of the tested device to the controller, the controller sends a current control signal to the constant current source, and two current signal output ends of the constant current source are respectively connected with coils of the first electromagnetic clutch and the second electromagnetic clutch; the rotating shaft of the tested equipment is connected with the shaft through a third coupler and a fourth coupler; the first motor and the second motor are respectively used for driving parts of the first electromagnetic clutch and the second electromagnetic clutch to rotate, the rotating directions of the two driving parts are opposite, and the rotating speeds are the same; and the driven member of the first electromagnetic clutch and the driven member of the second electromagnetic clutch are connected with the shaft key. The invention has the advantages of no interference of a tested object, high loading precision, high system frequency band, simple and reliable control algorithm and the like, and is suitable for testing the performance of the motor.

Description

Electromagnetic Friction Active Loading System

technical field

The invention relates to a load simulation device capable of simulating various load signals, which belongs to the field of servo control and semi-physical simulation.

Background technique

At present, in various high-tech fields such as aerospace and weaponry, it is usually necessary to perform dynamic tests on the drive unit or other key components of the product to test its performance to ensure the reliability of the designed product, and to optimize the product to meet Product requirements for performance. To ensure the reliability of the test data, it is necessary to test the tested equipment under the real load environment. However, product testing in a real environment requires a lot of manpower and material resources, and some are even unrealizable, such as seismic fluctuation loads. Therefore, it is necessary to simulate the required load in the laboratory environment, realize the ground half-physical simulation, and conduct dynamic tests on the tested object. This technology has the advantages of good controllability, non-destructive, all-weather, simple and convenient operation, repeatable experiment, etc. Its economy is unmatched by classic self-destructive experiments. In order to reproduce the dynamic load of the measured object in the actual work process under laboratory conditions, simulate the dynamic load environment of the measured object in the actual work, and transform the classic self-destructive experiment into an experimental For prediction research under room conditions, the traditional load simulator came into being. However, there are always many technical problems in the traditional load simulator: the traditional load simulator is disturbed by the movement of the object under test, which seriously affects the loading performance of the system, and it is difficult to guarantee the small moment loading performance and high-precision dynamic loading; the real load changes in various and drastic changes , the bandwidth of the traditional load simulator is difficult to meet the requirements; in order to improve the performance of the traditional load simulator, its control strategy is complex and the control strategy is poor in versatility.

The performance of the load simulator is directly related to the accuracy of the test and simulation of the loaded equipment, and a high-performance loading system can guarantee product performance. In order to completely eliminate the drawbacks of load simulators, new equipment and technologies are urgently needed to improve dynamic loading performance and loading bandwidth, and to achieve accurate load simulation.

Contents of the invention

The purpose of the present invention is to provide an electromagnetic friction active loading system to solve the problem that the existing load simulator is easily disturbed by the motion of the object under test, seriously affects the loading performance of the system, and is difficult to achieve high-precision and high-bandwidth loading.

The electromagnetic friction active loading system of the present invention includes a No. 1 motor 15, a controller 001, a D/A module 002, an amplifier 003, a constant current source 004, a stabilized voltage source 005, an A/D module 006, and No. 2 motor 41 , No. 1 electromagnetic clutch 14, No. 2 electromagnetic clutch 16, torque sensor 3 and shaft 34;

The torque sensor 3 is used to detect the torque of the device under test 1. The detection signal output terminal of the torque sensor 3 is connected to the feedback signal input terminal of the controller 001 through the A/D module 006, and the current control signal output terminal of the controller 001 is sequentially passed through the D/D module 006. The A module 002 and the amplifier 003 are connected to the current control signal input terminal of the constant current source 004, and the two current signal output terminals of the constant current source 004 are respectively connected to the coils of the No. 1 electromagnetic clutch 14 and the No. 2 electromagnetic clutch 16;

The rotating shaft of the device under test 1 is connected to the shaft 34 through the third coupling 2 and the fourth coupling 4;

No. 1 motor 15 and No. 2 motor 41 are respectively used to drive the driving parts of No. 1 electromagnetic clutch 14 and No. 2 electromagnetic clutch 16 to rotate, and the rotation directions of the two driving parts are opposite, and the rotating speed is the same;

The driven part of No. 1 electromagnetic clutch 14 and the driven part of No. 2 electromagnetic clutch 16 are all connected with shaft 34 key.

The beneficial effects of the present invention are: the driving element or system can be tested by simulating a variety of loads through the electromagnetic friction active loading method, which changes the rigid connection between the equipment under test and the loader in the past. This electromagnetic friction loading system converts the original passive Loading is converted into active loading, the motion of the object under test has almost no effect on the loading system, and the electromagnetic response is fast, so the electromagnetic friction active loading system of the present invention can realize dynamic loading with high precision and high frequency response.

Description of drawings

Fig. 1 is the functional block diagram of the electromagnetic friction active loading system of the present invention;

Fig. 2 is a structural schematic diagram of No. 1 electromagnetic clutch;

Figure 3 is the load curve, the abscissa indicates the time, and the ordinate indicates the magnitude of the current, above the X-axis means to energize the No. 1 magnetic powder clutch, and below the X-axis means to energize the No. 2 magnetic powder clutch;

Fig. 4 is a structural schematic diagram of the mechanical part of the electromagnetic friction active loading system according to the present invention, in which 25 represents a separation spring, and 36 represents an armature.

detailed description

Specific Embodiment 1: This embodiment is described in conjunction with Fig. 1 to Fig. 3. The electromagnetic friction active loading system described in this embodiment includes a controller 001, a D/A module 002, an amplifier 003, a constant current source 004, and a voltage stabilizer 005, A/D module 006, No. 1 motor 15, No. 2 motor 41, No. 1 electromagnetic clutch 14, No. 2 electromagnetic clutch 16, torque sensor 3 and shaft 34;

The torque sensor 3 is used to detect the torque of the device under test 1. The detection signal output terminal of the torque sensor 3 is connected to the feedback signal input terminal of the controller 001 through the A/D module 006, and the current control signal output terminal of the controller 001 is sequentially passed through the D/D module 006. The A module 002 and the amplifier 003 are connected to the current control signal input terminal of the constant current source 004, and the two current signal output terminals of the constant current source 004 are respectively connected to the coils of the No. 1 electromagnetic clutch 14 and the No. 2 electromagnetic clutch 16;

The rotating shaft of the device under test 1 is connected to the shaft 34 through the third coupling 2 and the fourth coupling 4;

No. 1 motor 15 and No. 2 motor 41 are respectively used to drive the driving parts of No. 1 electromagnetic clutch 14 and No. 2 electromagnetic clutch 16 to rotate, and the rotation directions of the two driving parts are opposite, and the rotating speed is the same;

The driven part of No. 1 electromagnetic clutch 14 and the driven part of No. 2 electromagnetic clutch 16 are all connected with shaft 34 key.

As shown in FIGS. 3 and 4 , the No. 1 electromagnetic clutch 14 has the same structure as the No. 2 electromagnetic clutch 16 . In the No. 1 electromagnetic clutch 14, the outer friction plate 51 and the driving member 54 are connected by splines, and the outer friction plate 51 can rotate together with the driving member 54 and move along the axial direction. The axial direction refers to the length direction of the shaft 34, and the inner friction plate 51 The friction plate 50 is connected with the follower 55 through a spline.

As shown in Figure 4, the rotating shaft of the device under test 1 is connected to the shaft 34 through the third coupling 2 and the fourth coupling 4, and the torque sensor 3 is arranged between the third coupling 2 and the fourth coupling 4 between. The No. 1 motor 15 drives the outer friction plate 51 to rotate through the active part 54 of the No. 1 electromagnetic clutch 14, and the outer friction plate 51 and the inner friction plate 50 rotate relatively. When the coil 48 of the No. 1 electromagnetic clutch 14 is energized, the armature 52 moves along the The outer friction plate 51 and the inner friction plate 50 are compressed by the axial movement, and a friction torque is generated between the outer friction plate 51 and the inner friction plate 50 , and the torque is transmitted to the follower 55 . The No. 2 motor 41 drives the outer friction plate 23 to rotate through the active part 27 of the No. 2 electromagnetic clutch 16, and the outer friction plate 23 and the inner friction plate 24 rotate relatively. When the coil 20 of the No. 2 electromagnetic clutch 16 is energized, the armature 26 moves along the The outer friction plate 23 and the inner friction plate 24 are compressed by the axial movement, and a friction torque will be generated between the outer friction plate 23 and the inner friction plate 24, and this torque is transmitted to the follower 29. No. one motor 15 and No. two motors 41 reversely rotate at the same speed, so that the outer friction plates 51 of the first electromagnetic clutch 14 and the outer friction plates 23 of the second electromagnetic clutch 16 will rotate at the same speed in the opposite direction, so that they are respectively connected to a When the inner friction disc 50 of the No. 1 electromagnetic clutch 14 and the inner friction disc 24 of the No. 2 electromagnetic clutch 16 rub against each other, the friction torque in the opposite direction is output. The torque signal detected by the torque sensor 3 is processed by the A/D module 006 and then transmitted to the controller 001. The controller 001 compares the received signal with the given signal to obtain a control signal, and the controller 001 passes the control signal through D/D A module 002 transmits the signal to the amplifier 003 to amplify the signal, and controls the constant current source 004 to output the required current according to the amplified signal. The voltage stabilization source 005 can stabilize the current of the constant current source 004, and the current is transmitted to the first electromagnetic clutch 14 or the second The electromagnetic clutch 16 makes the No. 1 electromagnetic clutch 14 or No. 2 electromagnetic clutch 16 output torque, and the torque is loaded on the device under test 1 to realize closed-loop control, which can precisely control the magnitude of the torque and continuously change the torque according to the demand. Whether the current output by the constant current source 004 is transmitted to the No. 1 electromagnetic clutch 14 or the No. 2 electromagnetic clutch 16 is determined by the preset load curve.

The traditional load simulator rigidly connects the motor under test and the motor acting as the load (equivalent to the torque motor in the present invention), the rotation of one motor will definitely affect the other motor, and the smaller the signal applied to the motor acting as the load , the more intense the movement of the motor under test, the less accurate the realization of the signal. However, the present invention connects two motors through an electromagnetic clutch. The principle of the clutch is that there can be relative movement between the active part and the driven part, and torque can be transmitted through internal and external friction plates. The clutch active part keeps rotating in one direction. , then the torque transmitted by the driven part is in one direction, and the driving parts of the two clutches rotate in opposite directions, so the torque in two directions can be transmitted, and the load curve is set for the controller. An electromagnetic clutch is energized, which can well ensure the small torque and high-precision loading performance of the electromagnetic friction active loading system. When the electromagnetic clutch is energized, the electromagnetic response is fast. In addition, the inertia of the follower connected to the tested motor shaft is relatively small, so dynamic loading with high bandwidth can be realized.

Specific embodiment 2: This embodiment is described in conjunction with FIG. 4 . This embodiment is a further limitation of the electromagnetic friction active loading system described in Embodiment 1. In this embodiment, the No. 1 motor 15 is driven by the No. 1 shaft coupling 13 No. 1 gear 11, No. 1 gear 11 meshes with No. 2 gear 12, No. 2 gear 12 is fixedly connected with driving part 54 of No. 1 electromagnetic clutch 14, No. 2 motor 41 drives No. 3 gear 39 through No. 2 shaft coupling 40, The third gear 39 meshes with the fourth gear 28, the fourth gear 28 is fixedly connected with the active part 27 of the second electromagnetic clutch 16, and the second gear 12 and the fourth gear 28 are all keyed to the shaft 34.

Specific Embodiment Three: This embodiment is described in conjunction with FIG. 4. This embodiment is a further limitation of the electromagnetic friction active loading system described in Embodiment One. In this embodiment, the coil 48 of the No. 1 electromagnetic clutch 14 is fixed on the yoke In 43 , the yoke 43 of the first electromagnetic clutch 14 and the yoke 21 of the second electromagnetic clutch 16 are both fixedly connected to the bracket 42 .

In this way, the moment of inertia of the driving part and the driven part of the electromagnetic clutch is very small, which is convenient for control.

Specific Embodiment 4: This embodiment is described in conjunction with FIG. 4. This embodiment is a further limitation of the electromagnetic friction active loading system described in Embodiment 3. In this embodiment, No. 1 electromagnetic clutch 14 also includes a separation spring 57, each One end of each outer friction plate 51 and one end of each inner friction plate 50 are all inserted in the separation spring 57.

As shown in FIG. 4 , when the separation spring 57 is in a natural state, it can completely separate the outer friction plate 51 from the inner friction plate 50 to keep the idling moment as small as possible when no load is applied.

Embodiment 5: This embodiment is described with reference to FIG. 4 . This embodiment is a further limitation of the electromagnetic friction active loading system described in Embodiment 1. In this embodiment, the No. 1 motor 15 and the No. 2 motor 41 have the same structure.

Two identical motors, with the same gear transmission system, make the output torque characteristics of forward and reverse loading exactly the same.

Embodiment 6: This embodiment is described in conjunction with FIG. 4 . This embodiment is a further limitation of the electromagnetic friction active loading system described in Embodiment 1. In this embodiment, the number of inner friction plates 50 and the number of outer friction plates 51 quantity, and the gap between the inner friction plate 50 and the outer friction plate 51 is adjustable.

By adjusting the number and clearance of internal and external friction plates, the maximum output torque can be adjusted.

Claims (6)

1. electromagnet-friction actively loading system, including a motor (15), it is characterized in that, it also includes controller (001), D/A module (002), amplifier (003), constant-current source (004), source of stable pressure (005), A/D module (006), No. two motors (41), electromagnetic clutch (14), No. two electromagnetic clutchs (16), torque sensor (3) and axle (34);

Torque sensor (3) is devices under the moment of (1) for detection, the detection signal output part of torque sensor (3) connects the feedback signal input terminal of controller (001) by A/D module (006), the current controling signal outfan of controller (001) passes sequentially through D/A module (002) and the current controling signal input of amplifier (003) connection constant-current source (004), two current signal output ends of constant-current source (004) connect the coil of an electromagnetic clutch (14) and No. two electromagnetic clutchs (16) respectively,

The rotating shaft being devices under (1) is connected with axle (34) by No. three shaft couplings (2) and No. four shaft couplings (4);

A number motor (15) and No. two motors (41) are respectively used for driving the driving link of an electromagnetic clutch (14) and No. two electromagnetic clutchs (16) and rotate, and the direction of rotation of two driving links is contrary, rotating speed is identical;

The driven member of a number electromagnetic clutch (14) and the driven member of No. two electromagnetic clutchs (16) are all connected with axle (34) key.

2. electromagnet-friction according to claim 1 actively loading system, it is characterized in that, a number motor (15) drives a gear (11) by a shaft coupling (13), a number gear (11) is engaged with No. two gears (12), No. two gears (12) are fixed with the driving link (54) of an electromagnetic clutch (14) and are connected, No. two motors (41) drive No. three gears (39) by No. two shaft couplings (40), No. three gears (39) are engaged with No. four gears (28), No. four gears (28) are fixed with the driving link (27) of No. two electromagnetic clutchs (16) and are connected, No. two gears (12) are all connected with axle (34) key with No. four gears (28).

3. electromagnet-friction according to claim 1 actively loading system, it is characterized in that, the coil (48) of a number electromagnetic clutch (14) is fixed in yoke (43), and the yoke (43) of an electromagnetic clutch (14) and the yoke (21) of No. two electromagnetic clutchs (16) are all fixing with support (42) to be connected.

4. electromagnet-friction according to claim 3 actively loading system, it is characterized in that, a number electromagnetic clutch (14) also includes cut spring (57), and one end of each outside friction disc (51) and one end of each inner attrition piece (50) are all inserted in cut spring (57).

5. electromagnet-friction according to claim 1 actively loading system a, it is characterised in that motor (15) is identical with No. two motor (41) structures.

6. electromagnet-friction according to claim 1 actively loading system, it is characterized in that, the quantity of inner attrition piece (50), outside friction disc (51) quantity, and the gap of inner attrition piece (50) and outside friction disc (51) is all adjustable.