Electric power closed loading test system

Abstract

The invention discloses an electric power closed loading test system, and relates to the field of transmission gearbox tests. The problem of torsional vibration caused by an alternating-current motor when the loading device of the gearbox realized by adopting the alternating-current motor is used for carrying out electric power closed loading is solved. The device is composed of a dragging motor, a main dragging coupling, a step-up gear box, a first torquemeter, a first coupling, a second torquemeter, a second coupling, a damper, a third coupling, an alternating current motor, a monitoring / control system and an electrical system cabinet, and the damper is additionally arranged between a test piece and the alternating current motor; and torque fluctuation of a test system cannot be caused. The problem of torsional vibration caused by an alternating current motor when the alternating current motor is used for carrying out electric power closed loading is solved. The gear box performance testing device is mainly used for testing the performance of the gear box.

Description

Technical Field

[0001] The invention relates to the field of transmission gear box testing. Background Art

[0002] With the development of my country's aviation technology, the aviation transmission gearboxes supporting the aviation industry have also developed accordingly, tending to be more high-power, high-load and miniaturized. New requirements have also been put forward for the loading test of aviation transmission gearboxes. The loading devices commonly used for gearboxes on the market currently include hydraulic loading and electric loading. Among them, the electric loading type mainly includes magnetic powder brakes, eddy current dynamometers, AC motors, etc. Magnetic powder brakes can only be used in low-speed conditions; eddy current dynamometers occupy a large space, require cooling water, and cannot feed electric energy back to the power grid, consuming a lot of energy; although AC motors have the advantages of being able to be used in high-speed and high-power conditions, occupying a small space, not requiring cooling water, and being able to feed electric energy back to the power grid, due to manufacturing processes, control and other reasons, when used as loads in electric power closed tests, they often cause torsional vibration of the mechanical system, destroying the operating balance of the test device, and even causing damage to the test device in severe cases. The above problems need to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to solve the torsional vibration problem caused by the AC motor when the gear box loading device using the AC motor performs electric power closed loading. The present invention provides an electric power closed loading test system.

[0004] Electric power closed loading test system, including drag motor, main drag coupling, speed increasing gearbox, first torque meter, first coupling, second torque meter, second coupling, damper, third coupling, AC motor, monitoring / control system and electrical system cabinet;

[0005] The AC motor is used as the loading motor of the test piece, and the test piece is the gearbox under test;

[0006] The monitoring / control system is used to control the speed of the traction motor and the output torque of the AC motor; it is also used to monitor the input and output speeds of the test piece, the bearing temperature inside the test piece, and the vibration of the test piece;

[0007] The electric energy output from the power grid supplies power to the traction motor through the electrical system cabinet;

[0008] The output shaft of the drag motor is connected to the input end of the speed-increasing gearbox through the main drag coupling, and the output shaft of the speed-increasing gearbox is connected to the input end of the test piece through the first torque meter and the first coupling in turn to drive the test piece;

[0009] The output end of the test piece is connected to the output shaft of the AC motor through the second torque meter, the second coupling, the damper and the third coupling in sequence to drive the AC motor to generate electricity, and the electric energy generated by the AC motor is sent to the power grid through the electrical system cabinet.

[0010] Preferably, the electric power closed loading test system further comprises a fourth coupling and a reduction gear box;

[0011] The fourth coupling is disposed between the test piece and the second torque meter;

[0012] The reduction gear box is arranged between the second torque meter and the second coupling.

[0013] Preferably, the ratio of the output speed to the input speed of the reduction gearbox is 1:5.

[0014] Preferably, the ratio of the output speed to the input speed of the speed increasing gearbox is 5:1.

[0015] Advantages of the present invention:

[0016] The present invention adds a damper between the test piece and the AC motor, and the torsional vibration excitation brought by the AC motor will not cause torque fluctuation of the test system after being isolated by the damper. The present invention overcomes the torsional vibration problem brought by the AC motor when the AC motor is used for electric power closed loading.

[0017] The use of the AC motor in the present invention can be widely used in the construction of various types of electric power closed test benches, and has the advantages of small footprint, low energy consumption, controllable and stable working state, etc.

[0018] The present invention also arranges a reduction gear box between the test piece and the AC motor to reduce the rotation speed of the AC motor, thereby avoiding the use of a high-speed AC motor and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the electric power closed loading test system of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0022] The purpose of the present invention is to overcome the problem that the AC motor brings additional torsional excitation and destroys the operating balance of the test device on the basis of retaining the advantages of the AC motor as a load. Therefore, the following implementation methods are provided:

[0023] Specific implementation method 1. Figure 1 The present embodiment is described. The electric power closed loading test system described in the present embodiment includes a traction motor 1, a main traction coupling 2, a speed increasing gearbox 3, a first torque meter 4, a first coupling 5, a second torque meter 8, a second coupling 10, a damper 11, a third coupling 12, an AC motor 13, a monitoring / control system 14 and an electrical system cabinet 15;

[0024] The AC motor 13 is used as the load of the test piece 6, and the test piece 6 is the gearbox under test;

[0025] The monitoring / control system 14 is used to control the speed of the traction motor 1 and the output torque of the AC motor 13; it is also used to monitor the input and output speeds of the test piece 6, the bearing temperature in the test piece 6, and the vibration of the test piece 6; the electric energy output by the power grid is supplied to the traction motor 1 through the electrical system cabinet 15;

[0026] The output shaft of the drag motor 1 is connected to the input end of the speed increasing gearbox 3 through the main drag coupling 2, and the output shaft of the speed increasing gearbox 3 is connected to the input end of the test piece 6 through the first torque meter 4 and the first coupling 5 in turn, so as to drive the test piece 6;

[0027] The output end of the test piece 6 is connected to the output shaft of the AC motor 13 through the second torque meter 8, the second coupling 10, the damper 11 and the third coupling 12 in sequence, driving the AC motor 13 to generate electricity, and the electric energy generated by the AC motor 13 is sent to the power grid through the electrical system cabinet 15.

[0028] In this embodiment, a damper 11 is added between the test piece 6 and the AC motor 13. The torsional vibration excitation brought by the AC motor 13 will not cause torque fluctuation of the test system after being isolated by the damper 11. The present invention overcomes the torsional vibration problem brought by the AC motor when the AC motor is used for electric power closed loading.

[0029] In specific applications, the electrical system cabinet 15 includes electrical systems such as a variable frequency speed regulation system, a rectifier system, and an inverter system, which can control the speed of the traction motor 1 and the output torque of the AC motor 13. The electric energy output by the power grid is supplied to the traction motor 1 through the electrical system cabinet 15, and the electric energy generated by the AC motor 13 is fed back to the power grid through the electrical system cabinet 15 to achieve power enclosure.

[0030] Furthermore, the ratio of the output speed to the input speed of the speed increasing gearbox 3 may be 5:1.

[0031] See also Figure 1 , further, the electric power closed loading test system further includes a fourth coupling 7 and a reduction gear box 9;

[0032] The fourth coupling 7 is arranged between the test piece 6 and the second torque meter 8;

[0033] The reduction gear box 9 is disposed between the second torque meter 8 and the second coupling 10 .

[0034] In this preferred embodiment, a reduction gear box 9 is further provided between the test piece 6 and the AC motor 13 to reduce the rotation speed of the AC motor 13, thereby avoiding the use of a high-speed AC motor and reducing costs.

[0035] In specific application, the ratio of the output speed to the input speed of the reduction gearbox 9 is 1:5.

[0036] Verification test:

[0037] An ABB AMI 450L2W BAFTS1500kW motor is used as the traction motor, an ABB M3FT250B4B 460kW AC motor is used as the loading motor, two HBM 1kNm torque meters are used to monitor the torque, a homemade gearbox (output speed / input speed=5 / 1) is used as the speed-increasing gearbox, and a homemade gearbox (output speed / input speed=1 / 5) is used as the speed-reducing gearbox. The damper is homemade, and the electrical system cabinet uses Siemens 6SL3320 series equipment.

[0038] The electric power closed loading test system was used to perform a performance test on a 400kW homemade gearbox. The test lasted 300 hours, and the 400kW homemade gearbox was able to well control the speed (±1rpm) and torque (±1.5Nm) from 0rpm to the rated speed (over 12000rpm). This proved that the present invention can effectively reduce torsional vibration.

[0039] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. Electric power closed loading test system, characterized in that: It comprises a traction motor (1), a main traction coupling (2), a speed increasing gearbox (3), a first torque meter (4), a first coupling (5), a second torque meter (8), a second coupling (10), a damper (11), a third coupling (12), an AC motor (13), a monitoring / control system (14) and an electrical system cabinet (15); The AC motor (13) is used as a loading motor of the test piece (6), and the test piece (6) is a gearbox to be tested; The monitoring / control system (14) is used to control the rotation speed of the traction motor (1) and the output torque of the AC motor (13); it is also used to monitor the input and output rotation speeds of the test piece (6), the bearing temperature in the test piece (6), and the vibration of the test piece (6); The electric energy outputted from the power grid is supplied to the traction motor (1) through the electrical system cabinet (15); The output shaft of the traction motor (1) is connected to the input end of the speed-increasing gearbox (3) through the main traction coupling (2), and the output shaft of the speed-increasing gearbox (3) is connected to the input end of the test piece (6) through the first torque meter (4) and the first coupling (5) in turn, so as to drive the test piece (6); The output end of the test piece (6) is connected to the output shaft of the AC motor (13) through the second torque meter (8), the second coupling (10), the damper (11) and the third coupling (12) in sequence, driving the AC motor (13) to generate electricity, and the electric energy generated by the AC motor (13) is sent to the power grid through the electrical system cabinet (15).

2. The electric power closed loading test system according to claim 1, characterized in that: It also includes a fourth coupling (7) and a reduction gear box (9); The fourth coupling (7) is arranged between the test piece (6) and the second torque meter (8); The reduction gear box (9) is arranged between the second torque meter (8) and the second coupling (10).

3. The electric power closed loading test system according to claim 2, characterized in that: The ratio of the output speed to the input speed of the reduction gear box (9) is 1:

5.

4. The electric power closed loading test system according to claim 1, characterized in that: The ratio of the output speed to the input speed of the speed increasing gearbox (3) is 5:1.

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