A towing test system

Abstract

The embodiment of the present invention provides a towing test system, which relates to the field of motor towing technology. The towing test system includes a first current detector, a first voltage detector, a test motor and a frequency converter, wherein the test motor is used to be coaxially arranged with the six-phase motor; the frequency converter includes a first inverter module, a second inverter module, a first rectifier module and a second rectifier module, wherein the first inverter module is used to be electrically connected to one of the three-phase windings of the six-phase motor, the second inverter module is electrically connected to the test motor, the first input end of the first inverter module is electrically connected to the first rectifier module, the second input end of the first inverter module is electrically connected to the second rectifier module, the third input end of the second inverter module is electrically connected to the second rectifier module, and the fourth input end of the second inverter module is electrically connected to the first rectifier module; while detecting the full load power of the six-phase motor, the large current temperature rise assessment of the first inverter module and the second inverter module is realized.

Description

Technical Field

[0001] The invention relates to the technical field of motor towing, and in particular to a towing test system. Background Art

[0002] For the existing six-phase motor to be subjected to the tow load test, a set of inverter is required to output six-phase power to the tested six-phase motor. At the same time, the accompanying three-phase motor requires a set of four-quadrant inverter to generate power to the grid side. When the tow test is working, the tested six-phase motor is in the electric state, and the accompanying three-phase motor is in the generating state.

[0003] The prior art requires two frequency converters to perform a full-load test on a six-phase motor. Summary of the invention

[0004] The purpose of the present invention is to provide a towing test system. The towing test system provided by the present invention is mainly used to detect the full load power of the six-phase motor. It can realize the large current temperature rise assessment of the first inverter module and the second inverter module while detecting the full load power of the six-phase motor.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] The embodiment of the present invention provides a towing test system for detecting the full load power of a six-phase motor. The towing test system comprises: a first current detector, a first voltage detector, a companion test motor and a frequency converter. The companion test motor is used to be coaxially arranged with the six-phase motor;

[0007] The frequency converter includes a first inverter module, a second inverter module, a first rectifier module and a second rectifier module, the first inverter module is used to be electrically connected to one of the three-phase windings of the six-phase motor, the second inverter module is electrically connected to the accompanying test motor, the first input end of the first inverter module is electrically connected to the first rectifier module, the second input end of the first inverter module is electrically connected to the second rectifier module, the third input end of the second inverter module is electrically connected to the second rectifier module, and the fourth input end of the second inverter module is electrically connected to the first rectifier module;

[0008] The first current detector is used to be connected in series with the six-phase motor to detect the current value of the six-phase motor; the first voltage detector is used to be connected in parallel with the six-phase motor to detect the voltage value of the six-phase motor, so as to detect the full load power through the voltage value of the six-phase motor and the current value of the six-phase motor.

[0009] In an optional embodiment of the present invention, the inverter also includes a first connecting bus and a second connecting bus, the first connecting bus is electrically connected to the first rectifier module, the second connecting bus is electrically connected to the second rectifier module, the first input terminal is electrically connected to the first connecting bus, the second input terminal is electrically connected to the second connecting bus, the third input terminal is electrically connected to the second connecting bus, and the fourth input terminal is electrically connected to the first connecting bus.

[0010] In an optional embodiment of the present invention, the frequency converter further includes a first filtering module, and the first filtering module is connected in parallel with the first inverter module.

[0011] In an optional embodiment of the present invention, the first filtering module includes a first capacitor and a second capacitor, and the first capacitor and the second capacitor are connected in series and then connected in parallel with the first inverter module.

[0012] In an optional embodiment of the present invention, the frequency converter further includes a second filtering module, and the second filtering module is connected in parallel with the second inverter module.

[0013] In an optional embodiment of the present invention, the second filtering module includes a third capacitor and a fourth capacitor, and the third capacitor and the fourth capacitor are connected in series and then connected in parallel with the second inverter module.

[0014] In an optional embodiment of the present invention, the first rectifier module is electrically connected to the second rectifier module.

[0015] In an optional embodiment of the present invention, the companion test motor is a three-phase motor.

[0016] In an optional embodiment of the present invention, the companion test motor is a six-phase motor, and the second inverter module is electrically connected to one of the three-phase windings of the companion test motor.

[0017] In an optional embodiment of the present invention, the towing test system also includes a second voltage detector and a second current detector. The second voltage detector is connected in parallel with the companion test motor to detect the voltage value of the companion test motor. The second current detector is connected in series with the companion test motor to detect the current value of the companion test motor, so as to detect the full load power through the voltage value of the companion test motor and the current value of the companion test motor.

[0018] Beneficial effects of the embodiments of the present invention: the towing test system includes a first current detector, a first voltage detector, a test motor and a frequency converter, the test motor is used to be coaxially arranged with the six-phase motor; the frequency converter includes a first inverter module, a second inverter module, a first rectifier module and a second rectifier module, the first inverter module is used to be electrically connected to one of the three-phase windings of the six-phase motor, the second inverter module is electrically connected to the test motor, the first input end of the first inverter module is electrically connected to the first rectifier module, the second input end of the first inverter module is electrically connected to the second rectifier module, the third input end of the second inverter module is electrically connected to the second rectifier module, and the fourth input end of the second inverter module is electrically connected to the first rectifier module; the first current detector is used to be connected in series with the six-phase motor to detect the current value of the six-phase motor; the first voltage detector is used to be connected in parallel with the six-phase motor to detect the voltage value of the six-phase motor, so as to detect the full load power through the voltage value and the current value of the six-phase motor.

[0019] In the embodiment of the present invention, the first input end of the first inverter module is electrically connected to the first rectifier module, the second input end is electrically connected to the second rectifier module, the third input end of the second inverter module is electrically connected to the second rectifier module, and the fourth input end is electrically connected to the first rectifier module. When one of the three-phase windings is detected, the first inverter module, the six-phase motor, the accompanying test motor and the second inverter module form a loop current, so that power is transferred between the first inverter module, the six-phase motor, the accompanying test motor and the second inverter module, and the large current temperature rise assessment of the first inverter module and the second inverter module is achieved while detecting the full load power of the six-phase motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A circuit diagram of a towing test system provided in an embodiment of the present invention.

[0022] Icon: 10-drag test system; 100-inverter; 110-first inverter module; 112-first input terminal; 114-second input terminal; 120-second inverter module; 122-third input terminal; 124-fourth input terminal; 130-first rectifier module; 140-second rectifier module; 150-first connecting bus; 160-second connecting bus; 170-first filter module; 172-first capacitor; 174-second capacitor; 180-second filter module; 182-third capacitor; 184-fourth capacitor; 200-accompanying test motor; 300-tested motor. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0028] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0029] Example

[0030] See also Figure 1The present embodiment provides a towing test system 10. The towing test system 10 provided in the present embodiment can detect the full load power of the six-phase motor while realizing the large current temperature rise assessment of the first inverter module 110 and the second inverter module 120.

[0031] The towing test system 10 provided in this embodiment is mainly used to detect the full load power of a six-phase motor, and the six-phase motor has two independent three-phase windings with a phase angle difference of 30°.

[0032] In this embodiment, the towing test system 10 includes: a first current detector, a first voltage detector, a test motor 200 and a frequency converter 100, wherein the test motor 200 is coaxially arranged with the six-phase motor;

[0033] The frequency converter 100 includes a first inverter module 110, a second inverter module 120, a first rectifier module 130 and a second rectifier module 140. The first inverter module 110 is used to be electrically connected to one of the three-phase windings of the six-phase motor, the second inverter module 120 is electrically connected to the accompanying test motor 200, the first input end 112 of the first inverter module 110 is electrically connected to the first rectifier module 130, the second input end 114 of the first inverter module 110 is electrically connected to the second rectifier module 140, the third input end 122 of the second inverter module 120 is electrically connected to the second rectifier module 140, and the fourth input end 124 of the second inverter module 120 is electrically connected to the first rectifier module 130;

[0034] The first current detector is used to be connected in series with the six-phase motor to detect the current value of the six-phase motor; the first voltage detector is used to be connected in parallel with the six-phase motor to detect the voltage value of the six-phase motor, so as to detect the full load power through the voltage value and current value of the six-phase motor.

[0035] In this embodiment, the six-phase motor is the tested motor 300 .

[0036] In this embodiment, the first input terminal 112 of the first inverter module 110 is electrically connected to the first rectifier module 130, the second input terminal 114 is electrically connected to the second rectifier module 140, the third input terminal 122 of the second inverter module 120 is electrically connected to the second rectifier module 140, and the fourth input terminal 124 is electrically connected to the first rectifier module 130. When one of the three-phase windings is detected, the first inverter module 110, the six-phase motor, the accompanying test motor 200 and the second inverter module 120 form a loop current, so that power is transmitted between the first inverter module 110, the six-phase motor, the accompanying test motor 200 and the second inverter module 120, and the large current temperature rise assessment of the first inverter module 110 and the second inverter module 120 is achieved while detecting the full load power of the six-phase motor.

[0037] In this embodiment, the first inverter module 110 is electrically connected to one of the three-phase windings of the six-phase motor, and one of the three-phase windings is detected first, and then the other three-phase winding is detected after the test. When both three-phase windings of the six-phase motor meet half of the full load power of the six-phase motor, it means that the six-phase motor is qualified.

[0038] In this embodiment, when testing one of the three-phase windings, it is pulled to half of the full load power of the six-phase motor. The rated power of the three-phase winding is calculated based on the detected current and voltage values. After completing the test of one three-phase winding, another set of three-phase windings is replaced and similarly pulled to half of the full load power of the six-phase motor. The rated power of the three-phase winding is calculated based on the detected current and voltage values. The full load power of the six-phase motor can be obtained by adding the rated powers of the two three-phase windings.

[0039] In this embodiment, the inverter 100 also includes a first connecting bus 150 and a second connecting bus 160, the first connecting bus 150 is electrically connected to the first rectifier module 130, the second connecting bus 160 is electrically connected to the second rectifier module 140, the first input terminal 112 is electrically connected to the first connecting bus 150, the second input terminal 114 is electrically connected to the second connecting bus 160, the third input terminal 122 is electrically connected to the second connecting bus 160, and the fourth input terminal 124 is electrically connected to the first connecting bus 150.

[0040] In this embodiment, the first rectifier module 130 is mainly used to rectify AC power into DC power, and the second rectifier module 140 is mainly used to rectify AC power into DC power. The first inverter module 110 is mainly used to invert DC power into AC power, and the second inverter module 120 is mainly used to invert DC power into AC power.

[0041] In this embodiment, the first inverter module 110 and the second inverter module 120 share the first connecting bus 150 and the second connecting bus 160. During the towing test of the six-phase motor and the accompanying test motor 200, power is transmitted between the first connecting bus 150, the six-phase motor, the accompanying test motor 200 and the second connecting bus 160, so as to realize the large current temperature rise test between the first connecting bus 150, the second connecting bus 160, the first inverter module 110 and the second inverter module 120.

[0042] In this embodiment, the frequency converter 100 further includes a first filter module 170 , and the first filter module 170 is connected in parallel with the first inversion module 110 .

[0043] In this embodiment, the first filtering module 170 is connected in parallel with the first inverter module 110 to perform filtering and noise reduction processing on the first inverter module 110 .

[0044] In this embodiment, the first filter module 170 includes a first capacitor 172 and a second capacitor 174 . The first capacitor 172 and the second capacitor 174 are connected in series and then connected in parallel with the first inverter module 110 .

[0045] In this embodiment, the first filtering module 170 includes two capacitors, a first capacitor 172 and a second capacitor 174, but is not limited to this. In other embodiments of the present invention, the number of capacitors may not only be two, but may be three, four or other numbers. Solutions that are equivalent to this embodiment and can achieve the effects of this embodiment are within the protection scope of the present invention.

[0046] In this embodiment, the frequency converter 100 further includes a second filter module 180 , and the second filter module 180 is connected in parallel with the second inversion module 120 .

[0047] In this embodiment, the second filtering module 180 is connected in parallel with the second inverter module 120 to perform filtering and noise reduction processing on the second inverter module.

[0048] In this embodiment, the second filter module 180 includes a third capacitor 182 and a fourth capacitor 184 . The third capacitor 182 and the fourth capacitor 184 are connected in series and then connected in parallel with the second inverter module 120 .

[0049] In this embodiment, the second filtering module 180 includes two capacitors, a third capacitor 182 and a fourth capacitor 184, but is not limited to this. In other embodiments of the present invention, the number of capacitors may not only be two, but may be three, four or other numbers. Solutions that are equivalent to this embodiment and can achieve the effects of this embodiment are within the protection scope of the present invention.

[0050] In this embodiment, the first rectifier module 130 is electrically connected to the second rectifier module 140 .

[0051] In this embodiment, the accompanying test motor 200 is a six-phase motor, and the second inverter module 120 is electrically connected to one of the three-phase windings of the accompanying test motor 200 .

[0052] In this embodiment, the towing test system 10 also includes a second voltage detector and a second current detector. The second voltage detector is connected in parallel with the accompanying test motor 200 to detect the voltage value of the accompanying test motor 200. The second current detector is connected in series with the accompanying test motor 200 to detect the current value of the accompanying test motor 200, so as to detect the full load power through the voltage value of the accompanying test motor 200 and the current value of the accompanying test motor 200.

[0053] In this embodiment, when the motor under test 300 drags the accompanying motor under test 200 to rotate, the accompanying motor under test 200 is in a power generation state. During the process of performing full-load power detection on the motor under test 300, the full-load power detection on the accompanying motor under test 200 can also be performed simultaneously.

[0054] In this embodiment, the tested motor 300 is the above-mentioned six-phase motor.

[0055] In this embodiment, when the test motor 200 is a six-phase motor, similarly, the second inverter module 120 is electrically connected to one of the three-phase windings of the six-phase motor, and one of the three-phase windings is detected first, and then the other three-phase winding is detected. When both three-phase windings of the six-phase motor meet half of the full load power of the six-phase motor, it indicates that the six-phase motor is qualified.

[0056] The specific detection process is the same as the detection process of the tested motor 300 , and reference may be made to the detection process of the tested motor 300 , which will not be described in detail here.

[0057] It should be noted that, in the present embodiment, the test motor 200 is a six-phase motor, but it is not limited thereto. In other embodiments of the present invention, the test motor 200 may also be a three-phase motor. When the test motor 200 is a three-phase motor, the second inverter module 120 is directly electrically connected to the three-phase winding of the three-phase motor. Any solution equivalent to the present embodiment that can achieve the effect of the present embodiment is within the protection scope of the present invention.

[0058] In summary, the towing test system 10 provided in this embodiment, in this embodiment, the first input end 112 of the first inverter module 110 is electrically connected to the first rectifier module 130, the second input end 114 is electrically connected to the second rectifier module 140, the third input end 122 of the second inverter module 120 is electrically connected to the second rectifier module 140, and the fourth input end 124 is electrically connected to the first rectifier module 130. When one of the three-phase windings is detected, the first inverter module 110, the six-phase motor, the accompanying test motor 200 and the second inverter module 120 form a loop current, so that power is transmitted between the first inverter module 110, the six-phase motor, the accompanying test motor 200 and the second inverter module 120, and a large current temperature rise assessment of the first inverter module 110 and the second inverter module 120 is achieved while detecting the full load power of the six-phase motor.

[0059] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A towing test system for detecting the full load power of a six-phase motor, characterized in that: include: A first current detector, a first voltage detector, a test motor and a frequency converter, wherein the test motor is coaxially arranged with the six-phase motor, and the six-phase motor has two independent three-phase windings; The frequency converter includes a first inverter module, a second inverter module, a first rectifier module and a second rectifier module, the first inverter module is used to be electrically connected to one of the three-phase windings of the six-phase motor, the second inverter module is electrically connected to the accompanying test motor, the first input end of the first inverter module is electrically connected to the first rectifier module, the second input end of the first inverter module is electrically connected to the second rectifier module, the third input end of the second inverter module is electrically connected to the second rectifier module, and the fourth input end of the second inverter module is electrically connected to the first rectifier module; The first current detector is used to be connected in series with the six-phase motor to detect the current value of the six-phase motor; the first voltage detector is used to be connected in parallel with the six-phase motor to detect the voltage value of the six-phase motor, so as to detect the full load power through the voltage value of the six-phase motor and the current value of the six-phase motor; Test one of the three-phase windings, and then test the other three-phase winding after the test is completed; When conducting a test on one of the three-phase windings, it is dragged to half of the full load power of the six-phase motor; the rated power of the three-phase winding is calculated based on the detected current and voltage values; after completing the test of one three-phase winding, replace another set of three-phase windings, and similarly drag it to half of the full load power of the six-phase motor, and calculate the rated power of the three-phase winding based on the detected current and voltage values. The full load power of the six-phase motor can be obtained by adding the rated powers of the two three-phase windings.

2. The towing test system according to claim 1, characterized in that: The inverter also includes a first connecting bus and a second connecting bus, the first connecting bus is electrically connected to the first rectifier module, the second connecting bus is electrically connected to the second rectifier module, the first input end is electrically connected to the first connecting bus, the second input end is electrically connected to the second connecting bus, the third input end is electrically connected to the second connecting bus, and the fourth input end is electrically connected to the first connecting bus.

3. The towing test system according to claim 1, characterized in that: The frequency converter further includes a first filtering module, and the first filtering module is connected in parallel with the first inversion module.

4. The towing test system according to claim 3, characterized in that: The first filtering module includes a first capacitor and a second capacitor. The first capacitor and the second capacitor are connected in series and then connected in parallel with the first inverter module.

5. The towing test system according to claim 1, characterized in that: The frequency converter further includes a second filtering module, and the second filtering module is connected in parallel with the second inversion module.

6. The towing test system according to claim 5, characterized in that: The second filtering module includes a third capacitor and a fourth capacitor. The third capacitor and the fourth capacitor are connected in series and then connected in parallel with the second inverter module.

7. The towing test system according to claim 1, characterized in that: The first rectifier module is electrically connected to the second rectifier module.

8. The towing test system according to claim 1, characterized in that: The accompanying test motor is a three-phase motor.

9. The towing test system according to claim 1, characterized in that: The accompanying test motor is a six-phase motor, and the second inverter module is electrically connected to one of the three-phase windings of the accompanying test motor.

10. The towing test system according to claim 1, characterized in that: The towing test system also includes a second voltage detector and a second current detector. The second voltage detector is connected in parallel with the accompanying test motor to detect the voltage value of the accompanying test motor. The second current detector is connected in series with the accompanying test motor to detect the current value of the accompanying test motor, so as to detect the full load power through the voltage value of the accompanying test motor and the current value of the accompanying test motor.

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