Phase debugging device and method for motor turning

Abstract

The invention provides a phasing debugging device and method for a motor jigger, and relates to the technical field of motor debugging, and the device is characterized in that the positive electrode of a power module is connected with the U-phase wiring end of an AC motor, and the negative electrode of the power module is connected with the W-phase wiring end of the AC motor; the positive terminal of the indication module is connected with the V-phase wiring terminal of the AC motor, and the negative terminal of the indication module is connected with the negative electrode of the power supply module. A rotor of the alternating-current motor is manually and slowly rotated at a constant speed according to the steering identification direction of the motor load equipment; the wiring phase sequence of the alternating-current motor is correct if the indication condition of the indication device accords with the expected direction; otherwise, phase modulation is carried out on the alternating-current motor. The beneficial effects are that three-phase alternating current does not need to be provided; the motor does not need to be kept in a locked-rotor state; the device is simple in composition, low in requirement for professional level of an operator, convenient to carry and suitable for field debugging work of the alternating-current motor in an electrical engineering handover test.

Description

Technical Field

[0001] The invention relates to the technical field of motor debugging, and in particular to a phase-fixed debugging device and method for a motor cranking gear. Background Art

[0002] There is an invention in the prior art named: A very low frequency current detection device for detecting the phase sequence of a motor, application publication number: CN104215839A. The invention is characterized in that it provides extremely low frequency and low voltage three-phase alternating current to the stator winding of the motor. Apply extremely low frequency and low voltage three-phase alternating current to the three-phase winding of the AC motor to keep the motor in a stalled state, rotate the motor shaft in the direction required by the load, and observe the changes in the current value in the output circuit at the same time, so as to achieve the purpose of accurately and efficiently detecting the phase sequence of the motor. However, the invention still has some disadvantages: 1. It is necessary to provide extremely low frequency and low voltage three-phase alternating current to the three-phase winding of the motor. 2. The motor needs to be kept in a stalled state. 3. The device composition is complex, and observing the variables in the output circuit requires a certain level of professionalism from the operator. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a phase-fixing debugging device for a motor turning gear, comprising:

[0004] A power module, wherein the positive pole of the power module is connected to the U-phase terminal of the AC motor, and the negative pole of the power module is connected to the W-phase terminal of the AC motor;

[0005] An indication module, wherein the positive terminal of the indication module is connected to the V-phase terminal of the AC motor, and the negative terminal of the indication module is connected to the negative pole of the power module, and is used to indicate the correctness of the connection phase sequence of the AC motor when the rotor of the AC motor is manually rotated slowly and uniformly in the direction of the steering mark of the motor load device.

[0006] Preferably, a switch is connected between the positive pole of the power module and the U-phase terminal of the AC motor.

[0007] Preferably, the indicating module is a sensitive ammeter, and when the pointer of the sensitive ammeter deflects in the positive direction, it indicates that the wiring phase sequence of the AC motor is correct, and when the pointer of the sensitive ammeter deflects in the negative direction, it indicates that the wiring phase sequence of the AC motor is wrong.

[0008] Preferably, the power module is a plurality of dry cells connected in series.

[0009] The present invention also provides a phase-fixing debugging method for a motor cranking gear, which is applied to the phase-fixing debugging device as claimed in any one of claims 1 to 4, comprising:

[0010] Step S1, connecting the power module and the indication module of the phase-fixing debugging device to the UVW three-phase terminals of the AC motor;

[0011] Step S2, manually rotating the rotor of the AC motor slowly and uniformly in the direction of the steering mark of the motor load device;

[0012] Step S3, determining whether the indication direction of the indication device is correct:

[0013] If yes, the connection phase sequence of the AC motor is correct;

[0014] If not, the connection phase sequence of the AC motor is wrong, and the AC motor needs to be phase adjusted.

[0015] Preferably, the indicating module of the phase-fixing debugging device is a sensitive ammeter. Then in the step S3, when the pointer of the sensitive ammeter is deflected in the positive direction, it indicates that the wiring phase sequence of the AC motor is correct, and when the pointer of the sensitive ammeter is deflected in the negative direction, it indicates that the wiring phase sequence of the AC motor is wrong.

[0016] Preferably, a switch is connected between the positive pole of the power module and the U-phase terminal of the AC motor, and after executing step S2, the step further includes closing the switch.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] 1. No need to provide three-phase AC power;

[0019] 2. There is no need to keep the motor in a stalled state;

[0020] 3. The device is simple in composition, has low requirements on the professional level of the operator, is easy to carry, and is suitable for on-site commissioning of AC motors in electrical engineering handover tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic structural diagram of a phase-fixing debugging device for a motor turning gear in a preferred embodiment of the present invention;

[0022] Figure 2 The present invention is a flow chart of a method for phase adjustment of a motor cranking in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment, and other embodiments may also fall within the scope of the present invention as long as they conform to the gist of the present invention.

[0024] In a preferred embodiment of the present invention, based on the above problems existing in the prior art, a phase adjustment device 100 for a motor turning gear is provided. Figure 1 As shown, including:

[0025] A power module 1, wherein the positive pole of the power module 1 is connected to the U-phase terminal of the AC motor 200, and the negative pole of the power module 1 is connected to the W-phase terminal of the AC motor 200;

[0026] Indicator module 2, the positive terminal of indicator module 2 is connected to the V-phase terminal of AC motor 200, and the negative terminal of indicator module 2 is connected to the negative pole of power module 1, and is used to indicate the correctness of the wiring phase sequence of the AC motor when the rotor of the AC motor 200 is manually rotated slowly and uniformly in the direction of the steering mark of the motor load device.

[0027] Furthermore, in this embodiment, a switch S is connected between the positive electrode of the power module 1 and the U-phase terminal of the AC motor 200 .

[0028] Furthermore, in this embodiment, the indicating module 2 is a sensitive ammeter. When the pointer of the sensitive ammeter deflects in the positive direction, it indicates that the connection phase sequence of the AC motor is correct. When the pointer of the sensitive ammeter deflects in the negative direction, it indicates that the connection phase sequence of the AC motor is wrong.

[0029] Furthermore, in this embodiment, the power module 1 is a plurality of dry cells connected in series.

[0030] Specifically, the phase-fixing debugging device of the present invention has a simple structure, and only includes a plurality of dry batteries and a sensitive ammeter. It utilizes the residual magnetism of the AC motor to generate electricity and detects the motor stator induced electrical phase sequence of the AC motor to realize the motor phase-fixing debugging function. The device is easy to carry and easy to operate. After the device is installed, it is only necessary to observe the indicated direction of the sensitive ammeter to determine whether the wiring phase sequence of the AC motor is correct. The device is suitable for on-site debugging of AC motors in electrical engineering handover tests.

[0031] Furthermore, when it is difficult to adjust the phase of a high-power motor in a junction box, the phase can also be adjusted in an electrical panel cabinet, but the cable color code must be changed to make its phase color consistent with that of the cable at the panel cabinet end.

[0032] The present invention also provides a method for adjusting the phase of a motor cranking, using the above-mentioned phase adjustment device, such as Figure 2 As shown, including:

[0033] Step S1, connecting the power module and the indication module of the phase-fixing debugging device to the UVW three-phase terminals of the AC motor;

[0034] Step S2, manually rotating the rotor of the AC motor at a constant speed and slowly in the direction of the steering mark of the motor load device;

[0035] Step S3, judging whether the indication direction of the indication device is correct:

[0036] If yes, the wiring phase sequence of the AC motor is correct;

[0037] If not, the connection phase sequence of the AC motor is wrong, and the AC motor needs to be phase adjusted.

[0038] In this embodiment, the indication module of the phase adjustment device is a sensitive ammeter, and in step S3, it is determined whether the indication direction of the sensitive ammeter is a positive deflection:

[0039] If yes, the connection phase sequence of the AC motor is correct;

[0040] If not, the connection phase sequence of the AC motor is wrong, and the AC motor needs to be phase adjusted.

[0041] In this embodiment, a switch is connected between the positive pole of the power module and the U-phase terminal of the AC motor, and after executing step S2, the step further includes closing the switch.

[0042] Specifically, in this embodiment, the phase adjustment device in the above embodiment is used to adjust the phase of the AC motor, and firstly, the following steps are performed:

[0043] The phase-fixed debugging device in this embodiment encapsulates the indicator modules of the power module in a junction box. Only the wiring terminals at one end of the switch, the positive and negative wiring terminals of the indicator device and the negative wiring terminal of the power module need to be exposed on the top of the junction box. The wiring terminals at the other end of the switch and the positive wiring terminal of the power module are connected inside the junction box, and the negative wiring terminal of the indicator module and the negative wiring terminal of the power module are connected.

[0044] Subsequently, the three-phase winding lead wires U, V, and W of the AC motor are connected to the corresponding terminals of the phase-fixing device. The U-phase winding is connected to the terminal of the switch; the V-phase winding is connected to the positive terminal of the indication module (a sensitive ammeter in this embodiment); and the W-phase winding is connected to the negative terminal of the power module.

[0045] Then, manually rotate the rotor of the AC motor at a constant speed and slowly in the direction of the motor load device and close the switch. Observe the deflection of the pointer of the indicating device at the moment of closing the switch.

[0046] If the indicator deflects in the positive direction, the motor wiring phase sequence is correct; if the pointer deflects in the reverse direction, the motor wiring phase sequence is incorrect. If it is reverse, it can be adjusted to meet the requirements, usually in the motor junction box. For high-power motors, when it is difficult to adjust the phase in the junction box, it can also be adjusted in the electrical cabinet, but the cable color code must be changed to make its phase color consistent with the cable at the cabinet end.

[0047] In summary, the phase-fixing debugging device and debugging method provided by the present invention mainly solve the problem of AC motor steering phase-fixing. The power module increases the performance of the device and provides convenience for carrying. To facilitate the collection of test data, a display device is provided to display the test results, which is convenient for later data collection and judgment processing. The device saves the construction process of on-site motor cranking phase-fixing test, identifies phase sequence problems and performs phase adjustment in advance, avoiding adverse consequences caused by motor reversal.

[0048] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of this specification and illustrations should be included in the protection scope of the present invention.

Claims

1. A phase adjustment device for a motor cranking, characterized in that: include: A power module, wherein the positive pole of the power module is connected to the U-phase terminal of the AC motor, and the negative pole of the power module is connected to the W-phase terminal of the AC motor; An indication module, wherein the positive terminal of the indication module is connected to the V-phase terminal of the AC motor, and the negative terminal of the indication module is connected to the negative pole of the power module, and is used to indicate the correctness of the connection phase sequence of the AC motor when the rotor of the AC motor is manually rotated slowly and uniformly in the direction of the steering mark of the motor load device.

2. The phasing debugging device according to claim 1, characterized in that: A switch is connected between the positive pole of the power module and the U-phase terminal of the AC motor.

3. The phasing debugging device according to claim 1, characterized in that: The indicating module is a sensitive ammeter. When the pointer of the sensitive ammeter deflects in the positive direction, it indicates that the connection phase sequence of the AC motor is correct. When the pointer of the sensitive ammeter deflects in the negative direction, it indicates that the connection phase sequence of the AC motor is wrong.

4. The phasing debugging device according to claim 1, characterized in that: The power module is a plurality of dry cells connected in series.

5. A method for phase adjustment of a motor cranking, characterized in that: The phasing debugging device according to any one of claims 1 to 4 comprises: Step S1, connecting the power module and the indication module of the phase-fixing debugging device to the UVW three-phase terminals of the AC motor; Step S2, manually rotating the rotor of the AC motor at a constant speed and slowly in the direction of the steering mark of the motor load device; Step S3, determining whether the indication direction of the indication device is correct: If yes, the connection phase sequence of the AC motor is correct; If not, the connection phase sequence of the AC motor is wrong, and the AC motor needs to be phase adjusted.

6. The phasing debugging method according to claim 5, characterized in that: If the indication module of the phase-fixing debugging device is a sensitive ammeter, then in step S3, it is determined whether the indication direction of the sensitive ammeter is a positive deflection: If yes, the connection phase sequence of the AC motor is correct; If not, the connection phase sequence of the AC motor is wrong, and the AC motor needs to be phase adjusted.

7. The phasing debugging method according to claim 5, characterized in that: If a switch is connected between the positive pole of the power module and the U-phase terminal of the AC motor, then after executing step S2, the method further includes closing the switch.

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