CN107367667B - Head-tail tester for winding of three-phase asynchronous motor - Google Patents

Abstract

The invention belongs to the field of test instruments and provides a head-tail tester for a winding of a three-phase asynchronous motor, which comprises a shell, wherein a test panel is arranged on the shell, a power supply is arranged in the shell, a universal meter, a U-phase test button QAU, a V-phase test button QAV, a V-phase test button QAW, a U-phase two-position double-knife double-gate switch KU, a V-phase two-position double-knife double-gate switch KV, a W-phase two-position double-knife double-gate switch KW, a U-phase red wiring terminal, a U-phase black wiring terminal, a V-phase red wiring terminal, a V-phase black wiring terminal, a W-phase red wiring terminal and a W-phase black wiring terminal are arranged on the test panel; the invention can improve the working efficiency of motor winding test and can be widely applied to the field of motor maintenance.

Description

Head-tail tester for winding of three-phase asynchronous motor

Technical Field

The invention belongs to the field of testing instruments, and particularly relates to a head-to-tail tester for a winding of a three-phase asynchronous motor.

Background

The head and tail ends (or called homonymous ends) of the three-phase asynchronous motor are particularly important, the three-phase asynchronous motor is damaged after maintenance and overhaul are finished or in the process of down-hole transportation and installation, a practical problem is often faced before use, when the motor winding connector is damaged, six wire ends of a stator winding cannot be blindly connected when the wire ends are not separated, so that internal faults of the motor are avoided, and therefore the head and tail ends of the six wire ends of the winding must be separated for connection. Before use or when the voltage of the newly started motor is changed, the head end and the tail end are also judged so as to prevent the error of factory time scale injection. The six wire ends of the motor stator are not known which two wire ends are a group, which three wire ends are one polarity, namely the same name end, and the winding phase sequence of the stator winding of the motor is not known. The blind power-on test is performed, the motor is not rotated after the power-on, the motor stator winding is more likely to be burnt, and great economic loss or trouble is brought to production and life, so that the head-to-tail tester for the three-phase asynchronous motor winding is needed to be provided, and the head-to-tail of the three-phase asynchronous motor is convenient to test rapidly.

Disclosure of Invention

The invention overcomes the defects existing in the prior art, and solves the technical problems that: the head-tail tester for the winding of the three-phase asynchronous motor is simple in structure and convenient and quick to test.

In order to solve the technical problems, the invention adopts the following technical scheme: the head-tail tester for the winding of the three-phase asynchronous motor comprises a shell, wherein a test panel is arranged on the shell, a power supply is arranged in the shell, and a universal meter, a U-phase test button QAU, a V-phase test button QAV, a W-phase test button QAW, a U-phase two-position double-knife double-gate switch KU, a V-phase two-position double-knife double-gate switch KV, a W-phase two-knife double-gate switch KW, a U-phase red wiring terminal, a U-phase black wiring terminal, a V-phase red wiring terminal, a V-phase black wiring terminal, a W-phase red wiring terminal and a W-phase black wiring terminal are arranged on the test panel; the U-phase red wiring terminal and the U-phase black wiring terminal are respectively connected with two knife wiring terminals of a U-phase two-position double-knife double-gate switch KU, the V-phase red wiring terminal and the V-phase black wiring terminal are respectively connected with two knife wiring terminals of a V-phase two-knife double-gate switch KW, and the W-phase red wiring terminal and the W-phase black wiring terminal are respectively connected with two knife wiring terminals of a W-phase two-knife double-gate switch KW; the two gate terminals of a first same-phase gate of the U-phase two-phase double-knife double-gate switch KU, the V-phase two-knife double-gate switch KW and the W-phase two-knife double-gate switch KW are respectively connected in parallel and then connected with a multimeter pen in parallel; one gate terminal of a second same phase gate of the U-phase two-knife two-gate switch KU, the V-phase two-knife two-gate switch KV and the W-phase two-knife two-gate switch KW is connected with the negative electrode of the power supply, and the other gate terminal is respectively connected with the U-phase test button QAU, the V-phase test button QAV and the W-phase test button QAW in series and then is connected with the positive electrode of the power supply.

The power supply comprises a voltage stabilizing module and a storage battery, wherein a power supply indicator lamp D, a charging switch K2 and an alternating current-direct current change-over switch K1 are further arranged on the test panel, the positive electrode of the storage battery is connected with the positive electrode of the voltage stabilizing module through the charging switch K2, the negative electrode of the storage battery is connected with the negative electrode of the voltage stabilizing module, and two ends of the power supply indicator lamp D are connected between the positive electrode and the negative electrode of the voltage stabilizing module; the first gate terminal of the alternating current-direct current change-over switch K1 is connected with the positive electrode of the storage battery, the second gate terminal is connected with the positive electrode of the voltage stabilizing module, and the knife terminal is connected with the other gate terminal of the second same phase gate of the U-phase two-knife two-gate switch KU, the V-phase two-knife two-gate switch KW and the W-phase two-knife two-gate switch KW through the U-phase test button QAU, the V-phase test button QAV and the W-phase test button QAW respectively.

The U-phase red wiring terminal, the U-phase black wiring terminal, the V-phase red wiring terminal, the V-phase black wiring terminal, the W-phase red wiring terminal and the W-phase black wiring terminal are respectively connected with a wire, tweezers are welded at the end points of each wire and are respectively connected with six wiring terminals of a motor winding, and marks of U1, U2, V1, V2, W1 and W2 are respectively arranged on the tweezers.

Compared with the prior art, the invention has the following beneficial effects: the invention relates to a three-phase asynchronous motor winding head-tail tester, which simplifies the line connection process in the test process by arranging a universal meter, a test button, a function selection switch and a wiring terminal on a test panel, improves the test work efficiency, saves the working hours, lightens the labor intensity of workers, takes a 55 kilowatt motor as an example, takes one shift time for two persons to disassemble the motor to find the head-tail, then installs the motor, and the like, and uses the tester to find the motor, so that one person can finish the test within 5 minutes, effectively reduces the failure rate of the motor, ensures the safe operation of equipment, eliminates various potential safety hazards and generates certain economic benefit.

Drawings

FIG. 1 is a schematic diagram of the arrangement of a test panel of a head-to-tail tester for windings of a three-phase asynchronous motor according to the present invention;

fig. 2 is a schematic circuit connection diagram of the head-to-tail tester of the winding of the three-phase asynchronous motor.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1, the embodiment of the invention provides a three-phase asynchronous motor winding head-tail tester, which comprises a shell, wherein a test panel is arranged on the shell, a power supply is arranged in the shell, a universal meter 1, a test button 2, a function selection switch 3 and a wiring terminal 4 are arranged on the test panel, wherein the test button 2 comprises a U-phase test button QAU, a V-phase test button QAV and a V-phase test button QAW, the function selection switch 3 comprises a U-phase two-knife two-gate switch KU, a V-phase two-knife two-gate switch KV and a W-phase two-knife two-gate switch KW, and the wiring terminal 4 comprises a U-phase red wiring terminal, a U-phase black wiring terminal, a V-phase red wiring terminal and a W-phase black wiring terminal. The universal meter 1 can be a 47-type pointer universal meter, and the power supply can be a 12V direct current stabilized voltage power supply.

As shown in fig. 2, the U-phase red connection terminal and the U-phase black connection terminal are respectively connected with two knife connection terminals of the U-phase two-position double-knife double-gate switch KU, the V-phase red connection terminal and the V-phase black connection terminal are respectively connected with two knife connection terminals of the V-phase two-knife double-gate switch KV, and the W-phase red connection terminal and the W-phase black connection terminal are respectively connected with two knife connection terminals of the W-phase two-knife double-gate switch KW; the two gate terminals of a first same-phase gate of the U-phase two-position double-knife double-gate switch KU, the V-phase two-position double-knife double-gate switch KV and the W-phase two-position double-knife double-gate switch KW are respectively connected in parallel and then connected with a multimeter pen in parallel; one gate terminal of a second same phase gate of the U-phase two-position double-knife double-gate switch KU, the V-phase two-knife double-gate switch KW and the W-phase two-knife double-gate switch KW is connected with the negative electrode of the power supply, and the other gate terminal is connected with the positive electrode of the power supply through a U-phase test button QAU, a V-phase test button QAV and a W-phase test button QAW respectively. The U-phase, V-phase and W-phase black wiring terminals are connected with the positive electrode of the power supply through a first in-phase gate, and the U-phase, V-phase and W-phase red wiring terminals are connected with the negative electrode of the power supply; through the second same phase floodgate, above-mentioned U looks, V looks, W looks black binding post are connected with the black terminal of universal meter, and U looks, V looks, W looks red binding post are connected with the red terminal of universal meter.

Further, the power supply comprises a voltage stabilizing module and a storage battery, the test panel is further provided with a power supply indicator lamp D, a charging switch K2 and an alternating current-direct current conversion switch K1, the voltage stabilizing module is externally connected with 220V alternating current and converts the alternating current into direct current voltage to be output, the positive electrode of the storage battery is connected with the positive electrode of the voltage stabilizing module through the charging switch K2, the negative electrode of the storage battery is connected with the negative electrode of the voltage stabilizing module, and two ends of the power supply indicator lamp D are connected between the positive electrode and the negative electrode of the voltage stabilizing module; the first gate terminal of the alternating current-direct current change-over switch K1 is connected with the positive electrode of the storage battery, the second gate terminal is connected with the positive electrode of the voltage stabilizing module, and the knife terminal is connected with the other gate terminal of the second same phase gate of the U-phase two-position double-knife double-gate switch KU, the V-phase two-knife double-gate switch KV and the W-phase two-knife double-gate switch KW through the U-phase test button QAU, the V-phase test button QAV and the V-phase test button QAW respectively. When the knife position of the alternating current-direct current change-over switch K1 is shifted to be connected with the U-phase gate terminal, the storage battery can be connected into the circuit, and when the knife position of the alternating current-direct current change-over switch K1 is shifted to be connected with the V-phase gate terminal, the voltage stabilizing module can be connected into the circuit; when the charging switch K2 is closed, the voltage stabilizing module can charge the storage battery. The two paths of power supplies increase the practicability of the head-to-tail tester, so that the head-to-tail tester can be used under the condition of alternating current power supply or under the condition of temporary no alternating current power supply.

Further, the U-phase red wiring terminal, the U-phase black wiring terminal, the V-phase red wiring terminal, the V-phase black wiring terminal, the W-phase red wiring terminal and the W-phase black wiring terminal are respectively connected with a wire, each wire end point is welded with a pair of tweezers, and the tweezers are used for being connected with two ends of a motor winding. The color of tweezers can be the same with binding post to annotate U1, V1, W1 on black tweezers respectively, annotate U2, V2, W2 on the red tweezers, set up tweezers and can simplify winding connection process when testing, annotate the discernment when can be convenient for the test.

The invention relates to a three-phase asynchronous motor winding head-tail tester, which comprises the following using process:

1. the test instrument pen in the universal meter is pulled out, the universal meter pen is inserted, the measuring range of the universal meter is adjusted to R multiplied by 10 omega gear, after the universal meter pen is in short circuit zero setting, two connector lugs of each phase in the three-phase winding, namely U phase, V phase and W phase, are respectively found by the universal meter, and marks are made.

2. Pulling out a multimeter pen, inserting a test instrument pen, adjusting the range of the multimeter to a 50mA gear of direct current milliamp, and connecting forceps U1 and U2 with a winding of a motor U; the tweezers V1 and V2 are connected with a motor V phase winding; the tweezers W1 and W2 are connected with the motor W phase winding, and the tweezers are used for connecting the binding posts quickly and conveniently; any one of a U-phase two-position double-knife double-gate switch KU, a V-phase two-position double-knife double-gate switch KV and a W-phase two-position double-knife double-gate switch KW, such as the W-phase two-knife double-gate switch KW, is shifted to the pen side (two knife terminals of the W-phase two-knife double-gate switch KW are connected with two gate terminals of a first same-phase gate thereof), the rest two-position double-knife double-gate switches are shifted to the power side (two knife terminals of the U-phase two-knife double-gate switch KU and the V-phase two-knife double-gate switch KV are connected with two gate terminals of a second same-phase gate thereof), and the power is turned on.

3. Judging the same name end of the winding, and adopting a first method: the electromagnetic induction principle can be utilized to judge: firstly, pressing a U-phase test button QAU once, observing the swinging direction of a pointer of a universal meter, and if the pointer swings forward, indicating that windings connected with a U-phase black wiring terminal and a W-phase black wiring terminal are head or tail, and needing no change; if the pointer swings reversely, the windings connected with the U-phase red wiring terminal and the W-phase black wiring terminal are the head or the tail, and at the moment, the two ends of the motor windings connected with the U-phase red tweezers and the U-phase black tweezers are replaced, so that the windings connected with the same-color wiring terminals of the U-phase and the W-phase are the head or the tail; then, pressing a V-phase test button QAV once again, observing the swinging direction of a pointer of the universal meter, judging the V phase in the same way, and if the pointer of the universal meter swings positively, indicating that windings connected with a V-phase black wiring terminal and a W-phase black wiring terminal are all head or tail heads, namely windings connected with same-color wiring terminals of a U-phase, a V-phase and a W-phase are all head or tail heads, and the change is not needed; if the pointer of the universal meter swings reversely, the windings connected with the V-phase red wiring terminal and the W-phase black wiring terminal are the same head or the tail head, and then the windings connected with the V-phase red tweezers and the V-phase black tweezers are exchanged, so that the same-color wiring terminals of the U-phase, the V-phase and the W-phase are the same head or the tail head. Therefore, the tester can find out the homonymous ends of the U, V, W three-phase winding through two tests.

The second method is as follows: the motor remanence method can also be used for judging the head and tail ends, the function selection switch U, V, W is all dialed to the pen side, the motor rotor is rotated by hand, if a pointer of a universal meter (microampere) is not moved, the assumed number is proved to be correct, if the pointer deflects, the assumption that the number of the head and tail ends of one phase is not corresponding is indicated, and the relative weight adjustment is carried out one by one until the pointer of the universal meter is not swung correctly.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (1)

1. The three-phase asynchronous motor winding head-tail tester is characterized by comprising a shell, wherein a test panel is arranged on the shell, a power supply is arranged in the shell, and a universal meter, a U-phase test button QAU, a V-phase test button QAV, a W-phase test button QAW, a U-phase two-position double-knife double-gate switch KU, a V-phase two-position double-knife double-gate switch KV, a W-phase two-position double-knife double-gate switch KW, a U-phase red wiring terminal, a U-phase black wiring terminal, a V-phase red wiring terminal, a V-phase black wiring terminal, a W-phase red wiring terminal and a W-phase black wiring terminal are arranged on the test panel;

the U-phase red wiring terminal and the U-phase black wiring terminal are respectively connected with two knife wiring terminals of a U-phase two-position double-knife double-gate switch KU, the V-phase red wiring terminal and the V-phase black wiring terminal are respectively connected with two knife wiring terminals of a V-phase two-knife double-gate switch KW, and the W-phase red wiring terminal and the W-phase black wiring terminal are respectively connected with two knife wiring terminals of a W-phase two-knife double-gate switch KW; the two gate terminals of a first same-phase gate of the U-phase two-position double-knife double-gate switch KU, the V-phase two-position double-knife double-gate switch KV and the W-phase two-position double-knife double-gate switch KW are respectively connected in parallel and then connected with a multimeter pen in parallel; one gate terminal of a second same phase gate of the U-phase two-phase double-knife double-gate switch KU, the V-phase two-knife double-gate switch KV and the W-phase two-knife double-gate switch KW is connected with the negative electrode of the power supply, and the other gate terminal is respectively connected with the U-phase test button QAU, the V-phase test button QAV and the W-phase test button QAW in series and then is connected with the positive electrode of the power supply;

the power supply comprises a voltage stabilizing module and a storage battery, wherein a power supply indicator lamp D, a charging switch K2 and an alternating current-direct current change-over switch K1 are further arranged on the test panel, the positive electrode of the storage battery is connected with the positive electrode of the voltage stabilizing module through the charging switch K2, the negative electrode of the storage battery is connected with the negative electrode of the voltage stabilizing module, and two ends of the power supply indicator lamp D are connected between the positive electrode and the negative electrode of the voltage stabilizing module; the first gate terminal of the alternating current-direct current change-over switch K1 is connected with the positive electrode of the storage battery, the second gate terminal is connected with the positive electrode of the voltage stabilizing module, and the knife terminal is connected with the other gate terminal of the second same-phase gate of the U-phase two-knife two-gate switch KU, the V-phase two-knife two-gate switch KV and the W-phase two-knife two-gate switch KW through the U-phase test button QAU, the V-phase test button QAV and the W-phase test button QAW respectively;

the U-phase red wiring terminal, the U-phase black wiring terminal, the V-phase red wiring terminal, the V-phase black wiring terminal, the W-phase red wiring terminal and the W-phase black wiring terminal are respectively connected with a wire, tweezers are welded at the end points of each wire and are respectively connected with six wiring terminals of a motor winding, and marks of U1, U2, V1, V2, W1 and W2 are respectively arranged on the tweezers.

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