Wiring detection device of three-phase motor winding

Abstract

A wiring detection device of a three-phase motor winding is used for detecting whether connection between the head end and the tail end of the winding and a binding post is correct or not and comprises a first voltmeter M1, a second voltmeter M2 and a transformer BK1. The device is characterized in that one end of a first voltmeter M1 is connected with one end of the secondary of a transformer BK1, and one end of a second voltmeter M2 is connected with the other end of the secondary of the transformer BK1; the other end of the first voltmeter is connected with the second binding post U2, one end of the first voltmeter is connected with the third binding post V1, and one end of the first voltmeter is connected with the sixth binding post W2; one end of the second voltmeter is connected with the fifth binding post W1, the other end of the second voltmeter is connected with the first binding post U1, and the other end of the second voltmeter is connected with the fourth binding post V2; and the primary of the transformer BK1 is connected with the mains supply. The beneficial effects of the utility model are that by observing the indicating values of the first voltmeter and the second voltmeter, which phase winding is wrongly connected can be rapidly detected, the use is convenient, and the detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a winding detection device for a three-phase motor winding. Background Art

[0002] The six wire ends of the three-phase motor winding are connected to the terminal block (such as Figure 2 Each terminal is marked on the terminal block (as shown in FIG5 ), and the motor winding can be conveniently set to a star or triangle shape according to the mark; the connection between the winding and the terminal block follows a certain pattern, that is, the starting end and the tail end of the A-phase winding are connected to the first terminal U1 and the second terminal U2 respectively, the starting end and the tail end of the B-phase winding are connected to the third terminal V1 and the fourth terminal V2 respectively, and the starting end and the tail end of the C-phase winding are connected to the fifth terminal WI and the sixth terminal W2 respectively.

[0003] During motor assembly or maintenance, if the head and tail ends of a phase winding are connected incorrectly, the current in the winding will flow in opposite directions, causing magnetomotive force imbalance, vibration and noise in the motor, slow or even no rotation, and severe three-phase current imbalance. This requires checking the head and tail ends of each winding phase one by one. The usual method is to first swap the wire ends of one phase winding, connect the three-phase power supply, and observe the motor operation. If the operation is abnormal, restore the wiring of the phase winding, then swap the wire ends of the other phase winding, connect the three-phase power supply, and observe the motor operation until the motor operates normally. This error correction method is inefficient. Utility Model Content

[0004] In view of the above problems, the present invention proposes a wiring detection device for three-phase motor windings, which can easily determine which phase winding has the wrong wiring at the beginning and end, thereby improving error correction efficiency.

[0005] The technical solution of the utility model is a three-phase motor winding connection detection device, which includes a first voltmeter M1, a second voltmeter M2, and a transformer BK1; the characteristic is that one end of the first voltmeter M1 is connected to one end of the secondary of the transformer BK1, and one end of the second voltmeter M2 is connected to the other end of the secondary of the transformer BK1;

[0006] The other end of the first voltmeter has a second lead wire 2 connected to the second terminal U2, one end of the first voltmeter has a third lead wire 3 connected to the third terminal V1, and one end of the first voltmeter has a sixth lead wire 6 connected to the sixth terminal W2;

[0007] One end of the second voltmeter has a fifth lead wire 5 connected to the fifth terminal W1, the other end of the second voltmeter has a first lead wire 1 connected to the first terminal U1, and the other end of the second voltmeter has a fourth lead wire 4 connected to the fourth terminal V4;

[0008] The primary of transformer BK1 is connected to the mains.

[0009] During use, the first lead wire 1, the second lead wire 2, the third lead wire 3, the fourth lead wire 4, the fifth lead wire 5, and the sixth lead wire 6 are connected to the first terminal U1, the second terminal U2, the third terminal V1, the fourth terminal V2, the fifth terminal WI, and the sixth terminal W2, respectively. The transformer is powered on. By observing the readings of the first voltmeter and the second voltmeter, it can be determined which phase winding is incorrectly wired. The relationship between the readings of the first and second voltmeters and whether the wiring of each winding is incorrect can be expressed in the following table:

[0010] A B C M1 M2 √ √ √ 2u 2u × √ √ 0 2u √ × √ 0 0 √ √ × 2u 0

[0011] In the table, × indicates incorrect wiring, √ indicates correct wiring, 2u and 0 are the indications of the first voltmeter M1 and the second voltmeter M2, and u is the voltage value of the secondary voltage of the transformer BK1.

[0012] The beneficial effects of the utility model are that it can quickly detect which phase winding is connected incorrectly, is easy to use, and improves detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a circuit diagram of the utility model.

[0014] Figure 2 A schematic diagram of the wiring board. DETAILED DESCRIPTION

[0015] A three-phase motor winding connection detection device includes a first voltmeter M1, a second voltmeter M2, and a transformer BK1; wherein one end of the first voltmeter M1 is connected to one end of the secondary of the transformer BK1, and one end of the second voltmeter M2 is connected to the other end of the secondary of the transformer BK1;

[0016] The other end of the first voltmeter has a second lead wire 2 connected to the second terminal U2, one end of the first voltmeter has a third lead wire 3 connected to the third terminal V1, and one end of the first voltmeter has a sixth lead wire 6 connected to the sixth terminal W2;

[0017] One end of the second voltmeter has a fifth lead wire 5 connected to the fifth terminal W1, the other end of the second voltmeter has a first lead wire 1 connected to the first terminal U1, and the other end of the second voltmeter has a fourth lead wire 4 connected to the fourth terminal V2;

[0018] One end of the primary of the transformer BK1 is connected to the a-phase line of the mains through the switch K1, and the other end of the primary of the transformer BK1 is connected to the 0 line of the mains.

[0019] To ensure the safety of the operator, the voltage value u of the secondary voltage of transformer BK1 is 12 volts.

[0020] The first lead wire 1, the second lead wire 2, the third lead wire 3, the fourth lead wire 4, the fifth lead wire 5 and the sixth lead wire 6 are all provided with wire clamps at their ends, which are used to clamp the terminal to facilitate the connection between the lead wires and the terminal.

[0021] Its working principle is that after the first lead wire 1, the second lead wire 2, the third lead wire 3, the fourth lead wire 4, the fifth lead wire 5 and the sixth lead wire 6 are connected to the first terminal U1, the second terminal U2, the third terminal V1, the fourth terminal V2, the fifth terminal WI and the sixth terminal W2 respectively, the A-phase winding, the B-phase winding and the C-phase winding are connected in series, and the secondary voltage of the transformer BK1 is applied to the C-phase winding. Through the coupling of the stator core of the motor, an induced voltage is generated on the A-phase winding and the B-phase winding. The voltage value of the induced voltage is equal to the voltage value u of the secondary voltage of the transformer BK1;

[0022] If the beginning and end of each winding are correctly connected to each terminal, the indication of the first voltmeter is equal to the indication of the second voltmeter, both of which are 2u;

[0023] If the head and tail ends of the A-phase winding are incorrectly connected to the terminal, the polarity of the induced voltage of the A-phase winding and the B-phase winding is opposite, and the reading of the first voltmeter is zero, while the polarity of the induced voltage of the B-phase winding and the C-phase winding is the same, and the reading of the second voltmeter is 2u;

[0024] If the beginning and end of the B-phase winding are incorrectly connected to the terminal, the polarity of the induced voltage of the A-phase winding and the B-phase winding is opposite, the first voltmeter will indicate zero, and the polarity of the induced voltage of the B-phase winding and the C-phase winding will also be opposite, and the second voltmeter will also indicate zero;

[0025] If the head and tail ends of the C-phase winding are incorrectly connected to the terminal, the polarity of the induced voltage of the A-phase winding and the B-phase winding is the same, and the indication of the first voltmeter is 2u, while the polarity of the induced voltage of the B-phase winding and the C-phase winding is opposite, and the indication of the second voltmeter is zero.

Claims

1. A three-phase motor winding connection detection device, comprising a first voltmeter M1, a second voltmeter M2, and a transformer BK1; characterized in that: One end of the first voltmeter M1 is connected to one end of the secondary of the transformer BK1, and one end of the second voltmeter M2 is connected to the other end of the secondary of the transformer BK1; The other end of the first voltmeter has a second lead wire (2) connected to the second terminal U2, one end of the first voltmeter has a third lead wire (3) connected to the third terminal V1, and one end of the first voltmeter has a sixth lead wire (6) connected to the sixth terminal W2; One end of the second voltmeter has a fifth lead wire (5) connected to the fifth terminal W1, the other end of the second voltmeter has a first lead wire (1) connected to the first terminal U1, and the other end of the second voltmeter has a fourth lead wire (4) connected to the fourth terminal V4; The primary of transformer BK1 is connected to the mains.

2. The wiring detection device for three-phase motor windings according to claim 1, characterized in that: The voltage value u of the secondary voltage of the transformer BK1 is 12 volts.

3. The wiring detection device for three-phase motor windings according to claim 1, characterized in that: The first lead wire (1), the second lead wire (2), the third lead wire (3), the fourth lead wire (4), the fifth lead wire (5) and the sixth lead wire (6) are all provided with wire clamps at their ends.

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