Three-phase motor phase sequence inspection device

Abstract

The invention relates to a three-phase motor phase sequence inspection device which comprises a detection circuit unit, an external connection interface, a power module, a result feedback unit and a shell. The invention relates to the technical field of motor wiring detection. The three-phase motor phase sequence detection device is high in detection safety, is completely operated under power-off and static conditions, thoroughly avoids short circuit, equipment damage and personal safety risks possibly caused by wiring errors in a traditional power-on trial rotation method, remarkably improves the detection efficiency and reliability, automatically completes logic judgment through a circuit, realizes one-key detection, is visual in result, and is convenient to operate. A low-efficiency mode of multiple measurement and manual analysis depending on a universal meter is replaced, the result is objective, and manual misjudgment is completely eradicated.

Description

Technical Field

[0001] This invention relates to the field of motor wiring detection technology, specifically to a device for checking the phase sequence and wiring correctness after a three-phase motor has been wired. Background Technology

[0002] Three-phase motors are widely used in industrial production and daily life. During installation and maintenance, it is essential to correctly connect the six leads (U1, U2, V1, V2, W1, W2) of the motor's internal windings to the terminal block to form a star (Y) or delta (Δ) connection, enabling the motor to run in the preset direction. Correct wiring is a prerequisite for ensuring normal motor startup and operation, and for preventing motor failure, efficiency reduction, and reverse rotation due to phase loss or incorrect phase sequence.

[0003] Currently, after wiring is completed in motor production, the methods for checking whether the wiring is correct usually rely on manual visual inspection to see if the lead wire markings correspond to the terminal block markings, or after installing the connecting pieces (Y-type or △-type), during the motor electrical test, after the motor starts, Hall effect sensors are used to detect the direction of the motor's magnetic field, and the direction of rotation is determined to identify whether the wiring is incorrect.

[0004] However, these two traditional detection methods have many drawbacks: 1. The lead sleeve label or terminal block marking may be incorrect; it should only be used as a reference and not as a standard.

[0005] 2. It is difficult to achieve 100% accuracy through manual visual observation.

[0006] 3. The direction of the magnetic field detected by Hall effect is different depending on the position of the Hall sensor, so the position of the Hall sensor will affect the detection results.

[0007] 4. Hall effect detection of magnetic field direction requires the motor to be fully assembled and started running, which may not detect wiring errors in time.

[0008] Therefore, there is an urgent need in this field for a dedicated testing device that can quickly, accurately, and intuitively determine whether the wiring of a three-phase motor is correct, and can effectively reduce the reliance on the operator's technical skills. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a three-phase motor phase sequence checking device. The purpose is to provide a device that, after the wiring process of a three-phase motor is completed, can quickly, effectively, and intuitively determine whether the installation positions of U1, V1, W1 and U2, V2, W2 on the terminal block are correct, thereby ensuring the normal start-up and operation of the motor.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solution: a three-phase motor phase sequence checking device, comprising a detection circuit unit, an external connection interface, a power supply module, a result feedback unit, and a housing; The detection circuit unit is electrically connected to the external connection interface and is used to automatically determine whether the wiring of the three-phase motor conforms to the preset correct wiring logic.

[0011] The result feedback unit is electrically connected to the detection circuit unit and is used to receive and feedback the judgment result of the detection circuit unit. When the judgment result indicates that the wiring is correct, the result feedback unit is triggered to issue a prompt signal; When the judgment result is a wiring error, the result feedback unit remains in a non-triggered state.

[0012] As a further aspect of the present invention: the preset correct wiring logic is: each of the three phases, U1-U2, V1-V2, and W1-W2, is conducting; the detection circuit unit includes: A power supply is connected in series with the detection circuit of the detection circuit unit to provide current to the detection circuit; An LED light, connected in parallel with the detection circuit, is used to provide feedback on whether the power supply is working, and also to provide feedback on whether the detection result is "line fault" or "wiring error". A detection circuit, connected in series with the aforementioned power supply, is used to process the wiring test results of the three-phase motor. The detection circuit consists of three independent detection loops connected in series, each of which includes: A power source, connected in series in the independent detection circuit, provides current to the circuit. A current-limiting resistor is connected in series in the independent detection circuit to limit the circuit current; An LED on the input side of the optocoupler is connected in series in the independent detection circuit, serving to feed back the on / off result of the independent detection circuit to the output side of the optocoupler, causing the output side to be disconnected or turned on. Two detection contacts are connected in series in the independent detection circuit to detect whether the two ends of the corresponding coil of the three-phase motor are correctly connected on the terminal block.

[0013] Three independent detection loops are connected in series to form a large loop, which includes: The optocoupler outputs of three independent detection circuits are connected in series in the circuit to provide feedback on whether the wiring status of the three-phase motor is correct. A power source, connected in series in the circuit, provides current to the circuit; A buzzer, connected in parallel in the circuit, is used to directly provide feedback on whether the wiring status of the three-phase motor is correct; A current-limiting resistor, connected in series with an LED and then in parallel in the circuit, is used to limit the current in the series circuit. An LED, connected in series with the aforementioned current-limiting resistor and then in parallel in the circuit, serves as direct feedback to determine whether the wiring status of the three-phase motor is correct.

[0014] As a further aspect of the present invention, the detection circuit unit comprises three groups.

[0015] As a further aspect of the present invention, the result feedback unit includes a buzzer and at least one LED indicator.

[0016] As a further aspect of the present invention: the external connection interface includes a set of adaptive connection interface components, which include: A six-hole insulating base, which has six mounting holes; Six resilient conductive contacts are correspondingly disposed in six mounting holes. The resilient conductive contacts include: A conductive screw, the conductive screw being used to contact the terminal block on the motor; A spring is fitted onto the conductive screw; A locking nut engages with the threaded portion of the conductive screw, and pre-tightens the conductive screw onto the six-hole insulating base; The tail of the conductive screw is electrically connected to the detection circuit unit via a wire; The spring provides independent elastic travel for the head of the conductive screw to compensate for possible height manufacturing or installation errors between multiple terminals on the same motor terminal block, thereby ensuring that all six contacts can obtain reliable electrical contact simultaneously.

[0017] As a further aspect of the present invention: the power module includes a power switch and a power indicator light. The power indicator light is used to indicate the power-on status of the device, and at the same time, when the detection result is a wiring error, it provides a diagnostic direction of "device failure" and "wiring error".

[0018] As a further aspect of the present invention: the surface of the outer casing is provided with an observation window for indicating the working status of the device; The housing has a first mounting hole for mounting a result feedback indicator light, a second mounting hole for mounting a power indicator light, a third mounting hole for mounting a power switch, a first mounting position for mounting a detection unit circuit board, a fourth mounting hole for mounting a buzzer, and a second mounting position for mounting a power supply. The external connection interface is mounted on the housing in a retractable manner.

[0019] Compared with the prior art, the present invention has the following advantages: 1. High testing safety: It operates entirely under power-off and static conditions, completely avoiding the risks of short circuits, equipment damage, and personal safety that may be caused by wiring errors in the traditional power-on testing method.

[0020] 2. Significantly improved detection efficiency and reliability: The circuit automatically completes the logical judgment, realizing one-click detection and intuitive results (audio-visual prompts), replacing the inefficient mode of relying on multiple measurements with a multimeter and manual analysis, and the results are objective, eliminating human error.

[0021] 3. Wider range of applications and lower operating threshold: Not only can bare wires be pre-inspected before the final assembly of the motor, simplifying later debugging, but the operation is also simple and does not require the operator to have in-depth electrical knowledge, thus lowering the threshold for use.

[0022] High degree of functional integration: The adaptive connection interface, isolation detection circuit and audible and visual indication are integrated into a portable handheld device, which realizes comprehensive judgment of various wiring errors such as phase loss and phase reversal. It has a high degree of tool-likeness and is easy to use in the field. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the three-phase motor phase sequence checking device of the present invention; Figure 2 This is a schematic diagram of the detection circuit unit in this invention; Figure 3 This is a schematic diagram of the external connection interface in this invention. Figure 4 This is a schematic diagram of the outer shell in this invention.

[0024] In the diagram: 1. Insulating base; 2. Spring; 3. Locking nut; 4. Conductive screw; 5. First mounting hole; 6. Second mounting hole; 7. Third mounting hole; 8. First mounting position; 9. Fourth mounting hole; 10. Second mounting position; 11. External connection interface. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0026] Please see Figure 1-4 The three-phase motor phase sequence checking device of the present invention includes a detection circuit unit, an external connection interface 11, a power supply module, a result feedback unit and a housing; The detection circuit unit is electrically connected to the external connection interface 11 and is used to automatically determine whether the wiring of the three-phase motor conforms to the preset correct wiring logic.

[0027] The result feedback unit is electrically connected to the detection circuit unit and is used to receive and feedback the judgment result of the detection circuit unit. When the judgment result indicates that the wiring is correct, the result feedback unit is triggered to issue a prompt signal; When the judgment result is a wiring error, the result feedback unit remains in a non-triggered state.

[0028] The default correct wiring logic is: each of the three phases, U1-U2, V1-V2, and W1-W2, is conducting. The detection circuit unit includes: A power supply is connected in series with the detection circuit of the detection circuit unit to provide current to the detection circuit; An LED light, connected in parallel with the detection circuit, is used to provide feedback on whether the power supply is working, and also to provide feedback on the detection result as "circuit fault" or "wiring error". A detection circuit, connected in series with the aforementioned power supply, is used to process the wiring test results of the three-phase motor. The detection circuit consists of three independent detection loops connected in series, each of which includes: A power supply is connected in series in the independent detection circuit to provide current to the circuit; A current-limiting resistor is connected in series in the independent detection circuit to limit the circuit current; An LED on the input side of the optocoupler is connected in series in the independent detection circuit. This LED is used to feed back the on / off result of the independent detection circuit to the output side of the optocoupler, causing the output side to be disconnected or turned on. Two detection contacts are connected in series in an independent detection circuit to detect whether the two ends of the corresponding coil of the three-phase motor are correctly connected on the terminal block.

[0029] Three independent detection loops are connected in series to form a large loop, which includes: The optocoupler outputs of three independent detection circuits are connected in series in the circuit to provide feedback on whether the wiring status of the three-phase motor is correct. A power source, connected in series in the circuit, provides current to the circuit; A buzzer, connected in parallel in the circuit, is used to directly provide feedback on whether the wiring status of the three-phase motor is correct; A current-limiting resistor, connected in series with an LED and then in parallel in the circuit, is used to limit the current in the series circuit. An LED, connected in series with the aforementioned current-limiting resistor, is then connected in parallel in the circuit to provide direct feedback on whether the wiring status of the three-phase motor is correct.

[0030] The detection circuit unit consists of three groups.

[0031] The result feedback unit includes a buzzer and at least one LED indicator.

[0032] External connection interface 11 includes a set of adaptive connection interface components, which include: A six-hole insulating base 1, which has six mounting holes; Six resilient conductive contacts are correspondingly disposed in six mounting holes. The resilient conductive contacts include: A conductive screw 4 is used to contact the terminal block on the motor's terminal block. A spring 2 is fitted onto a conductive screw 4; A locking nut 3 engages with the threaded portion of a conductive screw 4, and pre-tightens the conductive screw 4 onto the six-hole insulating base 1; The tail of the conductive screw 4 is electrically connected to the detection circuit unit via a wire; Spring 2 is used to provide independent elastic travel for the head of conductive screw 4 to compensate for possible height manufacturing or installation errors between multiple terminals on the same motor terminal block, thereby ensuring that all six contacts can obtain reliable electrical contact simultaneously.

[0033] The power module includes a power switch and a power indicator light. The power indicator light is used to indicate the power-on status of the device, and also provides diagnostic options of "device malfunction" and "wiring error" when the detection result is a wiring error.

[0034] The surface of the casing is provided with an observation window for indicating the working status of the device; The housing has a first mounting hole 5 for mounting a result feedback indicator light, a second mounting hole 6 for mounting a power indicator light, a third mounting hole 7 for mounting a power switch, a first mounting position 8 for mounting a detection unit circuit board, a fourth mounting hole 9 for mounting a buzzer, and a second mounting position 10 for mounting a power supply. The external connection interface 11 is mounted on the housing in a retractable manner.

[0035] Please see Figure 2 The detection circuit unit consists of three completely independent detection loops on the left and three independent detection loops on the right connected in series to form a large loop.

[0036] Each detection circuit consists of a power supply (BT), a current-limiting resistor (R), an LED on the input side of the optocoupler (U), contact 1, and contact 2. When current is input to the power supply BT, it flows through the current-limiting resistor R to the positive terminal of the LED on the input side of the optocoupler U, then through the LED and out to the detection contact 2 from the negative terminal. When the circuit is closed, the current returns to the negative terminal of the power supply through the detection contact 1. Only when contacts 1 and 2 of each circuit are connected is the corresponding circuit closed, the LED on the input side of the corresponding circuit activated, and the output side of the optocoupler becomes closed.

[0037] The three circuits are then connected in series to form an output drive circuit, which consists of a power supply (BT4), the output sides of optocouplers U1, U2, and U3, a buzzer, a resistor R4, and an LED1. When all three independent circuits on the left are open, the current input to the power supply BT4 flows through the output side of the first circuit optocoupler U1 to the output side of the second circuit optocoupler, then through the second circuit optocoupler to the output side of the third circuit optocoupler. After passing through the third circuit optocoupler, the current enters a parallel circuit consisting of the buzzer and LED1 & current-limiting resistor R4, and finally reaches the negative terminal of the power supply through the parallel circuit, forming a complete large circuit.

[0038] The detection contacts COIL1-1, COIL1-2, COIL2-1, COIL2-2, COIL3-1, and COIL3-2 of the three independent circuits are connected as follows: the detection contacts COIL1-1 and COIL1-2 of the first circuit are connected to the U1 and U2 detection contacts of the detection device, respectively; the detection contacts COIL2-1 and COIL2-2 of the second circuit are connected to the V1 and V2 detection contacts of the detection device, respectively; and the detection contacts COIL3-1 and COIL3-2 of the third circuit are connected to the W1 and W2 detection contacts of the detection device, respectively.

[0039] When the three-phase motor is correctly wired, U1, U2, V1, V2, W1, and W2 are connected to the corresponding contacts U1, U2, V1, V2, W1, and W2 of the detection device. Then, the U-phase coil of the three-phase motor connects contacts COIL1-1 and COIL1-2, completing the first circuit; the V-phase coil connects contacts COIL2-1 and COIL2-2, completing the second circuit; and the W-phase coil connects contacts COIL3-1 and COIL3-2, completing the third circuit. After all three independent detection circuits are connected, the right-side main circuit becomes a closed circuit. The buzzer and LED1, connected in parallel to the right-side main circuit, are energized. The buzzer sounds, and LED1 lights up, indicating correct wiring.

[0040] When a three-phase motor is incorrectly wired, i.e., one phase is disconnected or two phases are wired in a cross configuration, one or two of the three independent detection circuits will be disconnected. In this case, the right-side main circuit will not be able to conduct, the buzzer and LED1 will both respond, and only the power supply indicator light will light up, indicating that the wiring is incorrect.

[0041] To use, first turn on the power switch; the green power indicator light will illuminate. Then, align the six self-adaptive conductive screws at the bottom of the device with the six terminals U1, V1, W1, U2, V2, and W2 on the motor terminal block, and press down on the outer casing. Under the action of the springs, each screw head will extend and retract independently, ensuring good contact with terminals of varying heights.

[0042] If the motor wiring is completely correct (i.e., each of the three phases, U1-U2, V1-V2, and W1-W2, is conducting), then the test indicator light will remain on and the buzzer will emit a continuous beep.

[0043] If incorrect wiring occurs, such as reversing U1 and V1, neither the indicator light nor the buzzer will respond. In this case, only the power indicator light will illuminate, clearly indicating a wiring error.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A three-phase motor phase sequence checking device, characterized in that: It includes a detection circuit unit, an external connection interface (11), a power supply module, a result feedback unit, and a housing; The detection circuit unit is electrically connected to the external connection interface (11) and is used to automatically determine whether the wiring of the three-phase motor conforms to the preset correct wiring logic. The result feedback unit is electrically connected to the detection circuit unit and is used to receive and feedback the judgment result of the detection circuit unit.

2. The three-phase motor phase sequence checking device according to claim 1, characterized in that, The wiring logic is as follows: each of the three phases, U1-U2, V1-V2, and W1-W2, is conducting. The detection circuit unit includes: A power supply is connected in series with the detection circuit of the detection circuit unit to provide current to the detection circuit; An LED light, connected in parallel with the detection circuit, is used to provide feedback on whether the power supply is working, and also to provide feedback on whether the detection result is "line fault" or "wiring error"; A detection circuit, connected in series with the aforementioned power supply, is used to process the wiring test results of the three-phase motor. The detection circuit consists of three independent detection loops connected in series, each of which includes: A power source, connected in series in the independent detection circuit, provides current to the circuit. A current-limiting resistor is connected in series in the independent detection circuit to limit the circuit current; An input-side LED is connected in series in the independent detection circuit to feed back the on / off result of the independent detection circuit to the output side of the optocoupler, causing the output side to be disconnected or turned on. Two detection contacts are connected in series in the independent detection circuit to detect whether the two ends of the corresponding coil of the three-phase motor are correctly connected on the terminal block; Three independent detection loops are connected in series to form a large loop, which includes: The optocoupler outputs of three independent detection circuits are connected in series in the circuit to provide feedback on whether the wiring status of the three-phase motor is correct. A power source, connected in series in the circuit, provides current to the circuit; A buzzer, connected in parallel in the circuit, is used to directly provide feedback on whether the wiring status of the three-phase motor is correct; A current-limiting resistor, connected in series with an LED and then in parallel in the circuit, is used to limit the current in the series circuit. An LED, connected in series with the aforementioned current-limiting resistor and then in parallel in the circuit, serves as direct feedback to determine whether the wiring status of the three-phase motor is correct.

3. The three-phase motor phase sequence checking device according to claim 1, characterized in that, The detection circuit unit comprises three groups.

4. The three-phase motor phase sequence checking device according to claim 1, characterized in that, The result feedback unit includes a buzzer and at least one LED indicator.

5. The three-phase motor phase sequence checking device according to claim 1, characterized in that, The external connection interface (11) includes a set of adaptive connection interface components, which include: An insulating base (1) has six mounting holes; Six resilient conductive contacts are correspondingly disposed in six mounting holes. The resilient conductive contacts include: A conductive screw (4) is used to contact the terminal block on the motor. Spring (2) is sleeved on the conductive screw (4); The locking nut (3) engages with the threaded portion of the conductive screw (4) and pre-tightens the conductive screw (4) onto the insulating base (1); The tail of the conductive screw (4) is electrically connected to the detection circuit unit via a wire.

6. The three-phase motor phase sequence checking device according to claim 1, characterized in that, The power module includes a power switch and a power indicator light. The power indicator light is used to indicate the power-on status of the device and, when the detection result is a wiring error, provides a diagnostic direction of "device failure" or "wiring error".

7. The three-phase motor phase sequence checking device according to claim 1, characterized in that, The surface of the casing is provided with an observation window for indicating the working status of the device; The housing has a first mounting hole (5) for mounting a result feedback indicator light, a second mounting hole (6) for mounting a power indicator light, a third mounting hole (7) for mounting a power switch, a first mounting position (8) for mounting a detection unit circuit board, a fourth mounting hole (9) for mounting a buzzer, and a second mounting position (10) for mounting a power supply. The external connection interface (11) is mounted on the housing in a retractable manner.

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