CN210629088U - Three-phase five-wire system motor open-phase detection device and system thereof - Google Patents
Three-phase five-wire system motor open-phase detection device and system thereof Download PDFInfo
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- CN210629088U CN210629088U CN201921690743.0U CN201921690743U CN210629088U CN 210629088 U CN210629088 U CN 210629088U CN 201921690743 U CN201921690743 U CN 201921690743U CN 210629088 U CN210629088 U CN 210629088U
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- 238000011897 real-time detection Methods 0.000 abstract description 3
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Abstract
The utility model discloses a three-phase five-wire system motor lacks looks detection device and system thereof, include: the current sampling module is used for sampling the current flowing through the zero line of the three-phase motor; the voltage conversion module is connected with the current sampling module; the rectifying module is connected with the voltage conversion module; the filtering module is connected with the rectifying module; and the input end of the open-phase judgment module is connected with the filtering module, and the output end of the open-phase judgment module is used for being connected to a three-phase motor. The technical scheme of the utility model simple structure, response speed is fast, through adopting current sampling module, voltage conversion module, rectifier module, filtering module and scarce looks judgement module, realizes the scarce looks running state of real-time detection motor.
Description
Technical Field
The utility model relates to a motor detection area, in particular to three-phase five-wire system motor lacks looks detection device and system thereof.
Background
As a device for converting electric energy and mechanical energy, the motor converts the electric energy in a power distribution network into the mechanical energy in practical production application, thereby replacing manpower to achieve the purpose of automatic production. In industrial applications, due to the requirement of high-power electric machines, electric machines consisting of three-phase stator windings are generally used.
In order to avoid the phase-failure operation of the motor, a fuse is usually connected into a three-phase power supply, and a mechanism of fuse blowing is adopted to protect the motor, but the method has no way of distinguishing whether the fuse blowing is caused by the short circuit of the motor or the phase-failure operation of the motor, so that the difficulty is increased for a maintenance worker to determine the cause of the motor failure; for monitoring the running state of the three-phase motor by adopting the voltage of the transformer, the voltage detection device can only check and connect the state of the circuit before the junction, so the scheme can not completely reflect various possible states of the three-phase power supply during the phase failure, and the scheme needs three detection branches, so the cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a three-phase five-wire system motor lacks looks detection device, simple structure, response speed is fast, can the lack looks running state of real-time detection three-phase five-wire system motor.
The utility model discloses still provide a system of having above-mentioned three-phase five-wire system motor and lacking looks detection device.
According to the utility model discloses five line system motor of three-phase system lack looks detection device of first aspect embodiment, include: the current sampling module is used for sampling the current flowing through the zero line of the three-phase motor; the voltage conversion module is connected with the current sampling module; the rectifying module is connected with the voltage conversion module; the filtering module is connected with the rectifying module; and the input end of the open-phase judgment module is connected with the filtering module, and the output end of the open-phase judgment module is used for being connected to a three-phase motor.
According to the utility model discloses the five-wire system of three-phase motor of first aspect embodiment lacks looks detection device has following beneficial effect at least: the utility model discloses a three-phase five-wire system motor lacks looks detection device, compare prior art's technical scheme, the technical scheme of the utility model pass through current sampling module and sample the electric current that flows through three-phase motor zero line, pass through the current conversion that voltage conversion module will sample again and become voltage signal, later with voltage signal through rectifier module rectification, obtain the pulsating voltage waveform, rethread filtering wave module filtering pulsation composition, obtain the voltage of direct current component, last lack looks judgement module carries out the comparison according to the voltage signal and the reference voltage of filtering module output, according to comparative result analysis three-phase motor running state, be in under the lack looks state at three-phase motor, send control signal and make three-phase motor stall, and the electric pressure measuring instrument has the advantages of simple structure, low cost, high reliability.
According to some embodiments of the invention, the current sampling module comprises a current transformer.
According to some embodiments of the invention, the voltage conversion module is provided with a power resistor.
According to some embodiments of the invention, the rectifier module comprises more than one diode.
According to some embodiments of the invention, the filtering module is provided with a low pass filter.
According to the utility model discloses a some embodiments, open phase judgement module is used for the basis the voltage of filtering module output and reference voltage's ratio, the response is sent out the control signal who makes three-phase motor bring to rest.
According to some embodiments of the utility model, still including connect in the trigger and the alarm of default phase judgement module, the trigger control the alarm.
According to the utility model discloses three-phase five-wire system motor lacks looks detecting system of second aspect embodiment, include three-phase motor and according to the utility model discloses the three-phase five-wire system motor of above-mentioned first aspect embodiment lacks looks detecting device, the input of current sampling module is connected to through the zero line three-phase motor, lack looks judgement module output with three-phase motor links to each other.
According to the utility model discloses the phase lack detecting system of three-phase five-wire system motor of second aspect embodiment has following beneficial effect at least: the three-phase motor phase-loss detection device is connected with a zero line and a three-phase motor through the current sampling module, detects the running state of the three-phase motor in real time through the three-phase five-wire system motor phase-loss detection device, sends out a control signal to stop the running of the three-phase motor and trigger an alarm when the three-phase motor is in the phase-loss state, and has the characteristics of simple structure and high response speed.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a phase loss detection device for a three-phase five-wire motor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-phase-loss protection system for a fuse blowing mechanism provided in the prior art;
fig. 3 is a schematic structural diagram of a three-phase motor open-phase detection control system based on voltage detection provided in the prior art;
fig. 4 is a schematic structural diagram of a three-phase five-wire system motor open-phase detection system according to the embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, etc., is the orientation or positional relationship shown on the drawings, and is only for convenience of description and simplification of description, and does 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 thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1, according to the utility model discloses three-phase five-wire system motor phase loss detection device of first aspect embodiment includes:
the current sampling module 100 is used for sampling current flowing through a zero line of the three-phase motor;
the voltage conversion module 110 is connected with the current sampling module 100;
a rectifying module 120 connected to the voltage converting module 110;
the filtering module 130 is connected with the rectifying module 120;
and the input end of the open-phase judgment module 140 is connected with the filtering module 130, and the output end of the open-phase judgment module is used for being connected to a three-phase motor.
Specifically, the current sampling module 100 samples a current flowing through a zero line of the three-phase motor in real time, the voltage conversion module 110 converts the sampled current into a voltage signal, the voltage signal is rectified by the rectification module 120 to obtain a ripple voltage waveform, the filter module 130 filters out ripple components in the ripple voltage waveform to obtain a voltage of a direct current component, the open-phase judgment module 140 compares the voltage output by the filter module 130 with a reference voltage, analyzes an operation state of the three-phase motor according to a comparison result, and sends a control signal to stop the operation of the three-phase motor when the three-phase motor is in the open-phase state.
In addition, referring to fig. 2, three fuses are respectively connected in series to each branch of the three-phase power supply, when the current of a certain phase of motor increases, the temperature rises, and the fuses are fused, so as to achieve the purpose of protecting the three-phase motor.
Referring to fig. 3, three groups of voltage sampling modules are connected in parallel to each phase branch of a three-phase motor, when an electric wire corresponding to a certain phase stator of the motor is open-circuited, no detection voltage is available, and voltages of the other two phases are kept in a normal state, and three sampled voltage signals are subjected to certain waveform conversion and then transmitted to a logic judgment module, so that the three-phase motor makes a corresponding response.
In the phase loss detection device for the three-phase five-wire motor of the embodiment, the current sampling module 100, the voltage conversion module 110, the rectification module 120, the filtering module 130 and the phase loss judgment module 140 are sequentially connected to the zero line of the three-phase motor, the current sampling module 100 is used for sampling current flowing through a zero line of the three-phase motor, the voltage conversion module 110 is used for converting the sampled current into a voltage signal, the rectification module 120 is used for rectifying the voltage signal to obtain a pulsating voltage waveform containing a direct current component, the filtering module 130 is used for filtering pulsating components in the voltage waveform to obtain the direct current component, the open-phase judgment module 140 is used for responding to a control signal for stopping the three-phase motor according to the ratio of the direct current component to reference voltage to realize real-time detection of the running state of the three-phase motor, and the three-phase motor has the characteristics of simple structure, low cost and strong reliability.
In some embodiments of the present invention, the current sampling module 100 includes a current transformer. The current flowing through the zero line of the three-phase motor is sampled according to a certain proportion by utilizing a current transformer, wherein the working principle of the current transformer is as follows: the current flowing through the primary coil is subjected to equal-proportion transformation, for example, when the current amplitude of the primary coil is increased, the current flowing through the secondary coil is increased; as the magnitude of the primary coil current decreases, the current flowing through the secondary coil decreases. In this embodiment, the detection is achieved by reducing the current flowing through the secondary coil in order to protect the motor from safety.
Specifically, the three-phase motor is in a normal working state, the sum of current vectors flowing through the three-phase balance load is zero, and no current flows through a zero line; when the three-phase load is unbalanced, for example, a certain phase circuit of the three-phase motor is open, the sum of current vectors flowing through the three-phase balanced load is no longer zero, and a net current flows through the zero line.
In some embodiments of the present invention, the voltage conversion module 110 is provided with a power resistor. The voltage conversion module 110 is configured to convert the sampled current flowing through the zero line of the three-phase motor into a voltage signal, so as to further perform waveform processing on the voltage signal; in this embodiment, since the current transformer cannot be connected to an excessive load, the voltage conversion module 110 simultaneously limits the resistance on one side of the secondary coil of the current transformer, thereby protecting the current transformer from being burnt out and playing a role in protecting a circuit.
In some embodiments of the present invention, the rectifier module 120 includes more than one diode. The rectifying module 120 is configured to rectify the voltage signal to obtain a pulsating voltage waveform containing a dc component, that is, half-wave or full-wave rectification is performed on the voltage signal by using a nonlinear characteristic of unidirectional conduction of a diode. Since the flowing direction of the alternating current is repeatedly and alternately changed, and the direct current flows in a single direction, the current can be converted into the current in one direction according to the one-way conduction characteristic of the diode. In another embodiment, half-wave rectification outputs half of the current signal and the other half by using one diode; in other embodiments, full-wave rectification is achieved by converting all waveforms in the alternating current into a single direction of current through four diodes. It is also necessary to add a filter capacitor after the circuit to filter out the rectified noise.
In some embodiments of the present invention, the filtering module 130 is provided with a low pass filter. The filtering module 130 is configured to filter out a pulsating component in the voltage waveform to obtain a dc component. The pulse component in the rectified voltage waveform is filtered by the low-pass filter, the direct-current component is obtained, the signal is selected according to the frequency, and the interference of the high-frequency signal is avoided.
In some embodiments of the present invention, the open-phase determining module 140 is configured to respond to a control signal for stopping the operation of the three-phase motor according to a ratio of the voltage outputted by the filtering module to the reference voltage. Specifically, the open-phase determining module is a zero-crossing comparator and a related control device, and compares the voltage output by the filtering module with a reference voltage, analyzes the balance state of the load of the three-phase motor, and makes different responses to different operating states, for example, when the three-phase motor is in the open-phase state, the comparator outputs a high level to control the related control device and sends a control signal. In this embodiment, when the three-phase motor is in the phase-loss state, the phase-loss determining module 140 sends a signal to stop the three-phase motor, and cuts off the power supply of the three-phase motor, and simultaneously stops sampling the current until the power supply is turned on again.
In some embodiments of the present invention, the system further comprises a trigger and an alarm connected to the open-phase determining module 140, wherein the trigger controls the alarm. Specifically, when the three-phase motor is in the phase-failure state, the phase-failure determining module 140 sends a signal for stopping the three-phase motor, and controls the alarm to alarm through the trigger, so as to play a warning role, so that the maintenance personnel can find the motor fault and maintain the motor in time.
Referring to fig. 4, according to the utility model discloses three-phase five-wire system motor lacks looks detecting system of second aspect embodiment, including three-phase motor 200 and according to the utility model discloses the three-phase five-wire system motor of above-mentioned first aspect embodiment lacks looks detecting device, and current sampling module 100's input is connected to three-phase motor 200 through the zero line, lacks looks judgement module 140 output and links to each other with three-phase motor 200.
In this embodiment, since the three-phase five-wire motor phase loss detection system is provided with the three-phase five-wire motor phase loss detection device in any one of the above embodiments, the three-phase five-wire motor phase loss detection system in this embodiment has the beneficial effects and functional characteristics brought by the three-phase five-wire motor phase loss detection device in any one of the above embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "specifically," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. The utility model provides a three-phase five-wire system motor lacks looks detection device which characterized in that includes:
the current sampling module is used for sampling the current flowing through the zero line of the three-phase motor;
the voltage conversion module is connected with the current sampling module;
the rectifying module is connected with the voltage conversion module;
the filtering module is connected with the rectifying module;
and the input end of the open-phase judgment module is connected with the filtering module, and the output end of the open-phase judgment module is used for being connected to a three-phase motor.
2. The open-phase detection device for a three-phase five-wire motor according to claim 1, characterized in that: the current sampling module comprises a current transformer.
3. The open-phase detection device for a three-phase five-wire motor according to claim 1, characterized in that: the voltage conversion module is provided with a power resistor.
4. The open-phase detection device for a three-phase five-wire motor according to claim 1, characterized in that: the rectifying module comprises more than one diode.
5. The open-phase detection device for a three-phase five-wire motor according to claim 1, characterized in that: the filtering module is provided with a low-pass filter.
6. The open-phase detection device for a three-phase five-wire motor according to claim 1, characterized in that: and the open-phase judgment module is used for responding and sending out a control signal for stopping the three-phase motor according to the ratio of the voltage output by the filtering module to the reference voltage.
7. The open-phase detection device for a three-phase five-wire motor according to claim 1 or 6, characterized in that: the phase-failure detection device is characterized by further comprising a trigger and an alarm, wherein the trigger is connected with the phase-failure judgment module and controls the alarm.
8. The utility model provides a three-phase five-wire system motor lacks looks detecting system which characterized in that: the open-phase detection device comprises a three-phase motor and the three-phase five-wire motor open-phase detection device according to any one of claims 1 to 7, wherein the input end of the current sampling module is connected to the three-phase motor through a zero line, and the output end of the open-phase judgment module is connected with the three-phase motor.
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| CN201921690743.0U CN210629088U (en) | 2019-10-10 | 2019-10-10 | Three-phase five-wire system motor open-phase detection device and system thereof |
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| CN201921690743.0U CN210629088U (en) | 2019-10-10 | 2019-10-10 | Three-phase five-wire system motor open-phase detection device and system thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829380A (en) * | 2019-10-10 | 2020-02-21 | 广东智科电子股份有限公司 | Three-phase five-wire system motor open-phase detection device and system thereof |
| CN117269756A (en) * | 2023-09-08 | 2023-12-22 | 东风商用车有限公司 | Motor open-phase detection method and device and electronic equipment |
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2019
- 2019-10-10 CN CN201921690743.0U patent/CN210629088U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829380A (en) * | 2019-10-10 | 2020-02-21 | 广东智科电子股份有限公司 | Three-phase five-wire system motor open-phase detection device and system thereof |
| CN117269756A (en) * | 2023-09-08 | 2023-12-22 | 东风商用车有限公司 | Motor open-phase detection method and device and electronic equipment |
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