CN110601142A - Three-phase motor open-phase monitoring control device based on current sampling and system thereof - Google Patents
Three-phase motor open-phase monitoring control device based on current sampling and system thereof Download PDFInfo
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- CN110601142A CN110601142A CN201910865800.2A CN201910865800A CN110601142A CN 110601142 A CN110601142 A CN 110601142A CN 201910865800 A CN201910865800 A CN 201910865800A CN 110601142 A CN110601142 A CN 110601142A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 51
- 238000001914 filtration Methods 0.000 claims abstract description 57
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- 239000003990 capacitor Substances 0.000 claims description 4
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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Abstract
The invention discloses a three-phase motor open-phase monitoring control device based on current sampling and a system thereof, wherein the three-phase motor open-phase monitoring control device comprises a first current sampling module, a first voltage conversion module, a first rectification module and a first filtering module; the second current sampling module, the second voltage conversion module, the second rectification module and the second filtering module; the third current sampling module, the third voltage conversion module, the third rectification module, the third filtering module and the logic judgment module. According to the technical scheme, the running state of the three-phase motor is monitored in real time through the current sampling module, the voltage conversion module, the rectification module, the filtering module and the logic judgment module, and the three-phase motor monitoring system has the characteristics of simple structure, strong performance and the like.
Description
Technical Field
The invention relates to the field of monitoring and control, in particular to a three-phase motor open-phase monitoring control device and a system thereof based on current sampling.
Background
In the field of industrial application, due to the requirement of a high-power motor, a motor formed by a three-phase stator winding is generally adopted, and after three-phase alternating current is connected to the motor, a stator generates a magnetic field rotating at a constant speed. According to the electromagnetic induction law, a rotor coil arranged in the magnetic field generates induction current, and then the current-carrying rotor generates electromagnetic force under the action of a rotating magnetic field, so that electromagnetic torque is generated on a rotating shaft of the motor, and the motor is driven to rotate. Compared with a single-phase motor, the three-phase motor has large starting torque and small starting current, and is more suitable for application in a high-power scene.
When one phase of the three-phase power supply is broken, if the switch is in poor contact, the three-phase motor still has starting torque, so that the motor can still run, namely phase-failure running. However, the rotation speed of the motor is reduced, the stator current of the other two phases is increased, and the temperature rise is easily generated in the other two phases to burn out the motor winding, so that the three-phase motor is not allowed to operate in a phase-lacking state under a normal condition. In addition, since high-power motors are usually high in cost, the burning of the motor will cause immeasurable economic loss to the motor user, and therefore, the motor should be operated in a rated working state from the economic cost viewpoint.
In order to avoid the phase-loss operation of the motor, a fuse is usually connected to the three-phase power supply, and the motor is protected by adopting a mechanism of fusing the fuse. However, this method has no way of distinguishing whether the fuse blow is due to a short circuit of the motor or due to a phase loss operation of the motor, which adds difficulty to maintenance personnel in determining the cause of the motor failure. In addition, when the motor runs in a phase loss state, the increased current is far less than the current generated when the motor is in a short circuit state, and the current increased by the motor in the phase loss state is not enough to fuse the fuse within a period of time, so that the protection mechanism fails. For the scheme of 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 point, so the scheme cannot completely reflect various possible states of the three-phase power supply during the phase failure operation.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a current sampling-based open-phase monitoring and controlling device for a three-phase motor and a system thereof, which can monitor the operating state of each phase of the three-phase motor in real time, and have a simple structure and high performance.
The technical scheme adopted by the invention for solving the problems is as follows:
the invention provides a current sampling-based three-phase motor open-phase monitoring control device, which comprises a first current sampling module, a first voltage conversion module, a first rectification module and a first filtering module, wherein the first current sampling module is connected with the first voltage conversion module; the second current sampling module, the second voltage conversion module, the second rectification module and the second filtering module; the third current sampling module, the third voltage conversion module, the third rectification module, the third filtering module and the logic judgment module;
the first current sampling module, the second current sampling module and the third current sampling module are respectively used for collecting the current of each phase of the three-phase power supply; the first current sampling module is connected to the first filtering module sequentially through the first voltage conversion module and the first rectifying module; the second current sampling module is connected to the second filtering module sequentially through the second voltage conversion module and the second rectifying module; the third current sampling module is connected to the third filtering module sequentially through the third voltage conversion module and the third rectifying module; the input end of the logic judgment module is connected with the first filtering module, the second filtering module and the third filtering module; and the output end of the logic judgment module is used for being connected to a three-phase motor.
According to the current sampling-based three-phase motor open-phase monitoring control device in the first aspect of the invention, the first current sampling module, the second current sampling module and the third current sampling module are respectively used for sampling alternating current flowing through each phase stator of the three-phase motor;
the first voltage conversion module, the second voltage conversion module and the third voltage conversion module are respectively used for converting the sampled alternating current of each phase stator of the three-phase motor into alternating voltage;
the first rectifying module, the second rectifying module and the third rectifying module are respectively used for rectifying the alternating-current voltage to obtain voltage waveforms of three direct-current components;
the first filtering module, the second filtering module and the third filtering module are respectively used for filtering pulsating alternating current components in the three voltage waveforms, outputting direct current components, and converting the direct current components into digital signals through an analog-digital converter to form three paths of digital bit streams;
and the logic judgment module is used for responding and sending out a control signal for stopping the three-phase motor according to the three paths of digital bit streams.
According to the current sampling-based three-phase motor open-phase monitoring control device in the first aspect of the invention, the first current sampling module, the second current sampling module and the third current sampling module are all composed of current transformers.
According to the current sampling-based three-phase motor open-phase monitoring control device in the first aspect of the invention, the first voltage conversion module, the second voltage conversion module and the third voltage conversion module are all composed of power resistors.
According to the current sampling-based open-phase monitoring and controlling device for the three-phase motor, the first rectifying module, the second rectifying module and the third rectifying module are all composed of more than one diode.
According to the current sampling-based three-phase motor phase loss monitoring and controlling device in the first aspect of the invention, the first filtering module, the second filtering module and the third filtering module all comprise low-pass filters composed of resistors, capacitors and inductors.
According to the current sampling-based three-phase motor open-phase monitoring control device in the first aspect of the invention, the logic judgment module is configured to issue a control signal for stopping the operation of the three-phase motor according to the three-way digital bit stream response, and the logic judgment module is configured to trigger an alarm and stop the operation of the three-phase motor.
According to the first aspect of the invention, the current sampling-based three-phase motor open-phase monitoring control device further comprises a signal indicator lamp connected to the logic judgment module.
In a second aspect of the present invention, a three-phase motor open-phase monitoring control system based on current sampling is provided, including a three-phase power supply, a three-phase motor, and the three-phase motor open-phase monitoring control device based on current sampling in the first aspect, where the three-phase power supply is connected to the first current sampling module, the second current sampling module, and the third current sampling module, and the three-phase motor is connected to the output end of the logic determination module.
One or more technical schemes provided in the embodiment of the invention have at least the following beneficial effects: the invention adopts a three-phase motor open-phase monitoring control device and a system thereof based on current sampling, compared with the technical scheme of the prior art, the technical scheme of the invention samples the alternating current flowing through each phase stator of the three-phase motor in real time by adopting a current sampling module, converts the sampled alternating current into alternating voltage by a voltage conversion module, then rectifies the alternating voltage by a rectifying module to obtain voltage waveforms of three direct current components, filters out pulsating alternating current components in the three voltage waveforms by a filtering module to obtain direct current voltage reflecting the amplitude of the current flowing through each phase stator of the three-phase motor, converts the direct current voltage into a digital signal by an analog-digital converter to form three paths of digital bit streams, and finally analyzes the running state of each phase of the three-phase motor according to the response of the three paths of digital bit streams by a logic judgment module, the three-phase motor is in a phase-loss state, and sends out a control signal and triggers an alarm to stop the three-phase motor, and the three-phase motor monitoring system has the characteristics of real-time monitoring, simple structure, strong performance and the like.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural diagram of a three-phase motor open-phase monitoring control device based on current sampling according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a three-phase motor open-phase protection system related to a fuse blowing mechanism provided in the present invention;
FIG. 3 is a schematic structural diagram of a three-phase motor open-phase detection control system related to voltage detection provided by the invention;
fig. 4 is a schematic structural diagram of a three-phase motor open-phase monitoring control system based on current sampling according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
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, left, right, etc., is based on the orientation or positional relationship shown in 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, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If there is a description of the first, second, third and fourth only for the purpose of distinguishing between technical features, this is not to be understood as indicating or implying a 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 otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, in an embodiment of the first aspect of the present invention, a three-phase motor open-phase monitoring and controlling apparatus based on current sampling is provided, including a first current sampling module 100, a first voltage converting module 110, a first rectifying module 120, and a first filtering module 130; the second current sampling module 200, the second voltage converting module 210, the second rectifying module 220, and the second filtering module 230; a third current sampling module 300, a third voltage conversion module 310, a third rectification module 320, a third filtering module 330, and a logic judgment module 400;
the first current sampling module 100, the second current sampling module 200 and the third current sampling module 300 are respectively used for collecting the current of each phase of the three-phase power supply; the first current sampling module 100 is connected to the first filtering module 130 sequentially through the first voltage conversion module 110 and the first rectifying module 120; the second current sampling module 200 is connected to the second filtering module 230 sequentially through the second voltage converting module 210 and the second rectifying module 220; the third current sampling module 300 is connected to the third filtering module 330 sequentially through the third voltage converting module 310 and the third rectifying module 320; the input end of the logic determining module 400 is connected to the first filtering module 130, the second filtering module 230 and the third filtering module 330; the output end of the logic judgment module 400 is used for connecting to a three-phase motor.
The technical scheme at least has the following beneficial effects: compared with the technical scheme in the prior art, the phase-lack monitoring control device for the three-phase motor based on current sampling adopts the current sampling module to collect the phase current of each phase of a three-phase power supply, the current sampling module is connected to the logic judgment module through the voltage conversion module, the rectification module and the filtering module in sequence to monitor the running state of each phase of the three-phase motor, and the fault reason of the three-phase motor is determined according to the result output by the logic judgment module.
Based on the foregoing embodiment, another embodiment of the first aspect of the present invention provides a current sampling-based open-phase monitoring and controlling apparatus for a three-phase motor, where the first current sampling module 100, the second current sampling module 200, and the third current sampling module 300 are respectively configured to sample an ac current flowing through each phase stator of the three-phase motor; by sampling the alternating current flowing through each phase of stator of the three-phase motor in real time, the running state of the three-phase motor at any moment can be accurately monitored;
the first voltage conversion module 110, the second voltage conversion module 210 and the third voltage conversion module 310 are respectively configured to convert the sampled ac current of each phase stator of the three-phase motor into ac voltage; the alternating current signal is converted into an alternating voltage signal so as to further carry out rectification and filtering processing on the sinusoidal voltage waveform;
the first rectifying module 120, the second rectifying module 220, and the third rectifying module 320 are respectively configured to rectify the ac voltage to obtain voltage waveforms of three dc components; after the alternating voltage rectifies the waveform through the rectifying module, a pulsating voltage waveform containing direct current components is formed, and the type of the output signal is voltage;
the first filtering module 130, the second filtering module 230, and the third filtering module 330 are respectively configured to filter pulsating ac components in the three voltage waveforms, output a dc component, and convert the dc component into a digital signal through an analog-to-digital converter to form three paths of digital bit streams; the alternating current components are filtered by the filtering module to obtain three direct current voltages, so that the direct current components are processed by the analog-digital converter, digital signals are formed and then input to the logic judgment module, and further analysis is carried out to determine the running state of the three-phase motor.
The logic determining module 400 is configured to respond to the three digital bit streams to generate a control signal for stopping the operation of the three-phase motor. The logic judgment module is used for processing the three paths of input digital bit streams, sending a control signal according to a processed result, and stopping the three-phase motor when the three-phase motor is in a phase-loss 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, however, the reason for the current increase cannot be determined through the circuit, and when the three-phase motor runs in a phase failure, the intensity of the current increase may not be enough to fuse the fuses, so that the function of protecting the motor cannot be achieved;
referring to fig. 3, three groups of voltage sampling modules are connected in parallel to each phase of branch of the three-phase motor, when a branch corresponding to a certain phase stator of the motor is open-circuited, the voltage sampled by the voltage sampling modules is 0, while the voltages of the other two phases are all kept in a normal state, and the three sampled voltage signals are subjected to certain waveform conversion and then transmitted to the logic judgment module, so that the three-phase motor makes a corresponding response, but the circuit can only detect the open-circuit state before the voltage sampling module is connected to a node, and when the open-circuit state occurs after the voltage sampling node, the voltage sampling modules can still sample the input voltage and cannot accurately detect the running state of the three-phase motor;
the three-phase motor open-phase monitoring control device based on current sampling of the embodiment is characterized in that a current sampling module is connected to each phase branch of a three-phase motor, alternating current flowing through each phase stator of the three-phase motor is sampled in real time through the current sampling module, the sampled alternating current is converted into alternating voltage through a voltage conversion module, then the alternating voltage is rectified through a rectification module to obtain voltage waveforms of three direct current components, then a ripple alternating current component in the three voltage waveforms is filtered through a filtering module to obtain direct current voltage reflecting the amplitude of current flowing through each phase stator of the three-phase motor, the direct current voltage is converted into a digital signal through an analog-digital converter to form three paths of digital bit streams, finally, the running state of each phase of the three-phase motor is analyzed through a logic judgment module according to the response of the three paths of digital bit streams, a control signal is sent out when the three-phase motor is in an open-, the three-phase motor is stopped.
Based on the foregoing embodiment, another embodiment of the first aspect of the present invention provides a current sampling-based open-phase monitoring and controlling apparatus for a three-phase motor, where the first current sampling module 100, the second current sampling module 200, and the third current sampling module 300 are all composed of current transformers. The current transformer is used for sampling the current flowing through each phase of electric wire of the three-phase motor, a pair of currents flowing through the primary coil are subjected to equal-proportion conversion through the current transformer, when the current amplitude of the primary coil is increased, the current flowing through the secondary coil is increased, when the current amplitude of the primary coil is reduced, the current flowing through the secondary coil is reduced, preferably, the current flowing through the secondary coil is reduced in the embodiment, so that the safety of the motor is protected, and the measurement is realized.
Based on the foregoing embodiments, another embodiment of the first aspect of the present invention provides a three-phase motor open-phase monitoring control apparatus based on current sampling, where the first voltage conversion module 110, the second voltage conversion module 210, and the third voltage conversion module 310 are all composed of power resistors. Preferably, in this embodiment, since the current transformer cannot be connected to an excessive load, the resistance on the secondary winding side of the current transformer may be limited by using a power resistor, so as to achieve the effect of protecting the current transformer, and simultaneously, the sampled ac current is converted into a voltage on the secondary winding side for further waveform processing.
Based on the foregoing embodiments, another embodiment of the first aspect of the present invention provides a three-phase motor open-phase monitoring and controlling apparatus based on current sampling, where the first rectifying module 120, the second rectifying module 220, and the third rectifying module 320 are all composed of more than one diode. Performing half-wave or full-wave rectification on an input signal by utilizing the unidirectional conduction characteristic 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. The half-wave rectification uses a diode, and half of the output current signal is present and the other half is absent; the full-wave rectification uses four diodes to convert all waveforms in the alternating current into currents in a single direction, and a filter capacitor is generally added behind a circuit to filter out noise waves after rectification.
Based on the foregoing embodiment, another embodiment of the first aspect of the present invention provides a three-phase motor open-phase monitoring and controlling apparatus based on current sampling, where the first filtering module 130, the second filtering module 230, and the third filtering module 330 all include low-pass filters composed of resistors, capacitors, and inductors. The pulse component in the rectified waveform is filtered by the low-pass filter to obtain the direct-current component, so that the signal is selected according to the frequency, and the interference of a high-frequency signal is avoided.
Based on the foregoing embodiments, according to another embodiment of the first aspect of the present invention, there is provided a three-phase motor open-phase monitoring control device based on current sampling, wherein the logic determining module 400 is configured to respond to three digital bit streams to generate a control signal for stopping the three-phase motor, including triggering an alarm and stopping the three-phase motor. Preferably, in this embodiment, the logic determination module sends out a control signal according to the three-way digital bit stream response, analyzes the operation state of the three-phase motor by using the single chip or the discrete digital device, and triggers an alarm and stops the operation of the three-phase motor when the three-phase motor is in a phase-loss state.
Specifically, signals output by the three filtering modules are digitized through an analog-digital converter to form three paths of digital bit streams, the three paths of digital bit streams are input to a logic judgment module, the logic judgment module analyzes the digital bit difference between any two paths and a reference threshold value, and three results are output in total to determine that the three-phase motor is in a normal operation state, an open circuit state or a phase failure state. When the three-phase motor is in a phase-loss state, the logic judgment module outputs a control signal to stop the three-phase motor from running, triggers an alarm and simultaneously stops sampling the current until the power supply is switched on again.
Based on the foregoing embodiments, another embodiment of the first aspect of the present invention provides a three-phase motor open-phase monitoring control device based on current sampling, further including a signal indicator light connected to the logic determination module 400. Through signal indicator more directly perceivedly acquireing output signal information, observe three phase motor's running state, if in this embodiment, three phase motor is in under the normal condition, signal indicator usually lights, under the phase failure state, signal indicator twinkles. In other embodiments, the signal indicator light can also be set to be different in color, for example, the signal indicator light is green in a normal state and red in a phase-lack state of the three-phase motor.
Referring to fig. 4, an embodiment of the second aspect of the present invention provides a three-phase motor open-phase monitoring control system based on current sampling, including a three-phase power supply 10, a three-phase motor 500, and a three-phase motor open-phase monitoring control device based on current sampling as described in the first aspect, where the three-phase power supply 10 is connected to the first current sampling module 100, the second current sampling module 200, and the third current sampling module 300, and the three-phase motor 500 is connected to an output end of the logic determination module 400.
In this embodiment, since the three-phase motor open-phase monitoring and controlling system based on current sampling is provided with the three-phase motor open-phase monitoring and controlling device based on current sampling in any one of the embodiments, the three-phase motor open-phase monitoring and controlling system based on current sampling in this embodiment has the beneficial effects and functional characteristics brought by the three-phase motor open-phase monitoring and controlling device based on current sampling in any one of the embodiments.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but only protected by the patent laws within the scope of the claims.
Claims (9)
1. The utility model provides a three-phase motor lacks looks monitoring control device based on current sampling which characterized in that: the device comprises a first current sampling module, a first voltage conversion module, a first rectification module and a first filtering module; the second current sampling module, the second voltage conversion module, the second rectification module and the second filtering module; the third current sampling module, the third voltage conversion module, the third rectification module, the third filtering module and the logic judgment module;
the first current sampling module, the second current sampling module and the third current sampling module are respectively used for collecting the current of each phase of the three-phase power supply; the first current sampling module is connected to the first filtering module sequentially through the first voltage conversion module and the first rectifying module; the second current sampling module is connected to the second filtering module sequentially through the second voltage conversion module and the second rectifying module; the third current sampling module is connected to the third filtering module sequentially through the third voltage conversion module and the third rectifying module; the input end of the logic judgment module is connected with the first filtering module, the second filtering module and the third filtering module; and the output end of the logic judgment module is used for being connected to a three-phase motor.
2. The current sampling-based three-phase motor open-phase monitoring and control device as claimed in claim 1, wherein: the first current sampling module, the second current sampling module and the third current sampling module are respectively used for sampling alternating current flowing through each phase of stator of the three-phase motor;
the first voltage conversion module, the second voltage conversion module and the third voltage conversion module are respectively used for converting the sampled alternating current of each phase stator of the three-phase motor into alternating voltage;
the first rectifying module, the second rectifying module and the third rectifying module are respectively used for rectifying the alternating-current voltage to obtain voltage waveforms of three direct-current components;
the first filtering module, the second filtering module and the third filtering module are respectively used for filtering pulsating alternating current components in the three voltage waveforms, outputting direct current components, and converting the direct current components into digital signals through an analog-digital converter to form three paths of digital bit streams;
and the logic judgment module is used for responding and sending out a control signal for stopping the three-phase motor according to the three paths of digital bit streams.
3. The current sampling-based open-phase monitoring and controlling device for the three-phase motor as claimed in claim 1 or 2, wherein: the first current sampling module, the second current sampling module and the third current sampling module are all composed of current transformers.
4. The current sampling-based open-phase monitoring and controlling device for the three-phase motor as claimed in claim 1 or 2, wherein: the first voltage conversion module, the second voltage conversion module and the third voltage conversion module are all composed of power resistors.
5. The current sampling-based open-phase monitoring and controlling device for the three-phase motor as claimed in claim 1 or 2, wherein: the first rectifying module, the second rectifying module and the third rectifying module are all composed of more than one diode.
6. The current sampling-based open-phase monitoring and controlling device for the three-phase motor as claimed in claim 1 or 2, wherein: the first filtering module, the second filtering module and the third filtering module respectively comprise low-pass filters composed of resistors, capacitors and inductors.
7. The current sampling-based three-phase motor open-phase monitoring and control device as claimed in claim 2, wherein: the logic judgment module is used for sending a control signal for stopping the three-phase motor according to the three-path digital bit stream response, and comprises a logic judgment module for triggering an alarm and stopping the three-phase motor.
8. The current sampling-based three-phase motor open-phase monitoring and control device according to claim 7, characterized in that: the logic judgment module is connected with the logic judgment module.
9. The utility model provides a three-phase motor lacks looks monitoring control system based on current sampling which characterized in that: the three-phase motor open-phase monitoring control device based on current sampling comprises a three-phase power supply, a three-phase motor and the three-phase motor open-phase monitoring control device based on current sampling according to any one of claims 1 to 8, wherein the three-phase power supply is connected with the first current sampling module, the second current sampling module and the third current sampling module, and the three-phase motor is connected with the output end of the logic judgment module.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113533828A (en) * | 2021-08-12 | 2021-10-22 | 中车青岛四方机车车辆股份有限公司 | Detection device for power supply circuit of three-phase motor and power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113533828A (en) * | 2021-08-12 | 2021-10-22 | 中车青岛四方机车车辆股份有限公司 | Detection device for power supply circuit of three-phase motor and power supply system |
| CN113533828B (en) * | 2021-08-12 | 2024-05-07 | 中车青岛四方机车车辆股份有限公司 | Detection device and power supply system of power supply circuit of three-phase motor |
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