CN213846319U - Motor protection device - Google Patents
Motor protection device Download PDFInfo
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- CN213846319U CN213846319U CN202022512270.4U CN202022512270U CN213846319U CN 213846319 U CN213846319 U CN 213846319U CN 202022512270 U CN202022512270 U CN 202022512270U CN 213846319 U CN213846319 U CN 213846319U
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Abstract
A motor protection device comprising: the device comprises a first power supply, a voltage acquisition module, a second power supply and a control module. The first power supply is used for supplying power for the motor and the protection device, and the voltage acquisition module is connected with the first power supply. The second power is connected with the first power, the first power is used for charging the second power, and the second power is used for supplying power to the protection device when the first power is out of power. The control module is connected with the first power supply, the second power supply and the voltage acquisition module. When the power dazzling occurs, the second power supply module supplies power to the control module, the voltage acquisition module acquires the voltage amplitude value of the first power supply within the power dazzling time, and the control module generates a restart instruction based on the comparison between the voltage amplitude value of the power dazzling time and a preset voltage threshold value so as to control the restart of the motor. In the embodiment of the application, the second power supply can immediately supply power to the control module when the power interference occurs, so that the power loss of the control module is avoided, and the motor is rapidly restarted after the first power supply is recovered, so that the use requirement of a user is met.
Description
Technical Field
The utility model relates to an industrial control technical field, in particular to motor protection device.
Background
The instantaneous fluctuation of the voltage of the power grid, commonly known as 'power shaking', can cause the instantaneous voltage loss or undervoltage of an external power supply, and cause the shutdown of a motor in the production process. The power-off time is very short (10 ms-1 min), and when power-off occurs, the motor needs to be restarted through a motor protection device to meet the production requirement.
Typically, when a "brown-out" occurs, the motor takes several hundred milliseconds to restart. And when the power grid is subjected to 'power dazzling', the motor quickly recovers the working state by using the motor protection device, so that the production reliability is also important.
However, when the power failure occurs, the motor protection device is often powered off together, which results in that the motor cannot be restarted quickly, thereby causing the restart time of the motor to be longer, and seriously affecting the continuity of production and the use experience of users.
SUMMERY OF THE UTILITY MODEL
Objects of the invention
The utility model aims at providing a motor protection device can solve the longer problem of motor electricity dazzling restart time.
(II) technical scheme
In order to solve the above problem, according to the utility model discloses an aspect, the utility model provides a motor protection device, including first power, voltage acquisition module, second power and control module. The first power supply is used for supplying power for the motor and the protection device, the voltage acquisition module is connected with the first power supply, and the voltage acquisition module is used for acquiring the voltage amplitude of the first power supply. The second power is connected with the first power, the first power is used for charging the second power, and the second power is used for supplying power for the protection device when the first power is out of power. The control module is connected with the first power supply, the second power supply and the voltage acquisition module and used for controlling the motor to restart according to the voltage amplitude acquired by the voltage acquisition module.
The first power supply is further used for charging the second power supply, when the electric dazzling occurs, the second power supply module supplies power to the control module, the voltage acquisition module acquires the voltage amplitude value within the electric dazzling time of the first power supply, and the control module generates a restart instruction based on comparison between the voltage amplitude value within the electric dazzling time and a preset voltage threshold value so as to control restart of the motor.
Further, the voltage acquisition module is a three-phase voltage acquisition circuit, and the voltage acquisition module is used for acquiring the three-phase voltage amplitude of the first power supply. And in the power-on duration, the control module compares the voltage amplitude of any phase or multiple phases of the first power supply with a preset voltage threshold value to generate the restart instruction.
Further, a power-on time threshold is preset in the control module. If the power-on-interference duration is smaller than the power-on-interference time threshold, the control module generates a first restart instruction indicating immediate restart of the motor based on the power-on-interference duration and the voltage amplitude of the first power supply in the power-on-interference duration.
The motor control device further comprises a detection module which is respectively connected with the control module and the motor, and the detection module is used for detecting the running state of the motor. If the power-on duration is greater than the power-on time threshold, the control module generates a second restart instruction for indicating the restart of the motor based on the power-on duration, the voltage amplitude of the first power supply in the power-on duration and the running state of the motor.
Further, the power supply further comprises a current acquisition module which is respectively connected with the control module and the first power supply, and the current acquisition module is used for acquiring the current value of the first power supply. A current threshold value is preset in the control module, and the control module generates a motor control instruction based on the comparison between the current value acquired by the current acquisition module and the current threshold value so as to control the starting and stopping of the motor.
Furthermore, the current collection module is a three-phase current collection circuit and is used for collecting a three-phase current value of the first power supply. The control module compares a current value of any one phase or multiple phases of the first power supply with a preset current threshold value to generate the motor control instruction.
The motor control device further comprises a display module connected with the control module, and the display module is at least used for displaying information such as the running state of the motor and the voltage amplitude of the first power supply.
The power supply further comprises a storage module connected with the control module, and the storage module is used for storing at least one of the electricity interference duration, the voltage amplitude of the first power supply, the running state of the motor and the like.
The motor protection device further comprises a communication module connected with the control module, and the communication module is used for establishing communication connection between the control module and a remote monitoring device so as to transmit the state information of the motor protection device to the remote monitoring device.
Further, the second power supply is a super capacitor.
(III) advantageous effects
The above technical scheme of the utility model has following profitable technological effect: a motor protection device based on this application embodiment includes first power, voltage acquisition module, second power and control module. The first power supply is used for supplying power for the motor and the protection device, the voltage acquisition module is connected with the first power supply, and the voltage acquisition module is used for acquiring the voltage amplitude of the first power supply. The second power is connected with the first power, the first power is used for charging the second power, and the second power is used for supplying power for the protection device when the first power is out of power. The control module is connected with the first power supply, the second power supply and the voltage acquisition module and used for controlling the motor to restart according to the voltage amplitude acquired by the voltage acquisition module. The first power supply is further used for charging the second power supply, when the electric dazzling occurs, the second power supply module supplies power to the control module, the voltage acquisition module acquires the voltage amplitude value within the electric dazzling time of the first power supply, and the control module generates a restart instruction based on comparison between the voltage amplitude value within the electric dazzling time and a preset voltage threshold value so as to control restart of the motor. In the embodiment of the application, the second power supply can immediately supply power to the control module when the power interference occurs, so that the power loss of the control module is avoided, and the motor is rapidly restarted after the first power supply is recovered, so that the use requirement of a user is met.
Drawings
Fig. 1 is a block diagram of a motor protection device provided by the present invention;
fig. 2 is a block diagram of another motor protection device provided by the present invention.
Reference numerals:
110-a first power supply, 120-a voltage acquisition module, 130-a second power supply, 140-a control module, 150-an output module, 160-a detection module, 170-a current acquisition module, 180-a storage module and 190-a communication module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The present invention will be described in detail with reference to the accompanying drawings and examples.
In one embodiment, as shown in fig. 1, the present invention provides a motor protection device, which includes a first power source 110, a voltage acquisition module 120, a second power source 130, and a control module 140. The first power supply 110 is used to supply the motor and the protection device, and the first power supply 110 may be understood as a power supply network. The voltage collecting module 120 is connected to the first power source 110, and the voltage collecting module 120 is configured to collect a voltage amplitude of the first power source 110. The second power source 130 is connected to the first power source 110, the first power source 110 is used for charging the second power source 130, and the second power source 130 is used for supplying power to the protection device when the first power source 110 loses power. The control module 140 is connected to the first power source 110, the second power source 130 and the voltage collecting module 120, and is configured to control the motor to restart according to the voltage amplitude collected by the voltage collecting module 120.
The first power supply 110 is further configured to charge the second power supply 130, when a power-dazzling occurs, the second power supply 130 supplies power to the control module 140, the voltage acquisition module 120 acquires a voltage amplitude value within a power-dazzling time period of the first power supply 110, and the control module 140 generates a restart instruction based on comparison between the voltage amplitude value within the power-dazzling time period and a preset voltage threshold value, so as to control restart of the motor.
Based on a motor protection device of the embodiment of the present application, the second power supply 130 can immediately supply power to the control module 140 when a power failure occurs, so as to avoid the power loss of the control module 140, and ensure that the motor is rapidly restarted when the first power supply 110 is recovered after the power failure occurs. And because the control module 140 does not lose power when the power dazzling occurs, the motor can be effectively ensured to be restarted in the shortest time, which is beneficial to the normal operation of production and meets the use requirements of users.
As shown in fig. 2, the motor protection device includes an output module 150, and the output module 150 executes a control function according to a control instruction of the control module 140, where the control function includes external operations such as alarm, motor power cut-off, and motor power close. Wherein, the control instruction comprises a restart instruction.
Further, the voltage collecting module 120 is a three-phase voltage collecting circuit, and the voltage collecting module 120 is configured to collect three-phase voltage amplitudes of the first power source 110. During the power-off period, the control module 140 compares the voltage amplitude of any phase or multiple phases of the first power source 110 with a preset voltage threshold to generate a restart instruction. The preset voltage threshold value is 70% of the rated voltage value.
Further, a power-off time threshold is preset in the control module 140, and the power-off time threshold may be 2 s. If the power-on period is less than the power-on time threshold, the control module 140 generates a first restart instruction indicating an immediate restart of the motor based on the power-on period and the voltage amplitude of the first power supply 110 within the power-on period.
When the voltage of any one phase or multiple phases of the voltage of the first power source 110 is lower than a preset voltage threshold, a contactor connected with the motor is tripped, so that the motor stops running.
Specifically, when the above-mentioned power-dazzling phenomenon occurs, the second power supply 130 of the protection device immediately supplies power to the control module 140, and the control module 140 records the power-dazzling time, and generates a first restart instruction indicating an immediate restart of the motor based on the power-dazzling time and the voltage amplitude of the first power supply 110 within the power-dazzling time, so as to control the contactor connected to the motor to be closed at the first time when the first power supply 110 is recovered through the output module 150, so that the motor is restarted and put into operation, thereby ensuring the production continuity. After the power is blocked, the protection device is switched to the first power source 110 without disturbance to supply power, which includes charging the second power source 130.
The protection device further comprises a detection module 160 respectively connected to the control module 140 and the motor, wherein the detection module 160 is used for detecting the operation state of the motor. If the power-on duration is greater than the power-on time threshold, the control module 140 generates a second restart instruction indicating the restart of the motor based on the power-on duration, the voltage amplitude of the first power source 110 within the power-on duration, and the operating state of the motor.
Specifically, the control module 140 immediately controls the contactor connected to the motor to be closed at the first time when the first power source 110 is recovered through the output module 150 based on the second restart instruction, so that the motor is restarted and put into operation, thereby ensuring the production continuity. Or the contactor connected with the motor is controlled to be closed when the first power supply 110 is recovered in a delayed mode, so that the safety of the running environment of the motor is ensured, and the occurrence of accidents is avoided.
In some embodiments, the protection device further comprises a current collection module 170. The current collecting module 170 is respectively connected to the control module 140 and the first power source 110, and the current collecting module 170 is configured to collect a current value of the first power source 110. A current threshold is preset in the control module 140, and the control module 140 generates a motor control instruction based on the comparison between the current value acquired by the current acquisition module 170 and the current threshold, so as to control the start and stop of the motor through the output module 150.
Further, the current collection module 170 is a three-phase current collection circuit, and the current collection module 170 is configured to collect a three-phase current value of the first power source 110. The control module 140 compares the current value of any one or more phases of the first power source 110 with a preset current threshold to generate a motor control command.
The motor protection device can provide an overcurrent quick-break protection function when the motor is started through the current acquisition module 170, and the condition formula of the judgment of the overcurrent quick-break protection is as follows: imax is greater than ISLQ, wherein Imax represents the maximum phase current in three-phase current, ISLQ represents a preset current threshold value, and the preset current threshold value is the overcurrent speed breaking fixed value when the motor is started.
When the motor is started, if any one of the three-phase currents satisfies the conditional expression, the control module 140 outputs a motor control command according to the conditional expression, so that the output module 150 controls a contactor connected with the motor to disconnect the power connection of the motor based on the motor control command, and the motor is controlled to stop running.
In the embodiment of the application, the overcurrent quick-break protection has about 25ms delay when the motor is started so as to avoid transient peak current at the moment of starting, prolong the service life of the motor and improve the service efficiency of the motor.
The motor protection device can provide an overcurrent quick-break protection function when the motor runs, and the overcurrent quick-break protection condition formula when the motor runs is as follows: and Imax is greater than ISL, wherein Imax represents the maximum phase current in the three-phase current, ISL represents a preset current threshold value, and the preset current threshold value is an overcurrent speed breaking fixed value when the motor runs.
When the motor is operated, if any one of the three-phase currents satisfies the conditional expression, the control module 140 outputs a motor control instruction, so that the contactor connected with the motor is controlled by the output module 150 to disconnect the power connection of the motor based on the motor control instruction, and the motor is controlled to stop operating.
In the embodiment of the application, the overcurrent quick-break protection function under the running state of the motor can be provided for the motor through the current collection module 170, the damage to the motor caused by instantaneous overlarge current is prevented, and the service life of the motor can be effectively ensured.
Further, the motor protection device further includes a display module, the display module is connected to the control module 140, and the display module is at least used for displaying the running state of the motor and the voltage amplitude of the first power source 110. The display module can be used for displaying the action of restarting the motor protection device after the motor is in a power-off state, and recording the power-off time and the voltage amplitude. The display module includes, but is not limited to, a touch function, which can modify motor control parameters of the control module 140, including voltage and current of the motor, etc.
In some embodiments, the motor protection apparatus further includes a storage module 180, the storage module 180 is connected to the control module 140, and the storage module 180 is configured to store at least one of the power-on-interference duration, the voltage amplitude of the first power source 110, and the operating state of the motor. The storage module 180 may also store the current value of the first power source 110 collected by the power collecting module. And the motor control parameters modified by the display module are automatically stored in the storage module 180, so that the display module displays the latest motor control parameters when being powered on next time.
In other embodiments, the motor protection device further comprises a communication module 190. The communication module 190 is connected to the control module 140, and the communication module 190 is configured to establish a communication connection between the control module 140 and a remote monitoring device, so as to transmit the state information of the motor protection device to the remote monitoring device.
The second power supply 130 is a super capacitor.
In summary, after the motor protection device is powered on, each module of the motor protection device is powered by the first power source 110, including charging the second power source 130, and when the voltage of the second power source 130 is equal to the voltage of the first power source 110, the first power source 110 automatically stops charging the second power source 130. Meanwhile, the control module 140 performs a self-test procedure, reads various control parameters including motor control parameters from the storage module 180, and outputs a corresponding fault alarm signal if the control parameters are abnormal.
The motor protection device of the embodiment of the application also has a voltage transformer disconnection protection function, and the first power supply 110 comprises a Ua、UbAnd UcPhase voltage, voltage mutual inductorThe judgment condition formula of the disconnection protection is as follows: i Ua,Ub,UcIf | is greater than 8V, the absolute value of any phase voltage of the first power supply 110 is greater than 8V, min (U)a,Ub,Uc) If the voltage is less than 30V, the minimum voltage in the three phases of the first power supply 110 is less than 30V, and the line is judged to be broken; or the voltage transformer switch is in the closed position, max (U)a,Ub,Uc) If the voltage is less than 8V, any phase voltage of the first power supply 110 is less than 8V, and the transformer is judged to be disconnected.
When all the conditions are met, the display module displays the disconnection action of the voltage transformer, and the control module 140 outputs a voltage transformer disconnection fault alarm signal through the output module 150.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A motor protection device, comprising:
the first power supply is used for supplying power to the motor and the protection device;
the voltage acquisition module is connected with the first power supply and is used for acquiring the voltage amplitude of the first power supply;
the second power supply is connected with the first power supply, the first power supply is used for charging the second power supply, and the second power supply is used for supplying power to the protection device when the first power supply loses power;
the control module is connected with the first power supply, the second power supply and the voltage acquisition module and is used for controlling the motor to restart according to the voltage amplitude acquired by the voltage acquisition module;
the first power supply is further used for charging the second power supply, when the power dazzling occurs, the second power supply supplies power to the control module, the voltage acquisition module acquires the voltage amplitude value within the power dazzling duration of the first power supply, and the control module generates a restart instruction based on the comparison between the voltage amplitude value within the power dazzling duration and a preset voltage threshold value so as to control the restart of the motor.
2. The motor protection device of claim 1,
the voltage acquisition module is a three-phase voltage acquisition circuit and is used for acquiring a three-phase voltage amplitude of the first power supply;
and in the power-on duration, the control module compares the voltage amplitude of any phase or multiple phases of the first power supply with a preset voltage threshold value to generate the restart instruction.
3. The motor protection device of claim 2,
a power-shaking time threshold is preset in the control module;
if the power-on-interference duration is smaller than the power-on-interference time threshold, the control module generates a first restart instruction indicating immediate restart of the motor based on the power-on-interference duration and the voltage amplitude of the first power supply in the power-on-interference duration.
4. The motor protection device of claim 3, further comprising:
the detection module is respectively connected with the control module and the motor and is used for detecting the running state of the motor;
if the power-on duration is greater than the power-on time threshold, the control module generates a second restart instruction for indicating the restart of the motor based on the power-on duration, the voltage amplitude of the first power supply in the power-on duration and the running state of the motor.
5. The motor protection device of claim 1, further comprising:
the current acquisition module is respectively connected with the control module and the first power supply and is used for acquiring the current value of the first power supply;
a current threshold value is preset in the control module, and the control module generates a motor control instruction based on the comparison between the current value acquired by the current acquisition module and the current threshold value so as to control the starting and stopping of the motor.
6. The motor protection device of claim 5,
the current acquisition module is a three-phase current acquisition circuit and is used for acquiring a three-phase current value of the first power supply;
the control module compares a current value of any one phase or multiple phases of the first power supply with a preset current threshold value to generate the motor control instruction.
7. The motor protection device of claim 4, further comprising:
and the display module is connected with the control module and is at least used for displaying the running state of the motor and the voltage amplitude information of the first power supply.
8. The motor protection device of claim 7, further comprising:
and the storage module is connected with the control module and is used for storing at least one of the electricity shaking time, the voltage amplitude of the first power supply and the running state information of the motor.
9. The motor protection device of claim 1, further comprising:
and the communication module is connected with the control module and is used for establishing communication connection between the control module and a remote monitoring device so as to transmit the state information of the motor protection device to the remote monitoring device.
10. The motor protection device of claim 1,
the second power supply is a super capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022512270.4U CN213846319U (en) | 2020-11-03 | 2020-11-03 | Motor protection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022512270.4U CN213846319U (en) | 2020-11-03 | 2020-11-03 | Motor protection device |
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| CN213846319U true CN213846319U (en) | 2021-07-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114448076A (en) * | 2020-11-03 | 2022-05-06 | 中科华安科技(淄博)有限公司 | Motor protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114448076A (en) * | 2020-11-03 | 2022-05-06 | 中科华安科技(淄博)有限公司 | Motor protection device |
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