CN202094829U - Sampling device used for motor soft start - Google Patents
Sampling device used for motor soft start Download PDFInfo
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- CN202094829U CN202094829U CN2011202176289U CN201120217628U CN202094829U CN 202094829 U CN202094829 U CN 202094829U CN 2011202176289 U CN2011202176289 U CN 2011202176289U CN 201120217628 U CN201120217628 U CN 201120217628U CN 202094829 U CN202094829 U CN 202094829U
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Abstract
The utility model discloses a sampling device used for the motor soft start. The sampling device includes an AC/DC converter, an A/D conversion circuit, and a control unit. The sampling device calculates a sampled micro voltage-current signal, and then sends a control signal to control the start of a motor. The sampling device also includes a voltage-current conversion unit which is used to convert a three-phase current-voltage signal into a micro current-voltage signal. After the three-phase current-voltage signal is converted into the micro current-voltage signal via the voltage-current conversion unit, the micro current-voltage signal is converted into a direct current signal via the AC/DC converter, and then the direct current signal is converted into a digital single via the A/D converting circuit, and finally the digital single is input in the control unit. The sampling device solves a technical problem that a conventional motor soft start sampling device does not have the current-voltage precise protection, and consequently can not set the protection parameter to a set voltage-current value as required. The sampling device is especially suitable for the motor start in the fields of metallurgy, chemical industry, building, water conservancy, mine, environmental protection, and the like.
Description
Technical field
The utility model belongs to the low-voltage electrical apparatus field, relates in particular to a kind of sampler that is used for soft starter for motor.
Background technology
In the prior art; the soft initiator of motor does not possess the accurate protection of current/voltage; similar current/voltage protection adopts wave band or upper and lower bound that pattern is set; can not to the electric current and voltage value of setting protection be set according to demand; mutual inductor sample resistance current limliting and simulation amplifier, it is perfect inadequately to motor protection.
Chinese patent file CN2595073Y discloses a kind of motor soft starter, and its sampler comprises the three-phase synchrotrans that are connected to the end of incoming cables, the serial connection current transformer.The output of three-phase synchrotrans and current transformer is connected to control module, control module can be sampled to electric current and voltage, and sampled value sent show that module is set to be shown, and reading displayed is provided with the parameter that is provided with of module, carry out demonstration the operational order that module is sent is set, control module outputs a control signal to driver module, and driver module sends drive signal and finally finishes control to threephase asynchronous.This soft initiator is taken a sample to electric current and voltage by transformer and instrument transformer and is entered control module, and it can only be provided with by upper limit lower limit, and it is accurate inadequately to motor protection.
The utility model content
For this reason, technical problem to be solved in the utility model is to provide a kind of soft initiator that can accurately control.
For solving the problems of the technologies described above, the sampler that is used for soft starter for motor of the present utility model, it comprises AC/DC transducer, A/D change-over circuit, and control unit, be used for the micro voltage current signal of sampling is carried out sending control signal and then control electric motor starting after the computing, described sampler also comprises the electric current and voltage converting unit, is used for the three-phase current voltage signal is converted to little current and voltage signals; Be converted to little current and voltage signals after the three-phase current voltage signal process electric current and voltage converting unit, little current and voltage signals is converted to direct current signal through the AC/DC transducer, be converted to digital signal and input to described control unit through the A/D change-over circuit again, thereby finish control electric motor starting.
Described electric current and voltage converting unit comprises the current/voltage transducer, and being connected to AC power is the low-voltage current signal with the three-phase alternating current voltage transitions; And resistor voltage divider circuit, be connected to the current/voltage transducer, being used for the low-voltage current conversion of signals after the conversion of current/voltage transducer is the parameter of control unit demand.
Described sampler also comprises display unit, and its output with described control unit connects, and is used for the data that described control output unit is handled are shown.
Described sampler also comprises parameter set unit, and its input with described control unit connects, and is used to be provided with the protection parameter and inputs to the control output unit.
Technique scheme of the present utility model has the following advantages compared to existing technology:
The current sampling circuit of this soft initiator has been used precision current voltage conversion unit and the sampling of AC/DC change-over circuit; to read the speed calculation of a secondary data in 1 second; be accurate to so that unit of 0.5V is linear and rise or descend; make normal useful life of product more effective protection motor under the prospect that surge current voltage fluctuates widely and overload, overvoltage; under-voltage, the sensitivity of fault self-diagnosis such as the phase failure, overcurrent and defencive function.
Description of drawings
For the easier quilt of content of the present utility model is clearly understood, according to specific embodiment of the utility model also in conjunction with the accompanying drawings, the utility model is described in further detail, wherein below
Fig. 1 is a structure principle chart of the present utility model.
Embodiment
The sampler that is used for soft starter for motor of the present utility model, it comprises AC/DC transducer, A/D change-over circuit, and control unit, be used for the voltage and current signal of sampling is carried out sending control signal and then control electric motor starting after the computing, the control unit of present embodiment is the MCU processor, described sampler also comprises the electric current and voltage converting unit, is used for the three-phase current voltage signal is converted to little current and voltage signals.
Preferably, described electric current and voltage converting unit comprises the current/voltage transducer, and being connected to AC power is the low-voltage current signal with the three-phase alternating current voltage transitions; And resistor voltage divider circuit, be connected to the current/voltage transducer, being used for the low-voltage current conversion of signals after the conversion of current/voltage transducer is the parameter of control unit demand.
This current/voltage transducer is available from Sichuan Mianyang Weibo Electronic Co., Ltd., and the voltage sensor model is PT43B002-1MA/1MA, and the current sensor model is CT43B402-5A/2.5MA.It is to read the speed calculation of a secondary data in 1 second; be accurate to so that unit of 0.5V is linear and rise or descend; from 300-500V/220-380V; each electric current and voltage unit can be provided with protection between the 10-1000A; make normal useful life of product more effective protection motor under the prospect that surge current voltage fluctuates widely and overload, overvoltage; under-voltage, the sensitivity of fault self-diagnosis such as the phase failure, overcurrent and defencive function.
Described sampler also comprises display unit, and its output with described control unit connects, and is used for the data that described control output unit is handled are shown.
Described sampler comprises parameter set unit, and its input with described control unit connects, and is used to be provided with the protection parameter and inputs to the control output unit.
The course of work of this sampler is: major loop three-phase independent voltage electric current obtains 500V/1mA, 5A/2.5mA through the sampling of current/voltage transducer.Sensor sample is obtained after the analog signal by taking out the analog AC signal after the electric resistance partial pressure adjustment, enter the AC/DC transducer and convert the analog DC signal to, be converted to digital signal through A/D again, little current/voltage digital signal of sampling out is delivered to the MCU processor processing, and the various data that the MCU processor processing is good are delivered to liquid crystal display displays.Various protection parameters (as overload, overvoltage, under-voltage, the phase failure, overcurrent etc.) are provided with parameter by LCD and button change are set.The various protected datas of current/voltage are for reference by the control of MCU processor.Saved the operating time of microprocessor, improved the practicality of device, this sampling method has the precision height, and strong interference immunity is saved MCU resource advantage.
Obviously, the foregoing description only is for example clearly is described, and is not the qualification to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all execution modes.And conspicuous variation of being extended out thus or change still are among the protection range of the invention.
Claims (4)
1. sampler that is used for soft starter for motor, it comprises AC/DC transducer, A/D change-over circuit, and control unit, be used for will sampling voltage and current signal carry out sending control signal control electric motor starting after the computing, it is characterized in that:
Described sampler also comprises the electric current and voltage converting unit, is used for the three-phase current voltage signal is converted to little current and voltage signals;
Be converted to little current and voltage signals after the three-phase current voltage signal process electric current and voltage converting unit, little current and voltage signals is converted to direct current signal through the AC/DC transducer, be converted to digital signal and input to described control unit through the A/D change-over circuit again, thereby finish control electric motor starting.
2. the sampler that is used for soft starter for motor according to claim 1 is characterized in that:
Described electric current and voltage converting unit comprises the current/voltage transducer, and being connected to AC power is the low-voltage current signal with the three-phase alternating current voltage transitions;
And resistor voltage divider circuit, be connected to the current/voltage transducer, being used for the low-voltage current conversion of signals after the described current/voltage transducer conversion is the required parameter of described control unit.
3. the sampler that is used for soft starter for motor according to claim 1 and 2 is characterized in that:
Described sampler also comprises display unit, and its output with described control unit connects, and is used for the data that described control unit is handled are shown.
4. the sampler that is used for soft starter for motor according to claim 3 is characterized in that:
Described sampler also comprises parameter set unit, and its input with described control unit connects, and is used to be provided with the protection parameter and inputs to described control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202176289U CN202094829U (en) | 2011-06-24 | 2011-06-24 | Sampling device used for motor soft start |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202176289U CN202094829U (en) | 2011-06-24 | 2011-06-24 | Sampling device used for motor soft start |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202094829U true CN202094829U (en) | 2011-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202176289U Expired - Lifetime CN202094829U (en) | 2011-06-24 | 2011-06-24 | Sampling device used for motor soft start |
Country Status (1)
| Country | Link |
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| CN (1) | CN202094829U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821551A (en) * | 2015-05-08 | 2015-08-05 | 武汉振道世纪科技有限公司 | Intelligent detection protector for three-phase motors |
-
2011
- 2011-06-24 CN CN2011202176289U patent/CN202094829U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821551A (en) * | 2015-05-08 | 2015-08-05 | 武汉振道世纪科技有限公司 | Intelligent detection protector for three-phase motors |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHEJIANG PEOPLE ELECTRICAL APPLIANCE CO., LTD. Free format text: FORMER OWNER: PEOPLE ELECTRICAL APPLIANCES GROUP CO., LTD. Effective date: 20140609 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140609 Address after: 325604, Yueqing, Zhejiang province Liushi town wide industrial zone Patentee after: Zhejiang People Electrical Appliance Co., Ltd. Address before: 325604 No. 555 Station Road, Liushi Town, Zhejiang, Yueqing Patentee before: People Electrical Appliances Group Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20111228 |
|
| CX01 | Expiry of patent term |