CN201490695U - Protector of motor - Google Patents
Protector of motor Download PDFInfo
- Publication number
- CN201490695U CN201490695U CN2009200754997U CN200920075499U CN201490695U CN 201490695 U CN201490695 U CN 201490695U CN 2009200754997 U CN2009200754997 U CN 2009200754997U CN 200920075499 U CN200920075499 U CN 200920075499U CN 201490695 U CN201490695 U CN 201490695U
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- Prior art keywords
- motor
- protector
- microprocessor
- current sense
- output control
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Abstract
The utility model discloses a protector of a motor, which comprises a voltage transformer, a man-machine interface unit, an output control unit, an electric current sense chip, and a microprocessor with an A/D conversion interface, wherein the electric current sense chip and the voltage transformer are respectively connected with the microprocessor through the A/D conversion interface, and the man-machine interface unit and the output control unit are respectively connected with the microprocessor. By adopting the electric current sense chip with lower cost, the protector completes the sampling of an electric current signal on the motor, replaces the voltage transformer with higher cost in the existing protector of the motor, and uses the microprocessor with the A/D conversion interface, thus reducing the cost of the protector by 15%-20% on the premise that the performance is not reduced, simultaneously reducing volume, and leading the protector of the motor to be popularized in more application occasions.
Description
Technical field
The utility model relates to a kind of protector, specifically relates to a kind of protector that is used to protect motor work.
Background technology
Motor is as the nucleus equipment of dragging system, and its use is penetrated into various industries such as comprising petrochemical industry, papermaking, water treatment, steel mill.The GB standard GB/T 124972006 of promulgation in 2006 requires motor to be dragged under the prerequisite that the loaded work piece characteristic requires satisfying, and is safe and reliable, do not influence production.
Middle and high end motor protector on the market adopts threephase current transformer that motor current is sampled substantially, and the signal that samples is carried out the A/D conversion earlier, utilizes microprocessor to calculate again, protects output according to the protective condition that the user sets.The price comparison height of threephase current transformer has so just caused the cost of middle and high end motor protector higher, is not suitable for large batch of popularization and application.
Summary of the invention
The purpose of this utility model is to provide a kind of lower-cost motor protector, uses the current sense chip to replace current transformer, directly carries out the A/D conversion in microprocessor, thereby is implemented under the prerequisite that does not reduce the protector performance, effectively reduces cost.
The technical solution of the utility model is:
A kind of motor protector is provided; comprise voltage transformer; human and machine interface unit and output control unit; also comprise the current sense chip; the microprocessor that has the A/D translation interface; described current sense chip, voltage transformer are connected with microprocessor by the A/D translation interface respectively, and described human and machine interface unit is connected with microprocessor respectively with output control unit.
The beneficial effects of the utility model are:
As above-mentioned structure; motor protector of the present utility model has adopted lower-cost current sense chip to finish the motor current signals sampling; thereby replaced the higher current transformer of cost in the existing motor protector; effectively reduce the cost of motor protector; reduced the volume of protector; and the sampling error of current and voltage signals still can remain on below 1%, has guaranteed that the overall performance of protector does not reduce.
As above-mentioned structure, motor protector of the present utility model adopts the microprocessor that has the A/D translation interface, need not to be provided with separately the A/D conversion chip again, has simplified the structure of protector, has further reduced the protector cost.
As mentioned above, motor protector of the present utility model can make cost reduce 15%-20% under the prerequisite that does not reduce the protector performance, for the user greatly reduces buying expenses, makes motor protector spread to the more applications occasion.
Description of drawings
Fig. 1 is the structural representation of the utility model motor protector one embodiment.
Embodiment
Further specify architectural feature of the present utility model below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of the utility model motor protector one embodiment.As shown in Figure 1; the utility model motor protector; it comprises: voltage transformer 1; human and machine interface unit 2 and output control unit 3; current sense chip 4; the microprocessor 5 that has A/D translation interface 501, described current sense chip 4, voltage transformer 1 are connected with microprocessor 5 by A/D translation interface 501 respectively, and described human and machine interface unit 2 is connected with microprocessor 5 respectively with output control unit 3.
In the present embodiment, the ACS758 family chip that is provided by Allegro company is provided described current sense chip 4, and the ACS758 family chip is based on the height integrated chip of hall sensing, and volume is little, and price is cheaply more a lot of than general current transformer.The sample rate current of ACS758 family chip can reach+/-200A, can satisfy general motor protection demand.
In the present embodiment, the model that is provided by Renesas company is provided is the microcontroller chip of RF21245 to described microprocessor 5.The RF21246 microcontroller chip is microprocessor chip cheaply, and this chip carries the A/D translation interface, can the Direct Sampling analog signal, need not again external A/D conversion chip, and reduced cost.
In the present embodiment, described output control unit 3 is relays, is connected to the 380VAC/5A signal on the relay, according to the guard signal control motor start and stop of microprocessor 5 outputs.
During motor work; the utility model motor protector carries out real-time sampling to the voltage and current of motor respectively by voltage transformer 1 and current sense chip 4; and the voltage and current signal that samples is sent to the A/D translation interface 501 of microprocessor 5; to receive analog signal conversion by A/D translation interface 501 is that digital signal sends microprocessor 5 to; nominal parameter (as: the rated power that microprocessor 5 is provided with by human and machine interface unit 2 according to the user; rated current; rated power; power factor; rated speed) calculates the rated operation point of motor; and according to the voltage and current signal that samples; calculate every actual operation parameters (as: motor line electric current of motor; motor voltage; motor reel power; the malfunction word; power-on time; running time); be presented at human and machine interface unit 2 in real time; if the motor actual operation parameters has exceeded the safe range of predefined nominal parameter in the microprocessor 5; then microprocessor 5 sends the motor protection signal and gives output control unit 3; disconnect motor power, and on human and machine interface unit 2, show fault message.
Claims (2)
1. motor protector; comprise voltage transformer; human and machine interface unit and output control unit; it is characterized in that comprising the current sense chip; the microprocessor that has the A/D translation interface; described current sense chip, voltage transformer are connected with microprocessor by the A/D translation interface respectively, and described human and machine interface unit is connected with microprocessor respectively with output control unit.
2. motor protector as claimed in claim 1 is characterized in that described output control unit is a relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200754997U CN201490695U (en) | 2009-07-29 | 2009-07-29 | Protector of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200754997U CN201490695U (en) | 2009-07-29 | 2009-07-29 | Protector of motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201490695U true CN201490695U (en) | 2010-05-26 |
Family
ID=42429562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200754997U Expired - Fee Related CN201490695U (en) | 2009-07-29 | 2009-07-29 | Protector of motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201490695U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107918100A (en) * | 2017-11-27 | 2018-04-17 | 苏州惠琪特电子科技有限公司 | A kind of small and special electric machine |
-
2009
- 2009-07-29 CN CN2009200754997U patent/CN201490695U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107918100A (en) * | 2017-11-27 | 2018-04-17 | 苏州惠琪特电子科技有限公司 | A kind of small and special electric machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20140729 |
|
| EXPY | Termination of patent right or utility model |