CN204068778U - A kind of motor starter - Google Patents
A kind of motor starter Download PDFInfo
- Publication number
- CN204068778U CN204068778U CN201420455405.XU CN201420455405U CN204068778U CN 204068778 U CN204068778 U CN 204068778U CN 201420455405 U CN201420455405 U CN 201420455405U CN 204068778 U CN204068778 U CN 204068778U
- Authority
- CN
- China
- Prior art keywords
- effect transistor
- convertor
- field
- output end
- thyristor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Motor And Converter Starters (AREA)
Abstract
The utility model discloses a kind of motor starter, described starter comprises bidirectional switch circuit and timing circuit, bidirectional switch circuit comprises AC/DC convertor, thyristor and field-effect transistor, the anode of thyristor is connected to the positive pole of AC/DC convertor DC output end, negative electrode is connected to the negative pole of AC/DC convertor DC output end, control the source electrode that pole is connected to field-effect transistor, the drain electrode of field-effect transistor is connected to the positive pole of AC/DC convertor DC output end, and grid is connected with the triode of timing circuit.Be connected with field-effect transistor by arranging thyristor; can switch element in available protecting bidirectional switch circuit; also motor starter can be made in addition to be applicable to the larger motor of power, the scope of application of increasing motor starter, to improve the practicality of motor starter further.
Description
Technical field
The utility model relates to a kind of motor starter.
Background technology
Usual monopole asynchronous motor includes a main winding and a starting winding, when energising starts, main winding and starting winding have larger current to pass through, when motor speed is increased to after close to synchronous speed, starting winding circuit is turned off or is limited in a less value.Therefore, the starting winding of this kind of motor needs series connection switching circuit, switching circuit conducting when motor starts to be energized, motor speed is increased to and turns off close to switching circuit after synchronous speed, such switching circuit is commonly referred to starting circuit, and the device realizing this function is called starter usually.At present, the main switch element of the starter on market mainly contains mechanical contact, bidirectional triode thyristor and field-effect transistor; When adopting mechanical contact as main switch element, the electric arc of current switching moment can cause main switch element to damage or shorten the life-span; When adopting bidirectional triode thyristor as main switch element, in order to drive bidirectional triode thyristor to need larger drive current, starter power consumption can be caused larger; When adopting field-effect transistor as main switch element, easily generate heat time electric current is large damage main switch element, therefore cannot be applied to the motor that capacity (power) is larger.
Utility model content
The utility model provides a kind of motor starter, be applicable to capacity, motor that power is larger, and the life-span is long, low in energy consumption.
Motor starter described in the utility model, described starter comprises bidirectional switch circuit and timing circuit, bidirectional switch circuit comprises AC/DC convertor, thyristor and field-effect transistor, the anode of thyristor is connected to the positive pole of AC/DC convertor DC output end, negative electrode is connected to the negative pole of AC/DC convertor DC output end, control the source electrode that pole is connected to field-effect transistor, the drain electrode of field-effect transistor is connected to the positive pole of AC/DC convertor DC output end, and grid is connected with the triode of timing circuit.
Motor starter of the present utility model, timing circuit outputs level signals, for controlling the break-make of bidirectional switch circuit, makes bidirectional switch circuit in energising initial stage conducting, turns off after certain delay time.Be provided with thyristor and field-effect transistor at bidirectional switch circuit simultaneously, utilize the power rectifier characteristic of thyristor, only have when applying forward voltage between the anode and negative electrode of thyristor, forward voltage is applied in control pole, thyristor just meeting conducting, effectively can solve motor starter can discharge damage main switch element fast problem at startup moment electric energy, also can prevent because of the excessive damage field-effect transistor of electric current in addition, be connected with field-effect transistor by arranging thyristor, both the characteristic of starter low-power consumption can have been realized, again can switch element in available protecting bidirectional switch circuit, increase the useful life of motor starter, also motor starter can be made in addition to be applicable to the larger motor of power, the scope of application of increasing motor starter.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of motor starter.
Embodiment
A kind of motor starter as shown in Figure 1 comprises bidirectional switch circuit and timing circuit, bidirectional switch circuit comprises AC/DC convertor, thyristor T1 and field-effect transistor T2, the anode of thyristor T1 is connected to the positive pole of AC/DC convertor DC output end, negative electrode is connected to the negative pole of AC/DC convertor DC output end, control the source electrode that pole is connected to field-effect transistor, the drain electrode of field-effect transistor T2 is connected to the positive pole of AC/DC convertor DC output end, and grid is connected with the triode T3 of timing circuit.The first current-limiting resistance is in series with between the positive pole of thyristor and AC/DC convertor DC output end, be in series with the second current-limiting resistance between the drain electrode of field-effect transistor and the positive pole of AC/DC convertor DC output end, the drain electrode of field-effect transistor and gate series have the 3rd current-limiting resistance.Lower at the upper voltage of energising initial stage electric capacity C, the triode T3 not conducting of timing circuit, the output end voltage of timing circuit follows power end, this voltage driven field-effect transistor T2 conducting, when electric capacity C voltage rises to the triode T3 conducting making timing circuit, the output end voltage of timing circuit is dragged down, field-effect transistor T2 transfers shutoff to, in addition, field-effect transistor T2 is also connected with thyristor T1, utilize the power rectifier characteristic of thyristor, only have when applying forward voltage between the anode and negative electrode of thyristor, forward voltage is applied in control pole, thyristor just meeting conducting, effectively can solve motor starter can discharge damage main switch element fast problem at startup moment electric energy, also can prevent because of the excessive damage field-effect transistor of electric current in addition, motor starter is enable to be adapted to the larger motor of power.
In addition, the base stage place of the triode of timing circuit is in series with voltage stabilizing didoe, by arranging voltage stabilizing didoe, resetting voltage can be allowed to be stabilized in certain limit, makes resetting voltage can not be too low, improves the stability of motor starter further.
Claims (4)
1. a motor starter, described starter comprises bidirectional switch circuit and timing circuit, it is characterized in that: bidirectional switch circuit comprises AC/DC convertor, thyristor and field-effect transistor, the anode of thyristor is connected to the positive pole of AC/DC convertor DC output end, negative electrode is connected to the negative pole of AC/DC convertor DC output end, control the source electrode that pole is connected to field-effect transistor, the drain electrode of field-effect transistor is connected to the positive pole of AC/DC convertor DC output end, and grid is connected with the triode of timing circuit.
2. a kind of motor starter according to claim 1, is characterized in that: after the drain series current-limiting resistance of field-effect transistor, be connected to the positive pole of AC/DC convertor DC output end.
3. a kind of motor starter according to claim 1, is characterized in that: the base stage place of the triode of timing circuit is in series with voltage stabilizing didoe.
4. a kind of motor starter according to claim 1, it is characterized in that: between the positive pole of thyristor and AC/DC convertor DC output end, be in series with the first current-limiting resistance, be in series with the second current-limiting resistance between the drain electrode of field-effect transistor and the positive pole of AC/DC convertor DC output end, between the drain electrode of field-effect transistor and grid, be in series with the 3rd current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420455405.XU CN204068778U (en) | 2014-08-13 | 2014-08-13 | A kind of motor starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420455405.XU CN204068778U (en) | 2014-08-13 | 2014-08-13 | A kind of motor starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204068778U true CN204068778U (en) | 2014-12-31 |
Family
ID=52210219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420455405.XU Expired - Lifetime CN204068778U (en) | 2014-08-13 | 2014-08-13 | A kind of motor starter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204068778U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846729A (en) * | 2016-03-28 | 2016-08-10 | 江门市地尔汉宇电器股份有限公司 | Thyristor control circuit used for measuring current control single phase motor |
-
2014
- 2014-08-13 CN CN201420455405.XU patent/CN204068778U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846729A (en) * | 2016-03-28 | 2016-08-10 | 江门市地尔汉宇电器股份有限公司 | Thyristor control circuit used for measuring current control single phase motor |
| CN105846729B (en) * | 2016-03-28 | 2018-05-08 | 江门市地尔汉宇电器股份有限公司 | A kind of thyristor control circuit for measuring current control single-phase motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141231 |