CN202651997U - Unidirectional limit switch - Google Patents
Unidirectional limit switch Download PDFInfo
- Publication number
- CN202651997U CN202651997U CN2012201043405U CN201220104340U CN202651997U CN 202651997 U CN202651997 U CN 202651997U CN 2012201043405 U CN2012201043405 U CN 2012201043405U CN 201220104340 U CN201220104340 U CN 201220104340U CN 202651997 U CN202651997 U CN 202651997U
- Authority
- CN
- China
- Prior art keywords
- diode
- limit switch
- direct current
- motor
- limit
- 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 - Fee Related
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Abstract
The utility model discloses an unidirectional limit switch. Limit switches are comprised. At least one diode and a capacitor are connected in parallel to the limit switches. There are two limit switches which are installed on a positive pole of a direct current motor and a negative pole input terminal. A diode cathode is connected with a positive terminal of the direct current motor. The diode cathode is connected with a negative terminal of the direct current motor. The limit switch of the utility model has the following advantages that: a wire rod is saved so that a complex wiring mode which is generally used to realize positive and negative rotation limit is solved; there is no influence on speed regulation and PWM speed regulation control of the motor is not influenced; a loss is small, an impact of a surge circuit to the diode can be effectively prevented and a service life of the diode is prolonged; and security is high.
Description
[technical field]
The utility model relates to a kind of limit switch, especially a kind of unidirectional limit switch.
[background technology]
In Electric Machine Control, particularly in the direct current machine driving process, often can use limit switch.Usually adopt two interlock relays to realize the motor positive and inverse function in engineering or the design of electronic products process; The level that the spacing general employing chip of the rotating of mechanical part is read the devices such as approach switch or infrared tube judges whether extreme position; Perhaps sometimes adopt another limit method, so that motor is just forwarding extreme position to is out of service, this mode, must manually be adjusted so that the system reset rear motor still can't be switched on so that motor positive and inverse is stopped simultaneously.
[utility model content]
The purpose of this utility model is to solve the deficiency that above-mentioned present technology exists, and a kind of simplicity of design, flexible, the safe and reliable unidirectional limit switch of control are provided.
For achieving the above object, the technical solution of the utility model is: unidirectional limit switch comprises limit switch, a minimum diode in parallel and electric capacity on the described limit switch.
Described limit switch is provided with two, be installed on respectively described direct current machine positive pole and negative input, a diode in parallel and electric capacity on the described limit switch, described direct current machine positive terminal, described diode cathode is connected with described direct current machine positive terminal, described direct current machine negative pole end, described diode cathode is connected with described direct current machine negative pole end.
Described diode is selected IN4007 type germanium diode.
Compared with prior art, the utility model has the following advantages:
(1) saves wire rod: solved the spacing complicated mode of connection of common realization rotating;
(2) speed governing is without impact: this circuit does not affect the PWM speed regulating control of motor;
(3) little loss: even diode self has pressure drop, do not have large electric energy loss yet, the pressure drop loss of diode mainly occurs in that time that the extreme position limit switch is upspring, electric energy loss can be ignored, secondly the electric capacity with diodes in parallel has effectively prevented the impact of surge circuit to diode, prolongs the useful life of diode.
(4) fail safe: in DC MOTOR CONTROL, when control system crashed or program fleet occurs, sensor signal was extracted and was lost efficacy, may be so that mechanical location detects inefficacy; But after adopting this limit circuit, system under any circumstance contingency can not occur and occur; And mechanism can reenter again non-stop zone work behind the system reset.
[description of drawings]
Fig. 1 is the principle schematic of the unidirectional limit switch of the utility model.
[embodiment]
Below in conjunction with the drawings and specific embodiments the utility model is described in detail.
Unidirectional limit switch, as shown in Figure 1, limit switch (C, D) is provided with two, is installed on respectively positive pole and the negative input of described direct current machine F, the upper diode E in parallel of described limit switch (C, D) and electric capacity G.Described direct current machine F positive terminal, described diode E negative electrode is connected with described direct current machine F positive terminal; Described direct current machine F negative pole end, described diode E negative electrode is connected with described direct current machine F negative pole end.Wherein said diode is selected IN4007 type germanium diode.Electric capacity can be to use common electric capacity.
Comprise 2 IN4007 type germanium diode E commonly used in the circuit of the present invention, stir limit switch (C, D) for 2, and 2 electric capacity G consist of the motor positive and inverse limit circuit.The specific works process is as follows: as shown in Figure 1, AB is the DC motor driver wiring point, it is that B is to A that the AB interface connects the DC motor driver output hypothesis sense of current, when being moved to extreme position by motor-driven mechanism main story or forward, touch the C switch, the C switch disconnects, and the outage of motor forward is out of service; But motor can oppositely normally move.When the sense of current is A during to B, motor-driven mechanism is counter-rotating or touches the D switch when oppositely moving to extreme position, and the D switching point is opened, and motor oppositely cuts off the power supply out of service; But motor can normally move by forward.
The above person, it only is this novel preferred embodiment, when the scope that can not limit with this this novel enforcement, the simple equivalence of namely generally doing according to this novel claim and novel description changes and modifies, and all still belongs in the scope that this new patent contains.
Claims (3)
1. unidirectional limit switch comprises limit switch, it is characterized in that: a minimum diode in parallel and electric capacity on the described limit switch.
2. unidirectional limit switch according to claim 1, it is characterized in that: described limit switch is provided with two, is installed on respectively described direct current machine positive pole and negative input, a diode in parallel and electric capacity on the described limit switch; One of them described diode cathode is connected with described direct current machine positive terminal; Another described diode cathode is connected with described direct current machine negative pole end.
3. unidirectional limit switch according to claim 2, it is characterized in that: described diode is selected IN4007 type germanium diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201043405U CN202651997U (en) | 2012-03-16 | 2012-03-16 | Unidirectional limit switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201043405U CN202651997U (en) | 2012-03-16 | 2012-03-16 | Unidirectional limit switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202651997U true CN202651997U (en) | 2013-01-02 |
Family
ID=47421037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201043405U Expired - Fee Related CN202651997U (en) | 2012-03-16 | 2012-03-16 | Unidirectional limit switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202651997U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611252A (en) * | 2012-03-16 | 2012-07-25 | 广州市红鹏直升机遥感科技有限公司 | One-way position limiting switch |
-
2012
- 2012-03-16 CN CN2012201043405U patent/CN202651997U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611252A (en) * | 2012-03-16 | 2012-07-25 | 广州市红鹏直升机遥感科技有限公司 | One-way position limiting switch |
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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: 20130102 Termination date: 20210316 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |