CN103326322A - Motor voltage protection and control circuit - Google Patents
Motor voltage protection and control circuit Download PDFInfo
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- CN103326322A CN103326322A CN2013102349830A CN201310234983A CN103326322A CN 103326322 A CN103326322 A CN 103326322A CN 2013102349830 A CN2013102349830 A CN 2013102349830A CN 201310234983 A CN201310234983 A CN 201310234983A CN 103326322 A CN103326322 A CN 103326322A
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- voltage
- controller
- relay
- reference voltage
- control circuit
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Abstract
The invention discloses a motor voltage protection and control circuit. A motor control loop is connected with a normally open contact of a voltage relay in series. Three-phase alternating voltage is connected with a controller. The output end of the controller is connected with coils of the voltage relay. A sampling resistor, an A/D switching circuit and a comparer are arranged inside the controller. The three-phase alternating voltage obtained by the sampling resistor is switched by the A/D switching circuit and compared with the comparer, and then a corresponding voltage value is output to the coils of the voltage relay. The motor voltage protection and control circuit can protect motor voltage in many ways, and protects a motor in the work and operation process and in the start process of the motor.
Description
Technical field
The invention discloses a kind of electric moter voltage protection control circuit.
Background technology
Overvoltage protection is when the supply voltage of protected circuit is higher than certain numerical value, and protector cuts off this circuit; When supply voltage returned to normal range (NR), protector was connected automatically.
Under voltage protection is when line voltage distribution is reduced to the voltage that causes motor fatigue, the action of protection electrical equipment.
Overvoltage protection and under-voltage protection are the modal modes of electric motor protecting, and these two kinds of protected modes are generally all separated at present, protect separately, have wasted resource.And when electric motor starting, overvoltage protection and under-voltage protection can not play a role basically.
Summary of the invention
Technical problem to be solved by this invention provides a kind of electric moter voltage protection control circuit, and this control circuit can carry out overvoltage protection and under-voltage protection to motor effectively.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of electric moter voltage protection control circuit, be in series with the voltage relay normally opened contact at motor control loop, three-phase alternating voltage is connected with controller, and the output of described controller is connected with the coil of voltage relay; Described controller inside is provided with sample resistance, A/D change-over circuit and comparator, and the three-phase alternating voltage that sample resistance obtains is exported corresponding magnitude of voltage to the voltage relay coil again with behind the comparator through the conversion of A/D change-over circuit.
Be set with minimum reference voltage and the highest reference voltage in the described comparator, when the voltage of sampling was lower than minimum reference voltage, controller was not exported, and voltage relay is failure to actuate; When the voltage of sampling during greater than minimum reference voltage and less than the highest reference voltage, it is electric that controller output gets the voltage relay coil, the voltage relay action, and normally opened contact is closed; When the voltage of sampling was higher than the highest reference voltage, controller was not exported, and voltage relay is failure to actuate; When the voltage of sampling during less than the highest reference voltage and greater than minimum reference voltage, it is electric that controller output gets the voltage relay coil, the voltage relay action, and normally opened contact is closed.
Control circuit of the present invention can be realized the various protections to electric moter voltage, has not only realized the protection in the machine operation running, and when electric motor starting, also can play a protective role.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is control circuit schematic diagram of the present invention.
Embodiment
As shown in Figure 1, Electric Machine Control comprises major loop and control loop, and major loop is connected to motor by parts such as circuit breaker, KM contactor main contacts, thermal relays, is connected with controller on the major loop bus, and controller output is connected with the voltage relay coil; On the control loop by fuse once connect FR thermal relay normally closed contact, KV voltage relay normally opened contact, button SB1, SB2 and KM contactor coil, SB2 KM contactor in parallel normally opened contact.
Described controller inside is provided with sample resistance, A/D change-over circuit and comparator, and the three-phase alternating voltage that sample resistance obtains is exported corresponding magnitude of voltage to KV voltage relay coil again with behind the comparator through the conversion of A/D change-over circuit.
Under-voltage protection realizes: be set with minimum reference voltage and the highest reference voltage in the comparator, when the voltage of sampling was lower than minimum reference voltage, controller was not exported, and voltage relay is failure to actuate; When the voltage of sampling during greater than minimum reference voltage and less than the highest reference voltage, it is electric that controller output gets the voltage relay coil, the voltage relay action, and normally opened contact is closed.
Overvoltage protection is realized: when the voltage of sampling was higher than the highest reference voltage, controller was not exported, and voltage relay is failure to actuate; When the voltage of sampling during less than the highest reference voltage and greater than minimum reference voltage, it is electric that controller output gets the voltage relay coil, the voltage relay action, and normally opened contact is closed.
When starting, if overvoltage or under-voltage, because the effect of KV voltage relay normally opened contact, this control circuit does not allow electric motor starting yet, makes protection more perfect.
Above-described embodiment does not limit the present invention in any way, and every employing is equal to replaces or technical scheme that the mode of equivalent transformation obtains all drops in protection scope of the present invention.
Claims (2)
1. an electric moter voltage is protected control circuit, and it is characterized in that: be in series with the voltage relay normally opened contact at motor control loop, three-phase alternating voltage is connected with controller, and the output of described controller is connected with the coil of voltage relay; Described controller inside is provided with sample resistance, A/D change-over circuit and comparator, and the three-phase alternating voltage that sample resistance obtains is exported corresponding magnitude of voltage to the voltage relay coil again with behind the comparator through the conversion of A/D change-over circuit.
2. a kind of electric moter voltage according to claim 1 is protected control circuit, it is characterized in that: be set with minimum reference voltage and the highest reference voltage in the described comparator, when the voltage of sampling was lower than minimum reference voltage, controller was not exported, and voltage relay is failure to actuate; When the voltage of sampling during greater than minimum reference voltage and less than the highest reference voltage, it is electric that controller output gets the voltage relay coil, the voltage relay action, and normally opened contact is closed; When the voltage of sampling was higher than the highest reference voltage, controller was not exported, and voltage relay is failure to actuate; When the voltage of sampling during less than the highest reference voltage and greater than minimum reference voltage, it is electric that controller output gets the voltage relay coil, the voltage relay action, and normally opened contact is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102349830A CN103326322A (en) | 2013-06-14 | 2013-06-14 | Motor voltage protection and control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102349830A CN103326322A (en) | 2013-06-14 | 2013-06-14 | Motor voltage protection and control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103326322A true CN103326322A (en) | 2013-09-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102349830A Pending CN103326322A (en) | 2013-06-14 | 2013-06-14 | Motor voltage protection and control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103326322A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786617A (en) * | 2015-11-19 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of motor low voltage protection method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7518838B1 (en) * | 2007-11-15 | 2009-04-14 | Hamilton Sundstrand Corporation | Protection of variable frequency power systems from excessive peak electrical potentials |
| CN101860015A (en) * | 2010-06-29 | 2010-10-13 | 河南省电力公司许昌供电公司 | Phase failure protector of electric motor |
| CN102761095A (en) * | 2011-04-28 | 2012-10-31 | 西门子公司 | Device and method for undervoltage-overvoltage protection |
-
2013
- 2013-06-14 CN CN2013102349830A patent/CN103326322A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7518838B1 (en) * | 2007-11-15 | 2009-04-14 | Hamilton Sundstrand Corporation | Protection of variable frequency power systems from excessive peak electrical potentials |
| CN101860015A (en) * | 2010-06-29 | 2010-10-13 | 河南省电力公司许昌供电公司 | Phase failure protector of electric motor |
| CN102761095A (en) * | 2011-04-28 | 2012-10-31 | 西门子公司 | Device and method for undervoltage-overvoltage protection |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786617A (en) * | 2015-11-19 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of motor low voltage protection method and device |
| CN106786617B (en) * | 2015-11-19 | 2019-04-12 | 中国石油化工股份有限公司 | A kind of motor low voltage protection method and device |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130925 |